Canonicalize filename case in system Python 2.7 on macOS

canonicalpath.py

#!/usr/bin/python

from __future__ import print_function

from Carbon.File import FSPathMakeRef
import os
import sys
import unicodedata

def actual_path(path):
    ref, _ = FSPathMakeRef(path)
    out = unicodedata.normalize('NFC', ref.FSRefMakePath().decode('utf-8'))
    if path.endswith(os.path.sep) and not out.endswith(os.path.sep):
        return out + os.path.sep
    return out

def main():
    for p in sys.argv[1:]:
        print(actual_path(p))

if __name__ == '__main__':
    main()