class ActionView::Template::Handlers::Builder

def call(template)
  require_engine
  "xml = ::Builder::XmlMarkup.new(:indent => 2);" +
    "self.output_buffer = xml.target!;" +
    template.source +
    ";xml.target!;"
end

def require_engine
  @required ||= begin
    require "builder"
    true
  end
end