gistfile1.scala

import scala.reflect.macros.Context
import scala.language.experimental.macros
import scala.annotation.StaticAnnotation

object helloMacro {
  def impl(c: Context)(annottees: c.Expr[Any]*): c.Expr[Any] = {
    import c.universe._
    import Flag._
    val args = c.prefix.tree match {
      case q"new $name($m)" => c.eval(c.Expr[Map[String, String]](c.resetAllAttrs(m)))
    }
    println(args)
    val result = {
      annottees.map(_.tree).toList match {
        case q"abstract class $name extends ..$parents { ..$body }" :: Nil =>
          q"""
            abstract class $name extends ..$parents {
              def hello: ${typeOf[String]} = "hello"
              ..$body
            }
          """
      }
    }
    c.Expr[Any](result)
  }
}

class hello(m: Map[String, String]) extends StaticAnnotation {
  def macroTransform(annottees: Any*) = macro helloMacro.impl
}

class DoesThisWork(m: Map[String, String]) {
  @hello(m) class T
}