code: def _line(self, text, indent=0):
          
          leading_space = '  ' * indent
          while len(leading_space) + len(text) > self.width:
              # The text is too wide; wrap if possible.
  
              # Find the rightmost space that would obey our width constraint and
              # that's not an escaped space.
              available_space = self.width - len(leading_space) - len(' $')
              space = available_space
              while True:
                  space = text.rfind(' ', 0, space)
                  if (space < 0 or
                      self._count_dollars_before_index(text, space) % 2 == 0):
                      break
  
              if space < 0:
                  # No such space; just use the first unescaped space we can find.
                  space = available_space - 1
                  while True:
                      space = text.find(' ', space + 1)
                      if (space < 0 or
                          self._count_dollars_before_index(text, space) % 2 == 0):
                          break
              if space < 0:
                  # Give up on breaking.
                  break
  
              self.output.write(leading_space + text[0:space] + ' $\n')
              text = text[space+1:]
  
              # Subsequent lines are continuations, so indent them.
              leading_space = '  ' * (indent+2)
  
          self.output.write(leading_space + text + '\n')
docs: Write 'text' word-wrapped at self.width characters.