new_contents: #!/usr/bin/env python3
  # -*- coding: UTF-8 -*-
  
  # Copyright 2017 Eddie Antonio Santos <easantos@ualberta.ca>
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """
  Miscellaneous filehashes
  """
  
  import sys
  
  
  def filehashes(file=sys.stdin):
      """
      Yields valid filehashes from stdin.
      """
      # TODO: throw on invalid input
      # TODO: warn on invalid input
      for line in file:
          filehash = line.strip()
          if filehash:
              yield filehash
  
subject: Add filehashes utility.