Create shaded JLine in sbt build

Reusing parts of #4593, this commits adds two additional subprojects to
the sbt build:

- repl-jline, which is already used by the ant build, builds the part of
  the REPL that depends on JLine. The actual JLine depenency is moved to
  this project.

- repl-jline-shaded uses JarJar to create a shaded version of repl-jline
  and jline.jar.

Unlike the ant build, this setup does not use any circular dependencies.
dist/mkBin puts all of quick/repl, quick/repl-jline and
quick/repl-jline-shaded onto the classpath of build-sbt/quick/bin/scala.
A future addition to the sbt build for building build-sbt/pack will have
to put the generated classfiles into the correct JARs, mirroring the old
structure.

2 files changed, 86 insertions, 1 deletions

diff --git a/project/JarJar.scala b/project/JarJar.scala
new file mode 100644
index 0000000000..64281f23c1
--- /dev/null
+++ b/project/JarJar.scala
@@ -0,0 +1,83 @@
+import org.pantsbuild.jarjar
+import org.pantsbuild.jarjar._
+import org.pantsbuild.jarjar.util._
+import scala.collection.JavaConverters._
+import java.util.jar._
+import java.io._
+import sbt._
+
+object JarJar {
+  sealed abstract class JarJarConfig {
+    def toPatternElement: PatternElement
+  }
+  object JarJarConfig {
+    case class Rule(pattern: String, result: String) extends JarJarConfig {
+      def toPatternElement: PatternElement = {
+        val rule = new jarjar.Rule
+        rule.setPattern(pattern)
+        rule.setResult(result)
+        rule
+      }
+    }
+    case class Keep(pattern: String) extends JarJarConfig {
+      def toPatternElement: PatternElement = {
+        val keep = new jarjar.Keep
+        keep.setPattern(pattern)
+        keep
+      }
+    }
+  }
+
+  sealed abstract class Entry {
+    def name: String
+    def time: Long
+    def data: Array[Byte]
+  }
+
+  case class JarEntryInput(jarFile: JarFile, entry: JarEntry) extends Entry {
+    def name = entry.getName
+    def time = entry.getTime
+    def data = sbt.IO.readBytes(jarFile.getInputStream(entry))
+  }
+  case class FileInput(base: File, file: File) extends Entry {
+    def name = file.relativeTo(base).get.getPath
+    def time = file.lastModified
+    def data = sbt.IO.readBytes(file)
+  }
+
+  private def newMainProcessor(patterns: java.util.List[PatternElement], verbose: Boolean, skipManifest: Boolean): JarProcessor = {
+    val cls = Class.forName("org.pantsbuild.jarjar.MainProcessor")
+    val constructor = cls.getConstructor(classOf[java.util.List[_]], java.lang.Boolean.TYPE, java.lang.Boolean.TYPE)
+    constructor.setAccessible(true)
+    constructor.newInstance(patterns, Boolean.box(verbose), Boolean.box(skipManifest)).asInstanceOf[JarProcessor]
+  }
+
+  def apply(in: Iterator[Entry], outdir: File,
+            config: Seq[JarJarConfig], verbose: Boolean = false): Seq[File] = {
+    val patterns = config.map(_.toPatternElement).asJava
+    val processor: JarProcessor = newMainProcessor(patterns, verbose, false)
+    def process(e: Entry): Option[File] = {
+      val struct = new EntryStruct()
+      struct.name = e.name
+      struct.time = e.time
+      struct.data = e.data
+      if (processor.process(struct)) {
+        if (struct.name.endsWith("/")) None
+        else {
+          val f = outdir / struct.name
+          try {
+            f.getParentFile.mkdirs()
+            sbt.IO.write(f, struct.data)
+          } catch {
+            case ex: Exception =>
+              throw new IOException(s"Failed to write ${e.name} / ${f.getParentFile} / ${f.getParentFile.exists}", ex)
+          }
+          Some(f)
+        }
+      }
+      else None
+    }
+    in.flatMap(entry => process(entry)).toList
+
+  }
+}
diff --git a/project/plugins.sbt b/project/plugins.sbt
index dc266a8db1..862887d57f 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1 +1,3 @@
-libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.3.2"
\ No newline at end of file
+libraryDependencies += "org.apache.commons" % "commons-lang3" % "3.3.2"
+
+libraryDependencies += "org.pantsbuild" % "jarjar" % "1.6.0"