Scalafix rule to convert empty case class to object

EmptyCaseClassToObject

/**
  * Changes a case class Foo() into case object Foo
  */
case class EmptyCaseClassToObject(index: SemanticdbIndex) extends SemanticRule(index, "EmptyCaseClassToObject") {

  val isEmptyCaseClass = (c: Defn.Class) => c.ctor.paramss.forall(_.isEmpty) && c.mods.nonEmpty
  override def fix(ctx: RuleCtx): Patch = {

    ctx.tree.collect {
      case c @ Defn.Class(_) if isEmptyCaseClass(c)  =>
        val co = Defn.Object(c.mods,Term.Name(c.name.value),c.templ)
      ctx.removeTokens(c.tokens) + ctx.addRight(c ,co.toString())
    }.asPatch

  }
}