Cadence measuring with the rubies

HACK THE PLANET.rb

SAMPLE_SIZE = 100 # set this

i = 0
matches = {}

old = " "

while i < SAMPLE_SIZE
	begin
	  system("stty raw -echo")
		t1 = Time.now.to_f
	  str = STDIN.getc
		t2 = Time.now.to_f
	ensure
	  system("stty -raw echo")
	end
	printf str.chr
	
	time = (t2-t1).to_s
	matches[old+' '+str.chr] = [] unless matches[old+' '+str.chr]
	matches[old+' '+str.chr] << time
	
	old = str.chr
	i+=1
end

printf "\n\n\n"

matches.keys.each{|k|
	val = matches[k].inject{ |sum, el| sum.to_f + el.to_f }.to_f / matches[k].size
	puts "#{k} : #{val.to_s} (#{matches[k].size})"
}