-;;; {Command Line Options}
-;;;
-
-(define (get-option argv kw-opts kw-args return)
- (cond
- ((null? argv)
- (return #f #f argv))
-
- ((or (not (eq? #\- (string-ref (car argv) 0)))
- (eq? (string-length (car argv)) 1))
- (return 'normal-arg (car argv) (cdr argv)))
-
- ((eq? #\- (string-ref (car argv) 1))
- (let* ((kw-arg-pos (or (string-index (car argv) #\=)
- (string-length (car argv))))
- (kw (symbol->keyword (substring (car argv) 2 kw-arg-pos)))
- (kw-opt? (member kw kw-opts))
- (kw-arg? (member kw kw-args))
- (arg (or (and (not (eq? kw-arg-pos (string-length (car argv))))
- (substring (car argv)
- (+ kw-arg-pos 1)
- (string-length (car argv))))
- (and kw-arg?
- (begin (set! argv (cdr argv)) (car argv))))))
- (if (or kw-opt? kw-arg?)
- (return kw arg (cdr argv))
- (return 'usage-error kw (cdr argv)))))
-
- (else
- (let* ((char (substring (car argv) 1 2))
- (kw (symbol->keyword char)))
- (cond
-
- ((member kw kw-opts)
- (let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
- (new-argv (if (= 0 (string-length rest-car))
- (cdr argv)
- (cons (string-append "-" rest-car) (cdr argv)))))
- (return kw #f new-argv)))
-
- ((member kw kw-args)
- (let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
- (arg (if (= 0 (string-length rest-car))
- (cadr argv)
- rest-car))
- (new-argv (if (= 0 (string-length rest-car))
- (cddr argv)
- (cdr argv))))
- (return kw arg new-argv)))
-
- (else (return 'usage-error kw argv)))))))
-
-(define (for-next-option proc argv kw-opts kw-args)
- (let loop ((argv argv))
- (get-option argv kw-opts kw-args
- (lambda (opt opt-arg argv)
- (and opt (proc opt opt-arg argv loop))))))
-
-(define (display-usage-report kw-desc)
- (for-each
- (lambda (kw)
- (or (eq? (car kw) #t)
- (eq? (car kw) 'else)
- (let* ((opt-desc kw)
- (help (cadr opt-desc))
- (opts (car opt-desc))
- (opts-proper (if (string? (car opts)) (cdr opts) opts))
- (arg-name (if (string? (car opts))
- (string-append "<" (car opts) ">")
- ""))
- (left-part (string-append
- (with-output-to-string
- (lambda ()
- (map (lambda (x) (display (keyword->symbol x)) (display " "))
- opts-proper)))
- arg-name))
- (middle-part (if (and (< (string-length left-part) 30)
- (< (string-length help) 40))
- (make-string (- 30 (string-length left-part)) #\ )
- "\n\t")))
- (display left-part)
- (display middle-part)
- (display help)
- (newline))))
- kw-desc))
-
-
-
-(define (transform-usage-lambda cases)
- (let* ((raw-usage (delq! 'else (map car cases)))
- (usage-sans-specials (map (lambda (x)
- (or (and (not (list? x)) x)
- (and (symbol? (car x)) #t)
- (and (boolean? (car x)) #t)
- x))
- raw-usage))
- (usage-desc (delq! #t usage-sans-specials))
- (kw-desc (map car usage-desc))
- (kw-opts (apply append (map (lambda (x) (and (not (string? (car x))) x)) kw-desc)))
- (kw-args (apply append (map (lambda (x) (and (string? (car x)) (cdr x))) kw-desc)))
- (transmogrified-cases (map (lambda (case)
- (cons (let ((opts (car case)))
- (if (or (boolean? opts) (eq? 'else opts))
- opts
- (cond
- ((symbol? (car opts)) opts)
- ((boolean? (car opts)) opts)
- ((string? (caar opts)) (cdar opts))
- (else (car opts)))))
- (cdr case)))
- cases)))
- `(let ((%display-usage (lambda () (display-usage-report ',usage-desc))))
- (lambda (%argv)
- (let %next-arg ((%argv %argv))
- (get-option %argv
- ',kw-opts
- ',kw-args
- (lambda (%opt %arg %new-argv)
- (case %opt
- ,@ transmogrified-cases))))))))
-
-
-\f
-