Bash/ZSH can have arbitary completion functions/scripts that receive the full input. A lot of the completions are auto-generated from man files, which don't co

Bash/ZSH can have arbitary completion functions/scripts that receive the full input. A lot of the completions are auto-generated from man files, which don't contain information like "argument x is only available if argument y is present", etc. (at least in a structured way) It's "just" a matter of implementing completions manually to enable what you are asking for.