#!/usr/bin/env python
# -*- coding: iso-8859-2 -*-
# $Id$
# 
# Make or compare list of files
#
# Author: Wojciech Muła
# e-mail: wojciech_mula@poczta.onet.pl
# www:    http://0x80.pl/
#
# License: public domain

import os
import os.path
import hashlib
import sys

from os.path import join, getsize

def main(args):
	def arg(index, default=None):
		try:
			return args[index]
		except IndexError:
			if default is not None:
				return default
			else:
				help()
				sys.exit(1)

	action = arg(1)
	if action in ['make', 'list', 'ls']:
		make_list(arg(2), sys.stdout)
	elif action in ['cmp', 'compare']:
		path1 = arg(2)
		path2 = arg(3)

		list1 = open(path1, 'r').readlines()
		list2 = open(path2, 'r').readlines()
		compare(list1, list2, arg(4, ''), sys.stdout)
	else:
		sys.stderr.write("Unknown action '%s'\n" % action)
		help()


def make_list(root_directory, out):
	root_directory = os.path.normpath(os.path.abspath(root_directory))
	n = len(root_directory)

	for root, dirs, files in os.walk(root_directory):
		for file in files:
			path = join(root, file)
			s = "%s %10d %s\n" % (getmd5sum(path), getsize(path), path[n:])
			out.write(s)
	pass


def compare(list1, list2, prefix, out):
	for line in set(list1) - set(list2):
		s = prefix + line.split()[2]
		out.write(s + "\n")


def getmd5sum(path):
	h = hashlib.md5()
	h.update(open(path, 'rb').read())
	return h.hexdigest()


def help():
	print """
	program ls directory
		
		make listing of all files - each file contains md5sum, size and filename

	program cmp list1 list2
		
		compare two listings, prints file from list1 that do not exists in list2
		or has different md5sum or size 
"""

if __name__ == '__main__':
	main(sys.argv)

# eof