Jean-Luc Makiola
82c3e1d605
Documentation pass after the 2.0 milestone:
- docs/ARCHITECTURE.md — principles (provider as single source of truth,
observer-driven UI, JVM-first tests, no network), layer + reminder
mermaid diagrams, navigation (overlay/held-key, no nav lib), and the
provider lessons (recurring-write invariants, conflict snapshots)
- docs/README.md — map of what documentation lives where, incl. the
convention that superpowers/ plans are historical artifacts while
.planning/ stays current
- README.md — showcase layout (centered header, badges, screenshot
gallery from the fastlane assets, grouped features, install/build/
architecture/roadmap sections); renders on Gitea
- .planning/{PROJECT,REQUIREMENTS,STATE}.md unstaled: read-only-V1 talk
removed, V1/V2 checklists marked shipped, state points at v3 + the
Locations & People go/no-go
release.yaml gains a gitea-release job: on every tag push it extracts the
tag's CHANGELOG section and creates a Gitea release with it as the notes.
No APK assets — distribution stays with the F-Droid repo. Idempotent
(skips an existing release), gated on the test job only so notes appear
even when the F-Droid upload hiccups.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
4.3 KiB
Calendula
A modern Material 3 Expressive calendar for Android.
Reads, writes, and reminds — on top of the system calendar, with zero network access.
Calendula is named after the flower whose name — like the word calendar —
comes from the Latin kalendae, the first day of the month. It lives
entirely on top of Android's CalendarContract: any calendar synced to your
device (CalDAV via DAVx5, Google, local, WebCal subscriptions, …) simply
appears, and everything you create or edit syncs back the same way. No own
database, no sync stack reinvented.
✨ Features
Calendar
- Month, week, and day views with a one-tap view switcher
- Full event details — attendees and their responses, reminders, recurrence (humanized), availability, visibility, foreign time zones
- Per-calendar visibility toggle, grouped by account
Editing
- Create, edit, and delete events — including recurring events with scoped writes: only this event, this and all following, or the whole series
- Recurrence picker with one-tap presets and custom rules (interval, weekday toggles, end conditions); rules it can't express are preserved verbatim
- Conflict-safe saves: if an event changed elsewhere while you were editing, Calendula asks instead of silently overwriting
- Read-only calendars (WebCal, birthdays) are detected and respected
Reminders
- Event reminders delivered by Calendula itself as notifications — essential when it's your only calendar app, since Android delegates reminder delivery to calendar apps
- Tap a reminder to land on the event
Design & privacy
- Real Material 3 Expressive throughout — dynamic color (Android 12+), expressive motion and shapes, light/dark theme
- German and English UI, per-app language setting
- Zero telemetry, zero analytics, no internet permission — your data never leaves the device
📦 Install
Calendula ships through a self-hosted F-Droid repository (releases are built and published automatically from version tags). Alternatively, build from source — see below.
🛠 Building
Requires Android SDK 36+ and JDK 17. The Gradle wrapper is checked in:
./gradlew assembleDebug # debug APK
./gradlew test # JVM unit tests
./gradlew lint # Android lint
If your default JDK is not 17, set JAVA_HOME explicitly.
🏗 Architecture
Single-activity Compose app, layered UI → Repository → DataSource → CalendarContract, observer-driven refresh, JVM-first tests. The full tour —
including the recurring-write and reminder pipelines — lives in
docs/ARCHITECTURE.md.
🗺 Roadmap
Shipped: read (v1.0), write (v1.1–v2.0), reminder delivery (v1.4). Next up: power-user features — widget, search, tablet layouts. The living roadmap is in .planning/ROADMAP.md, the release history in CHANGELOG.md.
📜 License
MIT — Jean-Luc Makiola, 2026