Add status bar battery support

src/modules/battery.ts

@@ -0,0 +1,38 @@
+import { Accessor, createBinding } from "ags";
+import AstalBattery from "gi://AstalBattery?version=0.1";
+
+export class Battery {
+  private static astalBattery: AstalBattery.Device = AstalBattery.get_default();
+
+  private static batteryInst: Battery;
+
+  constructor() {
+    AstalBattery.get_default();
+  }
+
+  public static getDefault(): Battery {
+    if (!this.batteryInst) {
+      this.batteryInst = new Battery();
+    }
+
+    return this.batteryInst;
+  }
+
+  public static getBattery(): AstalBattery.Device {
+    return this.astalBattery;
+  }
+
+  public bindHasBattery(): Accessor<boolean> {
+    return createBinding(Battery.getBattery(), "isBattery");
+  }
+
+  public bindPercentage(): Accessor<string> {
+    return createBinding(Battery.getBattery(), "percentage").as(
+      (v) => Math.round(v * 100) + "%"
+    );
+  }
+
+  public bindIcon(): Accessor<string> {
+    return createBinding(Battery.getBattery(), "battery_icon_name");
+  }
+}