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

@@ -183,8 +183,10 @@ export const useGeminiStream = (
     return StreamingState.Idle;
   }, [isResponding, toolCalls]);
 
-  useInput((_input, key) => {
-    if (streamingState === StreamingState.Responding && key.escape) {
+  const cancelOngoingRequest = useCallback(() => {
+    if (streamingState !== StreamingState.Responding) {
+      return;
+    }
     if (turnCancelledRef.current) {
       return;
     }
@@ -203,6 +205,17 @@ export const useGeminiStream = (
     setPendingHistoryItem(null);
     onCancelSubmit();
     setIsResponding(false);
+  }, [
+    streamingState,
+    addItem,
+    setPendingHistoryItem,
+    onCancelSubmit,
+    pendingHistoryItemRef,
+  ]);
+
+  useInput((_input, key) => {
+    if (key.escape) {
+      cancelOngoingRequest();
     }
   });
 
@@ -954,5 +967,6 @@ export const useGeminiStream = (
     initError,
     pendingHistoryItems,
     thought,
+    cancelOngoingRequest,
   };
 };