client/src/main/java/envoy/client/data/LocalDB.java

@@ -212,6 +212,13 @@ public final class LocalDB implements EventListener {
 	@Event
 	private void onNewAuthToken(NewAuthToken evt) { authToken = evt.get(); }
 
+	/**
+	 * Deletes the file that stores the "remember me" feature.
+	 *
+	 * @since Envoy Client v0.2-beta
+	 */
+	public void deleteLoginFile() { lastLoginFile.delete(); }
+
 	/**
 	 * @return a {@code Map<String, User>} of all users stored locally with their
 	 *         user names as keys

client/src/main/java/envoy/client/data/Settings.java

@@ -92,6 +92,8 @@ public final class Settings implements EventListener {
 				new SettingsItem<>(new File(System.getProperty("user.home") + "/Downloads/"), "Download location",
 						"The location where files will be saved to"));
 		items.putIfAbsent("autoSaveDownloads", new SettingsItem<>(false, "Save without asking?", "Should downloads be saved without asking?"));
+		items.putIfAbsent("askForConfirmation",
+				new SettingsItem<>(true, "Ask for confirmation", "Will ask for confirmation before doing certain things"));
 	}
 
 	/**
@@ -182,6 +184,25 @@ public final class Settings implements EventListener {
 	 */
 	public void setHideOnClose(boolean hideOnClose) { ((SettingsItem<Boolean>) items.get("hideOnClose")).set(hideOnClose); }
 
+	/**
+	 * @return whether a confirmation dialog should be displayed before certain
+	 *         actions
+	 * @since Envoy Client v0.2-alpha
+	 */
+	public Boolean isAskForConfirmation() { return (Boolean) items.get("askForConfirmation").get(); }
+
+	/**
+	 * Changes the behavior of calling certain functionality by displaying a
+	 * confirmation dialog before executing it.
+	 *
+	 * @param askForConfirmation whether confirmation dialogs should be displayed
+	 *                           before certain actions
+	 * @since Envoy Client v0.2-alpha
+	 */
+	public void setAskForConfirmation(boolean askForConfirmation) {
+		((SettingsItem<Boolean>) items.get("askForConfirmation")).set(askForConfirmation);
+	}
+
 	/**
 	 * @return the items
 	 */

client/src/main/java/envoy/client/data/commands/SystemCommandBuilder.java

@@ -1,7 +1,6 @@
 package envoy.client.data.commands;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.*;
 import java.util.function.Consumer;
 
 /**
@@ -22,6 +21,22 @@ public final class SystemCommandBuilder {
 	private String					description;
 	private int						relevance;
 
+	private final SystemCommandMap commandsMap;
+
+	/**
+	 * Creates a new {@code SystemCommandsBuilder} without underlying
+	 * {@link SystemCommandMap}.
+	 *
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommandBuilder() { this(null); }
+
+	/**
+	 * @param commandsMap the map to use when calling build (optional)
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommandBuilder(SystemCommandMap commandsMap) { this.commandsMap = commandsMap; }
+
 	/**
 	 * @param numberOfArguments the numberOfArguments to set
 	 * @return this {@code SystemCommandBuilder}
@@ -125,6 +140,7 @@ public final class SystemCommandBuilder {
 
