From 38f54490843957c8ff29c947419034f612490ab2 Mon Sep 17 00:00:00 2001
From: xuwei-k <6b656e6a69@gmail.com>
Date: Tue, 16 Nov 2021 10:19:26 +0900
Subject: [PATCH] Update build settings for Scala 3

---
 build.sbt                      | 25 +++++++++++++++++++------
 project/Dependencies.scala     | 24 +++++++++++++++++++++---
 project/HouseRulesPlugin.scala |  5 +++++
 3 files changed, 45 insertions(+), 9 deletions(-)

diff --git a/build.sbt b/build.sbt
index 72c80254b..e8c0a5d3b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -102,8 +102,15 @@ def commonBaseSettings: Seq[Setting[_]] = Def.settings(
   run / fork := true,
 )
 def commonSettings: Seq[Setting[_]] =
-  commonBaseSettings :+
-    addCompilerPlugin(kindProjector)
+  commonBaseSettings :+ {
+    libraryDependencies ++= {
+      if (scalaBinaryVersion.value == "3") {
+        Nil
+      } else {
+        Seq(compilerPlugin(kindProjector))
+      }
+    }
+  }
 def utilCommonSettings: Seq[Setting[_]] =
   baseSettings :+ (crossScalaVersions := (scala212 :: scala213 :: Nil))
 
@@ -463,7 +470,7 @@ lazy val utilScripted = (project in file("internal") / "util-scripted")
   .settings(
     utilCommonSettings,
     name := "Util Scripted",
-    libraryDependencies += scalaParsers,
+    libraryDependencies += scalaParsers.value,
     utilMimaSettings,
   )
   .configure(addSbtIO)
@@ -477,7 +484,7 @@ lazy val testingProj = (project in file("testing"))
     baseSettings,
     name := "Testing",
     libraryDependencies ++= Seq(
-      scalaXml,
+      scalaXml.value,
       testInterface,
       launcherInterface,
       sjsonNewScalaJson.value
@@ -803,7 +810,13 @@ lazy val coreMacrosProj = (project in file("core-macros"))
   .settings(
     baseSettings :+ (crossScalaVersions := (scala212 :: scala213 :: Nil)),
     name := "Core Macros",
-    libraryDependencies += "org.scala-lang" % "scala-compiler" % scalaVersion.value,
+    libraryDependencies += {
+      if (scalaBinaryVersion.value == "3") {
+        "org.scala-lang" % "scala-compiler" % scala213
+      } else {
+        "org.scala-lang" % "scala-compiler" % scalaVersion.value
+      }
+    },
     SettingKey[Boolean]("exportPipelining") := false,
     mimaSettings,
   )
@@ -913,7 +926,7 @@ lazy val mainProj = (project in file("main"))
       }
     },
     libraryDependencies ++=
-      (Seq(scalaXml, launcherInterface, caffeine, lmCoursierShaded) ++ log4jModules),
+      (Seq(scalaXml.value, launcherInterface, caffeine, lmCoursierShaded) ++ log4jModules),
     libraryDependencies ++= (scalaVersion.value match {
       case v if v.startsWith("2.12.") => List()
       case _                          => List(scalaPar)
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 42afc3136..aa9948bfc 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -100,9 +100,27 @@ object Dependencies {
   val scalaVerify = "com.eed3si9n.verify" %% "verify" % "1.0.0"
   val templateResolverApi = "org.scala-sbt" % "template-resolver" % "0.1"
 
-  val scalaXml = "org.scala-lang.modules" %% "scala-xml" % "1.3.0"
-  val scalaParsers = "org.scala-lang.modules" %% "scala-parser-combinators" % "1.1.2"
-  val scalaReflect = Def.setting("org.scala-lang" % "scala-reflect" % scalaVersion.value)
+  val scalaXml = Def.setting(
+    if (scalaBinaryVersion.value == "3") {
+      "org.scala-lang.modules" %% "scala-xml" % "2.0.1"
+    } else {
+      "org.scala-lang.modules" %% "scala-xml" % "1.3.0"
+    }
+  )
+  val scalaParsers = Def.setting(
+    if (scalaBinaryVersion.value == "3") {
+      "org.scala-lang.modules" %% "scala-parser-combinators" % "2.1.0"
+    } else {
+      "org.scala-lang.modules" %% "scala-parser-combinators" % "1.1.2"
+    }
+  )
+  val scalaReflect = Def.setting(
+    if (scalaBinaryVersion.value == "3") {
+      "org.scala-lang" % "scala-reflect" % scala213
+    } else {
+      "org.scala-lang" % "scala-reflect" % scalaVersion.value
+    }
+  )
   val scalaPar = "org.scala-lang.modules" %% "scala-parallel-collections" % "1.0.0"
 
   // specify all of log4j modules to prevent misalignment
diff --git a/project/HouseRulesPlugin.scala b/project/HouseRulesPlugin.scala
index 4a0b9fa1e..f1532dd8c 100644
--- a/project/HouseRulesPlugin.scala
+++ b/project/HouseRulesPlugin.scala
@@ -23,6 +23,7 @@ object HouseRulesPlugin extends AutoPlugin {
       })
       .value
       .toList,
+    scalacOptions ++= "-Ykind-projector".ifScala3.value.toList,
     scalacOptions ++= "-Yinline-warnings".ifScala211OrMinus.value.toList,
     scalacOptions ++= "-Yno-adapted-args".ifScala212OrMinus.value.toList,
     scalacOptions += "-Ywarn-dead-code",
@@ -44,5 +45,9 @@ object HouseRulesPlugin extends AutoPlugin {
     def ifScala211OrPlus = ifScalaGte(11)
     def ifScala212OrMinus = ifScalaLte(12)
     def ifScala213OrMinus = ifScalaLte(13)
+    def ifScala3 = Def.setting(
+      if (scalaBinaryVersion.value == "3") Seq(__x)
+      else Nil
+    )
   }
 }