old_contents: # -*- coding: utf-8 -*-
  # vim: sw=4:ts=4:expandtab
  
  """
  bump.shell_utils
  ~~~~~~~~~~~~~~~
  
  helpers for working with the shell.
  
  Examples:
      basic usage::
  
          >>> sh('echo hello world')
          True
          >>> sh('echo hello world', True)
          'hello world'
  
  Attributes:
      ENCODING (str): The module encoding
  """
  
  from __future__ import (
      absolute_import, division, print_function, with_statement,
      unicode_literals)
  
  import pygogo as gogo
  
  from subprocess import call, check_output
  
  logger = gogo.Gogo(__name__).logger
  
  
  def sh(cmd, output=False, path=None):
      """
      runs an external command.
  
      if the command has a non-zero return code raise a buildfailure. you can pass
      `error=True` to allow non-zero return codes to be allowed to pass silently,
      silently into the night. passing `path="some/path"` will chdir to
      "some/path" before exectuting the command.
  
          :returns: string of the captured output of the command.
      """
      go = True
  
      if path:
          try:
              call(['cd', path])
          except OSError:
              logger.error('No such file or directory: %s', path)
              go = False
  
      if output and go:
          result = check_output(cmd, shell=True).strip()
      elif go:
          result = call(cmd, shell=True) is 0
      elif output:
          result = ''
      else:
          result = False
  
      return result
  
  
  def choice(msg):
      """
      prompts for a True/False input from the user command line.
  
          :returns: boolean for the True/False user response.
      """
      return raw_input("{}  [Yn]: ".format(msg)).lower().startswith('y')
  
new_contents: # -*- coding: utf-8 -*-
  # vim: sw=4:ts=4:expandtab
  
  """
  bump.shell_utils
  ~~~~~~~~~~~~~~~~
  
  helpers for working with the shell.
  
  Examples:
      basic usage::
  
          >>> sh('echo hello world')
          True
          >>> sh('echo hello world', True)
          'hello world'
  
  Attributes:
      ENCODING (str): The module encoding
  """
  
  from __future__ import (
      absolute_import, division, print_function, with_statement,
      unicode_literals)
  
  import pygogo as gogo
  
  from subprocess import call, check_output
  
  logger = gogo.Gogo(__name__).logger
  
  
  def sh(cmd, output=False, path=None):
      """
      runs an external command.
  
      if the command has a non-zero return code raise a buildfailure. you can pass
      `error=True` to allow non-zero return codes to be allowed to pass silently,
      silently into the night. passing `path="some/path"` will chdir to
      "some/path" before exectuting the command.
  
          :returns: string of the captured output of the command.
      """
      go = True
  
      if path:
          try:
              call(['cd', path])
          except OSError:
              logger.error('No such file or directory: %s', path)
              go = False
  
      if output and go:
          result = check_output(cmd, shell=True).strip()
      elif go:
          result = call(cmd, shell=True) is 0
      elif output:
          result = ''
      else:
          result = False
  
      return result
  
  
  def choice(msg):
      """
      prompts for a True/False input from the user command line.
  
          :returns: boolean for the True/False user response.
      """
      return raw_input("{}  [Yn]: ".format(msg)).lower().startswith('y')
  
subject: Edit docblock