It is not an either-or situation. Here is an alternative run where I combined
case-lambda with command-line:
> $ ./manage hello -t world -d good
> (the-mandatory-argument: hello #t)
> (-t #f)
> (-d good)
> (files: ())
The script is this now:
#! /bin/sh
#|
exec racket -tm "$0" ${1+"$@"}
|#
#lang racket
(provide
main)
(define main
(case-lambda
[(the-mandatory-argument . others)
(displayln
`(the-mandatory-argument:
,the-mandatory-argument
,(string? the-mandatory-argument)))
(command-line
#:program "manage"
#:argv others
#:usage-help "\n Copy <files> at a limited rate"
#:once-each
[("-t") time "the duration of <time> in seconds between each copy;
default: 5"
(displayln `(-t ,(string->number time)))]
[("-d") dest "the directory to which <files> will be copied; default: ."
(displayln `(-d ,dest))]
#:args files
(displayln `(files: ,files)))]
[() (displayln '(help me make it through the night))]))
> On Nov 13, 2015, at 11:10 PM, Christopher Walborn <tuir...@gmail.com> wrote:
>
> Oh, interesting. There's several new things in there for me to explore. Thank
> you. (And nice Beatles reference.)
>
> If you don't mind explaining -- what are the trade-offs between this approach
> and using the arg parsing features of racket/cmdline?
>
> Thanks,
> Christopher
>
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