From 55542796c030974f0e5fb32fcb24bf99f468532d Mon Sep 17 00:00:00 2001
From: Jakob Odersky <jakob@odersky.com>
Date: Thu, 29 Mar 2018 12:20:31 -0700
Subject: Add option flag to parameters

---
 core/shared/src/main/scala/interface.scala | 3 +++
 core/shared/src/main/scala/magnolia.scala  | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/core/shared/src/main/scala/interface.scala b/core/shared/src/main/scala/interface.scala
index af4fb51..ba65fb6 100644
--- a/core/shared/src/main/scala/interface.scala
+++ b/core/shared/src/main/scala/interface.scala
@@ -63,6 +63,9 @@ trait Param[Typeclass[_], Type] extends Serializable {
   /** the name of the parameter */
   def label: String
 
+  /** flag indicating a parameter of type scala.Option */
+  def option: Boolean
+
   /** flag indicating a repeated (aka. vararg) parameter
     *
     * For example, for a case class,
diff --git a/core/shared/src/main/scala/magnolia.scala b/core/shared/src/main/scala/magnolia.scala
index c2dbf0a..2a15573 100644
--- a/core/shared/src/main/scala/magnolia.scala
+++ b/core/shared/src/main/scala/magnolia.scala
@@ -296,6 +296,7 @@ object Magnolia {
             q"""$paramsVal($idx) = $magnoliaPkg.Magnolia.param[$typeConstructor, $genericType,
                 $paramType](
             ${param.name.decodedName.toString},
+            ${param.returnType.typeConstructor =:= typeOf[Option[_]].typeConstructor},
             $repeated,
             $ref,
             $defaultVal,
@@ -439,6 +440,7 @@ object Magnolia {
     *  This method is intended to be called only from code generated by the Magnolia macro, and
     *  should not be called directly from users' code. */
   def param[Tc[_], T, P](name: String,
+                         isOption: Boolean,
                          isRepeated: Boolean,
                          typeclassParam: => Tc[P],
                          defaultVal: => Option[P],
@@ -447,6 +449,7 @@ object Magnolia {
                         ): Param[Tc, T] = new Param[Tc, T] {
     type PType = P
     def label: String = name
+    def option: Boolean = isOption
     def repeated: Boolean = isRepeated
     def default: Option[PType] = defaultVal
     def typeclass: Tc[PType] = typeclassParam
-- 
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