GenIdea: Improved Scala 3 Support

main/core/src/eval/Evaluator.scala

@@ -664,10 +664,10 @@ object Evaluator {
       rawValues: Seq[Result[Any]],
       evaluated: Agg[Task[_]],
       transitive: Agg[Task[_]],
-      failing: MultiBiMap[Either[Task[_], Labelled[_]], Result.Failing[_]],
+      failing: MultiBiMap[Either[Task[_], Labelled[_]], mill.api.Result.Failing[_]],
       results: collection.Map[Task[_], Result[Any]]
   ) {
-    def values = rawValues.collect { case Result.Success(v) => v }
+    def values = rawValues.collect { case mill.api.Result.Success(v) => v }
   }
 
   def plan(rootModule: BaseModule, goals: Agg[Task[_]]) = {

scalalib/src/GenIdeaImpl.scala

@@ -8,9 +8,9 @@ import ammonite.runtime.SpecialClassLoader
 import coursier.core.compatibility.xmlParseDom
 import coursier.maven.Pom
 import coursier.{LocalRepositories, Repositories, Repository}
+import mill.Agg
 import mill.api.Ctx.{Home, Log}
-import mill.api.Strict.Agg
-import mill.api.{Loose, PathRef, Result, Strict}
+import mill.api.{PathRef, Result, Strict}
 import mill.define._
 import mill.eval.Evaluator
 import mill.modules.Util
@@ -149,7 +149,7 @@ case class GenIdeaImpl(
           case x: ScalaModule => x.scalaCompilerClasspath
           case _ =>
             T.task {
-              Loose.Agg.empty[PathRef]
+              Agg.empty[PathRef]
             }
         }
 
@@ -169,14 +169,13 @@ case class GenIdeaImpl(
         }
 
         val (scalacPluginsIvyDeps, allScalacOptions) = mod match {
-          case mod: ScalaModule =>
-            T.task {
-              mod.scalacPluginIvyDeps()
-            } -> T.task {
-              mod.allScalacOptions()
-            }
-          case _ => T.task(Loose.Agg[Dep]()) -> T.task(Seq())
+          case mod: ScalaModule => (
+              T.task(mod.scalacPluginIvyDeps()),
+              T.task(mod.allScalacOptions())
+            )
+          case _ => (T.task { Agg[Dep]() }, T.task { Seq() })
         }
+
         val scalacPluginDependencies = T.task {
           mod.resolveDeps(scalacPluginsIvyDeps)()
         }
@@ -194,19 +193,19 @@ case class GenIdeaImpl(
         }
 
         T.task {
-          val resolvedCp: Loose.Agg[Scoped[Path]] =
+          val resolvedCp: Agg[Scoped[Path]] =
             externalDependencies().map(_.path).map(Scoped(_, None)) ++
               extCompileIvyDeps()
                 .map(_.path)
                 .map(Scoped(_, Some("PROVIDED"))) ++
               extRunIvyDeps().map(_.path).map(Scoped(_, Some("RUNTIME")))
           // unused, but we want to trigger sources, to have them available (automatically)
           // TODO: make this a separate eval to handle resolve errors
-          val resolvedSrcs: Loose.Agg[PathRef] = externalSources()
-          val resolvedSp: Loose.Agg[PathRef] = scalacPluginDependencies()
-          val resolvedCompilerCp: Loose.Agg[PathRef] =
+          val resolvedSrcs: Agg[PathRef] = externalSources()
+          val resolvedSp: Agg[PathRef] = scalacPluginDependencies()
+          val resolvedCompilerCp: Agg[PathRef] =
             scalaCompilerClasspath()
-          val resolvedLibraryCp: Loose.Agg[PathRef] =
+          val resolvedLibraryCp: Agg[PathRef] =
             externalLibraryDependencies()
           val scalacOpts: Seq[String] = allScalacOptions()
           val resolvedFacets: Seq[JavaFacet] = facets()
@@ -232,22 +231,23 @@ case class GenIdeaImpl(
       }
     }
 
-    val resolved: Seq[ResolvedModule] =
+    val resolvedModules: Seq[ResolvedModule] =
       evalOrElse(evaluator, T.sequence(resolveTasks), Seq())
 
     val moduleLabels = modules.map(_.swap).toMap
 
     val allResolved: Seq[Path] =
-      (resolved.flatMap(_.classpath).map(_.value) ++ buildLibraryPaths ++ buildDepsPaths)
+      (resolvedModules.flatMap(_.classpath).map(_.value) ++ buildLibraryPaths ++ buildDepsPaths)
         .distinct
         .sorted
 