 	/**
 	 * Builds a {@code SystemCommand} based upon the previously entered data.<br>
+	 * Automatically adds the built object to the given map.
 	 * At the end, this {@code SystemCommandBuilder} <b>can</b> be reset but must
 	 * not be.
 	 *
@@ -141,4 +157,78 @@ public final class SystemCommandBuilder {
 		if (reset) reset();
 		return sc;
 	}
+
+	/**
+	 * Builds a {@code SystemCommand} based upon the previously entered data.
+	 * Automatically adds the built object to the given map.
+	 *
+	 * @param command the command under which to store the SystemCommand in the
+	 *                {@link SystemCommandMap}
+	 * @return the built {@code SystemCommand}
+	 * @throws NullPointerException if no map has been assigned to this builder
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommand build(String command) { return build(command, true); }
+
+	/**
+	 * Builds a {@code SystemCommand} based upon the previously entered data.<br>
+	 * Automatically adds the built object to the given map.
+	 * {@code SystemCommand#numberOfArguments} will be set to 0, regardless of the
+	 * previous value.<br>
+	 * At the end, this {@code SystemCommandBuilder} will be reset.
+	 *
+	 * @param command the command under which to store the SystemCommand in the
+	 *                {@link SystemCommandMap}
+	 * @return the built {@code SystemCommand}
+	 * @throws NullPointerException if no map has been assigned to this builder
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommand buildNoArg(String command) {
+		numberOfArguments = 0;
+		return build(command, true);
+	}
+
+	/**
+	 * Builds a {@code SystemCommand} based upon the previously entered data.<br>
+	 * Automatically adds the built object to the given map.
+	 * {@code SystemCommand#numberOfArguments} will be set to use the rest of the
+	 * string as argument, regardless of the previous value.<br>
+	 * At the end, this {@code SystemCommandBuilder} will be reset.
+	 *
+	 * @param command the command under which to store the SystemCommand in the
+	 *                {@link SystemCommandMap}
+	 * @return the built {@code SystemCommand}
+	 * @throws NullPointerException if no map has been assigned to this builder
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommand buildRemainingArg(String command) {
+		numberOfArguments = -1;
+		return build(command, true);
+	}
+
+	/**
+	 * Builds a {@code SystemCommand} based upon the previously entered data.<br>
+	 * Automatically adds the built object to the given map.
+	 * At the end, this {@code SystemCommandBuilder} <b>can</b> be reset but must
+	 * not be.
+	 *
+	 * @param command the command under which to store the SystemCommand in the
+	 *                {@link SystemCommandMap}
+	 * @param reset   whether this {@code SystemCommandBuilder} should be reset
+	 *                afterwards.<br>
+	 *                This can be useful if another command wants to execute
+	 *                something
+	 *                similar
+	 * @return the built {@code SystemCommand}
+	 * @throws NullPointerException if no map has been assigned to this builder
+	 * @since Envoy Client v0.2-beta
+	 */
+	public SystemCommand build(String command, boolean reset) {
+		final var sc = new SystemCommand(action, numberOfArguments, defaults, description);
+		sc.setRelevance(relevance);
+		if (commandsMap != null) commandsMap.add(command, sc);
+		else throw new NullPointerException("No map in SystemCommandsBuilder present");
+		if (reset) reset();
+		return sc;
+	}
 }

client/src/main/java/envoy/client/data/commands/SystemCommandMap.java

@@ -12,19 +12,19 @@ import envoy.util.EnvoyLog;
  * This class stores all {@link SystemCommand}s used.
  * <p>
  * Project: <strong>envoy-client</strong><br>
- * File: <strong>SystemCommandsMap.java</strong><br>
+ * File: <strong>SystemCommandMap.java</strong><br>
  * Created: <strong>17.07.2020</strong><br>
  *
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public final class SystemCommandsMap {
+public final class SystemCommandMap {
 
 	private final Map<String, SystemCommand> systemCommands = new HashMap<>();
 
 	private final Pattern commandPattern = Pattern.compile("^[a-zA-Z0-9_:!\\(\\)\\?\\.\\,\\;\\-]+$");
 
-	private static final Logger logger = EnvoyLog.getLogger(SystemCommandsMap.class);
+	private static final Logger logger = EnvoyLog.getLogger(SystemCommandMap.class);
 
