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Description
It would be nice to allow users to register callbacks for completing a command. This would allow them to keep the normal completion logic we have while getting custom stuff for completing e.g. git. It would also save people from needing to redundantly implement parsing logic, etc. I'm thinking something like: https://elv.sh/ref/edit.html#argument-completer
It would probably be best to wait to do this until after janet-lang/janet#121 is implemented, but I thought I'd go ahead and open an issue.