integrate power_bat into config

home-manager/progs/eww/config/scripts/power_bat.rs

@@ -0,0 +1,58 @@
+#!/usr/bin/env rust-script
+
+use std::{fmt, fs::read_to_string, str::FromStr};
+
+const BASE_PATH: &str = "/sys/class/power_supply/BAT1/";
+const CURRENT_NOW_PATH: &str = "current_now";
+const VOLTAGE_NOW_PATH: &str = "voltage_now";
+const STATUS_PATH: &str = "status";
+const FACTOR: f32 = 1e6_f32;
+
+#[derive(Debug)]
+enum Status {
+    Charging,
+    Discharging,
+    NotCharging,
+}
+
+impl FromStr for Status {
+    type Err = &'static str;
+
+    fn from_str(input: &str) -> Result<Status, Self::Err> {
+        match input {
+            "Charging" => Ok(Status::Charging),
+            "Discharging" => Ok(Status::Discharging),
+            "Not charging" => Ok(Status::NotCharging),
+            _ => Err("unknown state"),
+        }
+    }
+}
+
+impl fmt::Display for Status {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(self, f)
+    }
+}
+
+fn fetch_and_trim_into<T: FromStr<Err = impl fmt::Debug>>(path: &str) -> T {
+    let mut content = read_to_string(BASE_PATH.to_owned() + path).unwrap();
+    content.pop();
+    T::from_str(&content).unwrap()
+}
+
+fn fetch_bat_info(path: &str) -> f32 {
+    let value: f32 = fetch_and_trim_into(path);
+    value / FACTOR
+}
+
+fn main() {
+    let current_now: f32 = fetch_bat_info(CURRENT_NOW_PATH);
+    let voltage_now: f32 = fetch_bat_info(VOLTAGE_NOW_PATH);
+    let watts: f32 = current_now * voltage_now;
+    let status: Status = fetch_and_trim_into(STATUS_PATH);
+
+    println!(
+        "voltage: {:.4}\ncurrent: {:.4}\nwatts: {:.4}\nstatus: {}",
+        voltage_now, current_now, watts, status
+    );
+}