Feature Request: bash/zsh completion implemented inside App

[yschimke]

As mentioned in #725, calling into the app can provide a lot richer completions.

I've implemented this myself in my own apps, but it's very specific code with caching, but with graal startup speeds it's probably possible to do a much simpler implementation.

[yschimke]

Feel free to close, this is a suggestion, I don't have plans to actively work on this.

[remkop]

Can you expand a bit on the "inside App"?

One idea is to have a command that generates the completion script (#456).
Another idea is to let the Bash completion script call the app itself to get completion candidates (#506) - this requires the Bash completion script to be able to invoke the command, so path, classpath etc. needs to be set up correctly.

Is this what you have in mind?

[yschimke]

#506 is exactly it. I think it’s a safe assumption if you can output as part of usage help a command name, that at completion time you can call that command and it should work. You can see how I do it for fish in the other issue I raised.