#!/usr/bin/perl -w
#
# Copyright (c) 2000 Neil Blakey-Milner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

# a script to gain a bit of knowledge about a supplied distfile

use strict;
use vars qw/ $opt_n /;

use File::Basename qw( basename dirname );
use Getopt::Std qw( getopts );

my ($filename, $ver, $initdir, $distdir, $wrkdir, $tmpdir);
my ($makefile, $wrksrc);
my (%cap);

chomp($initdir = `pwd`);

$cap{"MAINTAINER"} = ($ENV{"MAINTAINER"} || $ENV{"PKGMAINTAINER"} || "ports\@freebsd.org");

getopts('n');

&usage if $#ARGV != 0;

$filename = $ARGV[0];

if ($filename =~ m#^(f|ht)tp\://#) {
	print `fetch $filename`;
	$cap{"MASTER_SITES"} = dirname($filename) . '/';
	$filename = basename($filename);
}
chdir(dirname($filename));
chomp($distdir = `pwd`);
chdir ($initdir);

&chk_extract; # .tar.gz vs .tgz vs .tar.bz2, &c.
&enh_distname;
if ($opt_n) {
	print "filename is $filename\n";
	print "PORTNAME is " . $cap{"PORTNAME"} . "\n";
	print "PORTVERSION is " . $cap{"PORTVERSION"} . "\n";
	exit;
}
&bareskel;
&md5;
&writemk;

exit;

sub bareskel {
	$tmpdir = $cap{'PORTNAME'};
	$tmpdir .= ".$$" while -e $tmpdir;
	mkdir($tmpdir,0777);

	`printf "\n" > $tmpdir/pkg-plist`;
	`printf "\n" > $tmpdir/pkg-descr`;
}

sub writemk {

	my (%tmp);
	my ($key);

	my ($distname);
	$distname = $cap{"PORTNAME"};

	foreach $key (keys %cap) {
		$tmp{$key} = $cap{$key};
	}

	open(MAKEFILE, ">$tmpdir/Makefile");
	my ($date);
	chomp($date = `date +"\%d \%b \%Y"`);

	print MAKEFILE <<EOF;
# New ports collection makefile for: $distname
# Date created:		$date
# Whom:			makeport.pl
#
# \$FreeBSD\$
#

EOF

	print MAKEFILE "PORTNAME=	" . $tmp{"PORTNAME"} . "\n";
	print MAKEFILE "PORTVERSION=	" . $tmp{"PORTVERSION"} . "\n";
	delete($tmp{"PORTNAME"});
	delete($tmp{"PORTVERSION"});

	print MAKEFILE "CATEGORIES=	misc\n";
	foreach $key (keys %tmp) {
		my($tmp) = $tmp{$key};
		if (($key eq "DISTNAME") || ($key eq "EXTRACT_SUFX")) {
			print MAKEFILE "$key=\t$tmp\n";
			delete($tmp{$key});
		}
	}

	if ($tmp{"MASTER_SITES"}) {
		print MAKEFILE "MASTER_SITES= 	". $tmp{"MASTER_SITES"} . "\n\n";
		delete($tmp{"MASTER_SITES"});
	}

	print MAKEFILE "\nMAINTAINER=\t" . $tmp{"MAINTAINER"} . "\n";
	delete($tmp{"MAINTAINER"});
	print MAKEFILE "COMMENT=\t" . "A" . "\n\n";

	if ($tmp{"LIB_DEPENDS"}) {
		print MAKEFILE "LIB_DEPENDS=". $tmp{"LIB_DEPENDS"} . "\n\n";
		delete($tmp{"LIB_DEPENDS"});
	}

	#second group
	foreach $key (keys %tmp) {
		my($tmp) = $tmp{$key};
		print MAKEFILE "$key=\t$tmp\n";
	}

	print MAKEFILE "# -- eos --\n\n";

	print MAKEFILE ".include <bsd.port.mk>\n";	
	close (MAKEFILE);
}

sub md5 {
	my $tmp = basename($filename);
	chdir ($initdir);
	`md5 $filename | perl -pe "s#$filename#$tmp#" > $tmpdir/distinfo`;
}

sub chk_extract {
	my $tmp = basename($filename);

