Module::CPANfile - Parse cpanfile

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');

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

• 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.

• options_for_module

    my $options = $file->options_for_module($module);
  

  Returns the extra options specified for a given module as a hash reference. Returns undef when the given module is not specified in the cpanfile.

  For example,

    # cpanfile
    requires 'Plack', '1.000',
      dist => "MIYAGAWA/Plack-1.000.tar.gz";
  
    # ...
    my $file = Module::CPANfile->load;
    my $options = $file->options_for_module('Plack');
    # => { dist => "MIYAGAWA/Plack-1.000.tar.gz" }
  

Tatsuhiko Miyagawa

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