I did come across this work by clap while doing research for this post. The major difference in strategy is that clap is generating completion scripts in Bash, while shell_completion is a library which helps writing completion scripts in Rust. I think one exciting bit of future potential for shell_completion is it could potentially allow building something like what clap has done using the standard Rust macro system.

In any event, thanks for bringing this up.

I actually wrote a library that generates completions for both zsh and bash for the Ruby Thor CLI library. https://github.com/snowe2010/fylla/

This could be useful in research to make it work for clap.

I wrote two articles that kind of highlight the differences in completions between the two, but only in regards to subcommands, since that's what I was trying to cover.

https://tylerthrailkill.com/2019-01-19/writing-bash-completi... https://tylerthrailkill.com/2019-01-13/writing-zsh-completio...