[PATCH] New LaTeX code export option: engraved

[PATCH] New LaTeX code export option: engraved

[Timothy]

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Hi All,

I’ve been fairly busy as of late (hence my recent silence on this ML), however I
have a patchset that’s been in the works for a while that I’ve finally polished
up.

Short version: It adds a new (superior) option for exporting code blocks with
syntax highlighting to LaTeX.

The long version follows.

Currently there are four options for exporting code to LaTeX (ordered by
complexity/quality).
1. Verbatim, which simply includes the code unstyled
2. Custom, which puts the code in an enviroment of your choice
3. Listings, which uses the LaTeX package by this name. This is quick, but
   exceedingly basic.
4. Minted, which uses the LaTeX package by this name. This is slow, but produces
   better results than Listings

This patchset accomplishes two things:
1. It refactors the overly large `org-latex-src-block' function, and makes a few
   other improvements to pre-existing code
2. It adds a new option for exporting code, named (you guessed it!) “engraved”

What is this new option, and why do we want it?

About a year ago I started work on a package that generalises the functionality
of `htmlize.el', termed `engrave-faces'
(<https://elpa.gnu.org/packages/engrave-faces.html>). It provides the ability to
extract font-lock information and export it to a number of formats: html, ansi,
and (crucially) LaTeX! Since the LaTeX export is built on the `fvextra' (LaTeX)
package (like pygments), the vast majority of the Minted options you’re used to
just carry over.

This allows for a result that is, I think, straight up better than all the
pre-existing options. For starters, you can now apply syntax highlighting to any
language you have a major mode for.

There are a number of optimisations unattempted, but it already significantly
outperforms Minted. Here are some timings from my `config.org':

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 LaTeX code backend  Compile time  Overhead  Overhead ratio 
────────────────────────────────────────────────────────────
 verbatim            12 s          0                    0.0 
 lstlistings         15 s          3 s                  0.2 
 Engrave             34 s          22 s                 1.8 
 Pygments (Minted)   184 s         172 s               14.3 
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Compared to Minted, we also no longer have to install `pygments' or pass the
`--shelll-escape' flag to LaTeX to generate passable code blocks.

Having an all-emacs system also allows for some nifty things, like having entire
documents/presentations based on your Emacs theme (see
<https://github.com/tecosaur/ox-chameleon>). Demo images: <https://0x0.st/oAl1.png>,
<https://0x0.st/oAle.png>.

Here are some more screenshots to see what the result can look like in practice:
• <https://0x0.st/oAl2.png>
• <https://0x0.st/oAl_.png>
• <https://0x0.st/oAlL.png>

So, please take a look at the patches, give this a whirl, and let me know what
you think! 😀

All the best,
Timothy

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From 87872cc8f2fb1da1a03dc4aadfbd4af6541d8c13 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 1/4] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..63855d2f6 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info _lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From a4d833418c3e2f0a8f365b92c01c091f75b6482d Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 2/4] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 58 +++++++++++++++++++++++-------------------------
 1 file changed, 28 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 63855d2f6..ed66a51c0 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,34 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase org-lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       org-lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From b322e67cc8b88826be26ee8ae155467aa764e743 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 3/4] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index ed66a51c0..6a29efcba 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From e0310e21e260a930e06d704ec8893ab1e75518aa Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 4/4] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-template, org-latex-listings): Make use of the engraved-faces
package (available on ELPA) to provide an alternative LaTeX code
highlighting backend which functions similarly to htmlize.el for HTML
exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |   9 ++
 lisp/ox-latex.el  | 235 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 241 insertions(+), 3 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..ca1aeafe4 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,15 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (let ((engraved-p (eq org-latex-listings 'engraved))
+           (src-p (org-element-map (plist-get info :parse-tree)
+                      '(src-block inline-src-block) #'identity))
+           (fixedw-p
+            (org-element-map (plist-get info :parse-tree)
+                '(example-block fixed-width) #'identity)))
+       (when (or src-p fixedw-p)
+         (org-latex-generate-engraved-preamble info src-p)))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 6a29efcba..4cc82f6e7 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -946,7 +950,24 @@ (defcustom org-latex-listings nil
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two fancier options for fontification.
+
+The first fancy alternative,
+
+  (setq org-latex-listings \\='engraved)
+
+causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second fancy alternative,
 
   (setq org-latex-listings \\='minted)
 
@@ -971,8 +992,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1164,109 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\providecolor{codebackground}{HTML}{f7f7f7}
+\\providecolor{codeborder}{HTML}{f0f0f0}
+\\providecolor{EFD}{HTML}{28292e}
+
+% TODO have code boxes keep line vertical alignment
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=codebackground, colframe=codeborder,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be, as long as it:
+- Loads the fvextra package.
+- Defines a \"Code\" environment (note the capital C), which can be
+  later used to wrap \"Verbatim\" environments (provided by fvextra).
+
+A macro-like placeholder is used to set fvextra's defaults according to
+`org-latex-engraved-options':
+
+  [FVEXTRA-SETUP]"
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC")
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble-template
+          (plist-get info :latex-engraved-preamble))
+         (engraved-preamble
+          (if (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?"
+                            org-latex-engraved-preamble)
+              (replace-match
+               (concat
+                "\\fvset{%\n  "
+                (org-latex--make-option-string engraved-options ",\n  ")
+                "}\n")
+               t t
+               engraved-preamble-template)
+            engraved-preamble-template)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1881,15 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (let ((engraved-p (eq org-latex-listings 'engraved))
+           (src-p (org-element-map (plist-get info :parse-tree)
+                      '(src-block inline-src-block) #'identity))
+           (fixedw-p
+            (org-element-map (plist-get info :parse-tree)
+                '(example-block fixed-width) #'identity)))
+       (when (or src-p fixedw-p)
+         (org-latex-generate-engraved-preamble info src-p)))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,12 +2276,13 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
   (let ((mint-lang (or (cadr (assq (intern lang)
                                    (plist-get info :latex-minted-langs)))
-                       (downcase org-lang)))
+                       (downcase lang)))
         (options (org-latex--make-option-string
                   (plist-get info :latex-minted-options))))
     (format "\\mintinline%s{%s}{%s}"
@@ -2155,6 +2290,23 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (info code lang)
+  (if (require 'engrave-faces-latex nil t)
+      (let (engraved-buffer engraved-code)
+        (setq engraved-buffer
+              (with-temp-buffer
+                (insert code)
+                (funcall (org-src-get-lang-mode lang))
+                (engrave-faces-latex-buffer)))
+        (setq engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string)))
+        (kill-buffer engraved-buffer)
+        (format "\\Verb{%s}"
+                engraved-code))
+    (message "Cannot engrave inline src block, `engrave-faces-latex' is unavailible.")
+    (insert (org-latex--text-markup code 'code info))))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   (let* ((lst-lang (or (cadr (assq (intern lang)
                                    (plist-get info :latex-listings-langs)))
@@ -3013,6 +3165,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3129,6 +3284,80 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content-buffer
+          (with-temp-buffer
+            (insert
+             (let* ((code-info (org-export-unravel-code src-block))
+                    (max-width
+                     (apply 'max
+                            (mapcar 'length
+                                    (org-split-string (car code-info)
+                                                      "\n")))))
+               (org-export-format-code
+                (car code-info)
+                (lambda (loc _num ref)
+                  (concat
+                   loc
+                   (when ref
+                     ;; Ensure references are flushed to the right,
+                     ;; separated with 6 spaces from the widest line
+                     ;; of code.
+                     (concat (make-string (+ (- max-width (length loc)) 6)
+                                          ?\s)
+                             (format "(%s)" ref)))))
+                nil (and retain-labels (cdr code-info)))))
+            (funcall (org-src-get-lang-mode lang))
+            (engrave-faces-latex-buffer)))
+         (content
+          (with-current-buffer content-buffer
+            (buffer-string)))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           content)))
+    (kill-buffer content-buffer)
+    ;; Return value.
+    (format float-env body))
+  (message "Cannot engrave src block, `engrave-faces-latex' is unavailible.")
+  (insert (org-latex--text-markup code 'code info))))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3

Re: [PATCH] New LaTeX code export option: engraved

[Daniel Fleischer]

Timothy [2022-05-04 Wed 23:59] wrote:

> I’ve been fairly busy as of late (hence my recent silence on this ML), however I have a patchset that’s been in the
> works for a while that I’ve finally polished up. 

Hi Timothy, thank you very much for your work!

Let me learn a bit about the different code highlighting options in
order to understand what you offer.

Best,

-- 

Daniel Fleischer

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

[-- Attachment #1: Type: text/plain, Size: 336 bytes --]

Hi Daniel,

> Hi Timothy, thank you very much for your work!

Thanks for the kind words 🙂

> Let me learn a bit about the different code highlighting options in
> order to understand what you offer.

Sure. If it’s any help, here’s a comparison example I whipped up:
<https://0x0.st/oAdn.png>

All the best,
Timothy

Re: [PATCH] New LaTeX code export option: engraved

[Ihor Radchenko]

Timothy <tecosaur@gmail.com> writes:

>> Let me learn a bit about the different code highlighting options in
>> order to understand what you offer.
>
> Sure. If it’s any help, here’s a comparison example I whipped up:
> <https://0x0.st/oAdn.png>

Timothy, could you please not use 0x0 to share not-so-large images? 0x0
deletes uploaded files within ~1year time and this link will no longer
be valid if someone tries to read this discussion years later.

Also, this illustration makes me wonder if engrave-faces can provide a
color scheme that is mimicking minted. Generally, easy customisation of
highlight schemes could be useful. On per-src-block basis or even on
per-language basis if document contains course blocks with different
programming languages.

Best,
Ihor

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

[-- Attachment #1: Type: text/plain, Size: 1407 bytes --]

Hi Ihor,

>> Sure. If it’s any help, here’s a comparison example I whipped up:
>> <https://0x0.st/oAdn.png>
>
> Timothy, could you please not use 0x0 to share not-so-large images? 0x0
> deletes uploaded files within ~1year time and this link will no longer
> be valid if someone tries to read this discussion years later.

I forget if org-msg handles image links well (I recall some issue in the past).
Let’s do a little test:
<file:/tmp/ox-latex-src-fontification-comparison.png>

> Also, this illustration makes me wonder if engrave-faces can provide a
> color scheme that is mimicking minted.

One could certainly create `engrave-faces-preset-styles' presets which mimic
certain minted colour schemes.

> Generally, easy customisation of highlight schemes could be useful.

I agree. Is this not already the case though? Manually modifying
`engrave-faces-preset-styles' or calling `engrave-faces-generate-preset' seems
pretty easy to me, the only thing missing is the ability to generate a preset
from a theme not loaded, which I suspect won’t be easy to do.

> On per-src-block basis or even on per-language basis if document contains
> course blocks with different programming languages.

I can’t say I really see the point in this myself. It would certainly be
non-trivial to add, but could be added latter if there’s demand for it.

All the best,
Timothy

[-- Attachment #2: ox-latex-src-fontification-comparison.png --]
[-- Type: image/png, Size: 476505 bytes --]

Re: [PATCH] New LaTeX code export option: engraved

[Daniel Fleischer]

Timothy [2022-05-04 Wed 23:59] wrote:

> I’ve been fairly busy as of late (hence my recent silence on this ML), however I have a patchset that’s been in the
> works for a while that I’ve finally polished up. 

Hi Timothy, thank you very much for your work!

Let me learn a bit about the different code highlighting options in
order to understand what you offer.

Best,

-- 

Daniel Fleischer

Re: [PATCH] New LaTeX code export option: engraved

[Ihor Radchenko]

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Timothy <tecosaur@gmail.com> writes:

> This patchset accomplishes two things:
> 1. It refactors the overly large `org-latex-src-block' function, and makes a few
>    other improvements to pre-existing code
> 2. It adds a new option for exporting code, named (you guessed it!) “engraved”
>
> What is this new option, and why do we want it?
>
> About a year ago I started work on a package that generalises the functionality
> of `htmlize.el', termed `engrave-faces'
> (<https://elpa.gnu.org/packages/engrave-faces.html>). It provides the ability to
> extract font-lock information and export it to a number of formats: html, ansi,
> and (crucially) LaTeX! Since the LaTeX export is built on the `fvextra' (LaTeX)
> package (like pygments), the vast majority of the Minted options you’re used to
> just carry over.
>
> This allows for a result that is, I think, straight up better than all the
> pre-existing options. For starters, you can now apply syntax highlighting to any
> language you have a major mode for.

Thanks!
Implementing fontification using Emacs capabilities is certainly a step
in the right direction. LaTeX support for fontification has always been
tricky.

Some comments:

- I tried to test your patch, and it only works partially. There is some
  stray text caused by LaTeX errors:

[-- Attachment #2: test.org --]
[-- Type: application/vnd.lotus-organizer, Size: 396 bytes --]

#+STARTUP: indent
Enable soft indent mode
**** Header Level 4
The text belonging to level-4 header
*************** Inline Task
Text belonging to inline task
*************** END
#+caption: This is caption
#+begin_src emacs-lisp
  (message "Hello world and very very very long line afterwards lakjsdlk sjsaldjkjsa ldjalskdjalsjdlalds jalskdjalsjdlas kdjalsdjlsjdals djasdjasljdasljdslj")
#+end_src

[-- Attachment #3: test.pdf --]
[-- Type: application/pdf, Size: 93821 bytes --]

[-- Attachment #4: Type: text/plain, Size: 2329 bytes --]


- You did not add a NEWS entry and did not update the manual in your patch.
- There are many compiler warnings emitted when compiling Org with your patch

> +(defun org-latex-inline-src-block--minted (info code lang)
> +  (let ((mint-lang (or (cadr (assq (intern lang)
> +
> +(defun org-latex-inline-src-block--listings (info code lang)
> +  (let* ((lst-lang (or (cadr (assq (intern lang)

The docstrings are missing in the above.

> -Alternatively,
> +There are two fancier options for fontification.
> +
> +The first fancy alternative,

I am not sure why, but the word fancy feels slightly annoying here.

> +
> +The styling of the engraved result can customised with
> +`org-latex-engraved-preamble' and `org-latex-engraved-options'.
> +The default preamble also uses the tcolorbox LaTeX package in
> +addition to fvextra.

Since engraved is not entirely relying on LaTeX options, a lot of
customisation is not mentioned in this docstring. AFAIU, color
customisation is only possible by changing defcustoms from engrave-faces
package.

Another related note is what is going to happen in beamer export with
dark background. The default face mapping in engrave-faces is using some
kind of light theme, which may lose all the contrast on not-light
background.

> +\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
> +
> +\\providecolor{codebackground}{HTML}{f7f7f7}
> +\\providecolor{codeborder}{HTML}{f0f0f0}
> +\\providecolor{EFD}{HTML}{28292e}

> +(defcustom org-latex-engraved-options
> +  '(("commandchars" . "\\\\\\{\\}")
> +    ("highlightcolor" . "white!95!black!80!blue")
> +    ("breaklines" . "true")
> +    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
> +  "Association list of options for the latex fvextra package when engraving code.

It feels that codebackground, codeborder, and EFD should be customizable
by org-latex-engraved-options.

> +(defun org-latex-generate-engraved-preamble (info syntax-colours-p)

Docstring?

> +(defun org-latex-inline-src-block--engraved (info code lang)
> +  (if (require 'engrave-faces-latex nil t)
> ...
> +    (message "Cannot engrave inline src block, `engrave-faces-latex' is unavailible.")
> +    (insert (org-latex--text-markup code 'code info))))

Why message instead of error?

Best,
Ihor

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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Hi Ihor,

> Thanks!
> Implementing fontification using Emacs capabilities is certainly a step
> in the right direction. LaTeX support for fontification has always been
> tricky.

I’m glad to hear you’re of a similar mind to me with this.

> - I tried to test your patch, and it only works partially. There is some
>   stray text caused by LaTeX errors:
>
> [2. application/vnd.lotus-organizer; test.org]…
> [3. application/pdf; test.pdf]…

Ah. I thought that hyperref loaded xcolor, but it seems my assumption was
incorrect. I’ve added `\usepackage{xcolor}' to the default
`org-latex-engraved-preamble', but maybe I should ask people to modify
`org-latex-packages-alist'. I’m not sure.

> - You did not add a NEWS entry and did not update the manual in your patch.

I’m waiting till the functional content of these packages is settled/accepted,
and then I’ll write NEWS and manual entries.

> - There are many compiler warnings emitted when compiling Org with your patch

Oops, I keep on forgetting to check byte compilation. These should all be fixed now.

> The docstrings are missing in the above.

Docstrings have been added.

> I am not sure why, but the word fancy feels slightly annoying here.

Docsting rewritten.

> Since engraved is not entirely relying on LaTeX options, a lot of
> customisation is not mentioned in this docstring. AFAIU, color
> customisation is only possible by changing defcustoms from engrave-faces
> package.
>
> Another related note is what is going to happen in beamer export with
> dark background. The default face mapping in engrave-faces is using some
> kind of light theme, which may lose all the contrast on not-light
> background.

Modifying the style of engraved-faces-latex’s output is indeed done by
customising a engraved-faces variable. I don’t think we should attempt to do
anything further with this within Org.

To elaborate a bit, the generated LaTeX uses the styling information given in
`engrave-faces-preset-styles'. Changing this to use the current Emacs theme is as
simple as `(setq engrave-faces-preset-styles (engrave-faces-generate-preset))'.

> It feels that codebackground, codeborder, and EFD should be customizable
> by org-latex-engraved-options.

Hmm. I don’t think so. They are entirely self-contained within the preamble
variable. Should there be a nice existing `org-latex-user-colors' variable or
such, it would make a lot of sense to shove this there, but since no such
variable exists I’m not sure we can really do much better than just asking users
to modify `org-latex-engraved-preamble'.

> Docstring?

Added.

>> +    (message “Cannot engrave inline src block, `engrave-faces-latex’ is unavailible.”)
>
> Why message instead of error?

User errors are now thrown.

Thanks for the feedback!
Timothy

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From d231437e2c9f96bf70520d9ddda810a95667fcdd Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 1/4] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..c2f728a1c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From ea5d116b06326be46e3053e6ded26d5b8b0638d9 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 2/4] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 62 +++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index c2f728a1c..2b732cf16 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,38 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using minted.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase org-lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From aa0a9dafab7a7246e2855a2257d4c156eb48752c Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 3/4] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2b732cf16..4181db175 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From 90849f3986cc709c1d01ec9f204a7eb8b940cd27 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 4/4] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-template, org-latex-listings): Make use of the engraved-faces
package (available on ELPA) to provide an alternative LaTeX code
highlighting backend which functions similarly to htmlize.el for HTML
exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |   9 ++
 lisp/ox-latex.el  | 273 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 272 insertions(+), 10 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..73bd95539 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,15 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 4181db175..831509a26 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two options for more comprehensive fontification. The
+first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be used with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,124 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+\\providecolor{codebackground}{HTML}{f7f7f7}
+\\providecolor{codeborder}{HTML}{f0f0f0}
+\\providecolor{EFD}{HTML}{28292e}
+
+% TODO have code boxes keep line vertical alignment
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=codebackground, colframe=codeborder,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be, as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loader elsewhere).
+- Defines a \"Code\" environment (note the capital C), which can be
+  later used to wrap \"Verbatim\" environments (provided by fvextra).
+
+A macro-like placeholder is used to set fvextra's defaults according to
+`org-latex-engraved-options':
+
+  [FVEXTRA-SETUP]
+
+In the default value the color \"EFD\" is provided as this is the
+foreground colour provided by engrave-faces-latex.  When there
+are example/fixed-width blocks only, the engraved generated
+preamble is not included, and so it is provided so we may use it
+anyway."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from `org-latex-engraved-preamble' and
+`org-latex-engraved-options'."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble-template
+          (plist-get info :latex-engraved-preamble))
+         (engraved-preamble
+          (if (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?"
+                            engraved-preamble)
+              (replace-match
+               (concat
+                "\\fvset{%\n  "
+                (org-latex--make-option-string engraved-options ",\n  ")
+                "}\n")
+               t t
+               engraved-preamble-template)
+            engraved-preamble-template)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1905,15 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2300,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2149,7 +2308,7 @@ (defun org-latex-inline-src-block--minted (info code lang)
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
   (let ((mint-lang (or (cadr (assq (intern lang)
                                    (plist-get info :latex-minted-langs)))
-                       (downcase org-lang)))
+                       (downcase lang)))
         (options (org-latex--make-option-string
                   (plist-get info :latex-minted-options))))
     (format "\\mintinline%s{%s}{%s}"
@@ -2157,6 +2316,24 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+      (let (engraved-buffer engraved-code)
+        (setq engraved-buffer
+              (with-temp-buffer
+                (insert code)
+                (funcall (org-src-get-lang-mode lang))
+                (engrave-faces-latex-buffer)))
+        (setq engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string)))
+        (kill-buffer engraved-buffer)
+        (format "\\Verb{%s}"
+                engraved-code))
+    (user-error "Cannot engrave inline src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -3017,6 +3194,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3313,79 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content-buffer
+          (with-temp-buffer
+            (insert
+             (let* ((code-info (org-export-unravel-code src-block))
+                    (max-width
+                     (apply 'max
+                            (mapcar 'length
+                                    (org-split-string (car code-info)
+                                                      "\n")))))
+               (org-export-format-code
+                (car code-info)
+                (lambda (loc _num ref)
+                  (concat
+                   loc
+                   (when ref
+                     ;; Ensure references are flushed to the right,
+                     ;; separated with 6 spaces from the widest line
+                     ;; of code.
+                     (concat (make-string (+ (- max-width (length loc)) 6)
+                                          ?\s)
+                             (format "(%s)" ref)))))
+                nil (and retain-labels (cdr code-info)))))
+            (funcall (org-src-get-lang-mode lang))
+            (engrave-faces-latex-buffer)))
+         (content
+          (with-current-buffer content-buffer
+            (buffer-string)))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           content)))
+    (kill-buffer content-buffer)
+    ;; Return value.
+    (format float-env body))
+  (user-error "Cannot engrave src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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> [5. text/x-patch; 0004-ox-latex-Introduce-engraved-code-highlighting.patch]…

Ooops, I had some ucommited changes. The correct version is attached.

Timothy

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From b66c291b1f0d1419742449bcde42bf0c4d620c23 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-template, org-latex-listings): Make use of the engraved-faces
package (available on ELPA) to provide an alternative LaTeX code
highlighting backend which functions similarly to htmlize.el for HTML
exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |   9 ++
 lisp/ox-latex.el  | 273 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 272 insertions(+), 10 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..73bd95539 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,15 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 4181db175..83bb6f078 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two options for more comprehensive fontification. The
+first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be used with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,124 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+\\providecolor{codebackground}{HTML}{f7f7f7}
+\\providecolor{codeborder}{HTML}{f0f0f0}
+\\providecolor{EFD}{HTML}{28292e}
+
+% TODO have code boxes keep line vertical alignment
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=codebackground, colframe=codeborder,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be, as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loader elsewhere).
+- Defines a \"Code\" environment (note the capital C), which can be
+  later used to wrap \"Verbatim\" environments (provided by fvextra).
+
+A macro-like placeholder is used to set fvextra's defaults according to
+`org-latex-engraved-options':
+
+  [FVEXTRA-SETUP]
+
+In the default value the color \"EFD\" is provided as this is the
+foreground colour provided by engrave-faces-latex.  When there
+are example/fixed-width blocks only, the engraved generated
+preamble is not included, and so it is provided so we may use it
+anyway."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from `org-latex-engraved-preamble' and
+`org-latex-engraved-options'."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble-template
+          (plist-get info :latex-engraved-preamble))
+         (engraved-preamble
+          (if (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?"
+                            engraved-preamble-template)
+              (replace-match
+               (concat
+                "\\fvset{%\n  "
+                (org-latex--make-option-string engraved-options ",\n  ")
+                "}\n")
+               t t
+               engraved-preamble-template)
+            engraved-preamble-template)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1905,15 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2300,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2149,7 +2308,7 @@ (defun org-latex-inline-src-block--minted (info code lang)
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
   (let ((mint-lang (or (cadr (assq (intern lang)
                                    (plist-get info :latex-minted-langs)))
-                       (downcase org-lang)))
+                       (downcase lang)))
         (options (org-latex--make-option-string
                   (plist-get info :latex-minted-options))))
     (format "\\mintinline%s{%s}{%s}"
@@ -2157,6 +2316,24 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (_info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+      (let (engraved-buffer engraved-code)
+        (setq engraved-buffer
+              (with-temp-buffer
+                (insert code)
+                (funcall (org-src-get-lang-mode lang))
+                (engrave-faces-latex-buffer)))
+        (setq engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string)))
+        (kill-buffer engraved-buffer)
+        (format "\\Verb{%s}"
+                engraved-code))
+    (user-error "Cannot engrave inline src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -3017,6 +3194,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3313,79 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content-buffer
+          (with-temp-buffer
+            (insert
+             (let* ((code-info (org-export-unravel-code src-block))
+                    (max-width
+                     (apply 'max
+                            (mapcar 'length
+                                    (org-split-string (car code-info)
+                                                      "\n")))))
+               (org-export-format-code
+                (car code-info)
+                (lambda (loc _num ref)
+                  (concat
+                   loc
+                   (when ref
+                     ;; Ensure references are flushed to the right,
+                     ;; separated with 6 spaces from the widest line
+                     ;; of code.
+                     (concat (make-string (+ (- max-width (length loc)) 6)
+                                          ?\s)
+                             (format "(%s)" ref)))))
+                nil (and retain-labels (cdr code-info)))))
+            (funcall (org-src-get-lang-mode lang))
+            (engrave-faces-latex-buffer)))
+         (content
+          (with-current-buffer content-buffer
+            (buffer-string)))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           content)))
+    (kill-buffer content-buffer)
+    ;; Return value.
+    (format float-env body))
+  (user-error "Cannot engrave src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3

Re: [PATCH] New LaTeX code export option: engraved

[Ihor Radchenko]

Timothy <tecosaur@gmail.com> writes:

Thanks for the updated patch! See some more comments below.

> +The first two options provide basic syntax
> +highlighting (listings), or none at all (verbatim).
> ...
> -Alternatively,
> +There are two options for more comprehensive fontification. The
> +first can be set with,

Maybe "The other two options"? Also, using first/second here is a bit
confusing because: (1) they are actually 3/4 in the above list; (2)
engraved is listed last.

> +The second more comprehensive option can be used with,

*can be set with

> -causes source code to be exported using the minted package as
> -opposed to listings.  If you want to use minted, you need to add
> -the minted package to `org-latex-packages-alist', for example
> +which causes source code to be exported using the minted package
> +as opposed to listings.  If you want to use minted, you need to
> +add the minted package to `org-latex-packages-alist', for example
>  using customize, or with

I feel slightly confused about using the word "package" here. Which one
refers to LaTeX package and which one to Emacs? I would state "Emacs
package" explicitly to highlight contrast with "LaTeX package".
  
