Merge pull request #431 from polyvariant/scala3

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13.6]
+        scala: [3.1.1]
         java: [graalvm-ce-java11@20.1.0]
     runs-on: ${{ matrix.os }}
     steps:
@@ -78,7 +78,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13.6]
+        scala: [3.1.1]
         java: [graalvm-ce-java11@20.1.0]
     runs-on: ${{ matrix.os }}
     steps:
@@ -104,12 +104,12 @@ jobs:
             ~/Library/Caches/Coursier/v1
           key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
 
-      - name: Download target directories (2.13.6)
+      - name: Download target directories (3.1.1)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-2.13.6-${{ matrix.java }}
+          name: target-${{ matrix.os }}-3.1.1-${{ matrix.java }}
 
-      - name: Inflate target directories (2.13.6)
+      - name: Inflate target directories (3.1.1)
         run: |
           tar xf targets.tar
           rm targets.tar

.scalafmt.conf

@@ -1,4 +1,4 @@
-runner.dialect=scala213
+runner.dialect=scala3
 
 version = "3.5.3"
 maxColumn = 140

build.sbt

@@ -2,6 +2,8 @@ import com.typesafe.sbt.packager.docker.Cmd
 
 import com.typesafe.sbt.packager.docker.ExecCmd
 
+Global / onChangedBuildSource := ReloadOnSourceChanges
+
 inThisBuild(
   List(
     organization := "io.pg",
@@ -22,9 +24,9 @@ inThisBuild(
 
 val GraalVM11 = "graalvm-ce-java11@20.1.0"
 
-val Scala213 = "2.13.6"
-ThisBuild / scalaVersion := Scala213
-ThisBuild / crossScalaVersions := Seq(Scala213)
+val Scala3 = "3.1.1"
+ThisBuild / scalaVersion := Scala3
+ThisBuild / crossScalaVersions := Seq(Scala3)
 ThisBuild / githubWorkflowJavaVersions := Seq(GraalVM11)
 
 ThisBuild / githubWorkflowPublishTargetBranches := Seq(
@@ -67,23 +69,18 @@ def crossPlugin(x: sbt.librarymanagement.ModuleID) =
   compilerPlugin(x.cross(CrossVersion.full))
 
 val compilerPlugins = List(
-  crossPlugin("org.typelevel" % "kind-projector" % "0.13.2"),
-  crossPlugin("com.github.cb372" % "scala-typed-holes" % "0.1.11"),
-  crossPlugin("org.polyvariant" % "better-tostring" % "0.3.15"),
-  compilerPlugin("com.olegpy" %% "better-monadic-for" % "0.3.1")
+  crossPlugin("org.polyvariant" % "better-tostring" % "0.3.15")
 )
 
 val commonSettings = List(
   scalacOptions --= List("-Xfatal-warnings"),
-  scalacOptions += "-Ymacro-annotations",
   libraryDependencies ++= List(
     "org.typelevel" %% "cats-core" % "2.7.0",
     "org.typelevel" %% "cats-effect" % "3.3.12",
-    "org.typelevel" %% "cats-tagless-macros" % "0.14.0",
     "co.fs2" %% "fs2-core" % "3.2.7",
     "com.github.valskalla" %% "odin-core" % "0.13.0",
-    "io.circe" %% "circe-core" % "0.14.1",
-    "dev.optics" %% "monocle-macro" % "3.1.0",
+    "io.circe" %% "circe-core" % "0.14.2",
+    "dev.optics" %% "monocle-core" % "3.1.0",
     "com.disneystreaming" %% "weaver-cats" % "0.7.11" % Test,
     "com.disneystreaming" %% "weaver-scalacheck" % "0.7.11" % Test
   ) ++ compilerPlugins,
@@ -97,9 +94,8 @@ lazy val gitlab = project
     libraryDependencies ++= List(
       "is.cir" %% "ciris" % "2.3.2",
       "com.kubukoz" %% "caliban-gitlab" % "0.1.0",
-      "io.circe" %% "circe-generic-extras" % "0.14.1",
-      "io.circe" %% "circe-parser" % "0.14.1" % Test,
-      "io.circe" %% "circe-literal" % "0.14.1" % Test,
+      "io.circe" %% "circe-parser" % "0.14.2" % Test,
+      "io.circe" %% "circe-literal" % "0.14.2" % Test,
       "com.softwaremill.sttp.tapir" %% "tapir-core" % "0.18.0-M17",
       "com.softwaremill.sttp.tapir" %% "tapir-json-circe" % "0.18.0-M17",
       "com.softwaremill.sttp.tapir" %% "tapir-sttp-client" % "0.18.0-M17"
@@ -109,18 +105,17 @@ lazy val gitlab = project
 
