Feat #87: Autocomplete commands

src/main/java/com/devoxx/genie/ui/component/CommandAutoCompleteTextField.java

@@ -0,0 +1,114 @@
+package com.devoxx.genie.ui.component;
+
+import com.devoxx.genie.service.PromptExecutionService;
+import com.intellij.openapi.diagnostic.Logger;
+
+import javax.swing.*;
+import javax.swing.text.*;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.util.ArrayList;
+import java.util.List;
+
+public class CommandAutoCompleteTextField extends PlaceholderTextArea {
+
+    private static final Logger LOG = Logger.getInstance(CommandAutoCompleteTextField.class);
+
+    private final List<String> commands = new ArrayList<>();
+    private boolean isAutoCompleting = false;
+
+    public CommandAutoCompleteTextField() {
+        super();
+        initializeCommands();
+        setDocument(new CommandDocument());
+        addKeyListener(new CommandKeyListener());
+    }
+
+    private void initializeCommands() {
+        commands.add("/test");
+        commands.add("/explain");
+        commands.add("/review");
+        commands.add("/custom");
+        // Add more commands as needed
+    }
+
+    private class CommandKeyListener extends KeyAdapter {
+        @Override
+        public void keyPressed(KeyEvent e) {
+            if (e.getKeyCode() == KeyEvent.VK_SPACE && e.isControlDown()) {
+                autoComplete();
+                e.consume();
+            }
+        }
+    }
+
+    private void autoComplete() {
+        String text = getText();
+        if (text.startsWith("/")) {
+            String prefix = text.substring(1);
+            for (String command : commands) {
+                if (command.startsWith(prefix)) {
+                    isAutoCompleting = true;
+                    setText(command);
+                    setCaretPosition(command.length());
+                    isAutoCompleting = false;
+                    break;
+                }
+            }
+        }
+    }
+
+    private class CommandDocument extends PlainDocument {
+        @Override
+        public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
+            if (isAutoCompleting) {
+                super.insertString(offs, str, a);
+                return;
+            }
+
+            if (offs == 0 && !str.startsWith("/")) {
+                str = "/" + str;
+            }
+            super.insertString(offs, str, a);
+
+            SwingUtilities.invokeLater(() -> {
+                try {
+                    String text = getText(0, getLength());
+                    if (text.startsWith("/") && text.length() > 1) {
+                        for (String command : commands) {
+                            if (command.startsWith(text) && !command.equals(text)) {
+                                int currentLength = text.length();
+                                String completion = command.substring(currentLength);
+                                isAutoCompleting = true;
+                                insertString(currentLength, completion, null);
+                                setCaretPosition(getLength());
+                                moveCaretPosition(currentLength);
+                                isAutoCompleting = false;
+                                break;
+                            }
+                        }
+                    }
+                } catch (BadLocationException e) {
+                    LOG.debug("Error while auto-completing command", e);
+                }
+            });
+        }
+    }
+
+    // Placeholder functionality
+    private String placeholder = "";
+
+    public void setPlaceholder(String placeholder) {
+        this.placeholder = placeholder;
+        repaint();
+    }
+
+    @Override
+    protected void paintComponent(java.awt.Graphics g) {
+        super.paintComponent(g);
+        if (getText().isEmpty() && !placeholder.isEmpty()) {
+            g.setColor(java.awt.Color.GRAY);
+            g.drawString(placeholder, getInsets().left, g.getFontMetrics().getMaxAscent() + getInsets().top);
+        }
+    }
+}

src/main/java/com/devoxx/genie/ui/component/PlaceholderTextArea.java

@@ -1,5 +1,6 @@
 package com.devoxx.genie.ui.component;
 
+import com.intellij.ui.components.JBTextArea;
 import lombok.Getter;
 import lombok.Setter;
 
@@ -10,7 +11,7 @@
 
 @Setter
 @Getter
-public class PlaceholderTextArea extends JTextArea {
+public class PlaceholderTextArea extends JBTextArea {
 
     private String placeholder;
 
@@ -23,7 +24,7 @@ public PlaceholderTextArea() {
     protected void paintComponent(final Graphics g) {
         super.paintComponent(g);
 
-        if (placeholder.isEmpty() || !getText().isEmpty()) {
+        if (placeholder == null || placeholder.isEmpty() || !getText().isEmpty()) {
             return;
         }
 

src/main/java/com/devoxx/genie/ui/component/PromptInputArea.java

@@ -6,33 +6,52 @@
 import java.awt.*;
 import java.util.ResourceBundle;
 
-public class PromptInputArea extends PlaceholderTextArea {
+public class PromptInputArea extends JPanel {
+
+    private final CommandAutoCompleteTextField inputField;
 
-    /**
-     * The prompt input component
-     *
-     * @param resourceBundle the resource bundle
-     */
     public PromptInputArea(ResourceBundle resourceBundle) {
-        super();
-
-        setLayout(new BorderLayout());
-        setMaximumSize(new Dimension(0, getPreferredSize().height));
-
-        setLineWrap(true);
-        setWrapStyleWord(true);
-        setRows(3);
-        setAutoscrolls(false);
-        setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
-        setMinimumSize(new Dimension(0, 75));
-        addFocusListener(new PromptInputFocusListener(this));
-        setPlaceholder(resourceBundle.getString("prompt.placeholder"));
+        super(new BorderLayout());
+
+        inputField = new CommandAutoCompleteTextField();
+        inputField.setRows(3);
+        inputField.setLineWrap(true);
+        inputField.setWrapStyleWord(true);
+        inputField.setAutoscrolls(false);
+        inputField.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
+        inputField.setMinimumSize(new Dimension(0, 75));
+        inputField.addFocusListener(new PromptInputFocusListener(inputField));
+        inputField.setPlaceholder(resourceBundle.getString("prompt.placeholder"));
+
+        JScrollPane scrollPane = new JScrollPane(inputField);
+        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
+        scrollPane.setBorder(null);
+
+        add(scrollPane, BorderLayout.CENTER);
+        setMaximumSize(new Dimension(Integer.MAX_VALUE, getPreferredSize().height));
+    }
+
+    public String getText() {
+        return inputField.getText();
+    }
+
+    public void setText(String text) {
+        inputField.setText(text);
     }
 
-    /**
-     * Clear the text
-     */
     public void clear() {
-        setText("");
+        inputField.setText("");
+    }
+
+    public void setEnabled(boolean enabled) {
+        inputField.setEnabled(enabled);
+    }
+
+    public boolean requestFocusInWindow() {
+        return inputField.requestFocusInWindow();
+    }
+
+    public void setPlaceholder(String placeholder) {
+        inputField.setPlaceholder(placeholder);
     }
 }