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: tricky - undo function - planning info Date: Sun, 07 Jun 2015 22:35:18 -0400 Message-ID: References: <27847c65-cbde-47aa-976b-30e2721a3c83@googlegroups.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1433730972 20457 80.91.229.3 (8 Jun 2015 02:36:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 8 Jun 2015 02:36:12 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Jun 08 04:35:58 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 1Z1muq-0005dv-88 for geh-help-gnu-emacs@m.gmane.org; Mon, 08 Jun 2015 04:35:56 +0200 Original-Received: from localhost ([::1]:55695 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1mup-0005ee-2t for geh-help-gnu-emacs@m.gmane.org; Sun, 07 Jun 2015 22:35:55 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41727) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1muW-0005eM-OH for help-gnu-emacs@gnu.org; Sun, 07 Jun 2015 22:35:37 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z1muQ-0001Mu-Le for help-gnu-emacs@gnu.org; Sun, 07 Jun 2015 22:35:36 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:45024) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1muQ-0001M8-F2 for help-gnu-emacs@gnu.org; Sun, 07 Jun 2015 22:35:30 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Z1muL-00056z-3Z for help-gnu-emacs@gnu.org; Mon, 08 Jun 2015 04:35:25 +0200 Original-Received: from 23-91-132-239.cpe.pppoe.ca ([23.91.132.239]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 08 Jun 2015 04:35:25 +0200 Original-Received: from monnier by 23-91-132-239.cpe.pppoe.ca with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 08 Jun 2015 04:35:25 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 20 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 23-91-132-239.cpe.pppoe.ca User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:XA0rElwd7Siya0sWyl2Kn739Ozo= 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:104829 Archived-At: > Normally M-x undo would undo each step. A function may comprise one or more > steps. Emacs doesn't care much about function boundaries. So, if you really mean "function", your needs are clearly out. If you actually meant "command", then at least there's a chance you might get it to do what you want. Still, a command may stop in the middle, calling recusrive-edit and hence calling other sub-commands, at which point it can become far from clear what you mean by "undo 1 command". > Then again, maybe it is already implemented and undocumented, or there > is a simple solution. I doubt it. Maybe all you want is atomic-change-group. But Maybe your needs are very unusual. If you describe them, maybe someone can show you how to do it. Stefan