> +(defcustom org-latex-engraved-preamble
> +  "\\usepackage{fvextra}
> +
> +[FVEXTRA-SETUP]
> +
> +\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}

I'd like to see a comment on what it does.

> +\\usepackage{xcolor}
> +
> +\\providecolor{codebackground}{HTML}{f7f7f7}
> +\\providecolor{codeborder}{HTML}{f0f0f0}
> +\\providecolor{EFD}{HTML}{28292e}
> +
> +% TODO have code boxes keep line vertical alignment
> +\\usepackage[breakable,xparse]{tcolorbox}
> +\\DeclareTColorBox[]{Code}{o}%

Same request to provide a comment. Also, what it that % TODO doing
there? It is confusing.

Also, it is unclear what the [breakable,xparse] options to tcolorbox are
doing there and what will happen if the user removes them.

Further, I am wondering what is going to happen if the user happens to
have tcolorbox without options loaded via org-latex-packages-alist.

> +There is quite a lot of flexibility in what this preamble can be, as long as it:
> +- Loads the fvextra package.
> +- Loads the package xcolor (if it is not already loader elsewhere).
> +- Defines a \"Code\" environment (note the capital C), which can be
> +  later used to wrap \"Verbatim\" environments (provided by fvextra).

The last point is not very clear. What kind of environment?

> +(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
> +  "Generate the preamble to setup engraved code.
> +The result is constructed from `org-latex-engraved-preamble' and
> +`org-latex-engraved-options'."

This is relying on

(:latex-engraved-options nil nil org-latex-engraved-options)
(:latex-engraved-preamble nil nil org-latex-engraved-preamble)

If it changes any time in future (e.g. to allow per-file settings), the
docstring may be overlooked. 

> +       (let ((src-p (org-element-map (plist-get info :parse-tree)
> +                        '(src-block inline-src-block) #'identity))
> +             (fixedw-p
> +              (org-element-map (plist-get info :parse-tree)
> +                  '(example-block fixed-width) #'identity)))

I'd use FIRST-MATCH argument for org-element-map. It will be slightly
faster on large buffers.

> -                       (downcase org-lang)))
> +                       (downcase lang)))

I am not sure if this belongs to this patch. Please double check.

> +                            (mapcar 'length
> +                                    (org-split-string (car code-info)
> +                                                      "\n")))))

I am not sure how well it will work with e.g. Chinese characters in comments.

Best,
Ihor

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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Hi Ihor,

Find attached an updated patchset, and comments below :)

Ihor Radchenko <yantar92@gmail.com> writes:

> Maybe “The other two options”? Also, using first/second here is a bit
> confusing because: (1) they are actually 3/4 in the above list; (2)
> engraved is listed last.

Docstring changed.

>> +The second more comprehensive option can be used with,
>
> *can be set with

Changed.

> I feel slightly confused about using the word “package” here. Which one
> refers to LaTeX package and which one to Emacs? I would state “Emacs
> package” explicitly to highlight contrast with “LaTeX package”.

Clarifications added to the docstring.

>> +\\{\\\FancyVerbLine}
>
> I’d like to see a comment on what it does.

Added.

> Same request to provide a comment. Also, what it that % TODO doing
> there? It is confusing.

A comment has been added, and the TODO removed.

> Also, it is unclear what the [breakable,xparse] options to tcolorbox are
> doing there and what will happen if the user removes them.

“breakable” allows the box to be broken across pages, and “xparse” provides
`\DeclareTColorBox'.

> Further, I am wondering what is going to happen if the user happens to
> have tcolorbox without options loaded via org-latex-packages-alist.

They could see: ERROR: LaTeX Error: Option clash for package tcolorbox.

They would need to tweak such a tcolorbox entry to include the options used
here.

>> +There is quite a lot of flexibility in what this preamble can be, as long as it:
>> +- Loads the fvextra package.
>> +- Loads the package xcolor (if it is not already loader elsewhere).
>> +- Defines a \“Code\” environment (note the capital C), which can be
>> +  later used to wrap \“Verbatim\” environments (provided by fvextra).
>
> The last point is not very clear. What kind of environment?

Anything that the user wants to do to modify the display of the generated
`Verbatim' environment.

>> +(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
>> +  “Generate the preamble to setup engraved code.
>> +The result is constructed from `org-latex-engraved-preamble’ and
>> +`org-latex-engraved-options’.”
>
> This is relying on
>
> (:latex-engraved-options nil nil org-latex-engraved-options)
> (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
>
> If it changes any time in future (e.g. to allow per-file settings), the
> docstring may be overlooked.

Docstring tweaked.

> I’d use FIRST-MATCH argument for org-element-map. It will be slightly
> faster on large buffers.

Ah nice, I’ll make use of that.

>> -                       (downcase org-lang)))
>> +                       (downcase lang)))
>
> I am not sure if this belongs to this patch. Please double check.

Ooops, moved to the correct patch.

>> +                            (mapcar ’length
>> +                                    (org-split-string (car code-info)
>> +                                                      “”)))))
>
> I am not sure how well it will work with e.g. Chinese characters in comments.

I’ve added a patch replacing `length' with `string-width'

> Maybe the functions could be rewritten using cl-defun with keys and
> &allow-other-keys and then called via apply on a let-bound arg plist?

Done.

All the best,
Timothy

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From d231437e2c9f96bf70520d9ddda810a95667fcdd Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 1/7] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..c2f728a1c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From aa8406ce64507b870322495e8f9b54317930ed24 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 2/7] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 62 +++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index c2f728a1c..38f36a1f3 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,38 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using minted.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From 62d6703f0dd622916dff8aab960db6df4cb58cf7 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 3/7] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 38f36a1f3..2d4b3bace 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From 410fda41ae1efa67313ebbe2ada381c5d0f0a092 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 4/7] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-template, org-latex-listings): Make use of the engraved-faces
package (available on ELPA) to provide an alternative LaTeX code
highlighting backend which functions similarly to htmlize.el for HTML
exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |  11 ++
 lisp/ox-latex.el  | 276 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 278 insertions(+), 9 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..4d40f6a1d 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,17 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2d4b3bace..b9c6d4c3e 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two further options for more comprehensive
+fontification. The first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be set with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,127 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+% Make line numbers smaller and grey.
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+\\providecolor{codebackground}{HTML}{f7f7f7}
+\\providecolor{codeborder}{HTML}{f0f0f0}
+\\providecolor{EFD}{HTML}{28292e}
+
+% Define a Code environment to prettily wrap the fontified code.
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=codebackground, colframe=codeborder,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be, as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loader elsewhere).
+- Defines a \"Code\" environment (note the capital C), which all
+  \"Verbatim\" environments (provided by fvextra) will be wrapped with.
+
+A macro-like placeholder is used to set fvextra's defaults according to
+`org-latex-engraved-options':
+
+  [FVEXTRA-SETUP]
+
+In the default value the color \"EFD\" is provided as this is the
+foreground colour provided by engrave-faces-latex.  When there
+are example/fixed-width blocks only, the engraved generated
+preamble is not included, and so it is provided so we may use it
+anyway."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from the :latex-engraved-preamble and
+:latex-engraved-optionsn export options, the default values of
+which are given by `org-latex-engraved-preamble' and
+`org-latex-engraved-options' respectively."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble-template
+          (plist-get info :latex-engraved-preamble))
+         (engraved-preamble
+          (if (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?"
+                            engraved-preamble-template)
+              (replace-match
+               (concat
+                "\\fvset{%\n  "
+                (org-latex--make-option-string engraved-options ",\n  ")
+                "}\n")
+               t t
+               engraved-preamble-template)
+            engraved-preamble-template)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1908,17 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2305,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2157,6 +2321,24 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (_info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+      (let (engraved-buffer engraved-code)
+        (setq engraved-buffer
+              (with-temp-buffer
+                (insert code)
+                (funcall (org-src-get-lang-mode lang))
+                (engrave-faces-latex-buffer)))
+        (setq engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string)))
+        (kill-buffer engraved-buffer)
+        (format "\\Verb{%s}"
+                engraved-code))
+    (user-error "Cannot engrave inline src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -3017,6 +3199,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3318,79 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (if (require 'engrave-faces-latex nil t)
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content-buffer
+          (with-temp-buffer
+            (insert
+             (let* ((code-info (org-export-unravel-code src-block))
+                    (max-width
+                     (apply 'max
+                            (mapcar 'length
+                                    (org-split-string (car code-info)
+                                                      "\n")))))
+               (org-export-format-code
+                (car code-info)
+                (lambda (loc _num ref)
+                  (concat
+                   loc
+                   (when ref
+                     ;; Ensure references are flushed to the right,
+                     ;; separated with 6 spaces from the widest line
+                     ;; of code.
+                     (concat (make-string (+ (- max-width (length loc)) 6)
+                                          ?\s)
+                             (format "(%s)" ref)))))
+                nil (and retain-labels (cdr code-info)))))
+            (funcall (org-src-get-lang-mode lang))
+            (engrave-faces-latex-buffer)))
+         (content
+          (with-current-buffer content-buffer
+            (buffer-string)))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           content)))
+    (kill-buffer content-buffer)
+    ;; Return value.
+    (format float-env body))
+  (user-error "Cannot engrave src block, `engrave-faces-latex' is unavailible.")))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3


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From 531a8bdd52bc6c9b7ba0da847809c76f14221bb1 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 13:59:13 +0800
Subject: [PATCH 5/7] ox-latex: Don't use `length' to get string width

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted): Use
`string-width' instead of `length' to gauge the displayed width of the
string in LaTeX.  This may not be a perfect match, but it should be an
improvement.
---
 lisp/ox-latex.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index b9c6d4c3e..6a794c41c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3299,7 +3299,7 @@ (defun org-latex-src-block--minted
            (let* ((code-info (org-export-unravel-code src-block))
                   (max-width
                    (apply 'max
-                          (mapcar 'length
+                          (mapcar 'string-width
                                   (org-split-string (car code-info)
                                                     "\n")))))
              (org-export-format-code
@@ -3352,7 +3352,7 @@ (defun org-latex-src-block--engraved
              (let* ((code-info (org-export-unravel-code src-block))
                     (max-width
                      (apply 'max
-                            (mapcar 'length
+                            (mapcar 'string-width
                                     (org-split-string (car code-info)
                                                       "\n")))))
                (org-export-format-code
@@ -3442,7 +3442,7 @@ (defun org-latex-src-block--listings
       (let* ((code-info (org-export-unravel-code src-block))
              (max-width
               (apply 'max
-                     (mapcar 'length
+                     (mapcar 'string-width
                              (org-split-string (car code-info) "\n")))))
         (org-export-format-code
          (car code-info)
-- 
2.35.3


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From 1961039336917e6f4e3698aadccc03444dfc2592 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:02:44 +0800
Subject: [PATCH 6/7] ox-latex: Refactor source block transcode fun sigs

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted,
org-latex-src-block--custom): Refactor these --backend functions to use
cl-defun with keys instead of having an 11-argument signature.
(org-latex-src-block): Adjust for the change in signature of the
--backend functions, and refactor the `cond' statement to use `pcase'.
---
 lisp/ox-latex.el | 78 +++++++++++++++++++++++-------------------------
 1 file changed, 37 insertions(+), 41 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 6a794c41c..685899c7d 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3179,37 +3179,37 @@ (defun org-latex-src-block (src-block _contents info)
 contextual information."
   (when (org-string-nw-p (org-element-property :value src-block))
     (let* ((lang (org-element-property :language src-block))
-	   (caption (org-element-property :caption src-block))
-	   (caption-above-p (org-latex--caption-above-p src-block info))
-	   (label (org-element-property :name src-block))
-	   (custom-env (and lang
-			    (cadr (assq (intern lang)
-					org-latex-custom-lang-environments))))
-	   (num-start (org-export-get-loc src-block info))
-	   (retain-labels (org-element-property :retain-labels src-block))
-	   (attributes (org-export-read-attribute :attr_latex src-block))
-	   (float (plist-get attributes :float))
-	   (listings (plist-get info :latex-listings)))
-      (cond
-       ((or (not lang) (not listings))
-        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (custom-env
-        (org-latex-src-block--custom src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float custom-env))
-       ((eq listings 'minted)
-        (org-latex-src-block--minted src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float))
-       ((eq listings 'engraved)
-        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (t
-        (org-latex-src-block--listings src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))))))
-
-(defun org-latex-src-block--verbatim
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels _attributes float)
+           (caption (org-element-property :caption src-block))
+           (caption-above-p (org-latex--caption-above-p src-block info))
+           (label (org-element-property :name src-block))
+           (custom-env (and lang
+                            (cadr (assq (intern lang)
+                                        org-latex-custom-lang-environments))))
+           (num-start (org-export-get-loc src-block info))
+           (retain-labels (org-element-property :retain-labels src-block))
+           (attributes (org-export-read-attribute :attr_latex src-block))
+           (float (plist-get attributes :float))
+           (listings (plist-get info :latex-listings)))
+      (funcall
+       (pcase listings
+         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim
+          ((guard custom-env) #'org-latex-src-block--custom)
+          ('minted #'org-latex-src-block--minted)
+          ('engraved #'org-latex-src-block--engraved)
+          (_ #'org-latex-src-block--listings)))
+       :src-block src-block
+       :info info
+       :lang lang
+       :caption caption
+       :caption-above-p caption-above-p
+       :label label
+       :num-start num-start
+       :retain-labels retain-labels
+       :attributes attributes
+       :float float))))
+
+(cl-defun org-latex-src-block--verbatim
+    (&key src-block info caption caption-above-p float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3228,9 +3228,8 @@ (defun org-latex-src-block--verbatim
                     (if caption-above-p "" (concat "\n" caption-str))))
           (t verbatim))))
 
-(defun org-latex-src-block--custom
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels attributes float custom-env)
+(cl-defun org-latex-src-block--custom
+    (&key src-block info caption caption-above-p attributes float custom-env &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3251,8 +3250,7 @@ (defun org-latex-src-block--custom
                      (?o . ,(or (plist-get attributes :options) "")))))))
 
 (defun org-latex-src-block--minted
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3319,8 +3317,7 @@ (defun org-latex-src-block--minted
     (format float-env body)))
 
 (defun org-latex-src-block--engraved
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3391,9 +3388,8 @@ (defun org-latex-src-block--engraved
     (format float-env body))
   (user-error "Cannot engrave src block, `engrave-faces-latex' is unavailible.")))
 
-(defun org-latex-src-block--listings
-    (src-block info lang caption caption-above-p label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--listings
+    (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
-- 
2.35.3


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From 4d24b74e5490a30c75c7a23721c836a8ce4756b6 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:46:28 +0800
Subject: [PATCH 7/7] ox-latex: Replace `org-latex-listings'

* lisp/ox-latex.el (org-latex-src-block, org-latex-keyword,
org-latex-inline-src-block, org-latex-template,
org-latex--caption/label-string, org-latex-engraved-preamble,
org-latex-listings): Replace `org-latex-listings' with
`org-latex-src-block-backend', which now can be set to listings/verbatim
and no longer advertises t/nil as valid values.

* lisp/ox-beamer.el (org-beamer-template): Update in the same manner as
`org-latex-template'.

* lisp/org-compat.el: Make `org-latex-listings' an obsolete alias for
`org-latex-src-block-backend'.

* testing/lisp/test-ox.el: Replace `org-latex-listings' reference with
`org-latex-src-block-backend'.

* doc/org-manual.org (Footnotes, LaTeX specific properties, Literal
Examples): Replace references to `org-latex-listings' with
`org-latex-src-block-backend'.

* etc/ORG-NEWS: Add a news entry noting this change.

The variable `org-latex-listings' originally indicated whether source
blocks should use the listings LaTeX package, or not.  This usage has
evolved over the years, and now it sets one of four different
fontification backends.  This renaming should make the variable name a
bit less misleading.
---
 doc/org-manual.org      |   6 +--
 etc/ORG-NEWS            |   9 ++++
 lisp/org-compat.el      |   2 +
 lisp/ox-beamer.el       |   2 +-
 lisp/ox-latex.el        | 111 ++++++++++++++++++++++------------------
 testing/lisp/test-ox.el |   2 +-
 6 files changed, 78 insertions(+), 54 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index c0d38cd8c..60bded419 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -11159,7 +11159,7 @@ ** Literal Examples
 #+end_example
 
 #+cindex: formatting source code, markup rules
-#+vindex: org-latex-listings
+#+vindex: org-latex-src-block-backend
 If the example is source code from a programming language, or any
 other text that can be marked up by Font Lock in Emacs, you can ask
 for the example to look like the fontified Emacs buffer[fn:114].  This
@@ -16304,12 +16304,12 @@ **** LaTeX specific properties
 | ~:latex-link-with-unknown-path-format~ | ~org-latex-link-with-unknown-path-format~ |
 | ~:latex-listings-langs~                | ~org-latex-listings-langs~                |
 | ~:latex-listings-options~              | ~org-latex-listings-options~              |
-| ~:latex-listings~                      | ~org-latex-listings~                      |
 | ~:latex-minted-langs~                  | ~org-latex-minted-langs~                  |
 | ~:latex-minted-options~                | ~org-latex-minted-options~                |
 | ~:latex-prefer-user-labels~            | ~org-latex-prefer-user-labels~            |
 | ~:latex-subtitle-format~               | ~org-latex-subtitle-format~               |
 | ~:latex-subtitle-separate~             | ~org-latex-subtitle-separate~             |
+| ~:latex-src-block-backend~             | ~org-latex-src-block-backend~             |
 | ~:latex-table-scientific-notation~     | ~org-latex-table-scientific-notation~     |
 | ~:latex-tables-booktabs~               | ~org-latex-tables-booktabs~               |
 | ~:latex-tables-centered~               | ~org-latex-tables-centered~               |
@@ -22256,7 +22256,7 @@ * Footnotes
 version 1.34 of the =htmlize.el= package, which you need to install).
 Fontified code chunks in LaTeX can be achieved using either the
 [[https://www.ctan.org/pkg/listings][listings]] package or the [[https://www.ctan.org/pkg/minted][minted]] package.  Refer to
-~org-latex-listings~ for details.
+~org-latex-src-block-backend~ for details.
 
 [fn:115] Source code in code blocks may also be evaluated either
 interactively or on export.  See [[*Working with Source Code]] for more
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 1e8558c7b..c5f0bcb33 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -268,6 +268,15 @@ Chmod-style permissions are based on the new variable
 ~org-babel-tangle-default-file-mode~.
 
 *** A new custom setting =org-agenda-clock-report-header= to add a header to org agenda clock report
+
+*** ~org-latex-listings~ has been replaced with ~org-latex-src-block-backend~
+
+~org-latex-listings~ has been renamed to better reflect the current
+purpose of the variable.  The replacement variable
+~org-latex-src-block-backend~ acts in exactly the same way, however it
+accepts =listings= and =verbatim= in place of =t= and =nil= (which
+still work, but are no longer listed as valid options).
+
 * Version 9.5
 
 ** Important announcements and breaking changes
diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index f599e246e..c1a78e834 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -324,6 +324,8 @@ (define-obsolete-variable-alias 'org-latex-create-formula-image-program
   'org-preview-latex-default-process "9.0")
 (define-obsolete-variable-alias 'org-latex-preview-ltxpng-directory
   'org-preview-latex-image-directory "9.0")
+(define-obsolete-variable-alias 'org-latex-listings
+  'org-latex-src-block-backend "9.6")
 (define-obsolete-function-alias 'org-table-p 'org-at-table-p "9.0")
 (define-obsolete-function-alias 'org-on-heading-p 'org-at-heading-p "9.0")
 (define-obsolete-function-alias 'org-at-regexp-p 'org-in-regexp "8.3")
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 4d40f6a1d..3baa4e26e 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -858,7 +858,7 @@ (defun org-beamer-template (contents info)
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 685899c7d..8f4206164 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -143,7 +143,7 @@ (org-export-define-backend 'latex
     (:latex-inactive-timestamp-format nil nil org-latex-inactive-timestamp-format)
     (:latex-inline-image-rules nil nil org-latex-inline-image-rules)
     (:latex-link-with-unknown-path-format nil nil org-latex-link-with-unknown-path-format)
-    (:latex-listings nil nil org-latex-listings)
+    (:latex-src-block-backend nil nil org-latex-src-block-backend)
     (:latex-listings-langs nil nil org-latex-listings-langs)
     (:latex-listings-options nil nil org-latex-listings-options)
     (:latex-minted-langs nil nil org-latex-minted-langs)
@@ -937,22 +937,22 @@ (defcustom org-latex-format-inlinetask-function
 
 ;; Src blocks
 
-(defcustom org-latex-listings nil
-  "Non-nil means export source code using the listings package.
+(defcustom org-latex-src-block-backend 'verbatim
+  "Backend used to generate source code listings.
 
-This package will fontify source code, possibly even with color.
-There are four implementations of this functionality you may
+This sets the behaviour for fontifying source code, possibly even with
+color.  There are four implementations of this functionality you may
 choose from (ordered from least to most capable):
-1. Verbatim (nil)
-2. Listings (t)
-3. Minted (minted)
-4. Engraved (engraved)
+1. Verbatim
+2. Listings
+3. Minted
+4. Engraved
 
 The first two options provide basic syntax
 highlighting (listings), or none at all (verbatim).
 
-When using listings, you also need to make use of the LaTeX
-\"listings\" package. The \"color\" package is also needed if you
+When using listings, you also need to make use of LaTeX package
+\"listings\"e. The \"color\" LaTeX package is also needed if you
 would like color too.  These can simply be added to
 `org-latex-packages-alist', using customise or something like:
 
@@ -963,27 +963,12 @@ (defcustom org-latex-listings nil
 There are two further options for more comprehensive
 fontification. The first can be set with,
 
-  (setq org-latex-listings \\='engraved)
+  (setq org-latex-src-block-backend \\='minted)
 
-which causes source code to be run through
-`engrave-faces-latex-buffer', which generates colorings using
-Emacs' font-lock information.  This requires the engrave-faces
-package (availible from ELPA), and the fvextra LaTeX package be
-installed.
-
-The styling of the engraved result can customised with
-`org-latex-engraved-preamble' and `org-latex-engraved-options'.
-The default preamble also uses the tcolorbox LaTeX package in
-addition to fvextra.
-
-The second more comprehensive option can be set with,
-
-  (setq org-latex-listings \\='minted)
-
-which causes source code to be exported using the minted package
-as opposed to listings.  If you want to use minted, you need to
-add the minted package to `org-latex-packages-alist', for example
-using customize, or with
+which causes source code to be exported using the LaTeX package
+minted as opposed to listings.  If you want to use minted, you
+need to add the minted package to `org-latex-packages-alist', for
+example using customize, or with
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"newfloat\" \"minted\"))
@@ -996,14 +981,29 @@ (defcustom org-latex-listings nil
 The minted choice has possible repercussions on the preview of
 latex fragments (see `org-preview-latex-fragment').  If you run
 into previewing problems, please consult
-URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'."
+URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'.
+
+The most comprehensive option can be set with,
+
+  (setq org-latex-src-block-backend \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the Emacs package
+engrave-faces (availible from ELPA), and the LaTeX package
+fvextra be installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the LaTeX package tcolorbox in
+addition to fvextra."
   :group 'org-export-latex
   :type '(choice
-	  (const :tag "Use listings" t)
+	  (const :tag "Use listings" listings)
 	  (const :tag "Use minted" minted)
 	  (const :tag "Use engrave-faces-latex" engraved)
-	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted engraved))))
+	  (const :tag "Export verbatim" verbatim))
+  :safe (lambda (s) (memq s '(listings minted engraved verbatim))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1201,7 +1201,7 @@ (defcustom org-latex-engraved-preamble
   right=2pt, top=1pt, bottom=0.5pt,
   breakable}"
   "Preamble content injected when using engrave-faces-latex for source blocks.
-This is relevant when `org-latex-listings' is set to `engraved'.
+This is relevant when `org-latex-src-block-backend' is set to `engraved'.
 
 There is quite a lot of flexibility in what this preamble can be, as long as it:
 - Loads the fvextra package.
@@ -1502,7 +1502,8 @@ (defun org-latex--caption/label-string (element info)
 			    main)
 		       (and (eq type 'src-block)
 			    (not (plist-get attr :float))
-			    (null (plist-get info :latex-listings)))))
+			    (memq (plist-get info :latex-src-block-backend)
+                                  '(verbatim nil)))))
 	 (short (org-export-get-caption element t))
 	 (caption-from-attr-latex (plist-get attr :caption)))
     (cond
@@ -1522,7 +1523,8 @@ (defun org-latex--caption/label-string (element info)
 		      (paragraph "figure")
 		      (image "figure")
 		      (special-block "figure")
-		      (src-block (if (plist-get info :latex-listings)
+		      (src-block (if (not (memq (plist-get info :latex-src-block-backend)
+                                                '(verbatim nil)))
 				     "listing"
 				   "figure"))
 		      (t (symbol-name type*)))
@@ -1909,7 +1911,7 @@ (defun org-latex-template (contents info)
        (and (stringp template)
             (format-spec template spec)))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
@@ -2302,11 +2304,17 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
 contextual information."
   (let ((code (org-element-property :value inline-src-block))
         (lang (org-element-property :language inline-src-block)))
-    (pcase (plist-get info :latex-listings)
-      ('nil (org-latex--text-markup code 'code info))
+    (pcase (plist-get info :latex-src-block-backend)
+      ('verbatim (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
       ('engraved (org-latex-inline-src-block--engraved info code lang))
-      (_ (org-latex-inline-src-block--listings info code lang)))))
+      ('listings (org-latex-inline-src-block--listings info code lang))
+      (oldval
+       (message "Please update the LaTeX src-block-backend to %s"
+                (if oldval "listings" "verbatim"))
+       (if oldval
+           (org-latex-inline-src-block--listings info code lang)
+         (org-latex--text-markup code 'code info))))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using minted.
@@ -2502,7 +2510,7 @@ (defun org-latex-keyword (keyword _contents info)
 	      (concat depth (and depth "\n") "\\tableofcontents"))))
 	 ((string-match-p "\\<tables\\>" value) "\\listoftables")
 	 ((string-match-p "\\<listings\\>" value)
-	  (cl-case (plist-get info :latex-listings)
+	  (cl-case (plist-get info :latex-src-block-backend)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
 	    (otherwise "\\lstlistoflistings")))))))))
@@ -3188,15 +3196,20 @@ (defun org-latex-src-block (src-block _contents info)
            (num-start (org-export-get-loc src-block info))
            (retain-labels (org-element-property :retain-labels src-block))
            (attributes (org-export-read-attribute :attr_latex src-block))
-           (float (plist-get attributes :float))
-           (listings (plist-get info :latex-listings)))
+           (float (plist-get attributes :float)))
       (funcall
-       (pcase listings
-         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim
-          ((guard custom-env) #'org-latex-src-block--custom)
+       (pcase (plist-get info :latex-src-block-backend)
+         ((or 'verbatim (guard (not lang))) #'org-latex-src-block--verbatim
           ('minted #'org-latex-src-block--minted)
           ('engraved #'org-latex-src-block--engraved)
-          (_ #'org-latex-src-block--listings)))
+          ('listings #'org-latex-src-block--listings)
+          ((guard custom-env) #'org-latex-src-block--custom)
+          (oldval
+           (message "Please update the LaTeX src-block-backend to %s"
+                    (if oldval "listings" "verbatim"))
+           (if oldval
+               #'org-latex-src-block--listings
+             #'org-latex-src-block--verbatim))))
        :src-block src-block
        :info info
        :lang lang
diff --git a/testing/lisp/test-ox.el b/testing/lisp/test-ox.el
index 25e02b258..28f950813 100644
--- a/testing/lisp/test-ox.el
+++ b/testing/lisp/test-ox.el
@@ -3978,7 +3978,7 @@ (ert-deftest test-org-export/latex-src-block-verbatim-caption ()
 \\end{verbatim}
 \\caption{Caption is below, 60\\%s}
 \\end{figure*}"
-	     (let ((org-latex-listings 'minted) ; inactive due to missing lang
+	     (let ((org-latex-src-block-backend 'minted) ; inactive due to missing lang
 		   (org-latex-default-figure-position "tp"))
 	       ;; Namely "multicolumn" value to get just figure environment
 	       ;; looks like a bug.
-- 
2.35.3

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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Ooops, a paren error managed to slip in there.

