class Github::ApiFactory

def self.convert_to_constant(classes)
  classes.split('::').inject(Github) do |constant, klass|
    constant.const_get klass
  end
end

def self.create_instance(klass, options, &block)
  options.symbolize_keys!
  convert_to_constant(klass.to_s).new options, &block
end

def self.new(klass, options={}, &block)
  return create_instance(klass, options, &block) if klass
  raise ArgumentError, 'must provide API class to be instantiated'
end