#!/usr/bin/python

# It compares 'du' outputs from different dates, and shows the differences

# in size between them.

#

# It output 4 columns: Change, Inc/decrement, Last size, Directory name

# Change can be of 4 types:

# * +, it means "increment in size"

# * -, it means "decrement in size"

# * N+, it means new directory, incrementing in size

# * D-, it means deleted directory, decrementing in size

import sys,string

if len(sys.argv) != 3:

	print "Wrong number of arguments."

	sys.exit()

du_first =  open(sys.argv[1],"r")

du_second = open (sys.argv[2],"r")

usage_first= {}

for line in du_first:

	elements = line.rstrip().split("\t",1)

	usage_first[elements[1]] = int(elements[0])

du_first.close()

usage_second = usage_first

for line in du_second:

	elements = line.rstrip().split("\t",1)

	elements[0] = int(elements[0])

	if usage_first.has_key(elements[1]):

		if usage_first[elements[1]] > elements[0]:

			print "-\t%d\t%d\t%s" % ( usage_first[elements[1]] - elements[0],elements[0], elements[1] )

		elif usage_first[elements[1]] < elements[0]:

			print "+\t%d\t%d\t%s" % ( elements[0] - usage_first[elements[1]], elements[0], elements[1] )

		del usage_second[elements[1]]

	else:

			print "N+\t%d\t%d\t%s" % ( elements[0] , elements[0] ,elements[1] )

du_second.close()

for key in usage_second.keys():

			print "D-\t%d\t%d\t%s" % ( usage_second[key] , usage_second[key], key )