moros 0.12.0

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

pub fn main(args: &[&str]) -> Result<(), ExitCode> {
    let n = args.len();
    if n < 2 {
        help();
        return Err(ExitCode::UsageError);
    }
    for i in 1..n {
        match args[i] {
            "-h" | "--help" => {
                help();
                return Ok(());
            }
            _ => continue,
        }
    }

    for arg in &args[1..] {
        let mut pathname = *arg;

        // The commands `drop /usr/alice/` and `drop /usr/alice`
        // are equivalent, but `drop /` should not be modified.
        if pathname.len() > 1 {
            pathname = pathname.trim_end_matches('/');
        }

        if !fs::exists(pathname) {
            error!("Could not find file '{}'", pathname);
            return Err(ExitCode::Failure);
        }

        if let Some(info) = syscall::info(pathname) {
            if info.is_dir() && info.size() > 0 {
                error!("Directory '{}' not empty", pathname);
                return Err(ExitCode::Failure);
            }
        }

        if fs::delete(pathname).is_err() {
            error!("Could not drop file '{}'", pathname);
            return Err(ExitCode::Failure);
        }
    }
    Ok(())
}

fn help() {
    let csi_option = Style::color("aqua");
    let csi_title = Style::color("yellow");
    let csi_reset = Style::reset();
    println!(
        "{}Usage:{} drop {}<path>{}",
        csi_title, csi_reset, csi_option, csi_reset
    );
    println!();
    println!("{}Paths:{}", csi_title, csi_reset);
    println!("  {0}<dir>/{1}     Drop dir", csi_option, csi_reset);
    println!("  {0}<file>{1}     Drop file", csi_option, csi_reset);
}