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#!/usr/bin/python
# Copyright 2013 by Matt Domsch
# Licensed under the MIT/X11 license
# usage: symmetric_diff <file a> <file b>
# given two text files a and b, returns the symmetric difference of the lines changed between them.
# The order in which lines appear in each file is irrelevant.
import sys
import optparse
def read_file(filename):
f = open(filename, 'r')
lines = f.readlines()
f.close()
return set(lines)
def diff(a, b):
file_a = read_file(a)
file_b = read_file(b)
sdiff = file_a.symmetric_difference(file_b)
sdiff = list(sdiff)
sdiff.sort()
return sdiff
def main():
parser = optparse.OptionParser(usage=sys.argv[0] + " [options]")
(options, args) = parser.parse_args()
if len(args) < 2:
parser.print_help()
sdiff = diff(args[0], args[1])
for l in sdiff:
sys.stdout.write(l)
if __name__ == "__main__":
sys.exit(main())
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