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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::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. The standard input is used
/// when this argument is not given.
file: Option<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,
}
fn main() -> Result<()> {
let args = Args::parse();
// Select the input stream and the current working directory.
let input: Box<dyn Read>;
let source_info = 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)?);
SourceInfo {
directory: path
.parent()
.with_context(|| String::from("Failed to find directory for given file"))?
.to_path_buf(),
name: path.file_name().unwrap().to_str().unwrap().to_string(),
}
}
None => {
input = Box::new(std::io::stdin());
SourceInfo {
directory: std::env::current_dir()
.with_context(|| String::from("Could not fetch current directory"))?
.to_path_buf(),
name: "<stdin>".to_string(),
}
}
};
// 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")))?)
};
// Check if warnings have to be treated as errors.
let warn_as_errors = match args.w {
Some(value) => {
if value.to_lowercase() != "error" {
bail!("The '-W' flag can only be used as '-Werror'");
} else {
true
}
}
None => false,
};
// Select the linker configuration.
let config = args.config.unwrap_or("nrom".to_string());
// And assemble.
let mut error_count = 0;
let res = assemble(input, config.as_str(), source_info);
// 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 {
output.write_all(&[b.bytes[i as usize]])?;
}
}
}
std::process::exit(error_count);
}
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