module Unified

  class UsingHash < Hash
    def use(key)
      wrap(self[key]).tap do
        delete(key)
      end
    end

    def use!(key)
      wrap(fetch(key)).tap do
        delete(key)
      end
    end

    private

    def wrap(v)
      case v
      when Hash
        self.class[v]
      when Array
        v.map do |subv|
          wrap(subv)
        end
      else
        v
      end
    end
  end
end