NAME
    Gentoo::Util::VirtualDepend - Hard-coded replacements for perl-core/
    dependencies and dependencies with odd names in Gentoo

VERSION
    version 0.001000

SYNOPSIS
      use Gentoo::Util::VirtualDepend;

      my $v = Gentoo::Util::VirtualDepend->new();

      # somewhere in complex dependency resolution

      my $cpan_module = spooky_function();
      my $gentoo_dependency;

      if ( $v->has_module_override( $cpan_module ) ) {
        $gentoo_dependency = $v->get_module_override( $cpan_module );
      } else {
        # do it the hard way.
      }

    If you're trying to be defensive and you're going to map the modules to
    distributions the hard way ( trust me, the code is really ugly ), then
    you may instead want

      if ( $v->has_dist_override( $cpan_dist ) ) {
        $gentoo_dependency = $v->get_dist_override( $cpan_dist );
      } else {
        # fallback to using dev-perl/Foo-Bar
      }

    Which basically serves as a distribution name translator.

  WHY YOU WANT TO DO THAT
    Well ...

         { requires => { Foo => 1.0 }}

         Foo is in Bar

         Foo 1.0 could have been shipped in in Bar-1.0, Bar-0.5, or Bar-2.0 for all you know.

    That's the unfortunate reality of "CPAN" dependencies.

    So if you naively map

        Foo-1.0 → >=dev-lang/Bar-1.0

    You might get breakage if "Foo 1.0" didn't ship till "Bar-2.0", and the
    user has "Bar-1.0" → Shower of sparks.

DESCRIPTION
    This module serves as a low level glue layer for the handful of manual
    mappings that are needed in Gentoo due to things not strictly tracking
    upstream.

    "CPANPLUS::Dist::Gentoo" has similar logic to this, but not as simple (
    or for that matter, usable without "CPANPLUS" )

    This module is not intended to be used entirely on its own, but as a
    short-circuit before calling complicated "MetaCPAN" code.

METHODS
  has_module_override
      $v->has_module_override( $module )

    Returns true if there is a known mapping for $module in "Gentoo" that is
    unusual and may require translation.

    Will return true for anything that is either a "virtual" or has an
    unusual name translation separating it from "CPAN".

  get_module_override
      $v->get_module_override( $module )

    Returns a "Gentoo" dependency atom corresponding to $module if there is
    a known mapping for $module.

    For instance,

      $v->get_module_override('ExtUtils::MakeMaker')

    Emits:

      virtual/perl-ExtUtilsMakeMaker

    If "ExtUtils::MakeMaker" is one day de-cored (Hah!, dreams are free)
    then "has_module_override" will return false, and that instructs you to
    go back to assuming it is in "dev-perl/"

  has_dist_override
      $v->has_dist_override( $distname )

    Similar to "has_module_override" but closer to the dependency spec.

    Will return true for anything that is either a "virtual" or has an
    unusual name translation separating it from "CPAN".

  get_dist_override
      $v->get_dist_override( $distname )

    Similar to "get_module_override" but closer to the dependency spec.

    For instance:

      $v->get_dist_override('PathTools')

    Emits:

      virtual/perl-File-Spec

    Because "Gentoo" is quirky like that.

AUTHOR
    Kent Fredric <kentnl@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2014 by Kent Fredric
    <kentfredric@gmail.com>.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.