Re: Fundamental mode.

[bojohan+news@dd.chalmers.se (Johan Bockgård)]

I have some questions.

Richard Stallman <rms@gnu.org> writes:

> Lute Kamstra wrote:

>> Modes derived from fundamental mode run after-change-major-mode-hook
>> twice because fundamental mode runs it unconditionally.

I don't understand this. As define-derived-mode is currently defined modes
derived from fundamental-mode do not automatically call the fundamental-mode
function.

[define-derived-mode]

      (when (eq parent 'fundamental-mode) (setq parent nil))
      [...]
      (,(or parent 'kill-all-local-variables))

> Fundamental mode does not run a mode hook because what it means is "put
> settings in their default values". But it needs to run
> after-change-major-mode-hook, since the minor modes that should apply to
> all buffers apply to these buffers too.

Which are "these buffers" that this refers to? A buffer that defaults to
fundamental-mode (as created through C-x C-f on some unknown file type or
through C-x b) does not run the `fundamental-mode' lisp function. Currently
set-buffer-major-mode does not call the major-mode function when the default
mode is fundamental-mode.

[Fset_buffer_major_mode]

      if (NILP (function) || EQ (function, Qfundamental_mode))
        return Qnil;
      [...]
      call0 (function);

-- 
Johan Bockgård