From: Pedro Andres Aranda Gutierrez <paaguti@gmail.com>
To: emacs-devel <emacs-devel@gnu.org>
Subject: Arguing for a nilp function and where to put it
Date: Sat, 1 Apr 2023 07:37:44 +0200 [thread overview]
Message-ID: <CAO48Bk_E7XSLB7X_Q8T5M7gifUBF=-50cGUNjRfVLbkhVyRykg@mail.gmail.com> (raw)
Use case for a nilp function:
I have a buffer-local variable with a default value, and I want to
allow to (silently) set it to nil (and only to nil) from
.dir-locals.el or Local Variables.
Currently I have
(defun nilp(v) (unless v t))
and I use it with
(put '<variable> 'safe-local-variable #'nilp)
which is much cleaner than
(put '<variable> 'safe-local-variable (lambda (p) (unless p t)))
every time I need it. I think other people may benefit from having
this simple function as part of Emacs and I'm not sure whether the
elisp form would be better than something more lower level like
integerp and in which file it would reside best.
/PA
--
Fragen sind nicht da um beantwortet zu werden,
Fragen sind da um gestellt zu werden
Georg Kreisler
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next reply other threads:[~2023-04-01 5:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-01 5:37 Pedro Andres Aranda Gutierrez [this message]
2023-04-01 6:01 ` Arguing for a nilp function and where to put it tomas
2023-04-01 6:07 ` Michael Albinus
2023-04-01 6:10 ` Eli Zaretskii
2023-04-01 7:09 ` Pedro Andres Aranda Gutierrez
2023-04-02 21:28 ` Roland Winkler
2023-04-03 3:02 ` Richard Stallman
2023-04-03 3:34 ` Emanuel Berg
2023-04-03 12:46 ` Andreas Schwab
2023-04-03 18:48 ` Roland Winkler
2023-04-03 23:44 ` Emanuel Berg
2023-04-04 2:56 ` Richard Stallman
2023-04-05 7:24 ` Emanuel Berg
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