1 files changed, 101 insertions, 0 deletions
diff --git a/scalalib/src/MiscModule.scala b/scalalib/src/MiscModule.scala
new file mode 100644
index 00000000..c6449d6e
--- /dev/null
+++ b/scalalib/src/MiscModule.scala
@@ -0,0 +1,101 @@
+package mill
+package scalalib
+
+import mill.define.Cross.Resolver
+import mill.define.{Cross, Task}
+import mill.eval.{PathRef, Result}
+import mill.util.Loose.Agg
+object CrossModuleBase{
+  def scalaVersionPaths(scalaVersion: String, f: String => os.Path) = {
+    for(segments <- scalaVersion.split('.').inits.filter(_.nonEmpty))
+    yield PathRef(f(segments.mkString(".")))
+  }
+}
+trait CrossModuleBase extends ScalaModule {
+  def crossScalaVersion: String
+  def scalaVersion = T{ crossScalaVersion }
+
+  override def millSourcePath = super.millSourcePath / ammonite.ops.up
+  implicit def crossSbtModuleResolver: Resolver[CrossModuleBase] = new Resolver[CrossModuleBase]{
+    def resolve[V <: CrossModuleBase](c: Cross[V]): V = {
+      crossScalaVersion.split('.')
+        .inits
+        .takeWhile(_.length > 1)
+        .flatMap( prefix =>
+          c.items.map(_._2).find(_.crossScalaVersion.split('.').startsWith(prefix))
+        )
+        .collectFirst{case x => x}
+        .getOrElse(
+          throw new Exception(
+            s"Unable to find compatible cross version between $crossScalaVersion and "+
+              c.items.map(_._2.crossScalaVersion).mkString(",")
+          )
+        )
+    }
+  }
+}
+
+trait CrossScalaModule extends ScalaModule with CrossModuleBase{ outer =>
+    override def sources = T.sources{
+    super.sources() ++
+    CrossModuleBase.scalaVersionPaths(crossScalaVersion, s => millSourcePath / s"src-$s" )
+  }
+
+  trait Tests extends super.Tests {
+    override def sources = T.sources{
+      super.sources() ++
+      CrossModuleBase.scalaVersionPaths(crossScalaVersion, s => millSourcePath / s"src-$s" )
+    }
+  }
+}
+
+trait MavenTests extends TestModule{
+  override def sources = T.sources(
+    millSourcePath / 'src / 'test / 'scala,
+    millSourcePath / 'src / 'test / 'java
+  )
+  override def resources = T.sources{ millSourcePath / 'src / 'test / 'resources }
+}
+trait MavenModule extends JavaModule{outer =>
+
+  override def sources = T.sources(
+    millSourcePath / 'src / 'main / 'scala,
+    millSourcePath / 'src / 'main / 'java
+  )
+  override def resources = T.sources{ millSourcePath / 'src / 'main / 'resources }
+  trait Tests extends super.Tests with MavenTests {
+    override def millSourcePath = outer.millSourcePath
+    override def intellijModulePath = outer.millSourcePath / 'src / 'test
+  }
+}
+
+trait SbtModule extends MavenModule with ScalaModule{ outer =>
+  trait Tests extends super.Tests with MavenTests {
+    override def millSourcePath = outer.millSourcePath
+    override def intellijModulePath = outer.millSourcePath / 'src / 'test
+  }
+}
+
+trait CrossSbtModule extends SbtModule with CrossModuleBase{ outer =>
+
+  override def sources = T.sources{
+    super.sources() ++
+    CrossModuleBase.scalaVersionPaths(
+      crossScalaVersion,
+      s => millSourcePath / 'src / 'main / s"scala-$s"
+    )
+
+  }
+  trait Tests extends super.Tests {
+    override def millSourcePath = outer.millSourcePath
+    override def sources = T.sources{
+      super.sources() ++
+      CrossModuleBase.scalaVersionPaths(
+        crossScalaVersion,
+        s => millSourcePath / 'src / 'test / s"scala-$s"
+      )
+    }
+  }
+}
+
+