#!/usr/bin/ruby
#
# diffdeb - Diff between Debian Packages/Sources.gz
#
# Usage: diffdeb <old> <new>
#
# diffdeb compares two Packages.gz files and prints packages
# which are only in new Packages (also can be used for Sources.gz).
#
# Copyright (C) 2002  Masato Taruishi <taru@debian.org>
#
#  This program 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 of the License, or
#  (at your option) any later version.
#
#  This program 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 with
#  the Debian GNU/Linux distribution in file /usr/share/common-licenses/GPL;
#  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
#  Suite 330, Boston, MA  02111-1307  USA

require 'zlib'

def each (file, &block)
  fin = GzipReader.open(file)
  fin.each do |line|
    yield line
  end
  fin.close
end

if ARGV.size != 2
  $stderr.puts "Usage: #{__FILE__} <old> <new>"
  exit 1
end

$old = ARGV.shift
$new = ARGV.shift

old = {}

pkg = nil
ver = nil
each ($old) do |line|
  case line
  when /\AVersion: (.*)/
    ver = $1
  when /\APackage: (.*)/
    pkg = $1
  when "\n"
    old[pkg + "_" + ver] = 1
  end
end

str = ""
each ($new) do |line|
  str << line
  case line
  when /\AVersion: (.*)/
    ver = $1
  when /\APackage: (.*)/
    pkg = $1
  when "\n"
    puts str unless old.include?(pkg + "_" + ver)
    str = ""
  end
end
