docs: def complete(self, e): # (TAB)
          u"""Attempt to perform completion on the text before point. The
          actual completion performed is application-specific. The default is
          filename completion."""
          completions = self._get_completions()
          if completions:
              cprefix = commonprefix(completions)
              if len(cprefix) > 0:
                  rep = [ c for c in cprefix ]
                  point=self.l_buffer.point
                  self.l_buffer[self.begidx:self.endidx] = rep
                  self.l_buffer.point = point + len(rep) - (self.endidx - self.begidx)
              if len(completions) > 1:
                  if self.show_all_if_ambiguous == u'on':
                      self._display_completions(completions)
                  else:
                      self._bell()
          else:
              self._bell()
          self.finalize()