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In zsh you can use the _gnu_generic function for simple completion of commands with a --help flag. Just put a line like this somewhere in your startup file: compdef _gnu_generic <CMD>

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_gnu_generic is fantastic. I use it all the time. If your CLI toolkit emits colorized help, but skips said colorization if NO_COLOR[1] is set then you can prefix _gnu_generic with NO_COLOR=1 as in https://github.com/c-blake/cligen/wiki/Zsh-completion-for-cl... for the cligen Nim CLI toolkit.

A similar thing in Bash is `complete -F _longopt YourCmd`, but these will not work with "multi-commands" that have "sub-commands" as the article of this thread covers. Truth is, as non-standard as GNU long opts already are, how subcommands work is even more non-standard (are there even global options? Or between each subcommand? Is it how Python does it? Or Go? Or some one specific library or ..?)

[^1]: https://no-color.org/

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