Re: Bad moves with xref-find-definitions

[Dmitry Gutov <dgutov@yandex.ru>]

On 04/25/2015 09:56 PM, joaotavora@gmail.com (João Távora) wrote:

> While we're on the subject, is a patch welcome to set
> `xref-find-function' to `elisp-xref-find' more pervasively in the
> apropos, debugger and help buffers?

I'm fine with that, but the effect will also make it harder for Eli to 
undo that change. :) Dunno how important that is.

See http://debbugs.gnu.org/19466.

> The patch attached does this to a certain degree, but takes some care to
> not do this is the major mode's definitions, since in theory these modes
> could be used for something other than emacs-lisp.

Makes sense.

> On the other hand, should we care? Currently, M-. in the *Help* buffer
> always prompts to find a tag, which is less useful (if not useless) than
> having it try to navigate to an elisp symbol definition.

If you run 'make tags', it'll create lisp/TAGS linked with src/TAGS, the 
former containing the core Lisp definitions. Though not any third-party 
ones.

> diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
> index ce5c786..7585215 100644
> --- a/lisp/emacs-lisp/debug.el
> +++ b/lisp/emacs-lisp/debug.el
> @@ -338,7 +338,8 @@ That buffer should be current already."
>   			(with-current-buffer (car tem)
>   			  (point))))
>   	(pop tem))))
> -  (debugger-make-xrefs))
> +  (debugger-make-xrefs)
> +  (setq-local xref-find-function #'elisp-xref-find))

Both this and the other places should probably set 
xref-identifier-completion-table-function as well. You could extract 
those three lines from emacs-lisp-mode.

> +(advice-add 'describe-mode :after #'help--setup-xref-find-function)
> +(advice-add 'describe-function :after #'help--setup-xref-find-function)
> +(advice-add 'describe-variable :after #'help--setup-xref-find-function)
> +(advice-add 'describe-bindings :after #'help--setup-xref-find-function)

Why not add the call to the command definitions directly?