#!/usr/bin/env python
"""
mutexdiff
Kelvie Wong
Compares two files and prints lines that are not exclusive to a particular
file.  This behavior may be inversed using the `-i' command line parameter.
"""

import sys, os

inverse = False
for arg in sys.argv:
    if arg[0] == "-":
        if arg[1] == "i":
            # Invert it
            inverse = True
            sys.argv.remove("-i")
# sys.argv is the argument list, argv[1] is the first argument,
# argv[2] is the second, and so on
file1 = open(sys.argv[1])
file2 = open(sys.argv[2])

items = []
for line in file2:
    items += [line]

for line in file1:
    if not inverse:
        if line not in items:
            print line.strip("\n")
    else:
        if line in items:
            print line.strip("\n")