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CPAN::Meta::Merge(3)  User Contributed Perl Documentation CPAN::Meta::Merge(3)
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
       o   David Golden <dagolden AT cpan.org>
       o   Ricardo Signes <rjbs AT cpan.org>
       o   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.
perl v5.26.3                      2016-08-18              CPAN::Meta::Merge(3)