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use anyhow::{bail, Context, Result};
use clap::Parser as ClapParser;
use std::fs::File;
use std::io::{self, Read, Write};
use std::path::Path;
use xixanta::assembler::Assembler;
use xixanta::mapping::{Mapping, EMPTY, NROM, NROM65};
/// Assembler for the 6502 microprocessor that targets the NES/Famicom.
#[derive(ClapParser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
/// Assemble the instructions given on this file. The standard input is used
/// when this argument is not given.
file: Option<String>,
/// Linker configuration to be used. Defaults to 'nrom'.
#[arg(short = 'c', long)]
config: Option<String>,
/// Place the output into the given <OUT> file. Ignored if the `stdout` flag
/// is provided. Defaults to `out.nes`.
#[arg(short = 'o', long)]
out: Option<String>,
/// Spit the output into the standard output instead. This ignores any given
/// `out` flag. Disabled by default.
#[arg(long, default_value_t = false)]
stdout: bool,
}
fn main() -> Result<()> {
let args = Args::parse();
// Select the input stream and the current working directory.
let input: Box<dyn Read>;
let working_directory = match &args.file {
Some(file) => {
let path = Path::new(file);
if !path.is_file() {
bail!("Input file must be a valid file");
}
input = Box::new(File::open(file)?);
path.parent()
.with_context(|| String::from("Failed to find directory for given file"))?
}
None => {
input = Box::new(std::io::stdin());
&std::env::current_dir()
.with_context(|| String::from("Could not fetch current directory"))?
}
};
// Select the output stream.
let mut output: Box<dyn Write> = if args.stdout {
Box::new(io::stdout())
} else {
Box::new(File::create(args.out.unwrap_or(String::from("out.nes")))?)
};
// Select the linker configuration.
let mapping: Vec<Mapping> = match args.config {
Some(c) => match c.to_lowercase().as_str() {
"empty" => EMPTY.to_vec(),
"nrom" => NROM.to_vec(),
"nrom65" => NROM65.to_vec(),
_ => {
println!("Unnown linker configuration '{}'", c);
std::process::exit(1);
}
},
None => NROM.to_vec(),
};
// And assemble.
let mut assembler = Assembler::new(mapping);
match assembler.assemble(working_directory.to_path_buf(), input) {
Ok(bundles) => {
for b in bundles {
for i in 0..b.size {
output.write_all(&[b.bytes[i as usize]])?;
}
}
}
Err(errors) => {
for err in errors {
println!("{}", err);
}
std::process::exit(1);
}
}
Ok(())
}
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