test.rb

  require 'coolline'

  Pry.config.input = Coolline.new do |cool|
    cool.word_boundaries = [" ", "\t", ",", ";", ".", '"', "'", "`", "<", ">",
                            "=", ";", "|", "{", "}", "(", ")", "-"]

    cool.history_file = Coolline::NullFile

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

    cool.handlers << Coolline::Handler.new("\C-u") do
      cool.line.clear
      cool.pos = 0
    end
  end