Implemented game loading from FEN file

src/dev/kske/chess/ui/MainWindow.java

@@ -70,12 +70,23 @@ public class MainWindow extends JFrame {
 
 	/**
 	 * Creates a new {@link GamePane}, adds it to the tabbed pane and opens it.
+	 * The new tab has the title {@code Game n} where {@code n} is its number.
 	 * 
 	 * @return The new {@link GamePane}
 	 */
 	public GamePane addGamePane() {
+		return addGamePane("Game " + (tabbedPane.getComponentCount() + 1));
+	}
+
+	/**
+	 * Creates a new {@link GamePane}, adds it to the tabbed pane and opens it.
+	 * 
+	 * @param title The title of the {@link GamePane}
+	 * @return The new {@link GamePane}
+	 */
+	public GamePane addGamePane(String title) {
 		GamePane gamePane = new GamePane();
-		tabbedPane.add("Game " + (tabbedPane.getComponentCount() + 1), gamePane);
+		tabbedPane.add(title, gamePane);
 		tabbedPane.setSelectedIndex(tabbedPane.getComponentCount() - 1);
 		return gamePane;
 	}

src/dev/kske/chess/ui/MenuBar.java

@@ -2,6 +2,9 @@ package dev.kske.chess.ui;
 
 import java.awt.Toolkit;
 import java.awt.datatransfer.StringSelection;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
@@ -47,7 +50,23 @@ public class MenuBar extends JMenuBar {
 			final String extension = file.getName().substring(file.getName().lastIndexOf('.')).toLowerCase();
 			switch (extension) {
 				case ".fen":
-					// TODO: Load board from FEN
+					try {
+						final GamePane	gamePane	= mainWindow
+							.addGamePane(file.getName().substring(0, file.getName().lastIndexOf('.')));
+						final String	fen			= new String(Files.readAllBytes(file.toPath()),
+								StandardCharsets.UTF_8);
+						DialogUtil.showGameConfigurationDialog((whiteName, blackName) -> {
+							final Game game = new Game(gamePane.getBoardPane(), whiteName, blackName, fen);
+							gamePane.setGame(game);
+							game.start();
+						});
+					} catch (IOException e) {
+						e.printStackTrace();
+						JOptionPane.showMessageDialog(mainWindow,
+								"Failed to load the file " + file.getName() + ": " + e.toString(),
+								"File loading error",
+								JOptionPane.ERROR_MESSAGE);
+					}
 					break;
 				case ".pgn":
 					// TODO: Load board from PGN