Re: prettify-symbols-mode in org agenda?

[Ihor Radchenko <yantar92@gmail.com>]

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Ihor Radchenko <yantar92@gmail.com> writes:

> Bastien <bzg@gnu.org> writes:
>> Could it slow down agenda generation for some configurations?

> The total slowdown is ~30%, though the second part will only be slow
> before the headings are fontified first time by
> org-buffer-substring-fontified. Subsequent agenda rebuilds will be
> faster.

I have updated the code to avoid creating temporary org buffers. Now, I
got 8% slowdown during first agenda run. The slowdown diminishes as the
headlines contributing to agenda get fontified (i.e. for all next
org-agenda-redo).

> Please move the comments after the change log themselves.

Done.

> Here and for the rest of the patch: please try to keep lines below 80
> characters.  I'm aware this is not always feasible, especially given
> long functions with many nested s-exps, but let's try to come as close
> as possible to 80.

Done.

William Xu <william.xwl@gmail.com> writes:
> The only issue I still see, is that when you org-agenda-redo-all, or
> org-agenda-log-mode (which triggers org-agenda-redo-all), the
> prettify gets lost again. Maybe org-buffer-substring-fontified call is
> also required somewhere during org-agenda-redo-all? 

I managed to reproduce it. This time, I went through all the agenda.el
and updated places where the strings are fetched from Org buffers into
agenda. The updated patch is attached.

Best,
Ihor


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From 8a6f629669772ff4561180ace320eb0a6365969f Mon Sep 17 00:00:00 2001
Message-Id: <8a6f629669772ff4561180ace320eb0a6365969f.1620134057.git.yantar92@gmail.com>
From: Ihor Radchenko <yantar92@gmail.com>
Date: Tue, 4 May 2021 20:33:10 +0800
Subject: [PATCH] Make sure that fontification is preserved in agenda

* lisp/org-macs.el (org-string-width): Refactor old code and add
optional argument to return pixel width.  The old code used manual
parsing of text properties to find which parts of string are visible.
The new code defers this work to Emacs display engine via
`window-text-pixel-size'.  The visibility settings of current buffer
are taken into account.

(org--string-from-props): Removed.  It was only used by old
`org-string-width' code.

(org-buffer-substring-fontified): New function. Like
`buffer-substring', but make sure that the substring is fontified.

(org-looking-at-fontified): New function.  Like `looking-at', but make
sure that the match is fontified.

* lisp/org.el (org-get-heading): Make sure that heading is fontified.

(org--get-local-tags, org-get-tags): Add optional argument
`fontified'.  When non-nil, the returned tags are fontified.

* lisp/org-agenda.el (org-agenda-get-todos, org-agenda-get-progress,
org-agenda-get-deadlines, org-agenda-get-scheduled,
org-agenda-fix-displayed-tags, org-search-view, org-agenda-get-todos,
org-agenda-get-timestamps, org-agenda-get-sexps,
org-agenda-get-deadlines, org-agenda-get-progress,
org-agenda-get-blocks): Make sure that fontification is the same with
original Org buffers.

(org-agenda-highlight-todo): Preserve composition property used,
i.e. by `prettify-symbols-mode'.  The composition is usually set to be
removed on text change, so we do the changes inside
`with-silent-modifications'.

(org-agenda-align-tags): Use pixel width and (space . :align-to)
'display property to align tags in agenda.

Preserve fontification and composition of headlines and tags in
agenda.  If the headlines/tags are not yet fontified when building
agenda, make sure that they are fontified in the original Org mode
buffers first.

In addition, tags alignment is now done pixel-wise to avoid alignment
issues with variable-pitch symbols that may appear in fontified Org
mode buffers.  The alignment is utilising :align-to specification,
which means that the alignment will be automatically updated as the
agenda buffer is resized.
---
 lisp/org-agenda.el |  92 ++++++++++++++++++-------------
 lisp/org-macs.el   | 134 +++++++++++++++++++++++----------------------
 lisp/org.el        |  24 +++++---
 3 files changed, 138 insertions(+), 112 deletions(-)

diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 4c34ca5fe..420579ecf 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -3984,7 +3984,7 @@ (defun org-agenda-finalize ()
 		  (put-text-property (point-at-bol) (point-at-eol)
 				     'tags
 				     (org-with-point-at mrk
-				       (org-get-tags))))))))
+				       (org-get-tags nil nil t))))))))
 	(setq org-agenda-represented-tags nil
 	      org-agenda-represented-categories nil)
 	(when org-agenda-top-headline-filter
@@ -4778,10 +4778,11 @@ (defun org-search-view (&optional todo-only string edit-at)
 				  (and (eq org-agenda-show-inherited-tags t)
 				       (or (eq org-agenda-use-tag-inheritance t)
 					   (memq 'todo org-agenda-use-tag-inheritance))))
-			      tags (org-get-tags nil (not inherited-tags))
+			      tags (org-get-tags
+                                    nil (not inherited-tags) t)
 			      txt (org-agenda-format-item
 				   ""
-				   (buffer-substring-no-properties
+				   (org-buffer-substring-fontified
 				    beg1 (point-at-eol))
 				   level category tags t))
 			(org-add-props txt props
@@ -5562,7 +5563,8 @@ (defun org-agenda-get-todos ()
 	      ts-date-pair (org-agenda-entry-get-agenda-timestamp (point))
 	      ts-date (car ts-date-pair)
 	      ts-date-type (cdr ts-date-pair)
-	      txt (org-trim (buffer-substring (match-beginning 2) (match-end 0)))
+	      txt (org-trim (org-buffer-substring-fontified
+                             (match-beginning 2) (match-end 0)))
 	      inherited-tags
 	      (or (eq org-agenda-show-inherited-tags 'always)
 		  (and (listp org-agenda-show-inherited-tags)
@@ -5570,7 +5572,7 @@ (defun org-agenda-get-todos ()
 		  (and (eq org-agenda-show-inherited-tags t)
 		       (or (eq org-agenda-use-tag-inheritance t)
 			   (memq 'todo org-agenda-use-tag-inheritance))))
-	      tags (org-get-tags nil (not inherited-tags))
+	      tags (org-get-tags nil (not inherited-tags) t)
 	      level (make-string (org-reduced-level (org-outline-level)) ? )
 	      txt (org-agenda-format-item "" txt level category tags t)
 	      priority (1+ (org-get-priority txt)))
@@ -5787,10 +5789,10 @@ (defun org-agenda-get-timestamps (&optional deadlines)
 			     (or (eq org-agenda-use-tag-inheritance t)
 				 (memq 'agenda
 				       org-agenda-use-tag-inheritance)))))
-		   (tags (org-get-tags nil (not inherited-tags)))
+		   (tags (org-get-tags nil (not inherited-tags) t))
 		   (level (make-string (org-reduced-level (org-outline-level))
 				       ?\s))
-		   (head (and (looking-at "\\*+[ \t]+\\(.*\\)")
+		   (head (and (org-looking-at-fontified "\\*+[ \t]+\\(.*\\)")
 			      (match-string 1)))
 		   (inactive? (= (char-after pos) ?\[))
 		   (habit? (and (fboundp 'org-is-habit-p) (org-is-habit-p)))
@@ -5839,7 +5841,7 @@ (defun org-agenda-get-sexps ()
 	(setq b (point))
 	(forward-sexp 1)
 	(setq sexp (buffer-substring b (point)))
-	(setq sexp-entry (if (looking-at "[ \t]*\\(\\S-.*\\)")
+	(setq sexp-entry (if (org-looking-at-fontified "[ \t]*\\(\\S-.*\\)")
 			     (org-trim (match-string 1))
 			   ""))
 	(setq result (org-diary-sexp-entry sexp sexp-entry date))
@@ -5854,7 +5856,7 @@ (defun org-agenda-get-sexps ()
 		    (and (eq org-agenda-show-inherited-tags t)
 			 (or (eq org-agenda-use-tag-inheritance t)
 			     (memq 'agenda org-agenda-use-tag-inheritance))))
-		tags (org-get-tags nil (not inherited-tags))
+		tags (org-get-tags nil (not inherited-tags) t)
