add scala meta and scalafix plugin

2 files changed, 93 insertions, 0 deletions

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 )
+    }
+  )
+}