moros 0.12.0

MOROS: Obscure Rust Operating System
Documentation 
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use crate::api::console::Style;
use crate::api::process::ExitCode;
use crate::sys;

pub fn main(args: &[&str]) -> Result<(), ExitCode> {
    if args.len() == 1 {
        return list(false);
    }

    match args[1] {
        "list" => {
            let verbose = args.contains(&"-v") || args.contains(&"--verbose");
            list(verbose)
        }
        _ => help(),
    }
}

fn list(verbose: bool) -> Result<(), ExitCode> {
    let color1 = Style::color("navy");
    let color2 = Style::color("blue");
    let reset = Style::reset();
    if verbose {
        println!(
            "{}+-------------------->{} bus num{}",
            color1, color2, reset
        );
        println!(
            "{}|    +--------------->{} device num{}",
            color1, color2, reset
        );
        println!(
            "{}|    |  +------------>{} function num{}",
            color1, color2, reset
        );
        println!(
            "{}|    |  |   +-------->{} vendor id{}",
            color1, color2, reset
        );
        println!(
            "{}|    |  |   |    +--->{} device id{}",
            color1, color2, reset
        );
        println!("{}|    |  |   |    |{}", color1, reset);
    }
    for d in sys::pci::list() {
        print!(
            "{:04X}:{:02X}:{:02X} [{:04X}:{:04X}]",
            d.bus, d.device, d.function, d.vendor_id, d.device_id
        );
        if verbose {
            println!(
                " {}rev={:#04X} class={:#04X},{:#04X} prog={:#04X}{}",
                color2, d.rev, d.class, d.subclass, d.prog, reset
            );
        } else {
            println!();
        }
    }
    Ok(())
}

fn help() -> Result<(), ExitCode> {
    let csi_option = Style::color("aqua");
    let csi_title = Style::color("yellow");
    let csi_reset = Style::reset();
    println!(
        "{}Usage:{} pci {}<command> <options>{1}",
        csi_title, csi_reset, csi_option
    );
    println!();
    println!("{}Commands:{}", csi_title, csi_reset);
    println!(
        "  {}list{}             List PCI devices",
        csi_option, csi_reset
    );
    println!();
    println!("{}Options:{}", csi_title, csi_reset);
    println!(
        "  {0}-v{1}, {0}--verbose{1}    Increase verbosity",
        csi_option, csi_reset
    );
    Ok(())
}