Here’s a new set, with a little extra refactoring slipped in.

–
Timothy

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From d231437e2c9f96bf70520d9ddda810a95667fcdd Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 1/7] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..c2f728a1c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From aa8406ce64507b870322495e8f9b54317930ed24 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 2/7] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 62 +++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index c2f728a1c..38f36a1f3 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,38 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using minted.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From 62d6703f0dd622916dff8aab960db6df4cb58cf7 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 3/7] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 38f36a1f3..2d4b3bace 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From 81155a80fb261812718dcb991fd22f87bb1d5ef6 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 4/7] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-src--engrave-code, org-latex-template, org-latex-listings):
Make use of the engraved-faces package (available on ELPA) to provide an
alternative LaTeX code highlighting backend which functions similarly to
htmlize.el for HTML exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.

tweak
---
 lisp/ox-beamer.el |  11 ++
 lisp/ox-latex.el  | 272 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 274 insertions(+), 9 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..4d40f6a1d 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,17 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2d4b3bace..10cd6d76d 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two further options for more comprehensive
+fontification. The first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be set with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,127 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+% Make line numbers smaller and grey.
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+\\providecolor{codebackground}{HTML}{f7f7f7}
+\\providecolor{codeborder}{HTML}{f0f0f0}
+\\providecolor{EFD}{HTML}{28292e}
+
+% Define a Code environment to prettily wrap the fontified code.
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=codebackground, colframe=codeborder,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be, as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loader elsewhere).
+- Defines a \"Code\" environment (note the capital C), which all
+  \"Verbatim\" environments (provided by fvextra) will be wrapped with.
+
+A macro-like placeholder is used to set fvextra's defaults according to
+`org-latex-engraved-options':
+
+  [FVEXTRA-SETUP]
+
+In the default value the color \"EFD\" is provided as this is the
+foreground colour provided by engrave-faces-latex.  When there
+are example/fixed-width blocks only, the engraved generated
+preamble is not included, and so it is provided so we may use it
+anyway."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from the :latex-engraved-preamble and
+:latex-engraved-optionsn export options, the default values of
+which are given by `org-latex-engraved-preamble' and
+`org-latex-engraved-options' respectively."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble-template
+          (plist-get info :latex-engraved-preamble))
+         (engraved-preamble
+          (if (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?"
+                            engraved-preamble-template)
+              (replace-match
+               (concat
+                "\\fvset{%\n  "
+                (org-latex--make-option-string engraved-options ",\n  ")
+                "}\n")
+               t t
+               engraved-preamble-template)
+            engraved-preamble-template)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1908,17 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2305,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2157,6 +2321,11 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (_info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (format "\\Verb{%s}" (org-latex-src--engrave-code code lang)))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -3017,6 +3186,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3305,88 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src--engrave-code (content lang)
+  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
+  (if (require 'engrave-faces-latex nil t)
+      (let* ((lang-mode (and lang (org-src-get-lang-mode lang)))
+             (engraved-buffer
+              (with-temp-buffer
+                (insert content)
+                (when lang-mode
+                  (if (functionp lang-mode)
+                      (funcall lang-mode)
+                    (message "Cannot engrave code as %s. %s is undefined."
+                             lang lang-mode)))
+                (engrave-faces-latex-buffer)))
+             (engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string))))
+        (kill-buffer engraved-buffer)
+        engraved-code)
+    (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
+
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content
+          (let* ((code-info (org-export-unravel-code src-block))
+                 (max-width
+                  (apply 'max
+                         (mapcar 'string-width
+                                 (org-split-string (car code-info)
+                                                   "\n")))))
+            (org-export-format-code
+             (car code-info)
+             (lambda (loc _num ref)
+               (concat
+                loc
+                (when ref
+                  ;; Ensure references are flushed to the right,
+                  ;; separated with 6 spaces from the widest line
+                  ;; of code.
+                  (concat (make-string (+ (- max-width (length loc)) 6)
+                                       ?\s)
+                          (format "(%s)" ref)))))
+             nil (and retain-labels (cdr code-info)))))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           (org-latex-src--engrave-code content lang))))
+    (format float-env body)))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3


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From 96cf9853329dacd69745a225a889855dd13e5c2c Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 13:59:13 +0800
Subject: [PATCH 5/7] ox-latex: Don't use `length' to get string width

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted): Use
`string-width' instead of `length' to gauge the displayed width of the
string in LaTeX.  This may not be a perfect match, but it should be an
improvement.
---
 lisp/ox-latex.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 10cd6d76d..afd7ee48e 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3286,7 +3286,7 @@ (defun org-latex-src-block--minted
            (let* ((code-info (org-export-unravel-code src-block))
                   (max-width
                    (apply 'max
-                          (mapcar 'length
+                          (mapcar 'string-width
                                   (org-split-string (car code-info)
                                                     "\n")))))
              (org-export-format-code
@@ -3438,7 +3438,7 @@ (defun org-latex-src-block--listings
       (let* ((code-info (org-export-unravel-code src-block))
              (max-width
               (apply 'max
-                     (mapcar 'length
+                     (mapcar 'string-width
                              (org-split-string (car code-info) "\n")))))
         (org-export-format-code
          (car code-info)
-- 
2.35.3


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From f191a03ef97f5f8e29b18b73238ab659709ae230 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:02:44 +0800
Subject: [PATCH 6/7] ox-latex: Refactor source block transcode fun sigs

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted,
org-latex-src-block--custom): Refactor these --backend functions to use
cl-defun with keys instead of having an 11-argument signature.
(org-latex-src-block): Adjust for the change in signature of the
--backend functions, and refactor the `cond' statement to use `pcase'.
---
 lisp/ox-latex.el | 82 +++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 43 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index afd7ee48e..9150c1011 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3166,37 +3166,37 @@ (defun org-latex-src-block (src-block _contents info)
 contextual information."
   (when (org-string-nw-p (org-element-property :value src-block))
     (let* ((lang (org-element-property :language src-block))
-	   (caption (org-element-property :caption src-block))
-	   (caption-above-p (org-latex--caption-above-p src-block info))
-	   (label (org-element-property :name src-block))
-	   (custom-env (and lang
-			    (cadr (assq (intern lang)
-					org-latex-custom-lang-environments))))
-	   (num-start (org-export-get-loc src-block info))
-	   (retain-labels (org-element-property :retain-labels src-block))
-	   (attributes (org-export-read-attribute :attr_latex src-block))
-	   (float (plist-get attributes :float))
-	   (listings (plist-get info :latex-listings)))
-      (cond
-       ((or (not lang) (not listings))
-        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (custom-env
-        (org-latex-src-block--custom src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float custom-env))
-       ((eq listings 'minted)
-        (org-latex-src-block--minted src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float))
-       ((eq listings 'engraved)
-        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (t
-        (org-latex-src-block--listings src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))))))
-
-(defun org-latex-src-block--verbatim
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels _attributes float)
+           (caption (org-element-property :caption src-block))
+           (caption-above-p (org-latex--caption-above-p src-block info))
+           (label (org-element-property :name src-block))
+           (custom-env (and lang
+                            (cadr (assq (intern lang)
+                                        org-latex-custom-lang-environments))))
+           (num-start (org-export-get-loc src-block info))
+           (retain-labels (org-element-property :retain-labels src-block))
+           (attributes (org-export-read-attribute :attr_latex src-block))
+           (float (plist-get attributes :float))
+           (listings (plist-get info :latex-listings)))
+      (funcall
+       (pcase listings
+         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
+         ((guard custom-env) #'org-latex-src-block--custom)
+         ('minted #'org-latex-src-block--minted)
+         ('engraved #'org-latex-src-block--engraved)
+         (_ #'org-latex-src-block--listings))
+       :src-block src-block
+       :info info
+       :lang lang
+       :caption caption
+       :caption-above-p caption-above-p
+       :label label
+       :num-start num-start
+       :retain-labels retain-labels
+       :attributes attributes
+       :float float))))
+
+(cl-defun org-latex-src-block--verbatim
+    (&key src-block info caption caption-above-p float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3215,9 +3215,8 @@ (defun org-latex-src-block--verbatim
                     (if caption-above-p "" (concat "\n" caption-str))))
           (t verbatim))))
 
-(defun org-latex-src-block--custom
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels attributes float custom-env)
+(cl-defun org-latex-src-block--custom
+    (&key src-block info caption caption-above-p attributes float custom-env &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3237,9 +3236,8 @@ (defun org-latex-src-block--custom
                      (?l . ,(org-latex--label src-block info))
                      (?o . ,(or (plist-get attributes :options) "")))))))
 
-(defun org-latex-src-block--minted
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--minted
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3325,9 +3323,8 @@ (defun org-latex-src--engrave-code (content lang)
         engraved-code)
     (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
 
-(defun org-latex-src-block--engraved
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--engraved
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3387,9 +3384,8 @@ (defun org-latex-src-block--engraved
            (org-latex-src--engrave-code content lang))))
     (format float-env body)))
 
-(defun org-latex-src-block--listings
-    (src-block info lang caption caption-above-p label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--listings
+    (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
-- 
2.35.3


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From adb4b6df3b4549fd6afd6cfb6ae8945e89882cfc Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:46:28 +0800
Subject: [PATCH 7/7] ox-latex: Replace `org-latex-listings'

* lisp/ox-latex.el (org-latex-src-block, org-latex-keyword,
org-latex-inline-src-block, org-latex-template,
org-latex--caption/label-string, org-latex-engraved-preamble,
org-latex-listings): Replace `org-latex-listings' with
`org-latex-src-block-backend', which now can be set to listings/verbatim
and no longer advertises t/nil as valid values.

* lisp/ox-beamer.el (org-beamer-template): Update in the same manner as
`org-latex-template'.

* lisp/org-compat.el: Make `org-latex-listings' an obsolete alias for
`org-latex-src-block-backend'.

* testing/lisp/test-ox.el: Replace `org-latex-listings' reference with
`org-latex-src-block-backend'.

* doc/org-manual.org (Footnotes, LaTeX specific properties, Literal
Examples): Replace references to `org-latex-listings' with
`org-latex-src-block-backend'.

* etc/ORG-NEWS: Add a news entry noting this change.

The variable `org-latex-listings' originally indicated whether source
blocks should use the listings LaTeX package, or not.  This usage has
evolved over the years, and now it sets one of four different
fontification backends.  This renaming should make the variable name a
bit less misleading.
---
 doc/org-manual.org      |   6 +--
 etc/ORG-NEWS            |   9 ++++
 lisp/org-compat.el      |   2 +
 lisp/ox-beamer.el       |   2 +-
 lisp/ox-latex.el        | 111 ++++++++++++++++++++++------------------
 testing/lisp/test-ox.el |   2 +-
 6 files changed, 78 insertions(+), 54 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index c0d38cd8c..60bded419 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -11159,7 +11159,7 @@ ** Literal Examples
 #+end_example
 
 #+cindex: formatting source code, markup rules
-#+vindex: org-latex-listings
+#+vindex: org-latex-src-block-backend
 If the example is source code from a programming language, or any
 other text that can be marked up by Font Lock in Emacs, you can ask
 for the example to look like the fontified Emacs buffer[fn:114].  This
@@ -16304,12 +16304,12 @@ **** LaTeX specific properties
 | ~:latex-link-with-unknown-path-format~ | ~org-latex-link-with-unknown-path-format~ |
 | ~:latex-listings-langs~                | ~org-latex-listings-langs~                |
 | ~:latex-listings-options~              | ~org-latex-listings-options~              |
-| ~:latex-listings~                      | ~org-latex-listings~                      |
 | ~:latex-minted-langs~                  | ~org-latex-minted-langs~                  |
 | ~:latex-minted-options~                | ~org-latex-minted-options~                |
 | ~:latex-prefer-user-labels~            | ~org-latex-prefer-user-labels~            |
 | ~:latex-subtitle-format~               | ~org-latex-subtitle-format~               |
 | ~:latex-subtitle-separate~             | ~org-latex-subtitle-separate~             |
+| ~:latex-src-block-backend~             | ~org-latex-src-block-backend~             |
 | ~:latex-table-scientific-notation~     | ~org-latex-table-scientific-notation~     |
 | ~:latex-tables-booktabs~               | ~org-latex-tables-booktabs~               |
 | ~:latex-tables-centered~               | ~org-latex-tables-centered~               |
@@ -22256,7 +22256,7 @@ * Footnotes
 version 1.34 of the =htmlize.el= package, which you need to install).
 Fontified code chunks in LaTeX can be achieved using either the
 [[https://www.ctan.org/pkg/listings][listings]] package or the [[https://www.ctan.org/pkg/minted][minted]] package.  Refer to
-~org-latex-listings~ for details.
+~org-latex-src-block-backend~ for details.
 
 [fn:115] Source code in code blocks may also be evaluated either
 interactively or on export.  See [[*Working with Source Code]] for more
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 1e8558c7b..c5f0bcb33 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -268,6 +268,15 @@ Chmod-style permissions are based on the new variable
 ~org-babel-tangle-default-file-mode~.
 
 *** A new custom setting =org-agenda-clock-report-header= to add a header to org agenda clock report
+
+*** ~org-latex-listings~ has been replaced with ~org-latex-src-block-backend~
+
+~org-latex-listings~ has been renamed to better reflect the current
+purpose of the variable.  The replacement variable
+~org-latex-src-block-backend~ acts in exactly the same way, however it
+accepts =listings= and =verbatim= in place of =t= and =nil= (which
+still work, but are no longer listed as valid options).
+
 * Version 9.5
 
 ** Important announcements and breaking changes
diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index f599e246e..c1a78e834 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -324,6 +324,8 @@ (define-obsolete-variable-alias 'org-latex-create-formula-image-program
   'org-preview-latex-default-process "9.0")
 (define-obsolete-variable-alias 'org-latex-preview-ltxpng-directory
   'org-preview-latex-image-directory "9.0")
+(define-obsolete-variable-alias 'org-latex-listings
+  'org-latex-src-block-backend "9.6")
 (define-obsolete-function-alias 'org-table-p 'org-at-table-p "9.0")
 (define-obsolete-function-alias 'org-on-heading-p 'org-at-heading-p "9.0")
 (define-obsolete-function-alias 'org-at-regexp-p 'org-in-regexp "8.3")
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 4d40f6a1d..3baa4e26e 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -858,7 +858,7 @@ (defun org-beamer-template (contents info)
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 9150c1011..ffa89188b 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -143,7 +143,7 @@ (org-export-define-backend 'latex
     (:latex-inactive-timestamp-format nil nil org-latex-inactive-timestamp-format)
     (:latex-inline-image-rules nil nil org-latex-inline-image-rules)
     (:latex-link-with-unknown-path-format nil nil org-latex-link-with-unknown-path-format)
-    (:latex-listings nil nil org-latex-listings)
+    (:latex-src-block-backend nil nil org-latex-src-block-backend)
     (:latex-listings-langs nil nil org-latex-listings-langs)
     (:latex-listings-options nil nil org-latex-listings-options)
     (:latex-minted-langs nil nil org-latex-minted-langs)
@@ -937,22 +937,22 @@ (defcustom org-latex-format-inlinetask-function
 
 ;; Src blocks
 
-(defcustom org-latex-listings nil
-  "Non-nil means export source code using the listings package.
+(defcustom org-latex-src-block-backend 'verbatim
+  "Backend used to generate source code listings.
 
-This package will fontify source code, possibly even with color.
-There are four implementations of this functionality you may
+This sets the behaviour for fontifying source code, possibly even with
+color.  There are four implementations of this functionality you may
 choose from (ordered from least to most capable):
-1. Verbatim (nil)
-2. Listings (t)
-3. Minted (minted)
-4. Engraved (engraved)
+1. Verbatim
+2. Listings
+3. Minted
+4. Engraved
 
 The first two options provide basic syntax
 highlighting (listings), or none at all (verbatim).
 
-When using listings, you also need to make use of the LaTeX
-\"listings\" package. The \"color\" package is also needed if you
+When using listings, you also need to make use of LaTeX package
+\"listings\"e. The \"color\" LaTeX package is also needed if you
 would like color too.  These can simply be added to
 `org-latex-packages-alist', using customise or something like:
 
@@ -963,27 +963,12 @@ (defcustom org-latex-listings nil
 There are two further options for more comprehensive
 fontification. The first can be set with,
 
-  (setq org-latex-listings \\='engraved)
+  (setq org-latex-src-block-backend \\='minted)
 
-which causes source code to be run through
-`engrave-faces-latex-buffer', which generates colorings using
-Emacs' font-lock information.  This requires the engrave-faces
-package (availible from ELPA), and the fvextra LaTeX package be
-installed.
-
-The styling of the engraved result can customised with
-`org-latex-engraved-preamble' and `org-latex-engraved-options'.
-The default preamble also uses the tcolorbox LaTeX package in
-addition to fvextra.
-
-The second more comprehensive option can be set with,
-
-  (setq org-latex-listings \\='minted)
-
-which causes source code to be exported using the minted package
-as opposed to listings.  If you want to use minted, you need to
-add the minted package to `org-latex-packages-alist', for example
-using customize, or with
+which causes source code to be exported using the LaTeX package
+minted as opposed to listings.  If you want to use minted, you
+need to add the minted package to `org-latex-packages-alist', for
+example using customize, or with
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"newfloat\" \"minted\"))
@@ -996,14 +981,29 @@ (defcustom org-latex-listings nil
 The minted choice has possible repercussions on the preview of
 latex fragments (see `org-preview-latex-fragment').  If you run
 into previewing problems, please consult
-URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'."
+URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'.
+
+The most comprehensive option can be set with,
+
+  (setq org-latex-src-block-backend \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the Emacs package
+engrave-faces (availible from ELPA), and the LaTeX package
+fvextra be installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the LaTeX package tcolorbox in
+addition to fvextra."
   :group 'org-export-latex
   :type '(choice
-	  (const :tag "Use listings" t)
+	  (const :tag "Use listings" listings)
 	  (const :tag "Use minted" minted)
 	  (const :tag "Use engrave-faces-latex" engraved)
-	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted engraved))))
+	  (const :tag "Export verbatim" verbatim))
+  :safe (lambda (s) (memq s '(listings minted engraved verbatim))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1201,7 +1201,7 @@ (defcustom org-latex-engraved-preamble
   right=2pt, top=1pt, bottom=0.5pt,
   breakable}"
   "Preamble content injected when using engrave-faces-latex for source blocks.
-This is relevant when `org-latex-listings' is set to `engraved'.
+This is relevant when `org-latex-src-block-backend' is set to `engraved'.
 
 There is quite a lot of flexibility in what this preamble can be, as long as it:
 - Loads the fvextra package.
@@ -1502,7 +1502,8 @@ (defun org-latex--caption/label-string (element info)
 			    main)
 		       (and (eq type 'src-block)
 			    (not (plist-get attr :float))
-			    (null (plist-get info :latex-listings)))))
+			    (memq (plist-get info :latex-src-block-backend)
+                                  '(verbatim nil)))))
 	 (short (org-export-get-caption element t))
 	 (caption-from-attr-latex (plist-get attr :caption)))
     (cond
@@ -1522,7 +1523,8 @@ (defun org-latex--caption/label-string (element info)
 		      (paragraph "figure")
 		      (image "figure")
 		      (special-block "figure")
-		      (src-block (if (plist-get info :latex-listings)
+		      (src-block (if (not (memq (plist-get info :latex-src-block-backend)
+                                                '(verbatim nil)))
 				     "listing"
 				   "figure"))
 		      (t (symbol-name type*)))
@@ -1909,7 +1911,7 @@ (defun org-latex-template (contents info)
        (and (stringp template)
             (format-spec template spec)))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
@@ -2302,11 +2304,17 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
 contextual information."
   (let ((code (org-element-property :value inline-src-block))
         (lang (org-element-property :language inline-src-block)))
-    (pcase (plist-get info :latex-listings)
-      ('nil (org-latex--text-markup code 'code info))
+    (pcase (plist-get info :latex-src-block-backend)
+      ('verbatim (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
       ('engraved (org-latex-inline-src-block--engraved info code lang))
-      (_ (org-latex-inline-src-block--listings info code lang)))))
+      ('listings (org-latex-inline-src-block--listings info code lang))
+      (oldval
+       (message "Please update the LaTeX src-block-backend to %s"
+                (if oldval "listings" "verbatim"))
+       (if oldval
+           (org-latex-inline-src-block--listings info code lang)
+         (org-latex--text-markup code 'code info))))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using minted.
@@ -2489,7 +2497,7 @@ (defun org-latex-keyword (keyword _contents info)
 	      (concat depth (and depth "\n") "\\tableofcontents"))))
 	 ((string-match-p "\\<tables\\>" value) "\\listoftables")
 	 ((string-match-p "\\<listings\\>" value)
-	  (cl-case (plist-get info :latex-listings)
+	  (cl-case (plist-get info :latex-src-block-backend)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
 	    (otherwise "\\lstlistoflistings")))))))))
@@ -3175,15 +3183,20 @@ (defun org-latex-src-block (src-block _contents info)
            (num-start (org-export-get-loc src-block info))
            (retain-labels (org-element-property :retain-labels src-block))
            (attributes (org-export-read-attribute :attr_latex src-block))
-           (float (plist-get attributes :float))
-           (listings (plist-get info :latex-listings)))
+           (float (plist-get attributes :float)))
       (funcall
-       (pcase listings
-         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
-         ((guard custom-env) #'org-latex-src-block--custom)
+       (pcase (plist-get info :latex-src-block-backend)
+         ((or 'verbatim (guard (not lang))) #'org-latex-src-block--verbatim)
          ('minted #'org-latex-src-block--minted)
          ('engraved #'org-latex-src-block--engraved)
-         (_ #'org-latex-src-block--listings))
+         ('listings #'org-latex-src-block--listings)
+         ((guard custom-env) #'org-latex-src-block--custom)
+         (oldval
+          (message "Please update the LaTeX src-block-backend to %s"
+                   (if oldval "listings" "verbatim"))
+          (if oldval
+              #'org-latex-src-block--listings
+            #'org-latex-src-block--verbatim)))
        :src-block src-block
        :info info
        :lang lang
diff --git a/testing/lisp/test-ox.el b/testing/lisp/test-ox.el
index 25e02b258..28f950813 100644
--- a/testing/lisp/test-ox.el
+++ b/testing/lisp/test-ox.el
@@ -3978,7 +3978,7 @@ (ert-deftest test-org-export/latex-src-block-verbatim-caption ()
 \\end{verbatim}
 \\caption{Caption is below, 60\\%s}
 \\end{figure*}"
-	     (let ((org-latex-listings 'minted) ; inactive due to missing lang
+	     (let ((org-latex-src-block-backend 'minted) ; inactive due to missing lang
 		   (org-latex-default-figure-position "tp"))
 	       ;; Namely "multicolumn" value to get just figure environment
 	       ;; looks like a bug.
-- 
2.35.3

Re: [PATCH] New LaTeX code export option: engraved

[Daniel Fleischer]

Hi Timothy,

Very nice set of patches, it looks good. Listings and minted are still
workable options and your new engrave library is available. I must admit
it's not clear how to customize faces since engrave is a bridge between
major modes choices and latex but maybe show one or two examples (say
elisp and python) of how to change/override some face.

I think next we should apply these patches and be open to feedback
about source code latex export using these new changes. I also wish
there was a bit more documentation, but we can add more with time.

Maybe some feedback from Nicolas G.?

Best,

-- 

Daniel Fleischer

Re: [PATCH] (v2) New LaTeX code export option: engraved

[Timothy]

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Hi Daniel & co.,

I have a new set of patches (attached), which make use of a major new feature in
engrave-faces v0.3: engraved themes.

Now, the theme used for source blocks can be set by the document keyword
`#+latex_engraved_theme: THEME-NAME'. Furthermore, the theme can be customised on
a per-code-block basis with `#+attr_latex: :engraved-theme THEME-NAME'.

If you try this out, make sure you have the most recent commit of engrave-faces
(531ea687e, soon to be released in v0.3.1).

I’ve also fixed the “Bug: Percentage in caption (even escaped) does not work in
LaTeX export” that Max raised
(<https://list.orgmode.org/YT2PR01MB45101E27DC6251D8F8B7B366F6EC9@YT2PR01MB4510.CANPRD01.PROD.OUTLOOK.COM>).

Daniel Fleischer <danflscr@gmail.com> writes:

> Very nice set of patches, it looks good.

Glad to hear you’ve been able to have a look over the patches. With the feedback
I’ve received here so far, if no issues come up in the next few days I’m
inclined to merge this, add documentation, and see what feedback pops up.

> I must admit it’s not clear how to customize faces since engrave is a bridge
> between major modes choices and latex but maybe show one or two examples (say
> elisp and python) of how to change/override some face.

Sure. The result should be visually identical to what you’d see in elisp/python
buffer, but possibly with a different theme.

Say you wanted to use a tweaked version of the default theme, this could be
accomplished like so:
┌────
│ (setq default2 (alist-get 'default engrave-faces-themes))
│ ;; Make comments hot pink
│ (plist-put (alist-get 'font-lock-comment-face default2) :foreground "#ff69b4")
│ ;; Any other customisations...
│ (add-to-list 'engrave-faces-themes (cons 'default2 default2))
└────

Then in the Org file you can use the “default2” engraved theme with
`#+latex_engraved_theme: default2'.

Let me know if there are any other examples you’d like to see.

> I think next we should apply these patches and be open to feedback
> about source code latex export using these new changes. I also wish
> there was a bit more documentation, but we can add more with time.
> Maybe some feedback from Nicolas G.?

👍 see my earlier comment on merging.

