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From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Subversion of user chosen major mode by Emacs.
Date: Wed, 29 May 2024 13:29:34 +0000	[thread overview]
Message-ID: <ZlctviiEVl8j9FzV@ACM> (raw)
In-Reply-To: <86y17sssc6.fsf@gnu.org>

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 <eliz@gnu.org>, emacs-devel@gnu.org
> > From: Alan Mackenzie <acm@muc.de>

> > 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).



  reply	other threads:[~2024-05-29 13:29 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-28 10:53 My usage of imenu is broken Alan Mackenzie
2024-05-28 11:34 ` Eli Zaretskii
2024-05-28 13:57   ` Alan Mackenzie
2024-05-28 18:29     ` Eli Zaretskii
2024-05-28 20:46       ` Alan Mackenzie
2024-05-28 21:28         ` Stefan Monnier
2024-05-29  6:04           ` Juri Linkov
2024-05-29 11:31         ` Eli Zaretskii
2024-05-29  5:38       ` Yuan Fu
2024-05-28 21:55     ` Stefan Monnier
2024-05-29 11:16       ` Subversion of user chosen major mode by Emacs. [Was: My usage of imenu is broken.] Alan Mackenzie
2024-05-29 11:43         ` Dmitry Gutov
2024-05-29 12:51           ` Subversion of user chosen major mode by Emacs Alan Mackenzie
2024-05-29 16:08             ` Dmitry Gutov
2024-05-29 16:38               ` Eli Zaretskii
2024-05-29 17:56                 ` Dmitry Gutov
2024-05-29 19:22               ` Alan Mackenzie
2024-05-29 19:45                 ` Andrea Corallo
2024-05-29 19:59                   ` Alan Mackenzie
2024-05-30  5:01                     ` Eli Zaretskii
2024-05-30 11:02                       ` Alan Mackenzie
2024-05-29 22:10                 ` Dmitry Gutov
2024-05-30  5:51                   ` Eli Zaretskii
2024-05-30  5:44                 ` Eli Zaretskii
2024-05-29 12:41         ` Subversion of user chosen major mode by Emacs. [Was: My usage of imenu is broken.] Eli Zaretskii
2024-05-29 13:29           ` Alan Mackenzie [this message]
2024-05-29 14:20             ` Subversion of user chosen major mode by Emacs Eli Zaretskii
2024-05-29 15:04               ` Stefan Monnier
2024-05-29 19:17         ` Subversion of user chosen major mode by Emacs. [Was: My usage of imenu is broken.] Eli Zaretskii
2024-05-30  1:32         ` Stefan Monnier
2024-05-30  5:25           ` Eli Zaretskii
2024-05-30  7:39             ` Po Lu
2024-05-30  7:53               ` Eli Zaretskii
2024-05-30 14:18             ` Stefan Monnier
2024-05-30 14:33               ` Po Lu
2024-05-30 15:08                 ` Stefan Monnier
2024-05-30 14:56               ` Eli Zaretskii
2024-05-30 15:12                 ` Stefan Monnier
2024-05-30 15:29                   ` Alan Mackenzie
2024-05-30 18:30                     ` Stefan Monnier
2024-05-30 16:06                   ` Eli Zaretskii

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