includeしただけで、クラスメソッドも生やしたい

output.txt

$ ruby t.rb
{:push=>[#<Proc:[email protected]:27>]}
{:push=>[#<Proc:[email protected]:27>, #<Proc:[email protected]:29>]}
{:push=>[#<Proc:[email protected]:32>]}
{:push=>[#<Proc:[email protected]:32>, #<Proc:[email protected]:34>]}
{:push=>[#<Proc:[email protected]:37>]}
{:push=>[#<Proc:[email protected]:37>, #<Proc:[email protected]:39>]}

test.rb

module Tiger
  module ClassMethods
    def on(name, &code)
      @triggers       ||= {}
      @triggers[name] ||= []
      @triggers[name].push(code)
      p @triggers
    end
  end

  include ClassMethods
  def self.included(klass)
    klass.extend ClassMethods
  end
end

class TestTigerClass
  include Tiger
end

module TestTigerModule
  include Tiger
end

test_tiger_class = TestTigerClass.new

test_tiger_class.on(:push) do
end
test_tiger_class.on(:push) do
end

TestTigerClass.on(:push) do
end
TestTigerClass.on(:push) do
end

TestTigerModule.on(:push) do
end
TestTigerModule.on(:push) do
end