import sbt._ import ExternalTaskRunner._ /** * Provide a way to launch a specific task in a new sbt instance. * As the compilation process need to be able to compile in a different process (due to memory related * performance issue) and that in order to keep incremental compilation, we allow to launch a task from a * specific project / sub-project in a different instance of sbt that disappear once the task has finished. */ class ExternalTaskRunner(root:Path,projectName:String, taskName :String, log: Logger ){ def runTask:Option[String] ={ val cmd:Seq[String] = Seq("project "+projectName,taskName) // TODO forward logging level (for example debug) val externalSbt = Process(sbtCommand ++ cmd) log.info("Launching task ["+taskName+"] of project ["+projectName+"] in new sbt instance") externalSbt.! match{ case 0 => None case _ => Some("External Task Failed") } } } object ExternalTaskRunner{ /** * parameters needed to launch another instance of sbt */ val sbtCommand = Seq("sbt") // TODO remove dependency on sbt being on the path of the user }