class Trailblazer::Operation
  module Policy
    def self.Guard(proc, name: :default, &block)
      Policy.step( Guard.build(proc), name: name )
    end

    module Guard
      def self.build(callable)
        option = Trailblazer::Option::KW(callable)

        # this gets wrapped in a Operation::Result object.
        ->( (options, *), circuit_args ) do
          Result.new(!!option.call(options, circuit_args), {})
        end
      end
    end
  end
end