Automatically expose cogs as globals in python eval about jishaku HOT 3 CLOSED

_bot.cogs['MyCog'] is a bit quicker to type. combine that with setting jishaku retain on by default using environment variables and it's not so bad. This also gets into the sticky issue of maintaining that state whenever a cog is reloaded. Potentially that could be solved by passing a custom globals dictionary type to exec that falls back to looking up bot.cogs.

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I don't really like having this be done by the repl context preparation because it would mean people who use JISHAKU_NO_UNDERSCORE would end up having all their cogs in scope randomly, and since I've seen a decent number of people call their cogs things like Fun and Games I can forsee scoping issues. It would actually be pretty funny to see people be bitten by this, since it would mean people would stop asking me why I prefix the underscore by default.

A potential compromise might be to just add _cogs as an automatic variable, but even that might cause scoping issues (I know many people, including myself, who put their cogs into a cogs.whatever module).

I don't really like the idea of a global fallback dictionary because it means people unfamiliar with the behavior won't know why they have magic ephemeral variables flying around. It's easy to tell that _bot.cogs['Utils'].something() won't work for you if you don't have such a cog, but _Utils.something() is more confusing at a glance.

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I think I'm ultimately deciding to not do this one. You can trivially use _bot.get_cog to get this behavior with not really that much brevity loss, and without the expense of having potentially conflicting or confusing automatic names in scope.

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