refactor: Optimize file content retrieval

- Removed redundant getFileContent function from diffHandler
- Centralized getFileContent into commonUtil for shared usage
- Adjusted imports in devchat to reflect the new location

src/handler/diffHandler.ts

@@ -1,7 +1,5 @@
 import * as vscode from 'vscode';
 import * as path from 'path';
-import * as fs from 'fs';
-import * as util from 'util';
 
 import { createTempSubdirectory } from '../util/commonUtil';
 import { regInMessage, regOutMessage } from '../util/reg_messages';
@@ -9,7 +7,7 @@ import { applyCodeChanges, isValidActionString } from '../util/appyDiff';
 import { logger } from '../util/logger';
 import { FilePairManager } from '../util/diffFilePairs';
 import { UiUtilWrapper } from '../util/uiUtil';
-
+import { getFileContent } from '../util/commonUtil';
 
 
 async function getDocumentText(): Promise<{ text: string; beforSelect: string; select: string, afterSelect: string } | undefined> {
@@ -72,19 +70,6 @@ export async function diffView(code: string, tarFile: string) {
 	vscode.commands.executeCommand('vscode.diff', vscode.Uri.file(curFile), vscode.Uri.file(tempFile), 'Diff View');
 }
 
-export async function getFileContent(fileName: string): Promise<string | undefined> {
-	const readFile = util.promisify(fs.readFile);
-	try {
-		// Read file content from fileName
-		const fileContent = await readFile(fileName, 'utf-8');
-		// Return the whole text in the file with name fileName
-		return fileContent;
-	} catch (error) {
-		logger.channel()!.error(`Error reading the file ${fileName}:`, error);
-		return undefined;
-	}
-}
-
 async function getNewCode(message: any): Promise<string | undefined> {
 	let codeTextObj: { text: string; beforSelect: string; select: string; afterSelect: string; } | undefined = undefined;
 	if (message.fileName) {

src/toolwrapper/devchat.ts

@@ -6,7 +6,7 @@ import { CommandRun, saveModelSettings } from "../util/commonUtil";
 import { UiUtilWrapper } from '../util/uiUtil';
 import { ApiKeyManager } from '../util/apiKey';
 import { assertValue } from '../util/check';
-import { getFileContent } from '../handler/diffHandler';
+import { getFileContent } from '../util/commonUtil';
 
 
 const envPath = path.join(__dirname, '..', '.env');