PROEDITOR-50: Customized the editor for built-ins

- From now on, sources from the `dataDir` opened in a read-only editor.
 - Disabled the tab-bar decoration for built-ins.
 - No problem markers for the built-ins.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

arduino-ide-extension/src/browser/shell/arduino-tab-bar-decorator.ts

@@ -0,0 +1,32 @@
+import { inject, injectable, postConstruct } from 'inversify';
+import URI from '@theia/core/lib/common/uri';
+import { Title, Widget } from '@phosphor/widgets';
+import { WidgetDecoration } from '@theia/core/lib/browser/widget-decoration';
+import { TabBarDecoratorService } from '@theia/core/lib/browser/shell/tab-bar-decorator';
+import { ConfigService } from '../../common/protocol/config-service';
+import { EditorWidget } from '@theia/editor/lib/browser';
+
+@injectable()
+export class ArduinoTabBarDecoratorService extends TabBarDecoratorService {
+
+    @inject(ConfigService)
+    protected readonly configService: ConfigService;
+    protected dataDirUri: URI | undefined;
+
+    @postConstruct()
+    protected init(): void {
+        super.init();
+        this.configService.getConfiguration().then(({ dataDirUri }) => this.dataDirUri = new URI(dataDirUri));
+    }
+
+    getDecorations(title: Title<Widget>): WidgetDecoration.Data[] {
+        if (title.owner instanceof EditorWidget) {
+            const editor = title.owner.editor;
+            if (this.dataDirUri && this.dataDirUri.isEqualOrParent(editor.uri)) {
+                return [];
+            }
+        }
+        return super.getDecorations(title);
+    }
+
+}