All the best,
Timothy

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From 18adbd0e1226cf3307090861e09e92bfa9cdfbf1 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 01/10] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..c2f728a1c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From 6635b72356192c3b0be500984b327d0b4ebd8e2b Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 02/10] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 62 +++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index c2f728a1c..38f36a1f3 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,38 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using minted.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From 108f321a80de89c72974fc25fcde36c85023daca Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 03/10] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 38f36a1f3..2d4b3bace 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From 6f2edb89ff4dd5ce7d6618fc13fa83cbeb028e7b Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 04/10] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-src--engrave-code, org-latex-template, org-latex-listings):
Make use of the engraved-faces package (available on ELPA) to provide an
alternative LaTeX code highlighting backend which functions similarly to
htmlize.el for HTML exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |  11 ++
 lisp/ox-latex.el  | 294 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 296 insertions(+), 9 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..4d40f6a1d 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,17 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2d4b3bace..1f4d4007d 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two further options for more comprehensive
+fontification. The first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be set with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,148 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+% Make line numbers smaller and grey.
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+% In case engrave-faces-latex-gen-preamble has not been run.
+\\providecolor{EfD}{HTML}{f7f7f7}
+\\providecolor{EFD}{HTML}{28292e}
+
+% Define a Code environment to prettily wrap the fontified code.
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=EfD!98!EFD, colframe=EfD!95!EFD,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}
+
+[LISTINGS-SETUP]"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be,
+as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loaded elsewhere).
+- Defines a \"Code\" environment (note the capital C), which all
+  \"Verbatim\" environments (provided by fvextra) will be wrapped with.
+
+In the default value the color \"EFD\" is provided as this is the
+foreground colour provided by engrave-faces-latex.  When there
+are example/fixed-width blocks only, the engraved generated
+preamble is not included, and so it is provided so we may use it
+anyway.
+
+Within this preamble there are two recognised macro-like placeholders:
+
+  [FVEXTRA-SETUP]
+
+  [LISTINGS-SETUP]
+
+FVEXTRA-SETUP sets fvextra's defaults according to
+`org-latex-engraved-options', and LISTINGS-SETUP creates the
+listings environment and defines \\listoflistings."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from the :latex-engraved-preamble and
+:latex-engraved-optionsn export options, the default values of
+which are given by `org-latex-engraved-preamble' and
+`org-latex-engraved-options' respectively."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble (plist-get info :latex-engraved-preamble)))
+    (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
+      (setq engraved-preamble
+            (replace-match
+             (concat
+              "\\fvset{%\n  "
+              (org-latex--make-option-string engraved-options ",\n  ")
+              "}\n")
+             t t
+             engraved-preamble)))
+    (when (string-match "^[ \t]*\\[LISTINGS-SETUP\\][ \t]*\n?" engraved-preamble)
+      (setq engraved-preamble
+            (replace-match
+             (format
+              "%% Support listings with captions
+\\usepackage{float}
+\\floatstyle{%s}
+\\newfloat{listing}{htbp}{lst}
+\\newcommand{\\listingsname}{Listing}
+\\floatname{listing}{\\listingsname}
+\\newcommand{\\listoflistingsname}{List of Listings}
+\\providecommand{\\listoflistings}{\\listof{listing}{\\listoflistingsname}}\n"
+              (if (memq 'src-block org-latex-caption-above)
+                  "plaintop" "plain"))
+             t t
+             engraved-preamble)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1929,17 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (eq org-latex-listings 'engraved)
+       (let ((src-p (org-element-map (plist-get info :parse-tree)
+                        '(src-block inline-src-block) #'identity
+                        info t))
+             (fixedw-p
+              (org-element-map (plist-get info :parse-tree)
+                  '(example-block fixed-width) #'identity
+                  info t)))
+         (when (or src-p fixedw-p)
+           (org-latex-generate-engraved-preamble info src-p))))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2326,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2157,6 +2342,11 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (_info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (format "\\Verb{%s}" (org-latex-src--engrave-code code lang)))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -2323,6 +2513,7 @@ (defun org-latex-keyword (keyword _contents info)
 	  (cl-case (plist-get info :latex-listings)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
+	    (engraved "\\listoflistings")
 	    (otherwise "\\lstlistoflistings")))))))))
 
 
@@ -3017,6 +3208,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3327,88 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src--engrave-code (content lang)
+  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
+  (if (require 'engrave-faces-latex nil t)
+      (let* ((lang-mode (and lang (org-src-get-lang-mode lang)))
+             (engraved-buffer
+              (with-temp-buffer
+                (insert content)
+                (when lang-mode
+                  (if (functionp lang-mode)
+                      (funcall lang-mode)
+                    (message "Cannot engrave code as %s. %s is undefined."
+                             lang lang-mode)))
+                (engrave-faces-latex-buffer)))
+             (engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string))))
+        (kill-buffer engraved-buffer)
+        engraved-code)
+    (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
+
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content
+          (let* ((code-info (org-export-unravel-code src-block))
+                 (max-width
+                  (apply 'max
+                         (mapcar 'string-width
+                                 (org-split-string (car code-info)
+                                                   "\n")))))
+            (org-export-format-code
+             (car code-info)
+             (lambda (loc _num ref)
+               (concat
+                loc
+                (when ref
+                  ;; Ensure references are flushed to the right,
+                  ;; separated with 6 spaces from the widest line
+                  ;; of code.
+                  (concat (make-string (+ (- max-width (length loc)) 6)
+                                       ?\s)
+                          (format "(%s)" ref)))))
+             nil (and retain-labels (cdr code-info)))))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           (org-latex-src--engrave-code content lang))))
+    (format float-env body)))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3


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From 27a83b36b77e267feb3267d6a4dffd16fdf1d5a7 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 13:59:13 +0800
Subject: [PATCH 05/10] ox-latex: Don't use `length' to get string width

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted): Use
`string-width' instead of `length' to gauge the displayed width of the
string in LaTeX.  This may not be a perfect match, but it should be an
improvement.
---
 lisp/ox-latex.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 1f4d4007d..13ba6cd8c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3308,7 +3308,7 @@ (defun org-latex-src-block--minted
            (let* ((code-info (org-export-unravel-code src-block))
                   (max-width
                    (apply 'max
-                          (mapcar 'length
+                          (mapcar 'string-width
                                   (org-split-string (car code-info)
                                                     "\n")))))
              (org-export-format-code
@@ -3460,7 +3460,7 @@ (defun org-latex-src-block--listings
       (let* ((code-info (org-export-unravel-code src-block))
              (max-width
               (apply 'max
-                     (mapcar 'length
+                     (mapcar 'string-width
                              (org-split-string (car code-info) "\n")))))
         (org-export-format-code
          (car code-info)
-- 
2.35.3


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From ce7b8d8d1eafa6f2e6d0e247661000fc5272a24c Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:02:44 +0800
Subject: [PATCH 06/10] ox-latex: Refactor source block transcode fun sigs

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted,
org-latex-src-block--custom): Refactor these --backend functions to use
cl-defun with keys instead of having an 11-argument signature.
(org-latex-src-block): Adjust for the change in signature of the
--backend functions, and refactor the `cond' statement to use `pcase'.
---
 lisp/ox-latex.el | 82 +++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 43 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 13ba6cd8c..4421bb8f5 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3188,37 +3188,37 @@ (defun org-latex-src-block (src-block _contents info)
 contextual information."
   (when (org-string-nw-p (org-element-property :value src-block))
     (let* ((lang (org-element-property :language src-block))
-	   (caption (org-element-property :caption src-block))
-	   (caption-above-p (org-latex--caption-above-p src-block info))
-	   (label (org-element-property :name src-block))
-	   (custom-env (and lang
-			    (cadr (assq (intern lang)
-					org-latex-custom-lang-environments))))
-	   (num-start (org-export-get-loc src-block info))
-	   (retain-labels (org-element-property :retain-labels src-block))
-	   (attributes (org-export-read-attribute :attr_latex src-block))
-	   (float (plist-get attributes :float))
-	   (listings (plist-get info :latex-listings)))
-      (cond
-       ((or (not lang) (not listings))
-        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (custom-env
-        (org-latex-src-block--custom src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float custom-env))
-       ((eq listings 'minted)
-        (org-latex-src-block--minted src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float))
-       ((eq listings 'engraved)
-        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (t
-        (org-latex-src-block--listings src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))))))
-
-(defun org-latex-src-block--verbatim
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels _attributes float)
+           (caption (org-element-property :caption src-block))
+           (caption-above-p (org-latex--caption-above-p src-block info))
+           (label (org-element-property :name src-block))
+           (custom-env (and lang
+                            (cadr (assq (intern lang)
+                                        org-latex-custom-lang-environments))))
+           (num-start (org-export-get-loc src-block info))
+           (retain-labels (org-element-property :retain-labels src-block))
+           (attributes (org-export-read-attribute :attr_latex src-block))
+           (float (plist-get attributes :float))
+           (listings (plist-get info :latex-listings)))
+      (funcall
+       (pcase listings
+         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
+         ((guard custom-env) #'org-latex-src-block--custom)
+         ('minted #'org-latex-src-block--minted)
+         ('engraved #'org-latex-src-block--engraved)
+         (_ #'org-latex-src-block--listings))
+       :src-block src-block
+       :info info
+       :lang lang
+       :caption caption
+       :caption-above-p caption-above-p
+       :label label
+       :num-start num-start
+       :retain-labels retain-labels
+       :attributes attributes
+       :float float))))
+
+(cl-defun org-latex-src-block--verbatim
+    (&key src-block info caption caption-above-p float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3237,9 +3237,8 @@ (defun org-latex-src-block--verbatim
                     (if caption-above-p "" (concat "\n" caption-str))))
           (t verbatim))))
 
-(defun org-latex-src-block--custom
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels attributes float custom-env)
+(cl-defun org-latex-src-block--custom
+    (&key src-block info caption caption-above-p attributes float custom-env &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3259,9 +3258,8 @@ (defun org-latex-src-block--custom
                      (?l . ,(org-latex--label src-block info))
                      (?o . ,(or (plist-get attributes :options) "")))))))
 
-(defun org-latex-src-block--minted
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--minted
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3347,9 +3345,8 @@ (defun org-latex-src--engrave-code (content lang)
         engraved-code)
     (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
 
-(defun org-latex-src-block--engraved
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--engraved
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3409,9 +3406,8 @@ (defun org-latex-src-block--engraved
            (org-latex-src--engrave-code content lang))))
     (format float-env body)))
 
-(defun org-latex-src-block--listings
-    (src-block info lang caption caption-above-p label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--listings
+    (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
-- 
2.35.3


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From 17e91e6816eeeed398a7f2779108e499729005c8 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:46:28 +0800
Subject: [PATCH 07/10] ox-latex: Replace `org-latex-listings'

* lisp/ox-latex.el (org-latex-src-block, org-latex-keyword,
org-latex-inline-src-block, org-latex-template,
org-latex--caption/label-string, org-latex-engraved-preamble,
org-latex-listings): Replace `org-latex-listings' with
`org-latex-src-block-backend', which now can be set to listings/verbatim
and no longer advertises t/nil as valid values.

* lisp/ox-beamer.el (org-beamer-template): Update in the same manner as
`org-latex-template'.

* lisp/org-compat.el: Make `org-latex-listings' an obsolete alias for
`org-latex-src-block-backend'.

* testing/lisp/test-ox.el: Replace `org-latex-listings' reference with
`org-latex-src-block-backend'.

* doc/org-manual.org (Footnotes, LaTeX specific properties, Literal
Examples): Replace references to `org-latex-listings' with
`org-latex-src-block-backend'.

* etc/ORG-NEWS: Add a news entry noting this change.

The variable `org-latex-listings' originally indicated whether source
blocks should use the listings LaTeX package, or not.  This usage has
evolved over the years, and now it sets one of four different
fontification backends.  This renaming should make the variable name a
bit less misleading.
---
 doc/org-manual.org      |   6 +--
 etc/ORG-NEWS            |   9 ++++
 lisp/org-compat.el      |   2 +
 lisp/ox-beamer.el       |   2 +-
 lisp/ox-latex.el        | 111 ++++++++++++++++++++++------------------
 testing/lisp/test-ox.el |   2 +-
 6 files changed, 78 insertions(+), 54 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index c0d38cd8c..60bded419 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -11159,7 +11159,7 @@ ** Literal Examples
 #+end_example
 
 #+cindex: formatting source code, markup rules
-#+vindex: org-latex-listings
+#+vindex: org-latex-src-block-backend
 If the example is source code from a programming language, or any
 other text that can be marked up by Font Lock in Emacs, you can ask
 for the example to look like the fontified Emacs buffer[fn:114].  This
@@ -16304,12 +16304,12 @@ **** LaTeX specific properties
 | ~:latex-link-with-unknown-path-format~ | ~org-latex-link-with-unknown-path-format~ |
 | ~:latex-listings-langs~                | ~org-latex-listings-langs~                |
 | ~:latex-listings-options~              | ~org-latex-listings-options~              |
-| ~:latex-listings~                      | ~org-latex-listings~                      |
 | ~:latex-minted-langs~                  | ~org-latex-minted-langs~                  |
 | ~:latex-minted-options~                | ~org-latex-minted-options~                |
 | ~:latex-prefer-user-labels~            | ~org-latex-prefer-user-labels~            |
 | ~:latex-subtitle-format~               | ~org-latex-subtitle-format~               |
 | ~:latex-subtitle-separate~             | ~org-latex-subtitle-separate~             |
+| ~:latex-src-block-backend~             | ~org-latex-src-block-backend~             |
 | ~:latex-table-scientific-notation~     | ~org-latex-table-scientific-notation~     |
 | ~:latex-tables-booktabs~               | ~org-latex-tables-booktabs~               |
 | ~:latex-tables-centered~               | ~org-latex-tables-centered~               |
@@ -22256,7 +22256,7 @@ * Footnotes
 version 1.34 of the =htmlize.el= package, which you need to install).
 Fontified code chunks in LaTeX can be achieved using either the
 [[https://www.ctan.org/pkg/listings][listings]] package or the [[https://www.ctan.org/pkg/minted][minted]] package.  Refer to
-~org-latex-listings~ for details.
+~org-latex-src-block-backend~ for details.
 
 [fn:115] Source code in code blocks may also be evaluated either
 interactively or on export.  See [[*Working with Source Code]] for more
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 27de6da62..ebb3cd649 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -273,6 +273,15 @@ Chmod-style permissions are based on the new variable
 ~org-babel-tangle-default-file-mode~.
 
 *** A new custom setting =org-agenda-clock-report-header= to add a header to org agenda clock report
+
+*** ~org-latex-listings~ has been replaced with ~org-latex-src-block-backend~
+
+~org-latex-listings~ has been renamed to better reflect the current
+purpose of the variable.  The replacement variable
+~org-latex-src-block-backend~ acts in exactly the same way, however it
+accepts =listings= and =verbatim= in place of =t= and =nil= (which
+still work, but are no longer listed as valid options).
+
 * Version 9.5
 
 ** Important announcements and breaking changes
diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index a29f206a4..704197645 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -324,6 +324,8 @@ (define-obsolete-variable-alias 'org-latex-create-formula-image-program
   'org-preview-latex-default-process "9.0")
 (define-obsolete-variable-alias 'org-latex-preview-ltxpng-directory
   'org-preview-latex-image-directory "9.0")
+(define-obsolete-variable-alias 'org-latex-listings
+  'org-latex-src-block-backend "9.6")
 (define-obsolete-function-alias 'org-table-p 'org-at-table-p "9.0")
 (define-obsolete-function-alias 'org-on-heading-p 'org-at-heading-p "9.0")
 (define-obsolete-function-alias 'org-at-regexp-p 'org-in-regexp "8.3")
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 4d40f6a1d..3baa4e26e 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -858,7 +858,7 @@ (defun org-beamer-template (contents info)
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 4421bb8f5..cc6ac291a 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -143,7 +143,7 @@ (org-export-define-backend 'latex
     (:latex-inactive-timestamp-format nil nil org-latex-inactive-timestamp-format)
     (:latex-inline-image-rules nil nil org-latex-inline-image-rules)
     (:latex-link-with-unknown-path-format nil nil org-latex-link-with-unknown-path-format)
-    (:latex-listings nil nil org-latex-listings)
+    (:latex-src-block-backend nil nil org-latex-src-block-backend)
     (:latex-listings-langs nil nil org-latex-listings-langs)
     (:latex-listings-options nil nil org-latex-listings-options)
     (:latex-minted-langs nil nil org-latex-minted-langs)
@@ -937,22 +937,22 @@ (defcustom org-latex-format-inlinetask-function
 
 ;; Src blocks
 
-(defcustom org-latex-listings nil
-  "Non-nil means export source code using the listings package.
+(defcustom org-latex-src-block-backend 'verbatim
+  "Backend used to generate source code listings.
 
-This package will fontify source code, possibly even with color.
-There are four implementations of this functionality you may
+This sets the behaviour for fontifying source code, possibly even with
+color.  There are four implementations of this functionality you may
 choose from (ordered from least to most capable):
-1. Verbatim (nil)
-2. Listings (t)
-3. Minted (minted)
-4. Engraved (engraved)
+1. Verbatim
+2. Listings
+3. Minted
+4. Engraved
 
 The first two options provide basic syntax
 highlighting (listings), or none at all (verbatim).
 
-When using listings, you also need to make use of the LaTeX
-\"listings\" package. The \"color\" package is also needed if you
+When using listings, you also need to make use of LaTeX package
+\"listings\"e. The \"color\" LaTeX package is also needed if you
 would like color too.  These can simply be added to
 `org-latex-packages-alist', using customise or something like:
 
@@ -963,27 +963,12 @@ (defcustom org-latex-listings nil
 There are two further options for more comprehensive
 fontification. The first can be set with,
 
-  (setq org-latex-listings \\='engraved)
+  (setq org-latex-src-block-backend \\='minted)
 
-which causes source code to be run through
-`engrave-faces-latex-buffer', which generates colorings using
-Emacs' font-lock information.  This requires the engrave-faces
-package (availible from ELPA), and the fvextra LaTeX package be
-installed.
-
-The styling of the engraved result can customised with
-`org-latex-engraved-preamble' and `org-latex-engraved-options'.
-The default preamble also uses the tcolorbox LaTeX package in
-addition to fvextra.
-
-The second more comprehensive option can be set with,
-
-  (setq org-latex-listings \\='minted)
-
-which causes source code to be exported using the minted package
-as opposed to listings.  If you want to use minted, you need to
-add the minted package to `org-latex-packages-alist', for example
-using customize, or with
+which causes source code to be exported using the LaTeX package
+minted as opposed to listings.  If you want to use minted, you
+need to add the minted package to `org-latex-packages-alist', for
+example using customize, or with
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"newfloat\" \"minted\"))
@@ -996,14 +981,29 @@ (defcustom org-latex-listings nil
 The minted choice has possible repercussions on the preview of
 latex fragments (see `org-preview-latex-fragment').  If you run
 into previewing problems, please consult
-URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'."
+URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'.
+
+The most comprehensive option can be set with,
+
+  (setq org-latex-src-block-backend \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the Emacs package
+engrave-faces (availible from ELPA), and the LaTeX package
+fvextra be installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the LaTeX package tcolorbox in
+addition to fvextra."
   :group 'org-export-latex
   :type '(choice
-	  (const :tag "Use listings" t)
+	  (const :tag "Use listings" listings)
 	  (const :tag "Use minted" minted)
 	  (const :tag "Use engrave-faces-latex" engraved)
-	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted engraved))))
+	  (const :tag "Export verbatim" verbatim))
+  :safe (lambda (s) (memq s '(listings minted engraved verbatim))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1203,7 +1203,7 @@ (defcustom org-latex-engraved-preamble
 
 [LISTINGS-SETUP]"
   "Preamble content injected when using engrave-faces-latex for source blocks.
-This is relevant when `org-latex-listings' is set to `engraved'.
+This is relevant when `org-latex-src-block-backend' is set to `engraved'.
 
 There is quite a lot of flexibility in what this preamble can be,
 as long as it:
@@ -1523,7 +1523,8 @@ (defun org-latex--caption/label-string (element info)
 			    main)
 		       (and (eq type 'src-block)
 			    (not (plist-get attr :float))
-			    (null (plist-get info :latex-listings)))))
+			    (memq (plist-get info :latex-src-block-backend)
+                                  '(verbatim nil)))))
 	 (short (org-export-get-caption element t))
 	 (caption-from-attr-latex (plist-get attr :caption)))
     (cond
@@ -1543,7 +1544,8 @@ (defun org-latex--caption/label-string (element info)
 		      (paragraph "figure")
 		      (image "figure")
 		      (special-block "figure")
-		      (src-block (if (plist-get info :latex-listings)
+		      (src-block (if (not (memq (plist-get info :latex-src-block-backend)
+                                                '(verbatim nil)))
 				     "listing"
 				   "figure"))
 		      (t (symbol-name type*)))
@@ -1930,7 +1932,7 @@ (defun org-latex-template (contents info)
        (and (stringp template)
             (format-spec template spec)))
      ;; engrave-faces-latex preamble
-     (when (eq org-latex-listings 'engraved)
+     (when (eq org-latex-src-block-backend 'engraved)
        (let ((src-p (org-element-map (plist-get info :parse-tree)
                         '(src-block inline-src-block) #'identity
                         info t))
@@ -2323,11 +2325,17 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
 contextual information."
   (let ((code (org-element-property :value inline-src-block))
         (lang (org-element-property :language inline-src-block)))
-    (pcase (plist-get info :latex-listings)
-      ('nil (org-latex--text-markup code 'code info))
+    (pcase (plist-get info :latex-src-block-backend)
+      ('verbatim (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
       ('engraved (org-latex-inline-src-block--engraved info code lang))
-      (_ (org-latex-inline-src-block--listings info code lang)))))
+      ('listings (org-latex-inline-src-block--listings info code lang))
+      (oldval
+       (message "Please update the LaTeX src-block-backend to %s"
+                (if oldval "listings" "verbatim"))
+       (if oldval
+           (org-latex-inline-src-block--listings info code lang)
+         (org-latex--text-markup code 'code info))))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using minted.
@@ -2510,7 +2518,7 @@ (defun org-latex-keyword (keyword _contents info)
 	      (concat depth (and depth "\n") "\\tableofcontents"))))
 	 ((string-match-p "\\<tables\\>" value) "\\listoftables")
 	 ((string-match-p "\\<listings\\>" value)
-	  (cl-case (plist-get info :latex-listings)
+	  (cl-case (plist-get info :latex-src-block-backend)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
 	    (engraved "\\listoflistings")
@@ -3197,15 +3205,20 @@ (defun org-latex-src-block (src-block _contents info)
            (num-start (org-export-get-loc src-block info))
            (retain-labels (org-element-property :retain-labels src-block))
            (attributes (org-export-read-attribute :attr_latex src-block))
-           (float (plist-get attributes :float))
-           (listings (plist-get info :latex-listings)))
+           (float (plist-get attributes :float)))
       (funcall
-       (pcase listings
-         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
-         ((guard custom-env) #'org-latex-src-block--custom)
+       (pcase (plist-get info :latex-src-block-backend)
+         ((or 'verbatim (guard (not lang))) #'org-latex-src-block--verbatim)
          ('minted #'org-latex-src-block--minted)
          ('engraved #'org-latex-src-block--engraved)
-         (_ #'org-latex-src-block--listings))
+         ('listings #'org-latex-src-block--listings)
+         ((guard custom-env) #'org-latex-src-block--custom)
+         (oldval
+          (message "Please update the LaTeX src-block-backend to %s"
+                   (if oldval "listings" "verbatim"))
+          (if oldval
+              #'org-latex-src-block--listings
+            #'org-latex-src-block--verbatim)))
        :src-block src-block
        :info info
        :lang lang
diff --git a/testing/lisp/test-ox.el b/testing/lisp/test-ox.el
index 25e02b258..28f950813 100644
--- a/testing/lisp/test-ox.el
+++ b/testing/lisp/test-ox.el
@@ -3978,7 +3978,7 @@ (ert-deftest test-org-export/latex-src-block-verbatim-caption ()
 \\end{verbatim}
 \\caption{Caption is below, 60\\%s}
 \\end{figure*}"
-	     (let ((org-latex-listings 'minted) ; inactive due to missing lang
+	     (let ((org-latex-src-block-backend 'minted) ; inactive due to missing lang
 		   (org-latex-default-figure-position "tp"))
 	       ;; Namely "multicolumn" value to get just figure environment
 	       ;; looks like a bug.
-- 
2.35.3


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From 146146df02434f8b224b21293753f260d0d624b2 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 8 May 2022 02:01:34 +0800
Subject: [PATCH 08/10] ox-latex: Support setting the engraved theme

* lisp/ox-latex.el (org-latex-generate-engraved-preamble,
org-latex-engraved-theme): Introduce the new export keyword
LATEX_ENGRAVED_THEME with default value given by
`org-latex-engraved-theme'.  This is used to set the engraved theme used
in org-latex-engraved-theme.

