# Calendula

## What This Is

A modern Material 3 Expressive Android calendar app. Lives entirely on top
of Android's `CalendarContract` — any calendar synced to the device (CalDAV
via DAVx5, Google, local, WebCal, …) shows up automatically; creating,
editing, and deleting writes straight back, and reminders are delivered by
the app itself (Etar model). The differentiator is visual: real Material 3
Expressive design that no existing FOSS calendar app delivers.

## Core Value

A calendar app that is genuinely pleasant to look at and use, without
re-inventing the calendar sync stack — leave that to DAVx5 and the system.

## Current Milestone

Milestones 1 (read, v1.0) and 2 (write support, v1.1–v2.0.0 incl. reminder
delivery) are **complete** — v2.0.0 shipped 2026-06-11. Everything since is
tracked as issues and milestones on Codeberg:
<https://codeberg.org/jlmakiola/calendula/milestones>. A milestone maps to its
`release/vX.Y.Z` branch.

## Stack

Kotlin 2.3.21 (paired with KSP 2.3.9 — Kotlin 2.4.0 has no KSP release
yet, do not upgrade until one ships). Jetpack Compose + Material 3
Expressive 1.5.0-alpha21 (alpha is intentional — Expressive APIs only
live in the 1.5 alpha line). Hilt 2.59.2, DataStore. Gradle Kotlin DSL
with Version Catalog. AGP 9.2.1, Gradle 9.5.1. JVM target 17 (exactly — AGP
requires it).

The shared Material 3 Expressive kit, **floret-kit**, is a git submodule wired
in as a Gradle composite build, so it compiles from source rather than resolving
as a dependency.

## Constraints

- **Platform:** Android-only, Android 10+ (minSdk 29), targetSdk 36. No iOS.
- **Offline-first:** all data lives in `CalendarContract` — no app database, no
  sync stack. No `INTERNET` permission; any feature needing one is an explicit
  product decision first.
- **Privacy:** zero telemetry, zero analytics.
- **i18n:** German + English from day one; further languages come from community
  translators via the self-hosted Weblate, which owns every `values-*` file.
- **Tests + CI from day one**, JVM-first.
- **Reproducible release builds**, so the official F-Droid repo can verify the
  published binary against a from-source rebuild.
- **Licence:** MIT.

## Naming

"Calendula" — Latin *kalendae* ("first day of the month", root of "calendar")
is also the etymological root of the marigold flower Calendula. The icon
shows a stylized "1" on a slate squircle.

## Source

**Codeberg (`jlmakiola/calendula`) is canonical** — git, issues, PRs, tags and
releases, plus contributor CI. The self-hosted Gitea instance is build
infrastructure only: it holds the signing key, runs the release pipeline, and
publishes the self-hosted F-Droid repo on Hetzner. Codeberg push-mirrors `main`
and tags to Gitea, where a bumped `versionName` triggers the release. Also
published to the official F-Droid repo. See `docs/RELEASING.md`.