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feat(ics): export — share single event + back up local calendars as .ics

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Branch 1 of 2 for v2.7 (the .ics topic). Adds the write side of a
hand-rolled RFC 5545 engine (zero deps, stays on kotlinx-datetime):

- domain/ics: IcsText (escape + 75-octet folding), IcsEvent model,
  IcsWriter.writeCalendar. Timezone rule: all-day VALUE=DATE, one-off
  timed UTC Z, recurring timed TZID-labelled from EVENT_TIMEZONE (no
  VTIMEZONE — import resolves TZID against the OS tz db).
- Single-event share from the detail screen (FileProvider + ACTION_SEND).
- Whole-calendar backup of the writable local calendars to a SAF file
  (Settings -> Calendars -> Export as .ics), one combined VCALENDAR.
- insertEvent now writes Events.UID_2445; legacy rows fall back to a
  stable synthesised UID at export time so a later restore won't dupe.
- EXDATE / RECURRENCE-ID overrides are deliberately skipped this pass
  (documented v1 limit; import will skip them too).

Engine + mapper unit-tested. Import (Branch 2, feat/ics-import) ships in
the same v2.7 release; no tag until both land + on-device review.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jean-Luc Makiola
2026-06-18 14:27:53 +02:00
parent 64d0a89b28
commit 0b683d374f
25 changed files with 1190 additions and 13 deletions
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7
app/src/main/res/xml/file_paths.xml Normal file
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@@ -0,0 +1,7 @@
<?xml version="1.0" encoding="utf-8"?>
<!-- Exposes the cache subdirectory where IcsExporter stages files for sharing. -->
<paths>
<cache-path
name="shared_ics"
path="shared_ics/" />
</paths>