diff options
| -rw-r--r-- | .gitignore | 5 | ||||
| -rw-r--r-- | Cargo.toml | 6 | ||||
| -rw-r--r-- | src/main.rs | 81 |
3 files changed, 92 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..388c7e7 --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +/target/ +**/*.rs.bk +.idea +*iml +Cargo.lock diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..a801c97 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "batteriewarner" +version = "0.1.0" +authors = ["Yves Fischer <yvesf-git@xapek.org>"] + +[dependencies] diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..b404cfa --- /dev/null +++ b/src/main.rs @@ -0,0 +1,81 @@ +use std::str; +use std::fs::OpenOptions; +use std::io::{Result, Read, Write, Error, ErrorKind}; +use std::convert::AsRef; +use std::path::Path; +use std::thread::sleep; +use std::time::Duration; + +const PATH_ENERGY_NOW: &'static str = "/sys/class/power_supply/BAT0/energy_now"; +const PATH_ENERGY_FULL: &'static str = "/sys/class/power_supply/BAT0/energy_full_design"; +const PATH_LIGHT: &'static str = "/sys/devices/platform/thinkpad_acpi/leds/tpacpi::power/brightness"; + +fn file_read_integer<P: AsRef<Path>>(path: P) -> Result<u64> { + let mut buf = [0; 20]; + let mut file = OpenOptions::new().read(true).open(path.as_ref())?; + let len = file.read(&mut buf)?; + if len < 1 { + return Err(Error::new(ErrorKind::Other, "Empty file")); + }; + + let s = str::from_utf8(&buf[0..len]) + .map_err(|e| Error::new(ErrorKind::Other, e))?; + s.trim().parse() + .map_err(|err| Error::new(ErrorKind::Other, format!("String parse failed: {}", err))) +} + +fn read_battery_percentage() -> Result<u32> { + let now = file_read_integer(PATH_ENERGY_NOW)?; + let full = file_read_integer(PATH_ENERGY_FULL)?; + Ok(((now * 100) / full) as u32) +} + +fn write_brightness(level: u8) -> Result<()> { + let string = format!("{}\n", level); + let mut file = OpenOptions::new().write(true).open(PATH_LIGHT)?; + if file.write(string.as_bytes())? == string.len() { + Ok(()) + } else { + Err(Error::new(ErrorKind::Other, "Failed to write brightness")) + } +} + +fn read_brightness() -> Result<u8> { + let level = file_read_integer(PATH_LIGHT)?; + Ok(level as u8) +} + +fn indicate_battery_level(level: u32) -> Result<()> { + let led_state = read_brightness()?; + let flashing_time: u32 = 10000; + let offtime: u32 = 40; + let ontime: u32 = 20; + let n = flashing_time / (level * offtime + level * ontime); + for _ in 0..n { + write_brightness(0)?; + sleep(Duration::from_millis((level * offtime) as u64)); + write_brightness(1)?; + sleep(Duration::from_millis((level * ontime) as u64)); + } + write_brightness(led_state)?; + Ok(()) +} + +#[allow(unused)] +fn main() { + loop { + let p = read_battery_percentage(); + match p { + Ok(level) => { + println!("Battery Level: {}", level); + if level < 20 { + match indicate_battery_level(level) { + Err(e) => panic!("Error: {}", e), + _ => {} + } + } + } + Err(e) => panic!("Error: {}", e), + } + } +}
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