Convert Case Class into Final Case Class

FinalCaseClass

import scalafix._
import scala.meta._
import scala.meta.contrib._
import scalafix.Patch
import scalafix.SemanticdbIndex
import scalafix.rule.RuleCtx
import scalafix.rule.SemanticRule

case class FinalCaseClass(index: SemanticdbIndex) extends SemanticRule(index, "FinalCaseClass") {

  def isNonFinalCaseClass = (clz: Defn.Class) => clz.hasMod(mod"case") && clz.mods.size == 1

  override def fix(ctx: RuleCtx): Patch = {
    ctx.tree.collect {
      case cls @ Defn.Class(_) if isNonFinalCaseClass(cls) => {
        val fcc = Defn.Class(Mod.Final() :: cls.mods,cls.name,cls.tparams,cls.ctor,cls.templ)
        ctx.replaceTree(cls.tree,fcc.toString())
      }
    }.asPatch
  }
}