scaffold: Cargo.toml, module stubs, layer-shell window (step 1+2)

Cargo.toml

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+[package]
+name = "aster"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+gtk4 = "0.11"
+gtk4-layer-shell = "0.8"
+relm4 = { version = "0.11", features = ["macros"] }
+hyprland = "0.4.0-beta.3"
+zbus = { version = "5", default-features = false, features = ["tokio"] }
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"

aster-brief.md

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+# aster — Hyprland Bar & Notification Daemon
+
+Minimal Rust status bar and notification daemon for Hyprland. Replaces colorshell with a lower system footprint. No system tray, no launcher, no wallpaper logic.
+
+---
+
+## Stack
+
+| Crate | Purpose |
+|---|---|
+| `gtk4` | UI toolkit |
+| `gtk4-layer-shell` | Wayland layer surface anchoring |
+| `relm4` | Component architecture for GTK4 |
+| `hyprland` | Hyprland IPC (workspace events) |
+| `zbus` | D-Bus (notifications daemon) |
+| `serde` + `serde_json` | Parse pywal colors.json |
+| `tokio` | Async polling runtime |
+
+---
+
+## Component 1: Top Bar
+
+Full-width bar anchored to the top of the screen via `gtk4-layer-shell`. Single horizontal row, three sections.
+
+### Left — Workspaces
+
+- Numbered workspace buttons sourced from Hyprland IPC
+- Subscribe to live workspace change events via `/tmp/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock`
+- Active workspace highlighted with accent colour
+
+### Centre — Clock
+
+- Format: `HH:MM`
+- Updated every second
+
+### Right — System Stats
+
+Displayed left to right: CPU% → RAM% → Power draw (W) → WiFi SSID
+
+| Stat | Source |
+|---|---|
+| CPU usage | `/proc/stat` delta between polls |
+| RAM usage | `/proc/meminfo` |
+| Power draw | `/sys/class/power_supply/*/power_now` or `current_now * voltage_now` |
+| WiFi SSID | Parse `iw dev` output — no NetworkManager dependency, no system tray |
+
+Polled every 2 seconds.
+
+---
+
+## Component 2: Notification Daemon
+
+Implements the `org.freedesktop.Notifications` D-Bus interface via `zbus`.
+
+- On `Notify` call: spawn a GTK4 layer-shell popup anchored **top-right**, 20px from edge
+- Shows: app name, summary, body
+- Auto-dismisses after the hint timeout (default 5s if unset by sender)
+- Multiple notifications stack vertically downward
+- Supports `CloseNotification`
+
+---
+
+## Theming
+
+Read `~/.cache/wal/colors.json` on startup. Reload on `SIGHUP` for live wallpaper-change integration.
+
+| pywal key | Role |
+|---|---|
+| `special.background` | Bar background (with slight CSS transparency) |
+| `colors.color0` | Widget background / secondary surfaces |
+| `colors.color15` | Foreground text |
+| `colors.color1` | Accent — active workspace, highlights |
+
+Apply as a GTK CSS provider at the `Display` level so the bar and all notification popups share the same palette automatically.
+
+---
+
+## Explicit Non-Goals
+
+- No system tray (`StatusNotifierItem` / `XEmbed`)
+- No launcher or search (external tool handles this)
+- No wallpaper engine (external tool handles this)
+- No Bluetooth, volume, or media controls
+
+---
+
+## Suggested File Structure
+
+```
+aster/
+├── Cargo.toml
+└── src/
+    ├── main.rs                # Init GTK app, spawn bar + notification daemon
+    ├── bar/
+    │   ├── mod.rs
+    │   ├── workspaces.rs      # Hyprland IPC workspace subscription
+    │   ├── clock.rs           # Second-tick clock widget
+    │   └── stats.rs           # CPU, RAM, power draw, WiFi SSID
+    ├── notifications/
+    │   ├── mod.rs             # zbus D-Bus service
+    │   └── popup.rs           # GTK4 layer-shell popup window + stack
+    └── theme.rs               # pywal reader + GTK CSS provider injection
+```
+
+---
+
+## Build Order for Claude Code
+
+Follow this sequence so each step is independently testable:
+
+1. **Scaffold** — `Cargo.toml` with all dependencies, module stubs, empty `main.rs`
+2. **Layer shell anchor** — blank GTK4 window pinned to top of screen; confirm it appears correctly on your setup before adding any widgets
+3. **Theme loader** — read `colors.json`, build CSS string, inject as `CssProvider` at display level
+4. **Bar layout** — three-section `Box`, no data yet, just structure with placeholder labels
+5. **Workspaces** — Hyprland IPC socket reader, live workspace buttons
+6. **Stats poller** — tokio task polling CPU/RAM/power/WiFi, sending results to bar via channels
+7. **Clock** — second-tick timer widget
+8. **Notification daemon** — zbus service on session bus claiming `org.freedesktop.Notifications`
+9. **Notification popup** — layer-shell window anchored top-right, vertical stack, auto-dismiss timer
+10. **Wire SIGHUP** — reload `colors.json` and re-inject CSS on signal
+
+---
+
+## First Prompt for Claude Code
+
+> Create a new Rust project called `aster`. It is a minimal Hyprland status bar and notification daemon. Start with `Cargo.toml` — I need gtk4, relm4, gtk4-layer-shell, hyprland, zbus, tokio, serde, and serde_json as dependencies. Then scaffold the module structure from the file tree in the brief and get a blank GTK4 window anchored full-width to the top of the screen with gtk4-layer-shell before adding any widgets. The layer-shell anchor is the most environment-sensitive step so I want to confirm it works on my setup first.

src/bar/clock.rs

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+

src/bar/mod.rs

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+pub mod clock;
+pub mod stats;
+pub mod workspaces;

src/bar/stats.rs

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+

src/bar/workspaces.rs

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+

src/main.rs

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+mod bar;
+mod notifications;
+mod theme;
+
+use gtk4::prelude::*;
+use gtk4_layer_shell::{Edge, Layer, LayerShell};
+use relm4::prelude::*;
+
+struct App;
+
+#[relm4::component]
+impl SimpleComponent for App {
+    type Init = ();
+    type Input = ();
+    type Output = ();
+
+    view! {
+        gtk::ApplicationWindow {
+            set_title: Some("aster"),
+            set_default_height: 32,
+        }
+    }
+
+    fn init(
+        _: Self::Init,
+        root: Self::Root,
+        _sender: ComponentSender<Self>,
+    ) -> ComponentParts<Self> {
+        root.init_layer_shell();
+        root.set_layer(Layer::Top);
+        root.set_anchor(Edge::Top, true);
+        root.set_anchor(Edge::Left, true);
+        root.set_anchor(Edge::Right, true);
+        root.set_exclusive_zone(32);
+
+        let model = App;
+        let widgets = view_output!();
+        ComponentParts { model, widgets }
+    }
+
+    fn update(&mut self, _: Self::Input, _: ComponentSender<Self>) {}
+}
+
+fn main() {
+    let app = RelmApp::new("sh.breadway.aster");
+    app.run::<App>(());
+}

src/notifications/mod.rs

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+pub mod popup;

src/notifications/popup.rs

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+

src/theme.rs

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+

target/.rustc_info.json

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target/CACHEDIR.TAG

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+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

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