[plugin] implement Plugin.isActive check

before it was stub with `true` always

Signed-off-by: Anton Kosyakov <anton.kosyakov@typefox.io>

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

@@ -117,6 +117,7 @@ export interface PluginManager {
     getPluginById(pluginId: string): Plugin | undefined;
     getPluginExport(pluginId: string): PluginAPI | undefined;
     isRunning(pluginId: string): boolean;
+    isActive(pluginId: string): boolean;
     activatePlugin(pluginId: string): PromiseLike<void>;
     onDidChange: theia.Event<void>;
 }

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

@@ -831,18 +831,20 @@ export function createAPIFactory(
 class Plugin<T> implements theia.Plugin<T> {
     id: string;
     pluginPath: string;
-    isActive: boolean;
     // tslint:disable-next-line:no-any
     packageJSON: any;
     pluginType: theia.PluginType;
     constructor(private readonly pluginManager: PluginManager, plugin: InternalPlugin) {
         this.id = plugin.model.id;
         this.pluginPath = plugin.pluginFolder;
         this.packageJSON = plugin.rawModel;
-        this.isActive = true;
         this.pluginType = plugin.model.entryPoint.frontend ? 'frontend' : 'backend';
     }
 
+    get isActive(): boolean {
+        return this.pluginManager.isActive(this.id);
+    }
+
     get exports(): T {
         return <T>this.pluginManager.getPluginExport(this.id);
     }

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

@@ -286,6 +286,10 @@ export class PluginManagerExtImpl implements PluginManagerExt, PluginManager {
         return this.registry.has(pluginId);
     }
 
+    isActive(pluginId: string): boolean {
+        return this.activatedPlugins.has(pluginId);
+    }
+
     activatePlugin(pluginId: string): PromiseLike<void> {
         if (this.pluginActivationPromises.has(pluginId)) {
             return this.pluginActivationPromises.get(pluginId)!.promise;