aspect.rb

#!/usr/bin/env ruby

require 'aspector'

watcher = Aspector do
  around(/.*/, except: Object.methods) do |proxy, *args, &block|
    puts "before #{proxy.name} on #{proxy.receiver}"
    proxy.call(*args, &block)
    puts "after #{proxy.name} on #{proxy.receiver}"
  end
end

class Person
  def inst
    "instance method"
  end

  def name
    "Rafael"
  end
end

watcher.apply(Person)
watcher.apply(Person, class_methods: true)

p = Person.new

p.inst
p.name

# Person.new.inst