From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: set-buffer-major-mode: how to use on buffer without file? Date: Thu, 25 Mar 2021 10:26:04 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="22419"; 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:RBpSK3d64TbJf5/3DMcN+pzybmg= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Mar 25 15:30:57 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 1lPR0j-0005kk-5D for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 25 Mar 2021 15:30:57 +0100 Original-Received: from localhost ([::1]:55458 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lPR0i-0003yw-5W for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 25 Mar 2021 10:30:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPQzu-0003yB-9N for help-gnu-emacs@gnu.org; Thu, 25 Mar 2021 10:30:06 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:41654) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lPQzs-0001hz-Oe for help-gnu-emacs@gnu.org; Thu, 25 Mar 2021 10:30:06 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lPQzq-0004ie-BL for help-gnu-emacs@gnu.org; Thu, 25 Mar 2021 15:30:02 +0100 X-Injected-Via-Gmane: http://gmane.org/ 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, 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:128560 Archived-At: > I would like to set major mode for the buffer which only displays a > revision in a buffer without associated file. Your use of "the buffer" above is hilarious: it makes it sound like we all should know, as a matter of course, which buffer it is you're talking about, like if it had been on the front page of the newspaper or something. > The buffer name may end with let us say .scm for scheme or .org for > Org mode, I would like to invoke the major mode based on the > file extension. You may want to do: `C-h o C-x v ~` and then look at the implementation of that command (since that command does something closely related to what you describe). Stefan