Config::Tree::Env - Read configuration tree from environment variables

 # in Bash-like shell:

 % CONFIG_FOO__BAR=3 perl script.pl
 % CONFIG_FOO='{bar: 3}' perl script.pl; # same thing

 # in script.pl:

 use Config::Tree::Env;

 my $conf = Config::Tree::Env->new(
     # schema => ...,
     # include_path_re => qr/.../,
     # exclude_path_re => qr/.../,
     # env_path_separator => '__',
     # env_prefix => 'CONFIG_',
     # env_lowercase => 1,
     # env_as_yaml => 1,
     ro    => 0,
 );
 my $val = $conf->get('/foo/bar'); # 3
 $conf->cd('/foo');
 $conf->set('bar', 10); # same as set('/foo/bar', 10);

This module, CT::Env, construct config tree from environment variables. By default, only config variables beginning with CONFIG_ will be parsed (can be changed with env_prefix property). By default, __ in environment variable's names will be regarded as path separator (can be changed with env_path_separator property). Also, by default, environment variable's name will be converted to lowercase (can be prevented by setting env_lowercase property to 0). So, environment variable CONFIG_FOO__BAR will become /foo/bar while CONFIG_FOO_BAR will become /foo_bar and FOO_BAR will be ignored.

Construct a new Config::Tree::Env object. Arguments.

• exclude_path_re. Optional. When set, config path matching the regex will not be retrieved. See also: include_path_re.
• include_path_re. Optional. When set, only config path matching the regex will be retrieved. Takes precedence over exclude_path_re.
• schema. Optional. When specified, after the tree is retrieved, it will be validated against this schema using Data::Schema.
• env_path_separator. Optional. What string to assume as path separator. Default is __ (two underscores). If you do not want path splitting, set this to empty string.
• env_prefix. Optional. Default is CONFIG_. What string to use as prefix. Only variables matching the prefix will be parsed. Setting this to empty string means all environment variables will be parsed and imported into config tree!
• env_lowercase. Optional. Whether to convert environment variable's name to lowercase. Default is 1.
• env_as_yaml. Optional. Whether to assume environment variable's value as YAML. Default is 1.

Does nothing.

Does nothing.

Data::Schema, Config::Tree::Base

Steven Haryanto, <stevenharyanto at gmail.com>

Copyright 2009 Steven Haryanto, all rights reserved.

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