makiolaj/calendula

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Jean-Luc Makiola a3d136f55d

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Write a contributing guide, and fix what the forge move left stale (#96 )

(docs) Update all the docs to be up to date with current status quo

2026-07-30 10:40:07 +02:00

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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.

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