Activate linter in extension.

Author: edsgerlin

src/extension.ts

@@ -2,11 +2,14 @@
 // Import the module and reference it with the alias vscode in your code below
 import { DocumentFilter, ExtensionContext, languages } from "vscode";
 import { PerlFormattingProvider } from "./format";
+import { PerlLinterProvider } from "./linter";
 // this method is called when your extension is activated
 // your extension is activated the very first time the command is executed
 export async function activate(context: ExtensionContext) {
     console.log("simple-perl has been activated.");
     const selector: DocumentFilter = { language: "perl", scheme: "file" };
     const formatProvider = new PerlFormattingProvider();
     context.subscriptions.push(languages.registerDocumentRangeFormattingEditProvider(selector, formatProvider));
+    const linterProvider = new PerlLinterProvider();
+    linterProvider.activate(context.subscriptions);
 }

src/linter.ts

@@ -9,25 +9,18 @@ import {
     languages, Range, TextDocument, workspace, WorkspaceConfiguration,
 } from "vscode";
 
-export default class PerlLinterProvider {
+export class PerlLinterProvider {
     private diagnosticCollection: DiagnosticCollection;
     private configuration: WorkspaceConfiguration;
 
-    public constructor(subscriptions: Disposable[]) {
+    public constructor() {
         this.diagnosticCollection = languages.createDiagnosticCollection();
         this.configuration = workspace.getConfiguration("simple-perl");
+    }
 
-        workspace.onDidCloseTextDocument(
-            (textDocument) => {
-                this.diagnosticCollection.delete(textDocument.uri);
-            },
-            null,
-            subscriptions,
-        );
-
+    public activate(subscriptions: Disposable[]): void {
         workspace.onDidOpenTextDocument(this.lint, this, subscriptions);
         workspace.onDidSaveTextDocument(this.lint, this);
-
         workspace.onDidCloseTextDocument(
             (textDocument) => {
                 this.diagnosticCollection.delete(textDocument.uri);