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(define-module (vcalendar)
#:use-module (vcalendar primitive)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (make-vcomponent children set-attr! get-attr type
type-filter
transform-attr! push-child!))
(define (make-vcomponent path)
(if (string-ci=? ".ics" (string-take-right path 4))
;; == Single ICS file ==
;; Remove the abstract ROOT component,
;; returning the wanted VCALENDAR component
(car (%vcomponent-children
(%vcomponent-make path)))
;; == Assume vdir ==
;; Also removes the abstract ROOT component, but also
;; merges all VCALENDAR's children into the first
;; VCALENDAR, and return that VCALENDAR.
;;
;; TODO the other VCALENDAR components might not get thrown away,
;; this since I protect them from the GC in the C code.
(reduce (lambda (cal accum)
(for-each (cut %vcomponent-push-child! accum <>)
(%vcomponent-children cal))
accum)
'() (%vcomponent-children (%vcomponent-make path)))))
(define (type-filter t lst)
(filter (lambda (e) (eqv? t (type e)))
lst))
(define* (children component #:optional only-type)
(let ((childs (%vcomponent-children component)))
(if only-type
(type-filter only-type childs)
childs)))
(define set-attr! %vcomponent-set-attribute!)
(define get-attr %vcomponent-get-attribute)
(define type %vcomponent-type)
(define parent %vcomponent-parent)
(define push-child! %vcomponent-push-child!)
(define (transform-attr! ev field transformer)
"Apply transformer to field in ev, and store the result back."
(set-attr! ev field
(transformer
(get-attr ev field))))
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