 	/**
 	 * Adds a new command to the map if the command name is valid.
@@ -33,7 +33,7 @@ public final class SystemCommandsMap {
 	 *                      given action
 	 * @param systemCommand the command to add - can be built using
 	 *                      {@link SystemCommandBuilder}
-	 * @see SystemCommandsMap#isValidKey(String)
+	 * @see SystemCommandMap#isValidKey(String)
 	 * @since Envoy Client v0.2-beta
 	 */
 	public void add(String command, SystemCommand systemCommand) {
@@ -48,7 +48,7 @@ public final class SystemCommandsMap {
 	 * map).
 	 * <p>
 	 * Usage example:<br>
-	 * {@code SystemCommandsMap systemCommands = new SystemCommandsMap();}<br>
+	 * {@code SystemCommandMap systemCommands = new SystemCommandMap();}<br>
 	 * {@code Button button = new  Button();}
 	 * {@code systemCommands.add("example", text -> button.setText(text.get(0), 1);}<br>
 	 * {@code ....}<br>
@@ -132,7 +132,7 @@ public final class SystemCommandsMap {
 	 * map).
 	 * <p>
 	 * Usage example:<br>
-	 * {@code SystemCommandsMap systemCommands = new SystemCommandsMap();}<br>
+	 * {@code SystemCommandMap systemCommands = new SystemCommandMap();}<br>
 	 * {@code Button button = new Button();}<br>
 	 * {@code systemCommands.add("example", (words)-> button.setText(words.get(0), 1);}<br>
 	 * {@code ....}<br>

client/src/main/java/envoy/client/helper/AlertHelper.java

@@ -0,0 +1,36 @@
+package envoy.client.helper;
+
+import javafx.scene.control.*;
+
+import envoy.client.data.Settings;
+
+/**
+ * Provides methods that are commonly used for alerts.
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.2-beta
+ */
+public class AlertHelper {
+
+	private AlertHelper() {}
+
+	/**
+	 * Asks for a confirmation dialog if {@link Settings#isAskForConfirmation()}
+	 * returns {@code true}.
+	 * Immediately executes the action if no dialog was requested or the dialog was
+	 * exited with a confirmation.
+	 * Does nothing if the dialog was closed without clicking on OK.
+	 *
+	 * @param alert  the (customized) alert to show. <strong>Should not be shown
+	 *               already</strong>
+	 * @param action the action to perform in case of success
+	 * @since Envoy Client v0.2-beta
+	 */
+	public static void confirmAction(Alert alert, Runnable action) {
+		alert.setHeight(225);
+		alert.setWidth(400);
+		alert.setHeaderText("");
+		if (Settings.getInstance().isAskForConfirmation()) alert.showAndWait().filter(ButtonType.OK::equals).ifPresent(bu -> action.run());
+		else action.run();
+	}
+}

client/src/main/java/envoy/client/helper/ShutdownHelper.java

@@ -0,0 +1,45 @@
+package envoy.client.helper;
+
+import javafx.application.Platform;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
+
+import envoy.client.data.*;
+import envoy.client.event.EnvoyCloseEvent;
+
+import dev.kske.eventbus.EventBus;
+
+/**
+ * Contains methods that have a direct impact on the user.
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Client v0.2-beta
+ */
+public class ShutdownHelper {
+
+	private ShutdownHelper() {}
+
+	/**
+	 * Exits Envoy or minimizes it, depending on the current state of
+	 * {@link Settings#isHideOnClose()}.
+	 *
+	 * @since Envoy Client v0.2-beta
+	 */
+	public static void exit() { exit(Settings.getInstance().isHideOnClose(), true); }
+
+	/**
+	 * Exits the currently open Envoy application or minimizes it.
+	 * Does not necessarily shutdown VM.
+	 *
+	 * @param minimize   whether Envoy should be minimized instead of closed
+	 * @param shutdownVM whether the JVM should shutdown
+	 * @since Envoy Client v0.2-beta
+	 */
+	public static void exit(boolean minimize, boolean shutdownVM) {
+		if (minimize) Context.getInstance().getStage().setIconified(true);
+		else {
+			EventBus.getInstance().dispatch(new EnvoyCloseEvent());
+			if (shutdownVM) System.exit(0);
+		}
+	}
+}