This bumps the minimum required version of engrave-faces from v0.2 to
v0.3.
---
 lisp/ox-latex.el | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index cc6ac291a..21541e9aa 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -129,6 +129,7 @@ (org-export-define-backend 'latex
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
     (:latex-engraved-options nil nil org-latex-engraved-options)
     (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
+    (:latex-engraved-theme "LATEX_ENGRAVED_THEME" nil org-latex-engraved-theme)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -1267,6 +1268,14 @@ (defcustom org-latex-engraved-options
   :type '(alist :key-type (string :tag "option")
                 :value-type (string :tag "value")))
 
+(defcustom org-latex-engraved-theme nil
+  "The theme that should be used for engraved code, when non-nil.
+This can be set to any theme defined in `engrave-faces-themes' or
+loadable by Emacs.  When set to t, the current Emacs theme is
+used."
+  :group 'org-export-latex
+  :type 'symbol)
+
 (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
   "Generate the preamble to setup engraved code.
 The result is constructed from the :latex-engraved-preamble and
@@ -1275,7 +1284,8 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
 `org-latex-engraved-options' respectively."
   (let* ((engraved-options
           (plist-get info :latex-engraved-options))
-         (engraved-preamble (plist-get info :latex-engraved-preamble)))
+         (engraved-preamble (plist-get info :latex-engraved-preamble))
+         (engraved-theme (plist-get info :latex-engraved-theme)))
     (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
       (setq engraved-preamble
             (replace-match
@@ -1307,7 +1317,8 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
          engraved-preamble
          "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
          (if (require 'engrave-faces-latex nil t)
-             (engrave-faces-latex-gen-preamble)
+             (engrave-faces-latex-gen-preamble
+              (when engraved-theme (intern engraved-theme)))
            (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
            "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
          "\n")
-- 
2.35.3


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From dc4989ccf41f09e7fce08036f89e9274ead4e257 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 8 May 2022 15:28:29 +0800
Subject: [PATCH 09/10] ox-latex: Support setting engraved theme per-block

* lisp/ox-latex.el (org-latex-src-block--engraved,
org-latex-src--engrave-code, org-latex-inline-src-block--engraved,
org-latex-generate-engraved-preamble): Allow for the engraved theme used
to be set on a per-src-block basis with #+attr_latex: :engraved-theme
THEME.  Extra setup code is now generated in
`org-latex-generate-engraved-preamble'.  To facilitate the application
of themes to src blocks, `org-latex-src--engrave-code' now takes on a
larger portion of the transcoding work.
---
 lisp/ox-latex.el | 113 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 89 insertions(+), 24 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 21541e9aa..528243a59 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1285,7 +1285,27 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
   (let* ((engraved-options
           (plist-get info :latex-engraved-options))
          (engraved-preamble (plist-get info :latex-engraved-preamble))
-         (engraved-theme (plist-get info :latex-engraved-theme)))
+         (engraved-theme (plist-get info :latex-engraved-theme))
+         (engraved-themes
+          (cl-delete-duplicates
+           (org-element-map
+               (plist-get info :parse-tree)
+               '(src-block inline-src-block)
+             (lambda (src)
+               (plist-get
+                (org-export-read-attribute :attr_latex src)
+                :engraved-theme))
+             info)))
+         (gen-theme-spec
+          (lambda (theme)
+            (if (eq engrave-faces-latex-output-style 'preset)
+                (engrave-faces-latex-gen-preamble (when theme (intern theme)))
+              (engrave-faces-latex-gen-preamble-line
+               'default
+               (alist-get 'default
+                          (if theme
+                              (engrave-faces-get-theme (intern theme))
+                            engrave-faces-current-preset-style)))))))
     (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
       (setq engraved-preamble
             (replace-match
@@ -1315,10 +1335,31 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
         (concat
          "\n% Setup for code blocks [1/2]\n\n"
          engraved-preamble
-         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n\n"
          (if (require 'engrave-faces-latex nil t)
-             (engrave-faces-latex-gen-preamble
-              (when engraved-theme (intern engraved-theme)))
+             (if engraved-themes
+                 (concat
+                  (mapconcat
+                   (lambda (theme)
+                     (format
+                      "\n\\newcommand{\\engravedtheme%s}{%%\n%s\n}"
+                      (replace-regexp-in-string "[^A-Za-z]" "" theme)
+                      (replace-regexp-in-string
+                       "newcommand" "renewcommand"
+                       (replace-regexp-in-string
+                        "#" "##"
+                        (funcall gen-theme-spec theme)))))
+                   engraved-themes
+                   "\n")
+                  "\n\n"
+                  (cond
+                   ((memq engraved-theme engraved-themes)
+                    (concat "\\engravedtheme"
+                            (replace-regexp-in-string
+                             "[^A-Za-z]" "" engraved-theme)
+                            "\n"))
+                   (t (funcall gen-theme-spec engraved-theme))))
+               (funcall gen-theme-spec engraved-theme))
            (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
            "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
          "\n")
@@ -2361,10 +2402,11 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
-(defun org-latex-inline-src-block--engraved (_info code lang)
+(defun org-latex-inline-src-block--engraved (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
-  (format "\\Verb{%s}" (org-latex-src--engrave-code code lang)))
+  (org-latex-src--engrave-code
+   code lang nil (plist-get info :latex-engraved-options) t))
 
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
@@ -3349,13 +3391,18 @@ (cl-defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
-(defun org-latex-src--engrave-code (content lang)
-  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
+(defun org-latex-src--engrave-code (content lang &optional theme options inline)
+  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
+When THEME is non-nil, it will be used."
   (if (require 'engrave-faces-latex nil t)
       (let* ((lang-mode (and lang (org-src-get-lang-mode lang)))
+             (engrave-faces-current-preset-style
+              (if theme
+                  (engrave-faces-get-theme theme)
+                engrave-faces-current-preset-style))
              (engraved-buffer
               (with-temp-buffer
-                (insert content)
+                (insert (string-trim-right content "\n"))
                 (when lang-mode
                   (if (functionp lang-mode)
                       (funcall lang-mode)
@@ -3364,9 +3411,27 @@ (defun org-latex-src--engrave-code (content lang)
                 (engrave-faces-latex-buffer)))
              (engraved-code
               (with-current-buffer engraved-buffer
-                (buffer-string))))
+                (buffer-string)))
+             (engraved-options
+              (when options
+                (concat "["
+                        (if (listp options)
+                            (org-latex--make-option-string options)
+                          options)
+                        "]")))
+             (engraved-wrapped
+              (if inline
+                  (concat "\\Verb" engraved-options "{" engraved-code "}")
+                (concat "\\begin{Code}\\begin{Verbatim}" engraved-options "\n"
+                        engraved-code "\n\\end{Verbatim}\n\\end{Code}"))))
         (kill-buffer engraved-buffer)
-        engraved-code)
+        (if theme
+            (concat "{\\engravedtheme"
+                    (replace-regexp-in-string "[^A-Za-z]" ""
+                                              (symbol-name theme))
+                    engraved-wrapped
+                    "}")
+          engraved-wrapped))
     (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
 
 (cl-defun org-latex-src-block--engraved
@@ -3394,7 +3459,15 @@ (cl-defun org-latex-src-block--engraved
                             placement)
                     "%s\n\\end{listing}"))
            (t "%s")))
-         (options (plist-get info :latex-engraved-options))
+         (options
+          (let ((engraved-options (plist-get info :latex-engraved-options))
+                (local-options (plist-get attributes :options)))
+            (append
+             (when (and num-start (not (assoc "linenos" engraved-options)))
+               `(("linenos")
+                 ("firstnumber" ,(number-to-string (1+ num-start)))))
+             (and local-options (list local-options)))))
+         (engraved-theme (plist-get attributes :engraved-theme))
          (content
           (let* ((code-info (org-export-unravel-code src-block))
                  (max-width
@@ -3416,18 +3489,10 @@ (cl-defun org-latex-src-block--engraved
                           (format "(%s)" ref)))))
              nil (and retain-labels (cdr code-info)))))
          (body
-          (format
-           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
-           ;; Options.
-           (concat
-            (org-latex--make-option-string
-             (append
-              (when (and num-start (not (assoc "linenos" options)))
-                `(("linenos")
-                  ("firstnumber" ,(number-to-string (1+ num-start)))))
-              (let ((local-options (plist-get attributes :options)))
-                (and local-options (list local-options))))))
-           (org-latex-src--engrave-code content lang))))
+          (org-latex-src--engrave-code
+           content lang
+           (when engraved-theme (intern engraved-theme))
+           options)))
     (format float-env body)))
 
 (cl-defun org-latex-src-block--listings
-- 
2.35.3


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From ec560f6f037b902d603e9f34bbe593cb4c6bf4a9 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Mon, 9 May 2022 00:04:10 +0800
Subject: [PATCH 10/10] ox-latex: Fix %-captions in minted/engraved code

* lisp/ox-latex.el (org-latex-src-block--engraved,
org-latex-src-block--minted): Refactor float-env to be clearer, and
switch from `format' to `concat' to fix the bug where %-chars in
captions are interpreted as a format specifier.
---
 lisp/ox-latex.el | 55 +++++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 31 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 528243a59..bb8072230 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3332,23 +3332,20 @@ (cl-defun org-latex-src-block--minted
   (let* ((caption-str (org-latex--caption/label-string src-block info))
          (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
                         (plist-get info :latex-default-figure-position)))
+         (multicolumn-p (string= "multicolumn" float))
          (float-env
           (cond
-           ((string= "multicolumn" float)
-            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
-           (caption
-            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
+           ((or caption multicolumn-p)
+            (cons
+             (concat "\\begin{listing" (when multicolumn-p "*")
+                     "}[" placement "]\n"
+                     (if caption-above-p caption-str ""))
+             (concat "\n" (if caption-above-p "" caption-str)
+                     "\\end{listing" (when multicolumn-p "*") "}")))
            ((string= "t" float)
-            (concat (format "\\begin{listing}[%s]\n"
-                            placement)
-                    "%s\n\\end{listing}"))
-           (t "%s")))
+            (cons
+             (concat "\\begin{listing}[" placement "]\n")
+             "\n\\end{listing}"))))
          (options (plist-get info :latex-minted-options))
          (body
           (format
@@ -3388,8 +3385,7 @@ (cl-defun org-latex-src-block--minted
                                         ?\s)
                            (format "(%s)" ref)))))
               nil (and retain-labels (cdr code-info)))))))
-    ;; Return value.
-    (format float-env body)))
+    (concat (car float-env) body (cdr float-env))))
 
 (defun org-latex-src--engrave-code (content lang &optional theme options inline)
   "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
@@ -3442,23 +3438,20 @@ (cl-defun org-latex-src-block--engraved
   (let* ((caption-str (org-latex--caption/label-string src-block info))
          (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
                         (plist-get info :latex-default-figure-position)))
+         (multicolumn-p (string= "multicolumn" float))
          (float-env
           (cond
-           ((string= "multicolumn" float)
-            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
-           (caption
-            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
+           ((or caption multicolumn-p)
+            (cons
+             (concat "\\begin{listing" (when multicolumn-p "*")
+                     "}[" placement "]\n"
+                     (if caption-above-p caption-str ""))
+             (concat "\n" (if caption-above-p "" caption-str)
+                     "\\end{listing" (when multicolumn-p "*") "}")))
            ((string= "t" float)
-            (concat (format "\\begin{listing}[%s]\n"
-                            placement)
-                    "%s\n\\end{listing}"))
-           (t "%s")))
+            (cons
+             (concat "\\begin{listing}[" placement "]\n")
+             "\n\\end{listing}"))))
          (options
           (let ((engraved-options (plist-get info :latex-engraved-options))
                 (local-options (plist-get attributes :options)))
@@ -3493,7 +3486,7 @@ (cl-defun org-latex-src-block--engraved
            content lang
            (when engraved-theme (intern engraved-theme))
            options)))
-    (format float-env body)))
+    (concat (car float-env) body (cdr float-env))))
 
 (cl-defun org-latex-src-block--listings
     (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
-- 
2.35.3

Re: [PATCH] (v2) New LaTeX code export option: engraved

[Ihor Radchenko]

Timothy <tecosaur@gmail.com> writes:

> I have a new set of patches (attached), which make use of a major new feature in
> engrave-faces v0.3: engraved themes.

Thanks!

> Glad to hear you’ve been able to have a look over the patches. With the feedback
> I’ve received here so far, if no issues come up in the next few days I’m
> inclined to merge this, add documentation, and see what feedback pops
> up.

Before merging, could you also try to implement tests at least for
engraved feature? If I recall correctly, we do not currently have
backend-specific tests. But it would certainly help if we did. You might
as well write a small "nucleus" test for ox-latex.

Also, unless I miss something, there is no support for coderefs in the
patchset. Is it intentional?

> +(defun org-latex-src-block--verbatim
> ...
> +  (let ((caption-str (org-latex--caption/label-string src-block info))

> +(defun org-latex-src-block--custom
> ...
> +  (let ((caption-str (org-latex--caption/label-string src-block info))
> +        (formatted-src (org-export-format-code-default src-block info)))

It appears that the code for caption-str is duplicated.  It could be
also factored out.

> +      (format-spec custom-env
> +                   `((?s . ,formatted-src)
> +                     (?c . ,caption)
> +                     (?f . ,float)
> +                     (?l . ,(org-latex--label src-block info))
> +                     (?o . ,(or (plist-get attributes :options) "")))))))

I do not see a definition of `format-spec' function. There is only
`spec' above in the code. Can you double check? Either I am missing
something or something fishy is going on.

> +  (let ((code (org-element-property :value inline-src-block))
> +        (lang (org-element-property :language inline-src-block)))
> +    (pcase (plist-get info :latex-listings)
> +      ('nil (org-latex--text-markup code 'code info))
> +      ('minted (org-latex-inline-src-block--minted info code lang))
> +      (_ (org-latex-inline-src-block--listings info code lang)))))

Please use `nil and `minted.  Using ' may create issues in older Emacs.

> +% In case engrave-faces-latex-gen-preamble has not been run.
> +\\providecolor{EfD}{HTML}{f7f7f7}
> +\\providecolor{EFD}{HTML}{28292e}

What is the difference between EfD and EFD? EfD is also not documented.


> +FVEXTRA-SETUP sets fvextra's defaults according to
> +`org-latex-engraved-options', and LISTINGS-SETUP creates the
> +listings environment and defines \\listoflistings."

It is unclear what listings environment does given that we use engraved
package. Can you provide a bit more details in the docstring on what the
user will get if [LISTINGS-SETUP] is present.
It may catch users by surprise that deleting this will make captions
disappear.

> @@ -1756,6 +1929,17 @@ (defun org-latex-template (contents info)
>       (let ((template (plist-get info :latex-hyperref-template)))
>         (and (stringp template)
>              (format-spec template spec)))
> +     ;; engrave-faces-latex preamble
> +     (when (eq org-latex-listings 'engraved)
> +       (let ((src-p (org-element-map (plist-get info :parse-tree)
> +                        '(src-block inline-src-block) #'identity
> +                        info t))
> +             (fixedw-p
> +              (org-element-map (plist-get info :parse-tree)
> +                  '(example-block fixed-width) #'identity
> +                  info t)))
> +         (when (or src-p fixedw-p)
> +           (org-latex-generate-engraved-preamble info src-p))))

Why not just
(org-element-map (plist-get info :parse-tree)
                        '(src-block inline-src-block example-block fixed-width) #'identity
                        info t)
?

>      (pcase (plist-get info :latex-listings)
>        ('nil (org-latex--text-markup code 'code info))
>        ('minted (org-latex-inline-src-block--minted info code lang))
> +      ('engraved (org-latex-inline-src-block--engraved info code lang))
>        (_ (org-latex-inline-src-block--listings info code lang)))))

Same comment about ` in pcase.
  
>  (defun org-latex-inline-src-block--listings (info code lang)
>    "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
>  INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
> @@ -2323,6 +2513,7 @@ (defun org-latex-keyword (keyword _contents info)
>  	  (cl-case (plist-get info :latex-listings)
>  	    ((nil) "\\listoffigures")
>  	    (minted "\\listoflistings")
> +	    (engraved "\\listoflistings")
>  	    (otherwise "\\lstlistoflistings")))))))))

What will happen if there is no [LISTINGS-SETUP]?

> +(defcustom org-latex-engraved-theme nil
> +  "The theme that should be used for engraved code, when non-nil.
> +This can be set to any theme defined in `engrave-faces-themes' or
> +loadable by Emacs.  When set to t, the current Emacs theme is
> +used."
> +  :group 'org-export-latex
> +  :type 'symbol)

Docstring does not explain what happens when set to nil.
Also, does :type 'symbol allow t and nil?

> -             (engrave-faces-latex-gen-preamble)
> +             (engrave-faces-latex-gen-preamble
> +              (when engraved-theme (intern engraved-theme)))

Will it work when engraved-theme is t?

> -         (engraved-theme (plist-get info :latex-engraved-theme)))
> +         (engraved-theme (plist-get info :latex-engraved-theme))
> +         (engraved-themes
> +          (cl-delete-duplicates
> +           (org-element-map
> +               (plist-get info :parse-tree)
> +               '(src-block inline-src-block)
> +             (lambda (src)
> +               (plist-get
> +                (org-export-read-attribute :attr_latex src)
> +                :engraved-theme))
> +             info)))

What about example-block and fixed-width? I may be missing something,
but earlier in the patchset you had conditionals of the type
(or src-p fixedw-p). So, does engrave-faces do anything with fixedw-type
elements?

> +         (gen-theme-spec
> +          (lambda (theme)
> +            (if (eq engrave-faces-latex-output-style 'preset)
> +                (engrave-faces-latex-gen-preamble (when theme (intern theme)))
> +              (engrave-faces-latex-gen-preamble-line
> +               'default
> +               (alist-get 'default
> +                          (if theme
> +                              (engrave-faces-get-theme (intern theme))
> +                            engrave-faces-current-preset-style)))))))

This appears to be not guarded by (require 'engrave-faces-latex nil t).

> -(defun org-latex-src--engrave-code (content lang)
> -  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
> +(defun org-latex-src--engrave-code (content lang &optional theme options inline)
> +  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
> +When THEME is non-nil, it will be used."

You did not document the remaining two arguments. (this makes me ask a
question whether you checked compile warnings). Also, consider running
M-x checkdoc on ox-latex.el.

> -                (insert content)
> +                (insert (string-trim-right content "\n"))

As a theoretical possibility, what will happen if content has something
like "%\n"?

Best,
Ihor

Re: [PATCH] (v2) New LaTeX code export option: engraved

[Timothy]

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Hi Ihor,

> Before merging, could you also try to implement tests at least for
> engraved feature? If I recall correctly, we do not currently have
> backend-specific tests. But it would certainly help if we did. You might
> as well write a small “nucleus” test for ox-latex.

Probably not a bad idea, I’m just not sure what/how I’d go about this.

> Also, unless I miss something, there is no support for coderefs in the
> patchset. Is it intentional?

I think you’ve missed something. It has the same coderefs support as minted.

> It appears that the code for caption-str is duplicated.  It could be
> also factored out.

It could, but I’m not sure this is actually a good idea as the duplication is
more the result of chance than a common dependency.

>> +      (format-spec custom-env
>> +                   `((?s . ,formatted-src)
>> +                     (?c . ,caption)
>> +                     (?f . ,float)
>> +                     (?l . ,(org-latex–label src-block info))
>> +                     (?o . ,(or (plist-get attributes :options) “”)))))))
>
> I do not see a definition of `format-spec’ function. There is only
> `spec’ above in the code. Can you double check? Either I am missing
> something or something fishy is going on.

This code isn’t introduced by my patches, just relocated. FWIW `format-spec' is
provided by Emacs, and I don’t think is new.

>> +  (let ((code (org-element-property :value inline-src-block))
>> +        (lang (org-element-property :language inline-src-block)))
>> +    (pcase (plist-get info :latex-listings)
>> +      (’nil (org-latex–text-markup code ’code info))
>> +      (’minted (org-latex-inline-src-block–minted info code lang))
>> +      (_ (org-latex-inline-src-block–listings info code lang)))))
>
> Please use `nil and `minted.  Using ’ may create issues in older Emacs.

Done.

>> +% In case engrave-faces-latex-gen-preamble has not been run.
>> +\
>> +\
>
> What is the difference between EfD and EFD? EfD is also not documented.

Documentation added. EfD is the background colour.

>> +FVEXTRA-SETUP sets fvextra’s defaults according to
>> +`org-latex-engraved-options’, and LISTINGS-SETUP creates the
>> +listings environment and defines \.“
>
> It is unclear what listings environment does given that we use engraved
> package. Can you provide a bit more details in the docstring on what the
> user will get if [LISTINGS-SETUP] is present.
> It may catch users by surprise that deleting this will make captions
> disappear.

It does the same thing as minted’s `listings' environment, hence the choice of
name. Documentation added.

> Why not just
> (org-element-map (plist-get info :parse-tree)
>                         ’(src-block inline-src-block example-block fixed-width) #’identity
>                         info t)

Ah, in my config I’m also using some engraved info for example/fixed-width
blocks. I’ll leave this out for now.

>>      (pcase (plist-get info :latex-listings)
>>        (’nil (org-latex–text-markup code ’code info))
>>        …
> Same comment about ` in pcase.

Done.

> What will happen if there is no [LISTINGS-SETUP]?

Captioned/Floating code blocks won’t work.

>> +(defcustom org-latex-engraved-theme nil
> Docstring does not explain what happens when set to nil.
> Also, does :type ’symbol allow t and nil?

I think so, `symbolp' says they’re symbols if nothing else.

> Will it work when engraved-theme is t?

Yes.

> What about example-block and fixed-width? I may be missing something,
> but earlier in the patchset you had conditionals of the type
> (or src-p fixedw-p). So, does engrave-faces do anything with fixedw-type
> elements?

Resolved earlier.

>> +         (gen-theme-spec
>> +          (lambda (theme) …
>
> This appears to be not guarded by (require ’engrave-faces-latex nil t).

It is before it’s actually called.

>> -(defun org-latex-src–engrave-code (content lang)
>> -  “Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.”
>> +(defun org-latex-src–engrave-code (content lang &optional theme options inline)
>> +  “Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
>> +When THEME is non-nil, it will be used.”
>
> You did not document the remaining two arguments. (this makes me ask a
> question whether you checked compile warnings). Also, consider running
> M-x checkdoc on ox-latex.el.

Now documented.

I have checked compile warnings (there are none), but checkdoc is currently a
bit dodgy on the Emacs commit I’m on.

>> -                (insert content)
>> +                (insert (string-trim-right content “”))
>
> As a theoretical possibility, what will happen if content has something
> like “%”?

Discussed in DMs. It just gets rid of trailing newlines, and it’s fine with
escaping.

All the best,
Timothy

Re: [PATCH] (v2) New LaTeX code export option: engraved

[Max Nikulin]

On 09/05/2022 19:57, Timothy wrote:
> 
>> Before merging, could you also try to implement tests at least for
>> engraved feature? If I recall correctly, we do not currently have
>> backend-specific tests. But it would certainly help if we did. You might
>> as well write a small “nucleus” test for ox-latex.
> 
> Probably not a bad idea, I’m just not sure what/how I’d go about this.

Have a look at `test-org-export/latex-src-block-verbatim-caption' in 
testing/lisp/test-ox.el Implementation is not perfect though.

P.S. Feel free to ignore the following case. It is more related to 
#+begin_example block, but since it is too rigid, maybe it could be 
handled by #+begin_src with custom environment just to pass option 
argument to \begin{verbatim}. It may be considered as a probe if the 
code after refactoring is flexible enough to handle close use cases.

Pedro Andres Aranda Gutierrez to emacs-orgmode. A question/bug report(?) 
Wed, 30 Mar 2022 07:14:54 +0200. 
https://list.orgmode.org/CAO48Bk_dJs1=5zgpcZwODaTsRqyRsKq1ALj6WpaXCc4bDjW3FQ@mail.gmail.com

Re: [PATCH] (v2) New LaTeX code export option: engraved

[Ihor Radchenko]

Timothy <tecosaur@gmail.com> writes:

Thanks for the replies. I consider all but one as resolved.

>> What will happen if there is no [LISTINGS-SETUP]?
>
> Captioned/Floating code blocks won’t work.

Can you also add this to the documentation of the preamble variable?
Otherwise, it may not be very clear what inclusion/removal of
[LISTINGS-SETUP] does.

Best,
Ihor

Re: [PATCH] (v3) New LaTeX code export option: engraved

[Timothy]

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Hi All,

I now have what I hope is the final set of patches[1].

Compared to v2 we have:
• a fix for % in captions (long standing bug)
• support for mathescaped code
• a news/manual entry for engraved
• a collection of tweaks based on Ihor’s lovely feedback 🤗

I’ve also slipped in a patch to `org-latex--label' which adds the `lst:' prefix
(short for listings) to `\label's generated for source blocks. This seemed like a
decent idea while I was working on captions, if anyone thinks otherwise I’ll
happily leave it out.

Daniel, if you’re happy with these commits let me know and I’ll push them :)

All the best,
Timothy



Footnotes
─────────

[1] For getting this feature
into Org. I’m sure there will be tweaks in the future.

