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Re: Hook doesn't run as expected, if buffer mode is set from major-mode
From: |
Rolf Ade |
Subject: |
Re: Hook doesn't run as expected, if buffer mode is set from major-mode |
Date: |
Sat, 09 Jan 2016 01:36:56 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Michael Heerdegen <michael_heerdegen@web.de> writes:
> Rolf Ade <rolf@pointsman.de> writes:
>> Is it me, doing something wrong or stupid? If not, what's the
>> rationale behind this behavior?
>
> Though it's better to set `default-major-mode' and use (goto-char
> (point-max)) instead of `end-of-buffer' (which sets the mark) - it
> should work as you expect. But it doesn't.
Thanks for confirming.
The variable `default-major-mode' was, what I used since ages in my
init.el just to learn this evening, while analyzing this problem, that
this variable is obsolete since 23.2, see C-h v default-major-mode RET.
The documentation of `default-major-mode' points to major-mode. The
behavior is the same, regardless which of the two variables I use.
Also true is your note about (goto-char (point-max)). I tested both with
the same behavior. Picked just 'end-of-buffer to simplify the
reproducing recipe.
Diging further I realize, that what the documentation say explains, what
I see. C-h v major#-mode RET say:
When a mode is used by default, `find-file' switches to it before it
reads the contents into the buffer and before it finishes setting up
the buffer. Thus, the mode and its hooks should not expect [...]
If the mode-hooks run, before the content is read into the buffer it
isn't surprising that (end-of-buffer) doesn't set the point at the end
of the (up to know not read into) content.
But this documentation doesn't tell the truth.
- Prepare a file with a suffix not included in auto-mode-alist (e.g.
test.abc) with some text in it. Create a copy of that file with the
name test.txt
- Start emacs -Q
- In the scratch buffer, evaluate:
(setq-default major-mode 'text-mode)
(add-hook 'text-mode-hook (lambda () (message "End of buffer: %s" (point-max))))
- find-file the above prepared file test.abc
If your file test.abc contains some text, as requested, something other
than 1 is show in the message line. If the content isn't read into the
buffer at the moment, the hook runs, how could it know the (point-max)
of the up to now not known data?
rolf
- Hook doesn't run as expected, if buffer mode is set from major-mode, Rolf Ade, 2016/01/08
- Message not available
- Re: Hook doesn't run as expected, if buffer mode is set from major-mode,
Rolf Ade <=
- RE: Hook doesn't run as expected, if buffer mode is set from major-mode, Drew Adams, 2016/01/08
- Re: Hook doesn't run as expected, if buffer mode is set from major-mode, Michael Heerdegen, 2016/01/08
- Message not available
- Re: Hook doesn't run as expected, if buffer mode is set from major-mode, Rolf Ade, 2016/01/09
- Re: Hook doesn't run as expected, if buffer mode is set from major-mode, Michael Heerdegen, 2016/01/09