So, Ruby 2.1 lets you do interesting things...

gistfile1.rb

#!/usr/bin/env ruby -w

class Derp
  @exportable = []
  class << self
    def exportable(meth)
      @exportable << meth
    end

    def exportable_methods
      @exportable
    end
  end

  exportable def something
    "foon"
  end
end

puts Derp.exportable_methods