Configuration

gistfile1.rb

# your_lib.rb
module YourLib
  def self.configure
    yield Config
  end
end

# your_lib/config.rb
module YourLib
  module Config
    extend self
    attr_accessor :option1, :option2
  end
end

# setting
YourLib.configure do |config|
  config.option1 = 1
end
YourLib::Config.option2 = 2

# getting
YourLib::Config.option1
#=> 2
YourLib::Config.option2
#=> 2

extend self comes unexpected. Kind of scary, but results in a nice API.