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|
use std;
use std::io::Read;
mod sys;
// XXX maybe extract this out into a separate crate?
#[derive(Debug)]
pub struct PowerInfo {
power_supplies: Vec<sys::PowerSupplyInfo>,
}
impl PowerInfo {
pub fn new() -> PowerInfo {
let power_supplies = sys::power_supplies();
PowerInfo {
power_supplies,
}
}
pub fn battery_usage(&self) -> Option<f64> {
let mut total_now = 0;
let mut total_full = 0;
for battery in self.batteries() {
if let Some(now) = battery.energy_now {
total_now += now;
}
else {
return None;
}
if let Some(full) = battery.energy_full {
total_full += full;
}
else {
return None;
}
}
if total_full > 0 {
Some((total_now as f64) / (total_full as f64))
}
else {
None
}
}
pub fn charging(&self) -> bool {
for mains in self.mains() {
if mains.online == Some(true) {
return true;
}
}
false
}
pub fn has_batteries(&self) -> bool {
self.batteries().count() > 0
}
fn batteries(&self) -> impl Iterator<Item=&sys::PowerSupplyInfo> {
self.power_supplies
.iter()
.filter(|p| p.ty == sys::PowerSupplyType::Battery)
}
fn mains(&self) -> impl Iterator<Item=&sys::PowerSupplyInfo> {
self.power_supplies
.iter()
.filter(|p| p.ty == sys::PowerSupplyType::AC)
}
}
fn slurp<T, U>(path: U) -> Option<T>
where
T: std::str::FromStr,
U: AsRef<std::path::Path>,
{
let mut contents = String::new();
std::fs::File::open(path).ok().and_then(|mut fh| {
fh.read_to_string(&mut contents)
.ok()
.and_then(|_| contents.trim().parse().ok())
})
}
|
