scala macro - how to expand an Array[TermName] to HList concatenation

Question

Suppose I have a case class

case class(id: Option[Long], name: String, gender: String)

Then I got the field names via compile-time reflect

val names = ... // Array(TermName(id), TermName(name), TermName("gender"))

How could I transform those names to id :: name :: gender :: HNil (which has type Option[Long] :: String :: String :: HNil] )

That is say I am looking for things like q"..$name" in quasiquote but expand names with :: instead of ,

Answer 1

Seems could be done like this

   def hlistConcat[T: Liftable ](elems: Iterable[T]) = {
      val HNil = q"HNil": Tree
      elems.toList.reverse.foldLeft(HNil) { (list, c) =>
        q"$c :: $list"
      }
    }