[PATCH] Change default latex compiler to latexmk

[Timothy <tecosaur@gmail.com>]

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Hey all,

From the earlier discussion on this, I got feeling a consensus had
reached that this is a good idea, as long as we check that latexmk is
available first.
As such, here is a patch changing the default LaTeX compiler to latexmk
--- as long as it's available. For what it's worth I've been using this
exact command in my personal config for months now, and it's worked
excellently.

--
Timothy


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From 95806243e40d5f9f19a8db71e2b8b0cd0c5fdb68 Mon Sep 17 00:00:00 2001
From: TEC <tec@tecosaur.com>
Date: Mon, 7 Jun 2021 00:46:09 +0800
Subject: [PATCH] ox-latex: Change default compiler to latexmk

* lisp/ox-latex.el (org-latex-pdf-process): Check for the presence of
latexmk when setting the default, and use it when available.  Fall back
to the current default.  This is important for the incoming citation
support, as PDF generation will now need to involve bibliography
generation.  By using latexmk this is taken care of for us.  The -%latex
part of the command is slightly hacky, but allows latexmk to behave more
intelligently for non-pdflatex options.  Note that latexmk also seems to
care about the order of the arguments.
---
 lisp/ox-latex.el | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 9724b0d87..c761cfd7f 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -1165,9 +1165,11 @@ (defcustom org-latex-bib-compiler "bibtex"
   :package-version '(Org . "9.0"))
 
 (defcustom org-latex-pdf-process
-  '("%latex -interaction nonstopmode -output-directory %o %f"
-    "%latex -interaction nonstopmode -output-directory %o %f"
-    "%latex -interaction nonstopmode -output-directory %o %f")
+  (if (executable-find "latexmk")
+      '("latexmk -f -pdf -%latex -interaction=nonstopmode -output-directory=%o %f")
+    '("%latex -interaction nonstopmode -output-directory %o %f"
+      "%latex -interaction nonstopmode -output-directory %o %f"
+      "%latex -interaction nonstopmode -output-directory %o %f"))
   "Commands to process a LaTeX file to a PDF file.
 
 This is a list of strings, each of them will be given to the
@@ -1211,7 +1213,7 @@ (defcustom org-latex-pdf-process
 	  (const :tag "texi2dvi"
 		 ("cd %o; LATEX=\"%latex\" texi2dvi -p -b -V %b.tex"))
 	  (const :tag "latexmk"
-		 ("latexmk -g -pdf -pdflatex=\"%latex\" -outdir=%o %f"))
+		 ("latexmk -f -pdf -%latex -interaction=nonstopmode -output-directory=%o %f"))
 	  (function)))
 
 (defcustom org-latex-logfiles-extensions
-- 
2.31.1