feat(tui): single ctrl+c clears input, double ctrl+c exits

src/frontends/tui/minimal.test.ts

@@ -38,15 +38,18 @@ function minimalTuiPrivates(value: MinimalTui): {
   handleToolEvent: (event: unknown) => void;
   handleCommand: (command: unknown) => Promise<void>;
   handleEscapeAction: () => boolean;
+  handleCtrlCPress: (nowMs?: number) => boolean;
   prompt: (text: string) => Promise<string>;
   rl: {
     once: (event: string, cb: () => void) => void;
     removeListener: (event: string, cb: () => void) => void;
     question: (text: string, cb: (answer: string) => void) => void;
     write: (data: string | null, key?: { ctrl?: boolean; name?: string }) => void;
+    prompt: () => void;
   };
   activePromptCancel: (() => void) | null;
   activeOperationCancel: (() => void) | null;
+  running: boolean;
 } {
   return value as unknown as {
     handleBackendCommand: (provider: string) => Promise<void>;
@@ -56,15 +59,18 @@ function minimalTuiPrivates(value: MinimalTui): {
     handleToolEvent: (event: unknown) => void;
     handleCommand: (command: unknown) => Promise<void>;
     handleEscapeAction: () => boolean;
+    handleCtrlCPress: (nowMs?: number) => boolean;
     prompt: (text: string) => Promise<string>;
     rl: {
       once: (event: string, cb: () => void) => void;
       removeListener: (event: string, cb: () => void) => void;
       question: (text: string, cb: (answer: string) => void) => void;
       write: (data: string | null, key?: { ctrl?: boolean; name?: string }) => void;
+      prompt: () => void;
     };
     activePromptCancel: (() => void) | null;
     activeOperationCancel: (() => void) | null;
+    running: boolean;
   };
 }
 
@@ -423,6 +429,7 @@ describe('MinimalTui prompt cancellation', () => {
         onAnswer = cb;
       }),
       write,
+      prompt: vi.fn(),
     };
 
     const promptPromise = minimalTuiPrivates(tui).prompt('Confirm? ');
@@ -457,4 +464,44 @@ describe('MinimalTui prompt cancellation', () => {
     expect(minimalTuiPrivates(tui).handleEscapeAction()).toBe(true);
     expect(cancelRunningOperation).toHaveBeenCalledOnce();
   });
+
+  it('treats first Ctrl+C as clear-input and second as exit intent', () => {
+    const mockSession = {
+      id: 'test',
+      getHistory: () => [],
+      addMessage: vi.fn(),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+    };
+
+    const write = vi.fn();
+    const prompt = vi.fn();
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+    try {
+      const tui = new MinimalTui({
+        session: asSession(mockSession),
+        modelClient: asRouter({}),
+        systemPrompt: 'test',
+      });
+      minimalTuiPrivates(tui).rl = {
+        once: vi.fn(),
+        removeListener: vi.fn(),
+        question: vi.fn(),
+        write,
+        prompt,
+      };
+      minimalTuiPrivates(tui).running = true;
+
+      const first = minimalTuiPrivates(tui).handleCtrlCPress(1000);
+      const second = minimalTuiPrivates(tui).handleCtrlCPress(2000);
+
+      expect(first).toBe(false);
+      expect(second).toBe(true);
+      expect(write).toHaveBeenCalledWith(null, { ctrl: true, name: 'u' });
+      expect(prompt).toHaveBeenCalled();
+      expect(logSpy).toHaveBeenCalledWith(expect.stringContaining('Press Ctrl+C again to quit'));
+    } finally {
+      logSpy.mockRestore();
+    }
+  });
 });