 lazy val bootstrap = project
   .settings(
-    scalaVersion := "3.0.0",
+    scalaVersion := Scala3,
     libraryDependencies ++= List(
       "org.typelevel" %% "cats-core" % "2.7.0",
       "org.typelevel" %% "cats-effect" % "3.3.12",
       "com.kubukoz" %% "caliban-gitlab" % "0.1.0",
       "com.softwaremill.sttp.client3" %% "core" % "3.3.15",
       "com.softwaremill.sttp.client3" %% "circe" % "3.3.15",
-      "io.circe" %% "circe-core" % "0.14.1",
+      "io.circe" %% "circe-core" % "0.14.2",
       crossPlugin("org.polyvariant" % "better-tostring" % "0.3.15")
     ),
     publish / skip := true,
-    // Compile / mainClass := Some("org.polyvariant.Main"),
     githubWorkflowArtifactUpload := false,
     nativeImageVersion := "22.1.0",
     nativeImageOptions ++= Seq(
@@ -195,12 +190,11 @@ lazy val pitgull =
         "org.http4s" %% "http4s-blaze-server" % "0.23.11",
         "org.http4s" %% "http4s-blaze-client" % "0.23.11",
         "is.cir" %% "ciris" % "2.3.2",
-        "io.circe" %% "circe-generic-extras" % "0.14.0",
-        "io.scalaland" %% "chimney" % "0.6.1",
         "io.chrisdavenport" %% "cats-time" % "0.4.0",
         "com.github.valskalla" %% "odin-core" % "0.13.0",
         "com.github.valskalla" %% "odin-slf4j" % "0.13.0",
-        "io.github.vigoo" %% "prox-fs2-3" % "0.7.7"
+        "io.github.vigoo" %% "prox-fs2-3" % "0.7.7",
+        "io.circe" %% "circe-literal" % "0.14.2" % Test
       )
     )
     .dependsOn(core, gitlab)

core/src/main/scala/io/pg/messaging/messaging.scala

@@ -2,11 +2,12 @@ package io.pg.messaging
 
 import cats.effect.std.Queue
 import scala.reflect.ClassTag
-import cats.tagless.autoInvariant
 import cats.syntax.all._
 import cats.ApplicativeError
 import io.odin.Logger
 import cats.Functor
+import cats.Invariant
+import cats.ApplicativeThrow
 
 trait Publisher[F[_], -A] {
   def publish(a: A): F[Unit]
@@ -16,7 +17,7 @@ final case class Processor[F[_], -A](process: fs2.Pipe[F, A, Unit])
 
 object Processor {
 
-  def simple[F[_]: ApplicativeError[*[_], Throwable]: Logger, A](
+  def simple[F[_]: ApplicativeThrow: Logger, A](
     f: A => F[Unit]
   ): Processor[F, A] =
     Processor[F, A] {
@@ -35,13 +36,21 @@ object Processor {
 
 }
 
-@autoInvariant
-trait Channel[F[_], A] extends Publisher[F, A] { self =>
+trait Channel[F[_], A] extends Publisher[F, A] {
   def consume: fs2.Stream[F, A]
 }
 
 object Channel {
 
+  given [F[_]]: Invariant[Channel[F, *]] with {
+
+    def imap[A, B](chan: Channel[F, A])(f: A => B)(g: B => A): Channel[F, B] = new {
+      def consume: fs2.Stream[F, B] = chan.consume.map(f)
+      def publish(b: B): F[Unit] = chan.publish(g(b))
+    }
+
+  }
+
   def fromQueue[F[_]: Functor, A](q: Queue[F, A]): Channel[F, A] =
     new Channel[F, A] {
       def publish(a: A): F[Unit] = q.offer(a)

