Upgrade to scalafix 0.5.0-M3.

Author: olafurpg

build.sbt

@@ -1,6 +1,9 @@
 def scalafixVersion = _root_.scalafix.Versions.version
-// Use a scala version supported by scalafix.
-scalaVersion in ThisBuild := org.scalameta.BuildInfo.supportedScalaVersions.last
+inScope(Global)(
+  List(
+    scalaVersion := _root_.scalafix.Versions.scala212
+  )
+)
 
 lazy val root = project
   .in(file("."))
@@ -11,7 +14,7 @@ lazy val rewrites = project.settings(
 )
 
 lazy val input = project.settings(
-  scalametaSourceroot := sourceDirectory.in(Compile).value
+  scalafixSourceroot := sourceDirectory.in(Compile).value
 )
 
 val collections = ProjectRef(file(".."), "collections")
@@ -24,7 +27,6 @@ lazy val output = project
     scalaBinaryVersion := scalaBinaryVersion.in(collections).value
   )
   .dependsOn(collections) // collections/publishLocal is still necessary.
-  .disablePlugins(ScalahostSbtPlugin)
 
 lazy val tests = project
   .settings(

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

@@ -1,6 +1,6 @@
 /* ONLY
 rewrite = "scala:fix.Collectionstrawman_v0"
-patches.moveSymbols = [
+patches.replaceSymbols = [
   { from = "scala.collection.immutable.HashMap",
     to   = "strawman.collection.immutable.HashMap" }
   { from = "scala.collection.immutable.Map",

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

@@ -1,11 +1,10 @@
 package fix
 
-import scala.{ List => _, Nil => _, Seq => _, Vector => _, :: => _, #:: => _ }
-import scala.Predef.{ Map => _, augmentString => _, intArrayOps => _, ArrowAssoc, charWrapper}
-import strawman.collection.{ stringToStringOps, arrayToArrayOps }
-import strawman.collection.immutable.{ LazyList, List, Map, Nil, Range, Seq, :: }
+import scala.{ Vector => _, #:: => _, :: => _, Seq => _, List => _ }
+import scala.Predef.{ Map => _ }
+import strawman.collection.immutable.{ HashMap, LazyList, List, Map, Nil, Vector }
 import strawman.collection.immutable.LazyList.#::
-
+import strawman.collection.mutable.ArrayBuffer
 object Collectionstrawman_v0_List {
   List(1, 2, 3)
   1 :: 2 :: 3 :: Nil

project/plugins.sbt

@@ -1,4 +1,4 @@
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.5.0-M1")
-addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-RC6")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.5-SNAPSHOT")
+addSbtPlugin("io.get-coursier" % "sbt-coursier" % "1.0.0-RC9")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.6.1")
 

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

@@ -30,9 +30,8 @@ case class Collectionstrawman_v0(mirror: Mirror) extends SemanticRewrite(mirror)
   }
 
   def ifSymbolFound(ctx: RewriteCtx): Patch = {
-    val toUnimport = ctx.mirror.database.names.flatMap {
-      case (_, sym) =>
-        val norm = normalize(sym)
+    val toUnimport = ctx.mirror.database.names.flatMap { r =>
+        val norm = normalize(r.sym)
         if (unimports.contains(norm)) norm :: Nil
         else Nil
     }
@@ -63,7 +62,6 @@ case class Collectionstrawman_v0(mirror: Mirror) extends SemanticRewrite(mirror)
   }
 
   def rewrite(ctx: RewriteCtx): Patch = {
-    ctx.debugMirror()
     ifSymbolFound(ctx)
   }
 }

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

@@ -2,10 +2,11 @@ package fix
 
 import scala.meta._
 import scalafix.testkit._
+import scalafix._
 
 class Collectionstrawman_Tests
   extends SemanticRewriteSuite(
-    Database.load(Classpath(AbsolutePath(BuildInfo.inputClassdirectory))),
+    SemanticCtx.load(Classpath(AbsolutePath(BuildInfo.inputClassdirectory))),
     AbsolutePath(BuildInfo.inputSourceroot),
     Seq(AbsolutePath(BuildInfo.outputSourceroot))
   ) {