From: Nikolaj Schumacher <me@nschum.de>
To: Andreas Politz <politza@fh-trier.de>
Cc: help-gnu-emacs@gnu.org
Subject: Re: save-current-buffer
Date: Sun, 19 Oct 2008 17:44:01 +0200 [thread overview]
Message-ID: <m21vycbnem.fsf@nschum.de> (raw)
In-Reply-To: <1224362986.875430@arno.fh-trier.de> (Andreas Politz's message of "Sat\, 18 Oct 2008 22\:43\:58 +0200")
Andreas Politz <politza@fh-trier.de> wrote:
> Is this a bug, or am I missing something ?
> Eval this in *scratch* buffer and you end up in the *Help* one.
>
> (save-current-buffer
> (switch-to-buffer "*Help*"))
There is a subtle difference between the current-buffer and the window's
buffer. Any buffer can be current without being displayed. The
function for that is `set-buffer'.
`switch-to-buffer' changes both the current-buffer and the selected window's
buffer.
(progn
(message "%s/%s" (current-buffer) (window-buffer (selected-window)))
(save-current-buffer
(switch-to-buffer "*Help*")
(message "%s/%s" (current-buffer) (window-buffer (selected-window))))
(message "%s/%s" (current-buffer) (window-buffer (selected-window))))
will output:
*scratch*/*scratch*
*Help*/*Help*
*scratch*/*Help*
As you can see, current-buffer is restored, but the window's
buffer is not.
Replacing `save-current-buffer' with `save-window-excursion'
gets you:
*scratch*/*scratch*
*Help*/*Help*
*scratch*/*scratch*
But generally, `switch-to-buffer' should only be used when the user
wants to see the new buffer. Otherwise `set-buffer' is the better choice.
regards,
Nikolaj Schumacher
next prev parent reply other threads:[~2008-10-19 15:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-18 20:43 save-current-buffer Andreas Politz
2008-10-18 23:12 ` save-current-buffer B. T. Raven
2008-10-19 2:57 ` save-current-buffer Chris F.A. Johnson
2008-10-20 0:37 ` save-current-buffer B. T. Raven
2008-10-19 7:24 ` save-current-buffer Glauber Alex Dias Prado
[not found] ` <mailman.1486.1224401134.25473.help-gnu-emacs@gnu.org>
2008-10-19 10:31 ` save-current-buffer Andreas Politz
2008-10-19 15:44 ` Nikolaj Schumacher [this message]
[not found] ` <mailman.1511.1224431046.25473.help-gnu-emacs@gnu.org>
2008-10-21 11:26 ` save-current-buffer Andreas Politz
2008-10-21 21:21 ` save-current-buffer Nikolaj Schumacher
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