feat: Add auto update functionality (#4686)

packages/cli/src/utils/handleAutoUpdate.ts

@@ -0,0 +1,139 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { spawn } from 'node:child_process';
+import { UpdateObject } from '../ui/utils/updateCheck.js';
+import { LoadedSettings } from '../config/settings.js';
+import { getInstallationInfo } from './installationInfo.js';
+import { updateEventEmitter } from './updateEventEmitter.js';
+import { HistoryItem, MessageType } from '../ui/types.js';
+
+export function handleAutoUpdate(
+  info: UpdateObject | null,
+  settings: LoadedSettings,
+  projectRoot: string,
+) {
+  if (!info) {
+    return;
+  }
+
+  const installationInfo = getInstallationInfo(
+    projectRoot,
+    settings.merged.disableAutoUpdate ?? false,
+  );
+
+  let combinedMessage = info.message;
+  if (installationInfo.updateMessage) {
+    combinedMessage += `\n${installationInfo.updateMessage}`;
+  }
+
+  updateEventEmitter.emit('update-received', {
+    message: combinedMessage,
+  });
+
+  if (!installationInfo.updateCommand || settings.merged.disableAutoUpdate) {
+    return;
+  }
+
+  const updateCommand = installationInfo.updateCommand.replace(
+    '@latest',
+    `@${info.update.latest}`,
+  );
+
+  const updateProcess = spawn(updateCommand, { stdio: 'pipe', shell: true });
+  let errorOutput = '';
+  updateProcess.stderr.on('data', (data) => {
+    errorOutput += data.toString();
+  });
+
+  updateProcess.on('close', (code) => {
+    if (code === 0) {
+      updateEventEmitter.emit('update-success', {
+        message:
+          'Update successful! The new version will be used on your next run.',
+      });
+    } else {
+      updateEventEmitter.emit('update-failed', {
+        message: `Automatic update failed. Please try updating manually. (command: ${updateCommand}, stderr: ${errorOutput.trim()})`,
+      });
+    }
+  });
+
+  updateProcess.on('error', (err) => {
+    updateEventEmitter.emit('update-failed', {
+      message: `Automatic update failed. Please try updating manually. (error: ${err.message})`,
+    });
+  });
+  return updateProcess;
+}
+
+export function setUpdateHandler(
+  addItem: (item: Omit<HistoryItem, 'id'>, timestamp: number) => void,
+  setUpdateInfo: (info: UpdateObject | null) => void,
+) {
+  let successfullyInstalled = false;
+  const handleUpdateRecieved = (info: UpdateObject) => {
+    setUpdateInfo(info);
+    const savedMessage = info.message;
+    setTimeout(() => {
+      if (!successfullyInstalled) {
+        addItem(
+          {
+            type: MessageType.INFO,
+            text: savedMessage,
+          },
+          Date.now(),
+        );
+      }
+      setUpdateInfo(null);
+    }, 60000);
+  };
+
+  const handleUpdateFailed = () => {
+    setUpdateInfo(null);
+    addItem(
+      {
+        type: MessageType.ERROR,
+        text: `Automatic update failed. Please try updating manually`,
+      },
+      Date.now(),
+    );
+  };
+
+  const handleUpdateSuccess = () => {
+    successfullyInstalled = true;
+    setUpdateInfo(null);
+    addItem(
+      {
+        type: MessageType.INFO,
+        text: `Update successful! The new version will be used on your next run.`,
+      },
+      Date.now(),
+    );
+  };
+
+  const handleUpdateInfo = (data: { message: string }) => {
+    addItem(
+      {
+        type: MessageType.INFO,
+        text: data.message,
+      },
+      Date.now(),
+    );
+  };
+
+  updateEventEmitter.on('update-received', handleUpdateRecieved);
+  updateEventEmitter.on('update-failed', handleUpdateFailed);
+  updateEventEmitter.on('update-success', handleUpdateSuccess);
+  updateEventEmitter.on('update-info', handleUpdateInfo);
+
+  return () => {
+    updateEventEmitter.off('update-received', handleUpdateRecieved);
+    updateEventEmitter.off('update-failed', handleUpdateFailed);
+    updateEventEmitter.off('update-success', handleUpdateSuccess);
+    updateEventEmitter.off('update-info', handleUpdateInfo);
+  };
+}