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/** Scala SBT build
* Copyright 2005-2010 LAMP/EPFL
* @author Paul Phillips
*/
import sbt._
/** Worked out a way to fork sbt tasks, preserving all sbt command line
* options and without hardcoding anything.
*/
trait ForkSBT {
self: BasicLayer =>
def jvmArguments: List[String] = {
import scala.collection.jcl.Conversions._
import java.lang.management.ManagementFactory
ManagementFactory.getRuntimeMXBean().getInputArguments().toList
}
private var extraJVMArgs: List[String] = Nil
def withJVMArgs[T](args: String*)(body: => T): T = {
val saved = extraJVMArgs
extraJVMArgs = args.toList
try { body }
finally extraJVMArgs = saved
}
// Set a property in forked sbts to inhibit possible forking cycles.
def markForked = "-D" + forkProperty + "=true"
/** Forks a new process to run "sbt task task ...":
*/
def forkTasks(tasks: String*): Boolean = {
require (!isForked, "Tried to fork but sbt is already forked: " + tasks.mkString(" "))
val sbtJar = System.getProperty("java.class.path")
val sbtMain = "xsbt.boot.Boot" // ok, much of anything.
val args = jvmArguments ++ Seq(markForked, "-classpath", sbtJar, sbtMain) ++ tasks
log.info("Forking: " + args.mkString("java ", " ", ""))
Fork.java(None, args, StdoutOutput) == 0
}
def maybeFork(task: TaskManager#Task): Option[String] = maybeFork(task, "Error during external compilation.")
def maybeFork(task: TaskManager#Task, errorMsg: String): Option[String] = {
if (isForked) task.run
else if (forkTasks("project " + this.name, task.name)) None
else Some(errorMsg)
}
}
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