Fix colors handling (#636)

examples/colors.ipynb

@@ -0,0 +1,77 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "\u001b[36mres0\u001b[39m: \u001b[32mInt\u001b[39m = \u001b[32m2\u001b[39m"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "interp.colors() = ammonite.util.Colors.BlackWhite"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "res2: Int = 3"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Scala (sources)",
+   "language": "scala",
+   "name": "scala-debug"
+  },
+  "language_info": {
+   "codemirror_mode": "text/x-scala",
+   "file_extension": ".sc",
+   "mimetype": "text/x-scala",
+   "name": "scala",
+   "nbconvert_exporter": "script",
+   "version": "2.12.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}

modules/scala/scala-interpreter/src/main/scala/almond/amm/AmmInterpreter.scala

@@ -106,7 +106,7 @@ object AmmInterpreter {
           printer = execute0.printer,
           storage = storage,
           wd = ammonite.ops.pwd,
-          colors = Ref(Colors.Default),
+          colors = replApi.colors,
           verboseOutput = true, // ???
           getFrame = () => frames0().head,
           createFrame = () => {

modules/scala/scala-interpreter/src/main/scala/almond/internals/UpdatableFuture.scala

@@ -11,10 +11,11 @@ object UpdatableFuture {
     replApi: ReplAPI,
     jupyterApi: JupyterApi,
     ec: ExecutionContext
-  ): Unit =
-    replApi.pprinter() = {
-      import jupyterApi.updatableResults._
-      val p = replApi.pprinter()
+  ): Unit = {
+    import jupyterApi.updatableResults._
+    val previous = replApi.pprinter.live()
+    replApi.pprinter.bind {
+      val p = previous()
       p.copy(
         additionalHandlers = p.additionalHandlers.orElse {
           case f: Future[_] =>
@@ -36,5 +37,6 @@ object UpdatableFuture {
         }
       )
     }
+  }
 
 }