Re: enable sorting by version in `ls-lisp-handle-switches'

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> 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