require 'coolline'
require 'coderay'
require 'pp'

cool = Coolline.new do |c|
  c.transform_proc = proc do
    CodeRay.scan(c.line, :ruby).term
  end

  c.completion_proc = proc do
    word = c.completed_word
    Object.constants.map(&:to_s).select { |w| w.start_with? word }
  end
end

loop do
  line = cool.readline

  obj  = eval(line)

  print "=> "
  pp obj
end

 Coolline.bind "\C-z" do |cool|
   puts "Testing key binding with #{cool}!"
 end

gem install coolline