My command is in a seperate class and are registered in another class.

I want to make a command that goes about like this:

/modid commandname [argument]

 

I also want the commandname to be in the autocomplete, so i use:

public static ArgumentBuilder<CommandSource, ?> register(CommandDispatcher<CommandSource> dispatcher) {
	return Commands.literal("commandname")
		.requires(cs -> cs.hasPermissionLevel(0))
		.executes(CMD);
}

CMD is a private static final Instance of the class of the Command.

 

How can I get [argument]? Thank you in advance for any tips.

Check ArgumentBuilder#then, and vanilla commands.