rawarray 0.1.4

simple file format for retrievably storing n-dimensional arrays
Documentation 
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//! Command line utility for manipulating `RawArray` files.

use rawarray::RawArrayFile;
use std::env;
use std::error::Error;
use std::result::Result;

fn print_usage() {
    println!("Usage:");
    println!("   ra <head|flags|eltype|elbyte|size|ndims|dims|data> file.ra");
    println!("   ra reshape file.ra dim0 dim1 dim2 ...");
    println!("RawArray file tool");
}

fn main() -> Result<(), Box<dyn Error>> {
    let mut args = env::args();
    if args.len() < 3 {
        print_usage();
    } else {
        let command = args.nth(1).unwrap();
        let filename = args.next().unwrap();
        let mut r = RawArrayFile::valid_open(&filename)?;
        match command.as_ref() {
            "head" => {
                let _magic = r.u64()?;
                println!("flags: {:b}", r.u64()?);
                println!("eltype: {}", r.u64()?);
                println!("elbyte: {}", r.u64()?);
                println!("size: {}", r.u64()?);
                let ndims = r.u64()?;
                println!("ndims: {}", ndims);
                println!("dims: ");
                for _ in 0..ndims {
                    println!("\t- {}", r.u64()?);
                }
            }
            "flags" => println!("{:x}", r.u64_at(8)?),
            "eltype" => println!("{}", r.u64_at(16)?),
            "elbyte" => println!("{}", r.u64_at(24)?),
            "size" => println!("{}", r.u64_at(32)?),
            "ndims" => println!("{}", r.u64_at(40)?),
            "dims" => {
                r.seek(40)?;
                let ndims = r.u64()?;
                for _ in 0..ndims {
                    print!("{} ", r.u64()?)
                }
                println!();
            }
            "data" => {
                let ndims = r.u64_at(40)?;
                println!("{}", 40 + ndims * 8);
            }
            "reshape" => {
                // TODO
            }
            _ => {
                print_usage();
            }
        }

    }

    Ok(())
}