Merge pull request #13 from ThoughtWorksInc/thenable-and-future

Add Bindable type class for Future and Thenable

Author: Atry

js/js.sbt

@@ -1,5 +1,7 @@
 enablePlugins(Example)
 
+libraryDependencies += "com.thoughtworks.binding" %%% "jspromisebinding" % "11.7.0+144-dfef7165"
+
 libraryDependencies += "com.thoughtworks.binding" %%% "dom" % "11.7.0" % Test
 
 addCompilerPlugin("org.spire-math" %% "kind-projector" % "0.9.10")

shared/build.sbt

@@ -2,8 +2,28 @@ libraryDependencies += "org.scalatest" %%% "scalatest" % "3.0.7" % Test
 
 libraryDependencies += "com.thoughtworks.binding" %%% "binding" % "11.7.0"
 
+libraryDependencies += "com.thoughtworks.binding" %%% "futurebinding" % "11.7.0"
+
 libraryDependencies += "com.github.mpilquist" %%% "simulacrum" % "0.15.0"
 
 libraryDependencies += "com.thoughtworks.enableIf" %% "enableif" % "1.1.6"
 
-addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.1" cross CrossVersion.full)
+// Enable macro annotation by scalac flags for Scala 2.13
+scalacOptions ++= {
+  import Ordering.Implicits._
+  if (VersionNumber(scalaVersion.value).numbers >= Seq(2L, 13L)) {
+    Some("-Ymacro-annotations")
+  } else {
+    None
+  }
+}
+
+// Enable macro annotation by compiler plugins for Scala 2.12
+libraryDependencies ++= {
+  import Ordering.Implicits._
+  if (VersionNumber(scalaVersion.value).numbers >= Seq(2L, 13L)) {
+    None
+  } else {
+    Some(compilerPlugin("org.scalamacros" % "paradise" % "2.1.1" cross CrossVersion.full))
+  }
+}

shared/src/main/scala/com/thoughtworks/binding/bindable/package.scala

@@ -1,6 +1,8 @@
 package com.thoughtworks.binding
 
+import com.thoughtworks.binding._
 import com.thoughtworks.binding.Binding._
+import com.thoughtworks.enableIf
 import simulacrum._
 import scala.language.implicitConversions
 
@@ -47,6 +49,9 @@ package bindable {
   import Jvm._
   import Js._
 
+  import scala.concurrent.{ExecutionContext, Future}
+  import scala.util.Try
+
   private[bindable] trait LowPriorityBindable0 {
 
     implicit def constantBindable[Value0]: Bindable.Aux[Value0, Value0] = new Bindable[Value0] {
@@ -69,6 +74,21 @@ package bindable {
       def toBinding(from: Binding[Value0]): Binding[Value] = from
     }
 
+    implicit def futureBindable[Value0](
+        implicit executionContext: ExecutionContext): Bindable.Aux[Future[Value0], Option[Try[Value0]]] =
+      new Bindable[Future[Value0]] {
+        type Value = Option[Try[Value0]]
+        def toBinding(from: Future[Value0]): Binding[Value] = FutureBinding(from)
+      }
+
+    @enableIf(c => c.compilerSettings.exists(_.matches("""^-Xplugin:.*scalajs-compiler_[0-9\.\-]*\.jar$""")))
+    implicit def thenableBindable[Value0]
+      : Bindable.Aux[scala.scalajs.js.Thenable[Value0], Option[Either[Any, Value0]]] =
+      new Bindable[scala.scalajs.js.Thenable[Value0]] {
+        type Value = Option[Either[Any, Value0]]
+        def toBinding(from: scala.scalajs.js.Thenable[Value0]): Binding[Value] = JsPromiseBinding(from)
+      }
+
   }
 
   /** A dependent type class that witnesses a type that can be converted to a `Binding[Value]`.