Re: [Help-bash] Why bash does not recoganize array type smartly?

[Greg Wooledge]

On Wed, Mar 16, 2016 at 06:40:32PM +0000, Dan Douglas wrote:
> That's basically what my current solution is. I heard zsh has a
> pre-command variable that would be much better but I still need some
> ugly hacks to make it work.

Bash 4.4-rc1 also has this:

c.  New prompt string: PS0.  Expanded and displayed by interactive shells after
    reading a complete command but before executing it.

I haven't tested it, but I'm assuming you can put command substitutions
in it, if you're into that.