Simple Scala Macro

SimpleMacro.scala

import scala.reflect.macros.blackbox.Context
import scala.language.experimental.macros
class LoggerImpl(val c: Context) {
  import c.universe._

  def getClassSymbol(s: Symbol): Symbol = if (s.isClass) s else getClassSymbol(s.owner)

  def logImpl(msg: Expr[String]): Expr[Unit] = {
    val cl = getClassSymbol(c.internal.enclosingOwner).toString
    val time = c.Expr[String](q"new java.util.Date().toString")
    val logline = c.Expr[String](q""" "[" + $cl + " : " + $time + "]" + $msg """)
    c.Expr[Unit](q"println($logline)")
  }
}

object Logger {
  def warning(msg: String): Unit = macro LoggerImpl.logImpl
}

// https://stackoverflow.com/questions/33909930/what-is-the-best-way-to-get-the-name-of-the-caller-class-in-an-object/