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;;; "getopt.scm" POSIX command argument processing
;Copyright (C) 1993, 1994, 2002 Aubrey Jaffer
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, and to use it for any purpose is
;granted, subject to the following restrictions and understandings.
;1. Any copy made of this software must include this copyright notice
;in full.
;2. I have made no warranty or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(define getopt:scan #f)
(define getopt:char #\-)
(define getopt:opt #f)
;;(define *argv* *argv*)
(define *optind* 1)
(define *optarg* 0)
(define (getopt optstring)
(let ((opts (string->list optstring))
(place #f)
(arg #f)
(argref (lambda () ((if (vector? *argv*) vector-ref list-ref)
*argv* *optind*))))
(cond ((and getopt:scan (not (string=? "" getopt:scan))) #t)
((>= *optind* (length *argv*)) #f)
(set! arg (argref))
(cond ((or (<= (string-length arg) 1)
(not (char=? (string-ref arg 0) getopt:char)))
((and (= (string-length arg) 2)
(char=? (string-ref arg 1) getopt:char))
(set! *optind* (+ *optind* 1))
(set! getopt:scan (substring arg 1 (string-length arg)))
(set! getopt:opt (string-ref getopt:scan 0))
(set! getopt:scan
(substring getopt:scan 1 (string-length getopt:scan)))
(if (string=? "" getopt:scan) (set! *optind* (+ *optind* 1)))
(set! place (member getopt:opt opts))
(cond ((not place) #\?)
((or (null? (cdr place)) (not (char=? #\: (cadr place))))
(set! *optarg* #t)
((not (string=? "" getopt:scan))
(set! *optarg* getopt:scan)
(set! *optind* (+ *optind* 1))
(set! getopt:scan #f)
((< *optind* (length *argv*))
(set! *optarg* (argref))
(set! *optind* (+ *optind* 1))
((and (not (null? opts)) (char=? #\: (car opts))) #\:)
(else #\?))))))
(define (getopt-- optstring)
(let* ((opt (getopt (string-append optstring "-:")))
(optarg *optarg*))
(cond ((eqv? #\- opt) ;long option
(do ((l (string-length *optarg*))
(i 0 (+ 1 i)))
((or (>= i l) (char=? #\= (string-ref optarg i)))
(cond ((>= i l) (set! *optarg* #f) optarg)
(else (set! *optarg* (substring optarg (+ 1 i) l))
(substring optarg 0 i))))))
(else opt))))