みなとRuby会議01のソーシャルコーディングのやつ

amida.rb

class Amida
  attr_reader :width, :height, :matrix
  def initialize(size)
    @size = size
    @width = size - 1
    @height = @width * 2
    @matrix = Array.new(@height) { Array.new(@width) }
  end

  def gen(num)
    num.times do |i|
      @matrix[rand(@height)][rand(@width)] = true
    end

    @goal = rand(@size)
  end

  def display
    display_header
    display_vline
    display_body
    display_vline
    display_goal
  end

  def display_header
    name = 'A'
    @size.times do
      printf(' %s  ', name)
      name = name.succ
    end

    puts
  end

  def display_vline
    @size.times do
      print(' |  ')
    end

    puts
  end

  def display_body
    @matrix.each_with_index do |line, i|
      print(' ')
      line.each_with_index do |cell, j|
        printf('|%s', ((cell&& j.odd?) ) ? '---' : '   ')
      end
      puts('|')

      print(' ')
      line.each_with_index do |cell, j|
        printf('|%s', ((cell&&j.even?) ) ? '---' : '   ')
      end
      puts('|')
    end
  end

  def display_goal
    display_str = ''
    @size.times do |i|
      display_str << sprintf("%s", (i == @goal) ? '!!! ' : '    ')
    end
    puts(display_str)
  end
end

if __FILE__ == $0
  amida = Amida.new 2
  amida.gen 30
  amida.display
else
  describe Amida do
    describe 'new' do
      subject { Amida.new(4) }
      its(:width) { should == 3 }
      its(:height) { should == 6 }
      its(:matrix) do
        should == [
                    [nil, nil, nil],
                    [nil, nil, nil],
                    [nil, nil, nil],
                    [nil, nil, nil],
                    [nil, nil, nil],
                    [nil, nil, nil],
                  ]
      end
    end

    describe '#gen' do
      before {
        @amida = Amida.new(3)
        @amida.gen(4)
      }
      subject { @amida.matrix }
      it { subject.flatten.uniq.size.should > 1 }
    end

    describe '#display_goal' do
      let(:amida) { Amida.new(3) }
      before do
        amida.instance_variable_set :@goal, 2
      end
    end
  end
end