Add simple backend logging service (#1517)

* formatting

* inefficient import

* remove redundant initialization check

src/extension.ts

@@ -3,6 +3,7 @@
 import delay from "delay"
 import * as vscode from "vscode"
 import { ClineProvider } from "./core/webview/ClineProvider"
+import { Logger } from "./services/logging/Logger"
 import { createClineAPI } from "./exports"
 import "./utils/path" // necessary to have access to String.prototype.toPosix
 import { DIFF_VIEW_URI_SCHEME } from "./integrations/editor/DiffViewProvider"
@@ -24,7 +25,8 @@ export function activate(context: vscode.ExtensionContext) {
 	outputChannel = vscode.window.createOutputChannel("Cline")
 	context.subscriptions.push(outputChannel)
 
-	outputChannel.appendLine("Cline extension activated")
+	Logger.initialize(outputChannel)
+	Logger.log("Cline extension activated")
 
 	const sidebarProvider = new ClineProvider(context, outputChannel)
 
@@ -36,7 +38,7 @@ export function activate(context: vscode.ExtensionContext) {
 
 	context.subscriptions.push(
 		vscode.commands.registerCommand("cline.plusButtonClicked", async () => {
-			outputChannel.appendLine("Plus button Clicked")
+			Logger.log("Plus button Clicked")
 			await sidebarProvider.clearTask()
 			await sidebarProvider.postStateToWebview()
 			await sidebarProvider.postMessageToWebview({
@@ -56,7 +58,7 @@ export function activate(context: vscode.ExtensionContext) {
 	)
 
 	const openClineInNewTab = async () => {
-		outputChannel.appendLine("Opening Cline in new tab")
+		Logger.log("Opening Cline in new tab")
 		// (this example uses webviewProvider activation event which is necessary to deserialize cached webview, but since we use retainContextWhenHidden, we don't need to use that event)
 		// https://github.com/microsoft/vscode-extension-samples/blob/main/webview-sample/src/extension.ts
 		const tabProvider = new ClineProvider(context, outputChannel)
@@ -186,5 +188,5 @@ export function activate(context: vscode.ExtensionContext) {
 
 // This method is called when your extension is deactivated
 export function deactivate() {
-	outputChannel.appendLine("Cline extension deactivated")
+	Logger.log("Cline extension deactivated")
 }

src/services/logging/Logger.ts

@@ -0,0 +1,18 @@
+import type { OutputChannel } from "vscode"
+
+/**
+ * Simple logging utility for the extension's backend code.
+ * Uses VS Code's OutputChannel which must be initialized from extension.ts
+ * to ensure proper registration with the extension context.
+ */
+export class Logger {
+	private static outputChannel: OutputChannel
+
+	static initialize(outputChannel: OutputChannel) {
+		Logger.outputChannel = outputChannel
+	}
+
+	static log(message: string) {
+		Logger.outputChannel.appendLine(message)
+	}
+}