udevrs 0.5.0

Pure Rust implementation of the user-land udev library
Documentation 
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use std::sync::Arc;

use udevrs::{Error, Result, Udev, UdevHwdb};

mod common;

#[test]
fn parse_hwdb() -> Result<()> {
    common::init();

    std::env::set_var("UDEV_HWDB_BIN", "./hwdb.bin");
    let udev = Arc::new(Udev::new());

    let mut hwdb = UdevHwdb::new(udev)?;

    // vendor
    let root_hub = hwdb
        .query("usb:v1D6B")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for usb:v1D6B".into(),
        ))?
        .iter()
        .find(|e| e.name() == "ID_VENDOR_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(root_hub, Some("Linux Foundation"));

    // pci in example
    let pci = hwdb
        .query("pci:v00008086d00001C2D*")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for pci:v00008086d00001C2D".into(),
        ))?
        .iter()
        .find(|e| e.name() == "ID_VENDOR_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(pci, Some("Intel Corporation"));

    // vendor and product
    let root_hub_30 = hwdb
        .query("usb:v1D6Bp0003")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for usb:v1D6Bp0003".into(),
        ))?
        .iter()
        .find(|e| e.name() == "ID_MODEL_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(root_hub_30, Some("3.0 root hub"));

    // class
    let hid = hwdb
        .query("usb:v*p*d*dc03*")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for usb:v*p*d*dc03*".into(),
        ))?
        .iter()
        .find(|e| e.name() == "ID_USB_CLASS_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(hid, Some("Human Interface Device"));

    // specific class, subclass and protocol
    let query = hwdb
        .query("usb:v*p*d*dc03dsc01dp01dp01")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for usb:v*p*d*dc03*dsc01".into(),
        ))?;
    let subclass = query
        .iter()
        .find(|e| e.name() == "ID_USB_SUBCLASS_FROM_DATABASE")
        .map(|e| (e.value()));
    let protocol = query
        .iter()
        .find(|e| e.name() == "ID_USB_PROTOCOL_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(subclass, Some("Boot Interface Subclass"));
    assert_eq!(protocol, Some("Keyboard"));

    // class, subclass and protocol wildcard at end
    let at = hwdb
        .query("usb:v*p*d*dc02dsc02dp05*")
        .ok_or(Error::UdevHwdb(
            "no matching entry found for usb:v*p*d*dc02dsc02dp05*".into(),
        ))?
        .iter()
        .find(|e| e.name() == "ID_USB_PROTOCOL_FROM_DATABASE")
        .map(|e| (e.value()));

    assert_eq!(at, Some("AT-commands (3G)"));

    Ok(())
}

#[test]
fn invalid_queries() -> Result<()> {
    common::init();

    std::env::set_var("UDEV_HWDB_BIN", "./hwdb.bin");
    let udev = Arc::new(Udev::new());

    let mut hwdb = UdevHwdb::new(udev)?;
    let query = hwdb.query("");
    assert!(query.is_none());

    let query = hwdb.query("*x*");
    assert!(query.is_none());

    let query = hwdb.query("null:v1D6B");
    assert!(query.is_none());

    Ok(())
}