# NAME MooX::Attribute::ENV - Allow Moo attributes to get their values from %ENV # PROJECT STATUS | OS | Build status | |:-------:|--------------:| | Linux | [![Build Status](https://travis-ci.org/mohawk2/moox-attribute-env.svg?branch=master)](https://travis-ci.org/mohawk2/moox-attribute-env) | [![CPAN version](https://badge.fury.io/pl/moox-attribute-env.svg)](https://metacpan.org/pod/MooX::Attribute::ENV) [![Coverage Status](https://coveralls.io/repos/github/mohawk2/moox-attribute-env/badge.svg?branch=master)](https://coveralls.io/github/mohawk2/moox-attribute-env?branch=master) # SYNOPSIS package MyMod; use Moo; use MooX::Attribute::ENV; # look for $ENV{attr_val} and $ENV{ATTR_VAL} has attr => ( is => 'ro', env_key => 'attr_val', ); # look for $ENV{attr_val} and $ENV{next_val}, in that order has some => ( is => 'ro', env_key => [ 'attr_val', 'next_val' ], ); # looks for $ENV{otherattr} and $ENV{OTHERATTR}, then any default has otherattr => ( is => 'ro', env => 1, default => 7, ); # looks for $ENV{xxx_prefixattr} and $ENV{XXX_PREFIXATTR} has prefixattr => ( is => 'ro', env_prefix => 'xxx', ); # looks for $ENV{MyMod_packageattr} and $ENV{MYMOD_PACKAGEATTR} has packageattr => ( is => 'ro', env_package_prefix => 1, ); $ perl -MMyMod -E 'say MyMod->new(attr => 2)->attr' # 2 $ ATTR_VAL=3 perl -MMyMod -E 'say MyMod->new->attr' # 3 $ OTHERATTR=4 perl -MMyMod -E 'say MyMod->new->otherattr' # 4 # DESCRIPTION This is a [Moo](https://metacpan.org/pod/Moo) extension. It allows other attributes for ["has" in Moo](https://metacpan.org/pod/Moo#has). If any of these are given, then ["BUILDARGS" in Moo](https://metacpan.org/pod/Moo#BUILDARGS) is wrapped so that values for object attributes can, if not supplied in the normal construction process, come from the environment. The environment will be searched for either the given case, or upper case, version of the names discussed below. When a prefix is mentioned, it will be prepended to the mentioned name, with a `_` in between. # ADDITIONAL ATTRIBUTES ## env Boolean. If true, the name is the attribute, no prefix. ## env\_key String. If true, the name is the given value, no prefix. or ArrayRef. A list of names that will be checked in given order. ## env\_prefix String. The prefix is the given value. ## env\_package\_prefix Boolean. If true, use as the prefix the current package-name, with `::` replaced with `_`. # AUTHOR Ed J, porting John Napiorkowski's excellent [MooseX::Attribute::ENV](https://metacpan.org/pod/MooseX%3A%3AAttribute%3A%3AENV). # LICENCE The same terms as Perl itself.