scala-pp: Pretty printing Scala objects

It's like the Ruby's pp and tapp.

Also provide tap method.

Requirements

Scala 2.11.x (Unfortunately, 2.10.x is not supported yet)

Status

Under development, API will change.

Install

resolvers += "com.todesking" at "http://todesking.github.io/mvn/"

libraryDependencies += "com.todesking" %% "scala-pp" % "0.0.4"

Usage

Basic

import com.todesking.scalapp.ScalaPP

ScalaPP.pp(1)

val pretty: String = ScalaPP.format(1)

import com.todesking.scalapp.syntax._ // Enable any.pp, any.tap

scala> 1.pp
1
res0: Int = 1


scala> "foo".pp
"foo"
res1: String = foo

scala> "foo".tap(_.size.pp)
3
res2: String = foo

scala> import com.todesking.scalapp.syntax._

scala> trait Tree
scala> case class Node(l: Tree, r: Tree) extends Tree
scala> case class Leaf(value: Any) extends Tree

scala> Node(Leaf(1),Node(Node(Leaf(1),Node(Leaf(1),Leaf(2))),Leaf(9))).pp()
Node(
  Leaf(1),
  Node(Node(Leaf(1), Node(Leaf(1), Leaf(2))), Leaf(9))
)
res4: Node = Node(Leaf(1),Node(Node(Leaf(1),Node(Leaf(1),Leaf(2))),Leaf(9)))

scala> val r = new scala.util.Random
scala> (1 to 20).map { _ => r.nextInt }.pp
Vector(
  -154732736,
  -1175868887,
  -1154500417,
  -224679654,
  -1673519284,
  -45175998,
  -1622246443,
  -377114259,
  -594461594,
  -1236591375,
  -367565645,
  1874916582,
  -784108643,
  -676509857,
  -580471591,
  -295290196,
  2101491230,
  1757271540,
  -2072303228,
  -606515791
)
res6: scala.collection.immutable.IndexedSeq[Int] = Vector(-154732736, -1175868887, -1154500417, -224679654, -1673519284, -45175998, -1622246443, -377114259, -594461594, -1236591375, -367565645, 1874916582, -784108643, -676509857, -580471591, -295290196, 2101491230, 1757271540, -2072303228, -606515791)

Format option

scala> implicit val format = new com.todesking.scalapp.DefaultFormat(showMemberName = true)
scala> Node(Leaf(1),Node(Node(Leaf(1),Node(Leaf(1),Leaf(2))),Leaf(9))).pp()
Node(
  l = Leaf(value = 1),
  r =
    Node(
      l =
        Node(
          l = Leaf(value = 1),
          r =
            Node(
              l = Leaf(value = 1),
              r = Leaf(value = 2)
            )
        ),
      r = Leaf(value = 9)
    )
)
res1: Node = Node(Leaf(1),Node(Node(Leaf(1),Node(Leaf(1),Leaf(2))),Leaf(9)))

Change output destination

// pp via stderr(default is stdout)
implicit val out = com.todesking.scalapp.Out.stderr