Build speclib/instrumented.jar for partest

- Build automatically from sources instead of fetching a pre-built
  binary which can get out of date and needs to be updated manually

- Remove outdated build script (from the ant days)

Author: szeiger

build.sbt

@@ -57,8 +57,7 @@ val partestDependencies =  Seq(
   "methvsfield" -> "be8454d5e7751b063ade201c225dcedefd252775",
   "nest"        -> "cd33e0a0ea249eb42363a2f8ba531186345ff68c"
 ).map(bootstrapDep("test/files/lib")) ++ Seq(
-  bootstrapDep("test/files/codelib")("code" -> "e737b123d31eede5594ceda07caafed1673ec472") % "test",
-  bootstrapDep("test/files/speclib")("instrumented" -> "d015eff38243f1c2edb44ac3b6a0ce99bc5656db") % "test"
+  bootstrapDep("test/files/codelib")("code" -> "e737b123d31eede5594ceda07caafed1673ec472") % "test"
 )
 
 lazy val publishSettings : Seq[Setting[_]] = Seq(
@@ -552,6 +551,36 @@ lazy val scalacheckLib = project.in(file("src") / "scalacheck")
     libraryDependencies += testInterfaceDep
   )
 
+// An instrumented version of BoxesRunTime and ScalaRunTime for partest's "specialized" test category
+lazy val specLib = project.in(file("test") / "instrumented")
+  .dependsOn(library, reflect, compiler)
+  .settings(clearSourceAndResourceDirectories)
+  .settings(commonSettings)
+  .settings(disableDocs)
+  .settings(disablePublishing)
+  .settings(
+    sourceGenerators in Compile += Def.task {
+      import scala.collection.JavaConverters._
+      val srcBase = (sourceDirectories in Compile in library).value.head / "scala/runtime"
+      val targetBase = (sourceManaged in Compile).value / "scala/runtime"
+      def patch(srcFile: String, patchFile: String): File = try {
+        val p = difflib.DiffUtils.parseUnifiedDiff(IO.readLines(baseDirectory.value / patchFile).asJava)
+        val r = difflib.DiffUtils.patch(IO.readLines(srcBase / srcFile).asJava, p)
+        val target = targetBase / srcFile
+        IO.writeLines(target, r.asScala)
+        target
+      } catch { case ex: Exception =>
+        streams.value.log.error(s"Error patching $srcFile: $ex")
+        throw ex
+      }
+      IO.createDirectory(targetBase)
+      Seq(
+        patch("BoxesRunTime.java", "boxes.patch"),
+        patch("ScalaRunTime.scala", "srt.patch")
+      )
+    }.taskValue
+  )
+
 // The scala version used by the benchmark suites, leave undefined to use the ambient version.")
 def benchmarkScalaVersion = System.getProperty("benchmark.scala.version", "")
 
@@ -703,9 +732,9 @@ lazy val test = project
     testOptions in IntegrationTest += Tests.Setup { () =>
       val cp = (dependencyClasspath in Test).value
       val baseDir = (baseDirectory in ThisBuild).value
-      // Copy code.jar and instrumented.jar (resolved in the otherwise unused scope "test") to the location where partest expects them
+      // Copy code.jar (resolved in the otherwise unused scope "test") and instrumented.jar (from specLib) to the location where partest expects them
       copyBootstrapJar(cp, baseDir, "test/files/codelib", "code")
-      copyBootstrapJar(cp, baseDir, "test/files/speclib", "instrumented")
+      IO.copyFile((packagedArtifact in (LocalProject("specLib"), Compile, packageBin)).value._2, baseDir / "test/files/speclib/instrumented.jar")
     },
     definedTests in IntegrationTest += new sbt.TestDefinition(
       "partest",

project/plugins.sbt

@@ -23,7 +23,8 @@ addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.1.15")
 
 libraryDependencies ++= Seq(
   "org.eclipse.jgit" % "org.eclipse.jgit" % "4.6.0.201612231935-r",
-  "org.slf4j" % "slf4j-nop" % "1.7.23"
+  "org.slf4j" % "slf4j-nop" % "1.7.23",
+  "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0"
 )
 
 concurrentRestrictions in Global := Seq(