CPAN::Distroprefs(3p) Perl Programmers Reference Guide CPAN::Distroprefs(3p)

CPAN::Distroprefs -- read and match distroprefs

    use CPAN::Distroprefs;
    my %info = (... distribution/environment info ...);
    my $finder = CPAN::Distroprefs->find($prefs_dir, \%ext_map);
    while (my $result = $finder->next) {
        die $result->as_string if $result->is_fatal;
        warn($result->as_string), next if $result->is_warning;
        for my $pref (@{ $result->prefs }) {
            if ($pref->matches(\%info)) {
                return $pref;

This module encapsulates reading Distroprefs and matching them against CPAN distributions.

    my $finder = CPAN::Distroprefs->find($dir, \%ext_map);
    while (my $result = $finder->next) { ... }

Build an iterator which finds distroprefs files in the tree below the given directory. Within the tree directories matching "m/^[._]/" are pruned.

%ext_map is a hashref whose keys are file extensions and whose values are modules used to load matching files:

        'yml' => 'YAML::Syck',
        'dd'  => 'Data::Dumper',

Each time "$finder->next" is called, the iterator returns one of two possible values:

  • a CPAN::Distroprefs::Result object
  • "undef", indicating that no prefs files remain to be found

"find()" returns CPAN::Distroprefs::Result objects to indicate success or failure when reading a prefs file.

All results share some common attributes:


"success", "warning", or "fatal"


the file from which these prefs were read, or to which this error refers (relative filename)


the file's extension, which determines how to load it


the directory the file was read from


the absolute path to the file

Error results (warning and fatal) contain:


the error message (usually either $! or a YAML error)

Success results contain:


an arrayref of CPAN::Distroprefs::Pref objects

CPAN::Distroprefs::Pref objects represent individual distroprefs documents. They are constructed automatically as part of "success" results from "find()".


the pref information as a hashref, suitable for e.g. passing to Kwalify


returns a list of the valid match attributes (see the Distroprefs section in CPAN)

currently: "env perl perlconfig distribution module"


true if this pref has a 'match' attribute at all


true if this pref has a 'match' attribute and at least one valid match attribute


  if ($pref->matches(\%arg)) { ... }

true if this pref matches the passed-in hashref, which must have a value for each of the "match_attributes" (above)

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2017-02-05 perl v5.36.3