super-hook

superhook.rb

module PaymentDetails

  def hello
    puts 'Simple'
  end

  module Multi
    def hello
      puts 'Multi'
    end
  end
end

module HookMechanism
  module_function def _hooker(obj, call_method)
    case call_method
    when Proc
      obj.instance_exec(&call_method)
    when Symbol
      obj.send call_method
    else
      call_method
    end
  end

  def hook(*methods, condition:)
    methods.each do |method_sym|
      instance_eval do
        alias_method "_old_#{method_sym}", method_sym
        define_method method_sym do |*args,&block|
          return super(*args, &block) if HookMechanism._hooker(self, condition)
          send "_old_#{method_sym}", *args, &block
        end
      end
    end
  end
end


class Account
  extend HookMechanism
  include PaymentDetails
  hook :hello, condition: :configured?

  include PaymentDetails::Multi

  def initialize(configured = false)
    @configured = configured
  end

  def configured?
    @configured
  end
end

Account.new(false).hello
Account.new(true).hello