Add activatePlugin and didStart to plugins

packages/plugin-ext/src/common/plugin-api-rpc.ts

@@ -189,6 +189,8 @@ export interface PluginManagerExt {
     $updateStoragePath(path: string | undefined): Promise<void>;
 
     $activateByEvent(event: string): Promise<void>;
+
+    $activatePlugin(id: string): Promise<void>;
 }
 
 export interface CommandRegistryMain {

packages/plugin-ext/src/hosted/browser/hosted-plugin.ts

@@ -151,6 +151,14 @@ export class HostedPluginSupport {
     protected readonly onDidChangePluginsEmitter = new Emitter<void>();
     readonly onDidChangePlugins = this.onDidChangePluginsEmitter.event;
 
+    protected readonly deferredDidStart = new Deferred<void>();
+    /**
+     * Resolves when the initial plugins are started.
+     */
+    get didStart(): Promise<void> {
+        return this.deferredDidStart.promise;
+    }
+
     @postConstruct()
     protected init(): void {
         this.theiaReadyPromise = Promise.all([this.preferenceServiceImpl.ready, this.workspaceService.roots]);
@@ -241,6 +249,9 @@ export class HostedPluginSupport {
             return;
         }
         await this.startPlugins(contributionsByHost, toDisconnect);
+
+        this.deferredDidStart.resolve();
+
         this.restoreWebviews();
     }
 
@@ -576,6 +587,14 @@ export class HostedPluginSupport {
         }
     }
 
+    async activatePlugin(id: string): Promise<void> {
+        const activation = [];
+        for (const manager of this.managers.values()) {
+            activation.push(manager.$activatePlugin(id));
+        }
+        await Promise.all(activation);
+    }
+
     protected createMeasurement(name: string): () => number {
         const startMarker = `${name}-start`;
         const endMarker = `${name}-end`;

packages/plugin-ext/src/plugin/plugin-manager.ts

@@ -77,6 +77,7 @@ export class PluginManagerExtImpl implements PluginManagerExt, PluginManager {
         'onWebviewPanel'
     ]);
 
+    private configStorage: ConfigStorage | undefined;
     private readonly registry = new Map<string, Plugin>();
     private readonly activations = new Map<string, (() => Promise<void>)[] | undefined>();
     /** promises to whether loading each plugin has been successful */
@@ -158,6 +159,8 @@ export class PluginManagerExtImpl implements PluginManagerExt, PluginManager {
     }
 
     async $start(params: PluginManagerStartParams): Promise<void> {
+        this.configStorage = params.configStorage;
+
         const [plugins, foreignPlugins] = await this.host.init(params.plugins);
         // add foreign plugins
         for (const plugin of foreignPlugins) {
@@ -256,6 +259,10 @@ export class PluginManagerExtImpl implements PluginManagerExt, PluginManager {
     }
 
     async $updateStoragePath(path: string | undefined): Promise<void> {
+        if (this.configStorage) {
+            this.configStorage.hostStoragePath = path;
+        }
+
         this.pluginContextsMap.forEach((pluginContext: theia.PluginContext, pluginId: string) => {
             pluginContext.storagePath = path ? join(path, pluginId) : undefined;
         });
@@ -272,6 +279,13 @@ export class PluginManagerExtImpl implements PluginManagerExt, PluginManager {
         }
     }
 
+    async $activatePlugin(id: string): Promise<void> {
+        const plugin = this.registry.get(id);
+        if (plugin && this.configStorage) {
+            await this.loadPlugin(plugin, this.configStorage);
+        }
+    }
+
     // tslint:disable-next-line:no-any
     private async startPlugin(plugin: Plugin, configStorage: ConfigStorage, pluginMain: any): Promise<void> {
         const subscriptions: theia.Disposable[] = [];