Don't even think about this.

evil.rb

$pointsz = Hash.new(0)

class Class
  method_blacklist = [:method_added, :===, :to_s, :send, :public_methods, :new]
  methods_to_redefine = public_methods.reject{|m| method_blacklist.include? m }

  methods_to_redefine.each do |m|
    new_name = "__lol_omg_#{m}"

    define_method m do |*args, &blk|
      __lol_omg_puts "#{m} was called with #{args}"
      $pointsz[m] += 1
      send(new_name, *args, &blk)
    end

    alias_method new_name, m
  end
end

class Module
  method_blacklist = [:method_added, :===, :to_s, :send, :public_methods]
  methods_to_redefine = public_methods.reject{|m| method_blacklist.include? m }

  methods_to_redefine.each do |m|
    new_name = "__lol_omg_#{m}"

    define_method m do |*args, &blk|
      __lol_omg_puts "#{m} was called with #{args}"
      $pointsz[m] += 1
      send(new_name, *args, &blk)
    end

    alias_method new_name, m
  end
end

module Kernel
  method_blacklist = BasicObject.public_methods
  methods_to_redefine = public_methods
    .reject{|m| method_blacklist.include? m }
    .reject{|m| m.to_s.start_with?("__lol_omg_") }
    

  methods_to_redefine.each do |m|
    new_name = "__lol_omg_#{m}"

    alias_method new_name, m

    define_method m do |*args, &blk|
      __lol_omg_puts "#{m} was called with #{args}"
      $pointsz[m] += 1
      send(new_name, *args, &blk)
    end
  end
end

at_exit do
  __lol_omg_puts "SUMMARY: "
  __lol_omg_puts "method\t\tcalls"

  $pointsz.each do |k, v|
    __lol_omg_puts "#{k}\t\t#{v}"
  end
end

I particularly enjoy line 41, where I had to check that I didn't try to redefine things I already redefined....

Do I correctly understand that this basically counts messages sent/methods called?

My favorite is the use of __lol_omg_puts.

Why not use __send__ instead? http://stackoverflow.com/a/4658359/310275

@colindean yes

@tsaleh still working on it, might make them have spaces in the name ;)

@jpfuentes2 to call the original ones? I could.

- methods_to_redefine = public_methods.reject{|m| method_blacklist.include? m }
+ methods_to_redefine = public_methods - method_blacklist

Also, you could possibly use set_trace_func for this.