class Middleman::Extension

def generate_resources(resources)
  generator_defs = self.class.resources_generators.reduce({}) do |sum, g|
    resource_definitions = if g.is_a? Hash
      g
    elsif g.is_a? Symbol
      definition = method(g)
      if definition.arity == 0
        send(g)
      else
        send(g, resources)
      end
    else
      {}
    end
    sum.merge!(resource_definitions)
  end
  resources + generator_defs.map do |path, g|
    if g.is_a? Symbol
      definition = method(g)
      g = if definition.arity == 0
        send(g)
      else
        send(g, resources)
      end
    end
    ::Middleman::Sitemap::StringResource.new(
      app.sitemap,
      path,
      g
    )
  end
end