Dumps object tree to console.

TreeDumps.scala

import java.io.PrintStream

trait TreeDumps[T] {

  def out:PrintStream

  def dump_r(node:T, last:Boolean=true, indent:String=" ") {
    out.println(indent + (if (last) "└" else "├") + describe(node))
    val a = children(node)
    if (a.size > 0) {
      val indent2 = indent + (if (last) "  " else "│ ")
      a.dropRight(1).foreach(dump_r(_, false, indent2))
      dump_r(a.last, true, indent2)
    }
  }

  def describe(node:T):String
  def children(node:T):Seq[T]

}