-    val librariesProperties = resolved
-      .flatMap(x => x.libraryClasspath.map(_ -> x.compilerClasspath))
-      .toMap
+    val librariesProperties: Map[Path, Agg[Path]] =
+      resolvedModules
+        .flatMap(x => x.libraryClasspath.map(_ -> x.compilerClasspath))
+        .toMap
 
     val (wholeFileConfigs, configFileContributions) =
-      resolved
+      resolvedModules
         .flatMap(_.configFileContributions)
         .partition(_.asWholeFile.isDefined)
 
@@ -308,8 +308,14 @@ case class GenIdeaImpl(
       .groupBy(_.last)
       .filter(_._2.size > 1)
       .view
+      .mapValues(_.sorted)
       .mapValues(_.zipWithIndex)
-      .flatMap(y => y._2.map(x => x._1 -> s"${y._1} (${x._2})"))
+      .flatMap(y =>
+        y._2.map {
+          case (path, 0) => path -> y._1
+          case (path, idx) => path -> s"${y._1} (${idx})"
+        }
+      )
       .toMap
 
     val pathToLibName = allResolved
@@ -408,8 +414,8 @@ case class GenIdeaImpl(
         .map(toResolvedJar)
         .collect { case Some(r) => r }
 
-    val compilerSettings = resolved
-      .foldLeft(Map[(Loose.Agg[os.Path], Seq[String]), Vector[JavaModule]]()) {
+    val compilerSettings = resolvedModules
+      .foldLeft(Map[(Agg[os.Path], Seq[String]), Vector[JavaModule]]()) {
         (r, q) =>
           val key = (q.pluginClasspath, q.scalaOptions)
           r + (key -> (r.getOrElse(key, Vector()) :+ q.module))
@@ -443,27 +449,40 @@ case class GenIdeaImpl(
 
     val libraries: Seq[(SubPath, Elem)] =
       resolvedLibraries(allResolved).flatMap { resolved =>
-        import resolved.path
         val names = libraryNames(resolved)
         val sources = resolved match {
           case CoursierResolved(_, _, s) => s
           case WithSourcesResolved(_, s) => s
           case OtherResolved(_) => None
         }
         for (name <- names)
-          yield Tuple2(
-            os.sub / "libraries" / s"${ideaifyLibraryName(name)}.xml",
-            libraryXmlTemplate(
-              name = name,
-              path = path,
-              sources = sources,
-              scalaCompilerClassPath =
-                librariesProperties.getOrElse(path, Loose.Agg.empty)
+          yield {
+            val compilerCp: Agg[Path] = librariesProperties.getOrElse(resolved.path, Agg.empty)
+            val languageLevel = name match {
+              case _ if compilerCp.iterator.isEmpty => None
+              case _ if name.startsWith("scala3-library_3-3.0.") => Some("Scala_3_0")
+              case _ if name.startsWith("scala-library-2.13.") => Some("Scala_2_13")
+              case _ if name.startsWith("scala-library-2.12.") => Some("Scala_2_12")
+              case _ if name.startsWith("scala-library-2.11.") => Some("Scala_2_11")
+              case _ if name.startsWith("scala-library-2.10.") => Some("Scala_2_10")
+              case _ if name.startsWith("scala-library-2.9.") => Some("Scala_2_9")
+              case _ if name.startsWith("dotty-library-0.27") => Some("Scala_0_27")
+              case _ => None
+            }
+            Tuple2(
+              os.sub / "libraries" / s"${ideaifyLibraryName(name)}.xml",
+              libraryXmlTemplate(
+                name = name,
+                path = resolved.path,
+                sources = sources,
+                scalaCompilerClassPath = compilerCp,
+                languageLevel = languageLevel
+              )
             )
-          )
+          }
       }
 
