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use clap::Parser as ClapParser;
use std::fs::File;
use std::io::{self, Write};
use std::path::Path;
use xixanta::assembler::assemble;
use xixanta::SourceInfo;
/// 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.
file: String,
/// Linker configuration to be used. This configuration can be an identifier
/// for the configurations already baked in into this application, or it can
/// be a file path to a configuration of your choosing. See the
/// documentation for more information on this format. 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>,
/// Treat warnings as errors.
#[arg(short = 'W', value_name = "Error")]
w: 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,
}
// Print the given `message` and exit(1).
fn die(message: String) {
eprintln!("error: {}", message);
std::process::exit(1);
}
fn main() {
let args = Args::parse();
// Select the input stream and build the source object.
let path = Path::new(&args.file);
let Ok(input) = File::open(path) else {
die(format!("failed to open the given file '{}'", &args.file));
return;
};
let source = match path.parent() {
Some(parent) => SourceInfo {
directory: parent.to_path_buf(),
name: path.file_name().unwrap().to_str().unwrap().to_string(),
},
None => {
die("failed to find directory for the given file".to_string());
return;
}
};
// Select the output stream.
let (mut output, output_name): (Box<dyn Write>, &str) = if args.stdout {
(Box::new(io::stdout()), "<stdout>")
} else {
let name = args.out.unwrap_or(String::from("out.nes"));
match File::create(&name) {
Ok(f) => (Box::new(f), args.file.as_str()),
Err(_) => {
die(format!("could not create file '{}'", name));
return;
}
}
};
// Check if warnings have to be treated as errors.
let warn_as_errors = match args.w {
Some(value) => {
if value.to_lowercase() != "error" {
die("the '-W' flag can only be used as '-Werror'".to_string());
return;
} else {
true
}
}
None => false,
};
// And assemble.
let mut error_count = 0;
let res = assemble(
input,
args.config.unwrap_or("nrom".to_string()).as_str(),
source,
);
// Print warnings and errors first, while also computing the amount of them
// that exists.
for warning in res.warnings {
if warn_as_errors {
eprintln!("error: {}", warning);
error_count += 1;
} else {
eprintln!("warning: {}", warning);
}
}
for error in res.errors {
eprintln!("error: {}", error);
error_count += 1;
}
// If everything was right, just deliver the bundles.
if error_count == 0 {
for b in res.bundles {
for i in 0..b.size {
if let Err(e) = output.write_all(&[b.bytes[i as usize]]) {
eprintln!("error: could not write result in '{}': {}", output_name, e);
std::process::exit(1);
}
}
}
}
std::process::exit(error_count);
}
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