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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,errorMessage: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(errorMessage)
}
}
}
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
}
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