GNU bug report logs - #18051
24.3.92; ls-lisp: Sorting; make ls-lisp-string-lessp a normal function?

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Michael Albinus <michael.albinus <at> gmx.de>,  Eli Zaretskii <eliz <at> gnu.org>
Cc: dmantipov <at> yandex.ru, 18051 <at> debbugs.gnu.org
Subject: bug#18051: [Emacs-diffs] trunk r117726: Add string collation.
Date: Wed, 27 Aug 2014 12:08:52 -0700

A couple more things.

First, the current algorithm looks only at LC_COLLATE, but the usual 
approach is to default LC_COLLATE to LANG if LC_COLLATE isn't set, and 
to have LC_ALL override LC_COLLATE.  Shouldn't Emacs take a similar 
approach, for compatibility?

More generally, it strikes me that string-collate-lessp will be quite 
slow due to the overhead of looking up the locale environment string and 
creating and destroying a locale for each string comparison.  Instead, 
shouldn't Emacs should have a locale object that the Emacs Lisp 
programmer can create, an object that encapsulates the low level 
locale_t object, and which can be passed as an optional argument to 
string-collate-lessp?  That way, string-collate-p would never have to 
inspect the environment itself, or to create or destroy a locale.

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