From 78f752346a080af9f6930de4582146b2d2eb4fe6 Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Tue, 3 Feb 2026 07:39:50 -0600
Subject: feat(calendar-sync): add RECURRENCE-ID exception handling for
 recurring events

Handle rescheduled instances of recurring calendar events by processing
RECURRENCE-ID properties from ICS files. When someone reschedules a single
instance of a recurring meeting in Google Calendar, the calendar-sync module
now shows the rescheduled time instead of the original RRULE time.

New functions:
- calendar-sync--get-recurrence-id: Extract RECURRENCE-ID from event
- calendar-sync--get-recurrence-id-line: Get full line with TZID params
- calendar-sync--parse-recurrence-id: Parse into (year month day hour minute)
- calendar-sync--collect-recurrence-exceptions: Collect all exceptions by UID
- calendar-sync--occurrence-matches-exception-p: Match occurrences to exceptions
- calendar-sync--apply-single-exception: Apply exception data to occurrence
- calendar-sync--apply-recurrence-exceptions: Apply all exceptions to occurrences

Also adds DeepSat calendar configuration (dcal-file) to user-constants,
init.el, and org-agenda-config.

48 unit and integration tests added covering normal, boundary, and error cases.
---
 init.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'init.el')

diff --git a/init.el b/init.el
index 4a6ab360..00902206 100644
--- a/init.el
+++ b/init.el
@@ -122,7 +122,10 @@
          :file ,gcal-file)
         (:name "proton"
          :url "***REMOVED***"
-         :file ,pcal-file)))
+         :file ,pcal-file)
+        (:name "deepsat"
+         :url "***REMOVED***"
+         :file ,dcal-file)))
 (require 'calendar-sync)
 
 (require 'org-refile-config)     ;; refile org-branches
-- 
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