From fc7aedf1b472b2cde492959d52a508bbb68cf153 Mon Sep 17 00:00:00 2001
From: Tom Patterer <t.patterer@gmail.com>
Date: Mon, 7 Nov 2022 14:22:02 +0100
Subject: [PATCH] Test with upickle

---
 build.sbt                                     |  3 ++-
 .../scoverage/samples/CustomPicklers.scala    | 25 +++++++++++++++++++
 .../org/scoverage/samples/UpickleStuff.scala  | 16 ++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 src/main/scala/org/scoverage/samples/CustomPicklers.scala
 create mode 100644 src/main/scala/org/scoverage/samples/UpickleStuff.scala

diff --git a/build.sbt b/build.sbt
index 33b311e..505d5e8 100644
--- a/build.sbt
+++ b/build.sbt
@@ -16,7 +16,8 @@ libraryDependencies ++= Seq(
   "commons-io"             %  "commons-io"    % "2.11.0",
   "com.typesafe.akka"      %% "akka-actor"    % "2.6.20",
   "com.typesafe.akka"      %% "akka-testkit"  % "2.6.20" % "test",
-  "org.scalatest"          %% "scalatest"     % "3.2.14" % "test"
+  "org.scalatest"          %% "scalatest"     % "3.2.14" % "test",
+  "com.lihaoyi"            %% "upickle"       % "2.0.0"
 )
 
 import org.scoverage.coveralls.Imports.CoverallsKeys._
diff --git a/src/main/scala/org/scoverage/samples/CustomPicklers.scala b/src/main/scala/org/scoverage/samples/CustomPicklers.scala
new file mode 100644
index 0000000..00dae2e
--- /dev/null
+++ b/src/main/scala/org/scoverage/samples/CustomPicklers.scala
@@ -0,0 +1,25 @@
+package org.scoverage.samples
+
+import upickle._
+
+/**
+  * Json boilerplate.
+  * - Parse null and missing objects into scala Options
+  */
+object CustomPicklers {
+
+  object OptionPickler extends upickle.AttributeTagged {
+    override implicit def OptionWriter[T: Writer]: Writer[Option[T]] =
+      implicitly[Writer[T]].comap[Option[T]] {
+        case None    => null.asInstanceOf[T]
+        case Some(x) => x
+      }
+
+    override implicit def OptionReader[T: Reader]: Reader[Option[T]] = {
+      new Reader.Delegate[Any, Option[T]](implicitly[Reader[T]].map(Some(_))) {
+        override def visitNull(index: Int) = None
+      }
+    }
+  }
+
+}
diff --git a/src/main/scala/org/scoverage/samples/UpickleStuff.scala b/src/main/scala/org/scoverage/samples/UpickleStuff.scala
new file mode 100644
index 0000000..c759fa5
--- /dev/null
+++ b/src/main/scala/org/scoverage/samples/UpickleStuff.scala
@@ -0,0 +1,16 @@
+package org.scoverage.samples
+
+import org.scoverage.samples.CustomPicklers.OptionPickler.{
+  ReadWriter => RW,
+  macroRW
+}
+
+object UpickleStuff {
+  case class Person(
+      name: String
+  )
+
+  object Person {
+    implicit val rw: RW[Person] = macroRW
+  }
+}