Berlin Clock Kata

clock.rb

# Paul Visscher and Greg Mefford
require 'rspec/given'
require 'time'

class BerlinClock

  def self.convert_time(time)
    t = Time.parse(time)
    clock = ""

    if t.sec % 2 == 0
      clock << "Y\n"
    else
      clock << ".\n"
    end

    clock << split_lights(t.hour, 4, 4).gsub('*', 'R')

    clock << split_lights(t.min, 11, 4)

    clock[14] = "R" if clock[14] == "*"
    clock[17] = "R" if clock[17] == "*"
    clock[20] = "R" if clock[20] == "*"
    clock.gsub!('*', "Y")

    return clock
  end

  private
  def self.split_lights(value, size1, size2, mod = 5)
    str = ""
    fives, ones = value.divmod(mod)

    str << "*" * fives
    str << "." * (size1 - fives)
    str << "\n"
    str << "*" * ones
    str << "." * (size2 - ones)
    str << "\n"
  end
end

describe BerlinClock do
  describe "berlin clock" do
    Then { BerlinClock.convert_time("00:00:00").should == "Y\n....\n....\n...........\n....\n" }
    Then { BerlinClock.convert_time("00:00:01").should == ".\n....\n....\n...........\n....\n" }
    Then { BerlinClock.convert_time("00:00:02").should == "Y\n....\n....\n...........\n....\n" }
    Then { BerlinClock.convert_time("01:00:02").should == "Y\n....\nR...\n...........\n....\n" }
    Then { BerlinClock.convert_time("02:00:02").should == "Y\n....\nRR..\n...........\n....\n" }
    Then { BerlinClock.convert_time("03:00:02").should == "Y\n....\nRRR.\n...........\n....\n" }
    Then { BerlinClock.convert_time("04:00:02").should == "Y\n....\nRRRR\n...........\n....\n" }
    Then { BerlinClock.convert_time("05:00:02").should == "Y\nR...\n....\n...........\n....\n" }
    Then { BerlinClock.convert_time("06:00:02").should == "Y\nR...\nR...\n...........\n....\n" }
    Then { BerlinClock.convert_time("06:01:02").should == "Y\nR...\nR...\n...........\nY...\n" }
    Then { BerlinClock.convert_time("06:27:02").should == "Y\nR...\nR...\nYYRYY......\nYY..\n" }
    Then { BerlinClock.convert_time("06:59:59").should == ".\nR...\nR...\nYYRYYRYYRYY\nYYYY\n" }
    Then { BerlinClock.convert_time("23:00:00").should == "Y\nRRRR\nRRR.\n...........\n....\n" }
    Then { BerlinClock.convert_time("23:59:59").should == ".\nRRRR\nRRR.\nYYRYYRYYRYY\nYYYY\n" }
  end
end

# if not running in rspec...
# while true do
#   puts "\e[7A"
#   puts BerlinClock.convert_time(Time.now.to_s).gsub(".", "\e[1m\e[30m.\e[0m").gsub("Y", "\e[1m\e[33mY\e[0m").gsub("R", "\e[1m\e[31mR\e[0m")
#   puts Time.now
#   sleep 1
# end