user-idle3 0.7.2

Get a user's idle time.
Documentation 
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use std::{ffi::c_void, os::raw::c_char, ptr::null, time::Duration};

use x11::{
    xlib::{XCloseDisplay, XDefaultScreen, XFree, XOpenDisplay, XRootWindow},
    xss::{XScreenSaverAllocInfo, XScreenSaverQueryInfo},
};

use crate::error::Error;

// Mostly taken from https://stackoverflow.com/questions/222606/detecting-keyboard-mouse-activity-in-linux

pub fn get_idle_time() -> Result<Duration, Error> {
    unsafe {
        let display = XOpenDisplay(null::<c_char>());
        if display.is_null() {
            return Err(Error::new("Failed to open X11 display (no X11 server available)"));
        }

        let info = XScreenSaverAllocInfo();
        if info.is_null() {
            XCloseDisplay(display);
            return Err(Error::new("Failed to allocate XScreenSaverInfo"));
        }

        let screen = XDefaultScreen(display);
        let root_window = XRootWindow(display, screen);
        let status = XScreenSaverQueryInfo(display, root_window, info);
        let time = (*info).idle;

        XFree(info.cast::<c_void>());
        XCloseDisplay(display);

        if status == 1 {
            Ok(Duration::from_millis(time.into()))
        } else {
            Err(Error::new("Status not OK"))
        }
    }
}