unexist.dev

Oh my goodness! I completely forgot to post it here: half a year
ago I wrote completion files for subtle, subtler and sur for Zsh
and Bash. Note, that Bash completion is missing completion for
subtler (cba to write it, since I'm not a Bash user).

Here you go:

https://github.com/kyrylo/bash-completion-subtle

https://github.com/kyrylo/zsh-completion-subtle

Arch users can install a package for Zsh from AUR:

https://aur.archlinux.org/packages.php?ID=54047