0.02, use default configfile

[gitmo/MooseX-ConfigFromFile.git] / README

NAME
    MooseX::ConfigFromFile - An abstract Moose role for setting attributes
    from a configfile

SYNOPSIS
      ########
      ## A real role based on this abstract role:
      ########

      package MooseX::SomeSpecificConfigRole;
      use Moose::Role;
      
  with 'MooseX::ConfigFromFile';
      
  use Some::ConfigFile::Loader ();

      sub get_config_from_file {
        my ($class, $file) = @_;

        my $options_hashref = Some::ConfigFile::Loader->load($file);

        return $options_hashref;
      }


      ########
      ## A class that uses it:
      ########
      package Foo;
      use Moose;
      with 'MooseX::SomeSpecificConfigRole';

      # optionally, default the configfile:
      has +configfile ( default => '/tmp/foo.yaml' );

      # ... insert your stuff here ...

      ########
      ## A script that uses the class with a configfile
      ########

      my $obj = Foo->new_with_config(configfile => '/etc/foo.yaml', other_opt => 'foo');

DESCRIPTION
    This is an abstract role which provides an alternate constructor for
    creating objects using parameters passed in from a configuration file.
    The actual implementation of reading the configuration file is left to
    concrete subroles.

    It declares an attribute "configfile" and a class method
    "new_with_config", and requires that concrete roles derived from it
    implement the class method "get_config_from_file".

    Attributes specified directly as arguments to "new_with_config"
    supercede those in the configfile.

    MooseX::Getopt knows about this abstract role, and will use it if
    available to load attributes from the file specified by the commandline
    flag "--configfile" during its normal "new_with_options".

Attributes
  configfile
    This is a Path::Class::File object which can be coerced from a regular
    pathname string. This is the file your attributes are loaded from. You
    can add a default configfile in the class using the role and it will be
    honored at the appropriate time:

      has +configfile ( default => '/etc/myapp.yaml' );

Class Methods
  new_with_config
    This is an alternate constructor, which knows to look for the
    "configfile" option in its arguments and use that to set attributes. It
    is much like MooseX::Getopts's "new_with_options". Example:

      my $foo = SomeClass->new_with_config(configfile => '/etc/foo.yaml');

    Explicit arguments will overide anything set by the configfile.

  get_config_from_file
    This class method is not implemented in this role, but it is required of
    all subroles. Its two arguments are the classname and the configfile,
    and it is expected to return a hashref of arguments to pass to "new()"
    which are sourced from the configfile.

  meta
    The Moose meta stuff, included here because otherwise pod tests fail
    sometimes

BUGS
AUTHOR
    Brandon L. Black, <blblack@gmail.com>

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