	$tmp =~ s/(\.tgz)$// && do {
		$cap{"DISTNAME"} = $tmp;
		$cap{"EXTRACT_SUFX"} = $1;
		return;
	};
	$tmp =~ s/(\.tar\.bz2)$// && do {
		$cap{"DISTNAME"} = $tmp;
		$cap{"EXTRACT_SUFX"} = $1 if ($1 ne ".tar.bz2");
		$cap{"USE_BZIP2"} = "YES";
		return;
	};
	$tmp =~ s/(\.tar)$// && do {
		$cap{"DISTNAME"} = $tmp;
		$cap{"EXTRACT_SUFX"} = $1;
		return;
	};
	$tmp =~ s/(\.tar.*)$// && do {
		$cap{"DISTNAME"} = $tmp;
		$cap{"EXTRACT_SUFX"} = $1 if ($1 ne ".tar.gz");
		return;
	};
}

sub add_extsuffix {
	return if $cap{"EXTRACT_SUFX"};
	if ($cap{"USE_BZIP2"}) {
		$cap{"EXTRACT_SUFX"} = ".tar.bz2";
	} else {
		$cap{"EXTRACT_SUFX"} = ".tar.gz";
	}
}

sub enh_distname {
	my($changes) = 0;
	my($play) = $cap{"DISTNAME"};
	#print "starting play...\n";
	my($firstshot) = 0;
	my($portname, $portversion);
	if (defined($play) eq "") {
		die "can't make heads or tails of $filename";
	}
	while ($changes == 0) {
		$changes = 1;
		$firstshot++;
		$_ = $play;
		#print "using $play\n";
		/^(.*[0-9][a-z]?)([-._][a-z]*)$/i && do {
			print "Door #1\n";
			$cap{"DISTNAME"} = $1;
			$play = $1;
			&add_extsuffix;
			$cap{"EXTRACT_SUFX"} = $2 . $cap{"EXTRACT_SUFX"};
			$changes = 0;
			next;
		};
		/^([a-z]*)([0-9]+)([-._])([0-9]+([-._]).*)$/i && do {
			print "Door #2\n";
			if ($5 eq $3) {
				$play = "$1-$2.$4";
				#$cap{"PORTNAME"} = $1;
				#$cap{"PORTVERSION"} = "$2.$4";
				$portname = $1;
				$portversion = "$2.$4";
				$changes = 0;
				next;
			}
		};
		/^(.*?[^-._])([0-9])([-._])([^v]?[0-9]*[a-z]*)([-._]?)(.*)$/i &&( $firstshot == 1) && do {
			print "Door #4\n";
			if (($5 eq $3) || ($5 eq "")) {
				#$cap{"PORTNAME"} = $1;
				#$cap{"PORTVERSION"} = "$2$3$4$5$6";
				$portname = $1;
				$portversion = "$2$3$4$5$6";
				next;
			}
		};
		/^(.*?)([-._])(v?)((?:[0-9][-._])*[0-9][a-z]?.*)$/i && do {
			print "Door #3\n";
			my($tmp);
			$tmp = $1;
			$ver = "$4";
			if ($ver =~ /^(.*)([-._])([0-9]?)([a-z])[a-z]+([0-9]?)$/) {
				print "Door #3.1\n";
				my($foo) = "";
				#print "1 - $1\n";
				#print "2 - $2\n";
				#print "3 - $3\n";
				#print "4 - $4\n";
				#print "5 - $5\n";
				$foo = "." if $2;
				#$ver = "$1$foo$3$4$5";
				$ver = "$1$foo$3$4$5";
			}
			$portname = $tmp;
			$portversion = $ver;
			next;
		};
	}

	if (defined($portversion) eq "") {
		die "can't make heads or tails of $filename";
	}

	$portversion =~ s/_/./g;
	$portversion =~ s/-/./g;

	$cap{"PORTNAME"} = $portname;
	$cap{"PORTVERSION"} = $portversion;
		
	my ($temp1);
	my ($temp2);

	$temp1 = $cap{"DISTNAME"};
	$temp2 = $cap{"PORTNAME"} . "-" . $cap{"PORTVERSION"};

	if ($temp1 eq $temp2) {
		delete($cap{"DISTNAME"});
	}
}

sub usage {
	print STDERR <<"EOF";
usage: $0 filename

	generates a ports skeleton for port based on filename

EOF
	exit;
}