Check extension existence on-the-fly when needed

package.json

@@ -593,7 +593,7 @@
         },
         {
           "command": "_java.view.modernizeJavaProject",
-          "when": "explorerResourceIsFolder && java:serverMode && isModernizationExtensionInstalled",
+          "when": "explorerResourceIsFolder && java:serverMode",
           "group": "1_javaactions@40"
         },
         {

src/upgrade/upgradeManager.ts

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
-import { commands, type ExtensionContext, extensions, workspace, type WorkspaceFolder } from "vscode";
+import { commands, type ExtensionContext, workspace, type WorkspaceFolder } from "vscode";
 
 import { Jdtls } from "../java/jdtls";
 import { languageServerApiManager } from "../languageServerApi/languageServerApiManager";
@@ -11,13 +11,13 @@ import { Commands } from "../commands";
 import notificationManager from "./display/notificationManager";
 import { Settings } from "../settings";
 import assessmentManager from "./assessmentManager";
+import { checkOrInstallExtension } from "./utility";
 
 const DEFAULT_UPGRADE_PROMPT = "Upgrade Java project dependency to latest version.";
 
 
 function shouldRunCheckup() {
-    return Settings.getEnableDependencyCheckup()
-        && !!extensions.getExtension(ExtensionName.APP_MODERNIZATION_UPGRADE_FOR_JAVA);
+    return Settings.getEnableDependencyCheckup();
 }
 
 class UpgradeManager {
@@ -26,13 +26,13 @@ class UpgradeManager {
 
         // Commands to be used
         context.subscriptions.push(instrumentOperationAsVsCodeCommand(Commands.JAVA_UPGRADE_WITH_COPILOT, async (promptText?: string) => {
+            await checkOrInstallExtension(ExtensionName.APP_MODERNIZATION_UPGRADE_FOR_JAVA, ExtensionName.APP_MODERNIZATION_FOR_JAVA);
             const promptToUse = promptText ?? DEFAULT_UPGRADE_PROMPT;
             await commands.executeCommand(Commands.GOTO_AGENT_MODE, { prompt: promptToUse });
         }));
-        commands.executeCommand('setContext', 'isModernizationExtensionInstalled',
-            !!extensions.getExtension(ExtensionName.APP_MODERNIZATION_FOR_JAVA));
-        context.subscriptions.push(instrumentOperationAsVsCodeCommand(Commands.VIEW_MODERNIZE_JAVA_PROJECT, () => {
-            commands.executeCommand("workbench.view.extension.azureJavaMigrationExplorer");
+        context.subscriptions.push(instrumentOperationAsVsCodeCommand(Commands.VIEW_MODERNIZE_JAVA_PROJECT, async () => {
+            await checkOrInstallExtension(ExtensionName.APP_MODERNIZATION_FOR_JAVA);
+            await commands.executeCommand("workbench.view.extension.azureJavaMigrationExplorer");
         }));
 
         UpgradeManager.scan();

src/upgrade/utility.ts

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
-import { Uri } from "vscode";
+import { commands, extensions, Uri, window } from "vscode";
 import * as semver from "semver";
 import { UpgradeReason, type UpgradeIssue } from "./type";
 import { Upgrade } from "../constants";
@@ -73,3 +73,38 @@ export function normalizePath(path: string): string {
     return Uri.parse(path).toString();
 }
 
+export async function checkOrInstallExtension(extensionIdToCheck: string, extensionIdToInstall?: string): Promise<void> {
+    if (extensions.getExtension(extensionIdToCheck)) {
+        return;
+    }
+
+    const actualExtensionIdToInstall = extensionIdToInstall ?? extensionIdToCheck;
+
+    {
+        const BTN_TEXT = "Install extension";
+        const choice = await window.showInformationMessage(
+            "An extension is needed for the feature to work. Please install it and try again.",
+            BTN_TEXT
+        );
+        if (choice === BTN_TEXT) {
+            await commands.executeCommand("workbench.extensions.installExtension", actualExtensionIdToInstall);
+        }
+    }
+
+    if (extensions.getExtension(actualExtensionIdToInstall)) {
+        return;
+    }
+
+    // In this case the extension is disabled.
+    await commands.executeCommand("workbench.extensions.search", actualExtensionIdToInstall);
+    {
+        const BTN_TEXT = "Show extension in sidebar";
+        const choice = await window.showInformationMessage(
+            "An extension is needed for the feature to work but it seems disabled. Please enable it manually and try again.",
+            BTN_TEXT
+        );
+        if (choice === BTN_TEXT) {
+            await commands.executeCommand("workbench.extensions.search", actualExtensionIdToInstall);
+        }
+    }
+}