From: Lars Ingebrigtsen <larsi@gnus.org>
To: Philipp <p.stephani2@gmail.com>
Cc: 48584@debbugs.gnu.org
Subject: bug#48584: 28.0.50; Incorrect hook ordering between local and global hooks with depth
Date: Sun, 06 Jun 2021 11:12:24 +0200 [thread overview]
Message-ID: <87o8cjuzk7.fsf@gnus.org> (raw)
In-Reply-To: <C96E2815-FF0A-4E7C-80ED-4A74FBECF6FC@gmail.com> (Philipp's message of "Fri, 4 Jun 2021 15:20:34 +0200")
Philipp <p.stephani2@gmail.com> writes:
>> If I'm reading run_hook_with_args correctly, it'll loop over the local
>> hook first (in order), and when it happens upon a t in that value, it'll
>> then loop over the global value (in order), and then finish up the rest
>> of the local ones.
>
> Yes - and that's a reasonable behavior to expect, and we should document it.
I think it's an implementation detail that users should not depend on.
Where that `t' ends up being depends on many subtle things like the
order of your add-hook/remove-hook calls in your .emacs file.
> Correct hook ordering is crucial for abnormal hooks. We already rely
> on the very specific ordering behavior several times in the Emacs
> codebase alone. I've searched a bit through the Emacs codebase, and
> found the following places where Emacs runs an abnormal hook with
> `run-hook-with-args-until-success/failure' that also gains a local
> part somewhere the codebase:
[...]
> That is, we rely on this "undefined" behavior already in very basic
> operations such as saving buffers to file. In Eldoc, we even
> explicitly tell users to add functions to the local part of this
> abnormal hook (eldoc-documentation-functions), thereby telling them to
> rely on "undefined" behavior! This hopefully shows that the behavior
> is far from being undefined.
I don't think it shows any such thing.
I think it'd be a good idea to implement (and document) something in
this area that actually allows users to control the hook running order
properly, which currently just isn't possible.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-06-06 9:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-22 11:21 bug#48584: 28.0.50; Incorrect hook ordering between local and global hooks with depth Philipp
2021-05-25 20:07 ` Lars Ingebrigtsen
2021-05-25 20:23 ` Philipp Stephani
2021-05-26 21:50 ` Lars Ingebrigtsen
2021-06-04 13:20 ` Philipp
2021-06-06 9:12 ` Lars Ingebrigtsen [this message]
2021-07-05 18:37 ` Philipp
2021-07-06 13:58 ` Lars Ingebrigtsen
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