From: Richard Stallman <rms@gnu.org>
To: Kelly Dean <kelly@prtime.org>
Cc: emacs-devel@gnu.org
Subject: Re: [PATCH] Run hook when variable is set
Date: Sat, 31 Jan 2015 18:16:44 -0500 [thread overview]
Message-ID: <E1YHhHQ-0006z1-1p@fencepost.gnu.org> (raw)
In-Reply-To: <cjC301nsl6E1qFVKQ0aQsRcZJIE2YBGCTfGCBBFHTS3@local> (message from Kelly Dean on Sat, 31 Jan 2015 09:23:07 +0000)
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> But what if it's documented? For example, it's documented that
> setting the variable cursor-type not only sets a variable, but
> also has the side effect of changing how the cursor is displayed.
That is safe because it does not run Lisp code when you set the
variable. Basically, redisplay looks at the value of the variable,
and that happens only when redisplay gets called.
> Disabling dynamic-cursor-mode could simply be another documented
> side effect of setting cursor-type.
If you do it by having redisplay check cursor-type and decide
what to do about the cursor mode, I have nothing against it.
However, having any variable, the binding of which can run Lisp code,
is an absolute disaster. If the price we pay for to avoid that disaster
is that we don't have the feature you would like, so be it.
> Besides that, hooks on setting variables would be useful for debugging.
No matter what they would be useful for, it is not worth the chaos
they would cause.
Maybe a specialized feature solely for debugging could be made safe.
--
Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
USA
www.fsf.org www.gnu.org
Skype: No way! That's nonfree (freedom-denying) software.
Use Ekiga or an ordinary phone call.
next prev parent reply other threads:[~2015-01-31 23:16 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-20 2:54 Proposal to change cursor appearance to indicate region activation Kelly Dean
2013-04-20 7:23 ` Drew Adams
2015-01-22 5:38 ` [PATCH] " Kelly Dean
2015-01-22 14:25 ` Stefan Monnier
2015-01-23 3:08 ` [PATCH] " Kelly Dean
2015-01-23 4:55 ` Stefan Monnier
2015-01-23 11:07 ` Kelly Dean
2015-01-23 17:49 ` Drew Adams
2015-01-24 3:06 ` Kelly Dean
2015-01-24 4:52 ` Stefan Monnier
2015-01-24 9:22 ` Kelly Dean
2015-01-25 14:29 ` Stefan Monnier
2015-01-28 9:15 ` [PATCH] Run hook when variable is set Kelly Dean
2015-01-28 9:23 ` [PATCH] Proposal to change cursor appearance to indicate region activation Kelly Dean
2015-01-28 11:24 ` David Kastrup
2015-01-28 12:13 ` David Kastrup
2015-01-29 10:46 ` Kelly Dean
2015-01-29 11:16 ` David Kastrup
2015-01-30 7:20 ` Kelly Dean
2015-01-30 9:19 ` David Kastrup
2015-01-30 10:05 ` Kelly Dean
2015-01-30 10:12 ` David Kastrup
2015-01-30 9:43 ` Kelly Dean
2015-01-28 19:25 ` [PATCH] Run hook when variable is set Stefan Monnier
2015-01-29 8:20 ` Kelly Dean
2015-01-29 8:28 ` Lars Ingebrigtsen
2015-01-29 14:58 ` Stefan Monnier
2015-01-30 7:34 ` Kelly Dean
2015-01-30 15:55 ` Stefan Monnier
2015-01-31 9:18 ` Kelly Dean
2015-01-31 20:48 ` Stefan Monnier
2015-02-02 5:40 ` Kelly Dean
2015-02-02 15:57 ` Stefan Monnier
