ruby - How do have a class method that redefines other class methods? -

i want wrap class methods module logging, this:

module somemodule    def self.foo     puts "bar"   end    class << self     somemodule.methods(false).each |method|       alias_method "old_#{method}".to_sym, method       define_method method |*args|         puts "called method: #{method}"         send "old_#{method}", *args       end     end   end end  somemodule.foo #-> called method: foo #-> bar 

that works perfectly. if wanted wrapping happen when called method? how make happen when call

module somemodule   def self.foo     puts "bar"   end    def self.add_logging_to_all_methods     #???   end end   somemodule.add_logging_to_all_methods  somemodule.foo #-> called method: foo #-> bar 

i’m not going ask want for, here is:

module somemodule    def self.foo     puts "bar"   end    def self.add_logging_to_all_methods     eigenclass = class << self; self; end     methods(false).each |method|       eigenclass.class_eval         alias_method "old_#{method}".to_sym, method         define_method method |*args|           puts "called method: #{method}"           send "old_#{method}", *args         end       end     end   end end somemodule.add_logging_to_all_methods  somemodule.foo 

be aware adds “logging” add_logging_to_all_methods, after invoking it, if invoke once, should not see wrong.

what eigenclass means “instance” add methods foo , add_logging_to_all_methods. returning self inside class << self; end block i’m getting instance. ask block evaluated in context of instance, more or less same previous method.

there may easier way it.