Do you mean a terminal-based editor, like emacs, vim, neovim, or helix? (I quite like the latter, after having used all the former to some degree.)

Or do you mean line-editors? They have gotten impressively good. See rustyline (based on linenoise) and reedline (not a typo; developed by the Nushell team) for example. Way better than one might expect!

[1]: https://github.com/kkawakam/rustyline

[2]: https://github.com/antirez/linenoise

[3]: https://github.com/nushell/reedline