On Wed, May 20, 2009 at 5:01 AM, Ulrich Mueller <ulm@gentoo.org> wrote:

${PORTDIR}/app-misc/foo/foo-1a_live.ebuild
${PORTDIR}/app-misc/foo-1a/foo-1a-live.ebuild

With our current versioning scheme the rule is very simple: ${P} is
split into ${PN} and ${PV} at the last hyphen. This can be done in a
straight forward way by regexp matching, and I would really hate to
lose this nice property.

Ulrich

$str="app-misc/foo/foo-1a_live.ebuild";
$str =~ /([^/]+)/([^/]+)/\2(.*).ebuild/
( $category, $package, $version ) = ( $1, $2, $3 )

Simple enough on a supporting language. Naive maybe, but has worked well for me thus far.

It appears to be more a problem disambiguating from the user-input end of the spectrum, and this scenario would be more likely to happen if for some insane crack-fueled reason both packages were to exist. Even then,

app-misc/foo-1a # must always resolve to "app-misc/foo-1a" due to no = stating that it needs a version part
=app-misc/foo-1a # must always resolve to "app-misc/foo" due to the = stating a mandatory version part. ( =cat/pack is invalid )

--
Kent