avdi/naught

require 'naught/null_class_builder/command'

module Naught
  class NullClassBuilder
    module Commands
      class Singleton < Naught::NullClassBuilder::Command
        def call
          defer(:class => true) do |subject|
            require 'singleton'
            subject.module_eval do
              include ::Singleton

              def self.get(*)
                instance
              end

              %w(dup clone).each do |method_name|
                define_method method_name do
                  self
                end
              end
            end
          end
        end
      end
    end
  end
end