Allow move/purge commands to take a message id as argument, instead of number of messages

[tehhowch]

Counting is dumb. And error-prone. Instead, James should find the message referenced, and operate on the messages between then and the command

[tehhowch]

I'm gonna have to put my Java hat back on aren't i

[MCOfficer]

possibly. i planned on migrating to JDA4 soon, so if you ask nicely, this looks doable. i just need motivation..

[tehhowch]

would it make sense to provide named arguments too, e.g. these could both be valid:

-move <channel> --after=<messageId> --until=<messageId>
-move <channel> <count> --after=<messageId>

I'd need to investigate the arg parsing a bit but it seems not difficult and possibly easier for mods

[MCOfficer]

i tried to get by without unix-style arguments so far, because they seem to be unintuitive for non-linux users. in this case, you can still use positional arguments and infer their meaning from context, though that may be pretty confusing, too.

the simple alternative is to simply make command aliases, e.g. -moverange, -moveafter, etc.