main.rb

module MethodWrapper
	def wrap name, &block
		prepend(Module.new do
			define_method name do
				super_ = proc { super() }
				Object.new.instance_eval do
					define_singleton_method :super_ do
						super_.()
					end
					instance_eval &block
				end
			end
		end)
	end
end


class X
	extend MethodWrapper

	def homu
		p :homu
	end

	wrap :homu do
		p :mami
		super_()
	end
end

X.new.homu