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@cpan.org>

       •   Ricardo Signes <rjbs@cpan.org>

       •   Adam Kennedy <adamk@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 v5.38.2                                       2025-04-08                           CPAN::Meta::Merge(3perl)