scm: keep `scmProvider` context key

src/vs/workbench/parts/scm/electron-browser/scmActivity.ts

@@ -12,6 +12,7 @@ import { VIEWLET_ID } from 'vs/workbench/parts/scm/common/scm';
 import { ISCMService, ISCMRepository } from 'vs/workbench/services/scm/common/scm';
 import { IActivityBarService, NumberBadge } from 'vs/workbench/services/activity/common/activityBarService';
 import { IWorkbenchContribution } from 'vs/workbench/common/contributions';
+import { IContextKeyService, IContextKey } from 'vs/platform/contextkey/common/contextkey';
 import { IStatusbarService, StatusbarAlignment as MainThreadStatusBarAlignment } from 'vs/platform/statusbar/common/statusbar';
 
 export class StatusUpdater implements IWorkbenchContribution {
@@ -75,12 +76,16 @@ export class StatusBarController implements IWorkbenchContribution {
 
 	private statusBarDisposable: IDisposable = EmptyDisposable;
 	private focusDisposable: IDisposable = EmptyDisposable;
+	private focusedRepository: ISCMRepository | undefined = undefined;
+	private focusedProviderContextKey: IContextKey<string | undefined>;
 	private disposables: IDisposable[] = [];
 
 	constructor(
 		@ISCMService private scmService: ISCMService,
-		@IStatusbarService private statusbarService: IStatusbarService
+		@IStatusbarService private statusbarService: IStatusbarService,
+		@IContextKeyService contextKeyService: IContextKeyService
 	) {
+		this.focusedProviderContextKey = contextKeyService.createKey<string | undefined>('scmProvider', void 0);
 		this.scmService.onDidAddRepository(this.onDidAddRepository, this, this.disposables);
 
 		if (this.scmService.repositories.length > 0) {
@@ -98,6 +103,12 @@ export class StatusBarController implements IWorkbenchContribution {
 		const removeDisposable = onDidRemove(() => {
 			disposable.dispose();
 			this.disposables = this.disposables.filter(d => d !== removeDisposable);
+
+			if (this.scmService.repositories.length === 0) {
+				this.focusedProviderContextKey.set(undefined);
+			} else if (this.focusedRepository === repository) {
+				this.scmService.repositories[0].focus();
+			}
 		});
 
 		const disposable = combinedDisposable([changeDisposable, removeDisposable]);
@@ -109,6 +120,11 @@ export class StatusBarController implements IWorkbenchContribution {
 	}
 
 	private onDidFocusRepository(repository: ISCMRepository): void {
+		if (this.focusedRepository !== repository) {
+			this.focusedRepository = repository;
+			this.focusedProviderContextKey.set(repository.provider.id);
+		}
+
 		this.focusDisposable.dispose();
 		this.focusDisposable = repository.provider.onDidChange(() => this.render(repository));
 		this.render(repository);