gistfile1.txt

      def initialize
        IRB.conf[:PROMPT_MODE] = :SIMPLE
        IRB.conf[:USE_READLINE] = true
        IRB.setup(nil)
        workspace = IRB::WorkSpace.new(binding)
        irb = IRB::Irb.new(workspace)
        IRB.conf[:IRB_RC].call irb.context if IRB.conf[:IRB_RC]
        IRB.conf[:MAIN_CONTEXT] = irb.context
        trap("SIGINT") { irb.signal_handle }
        catch(:IRB_EXIT) { irb.eval_input }
      end