old_contents: from __future__ import absolute_import
  
  import sys
  from pip.basecommand import Command
  
  BASE_COMPLETION = """
  # pip %(shell)s completion start%(script)s# pip %(shell)s completion end
  """
  
  COMPLETION_SCRIPTS = {
      'bash': """
  _pip_completion()
  {
      COMPREPLY=( $( COMP_WORDS="${COMP_WORDS[*]}" \\
                     COMP_CWORD=$COMP_CWORD \\
                     PIP_AUTO_COMPLETE=1 $1 ) )
  }
  complete -o default -F _pip_completion pip
  """, 'zsh': """
  function _pip_completion {
    local words cword
    read -Ac words
    read -cn cword
    reply=( $( COMP_WORDS="$words[*]" \\
               COMP_CWORD=$(( cword-1 )) \\
               PIP_AUTO_COMPLETE=1 $words[1] ) )
  }
  compctl -K _pip_completion pip
  """}
  
  
  class CompletionCommand(Command):
      """A helper command to be used for command completion."""
      name = 'completion'
      summary = 'A helper command used for command completion'
  
      def __init__(self, *args, **kw):
          super(CompletionCommand, self).__init__(*args, **kw)
  
          cmd_opts = self.cmd_opts
  
          cmd_opts.add_option(
              '--bash', '-b',
              action='store_const',
              const='bash',
              dest='shell',
              help='Emit completion code for bash')
          cmd_opts.add_option(
              '--zsh', '-z',
              action='store_const',
              const='zsh',
              dest='shell',
              help='Emit completion code for zsh')
  
          self.parser.insert_option_group(0, cmd_opts)
  
      def run(self, options, args):
          """Prints the completion code of the given shell"""
          shells = COMPLETION_SCRIPTS.keys()
          shell_options = ['--' + shell for shell in sorted(shells)]
          if options.shell in shells:
              script = COMPLETION_SCRIPTS.get(options.shell, '')
              print(BASE_COMPLETION % {'script': script, 'shell': options.shell})
          else:
              sys.stderr.write(
                  'ERROR: You must pass %s\n' % ' or '.join(shell_options)
              )
  
new_contents: from __future__ import absolute_import
  
  import sys
  from pip.basecommand import Command
  
  BASE_COMPLETION = """
  # pip %(shell)s completion start%(script)s# pip %(shell)s completion end
  """
  
  COMPLETION_SCRIPTS = {
      'bash': """
  _pip_completion()
  {
      COMPREPLY=( $( COMP_WORDS="${COMP_WORDS[*]}" \\
                     COMP_CWORD=$COMP_CWORD \\
                     PIP_AUTO_COMPLETE=1 $1 ) )
  }
  complete -o default -F _pip_completion pip
  """, 'zsh': """
  function _pip_completion {
    local words cword
    read -Ac words
    read -cn cword
    reply=( $( COMP_WORDS="$words[*]" \\
               COMP_CWORD=$(( cword-1 )) \\
               PIP_AUTO_COMPLETE=1 $words[1] ) )
  }
  compctl -K _pip_completion pip
  """}
  
  
  class CompletionCommand(Command):
      """A helper command to be used for command completion."""
      name = 'completion'
      summary = 'A helper command used for command completion.'
  
      def __init__(self, *args, **kw):
          super(CompletionCommand, self).__init__(*args, **kw)
  
          cmd_opts = self.cmd_opts
  
          cmd_opts.add_option(
              '--bash', '-b',
              action='store_const',
              const='bash',
              dest='shell',
              help='Emit completion code for bash')
          cmd_opts.add_option(
              '--zsh', '-z',
              action='store_const',
              const='zsh',
              dest='shell',
              help='Emit completion code for zsh')
  
          self.parser.insert_option_group(0, cmd_opts)
  
      def run(self, options, args):
          """Prints the completion code of the given shell"""
          shells = COMPLETION_SCRIPTS.keys()
          shell_options = ['--' + shell for shell in sorted(shells)]
          if options.shell in shells:
              script = COMPLETION_SCRIPTS.get(options.shell, '')
              print(BASE_COMPLETION % {'script': script, 'shell': options.shell})
          else:
              sys.stderr.write(
                  'ERROR: You must pass %s\n' % ' or '.join(shell_options)
              )
  
subject: Add trailing dot to completion command summary (#3975)