def auto_range(direction)
      prev_line = processor.prev_line

      if direction == "=" || prev_line.nil?
        source_file_formatter.range_around(frame.line)
      else
        source_file_formatter.range_from(move(prev_line, size, direction))
      end
    end
def auto_range(direction)
      prev_line = processor.prev_line

      if direction == "=" || prev_line.nil?
        source_file_formatter.range_around(frame.line)
      else
        source_file_formatter.range_from(move(prev_line, size, direction))
      end
    end
Set line range to be printed by list

 @return first line number to list
 @return last line number to list