feat(cli): support single Ctrl+C to cancel streaming, preserving double Ctrl+C to exit (#5838)

packages/cli/src/ui/App.tsx

@@ -545,6 +545,7 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
     initError,
     pendingHistoryItems: pendingGeminiHistoryItems,
     thought,
+    cancelOngoingRequest,
   } = useGeminiStream(
     config.getGeminiClient(),
     history,
@@ -655,6 +656,9 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
         if (isAuthenticating) {
           return;
         }
+        if (!ctrlCPressedOnce) {
+          cancelOngoingRequest?.();
+        }
         handleExit(ctrlCPressedOnce, setCtrlCPressedOnce, ctrlCTimerRef);
       } else if (keyMatchers[Command.EXIT](key)) {
         if (buffer.text.length > 0) {
@@ -686,6 +690,7 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
       ctrlDTimerRef,
       handleSlashCommand,
       isAuthenticating,
+      cancelOngoingRequest,
     ],
   );
 

packages/cli/src/ui/components/messages/ToolConfirmationMessage.tsx

@@ -56,9 +56,9 @@ export const ToolConfirmationMessage: React.FC<
     onConfirm(outcome);
   };
 
-  useInput((_, key) => {
+  useInput((input, key) => {
     if (!isFocused) return;
-    if (key.escape) {
+    if (key.escape || (key.ctrl && (input === 'c' || input === 'C'))) {
       handleConfirm(ToolConfirmationOutcome.Cancel);
     }
   });

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -183,26 +183,39 @@ export const useGeminiStream = (
     return StreamingState.Idle;
   }, [isResponding, toolCalls]);
 
+  const cancelOngoingRequest = useCallback(() => {
+    if (streamingState !== StreamingState.Responding) {
+      return;
+    }
+    if (turnCancelledRef.current) {
+      return;
+    }
+    turnCancelledRef.current = true;
+    abortControllerRef.current?.abort();
+    if (pendingHistoryItemRef.current) {
+      addItem(pendingHistoryItemRef.current, Date.now());
+    }
+    addItem(
+      {
+        type: MessageType.INFO,
+        text: 'Request cancelled.',
+      },
+      Date.now(),
+    );
+    setPendingHistoryItem(null);
+    onCancelSubmit();
+    setIsResponding(false);
+  }, [
+    streamingState,
+    addItem,
+    setPendingHistoryItem,
+    onCancelSubmit,
+    pendingHistoryItemRef,
+  ]);
+
   useInput((_input, key) => {
-    if (streamingState === StreamingState.Responding && key.escape) {
+    if (key.escape) {
-      if (turnCancelledRef.current) {
+      cancelOngoingRequest();
-        return;
-      }
-      turnCancelledRef.current = true;
-      abortControllerRef.current?.abort();
-      if (pendingHistoryItemRef.current) {
-        addItem(pendingHistoryItemRef.current, Date.now());
-      }
-      addItem(
-        {
-          type: MessageType.INFO,
-          text: 'Request cancelled.',
-        },
-        Date.now(),
-      );
-      setPendingHistoryItem(null);
-      onCancelSubmit();
-      setIsResponding(false);
     }
   });
 
@@ -954,5 +967,6 @@ export const useGeminiStream = (
     initError,
     pendingHistoryItems,
     thought,
+    cancelOngoingRequest,
   };
 };