320 lines
12 KiB
Scheme
320 lines
12 KiB
Scheme
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;;; WORK IN PROGRESS, NOT FOR CONSUMPTION
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;;; TODO: long options
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;;; multiple options in one go, e.g., -XYZ
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;;; concat value with option, e.g., -Xxvalue
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;;; usage error message [ok?]
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;;; -h --help should not be user-defined
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;;; check duplicate options
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(library (command-line)
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(export command-line-interface)
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(import (rnrs))
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(define (dispatch-opts arguments data* proc*)
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(define (print p . args)
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(for-each (lambda (x) (display x p)) args))
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(define (print-usage detailed?)
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(define-record-type f (fields id char type def))
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(define (mkf x id)
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(make-f id (car x) (cadr x) (cddr x)))
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(define (get type ls)
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(filter (lambda (x) (eq? (f-type x) type)) ls))
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(define (fmt-req p)
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(lambda (x)
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(print p " -" (f-char x) " <" (f-id x) ">")))
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(define (fmt-req-no-value p)
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(lambda (x)
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(display " -" p)
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(display (f-char x) p)))
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(define (fmt-z p c)
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(lambda (x)
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(print p " [-" (f-char x) " <" (f-id x) ">]" c)))
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(define (fmt-<> p)
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(lambda (x)
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(display " <" p)
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(display x p)
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(display ">" p)))
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(define (synopsis f* args args-rest)
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(let ([opt* (get 'optional f*)]
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[flag* (get 'flag f*)]
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[req0* (get 'required0 f*)]
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[req1* (get 'required1 f*)]
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[z0* (get 'zero-plus f*)]
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[z1* (get 'one-plus f*)])
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(let-values ([(p e) (open-string-output-port)])
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(display (car arguments) p)
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(for-each (fmt-req-no-value p) req0*)
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(unless (null? flag*)
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(display " [-" p)
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(apply print p (map f-char flag*))
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(display "]" p))
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(for-each (fmt-z p "") opt*)
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(for-each (fmt-z p "*") z0*)
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(for-each (fmt-z p "+") z1*)
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(for-each (fmt-req p) req1*)
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(for-each (fmt-<> p) args)
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(when args-rest
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((fmt-<> p) args-rest)
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(display " ..." p))
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(e))))
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(define (print-usage-line help fields field-ids args args-rest dash-rest)
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(let ([f* (map mkf fields field-ids)])
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(display " ")
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(display (synopsis f* args args-rest))
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(newline)
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(unless (string=? help "")
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(display " ")
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(display help)
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(newline))
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(when detailed?
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(let ([def* (filter f-def (get 'optional f*))])
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(unless (null? def*)
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(for-each
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(lambda (x)
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(print (current-output-port)
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" -" (f-char x)
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" defaults to " (f-def x)
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"\n"))
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def*)))
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(newline))))
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(display "\nUsage:\n")
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(for-each (lambda (x) (apply print-usage-line x)) data*)
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(print-usage-line "Display this help message"
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'([#\h required0 . #f])
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'(dummy)
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'()
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#f
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#f)
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#f)
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(define (arguments-match)
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(define-condition-type &help &condition
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make-help-condition help-condition?
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(extended? help-extended?))
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(define-condition-type &unmatched &condition
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make-unmatched-condition unmatched-condition?)
