GNU bug report logs - #635
Adding font-lock keywords results in no font-lock at all

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#635: closed (Adding font-lock keywords results in no
 font-lock at all)
Date: Sat, 09 Oct 2010 04:09:02 +0000

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Your message dated Sat, 09 Oct 2010 00:11:29 -0400
with message-id <878w28j98u.fsf <at> stupidchicken.com>
and subject line Re: bug#635: Adding font-lock keywords results in no font-lock at all
has caused the GNU bug report #635,
regarding Adding font-lock keywords results in no font-lock at all
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
635: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=635
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Contact help-debbugs <at> gnu.org with problems

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From: Klaus Zeitler <kzeitler <at> alcatel-lucent.com>
To: bug-gnu-emacs <at> gnu.org
Cc: Klaus Zeitler <kzeitler <at> alcatel-lucent.com>
Subject: Adding font-lock keywords results in no font-lock at all
Date: Fri, 1 Aug 2008 08:21:30 +0200 (MEST)

For many years I had the following statement in my .emacs file:

(defun show-tabs () "Show tabs with a slightly changed background"
  (font-lock-add-keywords nil '(("\t"  (0 'tab-face t))) t))
(add-hook 'font-lock-mode-hook 'show-tabs)

This has worked without any problems up to 22.1.
In version 22.2 and 23 I do have problems with syntax highlighting due
to these few lines above in some modes, e.g. when I try M-x list-faces-display
all colors are gone.

To reproduce:

1. start "emacs -Q"
2. in scratch buffer evaluate
(defun show-tabs () "Show tabs with a slightly changed background"
  (font-lock-add-keywords nil '(("\t"  (0 'font-lock-constant-face t))) t))
(add-hook 'font-lock-mode-hook 'show-tabs)
3. M-x list-faces-display
=> everything's displayed in default face



In GNU Emacs 22.2.2 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2008-04-09 on sfsws4
Windowing system distributor `Sun Microsystems, Inc.', version 11.0.6410
configured using `configure  '--with-gcc' '--prefix=/vol/freeware/SunOS-5.8/emacs/22.2' '--sharedstatedir=/vol/freeware/SunOS-5.8/emacs/22.2/share' '--with-x-toolkit=motif' '--x-includes=/usr/openwin/include:/usr/local/gnu/include:/opt/exp/gnu/include:/opt/exp/include:/opt/exp/lib/xpm/include' '--x-libraries=/usr/openwin/lib:/usr/local/gnu/lib:/opt/exp/gnu/lib:/opt/exp/lib:/opt/exp/lib/xpm/lib' '--with-pop' 'CC=gcc' 'XMKMF=/usr/openwin/bin/xmkmf''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
("emacs" "-Q")
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading emacsbug...
Loading regexp-opt...done
Loading emacsbug...done

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: 635-done <at> debbugs.gnu.org
Subject: Re: bug#635: Adding font-lock keywords results in no font-lock at all
Date: Sat, 09 Oct 2010 00:11:29 -0400

I've just checked in a patch by David Koppelman which should fix this:

http://lists.gnu.org/archive/html/emacs-devel/2010-10/msg00239.html

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