Calendar.app to Nextcloud

Your employer’s Exchange (or Google Workspace) calendar is in Calendar.app on your Mac, but not reachable over CalDAV. Capycal reads it through EventKit and writes blockers to a Nextcloud calendar. Run it with the desktop app or a LaunchAgent.

In the app: Add Sync…, pick the Exchange calendar under its account in the source list (the app asks for calendar access first) and the Nextcloud calendar as the target. The window of days is Calendar.app events under Advanced settings.

In the config:

[daemon]
log_level = "info"

# The Exchange account's calendar as shown in Calendar.app
[accounts.nextcloud]
url = "https://cloud.example.org/remote.php/dav/"
username = "alice"
password = { file = "nextcloud.secret" }

[calendars.work]
eventkit_calendar = "Exchange/Calendar"

[calendars.nextcloud]
account = "nextcloud"
url = "https://cloud.example.org/remote.php/dav/calendars/alice/work-blockers/"

[syncs.work-to-nextcloud]
source = "work"
target = "nextcloud"
interval = "5m"
eventkit_days_past = 7
eventkit_days_future = 180

transforms = [
  { field = "SUMMARY", action = "set_field", value = "Busy ({{source_name}})" },
]

• Find the exact eventkit_calendar value with capycal --discover-eventkit. The account name (“Exchange” here) is the one in Calendar.app’s sidebar; use the identifier if names are ambiguous.
• Calendar.app delivers recurring events as single occurrences, so the target gets one event per occurrence within the window.
• The window here is one week back and six months ahead, which keeps each cycle fast. Blockers older than a week are removed from Nextcloud.
• nextcloud.secret is read from the config’s directory (~/Library/Application Support/capycal/ by default). Make it readable only by you.

This config only validates on macOS. On Linux, --validate reports eventkit_calendar is only supported on macOS.