zsh completion helper script for taskopen
I'm a recent convert to zsh, and I now understand how all of those taskwarrior helper-scrpts actually help, by providing zsh (and others) with completion options. 

I wonder if an _openable script, re-written on every "write-to-data-file" action,  might generate such a list of the things that taskopen actually knows how to open, so then at the CLI, "taskopen 142<tab><tab>" could show all of the logical completions.
