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This commit is contained in:
Felix Ortmann 2020-12-26 12:15:05 +01:00
parent 2424fc3585
commit 7aeca1e2b0
4 changed files with 606 additions and 0 deletions
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Cargo.toml Normal file
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[package]
name = "batalert"
version = "0.1.0"
authors = ["Felix Ortmann <flx.ortmann@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
clap = "2"
crossbeam-channel = "0"
notify-rust = "4"

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