Switch to Scala 3 by default

.github/workflows/ci.yml

@@ -186,24 +186,6 @@ jobs:
     - name: Check examples
       run: bash ./scala-cli --jvm temurin:17  .github/scripts/check_examples.sc
 
-  migration-tests:
-    timeout-minutes: 120
-    runs-on: "ubuntu-latest"
-    steps:
-    - uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        submodules: true
-    - uses: coursier/cache-action@v6.3
-    - uses: VirtusLab/scala-cli-setup@267af2f1ed4911180b4bb25619ca4a586753cbd1
-      with:
-        jvm: "temurin:17"
-    - name: Unit 3.x tests
-      run: |
-        ./mill -i cli3.compile
-        ./mill -i cli3.test
-        ./mill -i _[3.1.1].test
-
   checks:
     timeout-minutes: 15
     runs-on: ubuntu-latest

build.sc

@@ -34,9 +34,11 @@ import _root_.scala.util.Properties
 implicit def millModuleBasePath: define.BasePath =
   define.BasePath(super.millModuleBasePath.value / "modules")
 
-object cli extends Cli
-// remove once migrate to Scala 3
-object cli3           extends Cli3
+object cli extends Cli3
+
+// remove once we do not have blockers with Scala 3
+object cli2 extends Cli
+
 object `cli-options`  extends CliOptions
 object `build-macros` extends Cross[BuildMacros](Scala.defaultInternal, Scala.scala3)
 object options        extends Cross[Options](Scala.defaultInternal, Scala.scala3)
@@ -134,7 +136,7 @@ object packager extends ScalaModule with Bloop.Module {
 }
 
 object `generate-reference-doc` extends SbtModule with ScalaCliScalafixModule {
-  def scalaVersion = Scala.defaultInternal
+  def scalaVersion = Scala.scala3
   def scalacOptions = T {
     super.scalacOptions() ++ Seq("-Ywarn-unused")
   }
@@ -653,7 +655,7 @@ trait Cli3 extends Cli {
       mainArgs = Seq(cache.toNIO.toString, classpath),
       workingDir = os.pwd
     )
-    val cp = res.out.text
+    val cp = res.out.lines.head
     cp.split(File.pathSeparator).toSeq.map(p => mill.PathRef(os.Path(p)))
   }
 }

modules/cli-options/src/main/scala/scala/cli/doc/InternalDocOptions.scala

@@ -0,0 +1,16 @@
+package scala.cli.doc
+
+import caseapp._
+
+final case class InternalDocOptions(
+  outputDir: String = "website/docs/reference",
+  check: Boolean = false
+) {
+  lazy val outputPath: os.Path =
+    os.Path(outputDir, os.pwd)
+}
+
+object InternalDocOptions {
+  implicit lazy val parser: Parser[InternalDocOptions] = Parser.derive
+  implicit lazy val help: Help[InternalDocOptions]     = Help.derive
+}

modules/generate-reference-doc/src/main/scala/scala/cli/doc/GenerateReferenceDoc.scala

@@ -16,7 +16,7 @@ import scala.build.preprocessing.directives.{
 }
 import scala.cli.ScalaCliCommands
 
-object GenerateReferenceDoc extends CaseApp[Options] {
+object GenerateReferenceDoc extends CaseApp[InternalDocOptions] {
 
   private def cleanUpOrigin(origin: String): String = {
     val origin0      = origin.takeWhile(_ != '[').stripSuffix("Options")
@@ -289,7 +289,7 @@ object GenerateReferenceDoc extends CaseApp[Options] {
     b.toString
   }
 
-  def run(options: Options, args: RemainingArgs): Unit = {
+  def run(options: InternalDocOptions, args: RemainingArgs): Unit = {
 
     val scalaCli      = new ScalaCliCommands("scala-cli", isSipScala = false)
     val commands      = scalaCli.commands