From 26bc1f14cad26d2e2c1d93d71fa7ce806ff225c8 Mon Sep 17 00:00:00 2001
From: Sarah Gerweck <sarah.a180@gmail.com>
Date: Tue, 6 Dec 2016 23:25:12 -0800
Subject: [PATCH] Updates to build for 2.12

---
 CHANGELOG.md                |  5 +++
 project/BasicSettings.scala | 84 +++++++++++++++++++++++++------------
 project/Helpers.scala       | 34 +++++----------
 3 files changed, 73 insertions(+), 50 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 770fcf1..6baafe0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,3 +49,8 @@ end users will be listed here.
 #### 0.11.1
 
    * Update to Akka 2.4.11.
+
+#### 0.11.2
+
+   * Update to Akka 2.4.14.
+   * Add support for Scala 2.12
diff --git a/project/BasicSettings.scala b/project/BasicSettings.scala
index 4396317..7209f8d 100644
--- a/project/BasicSettings.scala
+++ b/project/BasicSettings.scala
@@ -62,8 +62,8 @@ object BasicSettings extends AutoPlugin with Basics {
       scalaVersion         :=  buildScalaVersion,
       crossScalaVersions   :=  buildScalaVersions,
 
-      scalacOptions        ++= buildScalacOptions,
-      javacOptions         ++= buildJavacOptions,
+      addScalacOptions(),
+      addJavacOptions(),
       autoAPIMappings      :=  true,
 
       updateOptions        :=  updateOptions.value.withCachedResolution(cachedResolution),
@@ -88,30 +88,62 @@ object BasicSettings extends AutoPlugin with Basics {
 
   lazy val buildScalaVersions = buildScalaVersion +: extraScalaVersions
 
-  val buildScalacOptions = Seq (
-    "-unchecked",
-    "-feature",
-    "-target:jvm-" + minimumJavaVersion
-  ) ++ (
-    if (deprecation) Seq("-deprecation") else Seq.empty
-  ) ++ (
-    if (optimize) Seq("-optimize") else Seq.empty
-  ) ++ (
-    if (inlineWarn) Seq("-Yinline-warnings") else Seq.empty
-  ) ++ (
-    if (unusedWarn) Seq("-Ywarn-unused") else Seq.empty
-  ) ++ (
-    if (importWarn) Seq("-Ywarn-unused-import") else Seq.empty
-  ) ++ (
-    if (newBackend) Seq("-Ybackend:GenBCode", "-Yopt:l:classpath") else Seq.empty
-  )
+  def addScalacOptions(optim: Boolean = optimize) = Def.derive {
+    scalacOptions ++= {
+      val sv = SVer(scalaBinaryVersion.value)
+      var options = Seq.empty[String]
 
-  /* Java build setup */
-  val buildJavacOptions = Seq(
-    "-target", minimumJavaVersion,
-    "-source", minimumJavaVersion
-  ) ++ (
-    if (deprecation) Seq("-Xlint:deprecation") else Seq.empty
-  )
+      options :+= "-unchecked"
+      options :+= "-feature"
+      if (deprecation) {
+        options :+= "-deprecation"
+      }
+      if (inlineWarn) {
+        options :+= "-Yinline-warnings"
+      }
+      if (unusedWarn) {
+        options :+= "-Ywarn-unused"
+      }
+      if (importWarn) {
+        options :+= "-Ywarn-unused-import"
+      }
+      if (!sv.requireJava8) {
+        options :+= "-target:jvm-" + minimumJavaVersion
+      }
+      if (optim) {
+        if (sv.newOptimize || sv.supportsNewBackend && newBackend) {
+          options :+= "-opt:l:project"
+        } else if (!sv.requireJava8) {
+          options :+= "-optimize"
+        }
+      }
+      if (sv.supportsNewBackend && newBackend && !sv.requireJava8) {
+        options :+= "-Ybackend:GenBCode"
+      }
+
+      options
+    }
+  }
+
+  def addJavacOptions() = Def.derive {
+    javacOptions ++= {
+      val sv = SVer(scalaBinaryVersion.value)
+      var options = Seq.empty[String]
+
+      if (sv.requireJava8) {
+        options ++= Seq[String](
+          "-target", "1.8",
+          "-source", "1.8"
+        )
+      } else {
+        options ++= Seq[String](
+          "-target", minimumJavaVersion,
+          "-source", minimumJavaVersion
+        )
+      }
+
+      options
+    }
+  }
 }
 
diff --git a/project/Helpers.scala b/project/Helpers.scala
index 1d74259..4478066 100644
--- a/project/Helpers.scala
+++ b/project/Helpers.scala
@@ -20,41 +20,27 @@ object Helpers {
   }
 
   sealed trait SVer {
-    def requireJava8: Boolean
+    val supportsNewBackend: Boolean = false
+    val requireJava8: Boolean = true
+    val newOptimize: Boolean = false
   }
   object SVer {
     def apply(scalaVersion: String): SVer = {
       scalaVersion match {
-        case "2.10"      => SVer2_10
-        case "2.11"      => SVer2_11
-        case "2.12.0-M1" => SVer2_12M1
-        case "2.12.0-M2" => SVer2_12M2
-        case "2.12.0-M3" => SVer2_12M3
-        case "2.12.0-M4" => SVer2_12M4
-        case "2.12"      => SVer2_12
+        case "2.10"       => SVer2_10
+        case "2.11"       => SVer2_11
+        case "2.12"       => SVer2_12
       }
     }
   }
   case object SVer2_10 extends SVer {
-    def requireJava8 = false
+    override val requireJava8 = false
   }
   case object SVer2_11 extends SVer {
-    def requireJava8 = false
-  }
-  case object SVer2_12M1 extends SVer {
-    def requireJava8 = true
-  }
-  case object SVer2_12M2 extends SVer {
-    def requireJava8 = true
-  }
-  case object SVer2_12M3 extends SVer {
-    def requireJava8 = true
-  }
-  case object SVer2_12M4 extends SVer {
-    def requireJava8 = true
+    override val supportsNewBackend = true
+    override val requireJava8 = false
   }
   case object SVer2_12 extends SVer {
-    def requireJava8 = true
+    override val newOptimize = true
   }
 }
-