A sequence for FlatStack

sequence.rb

#!/usr/bin/env ruby

element = '1'
elements_count = ARGV[0].to_i

max_count = 20

if elements_count == 0
  print "Write a number of sequence elements to print as an argument for the script. It should be between 1 and #{max_count}.\n"
  exit
end

if elements_count > max_count
  puts "You've asked to print #{elements_count} elements. I won't do that many, just printing #{max_count}."
  elements_count = max_count
end

puts element
for i in 2..elements_count
  element = element.chars.slice_when{|a,b| a != b}.map{|a| "#{a.count}#{a.first}"}.join
  puts element
end