# ex:ts=8 sw=4:
# $OpenBSD: PackageName.pm,v 1.9 2005/08/29 00:42:58 espie Exp $
#
# Copyright (c) 2003-2004 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use strict;
use warnings;
package OpenBSD::PackageName;

sub url2pkgname($)
{
	my $name = $_[0];
	$name =~ s|.*/||;
	$name =~ s|\.tgz$||;

	return $name;
}

# see package-specs(7)
sub splitname
{
	local $_ = shift;
	if (/\-(?=\d)/) {
		my $stem = $`;
		my $rest = $';
		my @all = split /\-/, $rest;
		return ($stem, @all);
	} else {
		return ($_);
	}
}

sub splitstem
{
	return (splitname $_[0])[0];
}

sub is_stem
{
	local $_ = shift;
	if (m/\-\d/) {
		return 0;
	} else {
		return 1;
	}
}

sub splitp
{
	local $_ = shift;

	if (/^(.*\-\d[^-]*)p(\d+)/) {
		return ($1.$', $2);
	} else {
		return ($_,-1);
	}
}

sub rebuildp
{
	my ($pkg, $p) = @_;
	if ($p == -1) {
		return $pkg;
	}
	if ($pkg =~ m/\-\d[^-]*/) {
		return "$`$&p$p$'";
	} else {
		return $pkg."p".$p;
	}
}

sub keep_most_recent
{
	my $h = {};
	for my $pkgname (@_) {
		my ($p, $v) = splitp($pkgname);
		if (!defined $h->{$p} || $h->{$p} < $v) {
			$h->{$p} = $v;
		}
	}
	my @list = ();
	while (my ($p, $v) = each %$h) {
		push(@list, rebuildp($p, $v));
	}
	return @list;
}

sub findstem
{
	my ($k, @list) = @_;
	my @r = ();
	for my $n (@list) {
		my $stem = splitstem($n);
		if ($k eq $stem) {
			push(@r, $n);
		}
	}
	return @r;
}

sub compile_stemlist
{
	my $hash = {};
	for my $n (@_) {
		my $stem = splitstem($n);
		$hash->{$stem} = {} unless defined $hash->{$stem};
		$hash->{$stem}->{$n} = 1;
	}
	bless $hash, "OpenBSD::PackageLocator::_compiled_stemlist";
}

package OpenBSD::PackageLocator::_compiled_stemlist;

sub findstem
{
	my ($self, $stem) = @_;
	return keys %{$self->{$stem}};
}
	
1;
