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(define-module (vcomponent group)
#:use-module (vcomponent)
#:use-module (vcomponent datetime)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-19 util)
#:use-module (srfi srfi-41)
#:use-module (srfi srfi-41 util)
#:export (group-stream get-groups-between))
;; TODO templetize this
(define-stream (group-stream in-stream)
(define (ein? day) (lambda (e) (event-contains? e (date->time-utc day))))
(let loop ((days (day-stream (time-utc->date (attr (stream-car in-stream) 'DTSTART))))
(stream in-stream))
(if (stream-null? stream)
stream-null
(let* ((day (stream-car days))
(tomorow (date->time-utc (stream-car (stream-cdr days)))))
(let ((head (stream-take-while (ein? day) stream))
(tail
(filter-sorted-stream*
(lambda (e) (time<? tomorow (attr e 'DTEND)))
(lambda (e) (time<=? tomorow (attr e 'DTSTART)))
stream)))
(stream-cons (cons day head)
(loop (stream-cdr days)
tail)))))))
(define (get-groups-between groups start-date end-date)
(filter-sorted-stream
;; TODO in-date-range? drops the first date
(compose (in-date-range? start-date end-date)
car)
groups))
(define-public (group->event-list group)
(stream->list (cdr group)))
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