api-samples: add new command to output api version

The following commit adds a new command to the `api-samples` to
output the supported vscode api version for development purposes.

The api version is changeable by specifying a cli argument such as:
`yarn start --vscode-api-version={version}`

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>

examples/api-samples/compile.tsconfig.json

@@ -14,6 +14,9 @@
     },
     {
       "path": "../../packages/output/compile.tsconfig.json"
+    },
+    {
+      "path": "../../packages/vsx-registry/compile.tsconfig.json"
     }
   ]
 }

examples/api-samples/package.json

@@ -5,7 +5,8 @@
   "description": "Theia - Example code to demonstrate Theia API",
   "dependencies": {
     "@theia/core": "^1.9.0",
-    "@theia/output": "^1.9.0"
+    "@theia/output": "^1.9.0",
+    "@theia/vsx-registry": "^1.9.0"
   },
   "theiaExtensions": [
     {

examples/api-samples/src/browser/api-samples-frontend-module.ts

@@ -20,6 +20,7 @@ import { bindSampleUnclosableView } from './view/sample-unclosable-view-contribu
 import { bindSampleOutputChannelWithSeverity } from './output/sample-output-channel-with-severity';
 import { bindSampleMenu } from './menu/sample-menu-contribution';
 import { bindSampleFileWatching } from './file-watching/sample-file-watching-contribution';
+import { bindVSXCommand } from './vsx/sample-vsx-command-contribution';
 
 import '../../src/browser/style/branding.css';
 
@@ -29,4 +30,5 @@ export default new ContainerModule(bind => {
     bindSampleOutputChannelWithSeverity(bind);
     bindSampleMenu(bind);
     bindSampleFileWatching(bind);
+    bindVSXCommand(bind);
 });

examples/api-samples/src/browser/vsx/sample-vsx-command-contribution.ts

@@ -0,0 +1,48 @@
+/********************************************************************************
+ * Copyright (C) 2020 Ericsson 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 { inject, injectable, interfaces } from 'inversify';
+import { VSXEnvironment } from '@theia/vsx-registry/lib/common/vsx-environment';
+import { Command, CommandContribution, CommandRegistry, MessageService } from '@theia/core/lib/common';
+
+@injectable()
+export class VSXCommandContribution implements CommandContribution {
+
+    @inject(MessageService)
+    protected readonly messageService: MessageService;
+
+    @inject(VSXEnvironment)
+    protected readonly environment: VSXEnvironment;
+
+    protected readonly command: Command = {
+        id: 'vsx.echo-api-version',
+        label: 'VS Code API Version'
+    };
+
+    registerCommands(commands: CommandRegistry): void {
+        commands.registerCommand(this.command, {
+            execute: async () => {
+                const version = await this.environment.getVscodeApiVersion();
+                this.messageService.info(`Supported VS Code API Version: ${version}`);
+            }
+        });
+    }
+
+}
+
+export const bindVSXCommand = (bind: interfaces.Bind) => {
+    bind(CommandContribution).to(VSXCommandContribution).inSingletonScope();
+};