CPAN::Meta::Merge - Merging CPAN Meta fragments
version 2.150010
my $merger = CPAN::Meta::Merge->new(default_version => "2");
my $meta = $merger->merge($base, @additional);
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 the CPAN::Meta::Spec manpage, 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 all @fragments together. It will accept both CPAN::Meta objects and
(possibly incomplete) hashrefs of metadata.
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.
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.
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