turn language status API proposal into push model, https://github.com/microsoft/vscode/issues/129037

src/vs/workbench/api/common/extHostLanguages.ts

@@ -7,7 +7,10 @@ import { MainContext, MainThreadLanguagesShape, IMainContext } from './extHost.p
 import type * as vscode from 'vscode';
 import { ExtHostDocuments } from 'vs/workbench/api/common/extHostDocuments';
 import * as typeConvert from 'vs/workbench/api/common/extHostTypeConverters';
-import { StandardTokenType, Range, Position } from 'vs/workbench/api/common/extHostTypes';
+import { StandardTokenType, Range, Position, LanguageStatusSeverity } from 'vs/workbench/api/common/extHostTypes';
+import Severity from 'vs/base/common/severity';
+import { disposableTimeout } from 'vs/base/common/async';
+import { IDisposable } from 'vs/base/common/lifecycle';
 
 export class ExtHostLanguages {
 
@@ -61,4 +64,69 @@ export class ExtHostLanguages {
 		}
 		return result;
 	}
+
+	private _handlePool: number = 0;
+
+	createLanguageStatusItem(selector: vscode.DocumentSelector): vscode.LanguageStatusItem {
+
+		const handle = this._handlePool++;
+		const proxy = this._proxy;
+
+		const data: { selector: any, text: string, detail: string | vscode.MarkdownString, severity: vscode.LanguageStatusSeverity } = {
+			selector,
+			text: '',
+			detail: '',
+			severity: LanguageStatusSeverity.Information,
+		};
+
+		let soonHandle: IDisposable | undefined;
+		const updateAsync = () => {
+			soonHandle?.dispose();
+			soonHandle = disposableTimeout(() => {
+				this._proxy.$setLanguageStatus(handle, {
+					selector: data.selector,
+					text: data.text,
+					message: typeof data.detail === 'string' ? data.detail : typeConvert.MarkdownString.from(data.detail),
+					severity: data.severity === LanguageStatusSeverity.Error ? Severity.Error : data.severity === LanguageStatusSeverity.Warning ? Severity.Warning : Severity.Info
+				});
+			}, 0);
+		};
+
+		const result: vscode.LanguageStatusItem = {
+			get selector() {
+				return data.selector;
+			},
+			set selector(value) {
+				data.selector = value;
+				updateAsync();
+			},
+			get text() {
+				return data.text;
+			},
+			set text(value) {
+				data.text = value;
+				updateAsync();
+			},
+			get detail() {
+				return data.detail;
+			},
+			set detail(value) {
+				data.detail = value;
+				updateAsync();
+			},
+			get severity() {
+				return data.severity;
+			},
+			set severity(value) {
+				data.severity = value;
+				updateAsync();
+			},
+			dispose() {
+				soonHandle?.dispose();
+				proxy.$removeLanguageStatus(handle);
+			}
+		};
+		updateAsync();
+		return result;
+	}
 }