From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: mixing argument types Date: Mon, 27 Aug 2018 22:07:24 +0200 Organization: Aioe.org NNTP Server Message-ID: <86y3crk1z7.fsf@zoho.com> References: <86tvnhktf7.fsf@zoho.com> <86pny4ly4p.fsf@zoho.com> <86lg8slxsd.fsf_-_@zoho.com> <86d0u4ltrl.fsf@zoho.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1535400516 31288 195.159.176.226 (27 Aug 2018 20:08:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 27 Aug 2018 20:08:36 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Aug 27 22:08:32 2018 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fuNoO-00084V-04 for geh-help-gnu-emacs@m.gmane.org; Mon, 27 Aug 2018 22:08:32 +0200 Original-Received: from localhost ([::1]:34966 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fuNqU-0007SN-9w for geh-help-gnu-emacs@m.gmane.org; Mon, 27 Aug 2018 16:10:42 -0400 Original-Path: usenet.stanford.edu!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 32 Original-NNTP-Posting-Host: onLrbz09yV+MU3RaxdbMkg.user.gioia.aioe.org Original-X-Complaints-To: abuse@aioe.org Cancel-Lock: sha1:BGuGDsgKm+Xi+rq2dqYyDqIOd9I= Mail-Copies-To: never X-Notice: Filtered by postfilter v. 0.8.3 Original-Xref: usenet.stanford.edu gnu.emacs.help:223653 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.help:117778 Archived-At: Rodolfo Medina wrote: > And region-beginning/end...? You can set the mark with C-SPC (`set-mark-command'), and then move point (the cursor) around with the usual keys. You should now see the effect of this in the buffer. The area covered is called the region. Often, functions operate on this region because it is a natural way to specify what part of the buffer should be affected by a command: first the user sets the region, then the command is invoked, and because there is a region, the command affects that, rather than the whole buffer (or something else, depending on the command). In Elisp code, you can find out if there is a region with (use-region-p). You can even, right now reading this, evaluate that (with `C-x C-e', `eval-last-sexp') with and without a region: it should evaluate to t or nil accordingly. In the Elisp code, if there is a region you use `region-beginning' and `region-end' to delimit the part of the buffer it covers. -- underground experts united http://user.it.uu.se/~embe8573