Implement function to execute VSCode commands

- Added a new function 'doCommand' in 'doCommand.ts' to execute VSCode commands.
- The function takes a message and a panel as arguments, and uses the 'executeCommand' method from the 'vscode' module.
- Updated 'commandManager.ts' to return an empty string instead of undefined.
- Registered the new 'doCommand' handler in 'loadHandlers.ts'.

src/command/commandManager.ts

@@ -23,7 +23,7 @@ class CommandManager {
 				description: 'ask code',
 				args: 0,
 				handler: async (commandName: string, userInput: string) => {
-					return;
+					return '';
 				}
 			});
 		}

src/handler/doCommand.ts

@@ -0,0 +1,21 @@
+/*
+execute vscode command
+*/
+
+import * as vscode from 'vscode';
+import DtmWrapper from '../toolwrapper/dtm';
+import { regInMessage, regOutMessage } from '../util/reg_messages';
+import { runCommandAndWriteOutput } from '../util/commonUtil';
+
+regInMessage({command: 'doCommand', content: ['command', 'arg1', 'arg2']});
+export async function doCommand(message: any, panel: vscode.WebviewPanel|vscode.WebviewView): Promise<void> {
+    // execute vscode command
+    // message.content[0]: vscode command
+    // message.content[1:]: args for command
+    try {
+        await vscode.commands.executeCommand(message.content[0], ...message.content.slice(1));
+    } catch (error) {
+        console.error(`Failed to execute command ${message.content[0]}: ${error}`);
+    }
+    return;
+}

src/handler/loadHandlers.ts

@@ -15,6 +15,7 @@ import { contextDetail } from './contextDetail';
 import { listAllMessages } from './listMessages';
 import { regActionList } from './regActionList';
 import { applyAction } from './applyAction';
+import { doCommand } from './doCommand';
 
 
 // According to the context menu selected by the user, add the corresponding context file
@@ -78,3 +79,6 @@ messageHandler.registerHandler('applyAction', applyAction);
 messageHandler.registerHandler('deleteChatMessage', deleteChatMessage);
 
 messageHandler.registerHandler('askCode', askCode);
+// Execute vscode command
+// Response: none
+messageHandler.registerHandler('doCommand', doCommand);