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NAME

    Module::CPANfile - Parse cpanfile

SYNOPSIS

      use Module::CPANfile;
    
      my $file = Module::CPANfile->load("cpanfile");
      my $prereqs = $file->prereqs; # CPAN::Meta::Prereqs object
    
      my @features = $file->features; # CPAN::Meta::Feature objects
      my $merged_prereqs = $file->prereqs_with(@identifiers); # CPAN::Meta::Prereqs
    
      $file->merge_meta('MYMETA.json');

DESCRIPTION

    Module::CPANfile is a tool to handle cpanfile format to load
    application specific dependencies, not just for CPAN distributions.

METHODS

    load

        $file = Module::CPANfile->load;
        $file = Module::CPANfile->load('cpanfile');

      Load and parse a cpanfile. By default it tries to load cpanfile in
      the current directory, unless you pass the path to its argument.

    from_prereqs

        $file = Module::CPANfile->from_prereqs({
          runtime => { requires => { DBI => '1.000' } },
        });

      Creates a new Module::CPANfile object from prereqs hash you can get
      via CPAN::Meta's prereqs, or CPAN::Meta::Prereqs' as_string_hash.

        # read MYMETA, then feed the prereqs to create Module::CPANfile
        my $meta = CPAN::Meta->load_file('MYMETA.json');
        my $file = Module::CPANfile->from_prereqs($meta->prereqs);
      
        # load cpanfile, then recreate it with round-trip
        my $file = Module::CPANfile->load('cpanfile');
        $file = Module::CPANfile->from_prereqs($file->prereq_specs);
                                          # or $file->prereqs->as_string_hash

    prereqs

      Returns CPAN::Meta::Prereqs object out of the parsed cpanfile.

    prereq_specs

      Returns a hash reference that should be passed to
      CPAN::Meta::Prereqs->new.

    features

      Returns a list of features available in the cpanfile as
      CPAN::Meta::Feature.

    prereqs_with(@identifiers), effective_prereqs(\@identifiers)

      Returns CPAN::Meta::Prereqs object, with merged prereqs for features
      identified with the @identifiers.

    to_string($include_empty)

        $file->to_string;
        $file->to_string(1);

      Returns a canonical string (code) representation for cpanfile. Useful
      if you want to convert CPAN::Meta::Prereqs to a new cpanfile.

        # read MYMETA's prereqs and print cpanfile representation of it
        my $meta = CPAN::Meta->load_file('MYMETA.json');
        my $file = Module::CPANfile->from_prereqs($meta->prereqs);
        print $file->to_string;

      By default, it omits the phase where there're no modules registered.
      If you pass the argument of a true value, it will print them as well.

    save

        $file->save('cpanfile');

      Saves the currently loaded prereqs as a new cpanfile by calling
      to_string. Beware this method will overwrite the existing cpanfile
      without any warning or backup. Taking a backup or giving warnings to
      users is a caller's responsibility.

        # Read MYMETA.json and creates a new cpanfile
        my $meta = CPAN::Meta->load_file('MYMETA.json');
        my $file = Module::CPANfile->from_prereqs($meta->prereqs);
        $file->save('cpanfile');

    merge_meta

        $file->merge_meta('META.yml');
        $file->merge_meta('MYMETA.json', '2.0');

      Merge the effective prereqs with Meta specification loaded from the
      given META file, using CPAN::Meta. You can specify the META spec
      version in the second argument, which defaults to 1.4 in case the
      given file is YAML, and 2 if it is JSON.

AUTHOR

    Tatsuhiko Miyagawa

SEE ALSO

    cpanfile, CPAN::Meta, CPAN::Meta::Spec