handle chat commands better

in preparation for other commands such as for resyncing

frontend/lib/chat.mjs

@@ -12,17 +12,36 @@ const setupChatboxEvents = (socket) => {
     if (content.trim().length) {
       input.value = "";
 
-      if (
-        content.toLowerCase() == "/ping" ||
-        content.toLowerCase().startsWith("/ping ")
-      ) {
+      // handle commands
+      if (content.startsWith("/")) {
+        const command = content.toLowerCase().match(/^\/\S+/)[0];
+        const args = content.slice(command.length).trim();
+
+        let handled = false;
+        switch (command) {
+          case "/ping":
             socket.send(
               JSON.stringify({
                 op: "Ping",
-            data: content.slice(5).trim(),
+                data: args,
               })
             );
-      } else {
+            handled = true;
+            break;
+          case "/help":
+            // TODO: print help in chat
+            handled = true;
+            break;
+          default:
+            break;
+        }
+
+        if (handled) {
+          return;
+        }
+      }
+
+      // handle regular chat messages
       socket.send(
         JSON.stringify({
           op: "ChatMessage",
@@ -30,7 +49,6 @@ const setupChatboxEvents = (socket) => {
         })
       );
     }
-    }
   });
 };