File Coverage

blib/lib/Config/ENV.pm

Criterion	Covered	Total	%
statement	88	88	100.0
branch	21	22	95.4
condition	9	10	90.0
subroutine	21	21	100.0
pod	8	8	100.0
total	147	149	98.6

package Config::ENV;

use strict;
use warnings;

use Carp;
use File::Spec;

our $VERSION = '0.17';

sub import {
	my $class   = shift;
	my $package = caller(0);

	no strict 'refs';
	if (__PACKAGE__ eq $class) {
		my $name    = shift;
		my %opts    = @_;

		push @{"$package\::ISA"}, __PACKAGE__;

		for my $method (qw/common config parent load/) {
			*{"$package\::$method"} = \&{__PACKAGE__ . "::" . $method}
		}

		no warnings 'once';
		${"$package\::data"} = +{
			common  => {},
			envs    => {},
			name    => $name,
			default => $opts{default} || 'default',
			export  => $opts{export},
			_local  => [],
		};
	} else {
		my %opts    = @_;
		my $data = _data($class);
		if (my $export = $opts{export} || $data->{export}) {
			*{"$package\::$export"} = sub { $class };
		}
	}
}

sub _data {
	my $package = shift || caller(1);
	no strict 'refs';
	no warnings 'once';
	${"$package\::data"};
}

sub common ($) { ## no critic
	my ($hash) = @_;
	_data->{common} = $hash;
}

sub config ($$) { ## no critic
	my ($name, $hash) = @_;
	_data->{envs}->{$name} = $hash;
	undef _data->{_merged}->{$name};
}

sub load ($) { ## no critic
	my $filename = shift;
	$filename = File::Spec->catfile('.', $filename) unless File::Spec->file_name_is_absolute($filename);
	my $hash = do "$filename";

	croak $@ if $@;
	croak $^E unless defined $hash;
	unless (ref($hash) eq 'HASH') {
		croak "$filename does not return HashRef.";
	}

	wantarray ? %$hash : $hash;
}

sub parent ($) { ## no critic
	my ($name) = @_;
	%{ _data->{envs}->{$name} || {} };
}

sub current {
	my ($package) = @_;
	my $data = _data($package);

	my $vals = $data->{_merged}->{$package->env} ||= +{
		%{ $data->{common} },
		%{ $data->{envs}->{$package->env} || {} },
		(map { %$_ } @{ $data->{_local} }),
	};
}

sub param {
	my ($package, $name) = @_;
	$package->current->{$name};
}

sub local {
	my ($package, %hash) = @_;
	not defined wantarray and croak "local returns guard object; Can't use in void context.";

	my $data = _data($package);
	push @{ $data->{_local} }, \%hash;
	undef $data->{_merged};

	bless sub {
		@{ $data->{_local} } = grep { $_ != \%hash } @{ $data->{_local} };
		undef $data->{_merged};
	}, 'Config::ENV::Local';
}

sub env {
	my ($package) = @_;
	my $data = _data($package);
	$ENV{$data->{name}} || $data->{default};
}

{
	package
		Config::ENV::Local;

	sub DESTROY {
		my $self = shift;
		$self->();
	}
};

1;
__END__