Dear Org Mode developers,
I am writing to report a bug in the LaTeX export pipeline in Org Mode 9.7.11 as
packaged with the Snap version of Emacs 31.0.50. The issue appears to stem from
a recent change in `org-latex-compile` which results in the following error
when exporting to PDF:
Debugger entered--Lisp error: (wrong-type-argument sequencep t)
latexenc-find-file-coding-system((insert-file-contents
"/path/to/file.tex" nil nil nil nil))
This appears to result from a malformed call to
`latexenc-find-file-coding-system`, where the return value of
`(insert-file-contents ...)` — likely `t` or a cons cell — is passed instead of
a string (filename) or buffer.
This issue began recently and was not present in previous versions of Org or
Emacs. My Emacs and Org versions are:
- Emacs: 31.0.50 (installed via Snap)
- Org: 9.7.11 (release_9.7.11 @
/snap/emacs/current/usr/share/emacs/31.0.50/lisp/org/)
The error is triggered consistently on any call to `org-latex-export-to-pdf`.
### Temporary Workaround
I have temporarily resolved the issue by overriding `org-latex-compile` in my
init file to avoid the faulty encoding detection step. This workaround bypasses
the use of `latexenc-find-file-coding-system` entirely:
```emacs-lisp
(defun org-latex-compile (texfile &optional snippet)
"Custom LaTeX compile function that avoids latexenc bug in Org 9.7.11."
(unless (and texfile (stringp texfile))
(error "Invalid texfile: %S" texfile))
(let* ((texfile (expand-file-name texfile))
(output-dir (file-name-directory texfile))
(pdf-file (concat (file-name-sans-extension texfile) ".pdf"))
(command (format "pdflatex -interaction nonstopmode -output-directory
%s %s"
(shell-quote-argument output-dir)
(shell-quote-argument texfile))))
(with-current-buffer (get-buffer-create "*Org PDF LaTeX Output*")
(erase-buffer)
(shell-command command (current-buffer)))
(if (file-exists-p pdf-file)
pdf-file
(error "PDF file was not produced"))))
I would be grateful if this could be confirmed and fixed in an upcoming release
of Org 9.7.x.
Please let me know if you require a minimal .org file or further details to
reproduce the issue.
Kind regards,
Stephen Wheeler
Lancashire UK
