[keepamovin]

Thanks for that. I'm currently migrating a set of bash scripts to PS1 for win compatibility. This is gonna help me! Undeniably a good feature. Sure there's the case / getopts idiom for parsing args in bash as you say, but I'd say this is a place PS excels them in. I totally agree that arg parsing should be standardized and simple like this. A nice CLI is just such a joy to use. Ideally something that includes usage info and (like the PS example seemingly) optionality.

Syntactically I'd even prefer a single line, like

  [Pram(musthave):In(1, 20)/"Foos excessive or inadequate":int/$foo:"Foo count"/"Please supply how many foos you want."]