file.rb

methods_for :dialplan do
  def baz
    speak 'Baz'
  end
end

foo {
  menu do |link|
    link.bar 1
    link.baz 2
  end
}

bar {
  speak 'Bar'
}

class Menu
  def match(&block)
    controller = eval 'self', block.binding
    controller.instance_eval &block
  end
end