[WIP] Migrate to 2.13

build.sbt

@@ -40,14 +40,16 @@ val scala212CompilerOptions = List(
 logo := Welcome.logo
 usefulTasks := Welcome.tasks
 
+ThisBuild / scalafixScalaBinaryVersion := scalaBinaryVersion.value
+
 inThisBuild(
   List(
     version ~= { dynVer =>
       if (isCI) dynVer
       else localSnapshotVersion // only for local publishing
     },
     // note bucket created by @tgodzik
-    scalaVersion := V.scala212,
+    scalaVersion := V.scala213,
     crossScalaVersions := List(V.scala212),
     scalacOptions ++= List(
       "-target:jvm-1.8",
@@ -219,10 +221,10 @@ lazy val V = new {
   val ammonite213Version = scala213
 
   val ammonite = "2.4.1"
-  val bloop = "1.4.11-30-75fb3441"
+  val bloop = "1.4.11-40-39ec23e0"
   val bloopNightly = bloop
   val bsp = "2.0.0-M15"
-  val coursier = "2.0.16"
+  val coursier = "2.1.0-M2"
   val coursierInterfaces = "1.0.6"
   val debugAdapter = "2.0.12"
   val genyVersion = "0.7.0"
@@ -487,7 +489,7 @@ lazy val metals = project
       // for BSP
       "org.scala-sbt.ipcsocket" % "ipcsocket" % "1.4.0",
       "ch.epfl.scala" % "bsp4j" % V.bsp,
-      "ch.epfl.scala" %% "bloop-launcher" % V.bloopNightly,
+      "ch.epfl.scala" %% "bloop-launcher-core" % V.bloopNightly,
       // for LSP
       V.lsp4j,
       // for DAP
@@ -534,7 +536,8 @@ lazy val metals = project
       "org.scalameta" %% "scalameta" % V.scalameta,
       "org.scalameta" % "semanticdb-scalac-core" % V.scalameta cross CrossVersion.full,
       // For starting Ammonite
-      "io.github.alexarchambault.ammonite" %% "ammonite-runner" % "0.3.2"
+      "io.github.alexarchambault.ammonite" %% "ammonite-runner" % "0.3.2",
+      "org.scala-lang.modules" %% "scala-xml" % "2.0.1"
     ),
     buildInfoPackage := "scala.meta.internal.metals",
     buildInfoKeys := Seq[BuildInfoKey](
@@ -582,6 +585,7 @@ lazy val `sbt-metals` = project
       "semanticdbVersion" -> V.semanticdb,
       "supportedScala2Versions" -> V.scala2Versions
     ),
+    scalaVersion := V.scala212,
     scriptedLaunchOpts ++= Seq(s"-Dplugin.version=${version.value}")
   )
   .enablePlugins(BuildInfoPlugin, SbtPlugin)
@@ -595,12 +599,9 @@ lazy val input = project
     libraryDependencies ++= List(
       // these projects have macro annotations
       "org.scalameta" %% "scalameta" % V.scalameta,
-      "io.circe" %% "circe-derivation-annotations" % "0.9.0-M5"
+      "io.circe" %% "circe-derivation-annotations" % "0.13.0-M5"
     ),
-    scalacOptions += "-P:semanticdb:synthetics:on",
-    addCompilerPlugin(
-      "org.scalamacros" % "paradise" % "2.1.1" cross CrossVersion.full
-    )
+    scalacOptions += "-P:semanticdb:synthetics:on"
   )
   .disablePlugins(ScalafixPlugin)
 
