From: storm@cua.dk (Kim F. Storm)
Cc: <emacs-devel@gnu.org>
Subject: Re: Suggestion: Simple way to make conditional key bindings.
Date: 23 Aug 2002 15:16:11 +0200 [thread overview]
Message-ID: <5xadnd3eck.fsf@kfs2.cua.dk> (raw)
In-Reply-To: <3D49FF140074EFAE@mel-rta7.wanadoo.fr> (added by postmaster@wanadoo.fr)
"David PONCE" <David.Ponce@wanadoo.fr> writes:
> > (global-set-key "\C-y"
> > '(cond
> > ((and kill-ring (table-recognize-table (car kill-ring)))
> > yank-with-properties)
> > (t yank)))
> >
> >
>
> It seems that you can do something similar this way:
>
> (global-set-key "\C-y" '(menu-item "my-filter" :filter my-filter))
>
> (defun my-filter (&rest ignore)
> (cond
> ((and kill-ring (table-recognize-table (car kill-ring)))
> 'yank-with-properties)
> (t 'yank)))
>
> Am I wrong?
Not at all [that's more or less how it is implemented].
But IMO, the `menu-item' syntax is awful, and using a
filter function is an added complexity which is pretty
unflexible.
I failed to mention a very important benefit of integrating this in
the keymaps directly:
It will then be quite trivial to enhance `define-key' to handle
conditional bindings:
(define-key global-map "\C-y" 'yank) ; this sets the default
(define-key global-map "\C-y" 'yank-with-properties
'(and kill-ring (table-recognize-table (car kill-ring))))
The second call would automatically changes the non-cond binding into
a cond binding with the previous binding as default.
To remove a conditional binding, we could use either of
the following:
(define-key global-map "\C-y" 'yank-with-properties t)
(define-key global-map "\C-y" nil
'(and kill-ring (table-recognize-table (car kill-ring))))
Removing the last condtional binding could collapse the
resulting (cond ((t yank))) back into 'yank.
--
Kim F. Storm <storm@cua.dk> http://www.cua.dk
next parent reply other threads:[~2002-08-23 13:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3D49FF140074EFAE@mel-rta7.wanadoo.fr>
2002-08-23 13:16 ` Kim F. Storm [this message]
2002-08-23 17:22 ` Suggestion: Simple way to make conditional key bindings Stefan Monnier
2002-08-25 23:33 ` Kim F. Storm
2002-08-26 15:47 ` Stefan Monnier
2002-08-26 19:33 ` Miles Bader
2002-08-27 19:05 ` Richard Stallman
2002-08-27 22:58 ` Kim F. Storm
2002-08-28 23:32 ` Richard Stallman
2002-08-29 8:54 ` Kim F. Storm
2002-08-28 1:00 ` Miles Bader
2002-08-28 1:22 ` Stefan Monnier
2002-08-27 11:23 ` Kim F. Storm
2002-08-23 12:52 David PONCE
-- strict thread matches above, loose matches on Subject: below --
2002-08-23 12:05 Kim F. Storm
2002-08-26 0:36 ` Richard Stallman
2002-08-26 16:21 ` Stefan Monnier
2002-08-30 10:27 ` Robert J. Chassell
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