Build system indicators, Language keys and filtering SLF4J warnings

app/src/processing/app/gradle/GradleJob.kt

@@ -49,6 +49,7 @@ class GradleJob{
         scope.launch {
             try {
                 state.value = State.BUILDING
+                service?.editor?.statusMessage("Building sketch", EditorStatus.NOTICE)
 
                 GradleConnector.newConnector()
                     .forProjectDirectory(folder)

app/src/processing/app/gradle/GradleService.kt

@@ -64,6 +64,7 @@ class GradleService(
 
     private fun startAction(vararg tasks: String) {
         if(!active.value) return
+        editor?.let { println(Language.text("gradle.using_gradle"))  }
 
         val job = GradleJob()
         job.service = this

app/src/processing/app/ui/EditorConsole.java

@@ -257,6 +257,9 @@ public class EditorConsole extends JScrollPane {
       } else if (what.contains("__MOVE__")) {
         // Don't display the "Move" message that is used to position the sketch window
         return true;
+      }else if (what.startsWith("SLF4J: ")) {
+        // Don't display the SLF4J messages
+        return true;
       }
 
     } else {  // !err

build/shared/lib/languages/PDE.properties

@@ -232,6 +232,7 @@ preferences.launch_programs_in = Launch programs in
 preferences.launch_programs_in.mode = mode
 preferences.file = More preferences can be edited directly in the file:
 preferences.file.hint = (Edit only when Processing is not running.)
+preferences.use_modern_build_system = Use modern build system (see Processing GitHub Wiki more details)
 
 # Sketchbook Location (Frame)
 sketchbook_location = Select new sketchbook folder
@@ -321,6 +322,8 @@ debugger.type = Type
 
 # Gradle
 gradle.instructions = About this file: \nProcessing creates this file when you run your sketch. \nIt configures the tools needed to build and export your code. \nLearn more: [Gradle Primer link]\n \nTo customize this file: \n1. Delete the line above that begins with '@processing-auto-generated'. \nThis will prevent Processing from overwriting this file in the future. \n2. Make your desired changes.
+gradle.using_gradle = Building sketch using the new build system. (See settings to switch to the legacy build system.)
+gradle.using_eclipse = Building sketch using the legacy build system. (See settings to switch to the new build system.)
 
 # ---------------------------------------
 # Toolbars

java/src/processing/mode/java/Compiler.java

@@ -52,6 +52,7 @@ public class Compiler {
    * @throws SketchException Only if there's a problem. Only then.
    */
   static public boolean compile(JavaBuild build) throws SketchException {
+    System.out.println(Language.text("gradle.using_eclipse"));
 
     // This will be filled in if anyone gets angry
     SketchException exception = null;