#!/usr/bin/ruby
# Original script
# Copyright (C) 2004 by Crossbow/Miyo <miyo@iki.fi>
# Some features and Ruby-fication
# Copyright (C) 2005 by Isaac Clerencia <isaac@warp.es>
# Part of the Battle for Wesnoth Project http://www.wesnoth.org
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY.
#
# See the COPYING file for more details.

require 'md5'

def sha1sum(file)
	MD5.new(open(file).read).hexdigest
end

checkOld = true

totalSavedBytes = 0
totalSavedFiles = 0

files = (`find -iname "*.png"`).split("\n")

files.each { | file| 
	file = file[2,file.length]
	puts "\n* processing #{file}\n"

	old = "/home/isaac/devel/wesnoth/last/#{file}";
	if checkOld and File.exists?(old) and sha1sum(file) == sha1sum(old)
		puts "  * no change since last release\n";
		next;
	end
	output = `nice -n 19 pngrewrite "#{file}" "#{file}.new"`;
	File.exists?("#{file}.new") or next;
	oldSize = File.size(file)
	newSize = File.size("#{file}.new")
	if newSize < oldSize
		savedBytes = oldSize - newSize;
		totalSavedBytes = totalSavedBytes + savedBytes
		totalSavedFiles = totalSavedFiles.succ
		output = `mv "#{file}.new" -v "#{file}"`
		puts ", $output,\nsaved: #{savedBytes} bytes, total saved: #{totalSavedBytes/1024} KB"
	else
		File.unlink("#{file}.new");
	end
}

puts "\ntotal saved: #{totalSavedBytes/1024} KB, #{totalSavedFiles} files\n";