From 11b21a1042dd4bb5007ff3e7eaf18b5e7dbdf8dd Mon Sep 17 00:00:00 2001
From: Johannes Rudolph <johannes.rudolph@gmail.com>
Date: Tue, 1 Mar 2016 14:29:56 +0100
Subject: make this an AutoPlugin, fixes #19

---
 README.md                                          | 13 ++--
 .../spray/boilerplate/BoilerplatePlugin.scala      | 85 ++++++++++++----------
 2 files changed, 51 insertions(+), 47 deletions(-)

diff --git a/README.md b/README.md
index 481144b..3e37902 100644
--- a/README.md
+++ b/README.md
@@ -78,13 +78,13 @@ This now expands correctly to
 
 Put
 
-    addSbtPlugin("io.spray" % "sbt-boilerplate" % "0.5.9")
+    addSbtPlugin("io.spray" % "sbt-boilerplate" % "0.6.0")
 
-into your `plugins.sbt` and add
+into your `plugins.sbt`. sbt-boilerplate is an `AutoPlugin` which needs to be enabled using
 
-    Boilerplate.settings
-
-to your `build.sbt`.
+```scala
+enablePlugins(spray.boilerplate.BoilerplatePlugin)
+```
 
 The templates have to be put into the `src/main/boilerplate` directory and the file name
 must end with `.template`. The generated files will be put into the same hierarchy as they
@@ -93,8 +93,7 @@ filename has no extension ".scala" is added automatically.
 
 ## Known issues
 
- * The maximum number of arguments, 22, is hard-coded.
- * Instances for 0 arguments have to be supplied manually.
+ * Instances for zero arguments have to be supplied manually.
 
 ## Projects using sbt-boilerplate
  
diff --git a/src/main/scala/spray/boilerplate/BoilerplatePlugin.scala b/src/main/scala/spray/boilerplate/BoilerplatePlugin.scala
index 0e63014..9394be8 100644
--- a/src/main/scala/spray/boilerplate/BoilerplatePlugin.scala
+++ b/src/main/scala/spray/boilerplate/BoilerplatePlugin.scala
@@ -9,51 +9,56 @@ package spray.boilerplate
 import sbt._
 import Keys._
 
-object BoilerplatePlugin extends Plugin {
-  object Boilerplate {
+object BoilerplatePlugin extends AutoPlugin {
+  override def trigger: PluginTrigger = noTrigger
+  override def `requires`: Plugins = empty
+
+  object autoImport {
     val boilerplateGenerate = taskKey[Seq[File]]("Generates boilerplate from template files")
     val boilerplateSource = settingKey[File]("Default directory containing boilerplate template sources.")
+  }
+
+  import autoImport._
+
+  override def projectSettings: Seq[Def.Setting[_]] =
+    inConfig(Compile)(rawBoilerplateSettings) ++ inConfig(Test)(rawBoilerplateSettings)
+
+  private def rawBoilerplateSettings: Seq[Setting[_]] = {
+    val inputFilter = "*.template"
+    Seq(
+      boilerplateSource := sourceDirectory.value / "boilerplate",
+      watchSources in Defaults.ConfigGlobal ++= ((boilerplateSource.value ** inputFilter) --- (boilerplateSource.value ** excludeFilter.value ** inputFilter)).get,
+      boilerplateGenerate := generateFromTemplates(streams.value, boilerplateSource.value, sourceManaged.value),
+      mappings in packageSrc ++= managedSources.value pair (Path.relativeTo(sourceManaged.value) | Path.flat),
+      sourceGenerators <+= boilerplateGenerate)
+  }
+
+  def generateFromTemplates(streams: TaskStreams, sourceDir: File, targetDir: File): Seq[File] = {
+    val files = sourceDir ** "*.template"
 
-    private def rawBoilerplateSettings: Seq[Setting[_]] = {
-      val inputFilter = "*.template"
-      Seq(
-        boilerplateSource := sourceDirectory.value / "boilerplate",
-        watchSources in Defaults.ConfigGlobal ++= ((boilerplateSource.value ** inputFilter) --- (boilerplateSource.value ** excludeFilter.value ** inputFilter)).get,
-        boilerplateGenerate := generateFromTemplates(streams.value, boilerplateSource.value, sourceManaged.value),
-        mappings in packageSrc ++= managedSources.value x (Path.relativeTo(sourceManaged.value) | Path.flat),
-        sourceGenerators <+= boilerplateGenerate)
+    def changeExtension(f: File): File = {
+      val (_, name) = f.getName.reverse.span(_ != '.')
+      val strippedName = name.drop(1).reverse.toString
+      val newName =
+        if (!strippedName.contains(".")) s"$strippedName.scala"
+        else strippedName
+      new File(f.getParent, newName)
     }
 
-    val settings =
-      inConfig(Compile)(rawBoilerplateSettings) ++ inConfig(Test)(rawBoilerplateSettings)
-
-    def generateFromTemplates(streams: TaskStreams, sourceDir: File, targetDir: File): Seq[File] = {
-      val files = sourceDir ** "*.template"
-
-      def changeExtension(f: File): File = {
-        val (_, name) = f.getName.reverse.span(_ != '.')
-        val strippedName = name.drop(1).reverse.toString
-        val newName =
-          if (!strippedName.contains(".")) s"$strippedName.scala"
-          else strippedName
-        new File(f.getParent, newName)
-      }
-
-      val mapping = (files x rebase(sourceDir, targetDir)).map {
-        case (orig, target) ⇒ (orig, changeExtension(target))
-      }
-
-      mapping foreach {
-        case (templateFile, target) ⇒
-          if (templateFile.lastModified > target.lastModified) {
-            streams.log.info("Generating '%s'" format target.getName)
-            val template = IO.read(templateFile)
-            IO.write(target, Generator.generateFromTemplate(template, 22))
-          } else
-            streams.log.debug("Template '%s' older than target. Ignoring." format templateFile.getName)
-      }
-
-      mapping.map(_._2)
+    val mapping = (files pair rebase(sourceDir, targetDir)).map {
+      case (orig, target) ⇒ (orig, changeExtension(target))
     }
+
+    mapping foreach {
+      case (templateFile, target) ⇒
+        if (templateFile.lastModified > target.lastModified) {
+          streams.log.info("Generating '%s'" format target.getName)
+          val template = IO.read(templateFile)
+          IO.write(target, Generator.generateFromTemplate(template, 22))
+        } else
+          streams.log.debug("Template '%s' older than target. Ignoring." format templateFile.getName)
+    }
+
+    mapping.map(_._2)
   }
 }
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