From: "Drew Adams" <drew.adams@oracle.com>
To: "'martin rudalics'" <rudalics@gmx.at>
Cc: 'Emacs-Devel' <emacs-devel@gnu.org>
Subject: RE: predicate group-p to see if a group exists?
Date: Thu, 31 Jan 2008 23:11:03 -0800 [thread overview]
Message-ID: <002401c864a1$9bce4d00$864a908d@us.oracle.com> (raw)
In-Reply-To: <47A2BEEA.2010702@gmx.at>
> > There seems to be no predicate to test whether a particular group is
> > defined. Should there be one? (group-p 'foo)
>
> You could write
>
> (defgroup my-foo nil "jjjj"
> :group (if (get 'foo 'custom-group) 'foo 'bar))
>
> because it's unlikely that a custom group doesn't have any members
> (except for the case when you're just specifying it - like my-foo).
Yes, but that wouldn't occur to most people. Using `defgroup', `defcustom',
and `defface' shouldn't require knowledge of how Customize is implemented.
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'.
next prev parent reply other threads:[~2008-02-01 7:11 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 [this message]
2008-02-01 14:53 ` Stefan Monnier
2008-02-01 15:00 ` Lennart Borgman (gmail)
2008-02-02 7:39 ` Richard Stallman
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