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Re: Scary undo

From: David Kastrup
Subject: Re: Scary undo
Date: Tue, 06 May 2008 12:15:47 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

"Lennart Borgman (gmail)" <address@hidden> 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
     (funcall the-indentation-function)
     (when (=0 (current-indentation))
       (signal 'barfout)))

David Kastrup

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