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;;; emacsconf-update.el --- Update an Org file with the current schedule -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Sacha Chua
;; Author: Sacha Chua <sacha@sachachua.com>
;; Keywords: convenience, calendar
;; Version: 0.1
;; URL: https://github.com/emacsconf/emacsconf-el
;;
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; The following code should retrieve the conference schedule and update
;; a file that people use for notes. It should keep the notes people
;; already have, and just update the scheduled times or create new notes
;; as needed. If the calendar file has UID properties, it is used to
;; match headings. If not, headings are used.
;; Make a file for your notes with Org, and then call
;; =M-x emacsconf-update-org-from-ical-url= . It should load the talks and
;; tentative schedules from the wiki. You can call it again and it should
;; update the titles and schedules while still keeping whatever notes
;; you've added.
;;
;; You may also like =M-x emacsconf-update-view-org-agenda=.
;;
;;; Code:
(defgroup emacsconf-update nil
"Convenience functions for downloading the schedule and updating an Org file."
:group 'communication)
(defcustom emacsconf-update-ical-url "https://emacsconf.org/current/emacsconf.ics"
"URL to get schedule updates from."
:type 'string
:group 'emacsconf-update)
(defcustom emacsconf-update-create-entries t
"Non-nil means create missing entries."
:type '(choice (const t "Create missing entries")
(const nil "Don't create missing entries"))
:group 'emacsconf-update)
(require 'icalendar)
(require 'ox-icalendar)
(defun emacsconf-update-org-from-ical-url ()
"Update current notes from iCalendar file at `emacsconf-update-ical-url'."
(interactive)
(emacsconf-update-org-from-ical-string
(with-temp-buffer
(url-insert-file-contents emacsconf-update-ical-url)
(buffer-string))))
(defun emacsconf-update-org-from-ical-file (filename)
"Prompt for FILENAME and update current notes from schedule."
(interactive "FFilename: ")
(emacsconf-update-org-from-ical-string (with-temp-buffer (insert-file-contents filename) (buffer-string))))
(defun emacsconf-ical-get-calendar-from-string (string)
"Read the calendar data from STRING."
(with-temp-buffer
(insert string)
(goto-char (point-min))
(with-current-buffer (icalendar--get-unfolded-buffer (current-buffer))
(goto-char (point-min))
(when (re-search-forward "^BEGIN:VCALENDAR\\s-*$" nil t)
(beginning-of-line)
(icalendar--read-element nil nil)))))
(defun emacsconf-update--get-time-from-event (event property zone-map)
"Return time of EVENT in PROPERTY with possible conversion from ZONE-MAP."
(let* ((dt (icalendar--get-event-property event property))
(tz (icalendar--find-time-zone (icalendar--get-event-property-attributes event property) zone-map)))
(apply 'encode-time (icalendar--decode-isodatetime dt nil tz))))
(defun emacsconf-update--format-new-entry (event zone-map)
"Return string for new entry for EVENT."
(let* ((dtstart-time (emacsconf-update--get-time-from-event event 'DTSTART zone-map))
(dtend-time (emacsconf-update--get-time-from-event event 'DTEND zone-map)))
(format "\n* %s\n:PROPERTIES:\n:UUID: %s\n:URL: %s\n:END:\nTentative schedule: %s--%s\n\n"
(icalendar--convert-string-for-import
(icalendar--get-event-property event 'SUMMARY))
(icalendar--get-event-property event 'UID)
(icalendar--get-event-property event 'URL)
(org-format-time-string (cdr org-time-stamp-formats) dtstart-time)
(org-format-time-string (cdr org-time-stamp-formats) dtend-time))))
(defun emacsconf-update--update-entry (event zone-map)
"Update the current Org heading to match EVENT.
Use ZONE-MAP for timestamp decoding."
(let* ((dtstart-time (emacsconf-update--get-time-from-event event 'DTSTART zone-map))
(dtend-time (emacsconf-update--get-time-from-event event 'DTEND zone-map)))
(org-back-to-heading)
(when (looking-at org-complex-heading-regexp)
(replace-match (icalendar--convert-string-for-import
(icalendar--get-event-property event 'SUMMARY))
t t nil 4))
(org-end-of-meta-data)
(when (re-search-forward (concat "Tentative schedule: " org-ts-regexp "--" org-ts-regexp " *\n")
nil
(save-excursion (org-end-of-subtree)))
(replace-match ""))
(insert "Tentative schedule: "
(org-format-time-string (cdr org-time-stamp-formats)
dtstart-time)
"--"
(org-format-time-string (cdr org-time-stamp-formats)
dtend-time)
"\n")))
(defun emacsconf-update-org-from-ical-string (string)
"Update Org headings in current file by using STRING."
(save-excursion
(let* ((ical (emacsconf-ical-get-calendar-from-string string))
(zone-map (icalendar--convert-all-timezones ical)))
(mapc (lambda (e)
(let ((pos (org-find-property "UUID" (icalendar--get-event-property e 'UID))))
(cond
(pos
(goto-char pos)
(emacsconf-update--update-entry e zone-map))
(emacsconf-update-create-entries
(goto-char (point-max))
(insert (emacsconf-update--format-new-entry e zone-map))))))
(icalendar--all-events ical)))))
;;;###autoload
(defun emacsconf-update-view-org-agenda ()
"Display the agenda."
(interactive)
(let (times
min-time
max-time
(org-agenda-files (list (buffer-file-name))))
;; Collect all the times
(save-excursion
(goto-char (point-min))
(while (re-search-forward org-ts-regexp nil t)
(setq times (cons (time-to-days (encode-time (org-parse-time-string (match-string 0)))) times)))
(setq min-time (apply 'min times) max-time (apply 'max times)))
(org-agenda-list nil
min-time
(1+ (- max-time min-time)))))
(provide 'emacsconf-update)
;;; emacsconf-update.el ends here
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