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mtargs.scm at [7bfbd68003]
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File mtargs/mtargs.scm artifact 09e4f74c98 part of check-in 7bfbd68003


;; Copyright 2007-2010, Matthew Welland.
;;
;; This file is part of mtargs.
;; 
;;     mtargs is free software: you can redistribute it and/or modify
;;     it under the terms of the GNU General Public License as published by
;;     the Free Software Foundation, either version 3 of the License, or
;;     (at your option) any later version.
;; 
;;     mtargs is distributed in the hope that it will be useful,
;;     but WITHOUT ANY WARRANTY; without even the implied warranty of
;;     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;     GNU General Public License for more details.
;; 
;;     You should have received a copy of the GNU General Public License
;;     along with mtargs.  If not, see <http://www.gnu.org/licenses/>.


(module mtargs
    (
     arg-hash
     get-arg
     get-arg-number
     get-arg-from
     get-args
     usage
     print-args
     any-defined?
     ) 

(import scheme) ;; gives us cond-expand in chicken-4

(cond-expand
 (chicken-5
  (import scheme (chicken base) (chicken port) (chicken file) (chicken process-context))
  (import srfi-69 srfi-1))
 (chicken-4
  (import chicken posix srfi-69 srfi-1))
 (else))

(define usage (make-parameter print))
(define arg-hash (make-hash-table))

(define (get-arg arg . default)
  (if (null? default)
      (hash-table-ref/default arg-hash arg #f)
      (hash-table-ref/default arg-hash arg (car default))))

;; get an arg as a number
(define (get-arg-number arg . default)
  (let* ((val-str (get-arg arg))
	 (val     (if val-str (string->number val-str) #f)))
    (if val
	val
	(if (null? default)
	    #f
	    default))))

(define (any-defined? . args)
  (not (null? (filter (lambda (x) x)
		      (map get-arg args)))))

;; (define any any-defined?)

(define (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 (get-args args params switches arg-hash num-needed)
  (let* ((numtargs (length args))
	 (adj-num-needed (if num-needed (+ num-needed 2) #f)))
    (if (< numtargs (if adj-num-needed adj-num-needed 2))
	(if (>= num-needed 1)
	    (usage "No arguments provided")
	    '())
	(let loop ((arg (cadr args))
		   (tail (cddr args))
		   (remtargs '()))
	  (cond 
	   ((member arg params) ;; args with params
	    (if (< (length tail) 1)
		(usage "param given without argument " arg)
		(let ((val     (car tail))
		      (newtail (cdr tail)))
		  (hash-table-set! arg-hash arg val)
		  (if (null? newtail) remtargs
		      (loop (car newtail)(cdr newtail) remtargs)))))
	   ((member arg switches)         ;; args with no params (i.e. switches)
	    (hash-table-set! arg-hash arg #t)
	    (if (null? tail) remtargs
		(loop (car tail)(cdr tail) remtargs)))
	   (else
	    (if (null? tail)(append remtargs (list arg)) ;; return the non-used args
		(loop (car tail)(cdr tail)(append remtargs (list arg))))))))
    ))

(define (print-args arg-hash)
  (for-each (lambda (arg)
	      (print "   " arg "   " (hash-table-ref/default arg-hash arg #f)))
	    (hash-table-keys arg-hash)))

(define (any-defined? . args)
  (not (null? (filter (lambda (x) x)
		      (map get-arg args)))))


)