Create an irb session that can access local variables from the startup script

gistfile1.rb

#!/usr/bin/env ruby

require 'irb'

foo = 'bar'

IRB.setup(nil)
irb = IRB::Irb.new(nil)
IRB.conf[:MAIN_CONTEXT] = irb.context
irb.context.workspace = IRB::WorkSpace.new(binding)

trap 'INT' do
  irb.signal_handle
end

catch(:IRB_EXIT) { irb.eval_input }