From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: How to add syntax-highlighting to a Help buffer? Date: Sat, 04 Jul 2015 01:22:39 +0200 Message-ID: <87si94x1vk.fsf@web.de> References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1435965794 15479 80.91.229.3 (3 Jul 2015 23:23:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 3 Jul 2015 23:23:14 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Jul 04 01:23:06 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZBAIR-0002Eg-Oa for geh-help-gnu-emacs@m.gmane.org; Sat, 04 Jul 2015 01:23:03 +0200 Original-Received: from localhost ([::1]:42817 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZBAIQ-0003nE-Mq for geh-help-gnu-emacs@m.gmane.org; Fri, 03 Jul 2015 19:23:02 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:33324) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZBAIG-0003my-VJ for help-gnu-emacs@gnu.org; Fri, 03 Jul 2015 19:22:53 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZBAID-00072p-PS for help-gnu-emacs@gnu.org; Fri, 03 Jul 2015 19:22:52 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:54324) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZBAID-00072j-Ij for help-gnu-emacs@gnu.org; Fri, 03 Jul 2015 19:22:49 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZBAI9-00024I-QG for help-gnu-emacs@gnu.org; Sat, 04 Jul 2015 01:22:45 +0200 Original-Received: from ip-2-207-250-56.web.vodafone.de ([2.207.250.56]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 04 Jul 2015 01:22:45 +0200 Original-Received: from michael_heerdegen by ip-2-207-250-56.web.vodafone.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 04 Jul 2015 01:22:45 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 24 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip-2-207-250-56.web.vodafone.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:L6KAG9YVpRNhfaeFSZJ1zIwc4O8= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:105415 Archived-At: Raffaele Ricciardi writes: > (font-lock-add-keywords > nil > `(("\\(arbitrary regexp\\)" 1 'font-lock-function-name-face))) > > But the above expression breaks the existing highlighting (the > highlighting of the function arguments disappears). AFAICT you experience a normal "feature" of font-lock-mode. help-mode doesn't use font-lock. It directly attaches face text properties to the buffer text. If font-lock-mode fontifies such a buffer (it doesn't as long as font-lock-keywords is nil even when it is active), all face text properties get ignored by the display engine. Note that there is a font-lock-face text property existing as well. hi-lock works in this case because it handles that case specially and uses overlays. HTH, Michael.