From: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
To: David Kastrup <dak@gnu.org>
Cc: Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Scary undo
Date: Tue, 06 May 2008 19:36:42 +0200 [thread overview]
Message-ID: <4820972A.1030705@gmail.com> (raw)
In-Reply-To: <86abj3zqjw.fsf@lola.quinscape.zz>
David Kastrup wrote:
> "Lennart Borgman (gmail)" <lennart.borgman@gmail.com> writes:
>
>> I would like to undo a change made by a function that I call with
>> funcall. I do not know exactly what the function does, but hopefully
>> it will only indent the current line. However the new indentation
>> might be wrong.
>>
>> The scenario is something like this
>>
>> (funcall the-indentation-function)
>> (when (= 0 (current-indentation))
>> ;; undo what `the-indentation-function' did,
>> ;; but how?
>> )
>>
>> I am a bit scared of writing this undo part so if someone could help
>> me I would be glad. I do not think I can use `undo-boundary' here.
>
> I'd be tempted to do something like
>
> (condition-case nil
> (atomic-change-group
> (funcall the-indentation-function)
> (when (=0 (current-indentation))
> (signal 'barfout nil)))
> (barfout))
Thanks David and Juanma, that was what I needed.
prev parent reply other threads:[~2008-05-06 17:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-06 10:04 Scary undo Lennart Borgman (gmail)
2008-05-06 10:11 ` Juanma Barranquero
2008-05-06 10:15 ` David Kastrup
2008-05-06 17:36 ` Lennart Borgman (gmail) [this message]
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