如何漂亮地打印scala类型？

Question

I want to show the user a value, a simplified type and the original type.

I'm using pprint library for the value and scala.Manifest for the type.

def render[T](a: T)(implicit m: Manifest[T]): (String, String, String) =
  (pprint(a), simplify(m), m.toString)

I want to implement this simplify function.

It would remove common imports

def simplify[T](m: Manifest[T]): String =
  m.toString
   .replaceAll("scala.", "")
   .replaceAll("scala.collection.immutable.", "")
   .replaceAll("scala.collection.mutable.", "")
   .replaceAll("java.lang.", "")

but m.toString has the following drawback

• desugars functions, (Int, Int) => Int becomes scala.Function2[Int, Int, Int]
• desugars tuples, (Int, Int) becomes scala.Tuple2[Int, Int]

Answer 1

type pretty print is implemented in ammonite-repl with TPrint[T]

libraryDependencies += "com.lihaoyi" % "ammonite-repl" % "0.5.4" cross CrossVersion.full

import ammonite.repl.frontend.TPrint
val config = pprint.Config.Defaults.PPrintConfig
def render[T](a: T)(implicit tp: TPrint[T], m: Manifest[T]): (String, String, String) =
  (pprint(a), tp.render(config), m.toString)