First version of SBT build for Scala compiler/l...

First version of SBT build for Scala compiler/library (see README)

1 files changed, 34 insertions, 0 deletions

diff --git a/project/build/ExternalTaskRunner.scala b/project/build/ExternalTaskRunner.scala
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index 0000000000..c9ad97b970
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+++ b/project/build/ExternalTaskRunner.scala
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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, 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
+
+
+
+}
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