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(define-module (vcomponent datetime)
#:use-module (vcomponent)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-19 util)
#:use-module (util)
#:export (parse-datetime
event-overlaps?
overlapping?
event-contains?
ev-time<?)
)
;;; date time pointer
(define (parse-datetime dtime)
"Parse the given date[time] string into a date object."
(string->date
dtime (case (string-length dtime)
((8) "~Y~m~d") ; All day
((15) "~Y~m~dT~H~M~S") ; "local" or TZID-param
((16) "~Y~m~dT~H~M~S~z")))) ; UTC-time
(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 (overlapping? event-a event-b)
(timespan-overlaps? (attr event-a 'DTSTART)
(attr event-a 'DTEND)
(attr event-b 'DTSTART)
(attr event-b 'DTEND)))
(define (event-contains? 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)))
;; Returns length of the event @var{e}, as a time-duration object.
(define-public (event-length e)
(time-difference
(attr e 'DTEND)
(attr e 'DTSTART)))
;; Returns the length of the part of @var{e} which is within the day
;; starting at the time @var{start-of-day}.
(define-public (event-length/day e start-of-day)
(time-difference
(time-min (add-day start-of-day) (attr e 'DTEND))
(time-max start-of-day (attr e 'DTSTART))))
(define-public (ev-time<? a b)
(time<? (attr a 'DTSTART)
(attr b 'DTSTART)))
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