[plugin] register command open handler

webviews can use such URIs to trigger a command

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

packages/plugin-ext/src/main/browser/plugin-command-open-handler.ts

@@ -0,0 +1,50 @@
+/********************************************************************************
+ * Copyright (C) 2019 TypeFox and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the Eclipse
+ * Public License v. 2.0 are satisfied: GNU General Public License, version 2
+ * with the GNU Classpath Exception which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ ********************************************************************************/
+
+import { injectable, inject } from 'inversify';
+import URI from '@theia/core/lib/common/uri';
+import { OpenHandler } from '@theia/core/lib/browser/opener-service';
+import { Schemes } from '../../common/uri-components';
+import { CommandService } from '@theia/core/lib/common/command';
+
+@injectable()
+export class PluginCommandOpenHandler implements OpenHandler {
+
+    readonly id = 'plugin-command';
+
+    @inject(CommandService)
+    protected readonly commands: CommandService;
+
+    canHandle(uri: URI): number {
+        return uri.scheme === Schemes.COMMAND ? 500 : -1;
+    }
+
+    async open(uri: URI): Promise<boolean> {
+        // tslint:disable-next-line:no-any
+        let args: any = [];
+        try {
+            args = JSON.parse(uri.query);
+            if (!Array.isArray(args)) {
+                args = [args];
+            }
+        } catch (e) {
+            // ignore error
+        }
+        await this.commands.executeCommand(uri.path.toString())
+        return true;
+    }
+
+}

packages/plugin-ext/src/main/browser/plugin-ext-frontend-module.ts

@@ -20,7 +20,7 @@ import '../../../src/main/browser/style/index.css';
 import { ContainerModule } from 'inversify';
 import {
     FrontendApplicationContribution, FrontendApplication, WidgetFactory, bindViewContribution,
-    ViewContainerIdentifier, ViewContainer, createTreeContainer, TreeImpl, TreeWidget, TreeModelImpl
+    ViewContainerIdentifier, ViewContainer, createTreeContainer, TreeImpl, TreeWidget, TreeModelImpl, OpenHandler
 } from '@theia/core/lib/browser';
 import { MaybePromise, CommandContribution, ResourceResolver, bindContributionProvider } from '@theia/core/lib/common';
 import { WebSocketConnectionProvider } from '@theia/core/lib/browser/messaging';
@@ -66,6 +66,7 @@ import { InPluginFileSystemWatcherManager } from './in-plugin-filesystem-watcher
 import { WebviewWidget, WebviewWidgetIdentifier } from './webview/webview';
 import { WebviewEnvironment } from './webview/webview-environment';
 import { WebviewThemeDataProvider } from './webview/webview-theme-data-provider';
+import { PluginCommandOpenHandler } from './plugin-command-open-handler';
 
 export default new ContainerModule((bind, unbind, isBound, rebind) => {
 
@@ -149,6 +150,9 @@ export default new ContainerModule((bind, unbind, isBound, rebind) => {
         }
     })).inSingletonScope();
 
+    bind(PluginCommandOpenHandler).toSelf().inSingletonScope();
+    bind(OpenHandler).toService(PluginCommandOpenHandler);
+
     bind(WebviewEnvironment).toSelf().inSingletonScope();
     bind(WebviewThemeDataProvider).toSelf().inSingletonScope();
     bind(WebviewWidget).toSelf();