Adds CommandClearCli which allows the User to clear the current CLI Display

src/main/java/executor/command/CommandClearCli.java

@@ -0,0 +1,23 @@
+package executor.command;
+
+import storage.StorageManager;
+import ui.UiCode;
+
+public class CommandClearCli extends Command {
+
+    /**
+     * Constructor for CommandClearCli class.
+     */
+    public CommandClearCli(String userInput) {
+        super();
+        this.userInput = userInput;
+        this.commandType = CommandType.CLEAR;
+        this.description = "Clears the current CLI window.";
+    }
+
+    @Override
+    public void execute(StorageManager storageManager) {
+        this.infoCapsule.setUiCode(UiCode.CLEAR_CLI);
+        this.infoCapsule.setOutputStr("Command Clear Executed.");
+    }
+}

src/main/java/executor/command/CommandType.java

@@ -43,7 +43,8 @@ public enum CommandType {
     DIV(CommandDiv.class),
     MUL(CommandMul.class),
     TRACK(CommandTrackTag.class),
-    UNTRACK(CommandUntrackTag.class);
+    UNTRACK(CommandUntrackTag.class),
+    CLEAR(CommandClearCli.class);
 
     private final Class commandClass;
 

src/main/java/ui/UiCode.java

@@ -1,5 +1,5 @@
 package ui;
 
 public enum UiCode {
-    TOAST, CLI, UPDATE, ERROR, EXIT, DISPLAY_HOME, DISPLAY_CLI;
+    TOAST, CLI, UPDATE, ERROR, EXIT, DISPLAY_HOME, DISPLAY_CLI, CLEAR_CLI;
 }

src/main/java/ui/gui/CommandLineDisplay.java

@@ -14,33 +14,40 @@ public class CommandLineDisplay {
     @FXML
     VBox container;
 
-    public static final String LINE = "________________________________________________";
+    private static final String LINE = "________________________________________________";
 
     /**
      * Prints string to CLI Display.
      * @param outputStr String to be printed onto the display
      */
-    public void printToDisplay(String outputStr) {
+    void printToDisplay(String outputStr) {
         Text newOutput = new Text(outputStr);
         container.getChildren().add(newOutput);
     }
 
-    public void setStyle() {
+    void setStyle() {
         this.cliDisplay.vvalueProperty().bind(container.heightProperty());
     }
 
     /**
      * Helper method to indicate duke is saying something.
      * @param string The message duke wants to say
      */
-    public void dukeSays(String string) {
+    void dukeSays(String string) {
         printToDisplay("Duke: " + string + "\n");
     }
 
     /**
      * Helper method to print Line Separator.
      */
-    public void printSeparator() {
+    void printSeparator() {
         this.printToDisplay(LINE);
     }
+
+    /**
+     * Clears the current CLI display.
+     */
+    void clearCliDisplay() {
+        this.container.getChildren().clear();
+    }
 }

src/main/java/ui/gui/MainWindow.java

@@ -138,6 +138,9 @@ private void updateGui(InfoCapsule infoCapsule) {
             case DISPLAY_CLI:
                 this.showCliDisplay();
                 break;
+            case CLEAR_CLI:
+                this.cliController.clearCliDisplay();
+                break;
             case UPDATE:
                 break;
             default:

src/test/java/ui/CommandClearCliTest.java

@@ -0,0 +1,17 @@
+package ui;
+
+import executor.command.CommandClearCli;
+import org.junit.jupiter.api.Test;
+import storage.StorageManager;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class CommandClearCliTest {
+    @Test
+    void executeTest() {
+        StorageManager storageManager = new StorageManager();
+        CommandClearCli genericTest = new CommandClearCli("");
+        genericTest.execute(storageManager);
+        assertEquals(UiCode.CLEAR_CLI, genericTest.getInfoCapsule().getUiCode());
+        assertEquals("Command Clear Executed.", genericTest.getInfoCapsule().getOutputStr());
+    }
+}