NAME
   Config::Onion - Layered configuration, because configs are like ogres

VERSION
   version 1.000

SYNOPSIS
     my $cfg = Config::Onion->new;
     my $cfg = Config::Onion->set_default(db => {name => 'foo', password => 'bar'});
     my $cfg = Config::Onion->load('/etc/myapp', './myapp');
     my $cfg = Config::Onion->load_glob('./plugins/*');

     $cfg->set_default(font => 'Comic Sans');
     $cfg->load('config');
     $cfg->load_glob('conf.d/myapp*');
     $cfg->set_override(font => 'Arial');

     my $dbname = $cfg->get->{db}{name};
     my $plain_hashref_conf = $cfg->get;
     my $dbpassword = $plain_hashref_conf->{db}{password};

DESCRIPTION
   All too often, configuration is not a universal or one-time thing, yet
   most configuration-handling treats it as such. Perhaps you can only load
   one config file. If you can load more than one, you often have to load
   all of them at the same time or each is stored completely independently,
   preventing one from being able to override another. Config::Onion
   changes that.

   Config::Onion stores all configuration settings in four layers:
   Defaults, Main, Local, and Override. Each layer can be added to as many
   times as you like. Within each layer, settings which are given multiple
   times will take the last specified value, while those which are not
   repeated will remain untouched.

     $cfg->set_default(name => 'Arthur Dent', location => 'Earth');
     $cfg->set_default(location => 'Magrathea');
     # In the Default layer, 'name' is still 'Arthur Dent', but 'location' has
     # been changed to 'Magrathea'.

   Regardless of the order in which they are set, values in Main will
   always override values in the Default layer, the Local layer always
   overrides both Default and Main, and the Override layer overrides all
   the others.

   The design intent for each layer is:

   *   Default

       Hardcoded default values to be used when no further configuration is
       present

   *   Main

       Values loaded from standard configuration files shipped with the
       application

   *   Local

       Values loaded from local configuration files which are kept separate
       to prevent them from being overwritten by application upgrades, etc.

   *   Override

       Settings provided at run-time which take precendence over all
       configuration files, such as settings provided via command line
       switches

METHODS
 new
   Returns a new, empty configuration object.

 load(@file_stems)
   Loads files matching the given stems using "Config::Any->load_stems"
   into the Main layer. Also concatenates ".local" to each stem and loads
   matching files into the Local layer. e.g., "$cfg->load('myapp')" would
   load "myapp.yml" into Main and "myapp.local.js" into Local. All filename
   extensions supported by "Config::Any" are recognized along with their
   corresponding formats.

 load_glob(@globs)
   Uses the Perl "glob" function to expand each parameter into a list of
   filenames and loads each file using "Config::Any". Files whose names
   contain the string ".local." are loaded into the Local layer. All other
   files are loaded into the Main layer.

 set_default([\%settings,...,] %settings)
 set_override([\%settings,...,] %settings)
   Imports %settings into the Default or Override layer. Accepts settings
   both as a plain hash and as hash references, but, if the two are mixed,
   all hash references must appear at the beginning of the parameter list,
   before any non-hashref settings.

PROPERTIES
 cfg
 get
   Returns the complete configuration as a hash reference.

 default
 main
 local
 override
   These properties each return a single layer of the configuration. This
   is not likely to be useful other than for debugging. For most other
   purposes, you probably want to use "get" instead.

BUGS AND LIMITATIONS
   No bugs have been reported.

   Please report any bugs or feature requests at
   <https://github.com/dsheroh/Config-Onion/issues>

AUTHOR
   Dave Sherohman <[email protected]>

COPYRIGHT AND LICENSE
   This software is copyright (c) 2013 by Lund University Library.

   This is free software; you can redistribute it and/or modify it under
   the same terms as the Perl 5 programming language system itself.

POD ERRORS
   Hey! The above document had some coding errors, which are explained
   below:

   Around line 168:
       You forgot a '=back' before '=head1'

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