run sub process while runnning play

build.sbt

name := "fuga"

version := "1.0-SNAPSHOT"

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

play.Project.playScalaSettings

playRunHooks += { SubProcess("tail -f /var/log/system.log") }

Build.scala

import sbt._
import Process._
import Keys._
import play.PlayRunHook

object SubProcess {
  def apply(command: String): PlayRunHook = {

    object SubProcessHook extends PlayRunHook {

      var process: Option[Process] = None

      override def beforeStarted(): Unit = {
        process = Some(Process(command).run)
      }

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

    SubProcessHook
  }
}