old_contents: # Copyright © 2016 Jakub Wilk <jwilk@jwilk.net>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the “Software”), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  '''
  miscellanea
  '''
  
  import io
  import sys
  
  consonants = frozenset('DSTZbdfghjklmnprstvwz')
  vowels = frozenset('03@AEIOUVaeiou')
  
  def choose_art(phon):
      try:
          p = phon.strip(",'")[0]
      except IndexError:
          return NotImplemented
      if p in consonants:
          return 'a'
      elif p in vowels:
          return 'an'
      else:
          return NotImplemented
  
  def warn(msg):
      print('anorack: warning: ' + msg, file=sys.stderr)
  
  def open_file(path, *, encoding, errors):
      '''
      open() with special case for “-”
      '''
      if path == '-':
          return io.TextIOWrapper(
              sys.stdin.buffer,
              encoding=encoding,
              errors=errors,
          )
      else:
          return open(
              path, 'rt',
              encoding=encoding,
              errors=errors,
          )
  
  __all__ = [
      'choose_art',
      'open_file',
      'warn',
  ]
  
  # vim:ts=4 sts=4 sw=4 et
  
new_contents: # Copyright © 2016 Jakub Wilk <jwilk@jwilk.net>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the “Software”), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  '''
  miscellanea
  '''
  
  import io
  import sys
  
  consonants = frozenset('DSTZbdfghjklmnprstvwz')
  vowels = frozenset('03@AEIOUVaeiou')
  
  def choose_art(phon):
      '''
      choose correct article for the phonemes:
      return “a” or “an” or NotImplemented
      '''
      try:
          p = phon.strip(",'")[0]
      except IndexError:
          return NotImplemented
      if p in consonants:
          return 'a'
      elif p in vowels:
          return 'an'
      else:
          return NotImplemented
  
  def warn(msg):
      '''
      print warning message
      '''
      print('anorack: warning: ' + msg, file=sys.stderr)
  
  def open_file(path, *, encoding, errors):
      '''
      open() with special case for “-”
      '''
      if path == '-':
          return io.TextIOWrapper(
              sys.stdin.buffer,
              encoding=encoding,
              errors=errors,
          )
      else:
          return open(
              path, 'rt',
              encoding=encoding,
              errors=errors,
          )
  
  __all__ = [
      'choose_art',
      'open_file',
      'warn',
  ]
  
  # vim:ts=4 sts=4 sw=4 et
  
subject: add docstrings.