code: def _wrap_usage_section(source, width):
      # type: (str, int) -> str
      
      if not any(len(line) > width for line in source.splitlines()):
          return source
      section_header = source[:source.index(':') + 1].strip()
      lines = [section_header]
      for commands, args in parse_commands(source):
          command = '  {} '.format(' '.join(commands))
          max_len = width - len(command)
          sep = '\n' + ' ' * len(command)
          wrapped_args = sep.join(textwrap.wrap(' '.join(args), max_len))
          full_command = command + wrapped_args
          lines += full_command.splitlines()
      return '\n'.join(lines)
docs: Wrap the given usage section string to the current terminal size.
  
      Note:
          Commands arguments are wrapped to the column that the arguments began
          on the first line of the command.
  
      Args:
          source: The section string to wrap.
  
      Returns:
          The wrapped section string.