for Scala 3 users, require Scala 3.1+

as per scala/scala-lang#1387, there's no longer any need
to keep supporting Scala 3.0.x. it's fine to expect people
to upgrade to 3.1 or higher

Author: SethTisue

.github/workflows/ci.yml

@@ -11,45 +11,43 @@ jobs:
       fail-fast: false
       matrix:
         java: [8, 11, 17]
-        scala: [2.11.x, 2.12.x, 2.13.x, 3.0.x]
-        platform: [jvm, js, native]
+        scala: [2.11.x, 2.12.x, 2.13.x, 3.x]
+        platform: [JVM, JS, Native]
         mode: [normal]
         exclude:
-          - scala: 3.0.x
-            platform: native
           - java: 11
-            platform: js
+            platform: JS
           - java: 11
-            platform: native
+            platform: Native
           - java: 17
-            platform: js
+            platform: JS
           - java: 17
-            platform: native
+            platform: Native
         include:
           - java: 8
             scala: 2.12.x
             mode: testScalafix
-            platform: jvm
+            platform: JVM
           - java: 8
             scala: 2.12.x
             mode: testBinaryCompat
-            platform: jvm
+            platform: JVM
           - java: 8
             scala: 2.12.x
             mode: testScalafmt
-            platform: jvm
+            platform: JVM
           - java: 8
             scala: 2.12.x
             mode: headerCheck
-            platform: jvm
+            platform: JVM
           - java: 11
             scala: 2.12.x
             mode: normal
-            platform: jvm
+            platform: JVM
           - java: 17
             scala: 2.12.x
             mode: normal
-            platform: jvm
+            platform: JVM
     runs-on: ubuntu-latest
     env:
       CI_JDK: ${{matrix.java}}

build.sbt

@@ -30,9 +30,9 @@ lazy val root = project
     compat213JVM,
     compat213JS,
     compat213Native,
-    compat30JVM,
-    compat30JS,
-    compat31Native,
+    compat3JVM,
+    compat3JS,
+    compat3Native,
     scalafixData211,
     scalafixData212,
     scalafixData213,
@@ -53,8 +53,7 @@ lazy val junit = libraryDependencies += "com.github.sbt" % "junit-interface" % "
 lazy val scala211 = "2.11.12"
 lazy val scala212 = "2.12.15"
 lazy val scala213 = "2.13.8"
-lazy val scala30  = "3.0.2"
-lazy val scala31  = "3.1.3"
+lazy val scala3   = "3.1.3"
 
 lazy val compat = new MultiScalaCrossProject(
   "compat",
@@ -158,8 +157,7 @@ lazy val compat = new MultiScalaCrossProject(
 val compat211 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala211)
 val compat212 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala212)
 val compat213 = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala213)
-val compat30  = compat(Seq(JSPlatform, JVMPlatform), scala30)
-val compat31  = compat(Seq(JVMPlatform, NativePlatform), scala31)
+val compat3   = compat(Seq(JSPlatform, JVMPlatform, NativePlatform), scala3)
 
 lazy val compat211JVM    = compat211.jvm
 lazy val compat211JS     = compat211.js
@@ -170,9 +168,9 @@ lazy val compat212Native = compat212.native
 lazy val compat213JVM    = compat213.jvm
 lazy val compat213JS     = compat213.js
 lazy val compat213Native = compat213.native
-lazy val compat30JVM     = compat30.jvm
-lazy val compat30JS      = compat30.js
-lazy val compat31Native  = compat31.native
+lazy val compat3JVM      = compat3.jvm
+lazy val compat3JS       = compat3.js
+lazy val compat3Native   = compat3.native
 
 lazy val binaryCompatOld = project
   .in(file("binary-compat/old"))
@@ -335,8 +333,7 @@ lazy val scalafixTests = project
   .enablePlugins(BuildInfoPlugin, ScalafixTestkitPlugin)
 
 val ciScalaVersion = sys.env.get("CI_SCALA_VERSION").flatMap(Version.parse)
-val isScalaJs      = sys.env.get("CI_PLATFORM") == Some("js")
-val isScalaNative  = sys.env.get("CI_PLATFORM") == Some("native")
+val ciPlatform     = sys.env.get("CI_PLATFORM").map(p => if (p == "JVM") "" else p)
 val isScalafix     = sys.env.get("CI_MODE") == Some("testScalafix")
 val isScalafmt     = sys.env.get("CI_MODE") == Some("testScalafmt")
 val isBinaryCompat = sys.env.get("CI_MODE") == Some("testBinaryCompat")
@@ -370,9 +367,7 @@ inThisBuild {
           ).foreach(k =>
             println(k.padTo(20, " ").mkString("") + " -> " + sys.env.getOrElse(k, "None")))
 
-          val platformSuffix = if (isScalaJs) "JS" else if (isScalaNative) "Native" else ""
-
-          val compatProject       = s"compat${ciScalaVersion.get}$platformSuffix"
+          val compatProject       = s"compat${ciScalaVersion.get}${ciPlatform.get}"
           val binaryCompatProject = "binaryCompat"
 
           val testProjectPrefix =

project/MultiScalaProject.scala

@@ -30,7 +30,10 @@ import java.io.File
 trait MultiScala {
   def majorMinor(in: String): String = {
     val Array(major, minor, _) = in.split("\\.")
-    major + minor
+    if (major == "2")
+      s"$major$minor"
+    else
+      major
   }
 
   def projectIdPerScala(name: String, scalaV: String): String = s"$name${majorMinor(scalaV)}"

project/Version.scala

@@ -1,24 +1,19 @@
-case class Version(major: Int, minor: Int) {
-  override def toString = s"${major}${minor}"
-}
-
 object Version {
   // `(#.+)?` allows republishing for a new Scala version
   // `|x` allows the sbt 1.7 style ".x" versions
   private val versionRegex0 = "v?([0-9]+)\\.([0-9]+)\\.([0-9]+|x)(?:#.+)?".r
   private val versionRegex1 = "v?([0-9]+)\\.([0-9]+)\\.([0-9]+|x)-(.+)(?:#.+)?".r
-  private val versionRegex2 = "([0-9]+)\\.([0-9]+)(?:#.+)?".r
-  private val versionRegex3 = "([0-9]+)(?:#.+)?".r
-  def parse(raw: String): Option[Version] = {
+  private val versionRegex2 = "([0-9]+)\\.([0-9]+|x)(?:#.+)?".r
+  def parse(raw: String): Option[String] = {
     raw match {
       case versionRegex0(major, minor, _) =>
-        Some(Version(major.toInt, minor.toInt))
+        Some(s"${major.toInt}${minor.toInt}")
       case versionRegex1(major, minor, _, _) =>
-        Some(Version(major.toInt, minor.toInt))
+        Some(s"${major.toInt}${minor.toInt}")
+      case versionRegex2(major, "x") =>
+        Some(s"${major.toInt}")
       case versionRegex2(major, minor) =>
-        Some(Version(major.toInt, minor.toInt))
-      case versionRegex3(major) =>
-        Some(Version(major.toInt, 0))
+        Some(s"${major.toInt}${minor.toInt}")
       case _ =>
         None
     }