How to change attribute on Scala XML Element

Question

I have an XML file that I would like to map some attributes of in with a script. For example:

Answer 1

With the help of Scalate's Scuery and its CSS3 selectors and transforms:

def modAttr(name: String, fn: Option[String] => Option[String])(node: Node) = node match {
  case e: Elem =>
    fn(e.attribute(name).map(_.toString))
      .map { newVal => e % Attribute(name, Text(newVal), e.attributes.remove(name)) }
      .getOrElse(e)
}

$("#foo > div[bar]")(modAttr("bar", _ => Some("hello")))

— this transforms e.g. this

into

`