class Byebug::History

def to_s(n_cmds)
  show_size = n_cmds ? specific_max_size(n_cmds) : default_max_size
  commands = buffer.last(show_size)
  last_ids(show_size).zip(commands).map do |l|
    format("%<position>5d  %<command>s", position: l[0], command: l[1])
  end.join("\n") + "\n"
end