Mill support for Chisel3 (#1035)

Co-Authored-By: Jack Koenig <jack.koenig3@gmail.com>
Co-Authored-By: Jim Lawson <ucbjrl@berkeley.edu>

1 files changed, 94 insertions, 0 deletions

diff --git a/CommonBuild.sc b/CommonBuild.sc
new file mode 100644
index 00000000..a9a4e1a2
--- /dev/null
+++ b/CommonBuild.sc
@@ -0,0 +1,94 @@
+import ammonite.ops._
+import mill._
+import mill.scalalib._
+
+def scalacOptionsVersion(scalaVersion: String): Seq[String] = {
+  Seq() ++ {
+    // If we're building with Scala > 2.11, enable the compile option
+    //  switch to support our anonymous Bundle definitions:
+    //  https://github.com/scala/bug/issues/10047
+    if (scalaVersion.startsWith("2.11.")) {
+      Seq()
+    } else {
+      Seq(
+        "-Xsource:2.11",
+        "-Ywarn-unused:imports",
+        "-Ywarn-unused:locals"
+      )
+    }
+  }
+}
+
+def javacOptionsVersion(scalaVersion: String): Seq[String] = {
+  Seq() ++ {
+    // Scala 2.12 requires Java 8. We continue to generate
+    //  Java 7 compatible code for Scala 2.11
+    //  for compatibility with old clients.
+    if (scalaVersion.startsWith("2.11.")) {
+      Seq("-source", "1.7", "-target", "1.7")
+    } else {
+      Seq("-source", "1.8", "-target", "1.8")
+    }
+  }
+}
+
+// Define our own BuildInfo since mill doesn't currently have one.
+trait BuildInfo extends ScalaModule { outer =>
+
+  def buildInfoObjectName: String = "BuildInfo"
+
+  def buildInfoMembers: T[Map[String, String]] = T {
+    Map.empty[String, String]
+  }
+
+  private def generateBuildInfo(outputPath: Path, members: Map[String, String]) = {
+    val outputFile = outputPath / "BuildInfo.scala"
+    val packageName = members.getOrElse("buildInfoPackage", "")
+    val packageDef = if (packageName != "") {
+      s"package ${packageName}"
+    } else {
+      ""
+    }
+    val internalMembers =
+      members
+        .map {
+          case (name, value) => s"""  val ${name}: String = "${value}""""
+        }
+        .mkString("\n")
+    write(outputFile,
+      s"""
+         |${packageDef}
+         |case object ${buildInfoObjectName}{
+         |$internalMembers
+         |  override val toString: String = {
+         |    "buildInfoPackage: %s, version: %s, scalaVersion: %s" format (
+         |        buildInfoPackage, version, scalaVersion
+         |    )
+         |  }
+         |}
+       """.stripMargin)
+    outputPath
+  }
+
+  override def generatedSources = T {
+    super.generatedSources() :+ PathRef(generateBuildInfo(T.ctx().dest, buildInfoMembers()))
+  }
+}
+
+// Define some file filters to exclude unwanted files from created jars.
+type JarFileFilter = (Path, RelPath) => Boolean
+// Exclude any `.DS_Store` files
+val noDS_StoreFiles: JarFileFilter = (p: Path, relPath: RelPath) => {
+  relPath.last != ".DS_Store"
+}
+
+// Exclude non-source files - accept all resource files, but only *.{java,scala} from source paths
+val onlySourceFiles: JarFileFilter = (p: Path, relPath: RelPath) => {
+  p.last == "resources" || (relPath.ext == "scala" || relPath.ext == "java")
+}
+
+// Apply a sequence of file filters - only accept files which satisfy all filters.
+// We expect this to be curried, the resulting file filter passed to createJar()
+def forallFilters(fileFilters: Seq[JarFileFilter])(p: Path, relPath: RelPath): Boolean = {
+  fileFilters.forall(f => f(p, relPath))
+}