auto completion with tab: separate commands and tree structure

[Reto]

On Fri, Mar 27, 2020 at 04:44:11PM +0100, Reed Wade wrote:
> The second only available option would allow the script to only show "commands"
> first available arguments (list, show, etc) and show the tree as second
> argument, depending on the cursor position.

That's a bad thing to do in my view.
I frequently use pass in an interactive fashion, not having to type "show" is
a feature and not a bug. I very much *want* the passwords to complete by typing
`pass $partial<TAB>`