block.rb

lambda {
  setups = []
  events = {}

  Kernel.send :define_method, :event do |name, &block|
  events[name] = block
  end

  Kernel.send :define_method, :setup do |&block|
  setups << block
  end

  Kernel.send :define_method, :each_event do |&block|
  events.each_pair do |name, event|
    block.call name, event
  end
  end

  Kernel.send :define_method, :each_setup do |&block|
  setups.each do |setup|
    block.call setup
  end
  end
}.call

Dir.glob('*events.rb').each do |file|
  load file
  each_event do |name, event|
    env = Object.new
    each_setup do |setup|
      env.instance_eval &setup
    end
    puts "ALERT: #{name}" if env.instance_eval &event
  end
end