!purge should take an optional set of channels, for mass-purging multi-channel spam.

[lemonsaurus]

some people will spam several channels. Let's make all !purge commands default to current channel only, but optionally take a list of channels to purge.

[wookie184]

An option to clear messages from all channels would also be helpful, so if somebody joins just to spam in a ton of channels we can easily clear it without having to specify all channels individually.

[jb3]

Only issue I foresee with multiple channels is that we need to fetch history from multiple channels or store a cache or the last X messages, though I agree it would be useful.

[lemonsaurus]

@wookie184 I don't see how this would work. We have 100+ channels, how is it supposed to know which ones you want? Are you gonna delete messages from log channels, announcements, staff channels? Do we have to maintain a list of which channels we should purge from?

I think just specifying them is fine for now.

[wookie184]

@lemonsaurus That makes sense, I didn't really think that through fully.
Maybe accepting category names/ IDs as well as channels to allow for clearing from, for example, all topical channels would be possible, but I also agree that just channel names is fine for now, definitely much better than what we had before.

[lemonsaurus]

Accepting category IDs wouldn't be too bad, I agree. I don't think I'm gonna do it in #974 though.