import scala.util.{Try, Success, Failure}

def option(b: Boolean) = if (b) Some("option") else None
def either(b: Boolean) = if (b) Right("either") else Left(new Exception("either"))
def exception(b: Boolean) = if (b) "exception" else throw new Exception("exception")

// def toEither[A](t: Try[A]) = t.transform({s => Success(Right(s))}, {f => Success(Left(f))}).get.right
def toEither[A](t: Try[A]) = (t match {case Success(v) => Right(v) case Failure(e) => Left(e)}).right

val ft = Seq(false, true)
for (bOpt <- ft; bEit <- ft; bExc <- ft) {
  println()
  println(s"$bOpt $bEit $bExc")
  println(resultOption(bOpt, bEit, bExc))
  println(resultEither(bOpt, bEit, bExc))
}

// Option (success or not)
def resultOption(bOpt: Boolean, bEit: Boolean, bExc: Boolean) = {
  for {
    opt <- option(bOpt)
    eit <- either(bEit).right.toOption
    exc <- Try(exception(bExc)).toOption
  } yield (s"$opt $eit $exc")
}


// Either (success or individual exception)
def resultEither(bOpt: Boolean, bEit: Boolean, bExc: Boolean) = {
  for {
    opt <- option(bOpt).toRight(new Exception("option")).right
    eit <- either(bEit).right
    exc <- toEither(Try(exception(bExc)))
  } yield (s"$opt $eit $exc")
}