config: Generate configs

src/widgets/backlight.rs

@@ -39,6 +39,14 @@ impl Backlight {
         dev.update();
         BarWidget::new(Box::new(dev), fm, font, size)
     }
+
+    pub fn detect(path: &str) -> bool {
+        let path = Path::new("/sys/class/backlight").to_path_buf().join(path);
+        match read_file_as_u64(path.join("brightness").as_path()) {
+            Ok(_) => true,
+            Err(_) => false,
+        }
+    }
 }
 
 impl BarWidgetImpl for Backlight {

src/widgets/battery.rs

@@ -2,6 +2,7 @@ use std::{
     sync::{Arc, Mutex},
     thread,
     time::Duration,
+    error::Error,
 };
 
 use dbus::blocking::{
@@ -46,6 +47,19 @@ struct InnerBattery {
     dirty: bool,
 }
 
+fn get_battery_state() -> Result<UpowerBatteryState, Box<dyn Error>> {
+    let conn = LocalConnection::new_system()?;
+    let device_path = "/org/freedesktop/UPower/devices/DisplayDevice";
+    let proxy = conn.with_proxy(
+        "org.freedesktop.UPower",
+        device_path,
+        Duration::from_millis(500),
+    );
+    let state: u32 = proxy
+        .get("org.freedesktop.UPower.Device", "State")?;
+    Ok(UpowerBatteryState::from_dbus(state as u64))
+}
+
 fn start_monitor(inner: Arc<Mutex<InnerBattery>>, events: Arc<Mutex<Events>>) {
     thread::Builder::new()
         .name("battmon".to_string())
@@ -131,6 +145,13 @@ impl Battery {
         start_monitor(battery.inner.clone(), events);
         BarWidget::new(Box::new(battery), fm, font, size)
     }
+
+    pub fn detect() -> bool {
+        match get_battery_state() {
+            Ok(_) => true,
+            Err(_) => false,
+        }
+    }
 }
 
 impl BarWidgetImpl for Battery {