From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Tassilo Horn Newsgroups: gmane.emacs.help Subject: Re: Elisp beginner's question Date: Thu, 18 Sep 2008 16:16:59 +0200 Message-ID: <87k5d91quc.fsf@thinkpad.tsdh.de> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1221747618 22864 80.91.229.12 (18 Sep 2008 14:20:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 18 Sep 2008 14:20:18 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Sep 18 16:21:15 2008 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1KgKNO-0005VU-BI for geh-help-gnu-emacs@m.gmane.org; Thu, 18 Sep 2008 16:20:58 +0200 Original-Received: from localhost ([127.0.0.1]:39950 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KgKMM-0000cc-82 for geh-help-gnu-emacs@m.gmane.org; Thu, 18 Sep 2008 10:19:54 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KgKM0-0000ae-0j for help-gnu-emacs@gnu.org; Thu, 18 Sep 2008 10:19:32 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KgKLw-0000YK-PU for help-gnu-emacs@gnu.org; Thu, 18 Sep 2008 10:19:30 -0400 Original-Received: from [199.232.76.173] (port=54154 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KgKLw-0000Y6-Kj for help-gnu-emacs@gnu.org; Thu, 18 Sep 2008 10:19:28 -0400 Original-Received: from main.gmane.org ([80.91.229.2]:44120 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KgKLw-0004l0-1u for help-gnu-emacs@gnu.org; Thu, 18 Sep 2008 10:19:28 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1KgKLj-00070I-Ip for help-gnu-emacs@gnu.org; Thu, 18 Sep 2008 14:19:15 +0000 Original-Received: from dhcp48.uni-koblenz.de ([141.26.71.48]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 18 Sep 2008 14:19:15 +0000 Original-Received: from tassilo by dhcp48.uni-koblenz.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 18 Sep 2008 14:19:15 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 40 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: dhcp48.uni-koblenz.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) Cancel-Lock: sha1:RDV8QRyvOvdXdjyUtLugzkQ12Ec= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:57761 Archived-At: Uwe Siart writes: Hi Uwe, > ;; -------------------------------------------- > (defun toggle-show-trailing-whitespace () > "Toggle highlighting of trailing whitespace." > (interactive) > (if show-trailing-whitespace > (setq show-trailing-whitespace nil) > (setq show-trailing-whitespace t))) > ;; -------------------------------------------- > > And - well - it works somehow, I don't see any misbehaviour so far. > But I'd appreciate some experts' advice whether this approach is ok or > whether it should be done differently. Your function is ok, but this one is shorter. ;-) --8<---------------cut here---------------start------------->8--- (defun toggle-show-trailing-whitespace () "Toggle highlighting of trailing whitespace." (interactive) (setq show-trailing-whitespace (not show-trailing-whitespace))) --8<---------------cut here---------------end--------------->8--- But I'd say most of the time you want to set this variable on a per-mode basis and not on a per-buffer basis, right? In that case you'd set the variable in the mode's hook like this: --8<---------------cut here---------------start------------->8--- (add-hook 'emacs-lisp-mode-hook (lambda () (setq show-trailing-whitespace))) --8<---------------cut here---------------end--------------->8--- Hope that helps, Tassilo -- Chuck Norris can skeletize a cow in two minutes.