print_self.rb

module PrintSelf
  def inspect
    args = self.method(:initialize).parameters.map{ |param|
      self.instance_variable_get("@#{param[1]}".to_sym).inspect
    }
    "#{self.class}.new(#{args.join(", ")})"
  end
end

print_self_example.rb

$:.push('.')
require 'print_self'

class Human
  include PrintSelf
  def initialize(name, age)
    @name = name
    @age = age
  end
end

p Human.new('inoue', 13) # => Human.new("inoue", 13)
p eval(Human.new('inoue', 13).inspect) # => Human.new("inoue", 13)
p eval(eval(eval(eval(Human.new('inoue', 13).inspect).inspect).inspect).inspect) # => Human.new("inoue", 13)