Module::CPANfile(3) 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

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