;; Copyright 2007-2010, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
(define args:arg-hash (make-hash-table))
(define (args:get-arg arg . default)
(if (null? default)
(hash-table-ref/default args:arg-hash arg #f)
(hash-table-ref/default args:arg-hash arg (car default))))
(define (args:get-arg-from ht arg . default)
(if (null? default)
(hash-table-ref/default ht arg #f))
(hash-table-ref/default ht arg (car default)))
(define (args:usage . args)
(if (> (length args) 0)
(apply print "ERROR: " args))
(if (string? help)
(print help)
(print "Usage: " (car (argv)) " ... "))
(exit 0))
;; args:
(define (args:get-args args params switches arg-hash num-needed)
(let* ((numargs (length args))
(adj-num-needed (if num-needed (+ num-needed 2) #f)))
(if (< numargs (if adj-num-needed adj-num-needed 2))
(if (>= num-needed 1)
(args:usage "No arguments provided"))
(let loop ((arg (cadr args))
(tail (cddr args))
(remargs '()))
(cond
((member arg params) ;; args with params
(if (< (length tail) 1)
(args:usage "param given without argument " arg)
(let ((val (car tail))
(newtail (cdr tail)))
(hash-table-set! arg-hash arg val)
(if (null? newtail) remargs
(loop (car newtail)(cdr newtail) remargs)))))
((member arg switches) ;; args with no params (i.e. switches)
(hash-table-set! arg-hash arg #t)
(if (null? tail) remargs
(loop (car tail)(cdr tail) remargs)))
(else
(if (null? tail)(append remargs (list arg)) ;; return the non-used args
(loop (car tail)(cdr tail)(append remargs (list arg))))))))
))
(define (args:print-args remargs arg-hash)
(print "ARGS: " remargs)
(for-each (lambda (arg)
(print " " arg " " (hash-table-ref/default arg-hash arg #f)))
(hash-table-keys arg-hash)))