From: Nikolaj Schumacher <me@nschum.de>
To: Matt Price <matt.price@utoronto.ca>
Cc: help-gnu-emacs@gnu.org
Subject: Re: check to see if a buffer with a certain name exists?
Date: Thu, 13 Nov 2008 20:50:14 +0100 [thread overview]
Message-ID: <m21vxfjthl.fsf@nschum.de> (raw)
In-Reply-To: <1226590775.8767.2137.camel@localhost> (Matt Price's message of "Thu\, 13 Nov 2008 10\:39\:35 -0500")
Matt Price <matt.price@utoronto.ca> wrote:
> in lisp i'm not seeing a quick way to test for something like this.
> best i can see right now is to use dolist thus:
>
> (dolist (name (buffer-list) foundit)
> (let ((foundit 0))
> (if (string-match "*scratch*" name)
> (setq foundit 1))
> )
> )
Drew already gave you the cleaner way. Let me also tell you, why yours
is not working.
First, you bind foundit inside the `dolist' body. The value is lost when
the `let' block exits, and the variable is undefined.
Second, `buffer-list' returns buffer "objects", not strings.
Here's how it would work:
(let ((foundit 0))
(dolist (name (buffer-list) foundit)
(if (string-match "*scratch*" (buffer-name name))
(setq foundit 1))))
Or the Awesome Lisp Way(TM):
(member "*scratch*" (mapcar 'buffer-name (buffer-list)))
regards,
Nikolaj Schumacher
next prev parent reply other threads:[~2008-11-13 19:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-13 15:39 check to see if a buffer with a certain name exists? Matt Price
2008-11-13 16:45 ` Drew Adams
2008-11-14 15:35 ` Matt Price
2008-11-13 19:50 ` Nikolaj Schumacher [this message]
2008-11-13 21:03 ` Ian Eure
2008-11-14 15:38 ` Matt Price
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