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use anyhow::Result;
use clap::Parser as ClapParser;
use std::fs::File;
use std::io::{self, Read, Write};
use xixanta::assembler::Assembler;
use xixanta::instruction::Fill;
use xixanta::mapping::Segment;
/// Assembler for the 6502 microprocessor that targets the NES.
#[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>,
/// Disassemble instead of assembling. Disabled by default.
#[arg(short, long, default_value_t = false)]
disassemble: bool,
/// Place the output into the given <OUT> file. Ignored if the `stdout` flag
/// is provided. Defaults to `out.nes` when assembling, and to `out.s` when
/// disassembling.
#[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();
// TODO: provide a handier way for this.
let mut assembler = Assembler::new(vec![Segment {
name: String::from("CODE"),
start: 0x1000,
size: 10,
fill_value: Some(Fill { value: 0x00 }),
}]);
// Select the input stream.
let input: Box<dyn Read> = match args.file {
Some(file) => Box::new(File::open(file)?),
None => Box::new(std::io::stdin()),
};
// Select the output stream.
let mut output: Box<dyn Write> = if args.stdout {
Box::new(io::stdout())
} else {
match args.out {
Some(file) => Box::new(File::create(file)?),
None => Box::new(File::create(if args.disassemble {
"out.s"
} else {
"out.nes"
})?),
}
};
// After the parse operation, just print the results.
if args.disassemble {
let instructions = assembler.disassemble(input)?;
for instr in instructions {
output.write_all(instr.to_human().as_bytes())?;
output.write_all("\n".as_bytes())?;
}
} else {
let instructions = assembler.assemble(input)?;
for instr in instructions {
let bs = instr.to_bytes();
if instr.size() == 1 {
output.write_all(&[bs[0]])?;
} else if instr.size() == 2 {
output.write_all(&[bs[0], bs[1]])?;
} else {
output.write_all(&[bs[0], bs[1], bs[2]])?;
}
}
}
Ok(())
}
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