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my %license_urls = (
    perl         => 'http://dev.perl.org/licenses/',
    apache       => 'http://apache.org/licenses/LICENSE-2.0',
    apache_1_1   => 'http://apache.org/licenses/LICENSE-1.1',
    artistic     => 'http://opensource.org/licenses/artistic-license.php',
    artistic_2   => 'http://opensource.org/licenses/artistic-license-2.0.php',
    lgpl         => 'http://opensource.org/licenses/lgpl-license.php',
    lgpl2        => 'http://opensource.org/licenses/lgpl-2.1.php',
    lgpl3        => 'http://opensource.org/licenses/lgpl-3.0.html',
    bsd          => 'http://opensource.org/licenses/bsd-license.php',
    gpl          => 'http://opensource.org/licenses/gpl-license.php',
    gpl2         => 'http://opensource.org/licenses/gpl-2.0.php',
    gpl3         => 'http://opensource.org/licenses/gpl-3.0.html',
    mit          => 'http://opensource.org/licenses/mit-license.php',
    mozilla      => 'http://opensource.org/licenses/mozilla1.1.php',
    open_source  => undef,
    unrestricted => undef,
    restrictive  => undef,
    unknown      => undef,
);

sub license {
	my $self = shift;
	return $self->{values}->{license} unless @_;
	my $license = shift or die(
		'Did not provide a value to license()'
	);
	$license = __extract_license($license) || lc $license;
	$self->{values}->{license} = $license;

	# Automatically fill in license URLs
	if ( $license_urls{$license} ) {
		$self->resources( license => $license_urls{$license} );
	}

	return 1;
}

sub _extract_license {
	my $pod = shift;
	my $matched;
	return __extract_license(
		($matched) = $pod =~ m/
			(=head \d \s+ L(?i:ICEN[CS]E|ICENSING)\b.*?)
			(=head \d.*|=cut.*|)\z
		/xms
	) || __extract_license(
		($matched) = $pod =~ m/
			(=head \d \s+ (?:C(?i:OPYRIGHTS?)|L(?i:EGAL))\b.*?)
			(=head \d.*|=cut.*|)\z
		/xms
	);
}

sub __extract_license {
	my $license_text = shift or return;
	my @phrases      = (
		'(?:under )?the same (?:terms|license) as (?:perl|the perl (?:\d )?programming language)' => 'perl', 1,
		'(?:under )?the terms of (?:perl|the perl programming language) itself' => 'perl', 1,
		'Artistic and GPL'                   => 'perl',         1,
		'GNU general public license'         => 'gpl',          1,
		'GNU public license'                 => 'gpl',          1,
		'GNU lesser general public license'  => 'lgpl',         1,
		'GNU lesser public license'          => 'lgpl',         1,
		'GNU library general public license' => 'lgpl',         1,
		'GNU library public license'         => 'lgpl',         1,
		'GNU Free Documentation license'     => 'unrestricted', 1,
		'GNU Affero General Public License'  => 'open_source',  1,
		'(?:Free)?BSD license'               => 'bsd',          1,
		'Artistic license 2\.0'              => 'artistic_2',   1,
		'Artistic license'                   => 'artistic',     1,
		'Apache (?:Software )?license'       => 'apache',       1,
		'GPL'                                => 'gpl',          1,
		'LGPL'                               => 'lgpl',         1,
		'BSD'                                => 'bsd',          1,
		'Artistic'                           => 'artistic',     1,
		'MIT'                                => 'mit',          1,
		'Mozilla Public License'             => 'mozilla',      1,
		'Q Public License'                   => 'open_source',  1,
		'OpenSSL License'                    => 'unrestricted', 1,
		'SSLeay License'                     => 'unrestricted', 1,
		'zlib License'                       => 'open_source',  1,
		'proprietary'                        => 'proprietary',  0,
	);
	while ( my ($pattern, $license, $osi) = splice(@phrases, 0, 3) ) {
		$pattern =~ s#\s+#\\s+#gs;
		if ( $license_text =~ /\b$pattern\b/i ) {
			return $license;
		}
	}
	return '';
}

sub license_from {
	my $self = shift;
	if (my $license=_extract_license(Module::Install::_read($_[0]))) {
		$self->license($license);
	} else {
		warn "Cannot determine license info from $_[0]\n";
		return 'unknown';
	}
}

sub _extract_bugtracker {
	my @links   = $_[0] =~ m#L<(
	 https?\Q://rt.cpan.org/\E[^>]+|
	 https?\Q://github.com/\E[\w_]+/[\w_]+/issues|
	 https?\Q://code.google.com/p/\E[\w_\-]+/issues/list
	 )>#gx;
	my %links;
	@links{@links}=();
	@links=keys %links;
	return @links;
}

sub bugtracker_from {
	my $self    = shift;
	my $content = Module::Install::_read($_[0]);
	my @links   = _extract_bugtracker($content);
	unless ( @links ) {
		warn "Cannot determine bugtracker info from $_[0]\n";
		return 0;
	}
	if ( @links > 1 ) {
		warn "Found more than one bugtracker link in $_[0]\n";
		return 0;