From f08f2098d376055565f88121d2be8f426daf3b39 Mon Sep 17 00:00:00 2001
From: Dale Wijnand <dale.wijnand@gmail.com>
Date: Fri, 20 Mar 2020 20:54:13 +0000
Subject: [PATCH] Fast-fail on unsupported Scala versions

---
 .../main/scala/com/typesafe/tools/mima/lib/MiMaLib.scala | 9 ++++++++-
 .../typesafe/tools/mima/lib/CollectProblemsTest.scala    | 2 +-
 .../com/typesafe/tools/mima/plugin/MimaPlugin.scala      | 3 ++-
 .../scala/com/typesafe/tools/mima/plugin/SbtMima.scala   | 4 ++--
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/core/src/main/scala/com/typesafe/tools/mima/lib/MiMaLib.scala b/core/src/main/scala/com/typesafe/tools/mima/lib/MiMaLib.scala
index 94aca688..5bd5d923 100644
--- a/core/src/main/scala/com/typesafe/tools/mima/lib/MiMaLib.scala
+++ b/core/src/main/scala/com/typesafe/tools/mima/lib/MiMaLib.scala
@@ -11,7 +11,14 @@ import scala.tools.nsc.classpath.AggregateClassPath
 import scala.tools.nsc.mima.ClassPathAccessors
 import scala.tools.nsc.util.ClassPath
 
-final class MiMaLib(cp: Seq[File], log: Logging = ConsoleLogging) {
+final class MiMaLib(cp: Seq[File], scalaVersion: String, log: Logging = ConsoleLogging) {
+  locally {
+    scalaVersion.take(5) match {
+      case "2.11." | "2.12." | "2.13." => () // ok
+      case _ => throw new IllegalArgumentException(s"MiMa supports Scala 2.10-2.13, not $scalaVersion")
+    }
+  }
+
   val classpath =
     AggregateClassPath.createAggregate(cp.flatMap(pathToClassPath(_)) :+ Config.baseClassPath: _*)
 
diff --git a/functional-tests/src/main/scala/com/typesafe/tools/mima/lib/CollectProblemsTest.scala b/functional-tests/src/main/scala/com/typesafe/tools/mima/lib/CollectProblemsTest.scala
index 9065a4b4..9536b77c 100644
--- a/functional-tests/src/main/scala/com/typesafe/tools/mima/lib/CollectProblemsTest.scala
+++ b/functional-tests/src/main/scala/com/typesafe/tools/mima/lib/CollectProblemsTest.scala
@@ -11,7 +11,7 @@ object CollectProblemsTest {
 
   // Called via reflection from TestsPlugin
   def runTest(cp: Array[File], testName: String, oldJarOrDir: File, newJarOrDir: File, baseDir: File, oracleFile: File): Unit = {
-    val mima = new MiMaLib(cp)
+    val mima = new MiMaLib(cp, scala.util.Properties.versionNumberString)
 
     val configFile = new File(baseDir, "test.conf")
     val configFallback = ConfigFactory.parseString("filter { problems = [] }")
diff --git a/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/MimaPlugin.scala b/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/MimaPlugin.scala
index 19e099bf..1643d2ba 100644
--- a/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/MimaPlugin.scala
+++ b/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/MimaPlugin.scala
@@ -77,6 +77,7 @@ object MimaPlugin extends AutoPlugin {
     val previousClassfiles = mimaPreviousClassfiles.value
     val currentClassfiles = mimaCurrentClassfiles.value
     val cp = (fullClasspath in mimaFindBinaryIssues).value
+    val sv = scalaVersion.value
     val log = new SbtLogger(s)
 
     if (previousClassfiles eq NoPreviousClassfiles) {
@@ -87,7 +88,7 @@ object MimaPlugin extends AutoPlugin {
     }
 
     previousClassfiles.iterator.map { case (moduleId, prevClassfiles) =>
-      moduleId -> SbtMima.runMima(prevClassfiles, currentClassfiles, cp, mimaCheckDirection.value, log)
+      moduleId -> SbtMima.runMima(prevClassfiles, currentClassfiles, cp, mimaCheckDirection.value, sv, log)
     }
   }
 
diff --git a/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/SbtMima.scala b/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/SbtMima.scala
index b7018b2f..c5590642 100644
--- a/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/SbtMima.scala
+++ b/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/SbtMima.scala
@@ -21,8 +21,8 @@ import scala.util.matching._
 object SbtMima {
   /** Runs MiMa and returns a two lists of potential binary incompatibilities,
       the first for backward compatibility checking, and the second for forward checking. */
-  def runMima(prev: File, curr: File, cp: Classpath, dir: String, log: Logging): (List[Problem], List[Problem]) = {
-    val mimaLib = new MiMaLib(Attributed.data(cp), log)
+  def runMima(prev: File, curr: File, cp: Classpath, dir: String, scalaVersion: String, log: Logging): (List[Problem], List[Problem]) = {
+    val mimaLib = new MiMaLib(Attributed.data(cp), scalaVersion, log)
     def checkBC = mimaLib.collectProblems(prev, curr)
     def checkFC = mimaLib.collectProblems(curr, prev)
     dir match {