bash-completion already does that, and it works OK, but is limited. It's used on most Linux distros, so you've likely already used that code path. It actually

bash-completion already does that, and it works OK, but is limited. It's used on most Linux distros, so you've likely already used that code path. It actually invokes --help dynamically you hit `<TAB>` and parses the output dynamically. Whereas other systems do it offline in a batch job, e.g. some fish completions.