Re: spaces in labels

[Arash Esbati]

Sigurd Angenent <sigurdangenent@gmail.com> writes:

> A while ago coauthors of mine discovered that LaTeX actually allows
> spaces in labels and since then they have gotten addicted to this
> feature.
>
> Reftex has a function (reftex-view-crossref) that searches for the
> defining \label{bla bla bla} statement from any \ref{bla bla bla} or
> \eqref{bla bla bla} statement.  This is very useful except it doesn't
> work with labels that have spaces.
>
> On my computer I looked in the file reftex-dcr.el and deleted the
> space from the string on line 56 in the statement
>
>  (key (reftex-this-word "^{}%\n\r,\t"))

Interestingly, a SPACE was added to the regexp with this patch[1].

> I saved and byte compiled the file and it now seems to work on labels
> with spaces for me.  I don't know how many other problems I have
> created by doing this, but I will find out, I guess.

That would be indeed interesting to find out.

> Since these files were located in /usr/share/emacs/29.4/lisp/textmodes
> I had to sudo a fair amount of things, which made me uncomfortable.
> There ought to be a way to do this in my .emacs file.

You can use the advise facility provided by Emacs: In your init file,
you first define your own version of `reftex-view-crossref' like this:

(defun my/reftex-view-crossref (&optional arg auto-how fail-quietly)
  "View cross reference of macro at point."

  (interactive "P")
  ;; See where we are.
  (let* ((macro (car (reftex-what-macro-safe 1)))
         (key (reftex-this-word "^{}%\n\r,\t"))
         dw)
    ...
)

And then replace the original function like this:

(advice-add 'reftex-view-crossref :override #'my/reftex-view-crossref)

HTH.

Best, Arash

Footnotes:
[1]  
https://git.savannah.gnu.org/cgit/emacs.git/commit/lisp/textmodes/reftex-dcr.el?id=4e33ebe07342950759abe58c2a1828b1d66100e7