Add cut, copy and paste buttons to toolbar

app/src/main/java/com/annimon/hotarufx/ui/FontAwesome.java

@@ -11,7 +11,9 @@ import javafx.util.Pair;
 
 public enum FontAwesome {
 
-    CLIPBOARD("\uf0ea", "clipboard"),
+    CLIPBOARD("\uf0ea", "clipboard", "paste"),
+    CLONE("\uf24d", "clone"),
+    COPY("\uf0c5", "copy"),
     COPYRIGHT("\uf1f9", "copyright"),
     FONT_AWESOME("\uf2b4", "font-awesome"),
     GITHUB("\uf09b", "github"),
@@ -19,6 +21,7 @@ public enum FontAwesome {
     PENCIL("\uf040", "pencil"),
     PLAY("\uf04b", "play"),
     REDO("\uf01e", "redo"),
+    SCISSORS("\uf0c4", "scissors", "cut"),
     UNDO("\uf0e2", "undo");
 
     private final String symbol;

app/src/main/java/com/annimon/hotarufx/ui/control/ColorPickerBox.java

@@ -155,7 +155,7 @@ public class ColorPickerBox extends VBox {
             }
         });
         final Button copyButton = new Button("Copy");
-        copyButton.setGraphic(new FontAwesomeIcon("clipboard"));
+        copyButton.setGraphic(new FontAwesomeIcon("copy"));
         copyButton.setOnAction(e -> {
             final Clipboard clipboard = Clipboard.getSystemClipboard();
             final ClipboardContent content = new ClipboardContent();

app/src/main/java/com/annimon/hotarufx/ui/controller/EditorController.java

@@ -12,8 +12,8 @@ import com.annimon.hotarufx.lexer.HotaruLexer;
 import com.annimon.hotarufx.lib.Context;
 import com.annimon.hotarufx.parser.HotaruParser;
 import com.annimon.hotarufx.parser.visitors.InterpreterVisitor;
-import com.annimon.hotarufx.ui.control.LibraryItem;
 import com.annimon.hotarufx.ui.SyntaxHighlighter;
+import com.annimon.hotarufx.ui.control.LibraryItem;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
@@ -22,7 +22,9 @@ import java.util.ResourceBundle;
 import java.util.concurrent.Executors;
 import javafx.application.Platform;
 import javafx.beans.binding.Bindings;
+import javafx.beans.binding.BooleanBinding;
 import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
 import javafx.fxml.FXML;
 import javafx.fxml.FXMLLoader;
 import javafx.fxml.Initializable;
@@ -44,7 +46,7 @@ public class EditorController implements Initializable, DocumentListener {
     private CheckMenuItem syntaxHighlightingItem;
 
     @FXML
-    private Button undoButton, redoButton;
+    private Button undoButton, redoButton, cutButton, copyButton, pasteButton;
 
     @FXML
     private CodeArea editor;
@@ -164,6 +166,7 @@ public class EditorController implements Initializable, DocumentListener {
         documentManager = new FileManager();
         initSyntaxHighlighter();
         initUndoRedo();
+        initCopyCutPaste();
         openSample();
         editor.getUndoManager().forgetHistory();
         initializeLibrary();
@@ -191,8 +194,31 @@ public class EditorController implements Initializable, DocumentListener {
                 Bindings.not(editor.undoAvailableProperty()));
         redoButton.disableProperty().bind(
                 Bindings.not(editor.redoAvailableProperty()));
-        undoButton.setOnAction(a -> editor.undo());
+        undoButton.setOnAction(editorAction(editor::undo));
-        redoButton.setOnAction(a -> editor.redo());
+        redoButton.setOnAction(editorAction(editor::redo));
+    }
+
+    private void initCopyCutPaste() {
+        val selectionEmpty = new BooleanBinding() {
+            { bind(editor.selectionProperty()); }
+            @Override
+            protected boolean computeValue() {
+                return editor.getSelection().getLength() == 0;
+            }
+        };
+        cutButton.disableProperty().bind(selectionEmpty);
+        copyButton.disableProperty().bind(selectionEmpty);
+
+        cutButton.setOnAction(editorAction(editor::cut));
+        copyButton.setOnAction(editorAction(editor::copy));
+        pasteButton.setOnAction(editorAction(editor::paste));
+    }
+
+    private EventHandler<ActionEvent> editorAction(Runnable r) {
+        return event -> {
+            r.run();
+            editor.requestFocus();
+        };
     }
 
     private void initializeLibrary() {

app/src/main/resources/fxml/Editor.fxml

@@ -49,7 +49,7 @@
                         <FontAwesomeIcon icon="undo"/>
                     </graphic>
                     <tooltip>
-                        <Tooltip text="Undo"/>
+                        <Tooltip text="Undo action"/>
                     </tooltip>
                 </Button>
                 <Button fx:id="redoButton">
@@ -57,7 +57,32 @@
                         <FontAwesomeIcon icon="redo"/>
                     </graphic>
                     <tooltip>
-                        <Tooltip text="Redo"/>
+                        <Tooltip text="Redo action"/>
+                    </tooltip>
+                </Button>
+                <Separator/>
+                <Button fx:id="cutButton">
+                    <graphic>
+                        <FontAwesomeIcon icon="cut"/>
+                    </graphic>
+                    <tooltip>
+                        <Tooltip text="Cut selection"/>
+                    </tooltip>
+                </Button>
+                <Button fx:id="copyButton">
+                    <graphic>
+                        <FontAwesomeIcon icon="copy"/>
+                    </graphic>
+                    <tooltip>
+                        <Tooltip text="Copy selection"/>
+                    </tooltip>
+                </Button>
+                <Button fx:id="pasteButton">
+                    <graphic>
+                        <FontAwesomeIcon icon="paste"/>
+                    </graphic>
+                    <tooltip>
+                        <Tooltip text="Paste from clipboard"/>
                     </tooltip>
                 </Button>
                 <Separator/>