Controlling Terminal Cursor in Ruby

cursor.rb

class String
  def mv_up(n=1)
    cursor(self, "\033[#{n}A")
  end

  def mv_down(n=1)
    cursor(self, "\033[#{n}B")
  end

  def mv_fw(n=1)
    cursor(self, "\033[#{n}C")
  end

  def mv_bw(n=1)
    cursor(self, "\033[#{n}D")
  end

  def cls_upline
    cursor(self, "\e[K")
  end

  def cls
    # cursor(self, "\033[2J")
    cursor(self, "\e[H\e[2J")
  end

  def save_position
    cursor(self, "\033[s")
  end

  def restore_position
    cursor(self, "\033[u")
  end

  def cursor(text, position)
    "\r#{position}#{text}"
  end
end