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 0001-ox-latex-Refactor-org-latex-src-block.patch --]
[-- Type: text/x-patch, Size: 15944 bytes --]

From 18adbd0e1226cf3307090861e09e92bfa9cdfbf1 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 14:35:34 +0800
Subject: [PATCH 01/13] ox-latex: Refactor `org-latex-src-block'

* lisp/ox-latex.el (org-latex-src-block): Extract the per-format logic
from `org-latex-src-block' into new dedicated functions:
+ `org-latex-src-block--verbatim'
+ `org-latex-src-block--custom'
+ `org-latex-src-block--minted'
+ `org-latex-src-block--listings'
This makes `org-latex-src-block' much less monolithic, taking it from
175 lines to 30, and I find also makes it easier to understand.
---
 lisp/ox-latex.el | 339 ++++++++++++++++++++++++++---------------------
 1 file changed, 185 insertions(+), 154 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 841ad48bc..c2f728a1c 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2997,164 +2997,195 @@ (defun org-latex-src-block (src-block _contents info)
 	   (float (plist-get attributes :float))
 	   (listings (plist-get info :latex-listings)))
       (cond
-       ;; Case 1.  No source fontification.
        ((or (not lang) (not listings))
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
-                                (org-export-format-code-default src-block info))))
-          (cond ((string= "multicolumn" float)
-                 (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
-                         (plist-get info :latex-default-figure-position)
-                         (if caption-above-p caption-str "")
-                         verbatim
-                         (if caption-above-p "" caption-str)))
-                (caption (concat
-                          (if caption-above-p caption-str "")
-                          verbatim
-                          (if caption-above-p "" (concat "\n" caption-str))))
-                (t verbatim))))
-       ;; Case 2.  Custom environment.
+        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (custom-env
-	(let ((caption-str (org-latex--caption/label-string src-block info))
-              (formatted-src (org-export-format-code-default src-block info)))
-          (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
-	      (format "\\begin{%s}\n%s\\end{%s}\n"
-		      custom-env
-		      (concat (and caption-above-p caption-str)
-			      formatted-src
-			      (and (not caption-above-p) caption-str))
-		      custom-env)
-	    (format-spec custom-env
-			 `((?s . ,formatted-src)
-			   (?c . ,caption)
-			   (?f . ,float)
-			   (?l . ,(org-latex--label src-block info))
-			   (?o . ,(or (plist-get attributes :options) "")))))))
-       ;; Case 3.  Use minted package.
+        (org-latex-src-block--custom src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
-	(let* ((caption-str (org-latex--caption/label-string src-block info))
-	       (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
-			      (plist-get info :latex-default-figure-position)))
-	       (float-env
-		(cond
-		 ((string= "multicolumn" float)
-		  (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 (caption
-		  (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-			  placement
-			  (if caption-above-p caption-str "")
-			  (if caption-above-p "" caption-str)))
-		 ((string= "t" float)
-		  (concat (format "\\begin{listing}[%s]\n"
-				  placement)
-			  "%s\n\\end{listing}"))
-		 (t "%s")))
-	       (options (plist-get info :latex-minted-options))
-	       (body
-		(format
-		 "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
-		 ;; Options.
-		 (concat
-		  (org-latex--make-option-string
-		   (if (or (not num-start) (assoc "linenos" options))
-		       options
-		     (append
-		      `(("linenos")
-			("firstnumber" ,(number-to-string (1+ num-start))))
-		      options)))
-		  (let ((local-options (plist-get attributes :options)))
-		    (and local-options (concat "," local-options))))
-		 ;; Language.
-		 (or (cadr (assq (intern lang)
-				 (plist-get info :latex-minted-langs)))
-		     (downcase lang))
-		 ;; Source code.
-		 (let* ((code-info (org-export-unravel-code src-block))
-			(max-width
-			 (apply 'max
-				(mapcar 'length
-					(org-split-string (car code-info)
-							  "\n")))))
-		   (org-export-format-code
-		    (car code-info)
-		    (lambda (loc _num ref)
-		      (concat
-		       loc
-		       (when ref
-			 ;; Ensure references are flushed to the right,
-			 ;; separated with 6 spaces from the widest line
-			 ;; of code.
-			 (concat (make-string (+ (- max-width (length loc)) 6)
-					      ?\s)
-				 (format "(%s)" ref)))))
-		    nil (and retain-labels (cdr code-info)))))))
-	  ;; Return value.
-	  (format float-env body)))
-       ;; Case 4.  Use listings package.
+        (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))
        (t
-	(let ((lst-lang
-	       (or (cadr (assq (intern lang)
-			       (plist-get info :latex-listings-langs)))
-		   lang))
-	      (caption-str
-	       (when caption
-		 (let ((main (org-export-get-caption src-block))
-		       (secondary (org-export-get-caption src-block t)))
-		   (if (not secondary)
-		       (format "{%s}" (org-export-data main info))
-		     (format "{[%s]%s}"
-			     (org-export-data secondary info)
-			     (org-export-data main info))))))
-	      (lst-opt (plist-get info :latex-listings-options)))
-	  (concat
-	   ;; Options.
-	   (format
-	    "\\lstset{%s}\n"
-	    (concat
-	     (org-latex--make-option-string
-	      (append
-	       lst-opt
-	       (cond
-		((and (not float) (plist-member attributes :float)) nil)
-		((string= "multicolumn" float) '(("float" "*")))
-		((and float (not (assoc "float" lst-opt)))
-		 `(("float" ,(plist-get info :latex-default-figure-position)))))
-	       `(("language" ,lst-lang))
-	       (if label
-		   `(("label" ,(org-latex--label src-block info)))
-		 '(("label" " ")))
-	       (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
-	       `(("captionpos" ,(if caption-above-p "t" "b")))
-	       (cond ((assoc "numbers" lst-opt) nil)
-		     ((not num-start) '(("numbers" "none")))
-		     (t `(("firstnumber" ,(number-to-string (1+ num-start)))
-			  ("numbers" "left"))))))
-	     (let ((local-options (plist-get attributes :options)))
-	       (and local-options (concat "," local-options)))))
-	   ;; Source code.
-	   (format
-	    "\\begin{lstlisting}\n%s\\end{lstlisting}"
-	    (let* ((code-info (org-export-unravel-code src-block))
-		   (max-width
-		    (apply 'max
-			   (mapcar 'length
-				   (org-split-string (car code-info) "\n")))))
-	      (org-export-format-code
-	       (car code-info)
-	       (lambda (loc _num ref)
-		 (concat
-		  loc
-		  (when ref
-		    ;; Ensure references are flushed to the right,
-		    ;; separated with 6 spaces from the widest line of
-		    ;; code
-		    (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
-			    (format "(%s)" ref)))))
-	       nil (and retain-labels (cdr code-info))))))))))))
-
+        (org-latex-src-block--listings src-block info lang caption caption-above-p label
+                                       num-start retain-labels attributes float))))))
+
+(defun org-latex-src-block--verbatim
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels _attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (verbatim (format "\\begin{verbatim}\n%s\\end{verbatim}"
+                          (org-export-format-code-default src-block info))))
+    (cond ((string= "multicolumn" float)
+           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"
+                   (plist-get info :latex-default-figure-position)
+                   (if caption-above-p caption-str "")
+                   verbatim
+                   (if caption-above-p "" caption-str)))
+          (caption (concat
+                    (if caption-above-p caption-str "")
+                    verbatim
+                    (if caption-above-p "" (concat "\n" caption-str))))
+          (t verbatim))))
+
+(defun org-latex-src-block--custom
+    (src-block info _lang caption caption-above-p _label
+               _num-start _retain-labels attributes float custom-env)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((caption-str (org-latex--caption/label-string src-block info))
+        (formatted-src (org-export-format-code-default src-block info)))
+    (if (string-match-p "\\`[a-zA-Z0-9]+\\'" custom-env)
+        (format "\\begin{%s}\n%s\\end{%s}\n"
+                custom-env
+                (concat (and caption-above-p caption-str)
+                        formatted-src
+                        (and (not caption-above-p) caption-str))
+                custom-env)
+      (format-spec custom-env
+                   `((?s . ,formatted-src)
+                     (?c . ,caption)
+                     (?f . ,float)
+                     (?l . ,(org-latex--label src-block info))
+                     (?o . ,(or (plist-get attributes :options) "")))))))
+
+(defun org-latex-src-block--minted
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-minted-options))
+         (body
+          (format
+           "\\begin{minted}[%s]{%s}\n%s\\end{minted}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (if (or (not num-start) (assoc "linenos" options))
+                 options
+               (append
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start))))
+                options)))
+            (let ((local-options (plist-get attributes :options)))
+              (and local-options (concat "," local-options))))
+           ;; Language.
+           (or (cadr (assq (intern lang)
+                           (plist-get info :latex-minted-langs)))
+               (downcase lang))
+           ;; Source code.
+           (let* ((code-info (org-export-unravel-code src-block))
+                  (max-width
+                   (apply 'max
+                          (mapcar 'length
+                                  (org-split-string (car code-info)
+                                                    "\n")))))
+             (org-export-format-code
+              (car code-info)
+              (lambda (loc _num ref)
+                (concat
+                 loc
+                 (when ref
+                   ;; Ensure references are flushed to the right,
+                   ;; separated with 6 spaces from the widest line
+                   ;; of code.
+                   (concat (make-string (+ (- max-width (length loc)) 6)
+                                        ?\s)
+                           (format "(%s)" ref)))))
+              nil (and retain-labels (cdr code-info)))))))
+    ;; Return value.
+    (format float-env body)))
+
+(defun org-latex-src-block--listings
+    (src-block info lang caption caption-above-p label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let ((lst-lang
+         (or (cadr (assq (intern lang)
+                         (plist-get info :latex-listings-langs)))
+             lang))
+        (caption-str
+         (when caption
+           (let ((main (org-export-get-caption src-block))
+                 (secondary (org-export-get-caption src-block t)))
+             (if (not secondary)
+                 (format "{%s}" (org-export-data main info))
+               (format "{[%s]%s}"
+                       (org-export-data secondary info)
+                       (org-export-data main info))))))
+        (lst-opt (plist-get info :latex-listings-options)))
+    (concat
+     ;; Options.
+     (format
+      "\\lstset{%s}\n"
+      (concat
+       (org-latex--make-option-string
+        (append
+         lst-opt
+         (cond
+          ((and (not float) (plist-member attributes :float)) nil)
+          ((string= "multicolumn" float) '(("float" "*")))
+          ((and float (not (assoc "float" lst-opt)))
+           `(("float" ,(plist-get info :latex-default-figure-position)))))
+         `(("language" ,lst-lang))
+         (if label
+             `(("label" ,(org-latex--label src-block info)))
+           '(("label" " ")))
+         (if caption-str `(("caption" ,caption-str)) '(("caption" " ")))
+         `(("captionpos" ,(if caption-above-p "t" "b")))
+         (cond ((assoc "numbers" lst-opt) nil)
+               ((not num-start) '(("numbers" "none")))
+               (t `(("firstnumber" ,(number-to-string (1+ num-start)))
+                    ("numbers" "left"))))))
+       (let ((local-options (plist-get attributes :options)))
+         (and local-options (concat "," local-options)))))
+     ;; Source code.
+     (format
+      "\\begin{lstlisting}\n%s\\end{lstlisting}"
+      (let* ((code-info (org-export-unravel-code src-block))
+             (max-width
+              (apply 'max
+                     (mapcar 'length
+                             (org-split-string (car code-info) "\n")))))
+        (org-export-format-code
+         (car code-info)
+         (lambda (loc _num ref)
+           (concat
+            loc
+            (when ref
+              ;; Ensure references are flushed to the right,
+              ;; separated with 6 spaces from the widest line of
+              ;; code
+              (concat (make-string (+ (- max-width (length loc)) 6) ?\s)
+                      (format "(%s)" ref)))))
+         nil (and retain-labels (cdr code-info))))))))
 
 ;;;; Statistics Cookie
 
-- 
2.35.3


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From 6635b72356192c3b0be500984b327d0b4ebd8e2b Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 18:53:10 +0800
Subject: [PATCH 02/13] ox-latex: Refactor `org-latex-inline-src-block'

* lisp/ox-latex.el (org-latex-inline-src-block,
org-latex-inline-src-block--minted,
org-latex-inline-src-block--listings): Extract the minted and listings
specific logic out of `org-latex-inline-src-block` into the new
functions `org-latex-inline-src-block--minted` and
`org-latex-inline-src-block--listings`.
---
 lisp/ox-latex.el | 62 +++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 30 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index c2f728a1c..38f36a1f3 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -2127,36 +2127,38 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
   "Transcode an INLINE-SRC-BLOCK element from Org to LaTeX.
 CONTENTS holds the contents of the item.  INFO is a plist holding
 contextual information."
-  (let* ((code (org-element-property :value inline-src-block))
-	 (separator (org-latex--find-verb-separator code)))
-    (cl-case (plist-get info :latex-listings)
-      ;; Do not use a special package: transcode it verbatim, as code.
-      ((nil) (org-latex--text-markup code 'code info))
-      ;; Use minted package.
-      (minted
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (mint-lang (or (cadr (assq (intern org-lang)
-					 (plist-get info :latex-minted-langs)))
-			     (downcase org-lang)))
-	      (options (org-latex--make-option-string
-			(plist-get info :latex-minted-options))))
-	 (format "\\mintinline%s{%s}{%s}"
-		 (if (string= options "") "" (format "[%s]" options))
-		 mint-lang
-		 code)))
-      ;; Use listings package.
-      (otherwise
-       ;; Maybe translate language's name.
-       (let* ((org-lang (org-element-property :language inline-src-block))
-	      (lst-lang (or (cadr (assq (intern org-lang)
-					(plist-get info :latex-listings-langs)))
-			    org-lang))
-	      (options (org-latex--make-option-string
-			(append (plist-get info :latex-listings-options)
-				`(("language" ,lst-lang))))))
-	 (concat (format "\\lstinline[%s]" options)
-		 separator code separator))))))
-
+  (let ((code (org-element-property :value inline-src-block))
+        (lang (org-element-property :language inline-src-block)))
+    (pcase (plist-get info :latex-listings)
+      ('nil (org-latex--text-markup code 'code info))
+      ('minted (org-latex-inline-src-block--minted info code lang))
+      (_ (org-latex-inline-src-block--listings info code lang)))))
+
+(defun org-latex-inline-src-block--minted (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using minted.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let ((mint-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-minted-langs)))
+                       (downcase lang)))
+        (options (org-latex--make-option-string
+                  (plist-get info :latex-minted-options))))
+    (format "\\mintinline%s{%s}{%s}"
+            (if (string= options "") "" (format "[%s]" options))
+            mint-lang
+            code)))
+
+(defun org-latex-inline-src-block--listings (info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (let* ((lst-lang (or (cadr (assq (intern lang)
+                                   (plist-get info :latex-listings-langs)))
+                       lang))
+         (separator (org-latex--find-verb-separator code))
+         (options (org-latex--make-option-string
+                   (append (plist-get info :latex-listings-options)
+                           `(("language" ,lst-lang))))))
+    (concat (format "\\lstinline[%s]" options)
+            separator code separator)))
 
 ;;;; Inlinetask
 
-- 
2.35.3


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From 108f321a80de89c72974fc25fcde36c85023daca Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 4 May 2022 23:31:59 +0800
Subject: [PATCH 03/13] ox-latex: More versitile option construction

* lisp/ox-latex.el (org-latex--make-option-string): Support a custom
option seperator string.

(org-latex--make-option-string, org-latex-minted-options,
org-latex-listings-options): The first line of the docstrings for
`org-latex-minted-options` and `org-latex-listings-options` describe the
variables as "association lists", yet `org-latex--make-option-string`
does not handle association lists and an example of two-value lists is
provided.  To make the behaviour match the docstring,
`org-latex--make-option-string` is modified to work with either a list
two-value lists or an association list, and the examples in
`org-latex-minted-options` and `org-latex-listings-options` updated
accordingly.
---
 lisp/ox-latex.el | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 38f36a1f3..2d4b3bace 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1006,12 +1006,16 @@ (defcustom org-latex-listings-options nil
 
 These options are supplied as a comma-separated list to the
 \\lstset command.  Each element of the association list should be
-a list containing two strings: the name of the option, and the
-value.  For example,
+a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-listings-options
     \\='((\"basicstyle\" \"\\\\small\")
       (\"keywordstyle\" \"\\\\color{black}\\\\bfseries\\\\underbar\")))
+  ; or
+  (setq org-latex-listings-options
+    \\='((\"basicstyle\" . \"\\\\small\")
+      (\"keywordstyle\" . \"\\\\color{black}\\\\bfseries\\\\underbar\")))
 
 will typeset the code in a small size font with underlined, bold
 black keywords.
@@ -1059,11 +1063,14 @@ (defcustom org-latex-minted-options nil
 
 These options are supplied within square brackets in
 \\begin{minted} environments.  Each element of the alist should
-be a list containing two strings: the name of the option, and the
-value.  For example,
+be a list or cons cell containing two strings: the name of the
+option, and the value.  For example,
 
   (setq org-latex-minted-options
     \\='((\"bgcolor\" \"bg\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-minted-options
+    \\='((\"bgcolor\" . \"bg\") (\"frame\" . \"lines\")))
 
 will result in source blocks being exported with
 
@@ -1506,21 +1513,24 @@ (defun org-latex--find-verb-separator (s)
 	     when (not (string-match (regexp-quote (char-to-string c)) s))
 	     return (char-to-string c))))
 
-(defun org-latex--make-option-string (options)
+(defun org-latex--make-option-string (options &optional seperator)
   "Return a comma separated string of keywords and values.
 OPTIONS is an alist where the key is the options keyword as
 a string, and the value a list containing the keyword value, or
 nil."
   (mapconcat (lambda (pair)
-	       (pcase-let ((`(,keyword ,value) pair))
-		 (concat keyword
-			 (and (> (length value) 0)
-			      (concat "="
-                                      (if (string-match-p (rx (any "[]")) value)
-                                          (format "{%s}" value)
-                                        value))))))
-	     options
-	     ","))
+               (let ((keyword (car pair))
+                     (value (pcase (cdr pair)
+                              ((pred stringp) (cdr pair))
+                              ((pred consp) (cadr pair)))))
+                 (concat keyword
+                         (when value
+                           (concat "="
+                                   (if (string-match-p (rx (any "[]")) value)
+                                       (format "{%s}" value)
+                                     value))))))
+             options
+             (or seperator ",")))
 
 (defun org-latex--wrap-label (element output info)
   "Wrap label associated to ELEMENT around OUTPUT, if appropriate.
-- 
2.35.3


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From ac29f0f3991faf457f161698b4ad311edfe5d55d Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 21 Nov 2021 20:04:12 +0800
Subject: [PATCH 04/13] ox-latex: Introduce "engraved" code highlighting

* lisp/ox-latex.el (org-latex-src-block, org-latex-src-block--engraved,
org-latex-inline-src-block, org-latex-inline-src-block--engraved,
org-latex-src--engrave-code, org-latex-template, org-latex-listings):
Make use of the engraved-faces package (available on ELPA) to provide an
alternative LaTeX code highlighting backend which functions similarly to
htmlize.el for HTML exports.

(org-latex-engraved-preamble, org-latex-engraved-options): Introduce
variables to construct the preamble for engraved code blocks.

* lisp/ox-beamer.el (org-beamer-template): Modify to add engrave-faces
preamble when applicable.
---
 lisp/ox-beamer.el |   6 +
 lisp/ox-latex.el  | 292 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 289 insertions(+), 9 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 6be73c91e..fe73bf686 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -857,6 +857,12 @@ (defun org-beamer-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
+     ;; engrave-faces-latex preamble
+     (when (and (eq org-latex-listings 'engraved)
+                (org-element-map (plist-get info :parse-tree)
+                    '(src-block inline-src-block) #'identity
+                    info t))
+       (org-latex-generate-engraved-preamble info t))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2d4b3bace..e0f47cf80 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -37,6 +37,8 @@ (defvar org-latex-default-packages-alist)
 (defvar org-latex-packages-alist)
 (defvar orgtbl-exp-regexp)
 
+(declare-function engrave-faces-latex-gen-preamble "ext:engrave-faces-latex")
+(declare-function engrave-faces-latex-buffer "ext:engrave-faces-latex")
 
 \f
 ;;; Define Back-End
@@ -125,6 +127,8 @@ (org-export-define-backend 'latex
     (:latex-default-quote-environment nil nil org-latex-default-quote-environment)
     (:latex-default-table-mode nil nil org-latex-default-table-mode)
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
+    (:latex-engraved-options nil nil org-latex-engraved-options)
+    (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -937,22 +941,48 @@ (defcustom org-latex-listings nil
   "Non-nil means export source code using the listings package.
 
 This package will fontify source code, possibly even with color.
-If you want to use this, you also need to make LaTeX use the
-listings package, and if you want to have color, the color
-package.  Just add these to `org-latex-packages-alist', for
-example using customize, or with something like:
+There are four implementations of this functionality you may
+choose from (ordered from least to most capable):
+1. Verbatim (nil)
+2. Listings (t)
+3. Minted (minted)
+4. Engraved (engraved)
+
+The first two options provide basic syntax
+highlighting (listings), or none at all (verbatim).
+
+When using listings, you also need to make use of the LaTeX
+\"listings\" package. The \"color\" package is also needed if you
+would like color too.  These can simply be added to
+`org-latex-packages-alist', using customise or something like:
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"listings\"))
   (add-to-list \\='org-latex-packages-alist \\='(\"\" \"color\"))
 
-Alternatively,
+There are two further options for more comprehensive
+fontification. The first can be set with,
+
+  (setq org-latex-listings \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the engrave-faces
+package (availible from ELPA), and the fvextra LaTeX package be
+installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the tcolorbox LaTeX package in
+addition to fvextra.
+
+The second more comprehensive option can be set with,
 
   (setq org-latex-listings \\='minted)
 
-causes source code to be exported using the minted package as
-opposed to listings.  If you want to use minted, you need to add
-the minted package to `org-latex-packages-alist', for example
+which causes source code to be exported using the minted package
+as opposed to listings.  If you want to use minted, you need to
+add the minted package to `org-latex-packages-alist', for example
 using customize, or with
 
   (require \\='ox-latex)
@@ -971,8 +1001,9 @@ (defcustom org-latex-listings nil
   :type '(choice
 	  (const :tag "Use listings" t)
 	  (const :tag "Use minted" minted)
+	  (const :tag "Use engrave-faces-latex" engraved)
 	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted))))
+  :safe (lambda (s) (memq s '(t nil minted engraved))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1142,6 +1173,151 @@ (defcustom org-latex-custom-lang-environments nil
   :version "26.1"
   :package-version '(Org . "9.0"))
 
+(defcustom org-latex-engraved-preamble
+  "\\usepackage{fvextra}
+
+[FVEXTRA-SETUP]
+
+% Make line numbers smaller and grey.
+\\renewcommand\\theFancyVerbLine{\\footnotesize\\color{black!40!white}\\arabic{FancyVerbLine}}
+
+\\usepackage{xcolor}
+
+% In case engrave-faces-latex-gen-preamble has not been run.
+\\providecolor{EfD}{HTML}{f7f7f7}
+\\providecolor{EFD}{HTML}{28292e}
+
+% Define a Code environment to prettily wrap the fontified code.
+\\usepackage[breakable,xparse]{tcolorbox}
+\\DeclareTColorBox[]{Code}{o}%
+{colback=EfD!98!EFD, colframe=EfD!95!EFD,
+  fontupper=\\footnotesize\\setlength{\\fboxsep}{0pt},
+  colupper=EFD,
+  IfNoValueTF={#1}%
+  {boxsep=2pt, arc=2.5pt, outer arc=2.5pt,
+    boxrule=0.5pt, left=2pt}%
+  {boxsep=2.5pt, arc=0pt, outer arc=0pt,
+    boxrule=0pt, leftrule=1.5pt, left=0.5pt},
+  right=2pt, top=1pt, bottom=0.5pt,
+  breakable}
+
+[LISTINGS-SETUP]"
+  "Preamble content injected when using engrave-faces-latex for source blocks.
+This is relevant when `org-latex-listings' is set to `engraved'.
+
+There is quite a lot of flexibility in what this preamble can be,
+as long as it:
+- Loads the fvextra package.
+- Loads the package xcolor (if it is not already loaded elsewhere).
+- Defines a \"Code\" environment (note the capital C), which all
+  \"Verbatim\" environments (provided by fvextra) will be wrapped with.
+
+In the default value the colors \"EFD\" and \"EfD\" are provided
+as they are respectively the foreground and background colours,
+just in case they aren't provided by the generated preamble, so
+we can asume they are always set.
+
+Within this preamble there are two recognised macro-like placeholders:
+
+  [FVEXTRA-SETUP]
+
+  [LISTINGS-SETUP]
+
+Unless you have a very good reason, both of these placeholders
+should be included in the preamble.
+
+FVEXTRA-SETUP sets fvextra's defaults according to
+`org-latex-engraved-options', and LISTINGS-SETUP creates the
+listings environment used for captioned or floating code blocks,
+as well as defining \\listoflistings."
+  :group 'org-export-latex
+  :type 'string
+  :package-version '(Org . "9.6"))
+
+(defcustom org-latex-engraved-options
+  '(("commandchars" . "\\\\\\{\\}")
+    ("highlightcolor" . "white!95!black!80!blue")
+    ("breaklines" . "true")
+    ("breaksymbol" . "\\color{white!60!black}\\tiny\\ensuremath{\\hookrightarrow}"))
+  "Association list of options for the latex fvextra package when engraving code.
+
+These options are set using \\fvset{...} in the preamble of the
+LaTeX export.  Each element of the alist should be a list or cons
+cell containing two strings: the name of the option, and the
+value.  For example,
+
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" \"green\") (\"frame\" \"lines\")))
+  ; or
+  (setq org-latex-engraved-options
+    \\='((\"highlightcolor\" . \"green\") (\"frame\" . \"lines\")))
+
+will result in the following LaTeX in the preamble
+
+\\fvset{%
+  bgcolor=bg,
+  frame=lines}
+
+This will affect all fvextra environments.  Note that the same
+options will be applied to all blocks.  If you need
+block-specific options, you may use the following syntax:
+
+  #+ATTR_LATEX: :options key1=value1,key2=value2
+  #+BEGIN_SRC <LANG>
+  ...
+  #+END_SRC"
+  :group 'org-export-latex
+  :type '(alist :key-type (string :tag "option")
+                :value-type (string :tag "value")))
+
+(defun org-latex-generate-engraved-preamble (info syntax-colours-p)
+  "Generate the preamble to setup engraved code.
+The result is constructed from the :latex-engraved-preamble and
+:latex-engraved-optionsn export options, the default values of
+which are given by `org-latex-engraved-preamble' and
+`org-latex-engraved-options' respectively."
+  (let* ((engraved-options
+          (plist-get info :latex-engraved-options))
+         (engraved-preamble (plist-get info :latex-engraved-preamble)))
+    (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
+      (setq engraved-preamble
+            (replace-match
+             (concat
+              "\\fvset{%\n  "
+              (org-latex--make-option-string engraved-options ",\n  ")
+              "}\n")
+             t t
+             engraved-preamble)))
+    (when (string-match "^[ \t]*\\[LISTINGS-SETUP\\][ \t]*\n?" engraved-preamble)
+      (setq engraved-preamble
+            (replace-match
+             (format
+              "%% Support listings with captions
+\\usepackage{float}
+\\floatstyle{%s}
+\\newfloat{listing}{htbp}{lst}
+\\newcommand{\\listingsname}{Listing}
+\\floatname{listing}{\\listingsname}
+\\newcommand{\\listoflistingsname}{List of Listings}
+\\providecommand{\\listoflistings}{\\listof{listing}{\\listoflistingsname}}\n"
+              (if (memq 'src-block org-latex-caption-above)
+                  "plaintop" "plain"))
+             t t
+             engraved-preamble)))
+    (if syntax-colours-p
+        (concat
+         "\n% Setup for code blocks [1/2]\n\n"
+         engraved-preamble
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         (if (require 'engrave-faces-latex nil t)
+             (engrave-faces-latex-gen-preamble)
+           (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
+           "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
+         "\n")
+      (concat
+       "\n% Setup for code blocks\n\n"
+       engraved-preamble
+       "\n"))))
 
 ;;;; Compilation
 
@@ -1756,6 +1932,12 @@ (defun org-latex-template (contents info)
      (let ((template (plist-get info :latex-hyperref-template)))
        (and (stringp template)
             (format-spec template spec)))
+     ;; engrave-faces-latex preamble
+     (when (and (eq org-latex-listings 'engraved)
+                (org-element-map (plist-get info :parse-tree)
+                    '(src-block inline-src-block) #'identity
+                    info t))
+       (org-latex-generate-engraved-preamble info t))
      ;; Document start.
      "\\begin{document}\n\n"
      ;; Title command.
@@ -2142,6 +2324,7 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
     (pcase (plist-get info :latex-listings)
       ('nil (org-latex--text-markup code 'code info))
       ('minted (org-latex-inline-src-block--minted info code lang))
+      ('engraved (org-latex-inline-src-block--engraved info code lang))
       (_ (org-latex-inline-src-block--listings info code lang)))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
@@ -2157,6 +2340,11 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
+(defun org-latex-inline-src-block--engraved (_info code lang)
+  "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
+INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
+  (format "\\Verb{%s}" (org-latex-src--engrave-code code lang)))
+
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
@@ -2323,6 +2511,7 @@ (defun org-latex-keyword (keyword _contents info)
 	  (cl-case (plist-get info :latex-listings)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
+	    (engraved "\\listoflistings")
 	    (otherwise "\\lstlistoflistings")))))))))
 