 		todo-state (org-get-todo-state)
 		warntime (get-text-property (point) 'org-appt-warntime)
 		extra nil)
@@ -5973,7 +5975,8 @@ (defun org-agenda-get-progress ()
 	      clockp (not (or closedp statep))
 	      state (and statep (match-string 2))
 	      category (org-get-category (match-beginning 0))
-	      timestr (buffer-substring (match-beginning 0) (point-at-eol)))
+	      timestr (org-buffer-substring-fontified
+                       (match-beginning 0) (point-at-eol)))
 	(when (string-match "\\]" timestr)
 	  ;; substring should only run to end of time stamp
 	  (setq rest (substring timestr (match-end 0))
@@ -5990,10 +5993,12 @@ (defun org-agenda-get-progress ()
 		(cond
 		 ((not org-agenda-log-mode-add-notes) nil)
 		 (statep
-		  (and (looking-at ".*\\\\\n[ \t]*\\([^-\n \t].*?\\)[ \t]*$")
+		  (and (org-looking-at-fontified
+                        ".*\\\\\n[ \t]*\\([^-\n \t].*?\\)[ \t]*$")
 		       (match-string 1)))
 		 (clockp
-		  (and (looking-at ".*\n[ \t]*-[ \t]+\\([^-\n \t].*?\\)[ \t]*$")
+		  (and (org-looking-at-fontified
+                        ".*\n[ \t]*-[ \t]+\\([^-\n \t].*?\\)[ \t]*$")
 		       (match-string 1)))))
 	  (if (not (re-search-backward org-outline-regexp-bol nil t))
 	      (throw :skip nil)
@@ -6006,9 +6011,9 @@ (defun org-agenda-get-progress ()
 		      (and (eq org-agenda-show-inherited-tags t)
 			   (or (eq org-agenda-use-tag-inheritance t)
 			       (memq 'todo org-agenda-use-tag-inheritance))))
-		  tags (org-get-tags nil (not inherited-tags))
+		  tags (org-get-tags nil (not inherited-tags) t)
 		  level (make-string (org-reduced-level (org-outline-level)) ? ))
-	    (looking-at "\\*+[ \t]+\\([^\r\n]+\\)")
+	    (org-looking-at-fontified "\\*+[ \t]+\\([^\r\n]+\\)")
 	    (setq txt (match-string 1))
 	    (when extra
 	      (if (string-match "\\([ \t]+\\)\\(:[^ \n\t]*?:\\)[ \t]*$" txt)
@@ -6254,7 +6259,8 @@ (defun org-agenda-get-deadlines (&optional with-hour)
 	    (let* ((category (org-get-category))
 		   (level (make-string (org-reduced-level (org-outline-level))
 				       ?\s))
-		   (head (buffer-substring (point) (line-end-position)))
+		   (head (org-buffer-substring-fontified
+                          (point) (line-end-position)))
 		   (inherited-tags
 		    (or (eq org-agenda-show-inherited-tags 'always)
 			(and (listp org-agenda-show-inherited-tags)
@@ -6263,7 +6269,7 @@ (defun org-agenda-get-deadlines (&optional with-hour)
 			     (or (eq org-agenda-use-tag-inheritance t)
 				 (memq 'agenda
 				       org-agenda-use-tag-inheritance)))))
-		   (tags (org-get-tags nil (not inherited-tags)))
+		   (tags (org-get-tags nil (not inherited-tags) t))
 		   (time
 		    (cond
 		     ;; No time of day designation if it is only
@@ -6466,10 +6472,11 @@ (defun org-agenda-get-scheduled (&optional deadlines with-hour)
 			     (or (eq org-agenda-use-tag-inheritance t)
 				 (memq 'agenda
 				       org-agenda-use-tag-inheritance)))))
-		   (tags (org-get-tags nil (not inherited-tags)))
+		   (tags (org-get-tags nil (not inherited-tags) t))
 		   (level (make-string (org-reduced-level (org-outline-level))
 				       ?\s))
-		   (head (buffer-substring (point) (line-end-position)))
+		   (head (org-buffer-substring-fontified
+                          (point) (line-end-position)))
 		   (time
 		    (cond
 		     ;; No time of day designation if it is only a
@@ -6585,7 +6592,7 @@ (defun org-agenda-get-blocks ()
