Add prompt to migrate workspace extensions (#7065)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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

@@ -0,0 +1,66 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { useState, useEffect } from 'react';
+import {
+  type Extension,
+  getWorkspaceExtensions,
+} from '../../config/extension.js';
+import { type LoadedSettings, SettingScope } from '../../config/settings.js';
+import process from 'node:process';
+
+export function useWorkspaceMigration(settings: LoadedSettings) {
+  const [showWorkspaceMigrationDialog, setShowWorkspaceMigrationDialog] =
+    useState(false);
+  const [workspaceExtensions, setWorkspaceExtensions] = useState<Extension[]>(
+    [],
+  );
+
+  useEffect(() => {
+    if (!settings.merged.extensionManagement) {
+      return;
+    }
+    const cwd = process.cwd();
+    const extensions = getWorkspaceExtensions(cwd);
+    if (
+      extensions.length > 0 &&
+      !settings.merged.extensions?.workspacesWithMigrationNudge?.includes(cwd)
+    ) {
+      setWorkspaceExtensions(extensions);
+      setShowWorkspaceMigrationDialog(true);
+      console.log(settings.merged.extensions);
+    }
+  }, [settings.merged.extensions, settings.merged.extensionManagement]);
+
+  const onWorkspaceMigrationDialogOpen = () => {
+    const userSettings = settings.forScope(SettingScope.User);
+    const extensionSettings = userSettings.settings.extensions || {
+      disabled: [],
+    };
+    const workspacesWithMigrationNudge =
+      extensionSettings.workspacesWithMigrationNudge || [];
+
+    const cwd = process.cwd();
+    if (!workspacesWithMigrationNudge.includes(cwd)) {
+      workspacesWithMigrationNudge.push(cwd);
+    }
+
+    extensionSettings.workspacesWithMigrationNudge =
+      workspacesWithMigrationNudge;
+    settings.setValue(SettingScope.User, 'extensions', extensionSettings);
+  };
+
+  const onWorkspaceMigrationDialogClose = () => {
+    setShowWorkspaceMigrationDialog(false);
+  };
+
+  return {
+    showWorkspaceMigrationDialog,
+    workspaceExtensions,
+    onWorkspaceMigrationDialogOpen,
+    onWorkspaceMigrationDialogClose,
+  };
+}