Scala macro to print code?

Question

I want to do something like this:

def assuming[A](condition: => Boolean)(f: => A): A = {
  require(condition, /* print source-code of condition */)
  f         


        

Answer 1

Have you consulted the docs at:

http://www.scala-lang.org/api/2.11.0/scala-reflect/#scala.reflect.api.Printers

scala> show(q"-1 < 0")
res6: String = -1.$less(0)

scala> showCode(q"-1 < 0")
res7: String = (-1).<(0)

Alternatively, folks have used source positions to glean snippets to print.