2015-02-03 19:56 ` Kelly Dean
2015-02-03 22:49 ` Stefan Monnier
2015-02-05 3:10 ` [PATCH] (Updated) " Kelly Dean
2015-02-05 13:57 ` Stefan Monnier
2015-02-06 5:34 ` Kelly Dean
2015-02-06 14:42 ` Stefan Monnier
2015-02-07 12:27 ` Kelly Dean
2015-02-07 15:09 ` Stefan Monnier
2015-02-09 3:24 ` Kelly Dean
2015-02-12 19:58 ` Stefan Monnier
2015-02-13 23:08 ` Kelly Dean
2015-02-14 0:55 ` Stefan Monnier
2015-02-14 22:19 ` Kelly Dean
2015-02-15 20:25 ` Stefan Monnier
2015-02-17 2:22 ` Kelly Dean
2015-02-17 23:07 ` Richard Stallman
2015-02-18 3:19 ` The purpose of makunbound (Was: Run hook when variable is set) Kelly Dean
2015-02-18 5:48 ` The purpose of makunbound Stefan Monnier
2015-02-18 8:51 ` Kelly Dean
2015-02-18 14:34 ` Stefan Monnier
2015-02-18 18:53 ` Kelly Dean
2015-02-18 22:42 ` Stefan Monnier
2015-02-19 10:36 ` Kelly Dean
2015-02-22 0:18 ` Kelly Dean
2015-02-19 10:45 ` Kelly Dean
2015-02-19 13:33 ` Stefan Monnier
2015-02-19 23:51 ` Kelly Dean
2015-02-20 1:59 ` Stefan Monnier
2015-02-20 9:35 ` Kelly Dean
2015-02-20 16:55 ` Stefan Monnier
2015-02-20 2:58 ` Stephen J. Turnbull
2015-02-20 0:56 ` Richard Stallman
2015-02-20 9:02 ` Kelly Dean
2015-02-20 15:41 ` Richard Stallman
2015-02-21 5:45 ` Stephen J. Turnbull
2015-02-22 0:32 ` Kelly Dean
2015-02-22 8:45 ` Andreas Schwab
2015-02-18 5:15 ` [PATCH] (Updated) Run hook when variable is set Kelly Dean
2015-02-18 22:37 ` Stefan Monnier
2015-02-18 22:37 ` Stefan Monnier
2015-02-19 10:35 ` Kelly Dean
2015-02-19 13:30 ` Stefan Monnier
2015-02-20 6:48 ` Kelly Dean
2015-02-20 19:29 ` Stefan Monnier
2015-02-21 14:18 ` Kelly Dean
2015-02-21 20:51 ` Stefan Monnier
2015-02-22 0:32 ` Kelly Dean
2015-02-22 10:40 ` Stephen J. Turnbull
2015-02-22 21:35 ` Stefan Monnier
2015-02-23 3:09 ` Kelly Dean
2015-02-23 4:19 ` Stefan Monnier
2015-02-20 20:27 ` Proposal for debugging/testing option Kelly Dean
2015-02-24 16:28 ` Stefan Monnier
2015-02-14 20:37 ` [PATCH] (Updated) Run hook when variable is set Johan Bockgård
2015-02-15 19:36 ` Stefan Monnier
2015-02-15 19:53 ` Patches: inline vs. attachment, compressed vs. uncompressed. [was: Run hook when variable is set] Alan Mackenzie
2015-02-06 9:55 ` [PATCH] (Updated) Run hook when variable is set Kelly Dean
2015-01-30 23:29 ` [PATCH] " Richard Stallman
2015-01-31 9:23 ` Kelly Dean
2015-01-31 23:16 ` Richard Stallman [this message]
2015-02-02 5:41 ` Kelly Dean
2015-02-01 2:04 ` Alexis
2015-02-01 4:05 ` Stefan Monnier
2015-02-01 8:58 ` David Kastrup
2015-01-29 16:06 ` Eli Zaretskii
2015-01-30 7:14 ` Kelly Dean
2015-01-30 9:08 ` Eli Zaretskii
2015-01-23 20:34 ` [PATCH] Proposal to change cursor appearance to indicate region activation Stefan Monnier
2015-01-24 0:25 ` Kelly Dean
2015-01-23 10:01 ` Tassilo Horn
2015-01-23 17:49 ` Drew Adams
2015-01-23 10:06 ` Eli Zaretskii
2015-01-23 11:40 ` Kelly Dean
2015-01-23 11:56 ` Eli Zaretskii
2015-01-22 5:41 ` Kelly Dean
2013-11-23 13:34 ` Stefan Monnier
2013-11-23 20:25 ` Drew Adams
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