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(define-module (calp util options)
:use-module (calp util)
:use-module (srfi srfi-1)
)
;; option-assoc → getopt-valid option-assoc
(define-public (getopt-opt options)
(map (lambda (optline)
(cons (car optline)
(map (lambda (opt-field)
(cons (car opt-field)
(cond [(eq? 'value (car opt-field))
(cond [(cadr opt-field)
list? => (lambda (opts)
(case (car opts)
;; TODO this should also generate a validator
((options) '(#t))
(else '(#t))))]
[(symbol? (cadr opt-field)) '(optional)]
[else (cdr opt-field)])]
[else (cdr opt-field)])))
(lset-intersection (lambda (a b) (eqv? b (car a)))
(cdr optline)
'(single-char required? value predicate)))))
options))
;; (name (key value) ...) → sxml
(define (fmt-help option-line)
(let ((name (car option-line))
(args (cdr option-line)))
(let ((valuefmt (case (and=> (assoc-ref args 'value) car)
[(#t) '(" " (i value))]
[(#f) '()]
[else => (lambda (s)
(if (list? s)
(case (car s)
[(options)
`(" {" ,(string-join (cdr s) "|") "}")])
`(" [" (i ,s) "]")))])))
`(*TOP* (b "--" ,name) ,@valuefmt
,@(awhen (assoc-ref args 'single-char)
`("," (ws)
(b "-" ,(car it))
,@valuefmt))
(br)
,@(awhen (assoc-ref args 'description)
`((blockquote ,@it)
(br)))))))
(use-modules (text markup))
(define-public (format-arg-help options)
(sxml->ansi-text (cons '*TOP* (map sxml->ansi-text (map fmt-help options)))))
(define*-public (print-arg-help options optional: (port (current-error-port)))
(display (format-arg-help options) port))
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