client/src/main/java/envoy/client/helper/package-info.java

@@ -0,0 +1,9 @@
+/**
+ * Provides helper methods that reduce boilerplate code.
+ *
+ * @author Leon Hofmeister
+ * @author Kai S. K. Engelbert
+ * @author Maximilian Käfer
+ * @since Envoy Client v0.2-beta
+ */
+package envoy.client.helper;

client/src/main/java/envoy/client/ui/SceneContext.java

@@ -11,7 +11,8 @@ import javafx.scene.input.*;
 import javafx.stage.Stage;
 
 import envoy.client.data.Settings;
-import envoy.client.event.*;
+import envoy.client.event.ThemeChangeEvent;
+import envoy.client.helper.ShutdownHelper;
 import envoy.util.EnvoyLog;
 
 import dev.kske.eventbus.*;
@@ -108,17 +109,7 @@ public final class SceneContext implements EventListener {
 			stage.setScene(scene);
 
 			// Adding the option to exit Linux-like with "Control" + "Q"
-			scene.getAccelerators()
-				.put(new KeyCodeCombination(KeyCode.Q, KeyCombination.CONTROL_DOWN),
-						() -> {
-							// Presumably no Settings are loaded in the login scene, hence Envoy is closed
-							// directly
-							if (sceneInfo != SceneInfo.LOGIN_SCENE && settings.isHideOnClose()) stage.setIconified(true);
-							else {
-								EventBus.getInstance().dispatch(new EnvoyCloseEvent());
-								System.exit(0);
-							}
-						});
+			scene.getAccelerators().put(new KeyCodeCombination(KeyCode.Q, KeyCombination.CONTROL_DOWN), ShutdownHelper::exit);
 
 			// The LoginScene is the only scene not intended to be resized
 			// As strange as it seems, this is needed as otherwise the LoginScene won't be

client/src/main/java/envoy/client/ui/Startup.java

@@ -11,7 +11,7 @@ import javafx.scene.control.Alert.AlertType;
 import javafx.stage.Stage;
 
 import envoy.client.data.*;
-import envoy.client.event.EnvoyCloseEvent;
+import envoy.client.helper.ShutdownHelper;
 import envoy.client.net.Client;
 import envoy.client.ui.SceneContext.SceneInfo;
 import envoy.client.ui.controller.LoginScene;
@@ -21,10 +21,8 @@ import envoy.event.*;
 import envoy.exception.EnvoyException;
 import envoy.util.EnvoyLog;
 
-import dev.kske.eventbus.EventBus;
-
 /**
- * Handles application startup and shutdown.
+ * Handles application startup.
  * <p>
  * Project: <strong>envoy-client</strong><br>
  * File: <strong>Startup.java</strong><br>
@@ -212,12 +210,7 @@ public final class Startup extends Application {
 		if (StatusTrayIcon.isSupported()) {
 
 			// Configure hide on close
-			stage.setOnCloseRequest(e -> {
-				if (Settings.getInstance().isHideOnClose()) {
-					stage.setIconified(true);
-					e.consume();
-				} else EventBus.getInstance().dispatch(new EnvoyCloseEvent());
-			});
+			stage.setOnCloseRequest(e -> { ShutdownHelper.exit(); if (Settings.getInstance().isHideOnClose()) e.consume(); });
 
 			// Initialize status tray icon
 			final var trayIcon = new StatusTrayIcon(stage);

client/src/main/java/envoy/client/ui/StatusTrayIcon.java

@@ -6,6 +6,7 @@ import java.awt.TrayIcon.MessageType;
 import javafx.application.Platform;
 import javafx.stage.Stage;
 
