Mill support (#1368)

2 files changed, 127 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 94a12c29..cba5aa46 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,9 +53,11 @@ src_managed/
 project/boot/
 project/plugins/project/
 .idea/
+.idea_modules/
 gen/
 project/project/
 /bin/
+out/
 
 *~
 *#*#
diff --git a/build.sc b/build.sc
new file mode 100644
index 00000000..db782b37
--- /dev/null
+++ b/build.sc
@@ -0,0 +1,125 @@
+// Build script for mill 0.6.0
+import mill._
+import mill.scalalib._
+import mill.scalalib.publish._
+import mill.modules.Util
+
+object firrtl extends mill.Cross[firrtlCrossModule]("2.11.12", "2.12.10")
+
+class firrtlCrossModule(crossVersion: String) extends ScalaModule with SbtModule with PublishModule {
+  // different scala version shares same sources
+  // mill use foo/2.11.12 foo/2.12.10 as millSourcePath by default
+  override def millSourcePath = super.millSourcePath / os.up / os.up
+
+  def scalaVersion = crossVersion
+
+  // 2.12.10 -> Array("2", "12", "10") -> "12" -> 12
+  private def majorVersion = crossVersion.split('.')(1).toInt
+
+  def publishVersion = "1.3-SNAPSHOT"
+
+  def antlr4Version = "4.7.1"
+
+  def protocVersion = "3.5.1"
+
+  def mainClass = Some("firrtl.stage.FirrtlMain")
+  
+  private def scalacCrossOptions = majorVersion match {
+    case i if i < 12 => Seq()
+    case _ => Seq("-Xsource:2.11")
+  }
+
+  private def javacCrossOptions = majorVersion match {
+    case i if i < 12 => Seq("-source", "1.7", "-target", "1.7")
+    case _ => Seq("-source", "1.8", "-target", "1.8")
+  }
+
+  override def scalacOptions = super.scalacOptions() ++ Seq(
+    "-deprecation",
+    "-unchecked",
+    "-Yrangepos", // required by SemanticDB compiler plugin
+  ) ++ scalacCrossOptions
+  
+  override def javacOptions = super.javacOptions() ++ javacCrossOptions
+
+  override def ivyDeps = super.ivyDeps() ++ Agg(
+    ivy"${scalaOrganization()}:scala-reflect:${scalaVersion()}",
+    ivy"com.github.scopt::scopt:3.7.1",
+    ivy"net.jcazevedo::moultingyaml:0.4.1",
+    ivy"org.json4s::json4s-native:3.6.7",
+    ivy"org.apache.commons:commons-text:1.7",
+    ivy"org.antlr:antlr4-runtime:4.7.1",
+    ivy"com.google.protobuf:protobuf-java:3.5.1"
+  )
+  
+  object test extends Tests {
+    private def ivyCrossDeps = majorVersion match {
+      case i if i < 12 => Agg(ivy"junit:junit:4.12")
+      case _ => Agg()
+    }
+
+    def ivyDeps = Agg(
+      ivy"org.scalatest::scalatest:3.0.8",
+      ivy"org.scalacheck::scalacheck:1.14.0"
+    ) ++ ivyCrossDeps
+
+    def testFrameworks = Seq("org.scalatest.tools.Framework")
+  }
+
+  override def generatedSources = T {
+    generatedAntlr4Source() ++ generatedProtoSources()
+  }
+
+  /** antlr4 */
+
+  def antlrSource = T.source {
+    millSourcePath / 'src / 'main / 'antlr4 / "FIRRTL.g4"
+  }
+
+  def downloadAntlr4Jar = T {
+    Util.download(s"https://www.antlr.org/download/antlr-$antlr4Version-complete.jar")
+  }
+
+  def generatedAntlr4Source = T.sources {
+    os.proc("java",
+      "-jar", downloadAntlr4Jar().path.toString,
+      "-o", T.ctx.dest.toString,
+      "-lib", antlrSource().path.toString,
+      "-package", "firrtl.antlr",
+      "-no-listener", "-visitor",
+      antlrSource().path.toString
+    ).call()
+    T.ctx.dest
+  }
+
+  /** protoc */
+
+  def protobufSource = T.source {
+    millSourcePath / 'src / 'main / 'proto / "firrtl.proto"
+  }
+
+  def downloadProtocJar = T {
+    Util.download(s"https://repo.maven.apache.org/maven2/com/github/os72/protoc-jar/$protocVersion/protoc-jar-$protocVersion.jar")
+  }
+
+  def generatedProtoSources = T.sources {
+    os.proc("java",
+      "-jar", downloadProtocJar().path.toString,
+      "-I", protobufSource().path / os.up,
+      s"--java_out=${T.ctx.dest.toString}",
+      protobufSource().path.toString()
+    ).call()
+    T.ctx.dest / "firrtl"
+  }
+
+  def pomSettings = PomSettings(
+    description = artifactName(),
+    organization = "edu.berkeley.cs",
+    url = "https://github.com/freechipsproject/firrtl",
+    licenses = Seq(License.`BSD-3-Clause`),
+    versionControl = VersionControl.github("freechipsproject", "firrtl"),
+    developers = Seq(
+      Developer("jackbackrack", "Jonathan Bachrach", "https://eecs.berkeley.edu/~jrb/")
+    )
+  )
+}