From: Drew Adams <drew.adams@oracle.com>
To: Raffaele Ricciardi <rfflrccrd@gmail.com>, help-gnu-emacs@gnu.org
Subject: RE: How does `undo` know that `keyboard-quit`has been called?
Date: Fri, 7 Nov 2014 14:02:48 -0800 (PST) [thread overview]
Message-ID: <b6e3f243-807f-4528-b604-99e91b282d7b@default> (raw)
In-Reply-To: <cc4sbmF8oioU1@mid.individual.net>
> I would like to write a command that behaves like `undo`, that is: a
> command that reverses its behaviour when the user calls `keyboard-
> quit`.
> I have read the Lisp code for both `undo` and `keyboard-quit` and
> I can't understand how `undo` achieves such behaviour. (I know that I
> could always advise `keyboard-quit`.)
If you just want to stop doing something when a user hits `C-g'
then wrap `condition-case' around the doing of the something:
(condition-case nil
(do-something)
(quit (handle-C-g-however-you-like)))
See the Elisp manual, node `Handling Errors`.
prev parent reply other threads:[~2014-11-07 22:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 21:36 How does `undo` know that `keyboard-quit`has been called? Raffaele Ricciardi
2014-11-07 22:02 ` Stefan Monnier
2014-11-07 22:02 ` Drew Adams [this message]
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