Add support for Dotty projects (#397)

* Abstract over the scala compiler organization

* Support using a locally published compiler

Publishing locally with sbt means publishing ivy-style, which uses
a different naming convention than maven, we now handle both cases.

* Add minimal support for Dotty projects

* Rewrite scalalib.Dep, introduce scalalib.CrossVersion

Instead of Dep being a trait with three cases (Java/Scala/Point), it is
now a case class where the cross field is an instance of the
CrossVersion trait which has three cases (Constant/Binary/Full). This is
more versatile since it allows for non-empty constant suffixes which
will be used to implement withDottyCompat in the next commit. It's
also a cleaner separation of concerns. We also deduplicate various
pieces of codes that computed the artifact name: this is now always handled in
Dep and CrossVersion.

* Add simple way to use Scala 2 deps in a Dotty project

This is similar to the withDottyCompat method in the sbt-dotty plugin.

* Turn off the Dotty test on Java >= 9

1 files changed, 3 insertions, 1 deletions

diff --git a/scalanativelib/src/mill/scalanativelib/ScalaNativeModule.scala b/scalanativelib/src/mill/scalanativelib/ScalaNativeModule.scala
index 8613c42f..d3cde4d1 100644
--- a/scalanativelib/src/mill/scalanativelib/ScalaNativeModule.scala
+++ b/scalanativelib/src/mill/scalanativelib/ScalaNativeModule.scala
@@ -47,6 +47,7 @@ trait ScalaNativeModule extends ScalaModule { outer =>
 
   trait Tests extends TestScalaNativeModule {
     override def scalaWorker = outer.scalaWorker
+    override def scalaOrganization = outer.scalaOrganization()
     override def scalaVersion = outer.scalaVersion()
     override def scalaNativeVersion = outer.scalaNativeVersion()
     override def releaseMode = outer.releaseMode()
@@ -223,7 +224,7 @@ trait TestScalaNativeModule extends ScalaNativeModule with TestModule { testOute
     Lib.resolveDependencies(
       repositories,
       Lib.depToDependency(_, scalaVersion(), ""),
-      transitiveIvyDeps().collect{ case x: Dep.Scala => x }.filter(d => supportedTestFrameworks(d.dep.module.name))
+      transitiveIvyDeps().filter(d => d.cross.isBinary && supportedTestFrameworks(d.dep.module.name))
     )
   }
 
@@ -238,6 +239,7 @@ trait TestScalaNativeModule extends ScalaNativeModule with TestModule { testOute
   // which knows the names of all the tests and references to invoke them
   object testRunnerNative extends ScalaNativeModule {
     override def scalaWorker = testOuter.scalaWorker
+    override def scalaOrganization = testOuter.scalaOrganization()
     override def scalaVersion = testOuter.scalaVersion()
     override def scalaNativeVersion = testOuter.scalaNativeVersion()
     override def moduleDeps = Seq(testOuter)