Challenge anyone about slack-pongbot HOT 5 OPEN

I took a stab at this a while ago, but I think the flow could be better.

9bec877

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I think it should work like this: pongbot challenge singles (it can't be pongbot challenge singles anyone because someone could be named anyone :), which creates a Challenge without any challenged opponents, then when you pongbot accept you become either the opponent or a teammate for doubles. Codewise it means looking for one such open challenge when you accept.

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That sounds good to me. I like the dual use of the challenge command.

pongbot challenge singles
pongbot challenge doubles

I think there should just only be one open challenge, it could get confusing. So joining one would just be whatever current open challenge there is. And then trying to create another open challenge would just remind you that there's one already.

I feel like an open challenge should expire over time though, just in case someone created one but no one joined ( 😢 ) and it got left overnight.

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👍

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I think generally there's no reason to have long lived challenges that aren't accepted, opened #53.

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