This is really cool! Here's an example of using emacs to do it. Uses tabnine for real time completion, and Copilot/Codex for more advance completions.

https://semiosis.github.io/posts/nlsh-plus-tabnine-real-time...

It uses NLSH and Cterm. https://semiosis.github.io/nlsh/ https://semiosis.github.io/cterm/