[PATCH] Re: [BUG] Set org-format-latex-options in .dir-locals.el [9.5.1 (release_9.5.1-11-g96d91b @ emacs-28.0.90/lisp/org/)]

[Ihor Radchenko]

Y. E. via "General discussions about Org-mode." <emacs-orgmode@gnu.org>
writes:

> Hello,
>
> I tried configuring 'org-format-latex-options' per a org-mode
> file/directory by adding the following configuration into the
> .dir-locals.el file:
> The file settings I use:
>
> #+STARTUP: content latexpreview
> #+OPTIONS: tex:dvisvgm html-style:nil
> #+HTML_HEAD: <link rel="stylesheet" type="text/css" href="style.css" />
>
> The LaTeX formulas are embedded into the text as shown here:
> https://orgmode.org/manual/LaTeX-fragments.html
>
> Am I overlooking something?

Nope. This is a bug.

It happens because LaTeX fragments are processed in temporary buffer and
all the buffer-local variables you set in the original org buffer are
discarded.

The fix is attached.

Nicolas, this kind of error might be present in various places of export
library. You may want to fix it in more places than what I propose in
this patch.

Best,
Ihor

>From 37a37862a17c4b333164edffbac97f8a56052e88 Mon Sep 17 00:00:00 2001
Message-Id: 
<37a37862a17c4b333164edffbac97f8a56052e88.1651832231.git.yantar92@gmail.com>
From: Ihor Radchenko <yantar92@gmail.com>
Date: Fri, 6 May 2022 18:14:05 +0800
Subject: [PATCH] org-html-format-latex: Preserve buffer-local settings

* lisp/ox-html.el (org-html-format-latex): Carry over buffer-local
variables when create LaTeX images.  Use `org-export-with-buffer-copy'
instead of `with-temp-buffer'.

Fixes https://orgmode.org/list/m2fsqr75md.fsf@ego.team
---
 lisp/ox-html.el | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 81ef002a0..7f2087a46 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -2872,11 +2872,12 @@ (defun org-html-format-latex (latex-frag 
processing-type info)
        ;; temporary buffer so that dvipng/imagemagick can properly
        ;; turn the fragment into an image.
        (setq latex-frag (concat latex-header latex-frag))))
-    (with-temp-buffer
-      (insert latex-frag)
-      (org-format-latex cache-relpath nil nil cache-dir nil
-                       "Creating LaTeX Image..." nil processing-type)
-      (buffer-string))))
+    (org-export-with-buffer-copy
+     (erase-buffer)
+     (insert latex-frag)
+     (org-format-latex cache-relpath nil nil cache-dir nil
+                      "Creating LaTeX Image..." nil processing-type)
+     (buffer-string))))
 
 (defun org-html--wrap-latex-environment (contents _ &optional caption label)
   "Wrap CONTENTS string within appropriate environment for equations.
-- 
2.35.1