Re: Need help with search based font-locking

[Lennart Borgman <lennart.borgman@gmail.com>]

On Tue, Dec 22, 2009 at 10:45 PM, Tassilo Horn <tassilo@member.fsf.org> wrote:
> Hi all,
>
> in my greql-mode [1], I setup font-locking like that:
>
> --8<---------------cut here---------------start------------->8---
> (define-derived-mode greql-mode text-mode "GReQL"
>  "A major mode for GReQL2."
>  [...]
>  (setq font-lock-defaults
>        '((greql-fontlock-keywords-1
>           greql-fontlock-keywords-2
>           greql-fontlock-keywords-3)))
>  (add-hook 'after-save-hook 'greql-set-fontlock-keywords-3 t t)
>  [...]
>  (define-key greql-mode-map (kbd "C-c C-f") 'greql-format))
> --8<---------------cut here---------------end--------------->8---
>
> `greql-fontlock-keywords-3's value is not static, it frequently changes.
> So I update it after saving (as you can see), and at several other
> places.  The updating of the variable works, but how do I tell font-lock
> that it should use the new value and re-fontify the current buffer?
>
> As a brute-force workaround, I can do
>
>   (set (make-local-variable 'font-lock-keywords)
>        greql-fontlock-keywords-3)
>   (redisplay t)
>
> but I guess this is very bad style.  And even then some things that
> should be highlighted are not.  For those, I need to delete a char and
> add it back to apply the new fontification.
>
> I really tried to dig into the elisp manual, but I couldn't find any
> help with font-lock-defaults KEYWORDS that aren't fixed.


Maybe you can use jit-lock-refontify?