@@ -791,10 +792,6 @@ lazy val bench = project
     run / fork := true,
     publish / skip := true,
     moduleName := "metals-bench",
-    libraryDependencies ++= List(
-      // for measuring memory usage
-      "org.spire-math" %% "clouseau" % "0.2.2"
-    ),
     buildInfoKeys := Seq[BuildInfoKey](scalaVersion),
     buildInfoPackage := "bench",
     Jmh / bspEnabled := false

metals-docs/src/main/scala/docs/Snapshot.scala

@@ -51,19 +51,23 @@ object Snapshot {
     // maven-metadata.xml is consistently outdated so we scrape the "Last modified" column
     // of the HTML page that lists all snapshot releases instead.
     val doc = Jsoup.connect(url).get
-    val snapshots: Seq[Snapshot] = doc.select("tr").asScala.flatMap { tr =>
-      val lastModified =
-        tr.select("td:nth-child(2)").text()
-      val version =
-        tr.select("td:nth-child(1)").text().stripSuffix("/")
-      if (lastModified.nonEmpty && !version.contains("maven-metadata")) {
-        val date: ZonedDateTime =
-          ZonedDateTime.parse(lastModified, zdtFormatter)
-        List(Snapshot(version, date.toLocalDateTime))
-      } else {
-        List()
+    val snapshots: Seq[Snapshot] = doc
+      .select("tr")
+      .asScala
+      .flatMap { tr =>
+        val lastModified =
+          tr.select("td:nth-child(2)").text()
+        val version =
+          tr.select("td:nth-child(1)").text().stripSuffix("/")
+        if (lastModified.nonEmpty && !version.contains("maven-metadata")) {
+          val date: ZonedDateTime =
+            ZonedDateTime.parse(lastModified, zdtFormatter)
+          List(Snapshot(version, date.toLocalDateTime))
+        } else {
+          List()
+        }
       }
-    }
+      .toSeq
     if (snapshots.isEmpty) {
       val doc = Jsoup.connect(url + "maven-metadata.xml").get
       val latest = doc.select("latest").text().trim

metals/src/main/scala/scala/meta/internal/builds/Digest.scala

@@ -4,6 +4,7 @@ import java.nio.charset.StandardCharsets
 import java.nio.file.Files
 import java.security.MessageDigest
 
+import scala.jdk.CollectionConverters._
 import scala.util.control.NonFatal
 import scala.xml.Node
 
@@ -116,9 +117,9 @@ object Digest {
         value <- attr.value
       } digest.update(value.toString().getBytes())
 
-      val chldrenSuccessful: Seq[Boolean] = for {
+      val chldrenSuccessful: Seq[Boolean] = (for {
         child <- node.child
-      } yield digestElement(child)
+      } yield digestElement(child)).toSeq
       chldrenSuccessful.forall(p => p)
     }
     try {

metals/src/main/scala/scala/meta/internal/builds/NewProjectProvider.scala

@@ -4,6 +4,7 @@ import java.io.File
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 import scala.util.Try
 import scala.util.matching.Regex
 

metals/src/main/scala/scala/meta/internal/builds/ShellRunner.scala

@@ -2,6 +2,7 @@ package scala.meta.internal.builds
 
 import scala.concurrent.Future
 import scala.concurrent.Promise
+import scala.jdk.CollectionConverters._
 import scala.util.Properties
 
 import scala.meta.internal.metals.Cancelable

metals/src/main/scala/scala/meta/internal/implementation/ImplementationProvider.scala

@@ -5,6 +5,7 @@ import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.ConcurrentLinkedQueue
 
 import scala.collection.mutable
+import scala.jdk.CollectionConverters._
 import scala.util.control.NonFatal
 
 import scala.meta.internal.metals.Buffers
@@ -287,7 +288,7 @@ final class ImplementationProvider(
         classContext,
         source.toNIO
       )
-      file <- locationsByFile.keySet.toArray.par
+      file <- locationsByFile.keySet.toArray // TODO replcae .par
       locations = locationsByFile(file)
       implPath = AbsolutePath(file)
       implDocument <- findSemanticdb(implPath).toIterable

metals/src/main/scala/scala/meta/internal/implementation/Supermethods.scala

@@ -2,6 +2,7 @@ package scala.meta.internal.implementation
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 
 import scala.meta.internal.implementation.Supermethods.formatMethodSymbolForQuickPick
 import scala.meta.internal.metals.ClientCommands

metals/src/main/scala/scala/meta/internal/metals/ActiveFiles.scala

@@ -2,7 +2,8 @@ package scala.meta.internal.metals
 
 import java.util.concurrent.ConcurrentLinkedQueue
 
-import scala.meta.internal.metals.MetalsEnrichments._
+import scala.jdk.CollectionConverters._
+
 import scala.meta.io.AbsolutePath
 
