module Doorkeeper::Config::Option

def extended(base)
  base.send(:private, :option)
end

option :scopes :builder_class => ScopesBuilder
option :name, :default => "My Name"
option :name, :as => :set_name
option :name

==== Examples

* [+:default+] The default value in case no option was set
* [:+as+] Set the builder method that goes inside +configure+ block

==== Options

that returns the value of the config attribute.
Builder should take a block as the initializer parameter and respond to function +build+
define +builder_class+ parameter.
If you want to introduce another level of config DSL you can

option while the config attribute will be the +name+ parameter.
If the +:as+ option is defined, the builder method will be the specified
The +name+ parameter will set both builder method and config attribute.

+Builder+ class.
in the +Config+ class and the other method will take place in the
When you call option, it defines two methods. One method will take place

Defines configuration option

def option(name, options = {})
  attribute = options[:as] || name
  attribute_builder = options[:builder_class]
  Builder.instance_eval do
    define_method name do |*args, &block|
      # TODO: is builder_class option being used?
      value = unless attribute_builder
        block ? block : args.first
      else
        attribute_builder.new(&block).build
      end
      @config.instance_variable_set(:"@#{attribute}", value)
    end
  end
  define_method attribute do |*args|
    if instance_variable_defined?(:"@#{attribute}")
      instance_variable_get(:"@#{attribute}")
    else
      options[:default]
    end
  end
  public attribute
end