1 files changed, 23 insertions, 0 deletions
diff --git a/contrib/bloop/src/mill.contrib.bloop/CirceCompat.scala b/contrib/bloop/src/mill.contrib.bloop/CirceCompat.scala
new file mode 100644
index 00000000..bfd88e07
--- /dev/null
+++ b/contrib/bloop/src/mill.contrib.bloop/CirceCompat.scala
@@ -0,0 +1,23 @@
+package mill.contrib.bloop
+
+import io.circe.{Decoder, Encoder, Json}
+import upickle.core.Visitor
+import upickle.default
+
+trait CirceCompat {
+
+  // Converts from a Circe encoder to a uPickle one
+  implicit def circeWriter[T: Encoder]: default.Writer[T] =
+    new default.Writer[T] {
+      override def write0[V](out: Visitor[_, V], v: T) =
+        ujson.circe.CirceJson.transform(Encoder[T].apply(v), out)
+    }
+
+  // Converts from a Circe decoder to a uPickle one
+  implicit def circeReader[T: Decoder]: default.Reader[T] =
+    new default.Reader.Delegate[Json, T](
+      ujson.circe.CirceJson.map(Decoder[T].decodeJson).map(_.right.get))
+
+}
+
+object CirceCompat extends CirceCompat