 
@@ -3017,6 +3206,9 @@ (defun org-latex-src-block (src-block _contents info)
                                      num-start retain-labels attributes float custom-env))
        ((eq listings 'minted)
         (org-latex-src-block--minted src-block info lang caption caption-above-p label
+                                     num-start retain-labels attributes float))
+       ((eq listings 'engraved)
+        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
                                        num-start retain-labels attributes float))
        (t
         (org-latex-src-block--listings src-block info lang caption caption-above-p label
@@ -3133,6 +3325,88 @@ (defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
+(defun org-latex-src--engrave-code (content lang)
+  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
+  (if (require 'engrave-faces-latex nil t)
+      (let* ((lang-mode (and lang (org-src-get-lang-mode lang)))
+             (engraved-buffer
+              (with-temp-buffer
+                (insert content)
+                (when lang-mode
+                  (if (functionp lang-mode)
+                      (funcall lang-mode)
+                    (message "Cannot engrave code as %s. %s is undefined."
+                             lang lang-mode)))
+                (engrave-faces-latex-buffer)))
+             (engraved-code
+              (with-current-buffer engraved-buffer
+                (buffer-string))))
+        (kill-buffer engraved-buffer)
+        engraved-code)
+    (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
+
+(defun org-latex-src-block--engraved
+    (src-block info lang caption caption-above-p _label
+               num-start retain-labels attributes float)
+  "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
+LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
+and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
+  (let* ((caption-str (org-latex--caption/label-string src-block info))
+         (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
+                        (plist-get info :latex-default-figure-position)))
+         (float-env
+          (cond
+           ((string= "multicolumn" float)
+            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           (caption
+            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
+                    placement
+                    (if caption-above-p caption-str "")
+                    (if caption-above-p "" caption-str)))
+           ((string= "t" float)
+            (concat (format "\\begin{listing}[%s]\n"
+                            placement)
+                    "%s\n\\end{listing}"))
+           (t "%s")))
+         (options (plist-get info :latex-engraved-options))
+         (content
+          (let* ((code-info (org-export-unravel-code src-block))
+                 (max-width
+                  (apply 'max
+                         (mapcar 'string-width
+                                 (org-split-string (car code-info)
+                                                   "\n")))))
+            (org-export-format-code
+             (car code-info)
+             (lambda (loc _num ref)
+               (concat
+                loc
+                (when ref
+                  ;; Ensure references are flushed to the right,
+                  ;; separated with 6 spaces from the widest line
+                  ;; of code.
+                  (concat (make-string (+ (- max-width (length loc)) 6)
+                                       ?\s)
+                          (format "(%s)" ref)))))
+             nil (and retain-labels (cdr code-info)))))
+         (body
+          (format
+           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
+           ;; Options.
+           (concat
+            (org-latex--make-option-string
+             (append
+              (when (and num-start (not (assoc "linenos" options)))
+                `(("linenos")
+                  ("firstnumber" ,(number-to-string (1+ num-start)))))
+              (let ((local-options (plist-get attributes :options)))
+                (and local-options (list local-options))))))
+           (org-latex-src--engrave-code content lang))))
+    (format float-env body)))
+
 (defun org-latex-src-block--listings
     (src-block info lang caption caption-above-p label
                num-start retain-labels attributes float)
-- 
2.35.3


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From 815de46384a566b3dcd86061b9aa93563a7acb29 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 13:59:13 +0800
Subject: [PATCH 05/13] ox-latex: Don't use `length' to get string width

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted): Use
`string-width' instead of `length' to gauge the displayed width of the
string in LaTeX.  This may not be a perfect match, but it should be an
improvement.
---
 lisp/ox-latex.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index e0f47cf80..0788b40c0 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3306,7 +3306,7 @@ (defun org-latex-src-block--minted
            (let* ((code-info (org-export-unravel-code src-block))
                   (max-width
                    (apply 'max
-                          (mapcar 'length
+                          (mapcar 'string-width
                                   (org-split-string (car code-info)
                                                     "\n")))))
              (org-export-format-code
@@ -3458,7 +3458,7 @@ (defun org-latex-src-block--listings
       (let* ((code-info (org-export-unravel-code src-block))
              (max-width
               (apply 'max
-                     (mapcar 'length
+                     (mapcar 'string-width
                              (org-split-string (car code-info) "\n")))))
         (org-export-format-code
          (car code-info)
-- 
2.35.3


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From fadf2011884d0e46b5442ec43dc942050e2fd048 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:02:44 +0800
Subject: [PATCH 06/13] ox-latex: Refactor source block transcode fun sigs

* lisp/ox-latex.el (org-latex-src-block--listings,
org-latex-src-block--engraved, org-latex-src-block--minted,
org-latex-src-block--custom): Refactor these --backend functions to use
cl-defun with keys instead of having an 11-argument signature.
(org-latex-src-block): Adjust for the change in signature of the
--backend functions, and refactor the `cond' statement to use `pcase'.
---
 lisp/ox-latex.el | 82 +++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 43 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 0788b40c0..4a077bb27 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3186,37 +3186,37 @@ (defun org-latex-src-block (src-block _contents info)
 contextual information."
   (when (org-string-nw-p (org-element-property :value src-block))
     (let* ((lang (org-element-property :language src-block))
-	   (caption (org-element-property :caption src-block))
-	   (caption-above-p (org-latex--caption-above-p src-block info))
-	   (label (org-element-property :name src-block))
-	   (custom-env (and lang
-			    (cadr (assq (intern lang)
-					org-latex-custom-lang-environments))))
-	   (num-start (org-export-get-loc src-block info))
-	   (retain-labels (org-element-property :retain-labels src-block))
-	   (attributes (org-export-read-attribute :attr_latex src-block))
-	   (float (plist-get attributes :float))
-	   (listings (plist-get info :latex-listings)))
-      (cond
-       ((or (not lang) (not listings))
-        (org-latex-src-block--verbatim src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (custom-env
-        (org-latex-src-block--custom src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float custom-env))
-       ((eq listings 'minted)
-        (org-latex-src-block--minted src-block info lang caption caption-above-p label
-                                     num-start retain-labels attributes float))
-       ((eq listings 'engraved)
-        (org-latex-src-block--engraved src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))
-       (t
-        (org-latex-src-block--listings src-block info lang caption caption-above-p label
-                                       num-start retain-labels attributes float))))))
-
-(defun org-latex-src-block--verbatim
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels _attributes float)
+           (caption (org-element-property :caption src-block))
+           (caption-above-p (org-latex--caption-above-p src-block info))
+           (label (org-element-property :name src-block))
+           (custom-env (and lang
+                            (cadr (assq (intern lang)
+                                        org-latex-custom-lang-environments))))
+           (num-start (org-export-get-loc src-block info))
+           (retain-labels (org-element-property :retain-labels src-block))
+           (attributes (org-export-read-attribute :attr_latex src-block))
+           (float (plist-get attributes :float))
+           (listings (plist-get info :latex-listings)))
+      (funcall
+       (pcase listings
+         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
+         ((guard custom-env) #'org-latex-src-block--custom)
+         ('minted #'org-latex-src-block--minted)
+         ('engraved #'org-latex-src-block--engraved)
+         (_ #'org-latex-src-block--listings))
+       :src-block src-block
+       :info info
+       :lang lang
+       :caption caption
+       :caption-above-p caption-above-p
+       :label label
+       :num-start num-start
+       :retain-labels retain-labels
+       :attributes attributes
+       :float float))))
+
+(cl-defun org-latex-src-block--verbatim
+    (&key src-block info caption caption-above-p float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using verbatim.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3235,9 +3235,8 @@ (defun org-latex-src-block--verbatim
                     (if caption-above-p "" (concat "\n" caption-str))))
           (t verbatim))))
 
-(defun org-latex-src-block--custom
-    (src-block info _lang caption caption-above-p _label
-               _num-start _retain-labels attributes float custom-env)
+(cl-defun org-latex-src-block--custom
+    (&key src-block info caption caption-above-p attributes float custom-env &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using a custom environment.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3257,9 +3256,8 @@ (defun org-latex-src-block--custom
                      (?l . ,(org-latex--label src-block info))
                      (?o . ,(or (plist-get attributes :options) "")))))))
 
-(defun org-latex-src-block--minted
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--minted
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using minted.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3345,9 +3343,8 @@ (defun org-latex-src--engrave-code (content lang)
         engraved-code)
     (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
 
-(defun org-latex-src-block--engraved
-    (src-block info lang caption caption-above-p _label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--engraved
+    (&key src-block info lang caption caption-above-p num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using engrave-faces-latex.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
@@ -3407,9 +3404,8 @@ (defun org-latex-src-block--engraved
            (org-latex-src--engrave-code content lang))))
     (format float-env body)))
 
-(defun org-latex-src-block--listings
-    (src-block info lang caption caption-above-p label
-               num-start retain-labels attributes float)
+(cl-defun org-latex-src-block--listings
+    (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
   "Transcode a SRC-BLOCK element from Org to LaTeX, using listings.
 LANG, CAPTION, CAPTION-ABOVE-P, LABEL, NUM-START, RETAIN-LABELS, ATTRIBUTES
 and FLOAT are extracted from SRC-BLOCK and INFO in `org-latex-src-block'."
-- 
2.35.3


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From e6dfd941daf06beb859ae6effd0be9d734121897 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sat, 7 May 2022 14:46:28 +0800
Subject: [PATCH 07/13] ox-latex: Replace `org-latex-listings'

* lisp/ox-latex.el (org-latex-src-block, org-latex-keyword,
org-latex-inline-src-block, org-latex-template,
org-latex--caption/label-string, org-latex-engraved-preamble,
org-latex-listings): Replace `org-latex-listings' with
`org-latex-src-block-backend', which now can be set to listings/verbatim
and no longer advertises t/nil as valid values.

* lisp/ox-beamer.el (org-beamer-template): Update in the same manner as
`org-latex-template'.

* lisp/org-compat.el: Make `org-latex-listings' an obsolete alias for
`org-latex-src-block-backend'.

* testing/lisp/test-ox.el: Replace `org-latex-listings' reference with
`org-latex-src-block-backend'.

* doc/org-manual.org (Footnotes, LaTeX specific properties, Literal
Examples): Replace references to `org-latex-listings' with
`org-latex-src-block-backend'.

* etc/ORG-NEWS: Add a news entry noting this change.

The variable `org-latex-listings' originally indicated whether source
blocks should use the listings LaTeX package, or not.  This usage has
evolved over the years, and now it sets one of four different
fontification backends.  This renaming should make the variable name a
bit less misleading.
---
 doc/org-manual.org      |   6 +--
 etc/ORG-NEWS            |   9 ++++
 lisp/org-compat.el      |   2 +
 lisp/ox-beamer.el       |   2 +-
 lisp/ox-latex.el        | 117 ++++++++++++++++++++++------------------
 testing/lisp/test-ox.el |   2 +-
 6 files changed, 81 insertions(+), 57 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index c0d38cd8c..60bded419 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -11159,7 +11159,7 @@ ** Literal Examples
 #+end_example
 
 #+cindex: formatting source code, markup rules
-#+vindex: org-latex-listings
+#+vindex: org-latex-src-block-backend
 If the example is source code from a programming language, or any
 other text that can be marked up by Font Lock in Emacs, you can ask
 for the example to look like the fontified Emacs buffer[fn:114].  This
@@ -16304,12 +16304,12 @@ **** LaTeX specific properties
 | ~:latex-link-with-unknown-path-format~ | ~org-latex-link-with-unknown-path-format~ |
 | ~:latex-listings-langs~                | ~org-latex-listings-langs~                |
 | ~:latex-listings-options~              | ~org-latex-listings-options~              |
-| ~:latex-listings~                      | ~org-latex-listings~                      |
 | ~:latex-minted-langs~                  | ~org-latex-minted-langs~                  |
 | ~:latex-minted-options~                | ~org-latex-minted-options~                |
 | ~:latex-prefer-user-labels~            | ~org-latex-prefer-user-labels~            |
 | ~:latex-subtitle-format~               | ~org-latex-subtitle-format~               |
 | ~:latex-subtitle-separate~             | ~org-latex-subtitle-separate~             |
+| ~:latex-src-block-backend~             | ~org-latex-src-block-backend~             |
 | ~:latex-table-scientific-notation~     | ~org-latex-table-scientific-notation~     |
 | ~:latex-tables-booktabs~               | ~org-latex-tables-booktabs~               |
 | ~:latex-tables-centered~               | ~org-latex-tables-centered~               |
@@ -22256,7 +22256,7 @@ * Footnotes
 version 1.34 of the =htmlize.el= package, which you need to install).
 Fontified code chunks in LaTeX can be achieved using either the
 [[https://www.ctan.org/pkg/listings][listings]] package or the [[https://www.ctan.org/pkg/minted][minted]] package.  Refer to
-~org-latex-listings~ for details.
+~org-latex-src-block-backend~ for details.
 
 [fn:115] Source code in code blocks may also be evaluated either
 interactively or on export.  See [[*Working with Source Code]] for more
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 27de6da62..ebb3cd649 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -273,6 +273,15 @@ Chmod-style permissions are based on the new variable
 ~org-babel-tangle-default-file-mode~.
 
 *** A new custom setting =org-agenda-clock-report-header= to add a header to org agenda clock report
+
+*** ~org-latex-listings~ has been replaced with ~org-latex-src-block-backend~
+
+~org-latex-listings~ has been renamed to better reflect the current
+purpose of the variable.  The replacement variable
+~org-latex-src-block-backend~ acts in exactly the same way, however it
+accepts =listings= and =verbatim= in place of =t= and =nil= (which
+still work, but are no longer listed as valid options).
+
 * Version 9.5
 
 ** Important announcements and breaking changes
diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index a29f206a4..704197645 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -324,6 +324,8 @@ (define-obsolete-variable-alias 'org-latex-create-formula-image-program
   'org-preview-latex-default-process "9.0")
 (define-obsolete-variable-alias 'org-latex-preview-ltxpng-directory
   'org-preview-latex-image-directory "9.0")
+(define-obsolete-variable-alias 'org-latex-listings
+  'org-latex-src-block-backend "9.6")
 (define-obsolete-function-alias 'org-table-p 'org-at-table-p "9.0")
 (define-obsolete-function-alias 'org-on-heading-p 'org-at-heading-p "9.0")
 (define-obsolete-function-alias 'org-at-regexp-p 'org-in-regexp "8.3")
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index fe73bf686..e6232d8d2 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -858,7 +858,7 @@ (defun org-beamer-template (contents info)
        (and (stringp template)
 	    (format-spec template (org-latex--format-spec info))))
      ;; engrave-faces-latex preamble
-     (when (and (eq org-latex-listings 'engraved)
+     (when (and (eq org-latex-src-block-backend 'engraved)
                 (org-element-map (plist-get info :parse-tree)
                     '(src-block inline-src-block) #'identity
                     info t))
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 4a077bb27..f81625b45 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -143,7 +143,7 @@ (org-export-define-backend 'latex
     (:latex-inactive-timestamp-format nil nil org-latex-inactive-timestamp-format)
     (:latex-inline-image-rules nil nil org-latex-inline-image-rules)
     (:latex-link-with-unknown-path-format nil nil org-latex-link-with-unknown-path-format)
-    (:latex-listings nil nil org-latex-listings)
+    (:latex-src-block-backend nil nil org-latex-src-block-backend)
     (:latex-listings-langs nil nil org-latex-listings-langs)
     (:latex-listings-options nil nil org-latex-listings-options)
     (:latex-minted-langs nil nil org-latex-minted-langs)
@@ -937,22 +937,22 @@ (defcustom org-latex-format-inlinetask-function
 
 ;; Src blocks
 
-(defcustom org-latex-listings nil
-  "Non-nil means export source code using the listings package.
+(defcustom org-latex-src-block-backend 'verbatim
+  "Backend used to generate source code listings.
 
-This package will fontify source code, possibly even with color.
-There are four implementations of this functionality you may
+This sets the behaviour for fontifying source code, possibly even with
+color.  There are four implementations of this functionality you may
 choose from (ordered from least to most capable):
-1. Verbatim (nil)
-2. Listings (t)
-3. Minted (minted)
-4. Engraved (engraved)
+1. Verbatim
+2. Listings
+3. Minted
+4. Engraved
 
 The first two options provide basic syntax
 highlighting (listings), or none at all (verbatim).
 
-When using listings, you also need to make use of the LaTeX
-\"listings\" package. The \"color\" package is also needed if you
+When using listings, you also need to make use of LaTeX package
+\"listings\"e. The \"color\" LaTeX package is also needed if you
 would like color too.  These can simply be added to
 `org-latex-packages-alist', using customise or something like:
 
@@ -963,27 +963,12 @@ (defcustom org-latex-listings nil
 There are two further options for more comprehensive
 fontification. The first can be set with,
 
-  (setq org-latex-listings \\='engraved)
+  (setq org-latex-src-block-backend \\='minted)
 
-which causes source code to be run through
-`engrave-faces-latex-buffer', which generates colorings using
-Emacs' font-lock information.  This requires the engrave-faces
-package (availible from ELPA), and the fvextra LaTeX package be
-installed.
-
-The styling of the engraved result can customised with
-`org-latex-engraved-preamble' and `org-latex-engraved-options'.
-The default preamble also uses the tcolorbox LaTeX package in
-addition to fvextra.
-
-The second more comprehensive option can be set with,
-
-  (setq org-latex-listings \\='minted)
-
-which causes source code to be exported using the minted package
-as opposed to listings.  If you want to use minted, you need to
-add the minted package to `org-latex-packages-alist', for example
-using customize, or with
+which causes source code to be exported using the LaTeX package
+minted as opposed to listings.  If you want to use minted, you
+need to add the minted package to `org-latex-packages-alist', for
+example using customize, or with
 
   (require \\='ox-latex)
   (add-to-list \\='org-latex-packages-alist \\='(\"newfloat\" \"minted\"))
@@ -996,14 +981,29 @@ (defcustom org-latex-listings nil
 The minted choice has possible repercussions on the preview of
 latex fragments (see `org-preview-latex-fragment').  If you run
 into previewing problems, please consult
-URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'."
+URL `https://orgmode.org/worg/org-tutorials/org-latex-preview.html'.
+
+The most comprehensive option can be set with,
+
+  (setq org-latex-src-block-backend \\='engraved)
+
+which causes source code to be run through
+`engrave-faces-latex-buffer', which generates colorings using
+Emacs' font-lock information.  This requires the Emacs package
+engrave-faces (availible from ELPA), and the LaTeX package
+fvextra be installed.
+
+The styling of the engraved result can customised with
+`org-latex-engraved-preamble' and `org-latex-engraved-options'.
+The default preamble also uses the LaTeX package tcolorbox in
+addition to fvextra."
   :group 'org-export-latex
   :type '(choice
-	  (const :tag "Use listings" t)
+	  (const :tag "Use listings" listings)
 	  (const :tag "Use minted" minted)
 	  (const :tag "Use engrave-faces-latex" engraved)
-	  (const :tag "Export verbatim" nil))
-  :safe (lambda (s) (memq s '(t nil minted engraved))))
+	  (const :tag "Export verbatim" verbatim))
+  :safe (lambda (s) (memq s '(listings minted engraved verbatim))))
 
 (defcustom org-latex-listings-langs
   '((emacs-lisp "Lisp") (lisp "Lisp") (clojure "Lisp")
@@ -1203,7 +1203,7 @@ (defcustom org-latex-engraved-preamble
 
 [LISTINGS-SETUP]"
   "Preamble content injected when using engrave-faces-latex for source blocks.
-This is relevant when `org-latex-listings' is set to `engraved'.
+This is relevant when `org-latex-src-block-backend' is set to `engraved'.
 
 There is quite a lot of flexibility in what this preamble can be,
 as long as it:
@@ -1526,7 +1526,8 @@ (defun org-latex--caption/label-string (element info)
 			    main)
 		       (and (eq type 'src-block)
 			    (not (plist-get attr :float))
-			    (null (plist-get info :latex-listings)))))
+			    (memq (plist-get info :latex-src-block-backend)
+                                  '(verbatim nil)))))
 	 (short (org-export-get-caption element t))
 	 (caption-from-attr-latex (plist-get attr :caption)))
     (cond
@@ -1546,7 +1547,8 @@ (defun org-latex--caption/label-string (element info)
 		      (paragraph "figure")
 		      (image "figure")
 		      (special-block "figure")
-		      (src-block (if (plist-get info :latex-listings)
+		      (src-block (if (not (memq (plist-get info :latex-src-block-backend)
+                                                '(verbatim nil)))
 				     "listing"
 				   "figure"))
 		      (t (symbol-name type*)))
@@ -1933,7 +1935,7 @@ (defun org-latex-template (contents info)
        (and (stringp template)
             (format-spec template spec)))
      ;; engrave-faces-latex preamble
-     (when (and (eq org-latex-listings 'engraved)
+     (when (and (eq org-latex-src-block-backend 'engraved)
                 (org-element-map (plist-get info :parse-tree)
                     '(src-block inline-src-block) #'identity
                     info t))
@@ -2321,11 +2323,17 @@ (defun org-latex-inline-src-block (inline-src-block _contents info)
 contextual information."
   (let ((code (org-element-property :value inline-src-block))
         (lang (org-element-property :language inline-src-block)))
-    (pcase (plist-get info :latex-listings)
-      ('nil (org-latex--text-markup code 'code info))
-      ('minted (org-latex-inline-src-block--minted info code lang))
-      ('engraved (org-latex-inline-src-block--engraved info code lang))
-      (_ (org-latex-inline-src-block--listings info code lang)))))
+    (pcase (plist-get info :latex-src-block-backend)
+      (`verbatim (org-latex--text-markup code 'code info))
+      (`minted (org-latex-inline-src-block--minted info code lang))
+      (`engraved (org-latex-inline-src-block--engraved info code lang))
+      (`listings (org-latex-inline-src-block--listings info code lang))
+      (oldval
+       (message "Please update the LaTeX src-block-backend to %s"
+                (if oldval "listings" "verbatim"))
+       (if oldval
+           (org-latex-inline-src-block--listings info code lang)
+         (org-latex--text-markup code 'code info))))))
 
 (defun org-latex-inline-src-block--minted (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using minted.
@@ -2508,7 +2516,7 @@ (defun org-latex-keyword (keyword _contents info)
 	      (concat depth (and depth "\n") "\\tableofcontents"))))
 	 ((string-match-p "\\<tables\\>" value) "\\listoftables")
 	 ((string-match-p "\\<listings\\>" value)
-	  (cl-case (plist-get info :latex-listings)
+	  (cl-case (plist-get info :latex-src-block-backend)
 	    ((nil) "\\listoffigures")
 	    (minted "\\listoflistings")
 	    (engraved "\\listoflistings")
@@ -3195,15 +3203,20 @@ (defun org-latex-src-block (src-block _contents info)
            (num-start (org-export-get-loc src-block info))
            (retain-labels (org-element-property :retain-labels src-block))
            (attributes (org-export-read-attribute :attr_latex src-block))
-           (float (plist-get attributes :float))
-           (listings (plist-get info :latex-listings)))
+           (float (plist-get attributes :float)))
       (funcall
-       (pcase listings
-         ((or (pred not) (guard (not lang))) #'org-latex-src-block--verbatim)
+       (pcase (plist-get info :latex-src-block-backend)
+         ((or `verbatim (guard (not lang))) #'org-latex-src-block--verbatim)
+         (`minted #'org-latex-src-block--minted)
+         (`engraved #'org-latex-src-block--engraved)
+         (`listings #'org-latex-src-block--listings)
          ((guard custom-env) #'org-latex-src-block--custom)
-         ('minted #'org-latex-src-block--minted)
-         ('engraved #'org-latex-src-block--engraved)
-         (_ #'org-latex-src-block--listings))
+         (oldval
+          (message "Please update the LaTeX src-block-backend to %s"
+                   (if oldval "listings" "verbatim"))
+          (if oldval
+              #'org-latex-src-block--listings
+            #'org-latex-src-block--verbatim)))
        :src-block src-block
        :info info
        :lang lang
diff --git a/testing/lisp/test-ox.el b/testing/lisp/test-ox.el
index 25e02b258..28f950813 100644
--- a/testing/lisp/test-ox.el
+++ b/testing/lisp/test-ox.el
@@ -3978,7 +3978,7 @@ (ert-deftest test-org-export/latex-src-block-verbatim-caption ()
 \\end{verbatim}
 \\caption{Caption is below, 60\\%s}
 \\end{figure*}"
-	     (let ((org-latex-listings 'minted) ; inactive due to missing lang
+	     (let ((org-latex-src-block-backend 'minted) ; inactive due to missing lang
 		   (org-latex-default-figure-position "tp"))
 	       ;; Namely "multicolumn" value to get just figure environment
 	       ;; looks like a bug.
-- 
2.35.3


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From 7bc1f26f126449d8e457d88d6344aa1b5d439dfe Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 8 May 2022 02:01:34 +0800
Subject: [PATCH 08/13] ox-latex: Support setting the engraved theme

* lisp/ox-latex.el (org-latex-generate-engraved-preamble,
org-latex-engraved-theme): Introduce the new export keyword
LATEX_ENGRAVED_THEME with default value given by
`org-latex-engraved-theme'.  This is used to set the engraved theme used
in org-latex-engraved-theme.

