Subject: 12.3.1; Evince synctex integration hangs when filename contains question mark
From: Hans-Peter Deifel <[email-masked]>
To: [email-masked]
Date: Mon, 28 Dec 2020 11:17:03 +0100
List-Id: <debbugs-submit.debbugs.gnu.org>

Hello,

When enabling `TeX-source-correlate-mode', using Evince as viewer and
typing `C-c C-a' in a TeX buffer where the filename contains a question
mark renders Emacs unresponsive until some time-out. Not even C-g C-g
C-g works.

This bug seems to be caused by insufficient escaping of the ? character
when Evince's FindDocument dbus method is called in
TeX-evince-sync-view-1. Emacs passes the `?' literally in the URI
argument of FindDocument and Evince expects it to be properly escaped.

TeX-evince-sync-view-1 uses `url-encode-url' on the filename, which
unfortunately doesn't replace the question mark character specifically:

  (url-encode-url "/foo?/bar.pdf") => "/foo?/bar.pdf"

See also https://gitlab.gnome.org/GNOME/evince/-/issues/1483 for an
explanation by a developer of Evince.

Cheers,
HP

Emacs  : GNU Emacs 27.1 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.22, cairo version 1.16.0)
 of 2020-08-21
Package: 12.3.1

current state:
==============
(setq
 AUCTeX-date "2020-10-22"
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("~/.emacs.d/auctex" "/home/hpd/.emacs.d/straight/build/auctex/style"
		  "/home/hpd/.emacs.d/auctex/auto" "/home/hpd/.emacs.d/auctex/style" "auto"
		  "style")
 TeX-auto-save t
 TeX-parse-self t
 TeX-master t
 TeX-command-list '(("TeX"
		     "%(PDF)%(tex) %(file-line-error) %`%(extraopts) %S%(PDFout)%(mode)%' %t"
		     TeX-run-TeX nil (plain-tex-mode ams-tex-mode texinfo-mode) :help
		     "Run plain TeX")
		    ("LaTeX" "%`%l%(mode)%' %T" TeX-run-TeX nil (latex-mode doctex-mode)
		     :help "Run LaTeX")
		    ("Makeinfo" "makeinfo %(extraopts) %t" TeX-run-compile nil
		     (texinfo-mode) :help "Run Makeinfo with Info output")
		    ("Makeinfo HTML" "makeinfo %(extraopts) --html %t" TeX-run-compile nil
		     (texinfo-mode) :help "Run Makeinfo with HTML output")
		    ("AmSTeX" "amstex %(PDFout) %`%(extraopts) %S%(mode)%' %t" TeX-run-TeX
		     nil (ams-tex-mode) :help "Run AMSTeX")
		    ("ConTeXt" "%(cntxcom) --once --texutil %(extraopts) %(execopts)%t"
		     TeX-run-TeX nil (context-mode) :help "Run ConTeXt once")
		    ("ConTeXt Full" "%(cntxcom) %(extraopts) %(execopts)%t" TeX-run-TeX nil
		     (context-mode) :help "Run ConTeXt until completion")
		    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode
		      context-mode)
		     :help "Run BibTeX")
		    ("Biber" "biber %s" TeX-run-Biber nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Run Biber")
		    ("View" "%V" TeX-run-discard-or-function t t :help "Run Viewer")
		    ("Print" "%p" TeX-run-command t t :help "Print the file")
		    ("Queue" "%q" TeX-run-background nil t :help "View the printer queue"
		     :visible TeX-queue-command)
		    ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Generate PostScript file")
		    ("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Convert DVI file to PostScript")
		    ("Dvipdfmx" "dvipdfmx %d" TeX-run-dvipdfmx nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Convert DVI file to PDF with dvipdfmx")
		    ("Ps2pdf" "ps2pdf %f" TeX-run-ps2pdf nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Convert PostScript file to PDF")
		    ("Glossaries" "makeglossaries %s" TeX-run-command nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Run makeglossaries to create glossary\n     file")
		    ("Index" "makeindex %s" TeX-run-index nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Run makeindex to create index file")
		    ("upMendex" "upmendex %s" TeX-run-index t
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Run upmendex to create index file")
		    ("Xindy" "texindy %s" TeX-run-command nil
		     (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
		     "Run xindy to create index file")
		    ("Check" "lacheck %s" TeX-run-compile nil (latex-mode) :help
		     "Check LaTeX file for correctness")
		    ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (latex-mode) :help
		     "Check LaTeX file for common mistakes")
		    ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil t :help
		     "Spell-check the document")
		    ("Clean" "TeX-clean" TeX-run-function nil t :help
		     "Delete generated intermediate files")
		    ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help
		     "Delete generated intermediate and output files")
		    ("Other" "" TeX-run-command t t :help "Run an arbitrary command"))
 )