 				   (memq 'agenda org-agenda-use-tag-inheritance))))
 		      tags (org-get-tags nil (not inherited-tags)))
 		(setq level (make-string (org-reduced-level (org-outline-level)) ? ))
-		(looking-at "\\*+[ \t]+\\(.*\\)")
+		(org-looking-at-fontified "\\*+[ \t]+\\(.*\\)")
 		(setq head (match-string 1))
 		(let ((remove-re
 		       (if org-agenda-remove-timeranges-from-blocks
@@ -7119,10 +7126,11 @@ (defun org-agenda-highlight-todo (x)
 	  (when (looking-at (concat "[ \t]*\\.*\\(" re "\\) +"))
 	    (add-text-properties (match-beginning 0) (match-end 1)
 				 (list 'face (org-get-todo-face 1)))
-	    (let ((s (buffer-substring (match-beginning 1) (match-end 1))))
-	      (delete-region (match-beginning 1) (1- (match-end 0)))
-	      (goto-char (match-beginning 1))
-	      (insert (format org-agenda-todo-keyword-format s)))))
+            (let ((s (buffer-substring (match-beginning 1) (match-end 1))))
+              (with-silent-modifications
+	        (setf (buffer-substring  (match-beginning 1)
+                                         (1- (match-end 0)))
+                      (format org-agenda-todo-keyword-format s))))))
       (let ((pl (text-property-any 0 (length x) 'org-heading t x)))
 	(setq re (get-text-property 0 'org-todo-regexp x))
 	(when (and re
@@ -9530,33 +9538,39 @@ (defun org-agenda-align-tags (&optional line)
 When optional argument LINE is non-nil, align tags only on the
 current line."
   (let ((inhibit-read-only t)
-	(org-agenda-tags-column (if (eq 'auto org-agenda-tags-column)
-				    (- (window-text-width))
-				  org-agenda-tags-column))
 	(end (and line (line-end-position)))
-	l c)
+	l lp c)
     (save-excursion
       (goto-char (if line (line-beginning-position) (point-min)))
       (while (re-search-forward org-tag-group-re end t)
 	(add-text-properties
 	 (match-beginning 1) (match-end 1)
 	 (list 'face (delq nil (let ((prop (get-text-property
-					    (match-beginning 1) 'face)))
-				 (or (listp prop) (setq prop (list prop)))
-				 (if (memq 'org-tag prop)
-				     prop
-				   (cons 'org-tag prop))))))
-	(setq l (string-width (match-string 1))
-	      c (if (< org-agenda-tags-column 0)
-		    (- (abs org-agenda-tags-column) l)
-		  org-agenda-tags-column))
+					  (match-beginning 1) 'face)))
+			       (or (listp prop) (setq prop (list prop)))
+			       (if (memq 'org-tag prop)
+				   prop
+				 (cons 'org-tag prop))))))
+	(setq l (org-string-width (match-string 1))
+              lp (org-string-width (match-string 1) 'pixel)
+	      c (unless (eq org-agenda-tags-column 'auto)
+                  (if (< org-agenda-tags-column 0)
+		      (- (abs org-agenda-tags-column) l)
+		    org-agenda-tags-column)))
 	(goto-char (match-beginning 1))
 	(delete-region (save-excursion (skip-chars-backward " \t") (point))
 		       (point))
 	(insert (org-add-props
-		    (make-string (max 1 (- c (current-column))) ?\s)
-		    (plist-put (copy-sequence (text-properties-at (point)))
-			       'face nil))))
+                    " "
+		    (copy-sequence (text-properties-at (point)))
+		  'face nil
+                  'display
+                  `(space
+                    .
+                    (:align-to
+                     ,(cond
+                       ((eq org-agenda-tags-column 'auto) `(- right (,lp) 1))
+                       (t `(+ left ,c))))))))
       (goto-char (point-min))
       (org-font-lock-add-tag-faces (point-max)))))
 