gitlab/src/main/scala/io/pg/gitlab/Gitlab.scala

@@ -8,7 +8,6 @@ import caliban.client.SelectionBuilder
 import cats.MonadError
 import cats.kernel.Eq
 import cats.syntax.all._
-import cats.tagless.finalAlg
 import ciris.Secret
 import io.odin.Logger
 import io.pg.gitlab.Gitlab.MergeRequestInfo
@@ -30,14 +29,12 @@ import sttp.tapir.generic.auto._
 import sttp.tapir.json.circe._
 import fs2.Stream
 import io.circe.{Codec => CirceCodec}
-import io.circe.generic.extras.semiauto._
-import io.circe.generic.extras.Configuration
 import io.pg.gitlab.GitlabEndpoints.transport.MergeRequestApprovals
-import monocle.macros.Lenses
+import monocle.syntax.all._
 import cats.Show
 import io.pg.TextUtils
+import cats.MonadThrow
 
-@finalAlg
 trait Gitlab[F[_]] {
   def mergeRequests(projectId: Long): F[List[MergeRequestInfo]]
   def acceptMergeRequest(projectId: Long, mergeRequestIid: Long): F[Unit]
@@ -47,10 +44,11 @@ trait Gitlab[F[_]] {
 
 object Gitlab {
 
+  def apply[F[_]](using F: Gitlab[F]): Gitlab[F] = F
+
   // VCS-specific MR information
   // Not specific to the method of fetching (no graphql model references etc.)
   // Fields only required according to reason (e.g. must have a numeric ID - we might loosen this later)
-  @Lenses
   final case class MergeRequestInfo(
     projectId: Long,
     mergeRequestIid: Long,
@@ -62,20 +60,19 @@ object Gitlab {
   )
 
   object MergeRequestInfo {
-    sealed trait Status extends Product with Serializable
 
-    object Status {
-      case object Success extends Status
-      final case class Other(value: String) extends Status
+    enum Status {
+      case Success
+      case Other(value: String)
 
       implicit val eq: Eq[Status] = Eq.fromUniversalEquals
     }
 
     implicit val showTrimmed: Show[MergeRequestInfo] =
-      MergeRequestInfo.description.modify(_.map(TextUtils.inline).map(TextUtils.trim(maxChars = 30))).apply(_).toString
+      _.focus(_.description).modify(_.map(TextUtils.inline).map(TextUtils.trim(maxChars = 30))).toString
   }
 
-  def sttpInstance[F[_]: Logger: MonadError[*[_], Throwable]](
+  def sttpInstance[F[_]: Logger: MonadThrow](
     baseUri: Uri,
     accessToken: Secret[String]
   )(
@@ -278,20 +275,21 @@ object GitlabEndpoints {
       .in(query[Int]("approvals_required"))
 
   object transport {
-    implicit val config: Configuration = Configuration.default.withSnakeCaseMemberNames
 
     final case class ApprovalRule(id: Long, name: String, ruleType: String) {
       val isMutable: Boolean = ruleType != "code_owner"
     }
 
     object ApprovalRule {
-      implicit val codec: CirceCodec[ApprovalRule] = deriveConfiguredCodec
+      // todo: use configured codec when https://github.com/circe/circe/pull/1800 is available
+      given CirceCodec[ApprovalRule] = CirceCodec.forProduct3("id", "name", "rule_type")(apply)(r => (r.id, r.name, r.ruleType))
     }
 
     final case class MergeRequestApprovals(approvalsRequired: Int)
 
     object MergeRequestApprovals {
-      implicit val codec: CirceCodec[MergeRequestApprovals] = deriveConfiguredCodec
+      // todo: use configured codec when https://github.com/circe/circe/pull/1800 is available
+      given CirceCodec[MergeRequestApprovals] = CirceCodec.forProduct1("approvals_required")(apply)(_.approvalsRequired)
     }
 
   }

gitlab/src/main/scala/io/pg/gitlab/webhook/webhook.scala

@@ -1,27 +1,17 @@
 package io.pg.gitlab.webhook
 
-import io.circe.generic.extras._
+import io.circe.Codec
 
-private object CirceConfiguration {
-
-  implicit val config: Configuration =
-    Configuration
-      .default
-      .withSnakeCaseMemberNames
-      .withSnakeCaseConstructorNames
-      .withDiscriminator("object_kind")
+final case class WebhookEvent(project: Project, objectKind: String /* for logs */ )
 
