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;;; Commentary:
;;; Module for writing components to the vdir storage format.
;;; Currently also has some cases for "big" icalendar files,
;;; but those are currently unsupported.
;;; TODO generalize save-event and remove-event into a general interface,
;;; which different database backends can implement. Actually, do that for all
;;; loading and writing.
;;; Code:
(define-module (vcomponent vdir save-delete)
:use-module (util)
:use-module (vcomponent ical output)
:use-module (vcomponent)
:use-module ((util io) :select (with-atomic-output-to-file))
)
(define / file-name-separator-string)
(define-public (save-event event)
(define calendar (parent event))
(case (prop calendar '-X-HNH-SOURCETYPE)
[(file)
(error "Importing into direct calendar files not supported")]
[(vdir)
(let* ((uid (or (prop event 'UID) (uuidgen))))
(set! (prop event 'UID) uid
;; TODO use existing filename if present?
(prop event '-X-HNH-FILENAME) (string-append
(prop calendar '-X-HNH-DIRECTORY)
/ uid ".ics"))
(with-atomic-output-to-file (prop event '-X-HNH-FILENAME)
(lambda () (print-components-with-fake-parent (list event))))
uid)]
[else
(error "Source of calendar unknown, aborting.")
]))
(define-public (remove-event event)
(define calendar (parent event))
(case (prop calendar '-X-HNH-SOURCETYPE)
[(file)
(error "Removing events from large files unsupported")]
[(vdir)
(delete-file (prop event '-X-HNH-FILENAME))]
[else
(error "Source of calendar unknown, aborting.")
]))
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