add rad completion bash to generate a bash completion file.

Overall, it’s good. But there are some documentation issues — it could be made a bit better and easier.

fix missing complete statement at the end of the generated output

automated sub-command and sub-sub-command discovery

rebased on master

This would be completely unnecessary if we finally get the shift to clap merged. I’d love to rather see the clap patches be merged rather than more code for CLI stuff be added.

Thanks for the contribution @flepied! As @matthiasbeyer points out, I think we would rather leverage clap to achieve this.

That work is going to be continued now, and we hope to have it merged and released within the next month.

I’ll leave this patch open for now, but we’ll likely archive it in favour of using the clap generation instead :)

rebased on master

rebased