feat(cli): clear input buffer on CTRL+C when not executing commands (google-gemini#1729)

Co-authored-by: Scott Densmore <scottdensmore@mac.com>

Author: matias-casal

packages/cli/src/ui/components/InputPrompt.test.tsx

@@ -543,4 +543,30 @@ describe('InputPrompt', () => {
     expect(props.buffer.newline).toHaveBeenCalled();
     unmount();
   });
+
+  it('should clear the buffer on Ctrl+C if it has text', async () => {
+    props.buffer.setText('some text to clear');
+    const { stdin, unmount } = render(<InputPrompt {...props} />);
+    await wait();
+
+    stdin.write('\x03'); // Ctrl+C character
+    await wait();
+
+    expect(props.buffer.setText).toHaveBeenCalledWith('');
+    expect(mockCompletion.resetCompletionState).toHaveBeenCalled();
+    expect(props.onSubmit).not.toHaveBeenCalled();
+    unmount();
+  });
+
+  it('should NOT clear the buffer on Ctrl+C if it is empty', async () => {
+    props.buffer.text = '';
+    const { stdin, unmount } = render(<InputPrompt {...props} />);
+    await wait();
+
+    stdin.write('\x03'); // Ctrl+C character
+    await wait();
+
+    expect(props.buffer.setText).not.toHaveBeenCalled();
+    unmount();
+  });
 });

packages/cli/src/ui/components/InputPrompt.tsx

@@ -356,6 +356,16 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       }
       if (key.ctrl && key.name === 'e') {
         buffer.move('end');
+        buffer.moveToOffset(cpLen(buffer.text));
+        return;
+      }
+      // Ctrl+C (Clear input)
+      if (key.ctrl && key.name === 'c') {
+        if (buffer.text.length > 0) {
+          buffer.setText('');
+          resetCompletionState();
+          return;
+        }
         return;
       }
 
@@ -397,6 +407,7 @@ export const InputPrompt: React.FC<InputPromptProps> = ({
       handleSubmitAndClear,
       shellHistory,
       handleClipboardImage,
+      resetCompletionState,
     ],
   );