Add Save/Modified display in modeline

src/main/java/app/Main.java

@@ -8,7 +8,7 @@ import javafx.scene.Parent;
 import javafx.scene.Scene;
 import javafx.scene.image.Image;
 import javafx.stage.Stage;
-
+import app.events.FileSaveStateChangedEvent;
 import app.events.LanguageChangedEvent;
 import app.model.Model;
 
@@ -59,6 +59,7 @@ public class Main extends Application {
   private void setupDefaults() {
     MainController mainController = fxmlLoader.getController();
     mainController.getEventBus().post(new LanguageChangedEvent("Java"));
+    mainController.getEventBus().post(new FileSaveStateChangedEvent(true));
   }
 
   /**

src/main/java/app/controllers/EditorController.java

@@ -3,7 +3,6 @@ package app.controllers;
 import java.net.URL;
 import java.util.Collection;
 import java.util.ResourceBundle;
-import java.util.concurrent.CompletableFuture;
 
 import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
@@ -16,6 +15,7 @@ import org.fxmisc.richtext.model.TwoDimensional.Position;
 
 import app.events.EditorChangedEvent;
 import app.events.LanguageChangedEvent;
+import app.events.FileSaveStateChangedEvent;
 import app.model.Model;
 import app.service.LanguageOperations;
 import javafx.fxml.FXML;
@@ -71,6 +71,10 @@ public class EditorController implements Initializable, Controller {
     Position pos = this.editor.offsetToPosition(offset, Bias.Forward);
     this.eventBus.post(new EditorChangedEvent(pos.getMajor() + 1, pos.getMinor()));
 
+
+    if (Model.getFileIsSaved())
+      this.eventBus.post(new FileSaveStateChangedEvent(false));
+
     this.refreshHighlighting();
   }
 

src/main/java/app/controllers/ModelineController.java

@@ -8,13 +8,16 @@ import com.google.common.eventbus.Subscribe;
 
 import app.events.EditorChangedEvent;
 import app.events.LanguageChangedEvent;
-import app.model.Model;
+import app.events.FileSaveStateChangedEvent;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 import javafx.scene.control.Label;
 
 public class ModelineController implements Initializable, Controller {
   
+  @FXML
+  private Label saveState;
+
   @FXML
   private Label columnrow;
 
@@ -53,6 +56,15 @@ public class ModelineController implements Initializable, Controller {
     this.setColumnRow(event.getColumn(), event.getLineNumber());
   }
 
+  /**
+   * Updates the saveState label whenever the file either is saved or modified
+   * @param event
+   */
+  @Subscribe
+  private void handle(FileSaveStateChangedEvent event) {
+    this.saveState.setText(event.getIsSaved() ? "Saved!" : "Modified");
+  }
+
   /**
    * Updates the modeline to display a new language
    * whenever it is changed.

src/main/java/app/events/FileSaveStateChangedEvent.java

@@ -0,0 +1,18 @@
+package app.events;
+
+import app.model.Model;
+
+public class FileSaveStateChangedEvent {
+
+  private boolean isSaved;
+
+  public FileSaveStateChangedEvent(boolean isSaved) {
+    this.isSaved = isSaved;
+    Model.setFileIsSaved(isSaved);
+  }
+
+  public boolean getIsSaved() {
+    return this.isSaved;
+  }
+  
+}

src/main/java/app/model/Model.java

@@ -9,6 +9,7 @@ import javafx.scene.Scene;
  * by multiple pieces in the application, including the primary scene.
  */
 public class Model {
+  private static boolean fileIsSaved;
   private static String activeFilePath;
   private static String currentProjectPath;
   private static ProgrammingLanguage currentProgrammingLanguage;
@@ -30,6 +31,10 @@ public class Model {
     return scene;
   }
 
+  public static boolean getFileIsSaved() {
+    return fileIsSaved;
+  }
+
   public static void setLanguage(ProgrammingLanguage language) {
     Model.currentProgrammingLanguage = language;
   }
@@ -37,4 +42,9 @@ public class Model {
   public static void setScene(Scene scene) {
     Model.scene = scene;
   }
-}
+
+  public static void setFileIsSaved(boolean fileIsSaved) {
+    Model.fileIsSaved = fileIsSaved;
+  }
+
+}