some_module/config.rb

gistfile1.rb

require 'singleton'
require 'yaml'
require 'rubygems'
require 'active_support/core_ext'

module SomeModule
  module Config
    def self.included(klass)
      klass.extend ClassMethods
    end

    module ClassMethods
      def config
        @config ||= Configuration.instance.config
      end
    end

    class Configuration
      include Singleton

      attr_reader :config

      def initialize(yml = 'config.yml')
        @config = HashWithIndifferentAccess.new(YAML.load(File.read(yml)))
        @config.freeze
      end
    end
  end
end