diff options
Diffstat (limited to 'module/vcalendar.scm')
| -rw-r--r-- | module/vcalendar.scm | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/module/vcalendar.scm b/module/vcalendar.scm index a4da1527..ef6fbd92 100644 --- a/module/vcalendar.scm +++ b/module/vcalendar.scm @@ -2,18 +2,50 @@ #:use-module (vcalendar primitive) #:use-module (vcalendar datetime) #:use-module (vcalendar recur) + #:use-module (vcalendar timezone) #:use-module (srfi srfi-1) + #:use-module (srfi srfi-19) + #:use-module (srfi srfi-19 util) #:use-module (srfi srfi-26) #:use-module (util) #:export (make-vcomponent) #:re-export (repeating?)) +;; All VTIMEZONE's seem to be in "local" time in relation to +;; themselves. Therefore, a simple comparison should work, +;; and then the TZOFFSETTO attribute can be subtracted from +;; the event DTSTART to get UTC time. + +(define string->time-utc + (compose date->time-utc (unval parse-datetime))) + (define (parse-dates! cal) "Parse all start times into scheme date objects." - (for-each-in (children cal 'VEVENT) - (lambda (ev) - (mod! (attr ev "DTSTART") parse-datetime) - (mod! (attr ev "DTEND") parse-datetime))) + + (for-each-in (children cal 'VTIMEZONE) + (lambda (tz) + (for-each (lambda (p) (mod! (attr p "DTSTART") string->time-utc)) + (children tz)) + + ;; TZSET is the generated recurrence set of a timezone + (set! (attr tz 'X-HNH-TZSET) + (make-tz-set tz)))) + + (for-each + (lambda (ev) + (mod! (attr ev "DTSTART") string->time-utc + (attr ev "DTEND") string->time-utc) + + (when (prop (attr* ev 'DTSTART) 'TZID) + (let* ((of (get-tz-offset ev))) + (set! (prop (attr* ev 'DTSTART) 'TZID) #f) + ;; 5545 says that DTEND is local time iff DTSTART is local time. + ;; But who says that will be true... + (mod! (attr ev 'DTSTART) + (cut subtract-duration <> (make-duration of)))))) + (children cal 'VEVENT)) + + ;; Return cal) |