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Manual Reference Pages  -  MODULE::CPANFILE (3)

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NAME

Module::CPANfile - Parse cpanfile

CONTENTS

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::Prereqsas_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 MYMETAs 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 <B>this method will overwrite the existing cpanfile without any warning or backupB>. 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
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perl v5.20.3 MODULE::CPANFILE (3) 2016-02-12

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