vhdx-cli 0.1.1

CLI tool for inspecting VHDX disk images
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use std::path::PathBuf;
use std::process;

use clap::{Parser, Subcommand};
use vhdx::VhdxReader;

fn fmt_commas(n: u64) -> String {
    let s = n.to_string();
    let mut out = String::with_capacity(s.len() + s.len() / 3);
    for (i, c) in s.chars().rev().enumerate() {
        if i > 0 && i % 3 == 0 {
            out.push(',');
        }
        out.push(c);
    }
    out.chars().rev().collect()
}

#[derive(Parser)]
#[command(name = "vhdx", version, about = "CLI tool for VHDX disk images")]
struct Cli {
    #[command(subcommand)]
    command: Command,
}

#[derive(Subcommand)]
enum Command {
    /// Display image metadata
    Info { path: PathBuf },
}

fn main() {
    let cli = Cli::parse();
    match cli.command {
        Command::Info { path } => {
            let reader = match VhdxReader::open(&path) {
                Ok(r) => r,
                Err(e) => {
                    eprintln!("error: {e}");
                    process::exit(1);
                }
            };

            let size = reader.virtual_disk_size();
            let sector = reader.logical_sector_size();
            let mib = size as f64 / (1024.0 * 1024.0);

            let file_name = path
                .file_name()
                .map(|n| n.to_string_lossy().into_owned())
                .unwrap_or_default();

            println!("File:              {file_name}");
            println!("Format:            VHDX v1 (dynamic)");
            println!(
                "Virtual disk size: {} bytes ({mib:.2} MiB)",
                fmt_commas(size)
            );
            println!("Logical sectors:   {sector} bytes");
        }
    }
}