#!/usr/bin/perl -w
#
# Copyright (c) 2002 Nik Clayton
# 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.
#
# $Id$
#

use strict;
use GraphViz;

my $g = GraphViz->new(concentrate => 1,
		      rankdir => 1,
		      node => {shape => 'box'});

my $pkg = shift;
$pkg =~ s|^/var/db/pkg/||;	# Trim off the directory name
$pkg =~ s|/$||;			# Trim off trailing slash

my %seen = ();			# Keep track of already seen packages

depends($pkg);

sub depends {
    my $this_pkg = shift;

    return if $seen{$this_pkg};	# Bottom out the recursion
    $seen{$this_pkg}++;

    $g->add_node($this_pkg);
    open(F, "/var/db/pkg/$this_pkg/+CONTENTS") or die "open(): $!\n";
    foreach(<F>) {
	# Skip non pkgdep lines.  If we have found one then $1 will 
	# contain the name of the dependency
	next if ! /^\@pkgdep\s+(.*)$/;

	# Add an edge from this package to the dependency
	$g->add_edge($this_pkg => $1);

	# Recurse, doing the same thing for the dependency
	depends($1);
    }
    close(F);
}

print $g->as_png();
