Get local scalafix working

Author: japgolly

.scalafix.conf

@@ -0,0 +1,6 @@
+rules = []
+
+// Run automatically via (scalafixOnCompile := true)
+triggered.rules = [
+  Mima,
+]

build.sbt

@@ -1,15 +1,22 @@
 import scalatex.ScalatexReadme
 
-lazy val root = project.in(file(".")).
-  enablePlugins(ScalaJSPlugin)
+ThisBuild / shellPrompt  := ((s: State) => Project.extract(s).currentRef.project + "> ")
+
+lazy val root = project
+  .in(file("."))
+  .enablePlugins(ScalaJSPlugin)
+  .enablePlugins(ScalafixPlugin)
+  .dependsOn(mima % ScalafixConfig)
+  .settings(scalafixOnCompile := true)
 
 name := "Scala.js DOM"
 
 ThisBuild / crossScalaVersions := {
   if (scalaJSVersion.startsWith("1.")) Seq("2.12.10", "2.11.12", "2.13.1")
   else Seq("2.12.10", "2.11.12", "2.10.7", "2.13.1")
 }
-ThisBuild / scalaVersion := crossScalaVersions.value.head
+// ThisBuild / scalaVersion := crossScalaVersions.value.head
+ThisBuild / scalaVersion := "2.13.1"
 
 val commonSettings = Seq(
   organization := "org.scala-js",
@@ -110,3 +117,13 @@ lazy val example = project.
   settings(commonSettings: _*).
   settings(noPublishSettings: _*).
   dependsOn(root)
+
+
+import _root_.scalafix.sbt.BuildInfo.scalafixVersion
+
+lazy val mima = project
+  .in(file("mima"))
+  .enablePlugins(ScalaJSPlugin)
+  .settings(
+    libraryDependencies += "ch.epfl.scala" %% "scalafix-core" % scalafixVersion,
+  )

mima/src/main/resources/META-INF/services/scalafix.v1.Rule

@@ -0,0 +1 @@
+mima.Mima

mima/src/main/scala/mima/Mima.scala

@@ -0,0 +1,11 @@
+package mima
+
+import scalafix.v1._
+
+class Mima extends SemanticRule("Mima") {
+
+  override def fix(implicit doc: SemanticDocument): Patch = {
+    println("hello")
+    Patch.empty
+  }
+}

project/plugins.sbt

@@ -8,3 +8,5 @@ addSbtPlugin("com.lihaoyi" % "scalatex-sbt-plugin" % "0.3.11")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.0.0")
 
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.7")
+
+addSbtPlugin("ch.epfl.scala"  % "sbt-scalafix" % "0.9.29")

scalafix.sbt

@@ -0,0 +1,10 @@
+ThisBuild / semanticdbEnabled          := true
+ThisBuild / semanticdbVersion          := "4.4.26"
+ThisBuild / scalafixScalaBinaryVersion := CrossVersion.binaryScalaVersion(scalaVersion.value)
+
+ThisBuild / scalacOptions ++= {
+  if (scalaVersion.value startsWith "2")
+    "-Yrangepos" :: Nil
+  else
+    Nil
+}