# CPAN::Distroprefs - - read and match distroprefs - perldoc - [phpMan]

## NAME
    [CPAN::Distroprefs](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs/markdown) -- read and match distroprefs

## SYNOPSIS
        use [CPAN::Distroprefs](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs/markdown);

        my %info = (... distribution/environment info ...);

        my $finder = [CPAN::Distroprefs](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs/markdown)->find($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;
                }
            }
        }

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

## INTERFACE
        my $finder = [CPAN::Distroprefs](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs/markdown)->find($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](https://www.chedong.com/phpMan.php/perldoc/YAML%3A%3ASyck/markdown)',
            'dd'  => '[Data::Dumper](https://www.chedong.com/phpMan.php/perldoc/Data%3A%3ADumper/markdown)',
            ...
        }

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

    *   a [CPAN::Distroprefs::Result](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs%3A%3AResult/markdown) object

    *   "undef", indicating that no prefs files remain to be found

## RESULTS
### find
    prefs file.

### Common
    All results share some common attributes:

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

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

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

   dir
    the directory the file was read from

   abs
    the absolute path to the file

### Errors
    Error results (warning and fatal) contain:

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

### Successes
    Success results contain:

   prefs
    an arrayref of [CPAN::Distroprefs::Pref](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs%3A%3APref/markdown) objects

## PREFS
    [CPAN::Distroprefs::Pref](https://www.chedong.com/phpMan.php/perldoc/CPAN%3A%3ADistroprefs%3A%3APref/markdown) objects represent individual distroprefs documents. They are constructed
    automatically as part of "success" results from find().

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

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

    currently: "env perl perlconfig distribution module"

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

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

   matches
      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)

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