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feat(backup): automatic periodic .ics export of local calendars (#8)
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Scheduled one-way export of local calendars to a user-chosen folder,
overwriting calendula-backup.ics each run — the manual backup, automated.
Not a sync; stays INTERNET-free (provider reads + local file write).

- WorkManager periodic job (deps: work-runtime-ktx, documentfile); worker
  pulls collaborators via a Hilt @EntryPoint, so no custom WorkerFactory
  wiring. First periodic run is delayed one interval so it can't race the
  immediate "run now" feedback run; the writer also overwrites the canonical
  file and cleans up any "(1)" duplicates from earlier races.
- SettingsPrefs: enabled, interval (minutes, floored at 30), folder Uri,
  last-run status; persisted SAF write grant.
- UI in Calendars > Backup: toggle, folder picker, amount+unit interval
  dialog, last-run status line. Notifies after repeated failures.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jean-Luc Makiola
2026-06-27 22:13:55 +02:00
parent a6ae4d7e1d
commit 548e581554
8 changed files with 531 additions and 0 deletions
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28
app/src/main/res/values/strings.xml
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@@ -197,6 +197,14 @@
<item quantity="one">%d hour</item>
<item quantity="other">%d hours</item>
</plurals>
<plurals name="duration_days">
<item quantity="one">%d day</item>
<item quantity="other">%d days</item>
</plurals>
<plurals name="duration_weeks">
<item quantity="one">%d week</item>
<item quantity="other">%d weeks</item>
</plurals>
<!-- Shared event strings -->
<string name="event_untitled">(No title)</string>
@@ -363,6 +371,26 @@
<string name="calendars_backup_header">Backup</string>
<string name="calendars_backup_hint">Local calendars aren\'t synced anywhere, so export them to an .ics file to keep a copy.</string>
<string name="calendars_backup_action">Export as .ics file</string>
<string name="calendars_auto_backup">Automatic backup</string>
<string name="calendars_auto_backup_hint">Periodically export your local calendars to a folder as an .ics file.</string>
<string name="calendars_auto_backup_folder">Backup folder</string>
<string name="calendars_auto_backup_folder_unset">Tap to choose a folder</string>
<string name="calendars_auto_backup_interval">Interval</string>
<string name="calendars_auto_backup_every">Every %1$s</string>
<string name="calendars_auto_backup_interval_min">Minimum 30 minutes.</string>
<string name="calendars_auto_backup_status_never">No automatic backup yet</string>
<string name="calendars_auto_backup_status_ok">Last backup: %1$s</string>
<string name="calendars_auto_backup_status_failed">Last backup failed: %1$s</string>
<string name="backup_channel_name">Backup</string>
<string name="backup_channel_description">Warns if automatic backups fail repeatedly.</string>
<string name="backup_failed_title">Automatic backup failed</string>
<string name="backup_failed_text">Calendula couldn\'t write the backup file. Check the backup folder in Settings.</string>
<string-array name="backup_interval_units">
<item>Minutes</item>
<item>Hours</item>
<item>Days</item>
<item>Weeks</item>
</string-array>
<string name="calendars_backup_failed">Couldn\'t export the backup.</string>
<plurals name="calendars_backup_done">
<item quantity="one">Exported %d event.</item>