catch invalid command

index.mjs

@@ -6,6 +6,10 @@ var bot = new Bot({
 	emitEvents: false,
 	emitChatEvents: true
 });
+bot.on("error", error => {
+	console.error("bot error", error);
+});
+
 await bot.login({
 	identifier: process.env.IDENTIFIER,
 	password: process.env.PASSWORD
@@ -22,7 +26,11 @@ bot.on("message", async message => {
 		if (message.text.startsWith('/')) {
 			let respond = text => conversation.sendMessage({text});
 			let cmd = message.text.split(' ')[0].slice(1).toLowerCase();
+			let commandList = `/list, /leave, /join, /ping`;
 			switch(cmd) {
+				case "ping":
+					await respond("pong");
+					return;
 				case "list":
 					let {conversations} = await bot.listConversations();
 					await respond(`${conversations.length} members in group chat: ${conversations.map(c => '@' + c.members.find(m => m.did != bot.profile.did).handle).join(', ')}`);
@@ -32,13 +40,13 @@ bot.on("message", async message => {
 					await conversation.leave();
 					return;
 				case "join": 
-					await respond(`Welcome to the group chat!`);
-					return;
-				case "ping":
-					await respond("pong");
+					await respond(`You joined the group chat`);
 					return;
 				case "help":
-					await respond(`Commands: /list, /leave, /join, /ping`);
+					await respond(`Commands: ${commandList}`);
+					return;
+				default:
+					await respond(`Only these commands are accepted: ${commandList}`);
 					return;
 			}
 		}