From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Toru TSUNEYOSHI <t_tuneyosi@hotmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: enable sorting by version in `ls-lisp-handle-switches'
Date: Thu, 11 Mar 2010 14:20:21 -0500 [thread overview]
Message-ID: <jwvaaued6at.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <20100312.030317.128157175.tune@to.email.ne.jp> (Toru TSUNEYOSHI's message of "Fri, 12 Mar 2010 03:03:17 +0900")
>> You may also want to take a look at mpc-compare-strings which does
>> something similar, tho simpler (not specific to versions, just taking
>> care of numbers).
> I checked `mpc-compare-strings'.
> `mpc-compare-strings' and `string-logical-lessp' are different.
Indeed, I don't expect them to behave identically.
> (mpc-compare-strings "01-00001" "1-1") => 1
> (string-logical-lessp "01-00001" "1-1") => nil
> (mpc-compare-strings "1-1" "01-00001") => -1
> (string-logical-lessp "1-1" "01-00001") => nil
I remember having struggled over "correct" handling (meaning, making
sure that it's transitive) of leading zeroes in
mpc-compare-strings, so I'm not very surprised.
I don't really care whether "1-1" is considered larger, smaller or
equivalent to "01-00001". I don't think such issues show up much in
practice and I'm not sure as a user I'd prefer one over the other.
The implementation strategy is also very different, so I'd expect the
performance behavior to be quite different as well.
Stefan
next prev parent reply other threads:[~2010-03-11 19:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-07 4:46 enable sorting by version in `ls-lisp-handle-switches' Toru TSUNEYOSHI
2010-03-07 14:49 ` Stefan Monnier
[not found] ` <20100312.030317.128157175.tune@to.email.ne.jp>
2010-03-11 19:20 ` Stefan Monnier [this message]
2010-03-12 5:31 ` Toru TSUNEYOSHI
2010-03-12 7:00 ` Toru TSUNEYOSHI
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