From: Ami Fischman <ami@fischman.org>
To: martin rudalics <rudalics@gmx.at>,
"emacs-devel@gnu.org" <emacs-devel@gnu.org>,
Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: display-buffer vs. current-buffer vs. post-command-hook
Date: Tue, 04 Oct 2016 15:49:14 +0000 [thread overview]
Message-ID: <CAGKqTXUdX1PUQqnphEg3jbZixfRFJEc+i8jG2U7VSjJfJOuaJg@mail.gmail.com> (raw)
In-Reply-To: <CAGKqTXUSk+RjdY0x5s=+n6gaKdLM2WRj6N2Oxw+yB0+FYBDSqA@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1909 bytes --]
Ah, just saw Stefan's reply on the mailing list archive (I'm not subscribed
to emacs-devel anymore). Yes, I think you're right that I was confusing
current-buffer and selected-window.
I'm still a bit curious about the expected semantics of current-buffer, in
particular which built-in commands should I expect to cause c-b to change
asynchronously, in case that's easy to explain.
Cheers,
-a
On Tue, Oct 4, 2016 at 8:45 AM Ami Fischman <ami@fischman.org> wrote:
> ‘describe-key’ is based on ‘with-temp-buffer-window’ which tries very
> hard to restore the current buffer after doing its work. So what you
> see here is not a stale value but one that has been correctly preserved.
>
>
> I'm sorry but I don't understand your statement. Should there not be an
> expectation that (current-buffer)'s return value does not change between
> the second and third call in my original snippet?
> Put another way, under what circumstances should one expect
> current-buffer's return value to be stable in user-written elisp?
> Put a third way, what about describe-keys documentation should lead an
> elisp author to understand that current-buffer will not reflect its effect
> until after a [run-at-time 0]?
> (sorry for the barrage of questions; I feel there's a fundamental
> something I'm missing in play here and trying to see if you know what it is
> :))
>
> Please tell us what you want to accomplish. Then we might be able to
> tell you how to do that.
>
>
> My original goal was to resolve a bug in the interaction between two
> add-on libraries (see the link in my original email). That bug has been
> fixed by replacing the uses of current-buffer with window-buffer so my
> original goal is now moot. Now my goal is to understand the intended
> semantics of interaction between current-buffer and describe-key (and its
> impl).
>
> Cheers,
> -a
>
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next prev parent reply other threads:[~2016-10-04 15:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-04 9:28 display-buffer vs. current-buffer vs. post-command-hook Ami Fischman
2016-10-04 12:00 ` Stefan Monnier
2016-10-04 14:52 ` martin rudalics
2016-10-04 15:45 ` Ami Fischman
2016-10-04 15:49 ` Ami Fischman [this message]
2016-10-04 16:07 ` martin rudalics
2016-10-04 20:03 ` Ami Fischman
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