#!/usr/bin/python

import os
import sys
try:
    from subprocess import check_call
except ImportError:
    from subprocess import call
    def check_call(*popenargs, **kwargs):
        retcode = call(*popenargs, **kwargs)
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
            raise Exception("Command '%s' returned non-zero exit status %c" % (cmd, retcode))

(dir1, dir2) = sys.argv[1:]

def local_walk(dir, prefix=''):
    for entry in os.listdir(dir):
        if entry in ('CVS', '.hg', '.hgignore', '.cvsignore'):
            continue
        
        if os.path.isdir("%s/%s" % (dir, entry)):
            for e in local_walk("%s/%s" % (dir, entry),
                                "%s%s%s" % (prefix, prefix != '' and '/' or '', entry)):
                yield e
        else:
            yield "%s/%s" % (prefix, entry)

files2 = {}
for file in local_walk(dir2):
    files2[file] = True

status = 0

for file in local_walk(dir1):
    if file not in files2:
        status = 1
        print "File %s in dir1, not in dir2." % file
        continue

    try:
        check_call(['diff', '-U', '4',
                    '%s/%s' % (dir1, file),
                    '%s/%s' % (dir2, file)])
    except KeyboardInterrupt:
        raise
    except:
        status = 1
        print "File %s doesn't match!" % file
        
    del files2[file]

for file in files2.keys():
    status = 1
    print "File %s in dir2, not in dir1." % file

sys.exit(status)