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(define-module (vcalendar datetime)
#:use-module (vcalendar)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-19 util)
#:use-module (util)
#:export (parse-datetime
event-overlaps?
event-in?
ev-time<?)
)
;;; date time pointer
(define (parse-datetime dtime)
"Parse the given date[time] string into a date object."
(let* ((str type (case (string-length dtime)
((8) (values "~Y~m~d" 'all-day)) ; All day
((15) (values "~Y~m~dT~H~M~S" 'local)) ; "local" or TZID-param
((16) (values "~Y~m~dT~H~M~S~z" 'utc)) ; UTC-time
))
(date (string->date dtime str)))
(values date type)))
(define (event-overlaps? event begin end)
"Returns if the event overlaps the timespan.
Event must have the DTSTART and DTEND attribute set."
(timespan-overlaps? (attr event 'DTSTART)
(attr event 'DTEND)
begin end))
(define (event-in? ev time)
"Does event overlap the date that contains time."
(let* ((date (time-utc->date time))
(start (date->time-utc (drop-time date)))
(end (add-day start)))
(event-overlaps? ev start end)))
(define (ev-time<? a b)
(time<? (attr a 'DTSTART)
(attr b 'DTSTART)))
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