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Implements org.kde.StatusNotifierWatcher as a D-Bus service so apps like Nextcloud can register their tray icons. Icons are rendered from SNI ARGB pixmaps (falling back to icon-name theme lookup), click calls Activate(0,0), and NameOwnerChanged cleans up ghost icons when an app exits. Styling follows the Bread Design System (4px tertiary radius, xs/sm spacing, opacity transitions). Also fixes a latent infinite-loop risk in osd.rs (.flatten → .map_while) and syncs the notifications server version string to CARGO_PKG_VERSION. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
117 lines
3.4 KiB
Markdown
117 lines
3.4 KiB
Markdown
# breadbar
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Minimal status bar and notification daemon for [Hyprland](https://hyprland.org/) on Wayland.
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A single Rust binary that provides a full-width top bar, a system tray, and a standards-compliant D-Bus notification daemon. No launcher, no wallpaper logic.
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## Features
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**Status bar** (anchored to the top of every monitor via `gtk4-layer-shell`):
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- Left: live workspace buttons sourced from Hyprland IPC, active workspace highlighted
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- Centre: clock (`HH:MM`, updates at the top of each minute)
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- Right: CPU%, RAM, power draw (W), battery level + AC indicator, Bluetooth state, WiFi SSID with signal strength, system tray (SNI)
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**Notification daemon**:
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- Implements `org.freedesktop.Notifications` (D-Bus) — works with any standard notification sender (`notify-send`, etc.)
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- Popups appear top-right, stack vertically, auto-dismiss after the sender-specified timeout (default 5 s)
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- Supports `CloseNotification`
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**Theming**:
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- Reads `~/.cache/wal/colors.json` (pywal) on startup for a palette that matches your wallpaper
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- Falls back to a Catppuccin Mocha palette if pywal is not present
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- User CSS override: `~/.config/breadbar/style.css`
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- Send `SIGHUP` to reload the theme at runtime (integrates with wallpaper-change hooks)
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## Dependencies
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Runtime:
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- GTK4 (≥ 4.12)
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- `gtk4-layer-shell`
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- `iw` — for WiFi SSID/signal (`iw dev <iface> link`)
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- A running Hyprland compositor
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- D-Bus session bus
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Bluetooth status is read from `/sys/class/rfkill` and BlueZ D-Bus; it degrades gracefully if unavailable.
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## Building
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```sh
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cargo build --release
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```
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The binary is at `target/release/breadbar`.
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Requirements: Rust 1.77+ (uses `LazyLock`), a GTK4 development environment (`libgtk-4-dev` / `gtk4` package).
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On Arch Linux:
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```sh
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sudo pacman -S gtk4 gtk4-layer-shell iw
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cargo build --release
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```
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## Running
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```sh
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./target/release/breadbar
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```
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Typically launched from your Hyprland config:
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```
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exec-once = /path/to/breadbar
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```
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breadbar claims `org.freedesktop.Notifications` on the session D-Bus on startup. If another notification daemon is already running, startup will fail — stop the other daemon first.
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## Theming
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### pywal integration
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breadbar reads `~/.cache/wal/colors.json` automatically. To reload after a wallpaper change:
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```sh
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pkill -HUP breadbar
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```
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Or hook it into your wallpaper script:
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```sh
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wal -i /path/to/wallpaper.jpg
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pkill -HUP breadbar
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```
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### Custom CSS
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Drop a `~/.config/breadbar/style.css` file and send `SIGHUP` to reload. This CSS is applied at a higher priority than the pywal palette so you can override anything.
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Example — change the font size:
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```css
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* {
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font-size: 13px;
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}
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```
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## Architecture
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| Module | Responsibility |
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|---|---|
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| `src/main.rs` | GTK4 app entry point, widget tree, `relm4` component |
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| `src/bar/workspaces.rs` | Hyprland IPC event stream, workspace buttons |
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| `src/bar/clock.rs` | Minute-tick clock |
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| `src/bar/stats.rs` | Polling loop: CPU, RAM, power, battery, Bluetooth, WiFi |
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| `src/bar/tray.rs` | `org.kde.StatusNotifierWatcher` D-Bus service, SNI item rendering |
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| `src/notifications/mod.rs` | `org.freedesktop.Notifications` zbus service |
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| `src/notifications/popup.rs` | Layer-shell popup window and card stack |
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| `src/theme.rs` | pywal reader, GTK CSS provider injection |
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Stats are polled every 2 seconds. Bluetooth and WiFi are sampled every 16 seconds and cached in between to avoid hammering D-Bus and `iw`.
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## License
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MIT
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