From: Nicolas Petton <nicolas@petton.fr>
To: Emanuel Berg <embe8573@student.uu.se>
Cc: help-gnu-emacs@gnu.org
Subject: Re: no empty (zero) string predicate in Elisp
Date: Sat, 25 Apr 2015 11:26:39 +0200 [thread overview]
Message-ID: <87wq107e40.fsf@petton.fr> (raw)
In-Reply-To: <87h9s4rhx5.fsf@debian.uxu>
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Emanuel Berg writes:
> In one of my w3m extensions [1] I have
>
> (defun empty-string-p (str)
> (string= str "") )
>
> which obviously has nothing to do with w3m. Well, it's
> been known to happen. I can live with having it there.
>
> However, the next time I want to use it in some other
> file the byte-compiler tells me
>
> In end of data: wrap-search.el:98:1:Warning: the
> function `empty-string-p' is not known to
> be defined.
>
> OK, I get that away with
>
> (require 'w3m-unisearch) ; get empty-string-p
>
> But now I have a mention of w3m, in a file that has
> nothing to do with w3m, to get empty-string-p, which
> has nothing to do with w3m!
Hi!
You can use `string-empty-p' from subr-x.el or `seq-empty-p' from
seq.el (which works on all sequence data types).
seq.el will be included in Emacs 25.1, but in the meantime you can
install it from GNU Elpa.
Cheers,
Nico
--
Nicolas Petton
http://nicolas-petton.fr
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next prev parent reply other threads:[~2015-04-25 9:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 3:44 no empty (zero) string predicate in Elisp Emanuel Berg
2015-04-25 9:26 ` Nicolas Petton [this message]
2015-05-16 9:23 ` Nicolas Petton
2015-05-16 13:22 ` Bozhidar Batsov
2015-05-16 13:28 ` Bozhidar Batsov
2015-05-16 13:36 ` Bozhidar Batsov
2015-05-16 13:46 ` Eli Zaretskii
2015-05-16 16:17 ` Bozhidar Batsov
2015-05-16 13:43 ` Stefan Monnier
2015-05-16 15:27 ` Drew Adams
[not found] ` <mailman.1583.1429954907.904.help-gnu-emacs@gnu.org>
2015-04-25 11:22 ` Emanuel Berg
2015-04-25 13:30 ` Stefan Monnier
[not found] ` <mailman.1591.1429968677.904.help-gnu-emacs@gnu.org>
2015-04-25 14:48 ` Pascal J. Bourguignon
2015-04-26 2:52 ` Stefan Monnier
2015-04-27 10:28 ` zerop: compiler macro vs defsubst (was: no empty (zero) string predicate in Elisp) Nicolas Richard
2015-04-27 12:19 ` zerop: compiler macro vs defsubst Stefan Monnier
[not found] ` <mailman.1626.1430016741.904.help-gnu-emacs@gnu.org>
2015-04-26 4:06 ` no empty (zero) string predicate in Elisp Pascal J. Bourguignon
2015-04-26 21:25 ` Stefan Monnier
2015-04-26 4:26 ` Rusi
2015-04-26 12:36 ` Emanuel Berg
2015-04-26 15:03 ` Pascal J. Bourguignon
2015-04-26 18:34 ` Emanuel Berg
2015-04-26 18:59 ` Marcin Borkowski
[not found] ` <mailman.1658.1430074770.904.help-gnu-emacs@gnu.org>
2015-04-26 19:06 ` Emanuel Berg
2015-04-26 20:11 ` Marcin Borkowski
[not found] ` <mailman.1662.1430079142.904.help-gnu-emacs@gnu.org>
2015-04-27 1:00 ` Emanuel Berg
2015-04-26 17:28 ` Rusi
2015-04-26 18:39 ` Emanuel Berg
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