-    val moduleFiles: Seq[(SubPath, Elem)] = resolved.map {
+    val moduleFiles: Seq[(SubPath, Elem)] = resolvedModules.map {
       case ResolvedModule(
             path,
             resolvedDeps,
@@ -704,17 +723,23 @@ case class GenIdeaImpl(
       name: String,
       path: os.Path,
       sources: Option[os.Path],
-      scalaCompilerClassPath: Loose.Agg[Path]
+      scalaCompilerClassPath: Agg[Path],
+      languageLevel: Option[String]
   ): Elem = {
     val isScalaLibrary = scalaCompilerClassPath.iterator.nonEmpty
     <component name="libraryTable">
       <library name={name} type={if (isScalaLibrary) "Scala" else null}>
         {
       if (isScalaLibrary) {
         <properties>
-          <compiler-classpath>
+        {
+          if (languageLevel.isDefined) <language-level>{languageLevel.get}</language-level>
+        }
+        <compiler-classpath>
             {
-          scalaCompilerClassPath.toList.sortBy(_.wrapped).map(p => <root url={relativeFileUrl(p)}/>)
+          scalaCompilerClassPath.iterator.toSeq.sortBy(_.wrapped).map(p =>
+            <root url={relativeFileUrl(p)}/>
+          )
         }
           </compiler-classpath>
         </properties>
@@ -820,7 +845,7 @@ case class GenIdeaImpl(
     </module>
   }
   def scalaCompilerTemplate(
-      settings: Map[(Loose.Agg[os.Path], Seq[String]), Seq[JavaModule]]
+      settings: Map[(Agg[os.Path], Seq[String]), Seq[JavaModule]]
   ) = {
 
     <project version={"" + ideaConfigVersion}>
@@ -904,12 +929,12 @@ object GenIdeaImpl {
 
   final case class ResolvedModule(
       path: Segments,
-      classpath: Loose.Agg[Scoped[Path]],
+      classpath: Agg[Scoped[Path]],
       module: JavaModule,
-      pluginClasspath: Loose.Agg[Path],
+      pluginClasspath: Agg[Path],
       scalaOptions: Seq[String],
-      compilerClasspath: Loose.Agg[Path],
-      libraryClasspath: Loose.Agg[Path],
+      compilerClasspath: Agg[Path],
+      libraryClasspath: Agg[Path],
       facets: Seq[JavaFacet],
       configFileContributions: Seq[IdeaConfigFile],
       compilerOutput: Path

scalalib/test/resources/gen-idea-extended-hello-world/build.sc

@@ -5,11 +5,15 @@ import mill.scalalib.GenIdeaModule._
 import mill.scalalib.TestModule
 
 trait HelloWorldModule extends scalalib.ScalaModule {
-  def scalaVersion = "2.12.4"
+  override def scalaVersion = "2.13.6"
   object test extends super.Tests with TestModule.Utest
 
-  def generatedSources = T {
-    Seq(PathRef(T.ctx().dest / "classes"))
+  override def generatedSources = T {
+    Seq(PathRef(T.dest / "classes"))
+  }
+
+  object subScala3 extends scalalib.ScalaModule {
+    override def scalaVersion = "3.0.2"
   }
 
   def ideaJavaModuleFacets(ideaConfigVersion: Int): Command[Seq[JavaFacet]] =

scalalib/test/resources/gen-idea-extended-hello-world/idea/libraries/scala_library_2_12_4_jar.xml → scalalib/test/resources/gen-idea-extended-hello-world/idea/libraries/scala_library_2_13_6_jar.xml

@@ -1,18 +1,20 @@
 <component name="libraryTable">
-    <library name="scala-library-2.12.4.jar" type="Scala">
+    <library name="scala-library-2.13.6.jar" type="Scala">
         <properties>
+            <language-level>Scala_2_13</language-level>
             <compiler-classpath>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.0.6/scala-xml_2.12-1.0.6.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.4/scala-compiler-2.12.4.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.4/scala-library-2.12.4.jar"/>
-                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.12.4/scala-reflect-2.12.4.jar"/>
+                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/net/java/dev/jna/jna/5.3.1/jna-5.3.1.jar"/>
+                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/jline/jline/3.19.0/jline-3.19.0.jar"/>
+                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.13.6/scala-compiler-2.13.6.jar"/>
+                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar"/>
+                <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-reflect/2.13.6/scala-reflect-2.13.6.jar"/>
             </compiler-classpath>
         </properties>
         <CLASSES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.4/scala-library-2.12.4.jar!/"/>
+            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar!/"/>
         </CLASSES>
         <SOURCES>
-            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.12.4/scala-library-2.12.4-sources.jar!/"/>
+            <root url="jar://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6-sources.jar!/"/>
         </SOURCES>
     </library>
 </component>

scalalib/test/resources/gen-idea-extended-hello-world/idea/mill_modules/helloworld.iml

@@ -13,7 +13,7 @@
         </content>
         <orderEntry type="inheritedJdk"/>
         <orderEntry type="sourceFolder" forTests="false"/>
-        <orderEntry type="library" name="scala-library-2.12.4.jar" level="project"/>
+        <orderEntry type="library" name="scala-library-2.13.6.jar" level="project"/>
     </component>
     <component name="FacetManager">
         <facet type="AspectJ" name="AspectJ">

scalalib/test/resources/gen-idea-extended-hello-world/idea/mill_modules/helloworld.subscala3.iml

