From: Ami Fischman <ami@fischman.org>
To: martin rudalics <rudalics@gmx.at>,
"emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: display-buffer vs. current-buffer vs. post-command-hook
Date: Tue, 04 Oct 2016 20:03:51 +0000 [thread overview]
Message-ID: <CAGKqTXVuC-M2ZF+hWqZ5j6au0o8HGcGRseB41xjnxCDMpWWBYg@mail.gmail.com> (raw)
In-Reply-To: <57F3D3B6.7080201@gmx.at>
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Thanks Martin! That's exactly the thing I was missing.
https://www.gnu.org/software/emacs/manual/html_node/elisp/Current-Buffer.html#Current-Buffer
On Tue, Oct 4, 2016 at 9:07 AM martin rudalics <rudalics@gmx.at> wrote:
> > 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?
>
> No. The primary concern is that the current buffer must not be changed
> by `describe-key' or any other function that uses a temporary buffer to
> display its results.
>
> > Put another way, under what circumstances should one expect
> > current-buffer's return value to be stable in user-written elisp?
>
> The current buffer should never be changed by any function, unless it is
> a purpose of that function to change the current buffer.
>
> > 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 :))
>
> I suppose you missed the following aspect described in section 26.2 of
> the Elisp manual entitled "The Current Buffer":
>
> When an editing command returns to the editor command loop, Emacs
> automatically calls `set-buffer' on the buffer shown in the selected
> window.
>
> [run-at-time 0] clearly runs after that.
>
> martin
>
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prev parent reply other threads:[~2016-10-04 20:03 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
2016-10-04 16:07 ` martin rudalics
2016-10-04 20:03 ` Ami Fischman [this message]
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