From: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>
Cc: teirllm@dms.auburn.edu, monnier+gnu/emacs@rum.cs.yale.edu,
miles@lsi.nec.co.jp, Kai.Grossjohann@CS.Uni-Dortmund.DE,
emacs-devel@gnu.org
Subject: Re: comint-carriage-motion causes severe problems.
Date: Wed, 03 Jul 2002 17:11:09 -0400 [thread overview]
Message-ID: <200207032111.g63LBAv25925@rum.cs.yale.edu> (raw)
In-Reply-To: 200207032057.g63KvX604721@aztec.santafe.edu
> I would argue for the desirability of Stefan's suggested additions to
> the hook machinery. I believe they are absolutely necessary. We have
> right here a very good example why.
>
> I think such a feature could be a good idea. Stefan, could you state
> the proposed specs (don't worry about implementation at this point)
> for the feature?
The spec corresponding (barring bugs) to my current implementation
is as follows:
Among the list of functions specified in a hook, you can now have
one of the form (not . FOO) which says "if you come across FOO
in the rest of the list, just ignore it".
I.e. if the value of a hook is (a (not . b) c b), then `run-hooks'
will only run `a' and `c' but not `b'. By "value of the hook" I mean
the combined local+global lists, so the above example could happen
in the case where the local value of the hook variable is
(a (not . b) c b) but could also happen if the local value is
(a (not . b) t) and the global value is (c b).
If you use remove-hook, add-hook, run-hooks, this new functionality
means that calling `remove-hook' will make sure that a subsequent
`run-hooks' will not run this code.
Actually, there are some unclear semantics when you do things like
(add-hook 'foo 'bar)
(add-hook 'foo 'bar nil 'local)
(remove-hook 'foo 'bar 'local)
The current code removes `bar' from the local value of `foo' but
leaves it in the global one. My new code does the same and only a second
(remove-hook 'foo 'bar 'local) will add a (not . bar) such that the
global setting is overridden. This decision was arbitrary (mostly
trying to minimize the change in behavior for better compatibility).
Stefan
next prev parent reply other threads:[~2002-07-03 21:11 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-02 0:35 comint-carriage-motion causes severe problems Luc Teirlinck
2002-07-02 1:32 ` Miles Bader
2002-07-02 8:33 ` Kai Großjohann
2002-07-02 8:46 ` Miles Bader
2002-07-02 15:34 ` Stefan Monnier
2002-07-02 16:18 ` Luc Teirlinck
2002-07-03 20:57 ` Richard Stallman
2002-07-03 21:11 ` Stefan Monnier [this message]
2002-07-04 1:18 ` Luc Teirlinck
2002-07-04 15:43 ` Stefan Monnier
2002-07-04 16:56 ` Luc Teirlinck
2002-07-04 17:04 ` Stefan Monnier
2002-07-04 17:18 ` Kai Großjohann
2002-07-04 17:31 ` Luc Teirlinck
2002-07-04 18:21 ` Miles Bader
2002-07-04 1:38 ` Luc Teirlinck
2002-07-04 3:49 ` Luc Teirlinck
[not found] ` <200207040337.WAA22499@eel.dms.auburn.edu>
[not found] ` <200207041531.g64FVRp29714@rum.cs.yale.edu>
2002-07-04 16:07 ` Luc Teirlinck
2002-07-04 18:24 ` Richard Stallman
2002-07-04 20:19 ` Luc Teirlinck
2002-07-05 22:07 ` Richard Stallman
2002-07-05 0:47 ` Luc Teirlinck
2002-07-05 22:07 ` Richard Stallman
2002-08-07 1:16 ` Luc Teirlinck
2002-08-07 20:58 ` Richard Stallman
2002-08-07 22:19 ` Luc Teirlinck
2002-08-07 22:27 ` Luc Teirlinck
2002-08-09 2:47 ` Richard Stallman
2002-08-18 2:39 ` Luc Teirlinck
2002-08-18 3:01 ` Luc Teirlinck
2002-08-18 3:59 ` Luc Teirlinck
2002-08-19 5:04 ` Miles Bader
2002-07-02 17:08 ` Luc Teirlinck
2002-07-02 19:45 ` Richard Stallman
2002-07-03 0:02 ` Miles Bader
2002-07-03 0:06 ` Miles Bader
2002-07-04 7:07 ` Richard Stallman
2002-07-03 1:51 ` Luc Teirlinck
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