Replace sbt-header with a shim

project/headershim.scala

@@ -0,0 +1,34 @@
+package de.heikoseeberger.sbtheader
+
+import sbt._
+import sbt.Keys._
+import sbt.plugins.JvmPlugin
+
+object HeaderPlugin extends AutoPlugin {
+
+  final object autoImport {
+    class License
+    object HeaderLicense {
+      case class Custom(s: String) extends License
+    }
+    val headerLicense: SettingKey[Option[License]] = settingKey[Option[License]]("header License")
+
+    val headerSources = taskKey[scala.collection.Seq[File]]("Sources which need headers checked or created.")
+
+    val headerResources = taskKey[scala.collection.Seq[File]]("Resources which need headers checked or created.")
+
+    def headerSettings(configurations: Configuration*): Seq[Setting[_]] =
+      configurations.foldLeft(List.empty[Setting[_]]) { _ ++ inConfig(_)(toBeScopedSettings) }
+  }
+
+  import autoImport._
+
+  override def trigger = allRequirements
+
+  override def requires = JvmPlugin
+
+  override def projectSettings = headerSettings(Compile, Test)
+
+  private def toBeScopedSettings = Vector(headerSources := Nil, headerResources := Nil)
+
+}

project/plugins.sbt

@@ -29,5 +29,3 @@ libraryDependencies ++= Seq(
 concurrentRestrictions in Global := Seq(
   Tags.limitAll(1) // workaround for https://github.com/sbt/sbt/issues/2970
 )
-
-addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.0.0")