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(define (help x)
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(raise (make-help-condition x)))
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(define (unmatched)
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(raise (make-unmatched-condition)))
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(define (option? x)
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(or (equal? x "--help") ;;; hack
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(and (string? x)
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(>= (string-length x) 2)
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(char=? (string-ref x 0) #\-)
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(not (char=? (string-ref x 1) #\-)))))
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;;;
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(define (fill-char-opt c ls fields)
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;;; field = [c required0 . _] ; requires 0 args
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;;; | [c required1 . _] ; requires 1 arg
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;;; | [c flag . default] ; toggles default to #t
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;;; | [c zero-plus . reversed-list]
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;;; | [c one-plus . reversed-list]
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;;; | [c optional . default] ; overridden by value
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;;; | [c ok . value] ; already used, not on input
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(let f ([fields fields])
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(when (null? fields) (unmatched))
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(let ([field (car fields)])
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(if (char=? c (car field))
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(let ([t (cadr field)])
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(case t
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[(required1 optional)
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(when (null? ls) (unmatched))
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(let ([val (car ls)] [ls (cdr ls)])
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(values (cons (cons* c 'ok val) (cdr fields)) ls))]
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[(flag)
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(values (cons (cons* c 'ok #t) (cdr fields)) ls)]
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[(zero-plus one-plus)
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(when (null? ls) (unmatched))
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(let ([val (car ls)])
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(values
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(cons (cons* c 'zero-plus (cons val (cddr field)))
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(cdr fields))
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(cdr ls)))]
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[else (unmatched)]))
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(let-values ([(fields ls) (f (cdr fields))])
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(values (cons field fields) ls))))))
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;;;
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(define (fill-option a ls fields)
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(when (string=? a "--help") (help #t))
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(if (= (string-length a) 2)
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(let ([char (string-ref a 1)])
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(when (char=? char #\h) (help #f))
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(fill-char-opt char ls fields))
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(error 'fill-option "not yet")))
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;;;
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(define (match-fields fields ls)
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(if (null? ls)
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(values fields ls)
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(let ([a (car ls)])
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(if (option? a)
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(let-values ([(fields ls) (fill-option a (cdr ls) fields)])
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(match-fields fields ls))
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(values fields ls)))))
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;;;
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(define (match-args args ls)
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(cond
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[(null? args) (values '() ls)]
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[(null? ls) (unmatched)]
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[else
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(let ([a (car ls)])
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(when (option? a) (unmatched))
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(let-values ([(a* ls) (match-args (cdr args) (cdr ls))])
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(values (cons a a*) ls)))]))
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;;;
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(define (match-args-rest a/f ls)
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(if a/f
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(let-values ([(x ls)
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(let f ([ls ls])
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(if (null? ls)
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(values '() ls)
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(let ([a (car ls)])
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(if (string=? a "--")
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(values '() ls)
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(if (option? a)
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(unmatched)
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(let-values ([(a* ls) (f (cdr ls))])
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(values (cons a a*) ls)))))))])
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(values (list x) ls))
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(if (or (null? ls) (string=? (car ls) "--"))
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(values '() ls)
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(unmatched))))
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;;;
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(define (match-dash-rest a/f ls)
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(if a/f
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(if (null? ls)
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'(())
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(if (string=? (car ls) "--")
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(list (cdr ls))
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(unmatched)))
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(if (null? ls) '() (unmatched))))
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;;;
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(define (fix-field x)
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(let ([type (cadr x)] [value (cddr x)])
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(case type
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[(ok flag optional) value]
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[(zero-plus) (reverse value)]
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[else (unmatched)])))
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;;;
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(define (match _help fields _field-ids args args-rest dash-rest)
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(cons (car arguments)
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(let*-values ([(fields ls) (match-fields fields (cdr arguments))]
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[(fields) (map fix-field fields)]
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[(args ls) (match-args args ls)]
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[(args-rest ls) (match-args-rest args-rest ls)]
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[(dash-rest) (match-dash-rest dash-rest ls)])
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(append fields args args-rest dash-rest))))
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;;;
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(guard (con
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[(help-condition? con)
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(print-usage (help-extended? con))])
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(let f ([data* data*] [proc* proc*])
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(if (null? data*)
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(help #f)
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(guard (con
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[(unmatched-condition? con)
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(f (cdr data*) (cdr proc*))])
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(apply (car proc*) (apply match (car data*))))))))
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(arguments-match))
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(define-syntax command-line-interface
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(lambda (stx)
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(define (parse-format stx)
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(define (err str x)
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(syntax-violation #f str stx x))
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(define (prep-str stx)
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(let* ([str (syntax->datum stx)]
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[n (string-length str)]
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[err (lambda (why) (err why stx))])
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(when (< n 2) (err "invalid option string"))
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(unless (char=? (string-ref str 0) #\-)
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(err "option string must start with a dash: -"))
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(cons (string-ref str 1)
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(cond
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[(= n 2) #'(required1)]
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[else
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(case (string-ref str 2)
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[(#\?) #'(flag . #f)]
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[(#\*) #'(zero-plus . ())]
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[(#\+) #'(one-plus . ())]
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[(#\=)
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(cons #'optional (substring str 3 n))]
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[else (err "invalid option")])]))))
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(define (dots? x)
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(and (identifier? x)
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(free-identifier=? x #'(... ...))))
