init

src/main.rs

@@ -0,0 +1,85 @@
+//! barbar — a Wayland layer-shell status bar built on `iced` + `iced_layershell`.
+//!
+//! Renders a full-width bar pinned to the top of the screen via the
+//! `wlr-layer-shell` protocol. Optionally target a specific output by
+//! passing its name as the first CLI argument.
+
+use iced::widget::{row, text};
+use iced::{Alignment, Element, Length, Task, Theme};
+use iced_layershell::application;
+use iced_layershell::reexport::Anchor;
+use iced_layershell::settings::{LayerShellSettings, StartMode, Settings};
+use iced_layershell::to_layer_message;
+
+/// Height of the bar in logical pixels.
+const BAR_HEIGHT: u32 = 36;
+
+/// Optional width of the bar; `None` means "as wide as the output".
+const BAR_WIDTH: Option<u32> = None;
+
+pub fn main() -> Result<(), iced_layershell::Error> {
+    // Target a specific output if one was given, otherwise the active one.
+    let start_mode = match std::env::args().nth(1) {
+        Some(output) => StartMode::TargetScreen(output),
+        None => StartMode::Active,
+    };
+
+    application(Bar::default, namespace, update, view)
+        .style(style)
+        .settings(Settings {
+            layer_settings: LayerShellSettings {
+                size: Some((BAR_WIDTH.unwrap_or(0), BAR_HEIGHT)),
+                exclusive_zone: BAR_HEIGHT as i32,
+                anchor: Anchor::Top | Anchor::Left | Anchor::Right,
+                start_mode,
+                ..Default::default()
+            },
+            ..Default::default()
+        })
+        .run()
+}
+
+/// Application state. Empty for now; placeholders will evolve into
+/// workspace/clock/system modules.
+#[derive(Debug, Default)]
+struct Bar;
+
+/// Messages produced by user input, events and subscriptions.
+#[to_layer_message]
+#[derive(Debug, Clone)]
+enum Message {
+    /// No-op used as a fallback target for pending subscriptions.
+    Noop,
+}
+
+fn namespace() -> String {
+    String::from("barbar")
+}
+
+fn update(_bar: &mut Bar, _message: Message) -> Task<Message> {
+    Task::none()
+}
+
+fn view(_bar: &Bar) -> Element<'_, Message> {
+    row![
+        text("workspaces").size(14),
+        text("|").size(14),
+        text("clock").size(14),
+        text("|").size(14),
+        text("system").size(14),
+    ]
+    .spacing(12)
+    .padding(8)
+    .align_y(Alignment::Center)
+    .width(Length::Fill)
+    .height(Length::Fill)
+    .into()
+}
+
+fn style(_bar: &Bar, theme: &Theme) -> iced::theme::Style {
+    use iced::theme::Style;
+    Style {
+        background_color: theme.palette().background,
+        text_color: theme.palette().text,
+    }
+}