diff --git a/lisp/org-macs.el b/lisp/org-macs.el
index dc0c42b6f..79e9012b7 100644
--- a/lisp/org-macs.el
+++ b/lisp/org-macs.el
@@ -868,71 +868,63 @@ (defun org-split-string (string &optional separators)
 		      results		;skip trailing separator
 		    (cons (substring string i) results)))))))
 
-(defun org--string-from-props (s property beg end)
-  "Return the visible part of string S.
-Visible part is determined according to text PROPERTY, which is
-either `invisible' or `display'.  BEG and END are 0-indices
-delimiting S."
-  (let ((width 0)
-	(cursor beg))
-    (while (setq beg (text-property-not-all beg end property nil s))
-      (let* ((next (next-single-property-change beg property s end))
-	     (props (text-properties-at beg s))
-	     (spec (plist-get props property))
-	     (value
-	      (pcase property
-		(`invisible
-		 ;; If `invisible' property in PROPS means text is to
-		 ;; be invisible, return 0.  Otherwise return nil so
-		 ;; as to resume search.
-		 (and (or (eq t buffer-invisibility-spec)
-			  (assoc-string spec buffer-invisibility-spec))
-		      0))
-		(`display
-		 (pcase spec
-		   (`nil nil)
-		   (`(space . ,props)
-		    (let ((width (plist-get props :width)))
-		      (and (wholenump width) width)))
-		   (`(image . ,_)
-                    (and (fboundp 'image-size)
-                         (ceiling (car (image-size spec)))))
-		   ((pred stringp)
-		    ;; Displayed string could contain invisible parts,
-		    ;; but no nested display.
-		    (org--string-from-props spec 'invisible 0 (length spec)))
-		   (_
-		    ;; Un-handled `display' value.  Ignore it.
-		    ;; Consider the original string instead.
-		    nil)))
-		(_ (error "Unknown property: %S" property)))))
-	(when value
-	  (cl-incf width
-		   ;; When looking for `display' parts, we still need
-		   ;; to look for `invisible' property elsewhere.
-		   (+ (cond ((eq property 'display)
-			     (org--string-from-props s 'invisible cursor beg))
-			    ((= cursor beg) 0)
-			    (t (string-width (substring s cursor beg))))
-		      value))
-	  (setq cursor next))
-	(setq beg next)))
-    (+ width
-       ;; Look for `invisible' property in the last part of the
-       ;; string.  See above.
-       (cond ((eq property 'display)
-	      (org--string-from-props s 'invisible cursor end))
-	     ((= cursor end) 0)
-	     (t (string-width (substring s cursor end)))))))
-
-(defun org-string-width (string)
+(defun org-string-width (string &optional pixels)
   "Return width of STRING when displayed in the current buffer.
-Unlike `string-width', this function takes into consideration
-`invisible' and `display' text properties.  It supports the
-latter in a limited way, mostly for combinations used in Org.
-Results may be off sometimes if it cannot handle a given
-`display' value."
-  (org--string-from-props string 'display 0 (length string)))
+Return width in pixels when PIXELS is non-nil."
+  ;; Wrap/line prefix will make `window-text-pizel-size' return too
+  ;; large value including the prefix.
+  ;; Face should be removed to make sure that all the string symbols
+  ;; are using default face with constant width.  Constant char width
+  ;; is critical to get right string width from pixel width.
+  (remove-text-properties 0 (length string)
+                          '(wrap-prefix t line-prefix t face t)
+                          string)
+  (let (;; We need to remove the folds to make sure that folded table
+        ;; alignment is not messed up.
+        (current-invisibility-spec
+         (or (and (not (listp buffer-invisibility-spec))
+                  buffer-invisibility-spec)
+             (let (result)
+               (dolist (el buffer-invisibility-spec)
+                 (unless (or (memq el
+                                   '(org-fold-drawer
+                                     org-fold-block
+                                     org-fold-outline))
+                             (and (listp el)
+                                  (memq (car el)
+                                        '(org-fold-drawer
+                                          org-fold-block
+                                          org-fold-outline))))
+                   (push el result)))
+               result)))
+        (current-char-property-alias-alist char-property-alias-alist))
+    (with-temp-buffer
+      (setq-local buffer-invisibility-spec
+                  current-invisibility-spec)
+      (setq-local char-property-alias-alist
+                  current-char-property-alias-alist)
+      (let (pixel-width symbol-width)
+        (with-silent-modifications
+          (setf (buffer-string) string)
+          (setq pixel-width
+                (if (get-buffer-window (current-buffer))
+                    (car (window-text-pixel-size
+                          nil (line-beginning-position) (point-max)))
+                  (set-window-buffer nil (current-buffer))
+                  (car (window-text-pixel-size
+                        nil (line-beginning-position) (point-max)))))
+          (unless pixels
+            (setf (buffer-string) "a")
+            (setq symbol-width
+                  (if (get-buffer-window (current-buffer))
+                      (car (window-text-pixel-size
+                            nil (line-beginning-position) (point-max)))
+                    (set-window-buffer nil (current-buffer))
+                    (car (window-text-pixel-size
+                          nil (line-beginning-position) (point-max)))))))
+        (if pixels
+            pixel-width
+          (/ pixel-width symbol-width))))))
 
