Scala 3

Author: xuwei-k

.github/workflows/ci.yml

@@ -8,6 +8,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-22.04", "windows-2022", "macos-12"]
+        scala: ["2.12", "2.13", "3"]
 
     steps:
     - uses: actions/checkout@v4
@@ -25,7 +26,7 @@ jobs:
         key: ${{ runner.os }}-sbt-${{ hashFiles('**/*.sbt') }}
     - name: Compile and test
       run: |
-       sbt test
+       sbt "++ ${{ matrix.scala }}.x" test
       shell: bash
     - name: Format check
       if: ${{ runner.os == 'Linux' }}

bridge/src/test/scala/protocbridge/frontend/PluginFrontendSpec.scala

@@ -28,7 +28,7 @@ class PluginFrontendSpec
     actual("a" * 256) must be(expected("a" * 256))
     actual("\u3714\u3715" * 256) must be(expected("\u3714\u3715" * 256))
     actual("abc" * 1000) must be(expected("abc" * 1000))
-    forAll(MinSuccessful(1000)) { s: String =>
+    forAll(MinSuccessful(1000)) { (s: String) =>
       actual(s) must be(expected(s))
     }
 

build.sbt

@@ -3,7 +3,7 @@ import com.typesafe.tools.mima.core._
 inThisBuild(
   List(
     scalaVersion := "2.12.20",
-    crossScalaVersions := Seq("2.12.20", "2.13.15"),
+    crossScalaVersions := Seq("2.12.20", "2.13.15", "3.3.4"),
     scalacOptions ++= List("-release", "8"),
     javacOptions ++= List("-target", "8", "-source", "8"),
     organization := "com.thesamet.scalapb"
@@ -28,9 +28,31 @@ lazy val bridge: Project = project
       "org.scalatestplus" %% "scalacheck-1-16" % "3.2.14.0" % "test",
       "org.scalatest" %% "scalatest" % "3.2.19" % "test",
       "org.scalacheck" %% "scalacheck" % "1.18.1" % "test",
-      "org.scala-lang.modules" %% "scala-collection-compat" % "2.12.0" % "test",
-      "io.get-coursier" %% "coursier" % coursierVersion % "test"
+      "io.get-coursier" %% "coursier" % coursierVersion % "test" cross CrossVersion.for3Use2_13
     ),
+    conflictWarning := {
+      if (scalaBinaryVersion.value == "3") {
+        ConflictWarning("warn", Level.Warn, false)
+      } else {
+        conflictWarning.value
+      }
+    },
+    Test / testOptions ++= {
+      scalaBinaryVersion.value match {
+        case "2.12" =>
+          Nil
+        case _ =>
+          // TODO
+          Seq(
+            Tests.Exclude(
+              Set(
+                "protocbridge.codegen.CodeGenAppSpec",
+                "protocbridge.ProtocCacheSpec"
+              )
+            )
+          )
+      }
+    },
     scalacOptions ++= (if (scalaVersion.value.startsWith("2.13."))
                          Seq("-Wconf:origin=.*JavaConverters.*:s")
                        else Nil),
@@ -51,8 +73,15 @@ lazy val protocCacheCoursier = project
   .dependsOn(bridge)
   .settings(
     name := "protoc-cache-coursier",
+    conflictWarning := {
+      if (scalaBinaryVersion.value == "3") {
+        ConflictWarning("warn", Level.Warn, false)
+      } else {
+        conflictWarning.value
+      }
+    },
     libraryDependencies ++= Seq(
-      "io.get-coursier" %% "coursier" % coursierVersion
+      "io.get-coursier" %% "coursier" % coursierVersion cross CrossVersion.for3Use2_13
     )
   )
 
@@ -61,6 +90,13 @@ lazy val protocGen = project
   .dependsOn(bridge % "compile->compile;test->test")
   .settings(
     name := "protoc-gen",
+    conflictWarning := {
+      if (scalaBinaryVersion.value == "3") {
+        ConflictWarning("warn", Level.Warn, false)
+      } else {
+        conflictWarning.value
+      }
+    },
     libraryDependencies ++= Seq(
       protobufJava % "provided"
     ),

protoc-cache-coursier/src/main/scala/protocbridge/ProtocCacheCoursier.scala

@@ -47,8 +47,16 @@ object CoursierProtocCache {
   }
 
   private[this] def protocDep(version: String): Dependency =
-    dep"com.google.protobuf:protoc"
-      .withVersion(version)
+    coursier.core
+      .Dependency(
+        coursier.core
+          .Module(
+            coursier.core.Organization("com.google.protobuf"),
+            coursier.core.ModuleName("protoc"),
+            Map.empty
+          ),
+        version
+      )
       .withPublication(
         "protoc",
         Type("jar"),