instantaneous asset reload without nginx

app/AppLoader.scala

@@ -46,6 +46,10 @@ final class LilaComponents(ctx: ApplicationLoader.Context)
   implicit def system = actorSystem
   implicit def ws     = wsClient
 
+  // dev assets
+  implicit def mimeTypes = fileMimeTypes
+  lazy val devAssetsController = wire[ExternalAssets]
+
   lazy val boot: lila.app.EnvBoot = wire[lila.app.EnvBoot]
   lazy val env: lila.app.Env      = boot.env
 

app/controllers/Main.scala

@@ -15,7 +15,7 @@ import views._
 final class Main(
     env: Env,
     prismicC: Prismic,
-    assetsC: Assets
+    assetsC: ExternalAssets
 ) extends LilaController(env) {
 
   private lazy val blindForm = Form(
@@ -188,5 +188,5 @@ Disallow: /games/export
     }.fuccess
   }
 
-  def devAsset(@silent v: String, file: String) = assetsC.at(file)
+  def devAsset(@silent v: String, path: String, file: String) = assetsC.at(path, file)
 }

build.sbt

@@ -23,8 +23,10 @@ PlayKeys.playDefaultPort := 9663
 PlayKeys.externalizeResources := false
 // shorter prod classpath
 scriptClasspath := Seq("*")
+// give a fake assets dir to make sure they're not packaged
+resourceDirectory in Assets := baseDirectory.value / "public-nothanks"
 // don't make an assets jar
-/* resourceDirectory in Assets := (sourceDirectory in Compile).value / "assets" */
+PlayKeys.generateAssetsJar := false
 // use akka-http for dev
 PlayKeys.devSettings += "play.server.provider" -> "play.core.server.AkkaHttpServerProvider"
 

conf/routes

@@ -602,8 +602,8 @@ POST  /jsmon/:event                    controllers.Main.jsmon(event: String)
 
 GET   /swag                            controllers.Main.movedPermanently(to: String = "https://shop.spreadshirt.com/lichess-org")
 
-GET   /assets/_$v<\w{6}>/*file         controllers.Main.devAsset(v, file)
-GET   /assets/*file                    controllers.Assets.at(file)
+GET   /assets/_$v<\w{6}>/*file         controllers.Main.devAsset(v, path="public", file)
+GET   /assets/*file                    controllers.ExternalAssets.at(path="public", file)
 
 GET   /robots.txt                      controllers.Main.robots