Random Rust snippet

battery.rs

use regex::Regex;
use std::fs;
use std::path::Path;

fn main() {
    let _ = get_battery_path();
    let p = get_battery_percentages();
    let s = get_battery_status();

    println!("{:?}", p);
    println!("{:?}", s);
}

fn get_battery_path() -> Vec<fs::DirEntry> {
    let global_path = Path::new("/sys/class/power_supply/");
    let re = Regex::new(r"BAT[0-9]+").expect("Wrong RegEx");

    global_path
        .read_dir()
        .unwrap()
        .filter_map(|el| el.ok())
        .filter(|el| re.is_match(el.path().to_str().unwrap()))
        .collect()
}

fn get_battery_percentages() -> Vec<String> {
    let batteries = get_battery_path();

    batteries
        .iter()
        .map(|el| {
            fs::read_to_string(format!("{}/capacity", el.path().display()))
                .unwrap_or(String::from("No battery"))
        })
        .collect()
}

fn get_battery_status() -> Vec<String> {
    let batteries = get_battery_path();

    batteries
        .iter()
        .map(|el| {
            fs::read_to_string(format!("{}/status", el.path().display()))
                .unwrap_or(String::from(""))
        })
        .collect()
}