#!/usr/bin/perl

# Copyright (C) 2004 Stéphane Levant <sun@tuxfamily.org>

# This file is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with GNU Emacs; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

# Affiche les différences entre deux /var/lib/dpkg/status

use strict;

sub read_dpkg {
    my ($file) = @_;
    my $src = *STDIN;
    if ($file ne "-") {
	$src = *SRC;
	open ($src, $file);
    }
    my %t;
    my $pack = "";
    while (<$src>) {
	$pack = $1 if (/^Package: (.+)$/);
	if (/^Status: (.+)$/) {
	    if ($1 ne "install ok installed") {
		$pack = "";
	    }
	}
	if (/^Description: (.*)$/ && $pack ne "") {
	    $t{$pack} = $1;
	}
    }
    if ($file ne "-") {
	close ($src);
    }
    return %t;
}

my %loc = read_dpkg ("/var/lib/dpkg/status");
my %arg = read_dpkg (@ARGV[0]);

foreach my $i (sort keys %loc) {
    if (! $arg{$i}) {
	printf ("< %-25s %s\n", $i, $loc{$i});
    }
}
print "\n";
foreach my $i (sort keys %arg) {
    if (! $loc{$i}) {
	printf ("> %-25s %s\n", $i, $arg{$i});
    }
}