From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Drew Adams" <drew.adams@oracle.com>
Cc: 'martin rudalics' <rudalics@gmx.at>, 'Emacs-Devel' <emacs-devel@gnu.org>
Subject: Re: predicate group-p to see if a group exists?
Date: Fri, 01 Feb 2008 09:53:49 -0500 [thread overview]
Message-ID: <jwvwspolold.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <002401c864a1$9bce4d00$864a908d@us.oracle.com> (Drew Adams's message of "Thu, 31 Jan 2008 23:11:03 -0800")
> Granted, most users of `defgroup', `defcustom', and `defface' will not need
> to test whether a given group exists, but some will. I still have the
> question whether we shouldn't have a function `group-p'.
IIRC I've looked into it at some point. The problem is that currently,
the data necessary to write custom-group-p is absent.
`customize-read-group' uses the following predicate for completion
purposes:
(lambda (symbol)
(or (and (get symbol 'custom-loads)
(not (get symbol 'custom-autoload)))
(get symbol 'custom-group)))
So we could use the above as the definition of custom-group-p, but IIRC
it's not 100% reliable/correct, and the lack of comments explaining why
we check (and (get symbol 'custom-loads) (not (get symbol 'custom-autoload)))
is also a significant problem.
Stefan
next prev parent reply other threads:[~2008-02-01 14:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-31 23:03 predicate group-p to see if a group exists? Drew Adams
2008-02-01 6:40 ` martin rudalics
2008-02-01 7:11 ` Drew Adams
2008-02-01 14:53 ` Stefan Monnier [this message]
2008-02-01 15:00 ` Lennart Borgman (gmail)
2008-02-02 7:39 ` Richard Stallman
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