Adds an event bus to the container

src/container.ts

@@ -11,6 +11,7 @@ import type { ToggleFileAnnotationCommandArgs } from './commands';
 import type { FileAnnotationType, ModeConfig } from './configuration';
 import { AnnotationsToggleMode, configuration, DateSource, DateStyle } from './configuration';
 import { Commands } from './constants';
+import { EventBus } from './eventBus';
 import { GitFileSystemProvider } from './git/fsProvider';
 import { GitProviderService } from './git/gitProviderService';
 import { GitHubAuthenticationProvider } from './git/remotes/github';
@@ -180,6 +181,7 @@ export class Container {
 		context.subscriptions.push((this._lineTracker = new GitLineTracker(this)));
 		context.subscriptions.push((this._keyboard = new Keyboard()));
 		context.subscriptions.push((this._vsls = new VslsController(this)));
+		context.subscriptions.push((this._eventBus = new EventBus()));
 
 		context.subscriptions.push((this._fileAnnotationController = new FileAnnotationController(this)));
 		context.subscriptions.push((this._lineAnnotationController = new LineAnnotationController(this)));
@@ -343,6 +345,11 @@ export class Container {
 		return 'production';
 	}
 
+	private _eventBus: EventBus;
+	get events() {
+		return this._eventBus;
+	}
+
 	private _fileAnnotationController: FileAnnotationController;
 	get fileAnnotations() {
 		return this._fileAnnotationController;

src/eventBus.ts

@@ -0,0 +1,47 @@
+import type { Disposable } from 'vscode';
+import { EventEmitter } from 'vscode';
+
+export type EventBusPackage = {
+	name: string;
+	data?: unknown;
+	source?: string;
+};
+
+export type EventBusOptions = {
+	source?: string;
+};
+
+export class EventBus implements Disposable {
+	private _emitter: EventEmitter<EventBusPackage>;
+
+	constructor() {
+		this._emitter = new EventEmitter();
+	}
+
+	private get event() {
+		return this._emitter.event;
+	}
+
+	on(eventName: string, handler: (e: EventBusPackage) => void, thisArgs?: any, disposables?: Disposable[]) {
+		return this.event(
+			e => {
+				if (eventName !== e.name) return;
+				handler.call(thisArgs, e);
+			},
+			thisArgs,
+			disposables,
+		);
+	}
+
+	fire(name: string, data?: unknown, options?: EventBusOptions) {
+		this._emitter.fire({
+			name: name,
+			data: data,
+			source: options?.source,
+		});
+	}
+
+	dispose() {
+		this._emitter?.dispose();
+	}
+}