Scala example source code file (ReplDir.scala)

This example Scala source code file (ReplDir.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

abstractfile, collection, compiler, directory, generics, int, io, mutablesettings, none, nsc, plaindirectory, reflection, repldir, reploutput, replrealdir, replvirtualdir, virtualdirectory

The ReplDir.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Paul Phillips
 */

package scala.tools.nsc
package interpreter

import io.VirtualDirectory
import settings.MutableSettings
import scala.reflect.io.{ AbstractFile, PlainDirectory, Directory }
import scala.collection.generic.Clearable

/** Directory to save .class files to. */
trait ReplDir extends AbstractFile with Clearable { }

private class ReplVirtualDir() extends VirtualDirectory("(memory)", None) with ReplDir { }
private class ReplRealDir(dir: Directory) extends PlainDirectory(dir) with ReplDir {
  def clear() = {
    dir.deleteRecursively()
    dir.createDirectory()
  }
}

class ReplOutput(val dirSetting: MutableSettings#StringSetting) {
  // outdir for generated classfiles - may be in-memory (the default),
  // a generated temporary directory, or a specified outdir.
  val dir: ReplDir = (
    if (dirSetting.isDefault)
      new ReplVirtualDir()
    else if (dirSetting.value == "")
      new ReplRealDir(Directory.makeTemp("repl"))
    else
      new ReplRealDir(Directory(dirSetting.value))
  )

  // print the contents hierarchically
  def show(out: JPrintWriter) = {
    def pp(root: AbstractFile, indentLevel: Int) {
      val label = root.name
      val spaces = "    " * indentLevel
      out.println(spaces + label)
      if (root.isDirectory)
        root.toList sortBy (_.name) foreach (x => pp(x, indentLevel + 1))
    }
    pp(dir, 0)
  }
}