Playframework 2.2 Grunt Runner

build.sbt

name := "GruntApp"

version := "1.0-SNAPSHOT"

libraryDependencies ++= Seq(
  jdbc,
  anorm,
  cache
)

play.Project.playScalaSettings

playRunHooks <+= baseDirectory.map(base => Grunt(base / "app" / "assets"))

Grunt.scala

import sbt._
import Keys._
import java.net._
import java.io.File
import play.PlayRunHook

/*
  Grunt runner should be in project directory to be picked up by sbt
*/
object Grunt {
  def apply(base: File): PlayRunHook = {

    object GruntProcess extends PlayRunHook {

      var process: Option[Process] = None

      override def beforeStarted(): Unit = {
        Process("grunt dist", base).run
      }
      
      override def afterStarted(addr: InetSocketAddress): Unit = {
        process = Some(Process("grunt run", base).run)
      }

      override def afterStopped(): Unit = {
        process.map(p => p.destroy())
        process = None
      }
    }

    GruntProcess
  }
}