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power.rs
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power.rs
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::fmt;
#[derive(Debug)]
pub enum Error {
Unsupported,
Error(Box<dyn std::error::Error>),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Error::Unsupported => write!(f, "Battery status is unsupported on this platform"),
Error::Error(err) => write!(f, "Battery status retrieval failed: {}", err),
}
}
}
#[cfg(all(feature = "battery", any(
target_os = "linux",
target_os = "macos",
target_os = "windows",
target_os = "dragonfly",
target_os = "freebsd"
)))]
mod platform {
use super::Error;
use battery::{self, Manager, State};
impl From<battery::errors::Error> for Error {
fn from(err: battery::errors::Error) -> Error {
// Box the error so that the battery::errors::Error type does
// not leak out of this module.
Error::Error(Box::new(err))
}
}
pub fn is_battery_discharging() -> Result<bool, Error> {
let manager = Manager::new()?;
for battery in manager.batteries()? {
if battery?.state() == State::Discharging {
return Ok(true);
}
}
Ok(false)
}
}
#[cfg(any(not(feature = "battery"), not(any(
target_os = "linux",
target_os = "macos",
target_os = "windows",
target_os = "dragonfly",
target_os = "freebsd"
))))]
mod platform {
use super::Error;
pub fn is_battery_discharging() -> Result<bool, Error> {
Err(Error::Unsupported)
}
}
pub use platform::is_battery_discharging;