 (defun org-not-nil (v)
   "If V not nil, and also not the string \"nil\", then return V.
@@ -1081,6 +1073,20 @@ (defconst org-rm-props '(invisible t face t keymap t intangible t mouse-face t
 				   org-emphasis t)
   "Properties to remove when a string without properties is wanted.")
 
+(defun org-buffer-substring-fontified (beg end)
+  "Return fontified region between BEG and END."
+  (when (bound-and-true-p jit-lock-mode)
+    (save-match-data (jit-lock-fontify-now beg end)))
+  (buffer-substring beg end))
+
+(defun org-looking-at-fontified (re)
+  "Call `looking-at' and make sure that the match is fontified."
+  (prog1 (looking-at re)
+    (when (bound-and-true-p jit-lock-mode)
+      (save-match-data
+        (jit-lock-fontify-now (match-beginning 0)
+                              (match-end 0))))))
+
 (defsubst org-no-properties (s &optional restricted)
   "Remove all text properties from string S.
 When RESTRICTED is non-nil, only remove the properties listed
diff --git a/lisp/org.el b/lisp/org.el
index f3a33d8b3..43f9dc25d 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -7073,7 +7073,7 @@ (defun org-get-heading (&optional no-tags no-todo no-priority no-comment)
     (save-excursion
       (org-back-to-heading t)
       (let ((case-fold-search nil))
-	(looking-at org-complex-heading-regexp)
+	(org-looking-at-fontified org-complex-heading-regexp)
 	(let ((todo (and (not no-todo) (match-string 2)))
 	      (priority (and (not no-priority) (match-string 3)))
 	      (headline (pcase (match-string 4)
@@ -12372,13 +12372,17 @@ (defun org-make-tag-string (tags)
   (if (null tags) ""
     (format ":%s:" (mapconcat #'identity tags ":"))))
 
-(defun org--get-local-tags ()
+(defun org--get-local-tags (&optional fontified)
   "Return list of tags for the current headline.
-Assume point is at the beginning of the headline."
-  (and (looking-at org-tag-line-re)
-       (split-string (match-string-no-properties 2) ":" t)))
+Assume point is at the beginning of the headline.
 
-(defun org-get-tags (&optional pos local)
+The tags are fontified when FONTIFY is non-nil."
+  (and (if fontified
+           (org-looking-at-fontified org-tag-line-re)
+         (looking-at org-tag-line-re))
+       (split-string (match-string 2) ":" t)))
+
+(defun org-get-tags (&optional pos local fontify)
   "Get the list of tags specified in the current headline.
 
 When argument POS is non-nil, retrieve tags for headline at POS.
@@ -12393,7 +12397,9 @@ (defun org-get-tags (&optional pos local)
 However, when optional argument LOCAL is non-nil, only return
 tags specified at the headline.
 
-Inherited tags have the `inherited' text property."
+Inherited tags have the `inherited' text property.
+
+The tags are fontified when FONTIFY is non-nil."
   (if (and org-trust-scanner-tags
            (or (not pos) (eq pos (point)))
            (not local))
@@ -12401,11 +12407,11 @@ (defun org-get-tags (&optional pos local)
     (org-with-point-at (or pos (point))
       (unless (org-before-first-heading-p)
         (org-back-to-heading t)
-        (let ((ltags (org--get-local-tags)) itags)
+        (let ((ltags (org--get-local-tags fontify)) itags)
           (if (or local (not org-use-tag-inheritance)) ltags
             (while (org-up-heading-safe)
               (setq itags (nconc (mapcar #'org-add-prop-inherited
-					 (org--get-local-tags))
+					 (org--get-local-tags fontify))
 				 itags)))
             (setq itags (append org-file-tags itags))
             (nreverse
-- 
2.26.3