109 lines
3.5 KiB
Rust
109 lines
3.5 KiB
Rust
use clap::{App, Arg};
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use crossbeam_channel::{select, tick};
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use notify_rust::{Notification, Urgency};
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use std::fs;
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use std::time::Duration;
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fn main() {
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// parse CLI options
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let matches = App::new("batalert")
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.version("0.1.0")
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.author("Felix Ortmann <flx.ortmann@gmail.com>")
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.about("Sends D-Bus notification when battery runs low.")
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.arg(
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Arg::with_name("uevent")
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.short("u")
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.long("uevent")
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.default_value("/sys/class/power_supply/BAT0/uevent")
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.help("Read the battery capacity from this uevent file."),
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)
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.arg(
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Arg::with_name("threshold")
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.short("t")
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.long("threshold")
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.default_value("15")
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.help("Send the first notification when battery falls below this"),
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)
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.arg(
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Arg::with_name("notification-step")
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.short("n")
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.long("notification-step")
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.default_value("3")
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.help("Repeat notifications for every n percent the battery discharges"),
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)
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.arg(
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Arg::with_name("icon")
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.short("i")
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.long("icon")
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.default_value("/usr/share/icons/Adwaita/256x256/legacy/battery-caution.png")
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.help("Use this icon (PNG) when displaying notifications"),
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)
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.get_matches();
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let uevt_file = matches.value_of("uevent").unwrap();
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let icon = matches.value_of("icon").unwrap();
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let threshold = matches
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.value_of("threshold")
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.unwrap()
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.parse::<i8>()
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.unwrap();
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let step = matches
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.value_of("notification-step")
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.unwrap()
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.parse::<i8>()
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.unwrap();
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// periodic task to compare battery level with configuration
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watch(&uevt_file, threshold, step, icon);
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}
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// Checks the current battery percentage, alerts the user if the battery
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// discharges and is below the configured threshold
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fn watch(uevt_file: &str, threshold: i8, step: i8, icon: &str) {
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let ticker = tick(Duration::from_millis(5000));
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let mut alert_threshold = threshold;
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loop {
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select! {
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recv(ticker) -> _ => {
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let (cap, status) = extract_status(&uevt_file);
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if status.to_lowercase() == "discharging" && cap <= alert_threshold {
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Notification::new()
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.summary(&format!("Battery {}%", cap))
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.body("Charge your battery soon to avoid shutdown")
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.icon(icon)
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.urgency(Urgency::Critical)
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.show()
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.unwrap();
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alert_threshold = cap - step;
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}
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else if status.to_lowercase() == "charging" {
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alert_threshold = threshold;
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}
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}
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}
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}
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}
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// Extracts the battery capacity (percentage) and charging status
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fn extract_status(uevt_file: &str) -> (i8, String) {
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let contents = fs::read_to_string(uevt_file).expect("Something went wrong reading the file");
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let cap = contents
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.lines()
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.find(|s| s.contains("POWER_SUPPLY_CAPACITY"))
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.unwrap()
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.split("=")
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.nth(1)
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.unwrap()
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.parse::<i8>()
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.unwrap();
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let status = contents
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.lines()
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.find(|s| s.contains("POWER_SUPPLY_STATUS"))
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.unwrap()
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.split("=")
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.nth(1)
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.unwrap()
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.to_string();
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return (cap, status);
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}
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