Re: How to define xref-find-definitions for a new mode?

[Eli Zaretskii <eliz@gnu.org>]

> From: Marcin Borkowski <mbork@mbork.pl>
> Cc: help-gnu-emacs@gnu.org
> Date: Sat, 09 Jun 2018 11:10:22 +0200
> 
> Thanks.  Are there other places I could look into, like xref
> implementation for a concrete language?

In the sources for the respective languages, notably Lisp.  Search for
"xref-".

> > (Btw, doesn't it already work?  Etags is an existing back-end for
> > Xref, and 'etags' the program already supports TeX and its
> > derivatives, so it is able to create TAGS tables for LaTeX files.)
> 
> Well, possibly, but I'd like it to work like for Elisp or JavaScript,
> without a TAGS table.

Is this likely to happen?  Lisp and JavaScript know where to find
functions and variables because they keep that information as part of
defining them.  I don't think TeX does anything similar, does it?

> Also, I want it to go to \label when on \ref, to \bib / \bibitem
> when on \cite etc.

Are you sure it doesn't work already?  E.g., if \label is tagged, then
"M-." on the tag's name at \ref should go to the label's definition.