From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Is there a way to know if this-command altered the buffer? Date: Wed, 12 May 2021 06:27:25 +0200 Message-ID: <87sg2sa85u.fsf@zoho.eu> References: <87tun8wrqt.fsf@mbork.pl> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3213"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:kO1gKeLgbZwFC/Axppzuh07RvYg= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed May 12 06:27:58 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lggTW-0000hZ-2S for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 12 May 2021 06:27:58 +0200 Original-Received: from localhost ([::1]:52942 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lggTV-0004AU-5K for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 12 May 2021 00:27:57 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51502) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lggTB-0004A6-81 for help-gnu-emacs@gnu.org; Wed, 12 May 2021 00:27:37 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:46408) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lggT9-0002bi-O9 for help-gnu-emacs@gnu.org; Wed, 12 May 2021 00:27:36 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lggT6-0000C0-8D for help-gnu-emacs@gnu.org; Wed, 12 May 2021 06:27:32 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.248, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:129712 Archived-At: Marcin Borkowski wrote: > I want to run some function in a certain hook. This function > will update some info displayed using an overlay. The info > depends on the buffer contents and is pretty expensive to > compute, so I'd like to only display it if the buffer > really changed. > > Is there a way to know if `this-command' actually changed > the buffer (as opposed to e.g. point motion)? Maybe these buffer-chars-modified-tick buffer-modified-tick ? -- underground experts united https://dataswamp.org/~incal