know decorations using command links, #29076

src/vs/workbench/api/node/extHostExtensionService.ts

@@ -19,6 +19,7 @@ import { Barrier } from 'vs/workbench/services/extensions/node/barrier';
 import { ExtHostThreadService } from 'vs/workbench/services/thread/node/extHostThreadService';
 import { realpath } from 'fs';
 import { TrieMap } from 'vs/base/common/map';
+import { V8CallSite } from 'vs/base/common/errors';
 
 class ExtensionMemento implements IExtensionMemento {
 
@@ -227,6 +228,27 @@ export class ExtHostExtensionService implements ExtHostExtensionServiceShape {
 		return this._extensionPathIndex;
 	}
 
+	public getActiveExtensionFromCallstack(): TPromise<IExtensionDescription> {
+		const err = new Error();
+		return this.getExtensionPathIndex().then(index => {
+			let oldHandler = (<any>Error).prepareStackTrace;
+			let result: IExtensionDescription;
+			(<any>Error).prepareStackTrace = (err: Error, stacktrace: V8CallSite[]) => {
+				for (const call of stacktrace) {
+					result = index.findSubstr(call.getFileName());
+					if (result) {
+						return;
+					}
+				}
+			};
+
+			// tslint:disable-next-line:no-unused-expression
+			err.stack;
+
+			(<any>Error).prepareStackTrace = oldHandler;
+			return result;
+		});
+	}
 
 	public deactivate(extensionId: string): TPromise<void> {
 		let result: TPromise<void> = TPromise.as(void 0);