From 7d8d01dfb5dc934dc57f08d9e24be38c67270ea3 Mon Sep 17 00:00:00 2001
From: megri <teknocide@gmail.com>
Date: Mon, 12 Jun 2017 23:55:20 +0200
Subject: Rudimentary Macroparadise plugin, example and test

---
 examples/macroparadise-example/Hello.scala       |  6 +++++
 examples/macroparadise-example/build/build.scala | 19 +++++++++++++++
 examples/macroparadise-example/macros/Main.scala | 25 +++++++++++++++++++
 stage2/plugins/Macroparadise.scala               | 31 ++++++++++++++++++++++++
 test/test.scala                                  |  6 +++++
 5 files changed, 87 insertions(+)
 create mode 100644 examples/macroparadise-example/Hello.scala
 create mode 100644 examples/macroparadise-example/build/build.scala
 create mode 100644 examples/macroparadise-example/macros/Main.scala
 create mode 100644 stage2/plugins/Macroparadise.scala

diff --git a/examples/macroparadise-example/Hello.scala b/examples/macroparadise-example/Hello.scala
new file mode 100644
index 0000000..7e04dcb
--- /dev/null
+++ b/examples/macroparadise-example/Hello.scala
@@ -0,0 +1,6 @@
+package macroparadise_example
+import macros._
+
+@Main object Hello{
+  println("hello, world!")
+}
diff --git a/examples/macroparadise-example/build/build.scala b/examples/macroparadise-example/build/build.scala
new file mode 100644
index 0000000..28fb206
--- /dev/null
+++ b/examples/macroparadise-example/build/build.scala
@@ -0,0 +1,19 @@
+package macroparadise_example_build
+import cbt._
+
+trait SharedSettings extends Macroparadise{
+  override def defaultScalaVersion = "2.12.2"
+}
+
+class Build(val context: Context) extends SharedSettings{
+  override def dependencies =
+    super.dependencies :+
+    new MacroBuild( context.copy( workingDirectory = projectDirectory / "macros" ) )
+}
+
+class MacroBuild(val context: Context) extends SharedSettings{
+  override def dependencies =
+    super.dependencies :+
+    Resolver( mavenCentral ).bindOne( ScalaDependency( "org.scalameta", "scalameta", "1.8.0" ) )
+}
+
diff --git a/examples/macroparadise-example/macros/Main.scala b/examples/macroparadise-example/macros/Main.scala
new file mode 100644
index 0000000..ecdce34
--- /dev/null
+++ b/examples/macroparadise-example/macros/Main.scala
@@ -0,0 +1,25 @@
+package macroparadise_example.macros
+
+import scala.meta._
+import scala.collection.immutable.Seq
+
+class Main extends scala.annotation.StaticAnnotation {
+  inline def apply(defn: Any): Any = meta {
+    defn match {
+      case q"object $name { ..$stats }" =>
+        MainMacroImpl.expand(name, stats)
+      case _ =>
+        abort("@main must annotate an object.")
+    }
+  }
+}
+
+// This is an example how we can refactor the macro implementation into a utility
+// function which can be used for unit testing, see MainUnitTest.
+object MainMacroImpl {
+  def expand(name: Term.Name, stats: Seq[Stat]): Defn.Object = {
+    val main = q"def main(args: Array[String]): Unit = { ..$stats }"
+    q"object $name { $main }"
+  }
+}
+
diff --git a/stage2/plugins/Macroparadise.scala b/stage2/plugins/Macroparadise.scala
new file mode 100644
index 0000000..2b05c92
--- /dev/null
+++ b/stage2/plugins/Macroparadise.scala
@@ -0,0 +1,31 @@
+package cbt
+import java.io.File
+
+trait Macroparadise extends BaseBuild{
+  def macroParadiseVersion = "3.0.0-M9"
+
+  override def scalacOptions = super.scalacOptions ++ Macroparadise.scalacOptions(
+    Macroparadise.dependencies( scalaVersion, macroParadiseVersion, context.cbtLastModified, context.paths.mavenCache ).jar
+  )
+}
+
+object Macroparadise{
+  def dependencies(
+    scalaVersion: String, macroParadiseVersion: 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", "paradise_"+scalaVersion, macroParadiseVersion
+      )
+    )
+
+  def scalacOptions( jarPath: File ) =
+    Seq(
+      "-Xplugin:" ++ jarPath.string,
+      "-Yrangepos",
+      "-Xplugin-require:macroparadise"
+    )
+}
+
diff --git a/test/test.scala b/test/test.scala
index 74177c5..087bbd9 100644
--- a/test/test.scala
+++ b/test/test.scala
@@ -421,6 +421,12 @@ object Main{
       assert(res.out.contains("All tests passed"), res.out)
     }
 
+    {
+      val res = runCbt("../examples/macroparadise-example", Seq("run"))
+      assert(res.exit0)
+      assert(res.out.contains("hello, world!"), res.out)
+    }
+
     {
       val res = runCbt("../examples/resources-example", Seq("run"))
       assert(res.exit0)
-- 
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