Well, it all worked once.  When I closed the latex file and later this
afternoon reopened it in Emacs, it didn't see the key-val labels and auctex
wouldn't enter my theoremlike environments with key-val labels.

I'll make up a small working example and I'll send my .emacs file.

Máté

On Fri, Sep 18, 2020 at 10:56 AM Wierdl Máté <wierdlm...@gmail.com> wrote:

> I think at stackexchange the file you gave was the same.  The possible
> difference hence is the installation of the newer auctex?
>
>
>
> On Fri, Sep 18, 2020 at 10:48 AM Wierdl Máté <wierdlm...@gmail.com> wrote:
>
>> Arash,
>>
>> This is fantastic.  I installed the new auctex via elpa and your style
>> file, and now when I enter a tcolorbox environment, I get the keyval labels
>> added automatically.  I also see the references when I do C-c ).
>>
>> I'll report back if I see any bugs but I am happy!
>>
>> The answer you gave me a while back in stack exchange was only partially
>> working, but now this is all good. Maybe you want to update there?
>>
>>
>> https://tex.stackexchange.com/questions/463855/auctex-reftex-how-do-i-handle-labels-that-use-label-name-syntax-instead-of
>>
>> Thx,  bro,
>>
>> Máté
>>
>> On Fri, Sep 18, 2020 at 5:17 AM Arash Esbati <ar...@gnu.org> wrote:
>>
>>> Hi Máté,
>>>
>>> Wierdl Máté <wierdlm...@gmail.com> writes:
>>>
>>> > I am using the tcolorbox latex package which doesn't use the usual
>>> '\label'
>>> > command.  Instead, one has to specify a label  in key-val form as in
>>> >
>>> > \begin{thm}[label={thm:1}]{}{}
>>> >   $1=2/2$
>>> > \end{thm}
>>> >
>>> > Is there a way to have reftex/auctex work with this variation?
>>>
>>> AUCTeX/RefTeX were designed for vanilla LaTeX.  Additional packages are
>>> supported via style files (within AUCTeX) and customization in RefTeX.
>>> key-val labels are possible, but with some limitations (see below).
>>>
>>> > What I mean is this
>>> >
>>> > 1) reftex keeps track of these as labels and  when I want to reference
>>> this
>>> > theorem, 'C-c )' will show this to me.
>>>
>>> You can add your environment to `reftex-label-regexps' in order to tell
>>> RefTeX about `thm'.  But the regexp is somewhat complicated.
>>>
>>> > (Until today, this was working fine, but now reftex doesn't recognize
>>> > this form of a label.  I have no idea what happened, what's changed. )
>>>
>>> Which version of Emacs are you using?  Have you updated to 27.1?
>>> RefTeX's handling of key-val labels was changed there.
>>>
>>> > 2) auctex/reftex enters a label in this key-val form when I do 'C-c ('.
>>>
>>> You can teach AUCTeX to insert a key-val label when you insert the
>>> environment with `C-c C-e ENV RET'; hitting `C-c (' in an environment
>>> doesn't work.
>>>
>>> > 3) the "renumber simple labels" function works with such references.
>>>
>>> This is indeed a missing feature in RefTeX.  I never really looked how
>>> RefTeX does this, hence I can't help.
>>>
>>> Long time ago, I started writing a support file for tcolorbox's theorems
>>> library.  That unfinished work is attached.  Set the variable
>>> `TeX-style-private' to a directory of your choice, e.g.:
>>>
>>>     (setq TeX-style-private
>>>           (expand-file-name "~/.emacs.d/auctex-style"))
>>>
>>> save the file there and open your .tex file.  Also hit `C-c C-n' to
>>> parse your document.  Maybe you can report back if it works.
>>>
>>> Best, Arash
>>>
>>

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