# Auctex command on region - backward search leads to region.tex instead of main.tex

In auctex I can run a command only on a certain region to speed up compiling. This works great, however if then I use the backward search to jump from the .pdf to the .tex source code, it opens the temporary _region_.tex file instead of my real tex file chapter2.tex.

I did search on the internet and in the auctex documentation, but did not find a hint how to set this up correctly.

## Some hints about the configuration

### LaTeX master file with included chapters

I'm using a master file (let's call it main.tex and then include a source file for each chapter with e. g.

\include{chapter2}


### Region.tex file and corresponding log file

My _region_.tex file contains the following line directly after \begin{document)

\message{ !name(chapter2.tex) !offset(927) }


which I think should be used for exactly this purpose.

The _region_.log file contains a line, which refers to the master file, not the chapter:

**\input _region_.tex
(./_region_.tex  !name(main.tex)


### PDF viewer sync settings

In the preferences of Skim.app (the pdf viewer) I'm using the following configuration:

• command: emascsclient
• arguments: --no-wait +%line "%file"

### System and software versions

I'm using MacOS X 10.6 and TeXLive 2014, AUCTeX 11.88.
My pdf viewer is Skim.app and my source editor is Aquamacs.app (Version 3.2)

(I've updated to Aquamacs 3.2 which uses AUCTeX 11.88, but I still have the same problem)

• IIRC, if you use Evince, the current development version of AUCTeX brings back to the original document. – giordano Jan 13 '15 at 10:20
• thanks! How can I determine the installed version of auctex? I'm not using evince, but Skim.app on MacOS X – MostlyHarmless Jan 13 '15 at 10:28
• C-h v AUCTeX-version, but you'd know if you were using the development version of AUCTeX, you'd have compiled it by yourself ;-) – giordano Jan 13 '15 at 10:42
• thanks, no I'm not using the development version, but 11.87. So you mean, this just should not work in v 11.87? You're right, I did not compile it myself in this case, but you would not imagine what I've already done or configured and then forgot about having it done... :-) – MostlyHarmless Jan 13 '15 at 10:45
• The development version is the version after the last stable one (11.88 currently). And I said it works only with Evince, you use Skim instead. Good to see you found a solution anyway. – giordano Mar 11 '15 at 9:44

I finally found a solution for that by configuring emacs (aquamacs):

(defadvice server-goto-line-column (after server-visit-region.tex
(line-col)
activate)
"When visiting _region_.tex from an external
source (e.g. inverse search), go to the original file so that any
(when (string-match "_region_.tex\\'" (buffer-file-name))
(if (save-excursion ;; in case we don't find the other file we at least want the right line...
(re-search-backward
"\message{ !name(\$$[^)]+\$$)\$$?: !offset(\\([-0-9]+\$$)\\)?\\s *}" nil nil))
(let ((file-name (match-string 1))
(offset (match-string 2))