the script demands it

nari-comments.rs

// SPDX-License-Identifier: CC0-1.0

// Be good to her.

use std::io::{self, prelude::*, BufReader, BufWriter};
use std::fs::File;
use std::env;
use std::string::String;

fn main() -> io::Result<()> {
	let script_name = env::args().nth(1);
	if script_name.is_none() || !script_name.clone().unwrap().contains(".rpy") {
		return Err(io::Error::new(io::ErrorKind::Other, "Please provide a Ren'Py script (.rpy) as an argument"));
	}
	let script_name = script_name.unwrap();
    let script_in = File::open(&script_name)?;
    let script_in = BufReader::new(script_in);
    let script_out = File::create(script_name.replacen(".rpy", ".rpy.decoded", 1))?;
    let mut script_out = BufWriter::new(script_out);
	
    for line in script_in.lines() {
		let line = line?;
		if let Some(pos) = line.find("#") {
			let (code, comment) = line.split_at(pos + 1);
			let comment: Vec<char> = comment.chars()
				.filter(|c| *c != ' ')
				.collect();
			let result: Result<Vec<u8>, _> = comment
				.chunks(2)
				.map(|hex: &[char]| u8::from_str_radix(hex.iter().collect::<String>().as_str(), 16))
				.collect(); // turns an iterator of Results into a Result of the collected type
			match result.ok().and_then(|x| String::from_utf8(x).ok()) {
				Some(comment) => {
					writeln!(script_out, "{}[nari] {}", code, comment)?;
				}
				None => {
					writeln!(script_out, "{}", line)?;
				}
			}
		} else {
			writeln!(script_out, "{}", line)?;
		}
    }
    
    script_out.flush()
}