From: Sam Steingold <sds@gnu.org>
To: emacs-devel@gnu.org, Eli Zaretskii <eliz@gnu.org>
Subject: Re: case-insensitive string comparison
Date: Tue, 26 Jul 2022 10:16:08 -0400 [thread overview]
Message-ID: <lzpmhs0xjr.fsf@3c22fb11fdab.ant.amazon.com> (raw)
In-Reply-To: <83lesgc9ch.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 26 Jul 2022 16:05:50 +0300")
> * Eli Zaretskii <ryvm@tah.bet> [2022-07-26 16:05:50 +0300]:
>
>> From: Sam Steingold <sds@gnu.org>
>> Date: Mon, 25 Jul 2022 15:39:34 -0400
>>
>> > * Eli Zaretskii <ryvm@tah.bet> [2022-07-25 18:58:19 +0300]:
>> >
>> >> > (string-collate-equalp "a" "A" current-locale-environment t)
>> >> > ==> nil
>> >> > current-locale-environment
>> >> > ==> "en_US.UTF-8"
>> >
>> > I cannot reproduce this:
>> >
>> > (string-collate-equalp "a" "A" current-locale-environment t)
>> > => t
>> > current-locale-environment
>> > => "en_US.UTF-8"
>> >
>> > What OS is this, and which Emacs version?
>>
>> GNU Emacs 29.0.50 (build 5, x86_64-apple-darwin21.5.0, NS appkit-2113.50 Version 12.4 (Build 21F79))
>> of 2022-07-25
>> Repository revision: ffe12ff2503917e47c0356195b31430996c148f9
>> Repository branch: master
>> Windowing system distributor 'Apple', version 10.3.2113
>> System Description: macOS 12.4
>
> Could be something macOS-specific. Maybe your system doesn't define
> the __STDC_ISO_10646__ feature? In that case, string-collate-equalp
> (see the doc string) behaves like string-equal, and that one doesn't
> have a case-insensitive variant.
How do I find out?
--8<---------------cut here---------------start------------->8---
echo > .zzz.c;
gcc -E -dM .zzz.c | grep __STDC_ISO_10646__
--8<---------------cut here---------------end--------------->8---
does not print anything, but maybe I need to `#include' something?
> In general, locale-specific comparison is a bad idea in Emacs...
> For that reason, I suggest always using compare-strings instead.
Thank you very much for the clear and detailed explanation!
>> >> It is okay to add a `string-equal-ignore-case' based on `compare-strings'?
>> >> (even though it does not recognize "SS" and "ß" as equal)
>> >
>> > What's wrong with calling compare-strings directly?
>>
>> I want to be able to use `string-equal-ignore-case' as a :test argument
>> to things like `cl-find'.
>
> Then write a thin wrapper around compare-strings, and be done.
I think the need is sufficiently generic, e.g., BBDB provides such a
wrapper, as, I am sure, do many other packages.
Many core files can be simplified by using `string-equal-ignore-case'
(just like with the `string-prefix-p').
Thank again!
--
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://www.dhimmitude.org https://thereligionofpeace.com
When you are arguing with an idiot, your opponent is doing the same.
next prev parent reply other threads:[~2022-07-26 14:16 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 17:27 case-insensitive string comparison Sam Steingold
2022-07-19 18:06 ` Mattias Engdegård
2022-07-19 18:56 ` Sam Steingold
2022-07-20 4:39 ` tomas
2022-07-20 11:35 ` Eli Zaretskii
2022-07-20 13:30 ` tomas
2022-07-19 18:16 ` Stefan Kangas
2022-07-19 19:39 ` Roland Winkler
2022-07-19 22:47 ` Sam Steingold
2022-07-20 2:21 ` Roland Winkler
2022-07-20 3:01 ` Stefan Monnier
2022-07-20 16:22 ` Sam Steingold
2022-07-25 14:23 ` Sam Steingold
2022-07-25 15:58 ` Eli Zaretskii
2022-07-25 19:39 ` Sam Steingold
2022-07-26 13:05 ` Eli Zaretskii
2022-07-26 14:16 ` Sam Steingold [this message]
2022-07-26 15:53 ` Eli Zaretskii
2022-07-26 16:00 ` Sam Steingold
2022-07-26 16:16 ` Lars Ingebrigtsen
2022-07-26 14:43 ` Robert Pluim
2022-07-25 19:37 ` Bruno Haible
2022-07-26 3:24 ` Richard Stallman
2022-07-26 8:00 ` Helmut Eller
2022-07-26 12:21 ` Eli Zaretskii
2022-07-27 2:58 ` Richard Stallman
2022-07-31 8:24 ` Eli Zaretskii
2022-07-26 14:28 ` Sam Steingold
2022-07-26 15:42 ` Sam Steingold
2022-07-26 16:10 ` Eli Zaretskii
2022-07-26 18:56 ` Bruno Haible
2022-07-26 19:30 ` Eli Zaretskii
2022-07-20 16:24 ` Roland Winkler
2022-07-20 17:06 ` Sam Steingold
2022-07-20 17:16 ` Eli Zaretskii
2022-07-20 17:12 ` Eli Zaretskii
2022-07-20 17:37 ` Roland Winkler
2022-07-20 17:50 ` Eli Zaretskii
2022-07-20 18:10 ` Roland Winkler
2022-07-20 18:16 ` Eli Zaretskii
2022-07-20 18:18 ` [External] : " Drew Adams
2022-07-21 6:56 ` Eli Zaretskii
2022-07-21 14:19 ` Roland Winkler
2022-07-21 15:53 ` Eli Zaretskii
2022-07-21 16:35 ` Roland Winkler
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