Fix mixed input crash by adding proper error handling 8304 (#8430)

packages/cli/src/gemini.test.tsx

@@ -174,6 +174,15 @@ describe('gemini.tsx main function kitty protocol', () => {
       (process.stdin as any).setRawMode = vi.fn();
     }
     setRawModeSpy = vi.spyOn(process.stdin, 'setRawMode');
+
+    Object.defineProperty(process.stdin, 'isTTY', {
+      value: true,
+      configurable: true,
+    });
+    Object.defineProperty(process.stdin, 'isRaw', {
+      value: false,
+      configurable: true,
+    });
   });
 
   it('should call setRawMode and detectAndEnableKittyProtocol when isInteractive is true', async () => {

packages/cli/src/gemini.tsx

@@ -209,9 +209,17 @@ export async function main() {
     argv,
   );
 
+  // Check for invalid input combinations early to prevent crashes
+  if (argv.promptInteractive && !process.stdin.isTTY) {
+    console.error(
+      'Error: The --prompt-interactive flag cannot be used when input is piped from stdin.',
+    );
+    process.exit(1);
+  }
+
   const wasRaw = process.stdin.isRaw;
   let kittyProtocolDetectionComplete: Promise<boolean> | undefined;
-  if (config.isInteractive() && !wasRaw) {
+  if (config.isInteractive() && !wasRaw && process.stdin.isTTY) {
     // Set this as early as possible to avoid spurious characters from
     // input showing up in the output.
     process.stdin.setRawMode(true);
@@ -248,13 +256,6 @@ export async function main() {
     validateDnsResolutionOrder(settings.merged.advanced?.dnsResolutionOrder),
   );
 
-  if (argv.promptInteractive && !process.stdin.isTTY) {
-    console.error(
-      'Error: The --prompt-interactive flag is not supported when piping input from stdin.',
-    );
-    process.exit(1);
-  }
-
   if (config.getListExtensions()) {
     console.log('Installed extensions:');
     for (const extension of extensions) {