+object WebhookEvent {
+  // todo: use configured codec when https://github.com/circe/circe/pull/1800 is available
+  given Codec[WebhookEvent] = Codec.forProduct2("project", "object_kind")(apply)(we => (we.project, we.objectKind))
 }
 
-import CirceConfiguration._
-
-@ConfiguredJsonCodec
-final case class WebhookEvent(project: Project, objectKind: String /* for logs */ )
-
-@ConfiguredJsonCodec
 final case class Project(
   id: Long
-)
+) derives Codec.AsObject
 
 object Project {
   val demo = Project(20190338)

src/main/scala/io/pg/Application.scala

@@ -36,15 +36,15 @@ object Application {
   def resource[F[_]: Logger: Async](
     config: AppConfig
   ): Resource[F, Application[F]] = {
-    implicit val projectConfigReader = ProjectConfigReader.test[F]
+    given ProjectConfigReader[F] = ProjectConfigReader.test[F]
 
     Queue
       .bounded[F, Event](config.queues.maxSize)
       .map(Channel.fromQueue(_))
       .toResource
       .flatMap { eventChannel =>
         implicit val webhookChannel: Channel[F, WebhookEvent] =
-          eventChannel.only[Event.Webhook].imap(_.value)(Event.Webhook)
+          eventChannel.only[Event.Webhook].imap(_.value)(Event.Webhook.apply)
 
         BlazeClientBuilder[F]
           .resource

src/main/scala/io/pg/Main.scala

@@ -78,12 +78,12 @@ object Main extends IOApp {
 
   def serve[F[_]: Async](fToIO: F ~> IO)(config: AppConfig) =
     for {
-      implicit0(logger: Logger[F]) <- mkLogger[F](fToIO)
-      _                            <- logStarting(config.meta).toResource
-      resources                    <- Application.resource[F](config)
-      _                            <- mkServer[F](config, resources.routes)
-      _                            <- resources.background.parTraverse_(_.run).background
-      _                            <- logStarted(config.meta).toResource
+      given Logger[F] <- mkLogger[F](fToIO)
+      _               <- logStarting(config.meta).toResource
+      resources       <- Application.resource[F](config)
+      _               <- mkServer[F](config, resources.routes)
+      _               <- resources.background.parTraverse_(_.run).background
+      _               <- logStarted(config.meta).toResource
     } yield ()
 
   def run(args: List[String]): IO[ExitCode] =

src/main/scala/io/pg/MergeRequests.scala

@@ -6,7 +6,6 @@ import cats.Show
 import cats.data.EitherNel
 import cats.data.NonEmptyList
 import cats.implicits._
-import cats.tagless.finalAlg
 import fs2.Pipe
 import io.odin.Logger
 import io.pg.MergeRequestState
@@ -16,12 +15,13 @@ import io.pg.StateResolver
 import io.pg.config.ProjectConfigReader
 import io.pg.gitlab.webhook.Project
 
-@finalAlg
 trait MergeRequests[F[_]] {
   def build(project: Project): F[List[MergeRequestState]]
 }
 
 object MergeRequests {
+  def apply[F[_]](using F: MergeRequests[F]): MergeRequests[F] = F
+
   import scala.util.chaining._
 
   def instance[F[_]: ProjectConfigReader: StateResolver: Monad: Logger](

src/main/scala/io/pg/actions.scala

@@ -176,7 +176,7 @@ object ProjectActions {
     matchers
       .traverse(_.matches(input).swap)
       .swap
-      .leftMap(Mismatch.ManyFailed)
+      .leftMap(Mismatch.ManyFailed.apply)
       .toEitherNel
 
   def not[A](matcher: MatcherFunction[A]): MatcherFunction[A] = input =>
@@ -211,9 +211,7 @@ object ProjectActions {
 
 }
 
-sealed trait ProjectAction extends Product with Serializable
-
-object ProjectAction {
-  final case class Merge(projectId: Long, mergeRequestIid: Long) extends ProjectAction
-  final case class Rebase(projectId: Long, mergeRequestIid: Long) extends ProjectAction
+enum ProjectAction {
+  case Merge(projectId: Long, mergeRequestIid: Long)
+  case Rebase(projectId: Long, mergeRequestIid: Long)
 }