ScoreKeeper.rb : A quick command-line app written in Ruby for keeping score during Gin Rummy games. Run `ruby scorekeeper.rb` to start the game.

scorekeeper.rb

module ScoreKeeper

  class Player
    attr_accessor :name, :scores
    def initialize(name)
      @name = name
      @scores = []
    end
    def <<(points)
      @scores << points
    end
    def calculate_score([email protected])
      @scores.first(turn_number).to_a.reduce(:+)
    end
  end

  class Game
    def initialize
      @players = []
      @turn = 0
      @printer = Printer.new(25)
      # ask for players' names
      loop do
        print "Player ##{@players.size+1}: "
        new_player = gets.strip
        break if new_player == ""
        @players << Player.new(new_player)
      end
    end
    def print_names
      @printer.print( @players.collect(&:name),true )
    end
    def print_scores
      print_names
      @turn.times do |i|
        @printer.print( @players.collect{ |p| if p.scores[i] > 0 then "+ "+p.scores[i].to_s else p.scores[i] end })
        @printer.print( @players.collect{ |p| p.calculate_score(i+1)},true )
      end
    end
    def turn
      # loop through all players, ask score for each one
      # at the end, print all the scores
      puts "Turn #{@turn+1}"
      @players.each do |player|
        print "#{player.name}: "
        player << gets.strip.to_i
      end
      @turn += 1
      print_scores
    end
  end

  class Printer
    def initialize(columns=20)
      @columns = columns
    end
    def print(values,div=false)
      out = "| "
      values.each do |v|
        out << "%#{@columns}s |" % v
      end
      out << "\n"
      puts out
      line_break(values.size) if div
    end
    def line_break(width)
      out = "|-"
      width.times { out << ("-"*@columns) + "-+" }
      out[-1] = "|"
      puts out
    end
  end

end

# start the game
game = ScoreKeeper::Game.new
game.print_names
loop { game.turn }