Update Scala version.

.gitignore

@@ -0,0 +1,36 @@
+stasis-test/original/
+
+*.class
+*.log
+
+gh-pages/
+.secrets
+
+idea/
+
+.bloop
+.metals
+
+repos.tar.gz
+
+# sbt specific
+.cache
+.history
+.lib/
+dist/*
+target/
+lib_managed/
+src_managed/
+project/boot/
+project/plugins/project/
+
+# Scala-IDE specific
+.scala_dependencies
+.worksheet
+.idea
+.idea.bak/
+intellij/out
+
+
+*~
+docs/xx.md

build.sbt

@@ -2,10 +2,73 @@ import Dependencies._
 
 def scala211 = "2.11.12"
 def scala212 = "2.12.9"
-def scala213 = "2.13"
+def scala213 = "2.13.1"
 
+organization := "io.stasis"
 name := "stasis"
 
+def scalacOptionsForVersion(version: String): Seq[String] = {
+  // format: off
+  val defaultOpts = Seq(
+    "-deprecation",                      // Emit warning and location for usages of deprecated APIs.
+    "-encoding", "utf-8",                // Specify character encoding used by source files.
+    "-explaintypes",                     // Explain type errors in more detail.
+    "-feature",                          // Emit warning and location for usages of features that should be imported explicitly.
+    "-language:existentials",            // Existential types (besides wildcard types) can be written and inferred
+    "-language:experimental.macros",     // Allow macro definition (besides implementation and application)
+    "-language:higherKinds",             // Allow higher-kinded types
+    "-language:implicitConversions",     // Allow definition of implicit functions called views
+    "-unchecked",                        // Enable additional warnings where generated code depends on assumptions.
+    "-Xcheckinit",                       // Wrap field accessors to throw an exception on uninitialized access.
+    "-Xlint:adapted-args",               // Warn if an argument list is modified to match the receiver.
+    "-Xlint:constant",                   // Evaluation of a constant arithmetic expression results in an error.
+    "-Xlint:delayedinit-select",         // Selecting member of DelayedInit.
+    "-Xlint:doc-detached",               // A Scaladoc comment appears to be detached from its element.
+    "-Xlint:inaccessible",               // Warn about inaccessible types in method signatures.
+    "-Xlint:infer-any",                  // Warn when a type argument is inferred to be `Any`.
+    "-Xlint:missing-interpolator",       // A string literal appears to be missing an interpolator id.
+    "-Xlint:nullary-override",           // Warn when non-nullary `def f()' overrides nullary `def f'.
+    "-Xlint:nullary-unit",               // Warn when nullary methods return Unit.
+    "-Xlint:option-implicit",            // Option.apply used implicit view.
+    "-Xlint:package-object-classes",     // Class or object defined in package object.
+    "-Xlint:poly-implicit-overload",     // Parameterized overloaded implicit methods are not visible as view bounds.
+    "-Xlint:private-shadow",             // A private field (or class parameter) shadows a superclass field.
+    "-Xlint:stars-align",                // Pattern sequence wildcard must align with sequence component.
+    "-Xlint:type-parameter-shadow",      // A local type parameter shadows a type already in scope.
+    "-Ywarn-dead-code",                  // Warn when dead code is identified.
+    "-Ywarn-extra-implicit",             // Warn when more than one implicit parameter section is defined.
+    "-Ywarn-numeric-widen",              // Warn when numerics are widened.
+    "-Ywarn-unused:implicits",           // Warn if an implicit parameter is unused.
+    "-Ywarn-unused:imports",             // Warn if an import selector is not referenced.
+    "-Ywarn-unused:locals",              // Warn if a local definition is unused.
+    "-Ywarn-unused:params",              // Warn if a value parameter is unused.
+    "-Ywarn-unused:patvars",             // Warn if a variable bound in a pattern is unused.
+    "-Ywarn-unused:privates",            // Warn if a private member is unused.
+    "-Ywarn-value-discard",              // Warn when non-Unit expression results are unused.
+  )
+  val versionOpts: Seq[String] = CrossVersion.partialVersion(version) match {
+    case Some((2, major)) if major < 13 => Seq(
+      "-Xlint:by-name-right-associative",  // By-name parameter of right associative operator.
+      "-Xlint:unsound-match",              // Pattern match may not be typesafe.
+      "-Xfatal-warnings",                  // Fail the compilation if there are any warnings.
+      "-Xfuture",                          // Turn on future language features.
+      "-Yno-adapted-args",                 // Do not adapt an argument list (either by inserting () or creating a tuple) to match the receiver.
+      "-Ypartial-unification",             // Enable partial unification in type constructor inference
+      "-Ywarn-inaccessible",               // Warn about inaccessible types in method signatures.
+      "-Ywarn-infer-any",                  // Warn when a type argument is inferred to be `Any`.
+      "-Ywarn-nullary-override",           // Warn when non-nullary `def f()' overrides nullary `def f'.
+      "-Ywarn-nullary-unit",               // Warn when nullary methods return Unit.
+    )
+    case _ => Seq()
+  }
+  defaultOpts ++ versionOpts
+  // format: on
+}
+
+addCompilerPlugin(
+  ("org.typelevel" %% "kind-projector" % "0.10.3").cross(CrossVersion.binary),
+)
+
 inThisBuild(
   Seq(
     organization := "io.stasis",
@@ -22,14 +85,10 @@ inThisBuild(
         url("https://greg.burd.me")
       )
     ),
-    scalaVersion := scala212,
+    scalaVersion := scala213,
     crossScalaVersions := List(scala213, scala212, scala211),
     resolvers += Resolver.sonatypeRepo("releases"),
-    scalacOptions ++= Seq(
-      "-unchecked"
-      , "-deprecation"
-//      , "-Xfatal-warnings"
-    ),
+    scalacOptions ++= scalacOptionsForVersion(scalaVersion.value),
     libraryDependencies ++= Seq(
       scalatest.value % Test,
       scalacheck % Test,
@@ -196,3 +255,9 @@ lazy val buildInfoSettings: Seq[Def.Setting[_]] = Seq(
   buildInfoPackage := "io.stasis",
   buildInfoObject := "Versions"
 )
+
+// Filter out compiler flags to make the repl experience functional...
+val badConsoleFlags = Seq("-Xfatal-warnings", "-Ywarn-unused:imports")
+scalacOptions in (Compile, console) ~= (_.filterNot(badConsoleFlags.contains(_)))
+
+enablePlugins(ScalafmtPlugin, JavaAppPackaging, GhpagesPlugin, MicrositesPlugin, TutPlugin)

