From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: Subversion of user chosen major mode by Emacs. Date: Wed, 29 May 2024 13:29:34 +0000 Message-ID: References: <86r0dmtbk2.fsf@gnu.org> <86y17sssc6.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="25989"; mail-complaints-to="usenet@ciao.gmane.io" Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed May 29 15:30:37 2024 Return-path: Envelope-to: ged-emacs-devel@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 1sCJO0-0006Y0-Od for ged-emacs-devel@m.gmane-mx.org; Wed, 29 May 2024 15:30:36 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sCJN8-0008K2-Vv; Wed, 29 May 2024 09:29:43 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCJN7-0008JW-4L for emacs-devel@gnu.org; Wed, 29 May 2024 09:29:41 -0400 Original-Received: from mail.muc.de ([193.149.48.3]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCJN4-0006mR-RF for emacs-devel@gnu.org; Wed, 29 May 2024 09:29:40 -0400 Original-Received: (qmail 82781 invoked by uid 3782); 29 May 2024 15:29:35 +0200 Original-Received: from muc.de (p4fe15a59.dip0.t-ipconnect.de [79.225.90.89]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Wed, 29 May 2024 15:29:35 +0200 Original-Received: (qmail 11072 invoked by uid 1000); 29 May 2024 13:29:34 -0000 Content-Disposition: inline In-Reply-To: <86y17sssc6.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.3; envelope-from=acm@muc.de; helo=mail.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:319688 Archived-At: Hello, Eli. On Wed, May 29, 2024 at 15:41:45 +0300, Eli Zaretskii wrote: > > Date: Wed, 29 May 2024 11:16:44 +0000 > > Cc: Eli Zaretskii , emacs-devel@gnu.org > > From: Alan Mackenzie > > As I said, when I did M-x revert-buffer yesterday, Emacs changed my > > major mode from C Mode to c-ts-mode. This is clearly unacceptable. > Please show a minimal recipe, starting from "emacs -Q", where > reverting a buffer changes from c-mode to c-ts-mode. With a recent master emacs: (i) emacs -Q (ii) Insert the following into *scratch* and evaluate it: (defun c-make-ts-undefault-mode () "Make the older C and C++ Modes the default major modes for C(++) files." (interactive) (let (c) (dolist (l '(c-ts-mode c++-ts-mode c-or-c++-ts-mode)) (while (setq c (rassq l auto-mode-alist)) (setq auto-mode-alist (remq c auto-mode-alist)))))) (eval-after-load 'c-ts-mode '(c-make-ts-undefault-mode)) (load-library "cc-mode") .. (iii) C-x C-f src/xdisp.c. This is loaded with C Mode. (iv) M-: (load-library "c-ts-mode"). (v) M-x revert-buffer. Emacs reloads the buffer in c-ts-mode. > As a general rule, revert-buffer does not guarantee the major mode > will remain the same, not by default. It calls normal-mode, so if > anything has changed in automatic determination of the mode, you will > get a different mode. This is by design. Such changes to the automatic determination should be as a result of user choices. There shouldn't be nasty surprises in store. -- Alan Mackenzie (Nuremberg, Germany).