Support several scalafixScalaBinaryVersion within a build

src/main/scala/scalafix/sbt/ScalafixPlugin.scala

@@ -158,6 +158,11 @@ object ScalafixPlugin extends AutoPlugin {
         SettingKey[Boolean]("bspEnabled") := false
       )
     ),
+    scalafixInterfaceProvider := ScalafixInterface.fromToolClasspath(
+      (scalafixScalaBinaryVersion).value,
+      scalafixDependencies = (scalafixDependencies).value,
+      scalafixCustomResolvers = (scalafixResolvers).value
+    ),
     update := {
       object SemanticdbScalac {
         def unapply(id: ModuleID): Option[String] =
@@ -211,11 +216,6 @@ object ScalafixPlugin extends AutoPlugin {
         ),
     scalafixDependencies := Nil,
     commands += ScalafixEnable.command,
-    scalafixInterfaceProvider := ScalafixInterface.fromToolClasspath(
-      (ThisBuild / scalafixScalaBinaryVersion).value,
-      scalafixDependencies = (ThisBuild / scalafixDependencies).value,
-      scalafixCustomResolvers = (ThisBuild / scalafixResolvers).value
-    ),
     scalafixInterfaceCache := new BlockingCache[
       ToolClasspath,
       ScalafixInterface

src/sbt-test/sbt-scalafix/cross-build-advanced/.scalafix-2.conf

@@ -0,0 +1,3 @@
+rules = [DisableSyntax, OrganizeImports, ExplicitResultTypes]
+OrganizeImports.removeUnused = true
+ExplicitResultTypes.skipSimpleDefinitions = false

src/sbt-test/sbt-scalafix/cross-build-advanced/.scalafix-3.conf

@@ -0,0 +1,2 @@
+rules = [DisableSyntax, OrganizeImports]
+OrganizeImports.removeUnused = false

src/sbt-test/sbt-scalafix/cross-build-advanced/build.sbt

@@ -0,0 +1,24 @@
+import _root_.scalafix.sbt.{BuildInfo => Versions}
+
+val scala3Version = "3.3.0"
+ThisBuild / semanticdbEnabled := true
+ThisBuild / semanticdbVersion := scalafixSemanticdb.revision
+
+lazy val root = project
+  .in(file("."))
+  .settings(
+    scalaVersion := Versions.scala212,
+    crossScalaVersions := Seq(Versions.scala212, Versions.scala213, scala3Version),
+    scalacOptions ++= (if (scalaVersion.value.startsWith("2")) Seq("-Ywarn-unused") else Seq()),
+    scalafixScalaBinaryVersion := {
+      if ((scalaBinaryVersion).value == "3") {
+        (scalafixScalaBinaryVersion).value
+      } else { (scalaBinaryVersion).value }
+    },
+    scalafixConfig := {
+      if (scalaBinaryVersion.value == "3")
+         Some(file(".scalafix-3.conf"))
+      else
+         Some(file(".scalafix-2.conf"))
+    }
+  )

src/sbt-test/sbt-scalafix/cross-build-advanced/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.9.7

src/sbt-test/sbt-scalafix/cross-build-advanced/project/plugins.sbt

@@ -0,0 +1,3 @@
+resolvers += Resolver.sonatypeRepo("public")
+libraryDependencies += "com.googlecode.java-diff-utils" % "diffutils" % "1.3.0"
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % sys.props("plugin.version"))

src/sbt-test/sbt-scalafix/cross-build-advanced/src/main/scala-2/Main.scala

@@ -0,0 +1,7 @@
+import scala.Int
+import scala.collection.Seq
+import scala.collection.AbstractSeq
+
+object Main {
+  def foo(a: Int) = a + 2.0f
+}

src/sbt-test/sbt-scalafix/cross-build-advanced/src/main/scala-2/Main.scala.expected

@@ -0,0 +1,5 @@
+import scala.Int
+
+object Main {
+  def foo(a: Int): Float = a + 2.0f
+}

src/sbt-test/sbt-scalafix/cross-build-advanced/src/main/scala-3/Main.scala

@@ -0,0 +1,7 @@
+import scala.Int
+import scala.collection.Seq
+import scala.collection.AbstractSeq
+
+object Main {
+  def foo(a: Int) = a + 2.0f
+}

src/sbt-test/sbt-scalafix/cross-build-advanced/src/main/scala-3/Main.scala.expected

@@ -0,0 +1,7 @@
+import scala.Int
+import scala.collection.AbstractSeq
+import scala.collection.Seq
+
+object Main {
+  def foo(a: Int) = a + 2.0f
+}

src/sbt-test/sbt-scalafix/cross-build-advanced/test

@@ -0,0 +1,6 @@
+> +compile
+
+> +scalafix
+
+$ must-mirror src/main/scala-2/Main.scala src/main/scala-2/Main.scala.expected
+$ must-mirror src/main/scala-3/Main.scala src/main/scala-3/Main.scala.expected