Add consoleOut and consoleErr in JupyterApi

modules/scala/jupyter-api/src/main/scala/almond/api/JupyterApi.scala

@@ -3,6 +3,7 @@ package almond.api
 import almond.interpreter.api.{CommHandler, DisplayData, OutputHandler}
 import jupyter.{Displayer, Displayers}
 
+import java.io.PrintStream
 import java.util.concurrent.atomic.AtomicInteger
 import java.util.{Locale, UUID}
 
@@ -55,6 +56,9 @@ abstract class JupyterApi { api =>
 
   def addExecuteHook(hook: JupyterApi.ExecuteHook): Boolean
   def removeExecuteHook(hook: JupyterApi.ExecuteHook): Boolean
+
+  def consoleOut: PrintStream
+  def consoleErr: PrintStream
 }
 
 object JupyterApi {

modules/scala/scala-interpreter/src/main/scala/almond/Execute.scala

@@ -108,7 +108,9 @@ final class Execute(
     resultStream,
     s => currentPublishOpt0.fold(Console.err.println(s))(_.stderr(s)),
     s => currentPublishOpt0.fold(Console.err.println(s))(_.stderr(s)),
-    s => currentPublishOpt0.fold(println(s))(_.stdout(s))
+    // to stdout in notebooks, not to get a red background,
+    // but stderr in the console, not to pollute stdout
+    s => currentPublishOpt0.fold(Console.err.println(s))(_.stdout(s))
   )
 
   def history: History =

modules/scala/scala-interpreter/src/main/scala/almond/JupyterApiImpl.scala

@@ -1,6 +1,6 @@
 package almond
 
-import java.io.ByteArrayOutputStream
+import java.io.{ByteArrayOutputStream, PrintStream}
 import java.nio.charset.StandardCharsets
 
 import almond.api.{FullJupyterApi, JupyterApi}
@@ -21,7 +21,9 @@ final class JupyterApiImpl(
   replApi: ReplApiImpl,
   silent0: Ref[Boolean],
   protected val allowVariableInspector: Option[Boolean],
-  val kernelClassLoader: ClassLoader
+  val kernelClassLoader: ClassLoader,
+  val consoleOut: PrintStream,
+  val consoleErr: PrintStream
 ) extends FullJupyterApi with VariableInspectorApiImpl {
 
   protected def variableInspectorImplPPrinter() = replApi.pprinter()

modules/scala/scala-interpreter/src/main/scala/almond/ScalaInterpreter.scala

@@ -94,7 +94,9 @@ final class ScalaInterpreter(
       replApi,
       silent0,
       params.allowVariableInspector,
-      kernelClassLoader = Thread.currentThread().getContextClassLoader
+      kernelClassLoader = Thread.currentThread().getContextClassLoader,
+      consoleOut = System.out,
+      consoleErr = System.err
     )
 
   if (params.toreeMagics) {