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[O] Font-lock-add-keywords disables Org headline highlighting


From: Sebastien Vauban
Subject: [O] Font-lock-add-keywords disables Org headline highlighting
Date: Wed, 21 Nov 2012 09:40:05 +0100
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2.50 (windows-nt)

Hello,

With the following code, I can highlight special words such as `error' and
`warning' in any part of a buffer.

--8<---------------cut here---------------start------------->8---
(message "Minimal Emacs config file...")

(defface org-todo
  '((t (:weight bold :box (:line-width 1 :color "#89C58F")
                :foreground "#89C58F" :background "#E2FEDE")))
  "Face used to display state TODO.")

(defface org-level-1
  '((t (:weight bold :box (:line-width 1 :color "#42B5FF")
                :foreground "#42B5FF" :background "#D3EEFF")))
  "Outline level 1.")

(defface my/highlight-face
  '((t (:weight normal :slant normal :box '(:line-width 1 :color "#CC0000")
                :foreground "#CC0000" :background "#FFFF88")))
  "Face for making FIXME and other warnings stand out.")

(defvar my/highlight-org-regexps
  "\\(FIXME\\|BUG\\|XXX\\|[Ee]rror\\|[Ww]arning\\|WARNING\\)"
  "Patterns to highlight (for Org mode only, to ensure no conflict with the
  Org mode TODO keyword).")

;; set up highlighting of special patterns for Org mode only
(dolist (mode '(org-mode))
  (font-lock-add-keywords mode
                          `((,my/highlight-org-regexps 1 'my/highlight-face 
prepend))))

(message "Minimal Emacs config file... Done")
--8<---------------cut here---------------end--------------->8---

However, as you can see on the screencast at
http://screencast.com/t/RfMrD1IUBPZ, that conflicts with normal regular
highlighting of headlines.

In this MCE ("Minimal Complete Example"):

--8<---------------cut here---------------start------------->8---
* TODO Fix the warning about that

Bar is wrong.

* TODO Correct this

There is an error when you compile foo.
--8<---------------cut here---------------end--------------->8---

the first headline is not highlighted anymore (in `org-level-1') as soon as we
type one of the font-lock keywords (here: `warning').

Can you give me hints to sort this out?

Best regards,
  Seb

-- 
Sebastien Vauban




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