+import envoy.client.helper.ShutdownHelper;
 import envoy.data.Message;
 
 import dev.kske.eventbus.*;
@@ -56,7 +57,7 @@ public final class StatusTrayIcon implements EventListener {
 		final PopupMenu popup = new PopupMenu();
 
 		final MenuItem exitMenuItem = new MenuItem("Exit");
-		exitMenuItem.addActionListener(evt -> { Platform.exit(); System.exit(0); });
+		exitMenuItem.addActionListener(evt -> ShutdownHelper.exit());
 		popup.add(exitMenuItem);
 
 		trayIcon.setPopupMenu(popup);

client/src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -144,7 +144,7 @@ public final class ChatScene implements EventListener, Restorable {
 	private final WriteProxy		writeProxy				= context.getWriteProxy();
 	private final SceneContext		sceneContext			= context.getSceneContext();
 	private final AudioRecorder		recorder				= new AudioRecorder();
-	private final SystemCommandsMap	messageTextAreaCommands	= new SystemCommandsMap();
+	private final SystemCommandMap	messageTextAreaCommands	= new SystemCommandMap();
 	private final Tooltip			onlyIfOnlineTooltip		= new Tooltip("You need to be online to do this");
 
 	private static Image DEFAULT_ATTACHMENT_VIEW_IMAGE = IconUtil.loadIconThemeSensitive("attachment_present", 20);
@@ -329,14 +329,15 @@ public final class ChatScene implements EventListener, Restorable {
 	 * @since Envoy Client v0.2-beta
 	 */
 	private void initializeSystemCommandsMap() {
-		final var builder = new SystemCommandBuilder();
+		final var builder = new SystemCommandBuilder(messageTextAreaCommands);
+
 		// Do A Barrel roll initialization
 		final var random = new Random();
 		builder.setAction(text -> doABarrelRoll(Integer.parseInt(text.get(0)), Double.parseDouble(text.get(1))))
 			.setDefaults(Integer.toString(random.nextInt(3) + 1), Double.toString(random.nextDouble() * 3 + 1))
 			.setDescription("See for yourself :)")
-			.setNumberOfArguments(2);
-		messageTextAreaCommands.add("DABR", builder.build());
+			.setNumberOfArguments(2)
+			.build("dabr");
 	}
 
 	@Override

client/src/main/java/envoy/client/ui/controller/ContactSearchTab.java

@@ -8,6 +8,7 @@ import javafx.scene.control.*;
 import javafx.scene.control.Alert.AlertType;
 
 import envoy.client.event.*;
+import envoy.client.helper.AlertHelper;
 import envoy.client.ui.listcell.*;
 import envoy.data.User;
 import envoy.event.ElementOperation;
@@ -42,9 +43,10 @@ public class ContactSearchTab implements EventListener {
 	@FXML
 	private ListView<User> userList;
 
-	private Alert alert = new Alert(AlertType.CONFIRMATION);
 	private User currentlySelectedUser;
 
+	private final Alert alert = new Alert(AlertType.CONFIRMATION);
+
 	private static final EventBus	eventBus	= EventBus.getInstance();
 	private static final Logger		logger		= EnvoyLog.getLogger(ChatScene.class);
 
@@ -52,6 +54,7 @@ public class ContactSearchTab implements EventListener {
 	private void initialize() {
 		eventBus.registerListener(this);
 		userList.setCellFactory(new ListCellFactory<>(ContactControl::new));
+		alert.setTitle("Add User?");
 	}
 
 	@Event
@@ -102,17 +105,24 @@ public class ContactSearchTab implements EventListener {
 	private void userListClicked() {
 		final var user = userList.getSelectionModel().getSelectedItem();
 		if (user != null) {
-			currentlySelectedUser	= user;
-			final var event = new ContactOperation(currentlySelectedUser, ElementOperation.ADD);
-			// Sends the event to the server
-			eventBus.dispatch(new SendEvent(event));
-			// Removes the chosen user and updates the UI
-			userList.getItems().remove(currentlySelectedUser);
-			eventBus.dispatch(event);
-			logger.log(Level.INFO, "Added user " + currentlySelectedUser);
+			currentlySelectedUser = user;
+			alert.setContentText("Add user " + currentlySelectedUser.getName() + " to your contacts?");
+			AlertHelper.confirmAction(alert, this::addAsContact);
 		}
 	}
 
