Setup skeleton for rewriting with scalafix.

Author: olafurpg

build.sbt

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+// Use a scala version supported by scalafix.
+scalaVersion in ThisBuild := org.scalameta.BuildInfo.supportedScalaVersions.last
+
+lazy val root = project.aggregate(rewrites, input, output, tests)
+
+lazy val rewrites = project.settings(
+  libraryDependencies += "ch.epfl.scala" %% "scalafix-core" % "0.4.2"
+)
+
+lazy val input = project.settings(
+  scalametaSourceroot := sourceDirectory.in(Compile).value
+)
+
+lazy val output = project
+
+lazy val tests = project
+  .settings(
+    libraryDependencies += "ch.epfl.scala" % "scalafix-testkit" % "0.4.2" % Test cross CrossVersion.full,
+    buildInfoPackage := "fix",
+    buildInfoKeys := Seq[BuildInfoKey](
+      "inputSourceroot" ->
+        sourceDirectory.in(input, Compile).value,
+      "outputSourceroot" ->
+        sourceDirectory.in(output, Compile).value,
+      "inputClassdirectory" ->
+        classDirectory.in(input, Compile).value
+    )
+  )
+  .dependsOn(input, rewrites)
+  .enablePlugins(BuildInfoPlugin)

input/src/main/scala/fix/Collectionstrawman_v0.scala

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+/* ONLY
+rewrite = "scala:fix.Collectionstrawman_v0"
+*/
+package fix
+
+object Collectionstrawman_v0_Test {
+  List(1, 2, 3)
+}

output/src/main/scala/fix/Collectionstrawman_v0.scala

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+package fix
+
+import scala.{ List => _ }
+import strawman.collection.immutable.List
+object Collectionstrawman_v0_Test {
+  List(1, 2, 3)
+}

project/build.properties

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+sbt.version=0.13.13

project/plugins.sbt

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+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.4.2")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.4.2")
+addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-RC3")
+addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.6.1")
+

readme.md

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+# Scalafix rewrites for collection-strawman
+
+To develop rewrite:
+```
+sbt ~tests/test
+# edit rewrites/src/main/scala/fix/Collectionstrawman_v0.scala
+```

rewrites/src/main/scala/fix/Collectionstrawman_v0.scala

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+package fix
+
+import scalafix._
+import scala.meta._
+
+case class Collectionstrawman_v0(mirror: Mirror)
+    extends SemanticRewrite(mirror) {
+  val immutableListSymbol = Symbol("_root_.scala.collection.immutable.List.")
+  def rewrite(ctx: RewriteCtx): Patch = {
+    ctx.tree.collect {
+      case name @ Term.Name(_) if name.symbol == immutableListSymbol =>
+        ctx.addGlobalImport(importer"scala.{List => _}") +
+          ctx.addGlobalImport(importer"strawman.collection.immutable.List")
+    }.asPatch
+  }
+}

tests/src/test/scala/fix/Collectionstrawman_Tests.scala

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+package fix
+
+import scala.meta._
+import scalafix.testkit._
+
+class Collectionstrawman_Tests
+  extends SemanticRewriteSuite(
+    Database.load(Classpath(AbsolutePath(BuildInfo.inputClassdirectory))),
+    AbsolutePath(BuildInfo.inputSourceroot),
+    Seq(AbsolutePath(BuildInfo.outputSourceroot))
+  ) {
+  runAllTests()
+}