sync org files with caldav (one way)

caldav-sync.el

#!/usr/bin/emacs --script
;; config
;; storing creds in authinfo
;; https://github.com/dengste/org-caldav#storing-authentication-information-in-authinfonetrc

;; MELPA and use-package stuff -------------------------------------------------

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)

(eval-when-compile
  (require 'use-package))
;; -----------------------------------------------------------------------------

(use-package org-caldav
  :ensure t
  :config
  (progn
    (setq org-caldav-url
          "https://caldav.fastmail.com/dav/calendars/user/")

    (setq org-caldav-calendar-id "")
    (setq org-caldav-inbox (expand-file-name "~/orgzly/inbox.org"))
    (setq org-caldav-files (mapcar 'expand-file-name `("~/orgzly/todo.org")))
    (setq org-caldav-sync-direction 'org->cal)))

(setq org-icalendar-include-todo 'all
      org-icalendar-use-deadline '(event-if-not-todo todo-due)
      org-icalendar-use-scheduled '(todo-start event-if-todo event-if-not-todo)
      org-icalendar-with-timestamps t)

;; does all the work
(org-caldav-sync)