 /**

metals/src/main/scala/scala/meta/internal/metals/AdjustLspData.scala

@@ -2,6 +2,8 @@ package scala.meta.internal.metals
 
 import java.{util => ju}
 
+import scala.jdk.CollectionConverters._
+
 import scala.meta.internal.metals.MetalsEnrichments._
 import scala.meta.pc.AutoImportsResult
 

metals/src/main/scala/scala/meta/internal/metals/BloopServers.scala

@@ -145,7 +145,7 @@ final class BloopServers(
       override def write(byte: Int): Unit = byte.toChar match {
         case c => b.append(c)
       }
-      def logs = b.lines.toList
+      def logs = b.result.linesIterator
     }
 
     val launcher =

metals/src/main/scala/scala/meta/internal/metals/BuildServerConnection.scala

@@ -13,6 +13,7 @@ import scala.concurrent.ExecutionContext
 import scala.concurrent.ExecutionContextExecutorService
 import scala.concurrent.Future
 import scala.concurrent.Promise
+import scala.jdk.CollectionConverters._
 import scala.reflect.ClassTag
 import scala.util.Try
 

metals/src/main/scala/scala/meta/internal/metals/BuildTargets.scala

@@ -10,6 +10,7 @@ import scala.annotation.tailrec
 import scala.collection.concurrent.TrieMap
 import scala.collection.mutable
 import scala.collection.mutable.ListBuffer
+import scala.jdk.CollectionConverters._
 import scala.util.control.NonFatal
 
 import scala.meta.internal.io.PathIO
@@ -176,7 +177,8 @@ final class BuildTargets(
       scalac <- scalacTargetInfo.get(target.getId)
       scalaTarget <- target.asScalaBuildTarget
     } yield {
-      val autoImports = target.asSbtBuildTarget.map(_.getAutoImports.asScala)
+      val autoImports =
+        target.asSbtBuildTarget.map(_.getAutoImports.asScala.toSeq)
       ScalaTarget(
         target,
         scalaTarget,
@@ -538,7 +540,11 @@ final class BuildTargets(
       query: BuildTargetIdentifier,
       roots: List[BuildTargetIdentifier]
   ): Boolean = {
-    BuildTargets.isInverseDependency(query, roots, inverseDependencies.get)
+    BuildTargets.isInverseDependency(
+      query,
+      roots,
+      inverseDependencies.get(_).map(_.toSeq)
+    )
   }
   def inverseDependencyLeaves(
       target: BuildTargetIdentifier
@@ -553,7 +559,10 @@ final class BuildTargets(
   private def computeInverseDependencies(
       target: BuildTargetIdentifier
   ): BuildTargets.InverseDependencies = {
-    BuildTargets.inverseDependencies(List(target), inverseDependencies.get)
+    BuildTargets.inverseDependencies(
+      List(target),
+      inverseDependencies.get(_).map(_.toSeq)
+    )
   }
 
   def addDependencySource(

metals/src/main/scala/scala/meta/internal/metals/CodeAction.scala

@@ -2,8 +2,8 @@ package scala.meta.internal.metals
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 
-import scala.meta.internal.metals.MetalsEnrichments._
 import scala.meta.pc.CancelToken
 
 import org.eclipse.{lsp4j => l}

metals/src/main/scala/scala/meta/internal/metals/Command.scala

@@ -1,10 +1,10 @@
 package scala.meta.internal.metals
 
+import scala.jdk.CollectionConverters._
 import scala.reflect.ClassTag
 import scala.util.matching.Regex
 
 import scala.meta.internal.metals.JsonParser._
-import scala.meta.internal.metals.MetalsEnrichments._
 
