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Re: Arguing for a nilp function and where to put it
From: |
Eli Zaretskii |
Subject: |
Re: Arguing for a nilp function and where to put it |
Date: |
Sat, 01 Apr 2023 09:10:02 +0300 |
> From: Pedro Andres Aranda Gutierrez <paaguti@gmail.com>
> Date: Sat, 1 Apr 2023 07:37:44 +0200
>
> 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.
Why cannot you use the existing function 'null'?
If 'null' doesn't fit the bill, please explain why.
- Arguing for a nilp function and where to put it, Pedro Andres Aranda Gutierrez, 2023/04/01
- Re: Arguing for a nilp function and where to put it, tomas, 2023/04/01
- Re: Arguing for a nilp function and where to put it, Michael Albinus, 2023/04/01
- Re: Arguing for a nilp function and where to put it,
Eli Zaretskii <=
- Re: Arguing for a nilp function and where to put it, Pedro Andres Aranda Gutierrez, 2023/04/01
- Re: Arguing for a nilp function and where to put it, Roland Winkler, 2023/04/02
- Re: Arguing for a nilp function and where to put it, Richard Stallman, 2023/04/02
- Re: Arguing for a nilp function and where to put it, Emanuel Berg, 2023/04/03
- Re: Arguing for a nilp function and where to put it, Andreas Schwab, 2023/04/03
- Re: Arguing for a nilp function and where to put it, Roland Winkler, 2023/04/03
- Re: Arguing for a nilp function and where to put it, Emanuel Berg, 2023/04/03
- Re: Arguing for a nilp function and where to put it, Richard Stallman, 2023/04/03
- Re: Arguing for a nilp function and where to put it, Emanuel Berg, 2023/04/05