basic battery module/service

crates/modules/src/battery.rs

@@ -0,0 +1,41 @@
+//! Battery module: prints the charge percentage from the battery service.
+
+use iced::widget::text;
+use iced::{Element, Task};
+
+use common::{BarModule, BatteryEvent, BatteryMsg, ModuleEffect, Service, Wire};
+
+pub struct Battery {
+    percent: Option<i32>,
+}
+
+impl Battery {
+    pub fn new() -> Self {
+        Self { percent: None }
+    }
+}
+
+impl BarModule for Battery {
+    fn id(&self) -> &'static str {
+        "battery"
+    }
+
+    fn view(&self, _window_id: Option<iced::window::Id>) -> Element<'_, Wire> {
+        match self.percent {
+            Some(percent) => text(format!("{percent}%")).into(),
+            None => text("--").into(),
+        }
+    }
+
+    fn update(&mut self, msg: Wire) -> Task<ModuleEffect> {
+        if let Some(BatteryEvent::PercentageChanged(percent)) = msg.downcast::<BatteryEvent>()
+        {
+            self.percent = Some(*percent);
+        }
+        Task::none()
+    }
+
+    fn services(&self) -> Vec<Service> {
+        vec![BatteryMsg::Events.key()]
+    }
+}

crates/modules/src/lib.rs

@@ -2,6 +2,7 @@
 //! a new file under `src/` plus one entry in `all()` — core never changes.
 
 mod audio;
+mod battery;
 mod clock;
 mod weather;
 mod workspaces;
@@ -15,6 +16,7 @@ pub use weather::*;
 pub fn all(module_config: Table) -> Vec<Box<dyn BarModule>> {
     vec![
         Box::new(audio::Audio::new()),
+        Box::new(battery::Battery::new()),
         Box::new(clock::Clock::new(Some(module_config.clone()))),
         Box::new(weather::WeatherModule::default()),
         Box::new(workspaces::Workspaces::new(Some(module_config))),