Added a debouncer function to delay the constant firing of "UPDATE_XML" command on cursor movement

Author: yaad96

src/Constants.ts

@@ -9,6 +9,6 @@ export const Constants = {
     SRCML_PATH_WINDOWS: "C:\\Program Files\\srcML 0.9.5\\bin\\srcml",
     SRCML_PATH_MAC: "/usr/local/bin/srcml",
     SRCML_PATH_LINUX: "/usr/bin/srcml",
-    JUST_FOR_THE_KICKS:"hello"
+    DEBOUNCER_DELAY:3000
 
 };

src/FileChangeManager.ts

@@ -6,7 +6,8 @@ import * as fs from 'fs';
 import * as path from 'path';
 import { readFile } from 'fs/promises';
 import { WebSocketConstants } from './WebSocketConstants';
-import { buildFolderHierarchy } from './utilites';
+import { Constants } from './Constants';
+import { buildFolderHierarchy,debounce } from './utilites';
 //import { MessageProcessor } from './MessageProcessor';
 import { FollowAndAuthorRulesProcessor } from './FollowAndAuthorRulesProcessor';
 import { MiningRulesProcessor } from './MiningRulesProcessor';
@@ -23,6 +24,8 @@ export class FileChangeManager {
     private constructor(projectPath:string,ws:WebSocket) {
         this.projectPath = projectPath;
         this.ws = ws;
+        //second argument to the debounce function sets the delay timer
+        this.debouncedHandleChangeTextDocument = debounce(this.handleChangeTextDocument.bind(this), Constants.DEBOUNCER_DELAY);
         this.watchWorkspaceChanges();
         if (vscode.workspace.workspaceFolders) {
             //const projectPath = vscode.workspace.workspaceFolders[0].uri.fsPath;
@@ -109,13 +112,14 @@ export class FileChangeManager {
         return FileChangeManager.instance;
     }
 
+    private debouncedHandleChangeTextDocument: (event: vscode.TextDocumentChangeEvent) => void;
 
 
     private watchWorkspaceChanges() {
 
         this.handleActiveTextEditorChange();
 
-        vscode.workspace.onDidChangeTextDocument(this.handleChangeTextDocument.bind(this));
+        vscode.workspace.onDidChangeTextDocument(this.debouncedHandleChangeTextDocument);
         vscode.workspace.onDidCreateFiles(this.handleCreateFile.bind(this));
         vscode.workspace.onDidDeleteFiles(this.handleDeleteFile.bind(this));
         vscode.workspace.onDidRenameFiles(this.handleRenameFile.bind(this));

src/utilites.ts

@@ -7,6 +7,18 @@ import * as os from 'os';
 import * as fs from 'fs';
 
 
+export function debounce<T extends (...args: any[]) => void>(func: T, wait: number): (...args: Parameters<T>) => void {
+  let timeout: NodeJS.Timeout | null;
+  return function (...args: Parameters<T>) {
+    if (timeout) {
+      clearTimeout(timeout);
+    }
+    timeout = setTimeout(() => {
+      func(...args);
+    }, wait);
+  };
+}
+
 
 
 export async function writeToFile(filePath: string, exprText: string): Promise<void> {