This bumps the minimum required version of engrave-faces from v0.2 to
v0.3.
---
 lisp/ox-latex.el | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index f81625b45..e367e9040 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -129,6 +129,7 @@ (org-export-define-backend 'latex
     (:latex-diary-timestamp-format nil nil org-latex-diary-timestamp-format)
     (:latex-engraved-options nil nil org-latex-engraved-options)
     (:latex-engraved-preamble nil nil org-latex-engraved-preamble)
+    (:latex-engraved-theme "LATEX_ENGRAVED_THEME" nil org-latex-engraved-theme)
     (:latex-footnote-defined-format nil nil org-latex-footnote-defined-format)
     (:latex-footnote-separator nil nil org-latex-footnote-separator)
     (:latex-format-drawer-function nil nil org-latex-format-drawer-function)
@@ -1270,6 +1271,14 @@ (defcustom org-latex-engraved-options
   :type '(alist :key-type (string :tag "option")
                 :value-type (string :tag "value")))
 
+(defcustom org-latex-engraved-theme nil
+  "The theme that should be used for engraved code, when non-nil.
+This can be set to any theme defined in `engrave-faces-themes' or
+loadable by Emacs.  When set to t, the current Emacs theme is
+used.  When nil, no theme is applied."
+  :group 'org-export-latex
+  :type 'symbol)
+
 (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
   "Generate the preamble to setup engraved code.
 The result is constructed from the :latex-engraved-preamble and
@@ -1278,7 +1287,8 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
 `org-latex-engraved-options' respectively."
   (let* ((engraved-options
           (plist-get info :latex-engraved-options))
-         (engraved-preamble (plist-get info :latex-engraved-preamble)))
+         (engraved-preamble (plist-get info :latex-engraved-preamble))
+         (engraved-theme (plist-get info :latex-engraved-theme)))
     (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
       (setq engraved-preamble
             (replace-match
@@ -1310,7 +1320,8 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
          engraved-preamble
          "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
          (if (require 'engrave-faces-latex nil t)
-             (engrave-faces-latex-gen-preamble)
+             (engrave-faces-latex-gen-preamble
+              (when engraved-theme (intern engraved-theme)))
            (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
            "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
          "\n")
-- 
2.35.3


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From 24db3cc69c2e28e4207532ac5181e27a28456eae Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Sun, 8 May 2022 15:28:29 +0800
Subject: [PATCH 09/13] ox-latex: Support setting engraved theme per-block

* lisp/ox-latex.el (org-latex-src-block--engraved,
org-latex-src--engrave-code, org-latex-inline-src-block--engraved,
org-latex-generate-engraved-preamble): Allow for the engraved theme used
to be set on a per-src-block basis with #+attr_latex: :engraved-theme
THEME.  Extra setup code is now generated in
`org-latex-generate-engraved-preamble'.  To facilitate the application
of themes to src blocks, `org-latex-src--engrave-code' now takes on a
larger portion of the transcoding work.
---
 lisp/ox-latex.el | 120 +++++++++++++++++++++++++++++++++++++----------
 1 file changed, 96 insertions(+), 24 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index e367e9040..9634461bd 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1288,7 +1288,27 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
   (let* ((engraved-options
           (plist-get info :latex-engraved-options))
          (engraved-preamble (plist-get info :latex-engraved-preamble))
-         (engraved-theme (plist-get info :latex-engraved-theme)))
+         (engraved-theme (plist-get info :latex-engraved-theme))
+         (engraved-themes
+          (cl-delete-duplicates
+           (org-element-map
+               (plist-get info :parse-tree)
+               '(src-block inline-src-block)
+             (lambda (src)
+               (plist-get
+                (org-export-read-attribute :attr_latex src)
+                :engraved-theme))
+             info)))
+         (gen-theme-spec
+          (lambda (theme)
+            (if (eq engrave-faces-latex-output-style 'preset)
+                (engrave-faces-latex-gen-preamble (when theme (intern theme)))
+              (engrave-faces-latex-gen-preamble-line
+               'default
+               (alist-get 'default
+                          (if theme
+                              (engrave-faces-get-theme (intern theme))
+                            engrave-faces-current-preset-style)))))))
     (when (string-match "^[ \t]*\\[FVEXTRA-SETUP\\][ \t]*\n?" engraved-preamble)
       (setq engraved-preamble
             (replace-match
@@ -1318,10 +1338,31 @@ (defun org-latex-generate-engraved-preamble (info syntax-colours-p)
         (concat
          "\n% Setup for code blocks [1/2]\n\n"
          engraved-preamble
-         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n"
+         "\n\n% Setup for code blocks [2/2]: syntax highlighting colors\n\n"
          (if (require 'engrave-faces-latex nil t)
-             (engrave-faces-latex-gen-preamble
-              (when engraved-theme (intern engraved-theme)))
+             (if engraved-themes
+                 (concat
+                  (mapconcat
+                   (lambda (theme)
+                     (format
+                      "\n\\newcommand{\\engravedtheme%s}{%%\n%s\n}"
+                      (replace-regexp-in-string "[^A-Za-z]" "" theme)
+                      (replace-regexp-in-string
+                       "newcommand" "renewcommand"
+                       (replace-regexp-in-string
+                        "#" "##"
+                        (funcall gen-theme-spec theme)))))
+                   engraved-themes
+                   "\n")
+                  "\n\n"
+                  (cond
+                   ((memq engraved-theme engraved-themes)
+                    (concat "\\engravedtheme"
+                            (replace-regexp-in-string
+                             "[^A-Za-z]" "" engraved-theme)
+                            "\n"))
+                   (t (funcall gen-theme-spec engraved-theme))))
+               (funcall gen-theme-spec engraved-theme))
            (message "Cannot engrave source blocks. Consider installing `engrave-faces'.")
            "% WARNING syntax highlighting unavailible as engrave-faces-latex was missing.\n")
          "\n")
@@ -2359,10 +2400,11 @@ (defun org-latex-inline-src-block--minted (info code lang)
             mint-lang
             code)))
 
-(defun org-latex-inline-src-block--engraved (_info code lang)
+(defun org-latex-inline-src-block--engraved (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using engrave-faces.
 INFO, CODE, and LANG are provided by `org-latex-inline-src-block'."
-  (format "\\Verb{%s}" (org-latex-src--engrave-code code lang)))
+  (org-latex-src--engrave-code
+   code lang nil (plist-get info :latex-engraved-options) t))
 
 (defun org-latex-inline-src-block--listings (info code lang)
   "Transcode an inline src block's content from Org to LaTeX, using lstlistings.
@@ -3347,13 +3389,25 @@ (cl-defun org-latex-src-block--minted
     ;; Return value.
     (format float-env body)))
 
-(defun org-latex-src--engrave-code (content lang)
-  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result."
+(defun org-latex-src--engrave-code (content lang &optional theme options inline)
+  "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
+When the THEME symbol is non-nil, that theme will be used.
+
+When INLINE is nil, a Verbatim environment wrapped in a Code
+environment will be used. When t, a Verb command will be used.
+
+When OPTIONS is provided, as either a string or list of key-value
+pairs accepted by `org-latex--make-option-string', it is passed
+to the Verbatim environment or Verb command."
   (if (require 'engrave-faces-latex nil t)
       (let* ((lang-mode (and lang (org-src-get-lang-mode lang)))
+             (engrave-faces-current-preset-style
+              (if theme
+                  (engrave-faces-get-theme theme)
+                engrave-faces-current-preset-style))
              (engraved-buffer
               (with-temp-buffer
-                (insert content)
+                (insert (string-trim-right content "\n"))
                 (when lang-mode
                   (if (functionp lang-mode)
                       (funcall lang-mode)
@@ -3362,9 +3416,27 @@ (defun org-latex-src--engrave-code (content lang)
                 (engrave-faces-latex-buffer)))
              (engraved-code
               (with-current-buffer engraved-buffer
-                (buffer-string))))
+                (buffer-string)))
+             (engraved-options
+              (when options
+                (concat "["
+                        (if (listp options)
+                            (org-latex--make-option-string options)
+                          options)
+                        "]")))
+             (engraved-wrapped
+              (if inline
+                  (concat "\\Verb" engraved-options "{" engraved-code "}")
+                (concat "\\begin{Code}\n\\begin{Verbatim}" engraved-options "\n"
+                        engraved-code "\n\\end{Verbatim}\n\\end{Code}"))))
         (kill-buffer engraved-buffer)
-        engraved-code)
+        (if theme
+            (concat "{\\engravedtheme"
+                    (replace-regexp-in-string "[^A-Za-z]" ""
+                                              (symbol-name theme))
+                    engraved-wrapped
+                    "}")
+          engraved-wrapped))
     (user-error "Cannot engrave code as `engrave-faces-latex' is unavailible.")))
 
 (cl-defun org-latex-src-block--engraved
@@ -3392,7 +3464,15 @@ (cl-defun org-latex-src-block--engraved
                             placement)
                     "%s\n\\end{listing}"))
            (t "%s")))
-         (options (plist-get info :latex-engraved-options))
+         (options
+          (let ((engraved-options (plist-get info :latex-engraved-options))
+                (local-options (plist-get attributes :options)))
+            (append
+             (when (and num-start (not (assoc "linenos" engraved-options)))
+               `(("linenos")
+                 ("firstnumber" ,(number-to-string (1+ num-start)))))
+             (and local-options (list local-options)))))
+         (engraved-theme (plist-get attributes :engraved-theme))
          (content
           (let* ((code-info (org-export-unravel-code src-block))
                  (max-width
@@ -3414,18 +3494,10 @@ (cl-defun org-latex-src-block--engraved
                           (format "(%s)" ref)))))
              nil (and retain-labels (cdr code-info)))))
          (body
-          (format
-           "\\begin{Code}\n\\begin{Verbatim}[%s]\n%s\\end{Verbatim}\n\\end{Code}"
-           ;; Options.
-           (concat
-            (org-latex--make-option-string
-             (append
-              (when (and num-start (not (assoc "linenos" options)))
-                `(("linenos")
-                  ("firstnumber" ,(number-to-string (1+ num-start)))))
-              (let ((local-options (plist-get attributes :options)))
-                (and local-options (list local-options))))))
-           (org-latex-src--engrave-code content lang))))
+          (org-latex-src--engrave-code
+           content lang
+           (when engraved-theme (intern engraved-theme))
+           options)))
     (format float-env body)))
 
 (cl-defun org-latex-src-block--listings
-- 
2.35.3


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From 7d9306fe8ada094ff6964422cc527645eb9ffc55 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Mon, 9 May 2022 00:04:10 +0800
Subject: [PATCH 10/13] ox-latex: Fix %-captions in minted/engraved code

* lisp/ox-latex.el (org-latex-src-block--engraved,
org-latex-src-block--minted): Refactor float-env to be clearer, and
switch from `format' to `concat' to fix the bug where %-chars in
captions are interpreted as a format specifier.
---
 lisp/ox-latex.el | 55 +++++++++++++++++++++---------------------------
 1 file changed, 24 insertions(+), 31 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 9634461bd..ceb1bd483 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3330,23 +3330,20 @@ (cl-defun org-latex-src-block--minted
   (let* ((caption-str (org-latex--caption/label-string src-block info))
          (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
                         (plist-get info :latex-default-figure-position)))
+         (multicolumn-p (string= "multicolumn" float))
          (float-env
           (cond
-           ((string= "multicolumn" float)
-            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
-           (caption
-            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
+           ((or caption multicolumn-p)
+            (cons
+             (concat "\\begin{listing" (when multicolumn-p "*")
+                     "}[" placement "]\n"
+                     (if caption-above-p caption-str ""))
+             (concat "\n" (if caption-above-p "" caption-str)
+                     "\\end{listing" (when multicolumn-p "*") "}")))
            ((string= "t" float)
-            (concat (format "\\begin{listing}[%s]\n"
-                            placement)
-                    "%s\n\\end{listing}"))
-           (t "%s")))
+            (cons
+             (concat "\\begin{listing}[" placement "]\n")
+             "\n\\end{listing}"))))
          (options (plist-get info :latex-minted-options))
          (body
           (format
@@ -3386,8 +3383,7 @@ (cl-defun org-latex-src-block--minted
                                         ?\s)
                            (format "(%s)" ref)))))
               nil (and retain-labels (cdr code-info)))))))
-    ;; Return value.
-    (format float-env body)))
+    (concat (car float-env) body (cdr float-env))))
 
 (defun org-latex-src--engrave-code (content lang &optional theme options inline)
   "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
@@ -3447,23 +3443,20 @@ (cl-defun org-latex-src-block--engraved
   (let* ((caption-str (org-latex--caption/label-string src-block info))
          (placement (or (org-unbracket-string "[" "]" (plist-get attributes :placement))
                         (plist-get info :latex-default-figure-position)))
+         (multicolumn-p (string= "multicolumn" float))
          (float-env
           (cond
-           ((string= "multicolumn" float)
-            (format "\\begin{listing*}[%s]\n%s%%s\n%s\\end{listing*}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
-           (caption
-            (format "\\begin{listing}[%s]\n%s%%s\n%s\\end{listing}"
-                    placement
-                    (if caption-above-p caption-str "")
-                    (if caption-above-p "" caption-str)))
+           ((or caption multicolumn-p)
+            (cons
+             (concat "\\begin{listing" (when multicolumn-p "*")
+                     "}[" placement "]\n"
+                     (if caption-above-p caption-str ""))
+             (concat "\n" (if caption-above-p "" caption-str)
+                     "\\end{listing" (when multicolumn-p "*") "}")))
            ((string= "t" float)
-            (concat (format "\\begin{listing}[%s]\n"
-                            placement)
-                    "%s\n\\end{listing}"))
-           (t "%s")))
+            (cons
+             (concat "\\begin{listing}[" placement "]\n")
+             "\n\\end{listing}"))))
          (options
           (let ((engraved-options (plist-get info :latex-engraved-options))
                 (local-options (plist-get attributes :options)))
@@ -3498,7 +3491,7 @@ (cl-defun org-latex-src-block--engraved
            content lang
            (when engraved-theme (intern engraved-theme))
            options)))
-    (format float-env body)))
+    (concat (car float-env) body (cdr float-env))))
 
 (cl-defun org-latex-src-block--listings
     (&key src-block info lang caption caption-above-p label num-start retain-labels attributes float &allow-other-keys)
-- 
2.35.3


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From 5fdbbbe811a4d15fa1f7fa4bfad9d3e11e6f4eb8 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 11 May 2022 23:18:19 +0800
Subject: [PATCH 11/13] ox-latex: Support mathescape'd code with engraved

* lisp/ox-latex.el (org-latex-src-block--engraved,
org-latex-src--engrave-mathescape-p): Using the mathescape functionality
in engrave-faces-latex v0.3.1, we can support the mathescape option of
fvextra well.  Along the way, we fix a minor issue with the localoptions
list in `org-latex-src-block--engraved`.
---
 lisp/ox-latex.el | 46 +++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 41 insertions(+), 5 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index ceb1bd483..29543f8e9 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3385,6 +3385,40 @@ (cl-defun org-latex-src-block--minted
               nil (and retain-labels (cdr code-info)))))))
     (concat (car float-env) body (cdr float-env))))
 
+(defun org-latex-src--engrave-mathescape-p (info options)
+  "From the export INFO plist, and the per-block OPTIONS, determine mathescape."
+  (let ((default-options (plist-get info :latex-engraved-options))
+        (mathescape-status
+         (lambda (opts)
+           (cl-some
+            (lambda (opt)
+              (or (and
+                   (null (cdr opt))
+                   (cond
+                    ((string-match-p
+                      "\\(?:^\\|,\\)mathescape=false\\(?:,\\|$\\)"
+                      (car opt))
+                     'no)
+                    ((or (string-match-p
+                          "\\(?:^\\|,\\)mathescape\\(?:=true\\)?\\(?:,\\|$\\)"
+                          (car opt))
+                         (string= "mathescape" (car opt)))
+                     'yes)))
+                  (and
+                   (string= (car opt) "mathescape")
+                   (cond
+                    ((or (and (stringp (cdr opt)) (string= (cdr opt) "true"))
+                         (equal '("true") (cdr opt)))
+                     'yes)
+                    ((or (and (stringp (cdr opt)) (string= "false" (cdr opt)))
+                         (equal '("false") (cdr opt)))
+                     'no)))))
+            opts))))
+    (if-let ((mathescape (or (funcall mathescape-status default-options)
+                             (funcall mathescape-status options))))
+        (when (eq mathescape 'yes)
+          (or engrave-faces-latex-mathescape t)))))
+
 (defun org-latex-src--engrave-code (content lang &optional theme options inline)
   "Engrave CONTENT to LaTeX in a LANG-mode buffer, and give the result.
 When the THEME symbol is non-nil, that theme will be used.
@@ -3464,7 +3498,7 @@ (cl-defun org-latex-src-block--engraved
              (when (and num-start (not (assoc "linenos" engraved-options)))
                `(("linenos")
                  ("firstnumber" ,(number-to-string (1+ num-start)))))
-             (and local-options (list local-options)))))
+             (and local-options `((,local-options))))))
          (engraved-theme (plist-get attributes :engraved-theme))
          (content
           (let* ((code-info (org-export-unravel-code src-block))
@@ -3487,10 +3521,12 @@ (cl-defun org-latex-src-block--engraved
                           (format "(%s)" ref)))))
              nil (and retain-labels (cdr code-info)))))
          (body
-          (org-latex-src--engrave-code
-           content lang
-           (when engraved-theme (intern engraved-theme))
-           options)))
+          (let ((engrave-faces-latex-mathescape
+                 (org-latex-src--engrave-mathescape-p info options)))
+            (org-latex-src--engrave-code
+             content lang
+             (when engraved-theme (intern engraved-theme))
+             options))))
     (concat (car float-env) body (cdr float-env))))
 
 (cl-defun org-latex-src-block--listings
-- 
2.35.3


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From a57baf2c0f863aba49264875fd93d62a602ec0d9 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Thu, 12 May 2022 00:03:11 +0800
Subject: [PATCH 12/13] news and manual: Mention ox-latex's engraved code

* etc/ORG-NEWS: Mention the addition of the "engraved" source block
transcoding backend.

* doc/org-manual.org (Footnotes, LaTeX specific properties, Source
blocks in LaTeX export): Basic documentation on the "engraved" source
block transcoding backend.
---
 doc/org-manual.org | 25 ++++++++++++++++---------
 etc/ORG-NEWS       |  9 +++++++++
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/doc/org-manual.org b/doc/org-manual.org
index 60bded419..7cba5f18d 100644
--- a/doc/org-manual.org
+++ b/doc/org-manual.org
@@ -13811,22 +13811,26 @@ *** Source blocks in LaTeX export
 
 #+vindex: org-latex-listings-options
 #+vindex: org-latex-minted-options
+#+vindex: org-latex-engraved-options
 The LaTeX export back-end passes string values in =:options= to LaTeX
 packages for customization of that specific source block.  In the
-example below, the =:options= are set for Minted.  Minted is a source
-code highlighting LaTeX package with many configurable options[fn:134].
+example below, the =:options= are set for Engraved or Minted.  Minted
+is a source code highlighting LaTeX package with many configurable
+options[fn:134].  Both Minted and Engraved are built on [[https://www.ctan.org/pkg/fvextra][fvextra]], and
+so support many of the same options.
 
 #+begin_example
-,#+ATTR_LATEX: :options commentstyle=\bfseries
+,#+ATTR_LATEX: :options mathescape
 ,#+BEGIN_SRC emacs-lisp
-  (defun Fib (n)
+  (defun Fib (n) ; $n_i = n_{i-2} + n_{i-1}$
     (if (< n 2) n (+ (Fib (- n 1)) (Fib (- n 2)))))
 ,#+END_SRC
 #+end_example
 
-To apply similar configuration options for all source blocks in
-a file, use the ~org-latex-listings-options~ and
-~org-latex-minted-options~ variables.
+To apply similar configuration options for all source blocks in a
+file, use the ~org-latex-listings-options~,
+~org-latex-engraved-options~, and ~org-latex-minted-options~
+variables.
 
 *** Example blocks in LaTeX export
 :PROPERTIES:
@@ -16289,6 +16293,9 @@ **** LaTeX specific properties
 | ~:latex-default-table-environment~     | ~org-latex-default-table-environment~     |
 | ~:latex-default-table-mode~            | ~org-latex-default-table-mode~            |
 | ~:latex-diary-timestamp-format~        | ~org-latex-diary-timestamp-format~        |
+| ~:latex-engraved-options~              | ~org-latex-engraved-options~              |
+| ~:latex-engraved-preamble~             | ~org-latex-engraved-preamble~             |
+| ~:latex-engraved-theme~                | ~org-latex-engraved-theme~                |
 | ~:latex-footnote-defined-format~       | ~org-latex-footnote-defined-format~       |
 | ~:latex-footnote-separator~            | ~org-latex-footnote-separator~            |
 | ~:latex-format-drawer-function~        | ~org-latex-format-drawer-function~        |
@@ -22255,8 +22262,8 @@ * Footnotes
 [fn:114] This works automatically for the HTML backend (it requires
 version 1.34 of the =htmlize.el= package, which you need to install).
 Fontified code chunks in LaTeX can be achieved using either the
-[[https://www.ctan.org/pkg/listings][listings]] package or the [[https://www.ctan.org/pkg/minted][minted]] package.  Refer to
-~org-latex-src-block-backend~ for details.
+[[https://www.ctan.org/pkg/listings][listings]] LaTeX package, [[https://www.ctan.org/pkg/minted][minted]] LaTeX package, or by using
+[[https://elpa.gnu.org/packages/engrave-faces.html][engrave-faces]] .  Refer to ~org-latex-src-block-backend~ for details.
 
 [fn:115] Source code in code blocks may also be evaluated either
 interactively or on export.  See [[*Working with Source Code]] for more
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index ebb3cd649..582816534 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -180,6 +180,15 @@ commands.
 =:noweb-prefix= can be set to =no= to prevent the prefix characters
 from being repeated when expanding a multiline noweb reference.
 
+*** New LaTeX source block backend using =engraved-faces-latex=
+
+When ~org-latex-src-block-backend~ is set to ~engraved~,
+=engrave-faces-latex= from [[http://elpa.gnu.org/packages/engrave-faces.html][engrave-faces]] is used to transcode source
+blocks to LaTeX. This requires the =fvextra=, =float=, and (by
+default, but not necessarily) =tcolorbox= LaTeX packages be
+installed. It uses Emacs' font-lock information, and so tends to
+produce results superior to Minted or Listings.
+
 ** New functions and changes in function arguments
 
 *** New function ~org-element-cache-map~ for quick mapping across Org elements
-- 
2.35.3


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From c3851e657611424af10859a2236c0b4e183cc1d7 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Wed, 11 May 2022 21:50:36 +0800
Subject: [PATCH 13/13] ox-latex: Prefix lst: to source block labels

* lisp/ox-latex.el (org-latex--label): Use the "lst:" prefix when
generating source block labels ("lst" contracted from "listing").
---
 lisp/ox-latex.el | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 29543f8e9..998f2238d 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1554,6 +1554,7 @@ (defun org-latex--label (datum info &optional force full)
 			   (`paragraph
 			    (and (org-element-property :caption datum)
 				 "fig:"))
+                           (`src-block "lst:")
 			   (_ nil))
 			 (org-export-get-reference datum info))))))
     (cond ((not full) label)
-- 
2.35.3

Re: [PATCH] (v3) New LaTeX code export option: engraved

[Daniel Fleischer]

Looks good. I had to update `engrave-faces' to 0.3 because of new
variables/functions and it works now. It does what it says on the box so
let's move forward introducing these changes and be open to feedback.

Thank you very much for introducing this feature!

-- 

Daniel Fleischer

Re: [PATCH] (v3) New LaTeX code export option: engraved

[Timothy]

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Hi Daniel,

> Looks good. I had to update `engrave-faces’ to 0.3 because of new
> variables/functions and it works now. It does what it says on the box so
> let’s move forward introducing these changes and be open to feedback.
>
> Thank you very much for introducing this feature!

That’s great to hear! I’ve just tagged and pushed 0.3.1 of engrave-faces, so
HEAD is no longer required, along with my patch of ox-latex commits.

Thanks for helping with the process of getting this in, this has been over a
year in the works and so it feels fantastic to have this feature in-tree at last!

All the best,
Timothy

Re: [PATCH] New LaTeX code export option: engraved

[Max Nikulin]

On 05/05/2022 22:17, Timothy wrote:
> Subject: [PATCH 1/4] ox-latex: Refactor `org-latex-src-block'

When I was trying to fix an issue with caption, I was not brave enough 
for massive changes. I do not like the original code of the function.

There are some unit tests for exporting of src blocks. Maybe the new 
option should be tested as well.

> +(defun org-latex-src-block--verbatim
> +    (src-block info _lang caption caption-above-p _label
> +               _num-start _retain-labels _attributes float)

On the one hand I have no a better suggestion, but on the other hand 10 
arguments is too much for straightforward code from my point of view. 
Unsure that getting parameters in each function or passing a property 
list would not be worse however.

It reminds me a case when a colleague failed in despair trying to figure 
out what was wrong with his 15 argument fortran function. I do not 
remember exactly whether it was a missed argument or an extra one. The 
last one was assumed to be a parameter (constant) and the identifier was 
not available in debugger since compiler just substituted the number 
without creation of a symbol and it added even more confusion.

My other notes are rather loosely related to your patches. The issues 
may be postponed till someone will start a new thread for them. My hope 
is that some of them might be easily addressed so that they will not 
need separate testing.

A problem with percent sign in captions is tracked on 
updates.orgmode.org. Some environments has not fixed yet:
https://list.orgmode.org/YT2PR01MB45101E27DC6251D8F8B7B366F6EC9@YT2PR01MB4510.CANPRD01.PROD.OUTLOOK.COM/

That time I was puzzled why the option is named "multicolumn" while only 
regular "figure" is added:

> +    (cond ((string= "multicolumn" float)
> +           (format "\\begin{figure*}[%s]\n%s%s\n%s\\end{figure*}"

If language is added to "#+begin_example:" than the block content is 
properly fontified in the Emacs buffer. It would be great to treat such 
example similar to source block during export. When some code is not 
supposed to be executed, it is natural to use example block. I am 
curious if new functions may be reused.

Re: [PATCH] New LaTeX code export option: engraved

[Ihor Radchenko]

Max Nikulin <manikulin@gmail.com> writes:

>> +(defun org-latex-src-block--verbatim
>> +    (src-block info _lang caption caption-above-p _label
>> +               _num-start _retain-labels _attributes float)
>
> On the one hand I have no a better suggestion, but on the other hand 10 
> arguments is too much for straightforward code from my point of view. 
> Unsure that getting parameters in each function or passing a property 
> list would not be worse however.

I agree that having that many unused arguments is awkward, especially
when the arguments are repeated in all the calls.
Maybe the functions could be rewritten using cl-defun with keys and
&allow-other-keys and then called via apply on a let-bound arg plist?

Best,
Ihor

Re: [PATCH] New LaTeX code export option: engraved

[Sébastien Miquel]

Hi Timothy,

I'm quite exited and impressed to see this alternative to minted,
thank you.

I haven't been able to test your patches to org, but I have tried
engrave-faces.el. Here's a couple issues I've run into.

  1. engrave-faces-generate-preset generates emacs colors such as
     `:foreground "grey70"` which are not supported by
     engrave-faces-latex-gen-preamble-line and co.
  2. `minted` supports a `mathescape` option to render math content
     inside code. `fvextra` supports the same option, but maths
     characters are escaped by engrave-faces-latex-face-mapper.

Regards,

-- 
Sébastien Miquel

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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Hi Sebastien,

> I’m quite exited and impressed to see this alternative to minted,
> thank you.

That’s great to hear!

> I haven’t been able to test your patches to org, but I have tried
> engrave-faces.el. Here’s a couple issues I’ve run into.

Still helpful, thanks.

>  1. engrave-faces-generate-preset generates emacs colors such as
>     `:foreground “grey70”` which are not supported by
>     engrave-faces-latex-gen-preamble-line and co.

Ah. I’ve just found this snippet from `list-colors-print'
┌────
│ (apply 'format "#%02x%02x%02x"
│        (mapcar (lambda (c) (ash c -8))
│                (color-values (car color))))
└────

I’ll see if I can incorporate this into engrave-faces v0.3.1.

>  2. `minted` supports a `mathescape` option to render math content
>     inside code. `fvextra` supports the same option, but maths
>     characters are escaped by engrave-faces-latex-face-mapper.

I’l also take a look at this :)

Thanks for the comments Sebastien.

All the best,
Timothy

Re: [PATCH] New LaTeX code export option: engraved

[Timothy]

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Hi Sebastien,

>>  1. engrave-faces-generate-preset generates emacs colors such as
>>     `:foreground “grey70”` which are not supported by
>>     engrave-faces-latex-gen-preamble-line and co.
>
> I’ll see if I can incorporate this into engrave-faces v0.3.1.

Done.

>>  2. `minted` supports a `mathescape` option to render math content
>>     inside code. `fvextra` supports the same option, but maths
>>     characters are escaped by engrave-faces-latex-face-mapper.
>
> I’l also take a look at this :)

Implemented in engrave-faces-latex, but not worked into ox-html yet. If you
could check it out on the engrave-faces-latex side and check it’s behaving
sanely, that would be helpful.

All the best,
Timothy

Re: [PATCH] New LaTeX code export option: engraved

[Sébastien Miquel]

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Hi,

Timothy writes:
>>>   2. `minted` supports a `mathescape` option to render math content
>>>      inside code. `fvextra` supports the same option, but maths
>>>      characters are escaped by engrave-faces-latex-face-mapper.
>> I’l also take a look at this:)
> Implemented in engrave-faces-latex, but not worked into ox-html yet. If you
> could check it out on the engrave-faces-latex side and check it’s behaving
> sanely, that would be helpful.

I've tried it, and mathescape works, thanks !

-- 
Sébastien Miquel

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