Added json string interpolation

src/main/scala/argonaut/Argonaut.scala

@@ -16,6 +16,7 @@ EncodeJsons with
 HCursors with
 Jsons with
 JsonIdentitys with
+JsonInterpolator with
 JsonObjects with
 PrettyParamss with
 StringWraps

src/main/scala/argonaut/JsonInterpolator.scala

@@ -0,0 +1,22 @@
+package argonaut
+
+import scalaz.\/
+
+trait JsonInterpolator {
+
+  implicit class JsonHelper(sc: StringContext) {
+    def json(expressions: Any*): String \/ Json = {
+      val stringsItr = sc.parts.iterator
+      val expressionsItr = expressions.iterator
+
+      // Combine string parts, starting with fencepost
+      var buffer = new StringBuffer(stringsItr.next)
+      while (stringsItr.hasNext) {
+        buffer.append(expressionsItr.next)
+        buffer.append(stringsItr.next)
+      }
+      Parse.parse(buffer.toString)
+    }
+  }
+
+}

src/test/scala/argonaut/JsonInterpolatorSpecification.scala

@@ -0,0 +1,38 @@
+package argonaut
+
+import argonaut._, Argonaut._
+import scalaz._, Scalaz._
+import org.specs2._
+import org.specs2.specification._
+
+object JsonInterpolatorSpecification extends Specification {
+  val constructedJson =
+    Json(
+      "name" := "fred",
+      "age" := 23,
+      "wallet" := List(
+        Json("value" := 100),
+        Json("value" := 10),
+        Json("value" := 50)
+      )
+    )
+
+  val age = 23
+  val interpolatedJson =
+    json"""
+          {
+              "name": "fred",
+              "age": $age,
+              "wallet": [
+                  { "value": 100 },
+                  { "value": 10  },
+                  { "value": 50  }
+              ]
+          }
+        """.getOrElse(throw new Exception())
+
+  def is = s2"""
+    Constructed Json matches interpolated Json
+    ${constructedJson must_== interpolatedJson}
+  """
+}