phpMan > man > CPAN::Meta::Merge

NAME
    CPAN::Meta::Merge - Merging CPAN Meta fragments

VERSION
    version 2.150010

SYNOPSIS
     my $merger = CPAN::Meta::Merge->new(default_version => "2");
     my $meta = $merger->merge($base, @additional);

DESCRIPTION
METHODS
  new
    This creates a CPAN::Meta::Merge object. It takes one mandatory named argument, "version",
    declaring the version of the meta-spec that must be used for the merge. It can optionally take
    an "extra_mappings" argument that allows one to add additional merging functions for specific
    elements.

    The "extra_mappings" arguments takes a hash ref with the same type of structure as described in
    CPAN::Meta::Spec, except with its values as one of the defined merge strategies or a code ref to
    a merging function.

      my $merger = CPAN::Meta::Merge->new(
          default_version => '2',
          extra_mappings => {
              'optional_features' => \&custom_merge_function,
              'x_custom' => 'set_addition',
              'x_meta_meta' => {
                  name => 'identical',
                  tags => 'set_addition',
              }
          }
      );

  merge(@fragments)
    Merge all @fragments together. It will accept both CPAN::Meta objects and (possibly incomplete)
    hashrefs of metadata.

MERGE STRATEGIES
    "merge" uses various strategies to combine different elements of the CPAN::Meta objects. The
    following strategies can be used with the extra_mappings argument of "new":

    identical
        The elements must be identical

    set_addition
        The union of two array refs

          [ a, b ] U [ a, c]  = [ a, b, c ]

    uniq_map
        Key value pairs from the right hash are merged to the left hash. Key collisions are only
        allowed if their values are the same. This merge function will recurse into nested hash refs
        following the same merge rules.

    improvise
        This merge strategy will try to pick the appropriate predefined strategy based on what
        element type. Array refs will try to use the "set_addition" strategy, Hash refs will try to
        use the "uniq_map" strategy, and everything else will try the "identical" strategy.

AUTHORS
    *   David Golden <dagolden AT cpan.org>

    *   Ricardo Signes <rjbs AT cpan.org>

    *   Adam Kennedy <adamk AT cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2010 by David Golden, Ricardo Signes, Adam Kennedy and
    Contributors.

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