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From: Andreas Politz <politza@fh-trier.de>
To: help-gnu-emacs@gnu.org
Subject: Re: `compare-strings' style question
Date: Thu, 19 Nov 2009 20:55:27 +0100	[thread overview]
Message-ID: <87ws1m70i8.fsf@fh-trier.de> (raw)
In-Reply-To: 20091119152713.GA8204@tomas

tomas@tuxteam.de writes:

> On Thu, Nov 19, 2009 at 12:39:33PM +0100, David Kastrup wrote:
>> tomas@tuxteam.de writes:
>> 
>> > Hi,
>> >
>> > In Elisp, I'm trying to test whether a string is a prefix of another.
>
> [...]
>
>> >   (when (eq (compare-strings foo 0 5 bar 0 5) t)
>> >     ...)
>> >
>> > which looks rather funny. My question: are there better idioms? Am I
>> > barking up the wrong function?
>> 
>> (unless (numberp ...
>> 
>> or
>> 
>> (if (symbolp ...
>
> Thanks. Still looks a bit funna, though :-)
>
> -- tomás

(defun string-prefixp (string prefix &optional ignore-case)
  "Return t if PREFIX is a prefix of STRING."
  (eq t
	(compare-strings string 0 (length prefix)
			 prefix 0 (length prefix)
			 ignore-case)))

I defined this function in one of my elisp files.  Why don't you do just
the same ? Where is the problem.

-ap





  reply	other threads:[~2009-11-19 19:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.11037.1258628274.2239.help-gnu-emacs@gnu.org>
2009-11-19 11:39 ` `compare-strings' style question David Kastrup
2009-11-19 15:27   ` tomas
2009-11-19 19:55     ` Andreas Politz [this message]
2009-11-20  6:47       ` tomas
     [not found]   ` <mailman.11057.1258644880.2239.help-gnu-emacs@gnu.org>
2009-11-19 16:17     ` David Kastrup
2009-11-19 20:54       ` Barry Margolin
2009-11-20  7:00         ` tomas
2009-11-20  8:13           ` Andreas Politz
2009-11-20  6:53       ` tomas
2009-11-19 10:50 tomas
2009-11-20  3:08 ` Kevin Rodgers
2009-11-20  7:03   ` tomas
2009-11-20 10:34     ` Kevin Rodgers
2009-11-24  9:32       ` tomas

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