From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: How to structure looking-at with error conditions
Date: Wed, 24 Nov 2010 08:33:24 -0500 [thread overview]
Message-ID: <barmar-68845F.08332424112010@news.eternal-september.org> (raw)
In-Reply-To: fe88468f-9fac-423b-baac-d39d1bd46f75@z9g2000yqz.googlegroups.com
In article
<fe88468f-9fac-423b-baac-d39d1bd46f75@z9g2000yqz.googlegroups.com>,
Fren Zeee <frenzeee@gmail.com> wrote:
> hello emacs users
>
> generally, i use looking-at as follows
>
> (when (looking-at "desired_pattern")
> ( do_this_and_that
>
> (do some more things)
>
> (when (looking-at "anther_ desired_pattern")
> ( do_this_and_that)
> )
>
> )
>
> whats your expert advice on how to modify if the cursor is not at the
> desired pattern in either case so that an error message is reported ?
>
> should I wrap the looking-at in cond or can I add some kind of default
> ie else like functioning clause to when ?
>
> Franz Xe
Use the more general cond:
(cond ((looking-at "pattern1")
(do-first-stuff))
((looking-at "pattern2")
(do-other-stuff))
(t (error ...)))
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
next parent reply other threads:[~2010-11-24 13:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fe88468f-9fac-423b-baac-d39d1bd46f75@z9g2000yqz.googlegroups.com>
2010-11-24 13:33 ` Barry Margolin [this message]
2010-11-24 17:44 ` How to structure looking-at with error conditions bolega
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