Re: Introducing face in comments for various modes

[Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

BTW, there is a related convention in ELisp code where comments that
start in column 0 and which are introduced with 3 or more semi-colons
are considered sectioning headers (where ";;;" means a top-level
header, ";;;;" a subheader, ";;;;;" a subsubheader, ...).

I'd be happy if Emacs were changed to highlighting those.


        Stefan


Heime [2022-12-11 15:35:41] wrote:

> The following uses `hi-lock` to change the foreground of comments matching
> a regexp.  This is implemented for emacs-lisp files where comments start 
> with ";;".  
>
> I would like to extend this for other programming languages besides emacs-lisp
> files, using the relevant comment character automatically for that language.
>
> (defface elfa-face
>   '((t :foreground "magenta"))
>   "Face for comment headings.")
>
> (defun elfa-regexp (&optional actm)
>   "Identify comment category ';; [Category]'."
>    (highlight-regexp
>       "^;;\s+\\[.+\\].*$" 'elfa-face))
>
> (defun elfa-category ()
>   "TODO."
>   (interactive)
>   (add-to-list 'auto-mode-alist '("\\.el\\'" . hi-lock-mode))
>   (add-hook 'emacs-lisp-mode-hook 'hi-lock-mode t)
>   (add-hook 'hi-lock-mode-hook 'elfa-regexp))