From: Kevin Rodgers <kevin.d.rodgers@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: How to detect C-u supplied arguments from other prefix arguments
Date: Tue, 07 Aug 2007 23:06:38 -0600 [thread overview]
Message-ID: <f9bj0l$3cq$1@sea.gmane.org> (raw)
In-Reply-To: <87wsw7hvba.fsf@debby.local.net>
Dieter Wilhelm wrote:
> Hi
>
> I'd like to detect whether prefix arguments of a command are supplied
> by C-u or otherwise.
>
> My idea is to use this-command-keys and compare it to some string,
> like the following pseudo code:
>
> (defun bla (arg)
> (interactive "p")
> (when (string= "C-u" (substring (this-command-keys) 0 2))
> (message "hurray")))
>
> I just don't understand how to compare key sequences. Or maybe
> there's better way of doing it?
Yuck. If all you're concerned about is whether the prefix arg was
specified by 1 or more C-u keys (with no minus sign or digits), you
can use (consp current-prefix-arg).
--
Kevin Rodgers
Denver, Colorado, USA
next prev parent reply other threads:[~2007-08-08 5:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-07 21:46 How to detect C-u supplied arguments from other prefix arguments Dieter Wilhelm
2007-08-08 5:06 ` Kevin Rodgers [this message]
[not found] ` <mailman.4513.1186549602.32220.help-gnu-emacs@gnu.org>
2007-08-08 8:32 ` dieter.wilhelm
[not found] <mailman.4504.1186523154.32220.help-gnu-emacs@gnu.org>
2007-08-08 11:55 ` Johan Bockgård
2007-08-08 12:27 ` dieter.wilhelm
2007-08-09 4:04 ` Barry Margolin
2007-08-09 6:52 ` Dieter Wilhelm
2007-08-09 17:49 ` Stefan Monnier
2007-08-09 20:16 ` Dieter Wilhelm
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