[Feature Request] Completion? about cyclopts HOT 6 OPEN

I'm still thinking about this; I'm actually leaning towards the argparse solution (and maybe even also having a to_click method later) where I map postional-or-keyword arguments to be position-only to make them more compatible with those libraries/ecosystems.

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I would love to add autocompletion, but have no experience in the area. I would certainly welcome any input, whether it be general recommendations, library suggestions, PRs, etc.

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Just a heads up, I am working on this, hoping to have something testable in the next week or two.

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shell completion is infinitely more complex than I was initially expecting 😄 . Still a WIP.

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This is somewhat of a deal breaker for me so I'm keen to help out to add this feature!

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Currently I'm working on adding bash and zsh support; i'm taking another direction on it and going to be basing the code off of shtab's implementation, which I think is a good reference.

Originally I was pursuing the idea of adding functionality to generate an argparse.ArgumentParser object from a cyclopts.App. However, some Cyclopts concepts don't directly translate (such as positional-or-keyword arguments). The benefits of this approach is that other off-the-shelf tooling could be used. I'm still considering this approach, but it does have its issues.

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