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

I found it easier to create a separate XML snippet and merge. This code fragment also demonstrates removing elements, adding extra elements and using variables in an XML literal:

val alt = orig.copy(
  child = orig.child.flatMap {
    case b: Elem if b.label == "b" =>
      val attr2Value = "100"
      val x =   //////////////////// Snippet
      Some(b.copy(attributes = b.attributes.append(x.attributes)))

    // Will remove any  elems
    case removeMe: Elem if isElem(removeMe, "remove-me", "some-attrib" -> "specific value") => 
      None

    case keep => Some(keep)
  }
    ++
      

// Tests whether the given element has the given label
private def isElem(elem: Elem, desiredLabel: String, attribValue: (String, String)): Boolean = {
  elem.label == desiredLabel && elem.attribute(attribValue._1).exists(_.text == attribValue._2)
}

For other new-comers to Scala XML, you'll also need to add a separate Scala module to use XML in scala code.