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(define (id? x)
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(and (identifier? x) (not (dots? x))))
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;;;
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(define (command-line-interface ls)
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(define (str? x)
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(let ([d (syntax->datum x)])
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(and (string? d) (not (string=? d "--")))))
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(define (parse-head x)
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(syntax-case x ()
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[(prog . rest)
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(if (id? #'prog)
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(values #'prog #'rest)
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(err "pattern head is not an identifier" #'prog))]
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[_ (err "invalid pattern" x)]))
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(define (parse-opts x)
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(syntax-case x ()
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[(str id . rest)
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(and (id? #'id) (str? #'str))
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(let-values ([(opt-strs opt-ids rest) (parse-opts #'rest)])
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(values (cons (prep-str #'str) opt-strs)
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(cons #'id opt-ids) rest))]
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[_ (values '() '() x)]))
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(define (parse-args x)
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(syntax-case x ()
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[(id dots . rest)
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(and (id? #'id) (dots? #'dots))
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(values '() #'id #'rest)]
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[(id . rest) (id? #'id)
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(let-values ([(args args-rest rest) (parse-args #'rest)])
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(values (cons #'id args) args-rest rest))]
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[_ (values '() #f x)]))
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(define (parse-tail x)
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(syntax-case x ()
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[("--" id) (id? #'id) #'id]
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[() #f]
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[_ (err "invalid pattern segment" x)]))
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(let-values ([(prog ls) (parse-head ls)])
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(let-values ([(opts opt-ids ls) (parse-opts ls)])
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(let-values ([(args args-rest ls) (parse-args ls)])
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(values prog opts opt-ids args args-rest (parse-tail ls))))))
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(define (get-fmls x ls1 ls2 m1 m2)
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(define (cons? x ls) (if x (cons x ls) ls))
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(define (bound-id-member? x ls)
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(and (pair? ls)
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(or (bound-identifier=? x (car ls))
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(bound-id-member? x (cdr ls)))))
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(let ([ls (cons x (append ls1 ls2 (cons? m1 (cons? m2 '()))))])
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(let f ([x (car ls)] [ls (cdr ls)])
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(unless (null? ls)
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(if (bound-id-member? x ls)
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(err "duplicate identifier" x)
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(f (car ls) (cdr ls)))))
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ls))
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(let-values ([(prog opt-strs opt-ids args args-rest dash-rest)
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(command-line-interface stx)])
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(list (get-fmls prog opt-ids args args-rest dash-rest)
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opt-strs opt-ids args args-rest dash-rest)))
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(define (parse-clause stx)
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(syntax-case stx ()
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[(format help-str body body* ...)
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(string? (syntax->datum #'help-str))
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(with-syntax ([((fmls ...) . args)
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(parse-format #'format)])
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(list #'(lambda (fmls ...) body body* ...)
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#'(help-str . args)))]
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[(format body body* ...)
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(parse-clause #'(format "" body body* ...))]))
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(syntax-case stx ()
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[(_ expr clause* ...)
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(with-syntax ([((proc* data*) ...)
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(map parse-clause #'(clause* ...))])
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#'(dispatch-opts expr '(data* ...) (list proc* ...)))])))
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)
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