From 2c792df95d36d61c55b07ddfa13387cf79371bdb Mon Sep 17 00:00:00 2001
From: Christopher Vogt <oss.nsp@cvogt.org>
Date: Mon, 27 Mar 2017 19:33:59 -0400
Subject: add scala meta and scalafix plugin

---
 plugins/scalafix/Scalafix.scala    | 66 ++++++++++++++++++++++++++++++++++++++
 plugins/scalafix/build/build.scala | 27 ++++++++++++++++
 stage2/plugins.scala               |  1 +
 stage2/plugins/Scalameta.scala     | 26 +++++++++++++++
 4 files changed, 120 insertions(+)
 create mode 100644 plugins/scalafix/Scalafix.scala
 create mode 100644 plugins/scalafix/build/build.scala
 create mode 100644 stage2/plugins/Scalameta.scala

diff --git a/plugins/scalafix/Scalafix.scala b/plugins/scalafix/Scalafix.scala
new file mode 100644
index 0000000..e95840c
--- /dev/null
+++ b/plugins/scalafix/Scalafix.scala
@@ -0,0 +1,66 @@
+package cbt
+
+import java.io.File
+
+import scala.meta._
+import scala.meta.semantic.v1._
+import scala.meta.{ Symbol => _, _ }
+import scalafix._, rewrite._, config._, util._
+import org.scalameta.{logger => scalametaLogger}
+
+import cbt._
+
+trait Scalafix extends Scalameta{
+  def scalafix = Scalafix.apply( lib ).config(
+    classpath,
+    sourceFiles zip sourceFiles
+  )
+}
+
+object Scalafix{
+  case class apply( lib: Lib ){
+    case class config(
+      classpath: ClassPath,
+      files: Seq[(File,File)],
+      patches: Seq[Patch] = Seq(),
+      rewrites: Seq[ Rewrite[ScalafixMirror] ] = Seq(),
+      allowEmpty: Boolean = false
+    ){
+      def mirror =
+        Mirror(
+          classpath.string,
+          files.map(_._1).mkString(File.pathSeparator)
+        )
+
+      def context(file: File): ( RewriteCtx[Mirror], RewriteCtx[ScalafixMirror] ) = (
+        scalafix.rewrite.RewriteCtx(
+          mirror.dialect(file).parse[Source].get, ScalafixConfig(), mirror
+        ),
+        scalafix.rewrite.RewriteCtx(
+          mirror.dialect(file).parse[Source].get, ScalafixConfig(), ScalafixMirror.fromMirror( mirror )
+        )
+      )
+
+      def apply: Unit = {
+        require(
+          allowEmpty || rewrites.nonEmpty || patches.nonEmpty,
+          "You need to provide some rewrites via: `override def scalafix = super.scalafix.copy( rewrites = Seq(...) )`"
+        )
+        files.foreach{ case (from, to) =>
+          implicit val ( ctx, ctx2 ) = context(from)
+          lib.writeIfChanged(
+            to,
+            Patch(
+              (
+                patches
+                ++ rewrites.flatMap(
+                  _.rewrite( ctx2 ).to
+                )
+              ).to
+            )
+          )
+        }
+      }
+    }
+  }
+}
diff --git a/plugins/scalafix/build/build.scala b/plugins/scalafix/build/build.scala
new file mode 100644
index 0000000..02dcc0c
--- /dev/null
+++ b/plugins/scalafix/build/build.scala
@@ -0,0 +1,27 @@
+package scalafix_build
+
+import cbt._
+
+class Build(val context: Context) extends Plugin {
+  override def dependencies = super.dependencies ++ Seq(
+    //plugins.scalameta
+  ) :+ Resolver( mavenCentral ).bindOne(
+    ScalaDependency(
+      "ch.epfl.scala", "scalafix-core", "0.3.2"
+    )
+  ).copy(
+    // required until https://github.com/scalacenter/scalafix/issues/100 is fixed
+    replace = _ => _.flatMap{
+      case m@MavenDependency("org.scalameta", artifactId,_,_,_)
+        if (artifactId startsWith "scalahost_")
+        || (artifactId startsWith "contrib_")
+        => Seq( m )
+      case MavenDependency("org.scalameta", _,_,_,_) => Seq(
+        MavenDependency(
+          "org.scalameta", "scalahost_" ++ scalaVersion, "1.6.0"
+        )
+      )
+      case other => Seq( other )
+    }
+  )
+}
diff --git a/stage2/plugins.scala b/stage2/plugins.scala
index b1638da..6c5ee29 100644
--- a/stage2/plugins.scala
+++ b/stage2/plugins.scala
@@ -5,6 +5,7 @@ class plugins( implicit context: Context ) {
   final lazy val googleJavaFormat = plugin( "google-java-format" )
   final lazy val proguard = plugin( "proguard" )
   final lazy val sbtLayout = plugin( "sbt_layout" )
+  final lazy val scalafix = plugin( "scalafix" )
   final lazy val scalafixCompilerPlugin = plugin( "scalafix-compiler-plugin" )
   final lazy val scalafmt = plugin( "scalafmt" )
   final lazy val scalaJs = plugin( "scalajs" )
diff --git a/stage2/plugins/Scalameta.scala b/stage2/plugins/Scalameta.scala
new file mode 100644
index 0000000..663399d
--- /dev/null
+++ b/stage2/plugins/Scalameta.scala
@@ -0,0 +1,26 @@
+package cbt
+import java.io.File
+trait Scalameta extends BaseBuild{
+  override def scalacOptions = super.scalacOptions ++ Scalameta.scalacOptions(
+    Scalameta.scalaHost( scalaVersion, context.cbtLastModified, context.paths.mavenCache ).jar
+  )
+}
+object Scalameta{
+  def scalaHost(
+    scalaVersion: String, cbtLastModified: Long, mavenCache: java.io.File
+  )(
+    implicit logger: Logger, transientCache: java.util.Map[AnyRef,AnyRef], classLoaderCache: ClassLoaderCache
+  ) =
+    MavenResolver( cbtLastModified, mavenCache, mavenCentral ).bindOne(
+      MavenDependency(
+        "org.scalameta", "scalahost_"+scalaVersion, "1.6.0"
+      )
+    )
+
+  def scalacOptions( scalaHost: File ) =
+    Seq(
+      "-Xplugin:" ++ scalaHost.string,
+      "-Yrangepos",
+      "-Xplugin-require:scalahost"
+    )
+}
-- 
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