From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Operate on each line in region Date: Wed, 23 Apr 2014 14:05:18 -0400 Message-ID: References: <787a28ce-2ab1-4b11-92fd-ca4506447baa@googlegroups.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1398276367 17853 80.91.229.3 (23 Apr 2014 18:06:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 23 Apr 2014 18:06:07 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Apr 23 20:06:00 2014 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 1Wd1YV-0007fv-Kd for geh-help-gnu-emacs@m.gmane.org; Wed, 23 Apr 2014 20:05:59 +0200 Original-Received: from localhost ([::1]:34144 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wd1YV-0000WE-6m for geh-help-gnu-emacs@m.gmane.org; Wed, 23 Apr 2014 14:05:59 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41753) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wd1YC-0000OP-B4 for help-gnu-emacs@gnu.org; Wed, 23 Apr 2014 14:05:47 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Wd1Y4-0004Ea-Nm for help-gnu-emacs@gnu.org; Wed, 23 Apr 2014 14:05:40 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:58369) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wd1Y4-0004EK-9r for help-gnu-emacs@gnu.org; Wed, 23 Apr 2014 14:05:32 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Wd1Y2-0007Cp-PE for help-gnu-emacs@gnu.org; Wed, 23 Apr 2014 20:05:30 +0200 Original-Received: from 76-10-163-148.dsl.teksavvy.com ([76.10.163.148]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 23 Apr 2014 20:05:30 +0200 Original-Received: from monnier by 76-10-163-148.dsl.teksavvy.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 23 Apr 2014 20:05:30 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 76-10-163-148.dsl.teksavvy.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) Cancel-Lock: sha1:fD2tHMyKTr2t+ZZrUHVGVduh4eU= 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:97335 Archived-At: > (defun my-justify (start end) > (interactive 'r') > (while (< (point) end)) > ...body... > (forward-line 1))) Just beware that as you go modify the buffer, the position that you consider as "the end" will move as well. You can solve this problem in a few different ways: - loop from end to start. - make sure `end' is a marker rather than an integer so it will be automatically adjusted to keep pointing to the same logical position in the text. - use narrowing (which uses similar machinery as a marker). I personally recommend against using narrowing, unless it's *really* much simpler. The reason for it is that narrowing affects "everything", so it's kind of a sledgehammer which can have unintended consequences. > I'm wondering if there is a more straightforward way to accomplish this. Not sure what "more straightforward" would look like. Stefan