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* no empty (zero) string predicate in Elisp
@ 2015-04-25  3:44 Emanuel Berg
  2015-04-25  9:26 ` Nicolas Petton
                   ` (3 more replies)
  0 siblings, 4 replies; 27+ messages in thread
From: Emanuel Berg @ 2015-04-25  3:44 UTC (permalink / raw)
  To: help-gnu-emacs

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!

Of course, I can do yet a third file -
my-string-predicate.el - and require that from both
files. But I feel I shouldn't have to. Such basic
things shouldn't have to be solved on a Joe Hacker
basis. It should be included. And not in ELPA,
in Emacs!

I'll report this as a bug unless someone presents
really convincing stuff why it shouldn't be included.
Or, if there is something equivalent - equivalent in
the syntactic sense, I mean - I am aware of

   (= (length str) 0)

and

   (equal "" str)

but it should be a binary operator.

[1] http://user.it.uu.se/~embe8573/conf/emacs-init/w3m/w3m-unisearch.el

-- 
underground experts united
http://user.it.uu.se/~embe8573


^ permalink raw reply	[flat|nested] 27+ messages in thread

end of thread, other threads:[~2015-05-16 15:27 UTC | newest]

Thread overview: 27+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-04-25  3:44 no empty (zero) string predicate in Elisp Emanuel Berg
2015-04-25  9:26 ` Nicolas Petton
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 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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