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Re: Adding keywords for font-lock experts

From: Sébastien Vauban
Subject: Re: Adding keywords for font-lock experts
Date: Thu, 12 Mar 2009 11:14:42 +0100
User-agent: Gnus/5.110009 (No Gnus v0.9) Emacs/23.0.60 (gnu/linux)


> My goal is to highlight some words [like `Warning'] in (almost) all modes.
> To do such a thing, I've found on the Web [...] different solutions.
>   (font-lock-add-keywords nil
>    `(("\\(BUGS\\|FIXME\\|Firefox\\|TODO\\|Warning\\|WARNING\\)"
>      1 'font-lock-warning-face prepend))))
>   [...]
>   (font-lock-add-keywords mode
>     `((,pattern
>       1 'special-words prepend))))
> They almost behave the same from a user perspective, but is one of them
> superior to the others from a technical perspective (better coding regarding
> different versions of Emacs, portability, etc.)?

I've found good documentation
explaining the differences between the exposed solutions:

    o   one is to add fontification patterns for _one major mode only_;

    o   the other affects _all derived modes_ as well.

I've now rewritten the codes as follows:

--8<---------------cut here---------------start------------->8---
;; special words
(setq keywords-level-1-pattern "\\(BUGS\\|FIXME\\|TODO\\)")
(make-face 'keywords-level-1)
(set-face-attribute 'keywords-level-1 nil :foreground "red")

(setq keywords-level-2-pattern "\\(WARNING\\)")
(make-face 'keywords-level-2)
(set-face-attribute 'keywords-level-2 nil :foreground "purple")

;; set up highlighting of special words for proper selected major modes only
(dolist (mode '(fundamental-mode
                text-mode))  ; no interference with org-mode (which derives
                             ; from text-mode)
  (font-lock-add-keywords mode
    `((,keywords-level-1-pattern 1 'keywords-level-1 prepend)
      (,keywords-level-2-pattern 1 'keywords-level-2 prepend))))
--8<---------------cut here---------------end--------------->8---


    o   it still does not work with _LaTeX logs_ (generated on the fly in
        buffers that are *not* associated with a file), such as `*test output'
        -- whose major mode is `fundamental-mode';

    o   it still does not work with Gnus (for messages that I'm _reading_ as
        well as for messages that I'm _composing_).

Can some expert please help me on this? I'm now totally blocked at this

Best regards,

Sébastien Vauban

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