Hi Greg,

Greg Bognar via General discussion about AUCTeX <[email protected]> writes:

> I would like to apply my own font-locking to footnotes in my
> documents.  I want the footnote text to be smaller and set in a dimmer
> color to make it less obtrusive.
>
> I first defined a new face:
>
>   (defface my-font-latex-footnote-face
>     '((t :foreground "MistyRose4" :height 0.9))
>     "Face used for footnotes."
>     :group 'font-latex-highlighting-faces)
>
> Then I set `font-latex-user-keyword-classes':
>
>   (setq font-latex-user-keyword-classes
>    '(("my-footnote" (("footnote" "{")) 'my-font-latex-footnote-face command)))
>
> Then I restarted Emacs.
>
> Interestingly, the footnote text is now shown in a smaller font (so
> :height 0.9 works), but not in the new foreground color.  It is still
> fontified with `font-lock-constant-face'.
>
> In `font-latex.el' there is the customizable variable
> `font-latex-deactivated-keyword-classes'.  But I don't want to
> deactivate the whole `reference' class, only change the face used for
> the footnote text.  How can I achieve that?

The way I see it you have to remove AUCTeX fontification for "footnote"
before adding your own rule.  Overall, something like this seems to work
in my brief testing:

--8<---------------cut here---------------start------------->8---
(defface my-font-latex-footnote-face
  '((t :foreground "DarkOliveGreen4" :height 0.9))
  "Face used for footnotes."
  :group 'font-latex-highlighting-faces)

(setq font-latex-user-keyword-classes
      '(("my-footnote" (("footnote" "{"))
         my-font-latex-footnote-face command)))
;;      ^ Quote removed

;; Added as described in AUCTeX manual:
(with-eval-after-load 'font-latex
  (setq-default
   font-latex-match-reference-keywords-local
   (remove (assoc-string "footnote"
                         font-latex-match-reference-keywords-local)
           font-latex-match-reference-keywords-local)))
--8<---------------cut here---------------end--------------->8---

I also removed a ' in the (setq font-latex-user-keyword-classes form, I
think it is not needed.  Do you want to try the above at your end?

Best, Arash

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