 import org.eclipse.{lsp4j => l}
 

metals/src/main/scala/scala/meta/internal/metals/Compilations.scala

@@ -3,6 +3,7 @@ package scala.meta.internal.metals
 import scala.collection.concurrent.TrieMap
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 import scala.util.Failure
 import scala.util.Success
 import scala.util.Try
@@ -141,6 +142,8 @@ final class Compilations(
 
     val groupedTargetIds = buildTargets.allBuildTargetIds
       .groupBy(buildTargets.buildServerOf(_))
+      .toSeq
+
     Future
       .traverse(groupedTargetIds) { case (connectionOpt, targetIds) =>
         clean(connectionOpt, targetIds)

metals/src/main/scala/scala/meta/internal/metals/Compilers.scala

@@ -8,6 +8,7 @@ import java.{util => ju}
 
 import scala.concurrent.ExecutionContextExecutorService
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 import scala.util.Try
 
 import scala.meta.inputs.Input
@@ -298,7 +299,7 @@ class Compilers(
       .complete(offsetParams)
       .asScala
       .map(list =>
-        list.getItems.asScala
+        list.getItems.asScala.toSeq
           .map(
             toDebugCompletionItem(
               _,
@@ -715,7 +716,7 @@ class Compilers(
   ): PresentationCompiler = {
     newCompiler(
       mtags,
-      scalac.getOptions().asScala,
+      scalac.getOptions().asScala.toSeq,
       classpath,
       search,
       scalac.getTarget.getUri

metals/src/main/scala/scala/meta/internal/metals/DefinitionProvider.scala

@@ -5,6 +5,7 @@ import java.{util => ju}
 
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 
 import scala.meta.inputs.Input
 import scala.meta.internal.metals.MetalsEnrichments._

metals/src/main/scala/scala/meta/internal/metals/Diagnostics.scala

@@ -6,6 +6,7 @@ import java.{util => ju}
 
 import scala.collection.concurrent.TrieMap
 import scala.collection.mutable
+import scala.jdk.CollectionConverters._
 
 import scala.meta.inputs.Input
 import scala.meta.internal.metals.MetalsEnrichments._
@@ -118,7 +119,7 @@ final class Diagnostics(
     val path = params.getTextDocument.getUri.toAbsolutePath
     onPublishDiagnostics(
       path,
-      params.getDiagnostics().asScala.map(_.toLSP),
+      params.getDiagnostics().asScala.map(_.toLSP).toSeq,
       params.getReset()
     )
   }

metals/src/main/scala/scala/meta/internal/metals/DocumentHighlightProvider.scala

@@ -1,5 +1,7 @@
 package scala.meta.internal.metals
 
+import scala.jdk.CollectionConverters._
+
 import scala.meta.internal.metals.MetalsEnrichments._
 import scala.meta.internal.mtags.DefinitionAlternatives.GlobalSymbol
 import scala.meta.internal.mtags.Semanticdbs

metals/src/main/scala/scala/meta/internal/metals/Embedded.scala

@@ -5,8 +5,8 @@ import java.nio.file.Path
 import java.util.ServiceLoader
 
 import scala.collection.concurrent.TrieMap
+import scala.jdk.CollectionConverters._
 
-import scala.meta.internal.metals.MetalsEnrichments._
 import scala.meta.internal.pc.ScalaPresentationCompiler
 import scala.meta.internal.worksheets.MdocClassLoader
 import scala.meta.io.Classpath

metals/src/main/scala/scala/meta/internal/metals/FileDecoderProvider.scala

@@ -11,6 +11,7 @@ import javax.annotation.Nullable
 import scala.annotation.tailrec
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
+import scala.jdk.CollectionConverters._
 import scala.util.Failure
 import scala.util.Properties
 import scala.util.Success

metals/src/main/scala/scala/meta/internal/metals/FormattingProvider.scala

@@ -16,6 +16,7 @@ import java.util.concurrent.atomic.AtomicReference
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
 import scala.concurrent.Promise
+import scala.jdk.CollectionConverters._
 import scala.util.Failure
 import scala.util.Success