Re: unfortunate "feature interaction" of org-export and emacs-latex-auctex mode

[Nick Dokos <ndokos@gmail.com>]

Marcin Borkowski <mbork@mbork.pl> writes:

> On 2015-11-09, at 19:54, Martin Steffen <msteffen@ifi.uio.no> wrote:
>
>> Hi,
>>
>> Perhaps it's not really a "fault" of org (nor of auctex), but both
>> things interact unfortunate. 
>>
>> The reason is: when I export org to LaTeX, and I visit the latex file
>> afterwards, I want that auctex/emacs is instructed about some facts. Thus I
>> like to have some lines such as
>>
>> %%% Local Variables: 
>> %%% mode: latex
>> %%% TeX-master: t
>> %%% End: 
>>
>> at the end of the latex file. Org allows that, in that I add the
>> "LATEX-only" export at the end of the org-file
>>
>> #+BEGIN_LATEX
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>> %%% Local Variables: 
>> %%% mode: latex
>> %%% TeX-master: t
>> %%% End: 
>> #+END_LATEX
>>
>>
>> Doing that produces the desired lines at the end of the generated latex, and
>> if I visit the latex file, emacs/auctex is instructed according to my wishes.
>>
>>
>> Now the problem: If I refresh the /org/ file, emacs/org thinks that actually
>> the file is a latex file (due to the line "mode: latex") and switches from
>> org-mode to latex-mode.
>>
>>
>> It's a minor thing, obviously, but I just wonder if there's an easy workaround.
>
> Note: this is a terrible hack, so use it your own risk, only if there's
> no sane alternative etc.
>
> #+BEGIN_COMMENT
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> %%% Local Variables: 
> %%% mode: org
> %%% End: 
> #+END_COMMENT
> #+BEGIN_LATEX
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> %%% Local Variables: 
> %%% mode: latex
> %%% TeX-master: t
> %%% End: 
> #+END_LATEX
>

Is there some rule about what happens when emacs sees two local variable
blocks in a file? It seems that the first one is enforced and the second
ignored: the above works in the given order of the two blocks, but not
if the order is reversed.

In any case, another solution along the same lines is as follows:
local variables are only recognized in the last "page" of the file so
just add a Control-L at the end of the org file:

--8<---------------cut here---------------start------------->8---
...
#+BEGIN_COMMENT
Insert a control-L here to prevent emacs from interpreting the local
variables block above - local variables blocks are recognized only on
the last "page" of the file.
\f
#+END_COMMENT
--8<---------------cut here---------------end--------------->8---

--
Nick