project/Dependencies.scala

@@ -5,9 +5,9 @@ import org.portablescala.sbtplatformdeps.PlatformDepsPlugin.autoImport._
 
 object Dependencies {
   val metaconfigV = "0.8.3"
-  val scalametaV = "4.0.0"
-  val scalatestV = "3.2.0-SNAP10"
-  val scalacheckV = "1.13.5"
+  val scalametaV = "4.2.3"
+  val scalatestV = "3.2.0-M1"
+  val scalacheckV = "1.14.1"
   val coursier = "1.0.3"
 
   val scalapb = Def.setting {

project/build.properties

@@ -1 +1 @@
-sbt.version = 1.2.8
+sbt.version = 1.3.2

project/plugins.sbt

@@ -2,20 +2,40 @@ logLevel := Level.Warn
 
 resolvers ++= Seq(
   Classpaths.sbtPluginReleases,
+  "Local Maven Repository" at Path.userHome.asFile.toURI.toURL + ".m2/repository",
+  "Local Ivy2 Cache Repository" at Path.userHome.asFile.toURI.toURL + ".ivy2/cache",
+  Resolver.sonatypeRepo("snapshots"),
   Resolver.typesafeRepo("releases"),
   Resolver.sonatypeRepo("releases"),
   Resolver.bintrayIvyRepo("jetbrains", "sbt-plugins")
 )
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.3.7")
+
+// Use the Dotty compiler for Scala code.
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.3.4")
+
+// Makes our code tidy
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.0.5")
+
+// Revolver allows us to use re-start and work a lot faster!
+addSbtPlugin("io.spray" % "sbt-revolver" % "0.9.1")
+
+// Native Packager allows us to create standalone jar
+addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.4.1")
+
+// Documentation plugins
+addSbtPlugin("org.tpolecat" % "tut-plugin" % "0.6.12")
+addSbtPlugin("com.47deg" % "sbt-microsites" % "0.9.4")
+addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.3")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "1.2.7")
-addSbtPlugin("com.geirsson" % "sbt-scalafmt" % "1.6.0-RC4")
+
+// Other, TBD
+addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.3.4")
+addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.0")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.3.7")
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.2.2")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.7.0")
 addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.3") //coursier.util.Properties.version) // "2.0.0-RC2-3"
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.7")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.3.4")
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.5.0")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.1.18")
-addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.9.0")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.5.1")
-addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.3.4")