I wrote long ago about writing competion scripts in any language: https://saveriomiroddi.github.io/Using-scripts-in-any-language-for-bash-zsh-tab-completion htt

I wrote long ago about writing competion scripts in any language: https://saveriomiroddi.github.io/Using-scripts-in-any-language-for-bash-zsh-tab-completion https://saveriomiroddi.github.io/Using-scripts-in-any-langua.... Although it's not ideal (one ends up duplicating the arguments parsing logic of the program), it's actually not complicated, just some boilerplate.