_pick_device.rs

#![allow(dead_code)]
//! An arg parser/prompt shared between the `evtest*` examples. Also demonstrates opening/finding
//! connected devices.

pub fn pick_device() -> evdev::Device {
    use std::io::prelude::*;

    let mut args = std::env::args_os();
    args.next();
    if let Some(dev_file) = args.next() {
        evdev::Device::open(dev_file).unwrap()
    } else {
        let mut devices = evdev::enumerate().map(|t| t.1).collect::<Vec<_>>();
        // readdir returns them in reverse order from their eventN names for some reason
        devices.reverse();
        for (i, d) in devices.iter().enumerate() {
            println!("{}: {}", i, d.name().unwrap_or("Unnamed device"));
        }
        print!("Select the device [0-{}]: ", devices.len());
        let _ = std::io::stdout().flush();
        let mut chosen = String::new();
        std::io::stdin().read_line(&mut chosen).unwrap();
        let n = chosen.trim().parse::<usize>().unwrap();
        devices.into_iter().nth(n).unwrap()
    }
}

fn main() {}