[Distutils] PEP 386 status - last round here ?

[M.-A. Lemburg]

Here's another take at a minimal change to the format which
includes the things we discussed, adds a few more aliases
for the "post" and "dev" markers and also adds optional
underscores for more readability.

VERSION_RE = re.compile(r'''
    ^
    (?P<version>\d+\.\d+)          # minimum 'N.N'
    (?P<extraversion>(?:\.\d+)*)   # any number of extra '.N' segments
    (?:                            # pre-release tag
        _?
        (?P<prerel>(a|alpha|b|beta|c|rc))
        _?
        (?P<prerelversion>\d+(?:\.\d+)*)
    )?
    (?P<postdev>
        (\.(post|fix|sp)_?(?P<post>\d+))?
        (\.(dev|pre|build|nightly)_?(?P<dev>\d+))?
    )?
    $''', re.VERBOSE + re.I)

Examples:

  3.2.0a0.20091125
< 3.2.0a1
= 3.2.0_alpha_1
< 3.2.0a1.20091125
< 3.2.0rc1
= 3.2.0c1
< 3.2.0rc1.20091125
= 3.2.0_rc1.20091125
< 3.2.0
< 3.2.0.sp1
= 3.2.0.fix1
= 3.2.0.post1

One nit I have with the order of the N.N.devN version is that it is regarded
"more" than any of the pre-release tags, but less than the release itself:

  1.0a1
< 1.0rc1
< 1.0.dev456
< 1.0

IMHO, the order should be:

  1.0.dev456
< 1.0a1.dev456
< 1.0a1
< 1.0rc1.dev456
< 1.0rc1
< 1.0

since the .dev versions are really only snapshots leading up to
some release, i.e. 1.0.dev456 is a snapshot leading up to the
first pre-release of the 1.0 :-)

-- 
Marc-Andre Lemburg
eGenix.com

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