Parse -Dpartest.scalac_opts in SBT runner

This is required to pass the `-optimise` flag down to partest in PR
validation builds.

Author: szeiger

src/main/scala/scala/tools/partest/nest/Runner.scala

@@ -253,7 +253,7 @@ class Runner(val testFile: File, val suiteRunner: SuiteRunner) {
     // use lines in block so labeled? Default to sorry, Charlie.
     def retainOn(expr: String) = {
       val f = expr.trim
-      val allArgs = suiteRunner.scalacExtraArgs ++ PartestDefaults.scalacOpts.split(' ')
+      val allArgs = suiteRunner.scalacExtraArgs ++ suiteRunner.scalacOpts.split(' ')
       def flagWasSet(f: String) = allArgs contains f
       val (invert, token) =
         if (f startsWith "!") (true, f drop 1) else (false, f)
@@ -756,7 +756,8 @@ class SuiteRunner(
   val javaCmdPath: String = PartestDefaults.javaCmd,
   val javacCmdPath: String = PartestDefaults.javacCmd,
   val scalacExtraArgs: Seq[String] = Seq.empty,
-  val javaOpts: String = PartestDefaults.javaOpts) {
+  val javaOpts: String = PartestDefaults.javaOpts,
+  val scalacOpts: String = PartestDefaults.scalacOpts) {
 
   import PartestDefaults.{ numThreads, waitTime }
 
@@ -774,7 +775,7 @@ class SuiteRunner(
   s"""|Partest version:     ${Properties.versionNumberString}
       |Compiler under test: ${relativize(fileManager.compilerUnderTest.getAbsolutePath)}
       |Scala version is:    $versionMsg
-      |Scalac options are:  ${(scalacExtraArgs ++ PartestDefaults.scalacOpts.split(' ')).mkString(" ")}
+      |Scalac options are:  ${(scalacExtraArgs ++ scalacOpts.split(' ')).mkString(" ")}
       |Compilation Path:    ${relativize(joinPaths(fileManager.testClassPath))}
       |Java binaries in:    $vmBin
       |Java runtime is:     $vmName

src/main/scala/scala/tools/partest/nest/SBTRunner.scala

@@ -21,8 +21,19 @@ class SBTRunner(partestFingerprint: Fingerprint, eventHandler: EventHandler, log
   printSummary = false
   partestCmd   = "partest"
 
+  val defs = {
+    val Def = "-D([^=]*)=(.*)".r
+    args.collect { case Def(k, v) => (k, v) }
+  }
+
   val javaOpts = {
-    val l = args.filter(_.startsWith("-Dpartest.java_opts=")).map(_.substring(20))
+    val l = defs.collect { case ("partest.java_opts", v) => v }
+    if(l.isEmpty) PartestDefaults.javaOpts
+    else l.mkString(" ")
+  }
+
+  val scalacOpts = {
+    val l = defs.collect { case ("partest.scalac_opts", v) => v }
     if(l.isEmpty) PartestDefaults.javaOpts
     else l.mkString(" ")
   }
@@ -35,7 +46,8 @@ class SBTRunner(partestFingerprint: Fingerprint, eventHandler: EventHandler, log
     javaCmdPath = Option(javaCmd).map(_.getAbsolutePath) getOrElse PartestDefaults.javaCmd,
     javacCmdPath = Option(javacCmd).map(_.getAbsolutePath) getOrElse PartestDefaults.javacCmd,
     scalacExtraArgs = scalacArgs,
-    javaOpts = javaOpts) {
+    javaOpts = javaOpts,
+    scalacOpts = scalacOpts) {
 
       override def onFinishTest(testFile: File, result: TestState): TestState = {
         eventHandler.handle(new Event {