Ruby Dice Roller plus! (See related posts)

class Dicer
  attr_accessor :rolls, :total, :bonus

  def initialize
    @rolls = []
    @total = 0
    @bonus = 0
  end

  def +(bonus)
    if bonus.instance_of?(Fixnum)
      @bonus += bonus
      @total += bonus
    else
      @rolls += bonus.rolls
      @total += bonus.total
      @bonus += bonus.total
    end
    self
  end
end

class Fixnum

  def d(sides=2)
    out = Dicer.new{|h,k| h[k] = []}
    self.times {
      out.rolls << 1 + rand(sides)
    }
    out.total = out.rolls.inject{|sum,n| sum + n}
    out
  end

end

>> d = Dicer.new
=> #<Dicer:0x1107f4c @rolls=[], @total=0, @bonus=0>
>> 3.d(6)
=> #<Dicer:0x1106d40 @rolls=[2, 3, 4], @total=9, @bonus=0>
>> 3.d(6)+1
=> #<Dicer:0x11056c0 @rolls=[3, 1, 1], @total=6, @bonus=1>
>> 3.d(6)+2+1.d(4)
=> #<Dicer:0x1103320 @rolls=[2, 5, 1, 3], @total=13, @bonus=5>