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From: Ihor Radchenko <yantar92@posteo.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 59275@debbugs.gnu.org
Subject: bug#59275: Unexpected return value of `string-collate-lessp' on Mac
Date: Wed, 16 Nov 2022 01:34:09 +0000	[thread overview]
Message-ID: <8735ajel7y.fsf@localhost> (raw)
In-Reply-To: <837czwi6yp.fsf@gnu.org>

Eli Zaretskii <eliz@gnu.org> writes:
>> > string-collate-lessp is inherently platform- (and locale-) dependent.
>> > Don't use it if you want consistent results across platforms and
>> > locales.
>> 
>> Is there a better alternative?
>
> Alternative to do what job?

Reliable sorting.
In particular, I am looking for a better PREDICATE argument for
`sort-subr' for case-sensitive and case-insensitive sorting of strings.

>> Also, do I miss something, or is this pitfall not documented in the
>> docstring of `string-collate-lessp'?
>
> It isn't? then what is this about:
>
>   This function obeys the conventions for collation order in your
>   locale settings.  For example, punctuation and whitespace characters
>   might be considered less significant for sorting:
>
>   (sort '("11" "12" "1 1" "1 2" "1.1" "1.2") 'string-collate-lessp)
>     => ("11" "1 1" "1.1" "12" "1 2" "1.2")
>   [...]
>   To emulate Unicode-compliant collation on MS-Windows systems,
>   bind ‘w32-collate-ignore-punctuation’ to a non-nil value, since
>   the codeset part of the locale cannot be "UTF-8" on MS-Windows.

The above sounds like we just need to worry about some edge cases where
different approaches may exist to sorting. Like with punctuation,
numbers, and spaces.

Having

  (string-collate-lessp "a" "B" "C" t)  ; => nil

is totally unexpected because case-insensitive "a"<"B"<"C" sounds like
the only reasonable outcome.

I'd like the warning to be even more prominent.

Feel free to disagree.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>





  reply	other threads:[~2022-11-16  1:34 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-15  4:08 bug#59275: Unexpected return value of `string-collate-lessp' on Mac Ihor Radchenko
2022-11-15  9:51 ` Robert Pluim
2022-11-16  3:47   ` Ihor Radchenko
2022-11-15 13:46 ` Eli Zaretskii
2022-11-15 15:05   ` Ihor Radchenko
2022-11-15 15:16     ` Eli Zaretskii
2022-11-16  1:34       ` Ihor Radchenko [this message]
2022-11-16 13:00         ` Eli Zaretskii
2022-11-21  7:28           ` Ihor Radchenko
2022-11-21 13:31             ` Eli Zaretskii
2022-11-22  1:24               ` Ihor Radchenko
2022-11-22 12:56                 ` Eli Zaretskii
2022-11-23 10:39                   ` Ihor Radchenko
2022-11-23 14:58                     ` Eli Zaretskii
2022-11-24  2:22                       ` Ihor Radchenko
2022-11-24  7:23                         ` Eli Zaretskii
2022-11-26  2:03                   ` Ihor Radchenko
2022-11-26  8:06                     ` Eli Zaretskii
2022-11-26  8:47                       ` Ihor Radchenko
2022-11-26  9:22                         ` Eli Zaretskii
2022-11-27 14:00                           ` Maxim Nikulin
2022-11-27 14:23                             ` Eli Zaretskii
2022-11-27 15:19                               ` Maxim Nikulin
2022-11-27 15:42                                 ` Eli Zaretskii

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