+	private void addAsContact() { 
+		
+		// Sends the event to the server
+		final var event = new ContactOperation(currentlySelectedUser, ElementOperation.ADD);
+		eventBus.dispatch(new SendEvent(event));
+		
+		// Removes the chosen user and updates the UI
+		userList.getItems().remove(currentlySelectedUser);
+		eventBus.dispatch(event);
+		logger.log(Level.INFO, "Added user " + currentlySelectedUser);
+	}
+
 	@FXML
 	private void backButtonClicked() { eventBus.dispatch(new BackEvent()); }
 }

client/src/main/java/envoy/client/ui/settings/GeneralSettingsPane.java

@@ -3,7 +3,7 @@ package envoy.client.ui.settings;
 import javafx.scene.control.*;
 
 import envoy.client.data.SettingsItem;
-import envoy.client.event.ThemeChangeEvent;
+import envoy.client.event.*;
 import envoy.data.User.UserStatus;
 
 import dev.kske.eventbus.EventBus;
@@ -28,23 +28,30 @@ public final class GeneralSettingsPane extends SettingsPane {
 		// TODO: Support other value types
 		final var	settingsItems		= settings.getItems();
 		final var	hideOnCloseCheckbox	= new SettingsCheckbox((SettingsItem<Boolean>) settingsItems.get("hideOnClose"));
-		hideOnCloseCheckbox.setTooltip(new Tooltip("If selected, Envoy will still be present in the task bar when closed."));
+		final var	hideOnCloseTooltip	= new Tooltip("If selected, Envoy will still be present in the task bar when closed.");
+		hideOnCloseTooltip.setWrapText(true);
+		hideOnCloseCheckbox.setTooltip(hideOnCloseTooltip);
 		getChildren().add(hideOnCloseCheckbox);
 
 		final var	enterToSendCheckbox	= new SettingsCheckbox((SettingsItem<Boolean>) settingsItems.get("enterToSend"));
 		final var	enterToSendTooltip	= new Tooltip(
-				"If selected, messages can be sent pressing \"Enter\". They can always be sent by pressing \"Ctrl\" + \"Enter\"");
+				"When selected, messages can be sent pressing \"Enter\". A line break can be inserted by pressing \"Ctrl\" + \"Enter\". Else it will be the other way around.");
 		enterToSendTooltip.setWrapText(true);
 		enterToSendCheckbox.setTooltip(enterToSendTooltip);
 		getChildren().add(enterToSendCheckbox);
 
+		final var	askForConfirmationCheckbox	= new SettingsCheckbox((SettingsItem<Boolean>) settingsItems.get("askForConfirmation"));
+		final var	askForConfirmationTooltip	= new Tooltip("When selected, nothing will prompt a confirmation dialog");
+		askForConfirmationTooltip.setWrapText(true);
+		askForConfirmationCheckbox.setTooltip(askForConfirmationTooltip);
+		getChildren().add(askForConfirmationCheckbox);
+
 		final var combobox = new ComboBox<String>();
 		combobox.getItems().add("dark");
 		combobox.getItems().add("light");
 		combobox.setTooltip(new Tooltip("Determines the current theme Envoy will be displayed in."));
 		combobox.setValue(settings.getCurrentTheme());
-		combobox.setOnAction(
-				e -> { settings.setCurrentTheme(combobox.getValue()); EventBus.getInstance().dispatch(new ThemeChangeEvent()); });
+		combobox.setOnAction(e -> { settings.setCurrentTheme(combobox.getValue()); EventBus.getInstance().dispatch(new ThemeChangeEvent()); });
 		getChildren().add(combobox);
 
 		final var statusComboBox = new ComboBox<UserStatus>();