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(define-module (vcalendar recurrence internal)
#:use-module (util)
#:use-module ((ice-9 optargs) #:select (define*-public))
#:use-module (srfi srfi-88)
#:export (make-recur-rule
weekdays intervals))
;; Immutable, since I easily want to be able to generate the recurence set for
;; the same event multiple times.
(define-quick-record recur-rule
(public: freq until count interval bysecond byminute byhour
byday bymonthday byyearday byweekno bymonth bysetpos
wkst))
(define (make-recur-rule interval wkst)
((record-constructor <recur-rule> '(interval wkst)) interval wkst))
;; TODO make this part of define-quick-record.
;; Only "hard" part would be to provide type hints for fields for
;; string conversions.
(define-public (format-recur-rule r)
(define (a f)
((record-accessor <recur-rule> f) r))
(with-output-to-string
(lambda ()
(format #t "#<recur-rule>~%")
(for-each
(lambda (field)
(when (a field)
(format #t " ~8@a: ~a~%"
field
((case field
((until) (@ (srfi srfi-19 util) time->string))
(else identity))
(a field)))))
(record-type-fields <recur-rule>)))))
(define*-public (print-recur-rule r #:optional (port (current-output-port)))
(display (format-recur-rule r) port))
(define weekdays
'(SU MO TU WE TH FR SA))
(define intervals
'(SECONDLY MINUTELY HOURLY DAILY WEEKLY MONTHLY YEARLY))
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