[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: cmdline.ss library in PLT

This page is part of the web mail archives of SRFI 37 from before July 7th, 2015. The new archives for SRFI 37 contain all messages, not just those from before July 7th, 2015.

I have briefly reviewed the cmdline.ss documentation. Let me say up front
that there are a lot of ways to this job, and I doubt any way is perfect.
My goal with args-fold was to provide a useful, generic, and flexible
interface to the Posix/GNU guidelines in "the spirit of Scheme".
Arguments could be made about my design choices from two directions: about
the programmer's interface, about the user's interface.

Here are my notes about cmdline.ss:

1. Cmdline seems to have a mandatory builtin help system. In args-fold, a
help option in handled by the programmer like any other option.

2. Cmdline seems to support more than one argument per option. Args-fold
supports 0 or 1 arguments per option, following the lead of POSIX/GNU

3. At first, I thought it would be possible to implement cmdline in terms
of args-fold, but I believe the cmdline interface requires a
"procedure-arity" implementation. This is a clever trick that takes
advantage plt-scheme, but I think it also prevents cmdline from being
implemented on most other Scheme systems.

 -Anthony Carrico