checksmix 0.2.0

A simplified MIX simulator - Donald Knuth's hypothetical computer for teaching and learning assembly language programming.
Documentation 
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/// MMIX Assembler - Compile .mms assembly files to .mmo object code
use checksmix::MMixAssembler;
use std::env;
use std::fs;
use std::path::Path;
use std::process;

fn main() {
    let args: Vec<String> = env::args().collect();

    if args.len() < 2 || args.len() > 3 {
        eprintln!("Usage: {} <input.mms> [output.mmo]", args[0]);
        eprintln!("\nAssembles MMIX assembly language (.mms) to object code (.mmo)");
        eprintln!("\nIf output file is not specified, uses input basename with .mmo extension");
        process::exit(1);
    }

    let input_file = &args[1];
    let output_file = if args.len() == 3 {
        args[2].clone()
    } else {
        // Replace extension with .mmo
        let path = Path::new(input_file);
        path.with_extension("mmo")
            .to_str()
            .unwrap_or("output.mmo")
            .to_string()
    };

    // Read the input file
    let source = fs::read_to_string(input_file).unwrap_or_else(|err| {
        eprintln!("Error reading '{}': {}", input_file, err);
        process::exit(1);
    });

    println!("Assembling: {}", input_file);

    // Parse the assembly
    let mut assembler = MMixAssembler::new(&source);
    assembler.parse();

    // Generate object code
    let object_code = assembler.generate_object_code();

    println!("Generated {} bytes of object code", object_code.len());

    // Write the output file
    fs::write(&output_file, &object_code).unwrap_or_else(|err| {
        eprintln!("Error writing '{}': {}", output_file, err);
        process::exit(1);
    });

    println!("Output written to: {}", output_file);
}