use clap::Parser;

/// Clap is great! Even though we don't have many command line arguments
/// yet, this is just really neat.
#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct CommandLineArguments {
    /// Optional output file name
    #[clap(short, long)]
    output: Option<String>,

    /// The file to parse
    file: String,
}

fn main() {
    let args = CommandLineArguments::parse();
    let mut compiler = ngr::Compiler::default();

    let output_file = args.output.unwrap_or("output.o".to_string());

    if let Some(bytes) = compiler.compile(&args.file) {
        std::fs::write(&output_file, bytes)
            .unwrap_or_else(|x| eprintln!("Could not write to file {}: {}", output_file, x));
    }
}