#!/usr/bin/env python
import sys
import re
import subprocess

# Configure your favorite diff program here.
DIFF = "/usr/bin/xmldiff"

# Subversion provides the paths we need as the last two parameters.
LEFT  = sys.argv[-2]
RIGHT = sys.argv[-1]

# Ignore non-XML files
LFILE = sys.argv[3]
filename = re.sub('\t.*$', '', LFILE)
if not filename.endswith('.xml'):
    print "%s is not XML" % filename
    exit(0)

# Call the diff command (change the following line to make sense for
# your diff program).
#cmd = [DIFF, '--not-normalize-spaces', '--exclude-comments', LEFT, RIGHT]
cmd = [DIFF, LEFT, RIGHT]
rc = subprocess.call(cmd)

# Return an errorcode of 0 if no differences were detected, 1 if some were.
# Any other errorcode will be treated as fatal.
if rc > 1:
    exit(1)