text: import unicodedata
  import sys
  from setuptools.compat import unicode as decoded_string
  
  
  # HFS Plus uses decomposed UTF-8
  def decompose(path):
      if isinstance(path, decoded_string):
          return unicodedata.normalize('NFD', path)
      try:
          path = path.decode('utf-8')
          path = unicodedata.normalize('NFD', path)
          path = path.encode('utf-8')
      except UnicodeError:
          pass  # Not UTF-8
      return path
  
  
  def filesys_decode(path):
      """
      Ensure that the given path is decoded,
      NONE when no expected encoding works
      """
  
      fs_enc = sys.getfilesystemencoding()
      if isinstance(path, decoded_string):
          return path
  
      for enc in (fs_enc, "utf-8"):
          try:
              return path.decode(enc)
          except UnicodeDecodeError:
              continue
  
  
  def try_encode(string, enc):
      "turn unicode encoding into a functional routine"
      try:
          return string.encode(enc)
      except UnicodeEncodeError:
          return None
  