# Moonset

## Project

Moonset is a Wayland session power menu, built with Rust + gtk4-rs + gtk4-layer-shell.
Part of the Moonarch ecosystem. A keybind-invoked overlay with 5 actions:
Lock, Logout, Hibernate, Reboot, Shutdown.

## Tech Stack

- Rust (edition 2024), gtk4-rs 0.11, glib 0.22
- gtk4-layer-shell 0.8 for the Wayland Layer Shell (OVERLAY layer)
- `cargo test` for unit tests

## Project Structure

- `src/` — Rust source code (main.rs, power.rs, i18n.rs, config.rs, users.rs, panel.rs)
- `resources/` — GResource assets (style.css, default-avatar.svg)
- `config/` — example configuration files

## Commands

```bash
# Run tests
cargo test

# Release build
cargo build --release

# Start the power menu (in a Niri session)
LD_PRELOAD=/usr/lib/libgtk4-layer-shell.so ./target/release/moonset
```

## Architecture

- `main.rs` — entry point, GTK app, Layer Shell setup, multi-monitor, systemd journal logging, debug level via the `MOONSET_DEBUG` env var, central `GRESOURCE_PREFIX` constant
- `power.rs` — 5 power-action wrappers with absolute paths and a 30s timeout (lock, logout, hibernate, reboot, shutdown)
- `i18n.rs` — locale detection and string tables (DE/EN)
- `config.rs` — TOML config + wallpaper fallback
- `panel.rs` — GTK4 UI (action buttons, inline confirmation, WallpaperWindow)
- `users.rs` — user detection, avatar loading (AccountsService, ~/.face, GResource fallback)
- `resources/style.css` — GTK theme colors for consistency with the active desktop theme

## Design Decisions

See `DECISIONS.md` for the full decision log.

Summary of the most important decisions:
- **OVERLAY instead of TOP layer**: Waybar sits on TOP, moonset must be above it
- **Niri-specific logout** (`niri msg action quit`): Moonarch commits firmly to Niri
- **Single launch per keybind**: no daemon, the GTK `application_id` prevents double launch
- **System icons**: Adwaita/Catppuccin provide all required symbolic icons
- **Lock without confirmation**: lock is immediately reversible, needs no confirm
- **Absolute paths for binaries**: `/usr/bin/systemctl` etc. instead of relative paths (security)
- **GResource bundle**: CSS and default avatar are compiled into the binary (the wallpaper comes from the filesystem)
- **Async power actions**: `glib::spawn_future_local` + `gio::spawn_blocking` with a 30s timeout
- **Journal logging**: `systemd-journal-logger` instead of file logging — `journalctl -t moonset`, debug level via the `MOONSET_DEBUG` env var