Merge pull request #64 from DavidGregory084/source-options

Add -Xsource and -source options to the ScalacOptions DSL.

build.sbt

@@ -1,3 +1,5 @@
+import com.typesafe.tools.mima.core._
+
 // Common settings
 
 name         := "sbt-tpolecat"
@@ -54,6 +56,64 @@ mimaPreviousArtifacts := Set(
   projectID.value.withRevision("0.2.0")
 )
 
+mimaBinaryIssueFilters ++= Seq(
+  // New ScalacOptions DSL methods
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source210"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source211"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source212"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source213"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source3"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.sourceFuture"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.sourceFutureMigration"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source3Migration"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.source31"
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source210_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source211_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source212_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source213_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source3_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$sourceFuture_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$sourceFutureMigration_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source3Migration_="
+  ),
+  ProblemFilters.exclude[ReversedMissingMethodProblem](
+    "io.github.davidgregory084.ScalacOptions.io$github$davidgregory084$ScalacOptions$_setter_$source31_="
+  )
+)
+
 // Testing
 
 scriptedBufferLog := false

src/main/scala/io/github/davidgregory084/ScalaVersion.scala

@@ -26,12 +26,15 @@ case class ScalaVersion(major: Long, minor: Long, patch: Long) {
 object ScalaVersion {
   val V2_11_0 = ScalaVersion(2, 11, 0)
   val V2_12_0 = ScalaVersion(2, 12, 0)
+  val V2_12_2 = ScalaVersion(2, 12, 2)
   val V2_13_0 = ScalaVersion(2, 13, 0)
+  val V2_13_2 = ScalaVersion(2, 13, 2)
   val V2_13_3 = ScalaVersion(2, 13, 3)
   val V2_13_4 = ScalaVersion(2, 13, 4)
   val V2_13_5 = ScalaVersion(2, 13, 5)
   val V2_13_6 = ScalaVersion(2, 13, 6)
   val V3_0_0  = ScalaVersion(3, 0, 0)
+  val V3_1_0  = ScalaVersion(3, 1, 0)
 
   implicit val scalaVersionOrdering: Ordering[ScalaVersion] =
     Ordering.by(version => (version.major, version.minor, version.patch))

src/main/scala/io/github/davidgregory084/ScalacOptions.scala

@@ -39,6 +39,46 @@ trait ScalacOptions {
   val feature =
     new ScalacOption(List("-feature"))
 
+  /** Enable features that will be available in a future version of Scala, for purposes of early
+    * migration and alpha testing.
+    */
+  def scala3Source(version: String, isSupported: ScalaVersion => Boolean = _ >= V3_0_0) =
+    new ScalacOption(List("-source", version), isSupported)
+
+  /** Enable features that will be available in Scala 3.0.x with Scala 2.x compatibility mode, for
+    * purposes of early migration and alpha testing.
+    *
+    * Same as the enabled default `-source:3.0` but with additional helpers to migrate from 2.13.
+    *
+    * In addition:
+    *   - flags some Scala 2 constructs that are disallowed in Scala 3 as migration warnings instead
+    *     of hard errors
+    *   - changes some rules to be more lenient and backwards compatible with Scala 2.13
+    *   - gives some additional warnings where the semantics has changed between Scala 2.13 and 3.0
+    *   - in conjunction with -rewrite, offer code rewrites from Scala 2.13 to 3.0
+    */
+  val source3Migration = scala3Source("3.0-migration", version => version >= V3_0_0)
+
+  /** Enable features that will be available in future versions of Scala 3.x, for purposes of early
+    * migration and alpha testing.
+    */
+  val sourceFuture = scala3Source("future", version => version >= V3_0_0)
+
+  /** Enable features that will be available in future versions of Scala 3.x with Scala 2.x
+    * compatibility mode, for purposes of early migration and alpha testing.
+    *
+    * Same as `-source:future` but with additional helpers to migrate from 3.0.
+    *
+    * Similarly to the helpers available under 3.0-migration, these include migration warnings and
+    * optional rewrites.
+    */
+  val sourceFutureMigration = scala3Source("future-migration", version => version >= V3_0_0)
+
+  /** Enable features that will be available in Scala 3.1.x, for purposes of early migration and
+    * alpha testing.
+    */
+  val source31 = scala3Source("3.1", version => version >= V3_1_0)
+
   /** Enable or disable language features
     */
   def languageFeatureOption(name: String, isSupported: ScalaVersion => Boolean = _ => true) =
@@ -257,6 +297,36 @@ trait ScalacOptions {
     disableLintBynameImplicit
   )
 
+  /** Treat compiler input as Scala source for the specified version.
+    */
+  def source(version: String, isSupported: ScalaVersion => Boolean = _ >= V3_0_0) =
+    advancedOption(s"source:$version", isSupported)
+
+  /** Treat compiler input as Scala source for version 2.10.
+    */
+  val source210 = source("2.10", version => version < V2_13_2)
+
+  /** Treat compiler input as Scala source for version 2.11.
+    */
+  val source211 = source("2.11", version => version < V2_13_2)
+
+  /** Treat compiler input as Scala source for version 2.12.
+    */
+  val source212 = source("2.12", version => version < V2_13_2)
+
+  /** Treat compiler input as Scala source for version 2.13.
+    */
+  val source213 = source("2.13", version => version.isBetween(V2_12_2, V3_0_0))
+
+  /** Treat compiler input as Scala source for version 3.x:
+    *
+    *   - Most deprecated syntax generates an error.
+    *   - Infix operators can start a line in the middle of a multiline expression.
+    *   - Implicit search and overload resolution follow Scala 3 handling of contravariance when
+    *     checking specificity.
+    */
+  val source3 = source("3", version => version.isBetween(V2_12_2, V3_0_0))
+
   /** Advanced options (-X)
     */
   val advancedOptions: Set[ScalacOption] = ListSet(

src/sbt-test/sbt-tpolecat/scalacOptions/build.sbt

@@ -15,6 +15,11 @@ crossScalaVersions := Seq(
   Scala31
 )
 
+tpolecatDevModeOptions ++= Set(
+  ScalacOptions.source213,
+  ScalacOptions.source3Migration
+)
+
 tpolecatReleaseModeOptions ++= ScalacOptions.optimizerOptions("**")
 
 val Scala211Options =
@@ -96,7 +101,8 @@ val Scala212Options =
     "-Ywarn-unused:locals",
     "-Ywarn-unused:params",
     "-Ywarn-unused:patvars",
-    "-Ywarn-unused:privates"
+    "-Ywarn-unused:privates",
+    "-Xsource:2.13"
   )
 
 val Scala213Options =
@@ -140,7 +146,8 @@ val Scala213Options =
     "-Wunused:locals",
     "-Wunused:params",
     "-Wunused:patvars",
-    "-Wunused:privates"
+    "-Wunused:privates",
+    "-Xsource:2.13"
   )
 
 val Scala30Options =
@@ -153,7 +160,9 @@ val Scala30Options =
     "-language:experimental.macros",
     "-language:higherKinds",
     "-language:implicitConversions",
-    "-Ykind-projector"
+    "-Ykind-projector",
+    "-source",
+    "3.0-migration"
   )
 
 val Scala31Options =
@@ -166,7 +175,9 @@ val Scala31Options =
     "-language:experimental.macros",
     "-language:higherKinds",
     "-language:implicitConversions",
-    "-Ykind-projector"
+    "-Ykind-projector",
+    "-source",
+    "3.0-migration"
   )
 
 TaskKey[Unit]("checkDevMode") := {