Improve command discovery and welcome messages

t6/scripts/tws_t6_common.gsc

@@ -153,11 +153,46 @@ help_chat_listener()
             continue;
 
         command = toLower(message);
-        if (command == ".help" || command == ".commands")
+        if (command == ".help" || command == ".commands" || command == ".info" || command == ".command")
             player show_help();
+        else if (help_unknown_command(command))
+            player iPrintLn("Unknown command. Type .help for the list");
     }
 }
 
+// Compare command tokens, not help labels containing argument syntax.
+help_first_word(message)
+{
+    words = strTok(toLower(message), " \t\r\n");
+    if (words.size == 0)
+        return "";
+    return words[0];
+}
+
+help_unknown_command(message)
+{
+    if (message.size == 0)
+        return false;
+    prefix = getSubStr(message, 0, 1);
+    if (prefix != "." && prefix != "!")
+        return false;
+
+    command = help_first_word(message);
+    if (command == ".help" || command == ".commands" || command == ".info" || command == ".command")
+        return false;
+    if (isDefined(level.tws_help_commands))
+    {
+        for (i = 0; i < level.tws_help_commands.size; i++)
+        {
+            registered = help_first_word(level.tws_help_commands[i].command);
+            // The record alias is available when the leaderboard registers itself.
+            if (command == registered || (command == ".record" && registered == ".leaders"))
+                return false;
+        }
+    }
+    return true;
+}
+
 // A single per-player controller owns service priority, pages and expiry.
 show_help()
 {