@@ -0,0 +1,16 @@
+<module type="JAVA_MODULE" version="4">
+    <component name="NewModuleRootManager">
+        <output url="file://$MODULE_DIR$/../../out/HelloWorld/subScala3/ideaCompileOutput/dest/classes"/>
+        <exclude-output/>
+        <content url="file://$MODULE_DIR$/../../HelloWorld/subScala3/src">
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/subScala3/src" isTestSource="false"/>
+        </content>
+        <content url="file://$MODULE_DIR$/../../HelloWorld/subScala3/resources">
+            <sourceFolder url="file://$MODULE_DIR$/../../HelloWorld/subScala3/resources" type="java-resource"/>
+        </content>
+        <orderEntry type="inheritedJdk"/>
+        <orderEntry type="sourceFolder" forTests="false"/>
+        <orderEntry type="library" name="scala-library-2.13.6.jar" level="project"/>
+        <orderEntry type="library" name="scala3-library_3-3.0.2.jar" level="project"/>
+    </component>
+</module>

scalalib/test/resources/gen-idea-extended-hello-world/idea/mill_modules/helloworld.test.iml

@@ -10,7 +10,7 @@
         </content>
         <orderEntry type="inheritedJdk"/>
         <orderEntry type="sourceFolder" forTests="false"/>
-        <orderEntry type="library" name="scala-library-2.12.4.jar" level="project"/>
+        <orderEntry type="library" name="scala-library-2.13.6.jar" level="project"/>
         <orderEntry type="module" module-name="helloworld" exported=""/>
     </component>
 </module>

scalalib/test/resources/gen-idea-extended-hello-world/idea/modules.xml

@@ -3,6 +3,7 @@
         <modules>
             <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/mill-build.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/mill-build.iml"/>
             <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloworld.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloworld.iml"/>
+            <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloworld.subscala3.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloworld.subscala3.iml"/>
             <module fileurl="file://$PROJECT_DIR$/.idea/mill_modules/helloworld.test.iml" filepath="$PROJECT_DIR$/.idea/mill_modules/helloworld.test.iml"/>
         </modules>
     </component>

scalalib/test/resources/gen-idea-hello-world/idea/libraries/scala_library_2_12_4_jar.xml

@@ -1,6 +1,7 @@
 <component name="libraryTable">
     <library name="scala-library-2.12.4.jar" type="Scala">
         <properties>
+            <language-level>Scala_2_12</language-level>
             <compiler-classpath>
                 <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/modules/scala-xml_2.12/1.0.6/scala-xml_2.12-1.0.6.jar"/>
                 <root url="file://COURSIER_HOME/https/repo1.maven.org/maven2/org/scala-lang/scala-compiler/2.12.4/scala-compiler-2.12.4.jar"/>

scalalib/test/src/GenIdeaExtendedTests.scala

@@ -1,5 +1,7 @@
 package mill.scalalib
 
+import scala.util.Try
+
 import mill.util.ScriptTestSuite
 import os.Path
 import utest._
@@ -16,24 +18,26 @@ object GenIdeaExtendedTests extends ScriptTestSuite(false) {
       val workspacePath = initWorkspace()
       eval("mill.scalalib.GenIdea/idea")
 
-      Seq(
+      val checks = Seq(
         os.sub / "mill_modules" / "helloworld.iml",
         os.sub / "mill_modules" / "helloworld.test.iml",
+        os.sub / "mill_modules" / "helloworld.subscala3.iml",
         os.sub / "mill_modules" / "mill-build.iml",
-        os.sub / "libraries" / "scala_library_2_12_4_jar.xml",
+        os.sub / "libraries" / "scala_library_2_13_6_jar.xml",
         os.sub / "modules.xml",
         os.sub / "misc.xml",
         os.sub / "compiler.xml"
-      ).foreach { resource =>
-        GenIdeaTests.assertIdeaXmlResourceMatchesFile(
-          workspaceSlug,
-          workspacePath,
-          resource
-        )
+      ).map { resource =>
+        Try {
+          GenIdeaTests.assertIdeaXmlResourceMatchesFile(
+            workspaceSlug,
+            workspacePath,
+            resource
+          )
+        }
       }
+      assert(checks.forall(_.isSuccess))
     }
   }
 
-
-
 }