Oh also, my feeling of why this may be interesting is if you think "I want to write a GUI for shell, but I can't modify the bash source code to do what I want"

Oh also, my feeling of why this may be interesting is if you think "I want to write a GUI for shell, but I can't modify the bash source code to do what I want" That is, the shell itself is a limitation OSH is the most bash-compatible shell by a mile, AND we can easily add new hooks and so forth. I think most stuff can be already done with FANOS, but I think completion is one area that needs some testing / feedback. For example, I imagine that when constructing a pipeline, you might want to complete exactly what's available -- like shell functions that the user has defined ?