From a57376f40b539260f1d13d3278f10e16a4a2fbe1 Mon Sep 17 00:00:00 2001
From: Li Haoyi <haoyi@dropbox.com>
Date: Wed, 24 Sep 2014 20:19:19 -0700
Subject: wip

---
 src/main/scala/workbench/Plugin.scala | 26 +++++++++++++++++++++++++-
 src/main/scala/workbench/Server.scala |  4 +++-
 2 files changed, 28 insertions(+), 2 deletions(-)

(limited to 'src/main')

diff --git a/src/main/scala/workbench/Plugin.scala b/src/main/scala/workbench/Plugin.scala
index 8e122fe..85b8f39 100644
--- a/src/main/scala/workbench/Plugin.scala
+++ b/src/main/scala/workbench/Plugin.scala
@@ -7,7 +7,8 @@ import scala.concurrent.ExecutionContext.Implicits.global
 object Plugin extends sbt.Plugin {
 
   val refreshBrowsers = taskKey[Unit]("Sends a message to all connected web pages asking them to refresh the page")
-  val updateBrowsers = taskKey[Unit]("partially resets some of the stuff in the browser")
+  val updateBrowsers = taskKey[Unit]("Partially resets some of the stuff in the browser")
+  val spliceBrowsers = taskKey[Unit]("Attempts to do a live update of the code running in the browser while maintaining state")
   val localUrl = settingKey[(String, Int)]("localUrl")
   private[this] val server = settingKey[Server]("local websocket server")
 
@@ -65,6 +66,29 @@ object Plugin extends sbt.Plugin {
         }
       }
     },
+    spliceBrowsers := {
+      val changed = updatedJS.value
+      // There is no point in clearing the browser if no js files have changed.
+      if (changed.length > 0) {
+        for{
+          path <- changed
+          if !path.endsWith(".js.js")
+        }{
+
+          streams.value.log.info("workbench: Splicing " + path)
+          val prefix = "http://localhost:12345/"
+          var s = IO.read(new sbt.File(path.drop(prefix.length)))
+
+          s = s.replace("\nvar ScalaJS = ", "\nvar ScalaJS = ScalaJS || ")
+          s = s.replaceAll("\n(ScalaJS\\.c\\.[a-zA-Z_$0-9]+\\.prototype) = ", "/*X*/\n$1 = $1 || ")
+          for(char <- Seq("d", "c", "h", "i", "n", "m")){
+            s = s.replaceAll("\n(ScalaJS\\." + char + "\\.[a-zA-Z_$0-9]+) = ", "\n$1 = $1 || ")
+          }
+          IO.write(new sbt.File(path.drop(prefix.length) + ".js"), s.getBytes)
+          server.value.Wire[Api].run(path + ".js", None).call()
+        }
+      }
+    },
     server := new Server(localUrl.value._1, localUrl.value._2, bootSnippet.value),
     (onUnload in Global) := { (onUnload in Global).value.compose{ state =>
       server.value.kill()
diff --git a/src/main/scala/workbench/Server.scala b/src/main/scala/workbench/Server.scala
index 4d37073..8d05037 100644
--- a/src/main/scala/workbench/Server.scala
+++ b/src/main/scala/workbench/Server.scala
@@ -3,11 +3,12 @@ package com.lihaoyi.workbench
 import akka.actor.{ActorRef, Actor, ActorSystem}
 import com.typesafe.config.ConfigFactory
 import sbt.IO
+import spray.httpx.encoding.Gzip
 import spray.routing.SimpleRoutingApp
 import akka.actor.ActorDSL._
 
 import upickle.{Reader, Writer, Js}
-import spray.http.{AllOrigins, HttpResponse}
+import spray.http.{HttpEntity, AllOrigins, HttpResponse}
 import spray.http.HttpHeaders.`Access-Control-Allow-Origin`
 import concurrent.duration._
 import scala.concurrent.Future
@@ -94,6 +95,7 @@ class Server(url: String, port: Int, bootSnippet: String) extends SimpleRoutingA
         }
       } ~
       getFromDirectory(".")
+
     } ~
     post {
       path("notifications") { ctx =>
-- 
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