forked from AbleOS/holey-bytes
95 lines
2.3 KiB
Rust
95 lines
2.3 KiB
Rust
mod utils;
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use {
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crate::utils::IterExt,
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std::{
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fs::File,
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io::{self, BufRead, BufReader, BufWriter, Seek, Write},
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path::Path,
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},
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};
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fn root() -> &'static Path {
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Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap()
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}
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fn main() -> io::Result<()> {
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let args = std::env::args().collect::<Vec<_>>();
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match args[0].as_str() {
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"fmt" => fmt(args[1] == "-r" || args[1] == "--renumber"),
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_ => Ok(()),
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}
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}
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pub fn fmt(renumber: bool) -> io::Result<()> {
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let mut file = File::options()
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.read(true)
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.write(true)
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.open(crate::root().join("hbbytecode/instructions.in"))?;
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// Extract records
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let reader = BufReader::new(&file);
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let mut recs = vec![];
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let mut lens = [0_usize; 4];
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for rec in reader.split(b';').filter_map(|r| {
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r.map(|ln| {
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let s = String::from_utf8_lossy(&ln);
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let s = s.trim_matches('\n');
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if s.is_empty() {
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return None;
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}
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s.split(',').map(|s| Box::<str>::from(s.trim())).collect_array::<4>().map(Ok::<_, ()>)
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})
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.transpose()
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}) {
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let rec = rec?.expect("Valid record format");
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for (current, next) in lens.iter_mut().zip(rec.iter()) {
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*current = (*current).max(next.len());
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}
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recs.push(rec);
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}
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// Clear file!
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file.set_len(0)?;
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file.seek(std::io::SeekFrom::Start(0))?;
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let mut writer = BufWriter::new(file);
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let ord_opco_len = digit_count(recs.len()) as usize;
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for (n, rec) in recs.iter().enumerate() {
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// Write opcode number
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if renumber {
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let n = format!("{n:#04X}");
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write!(writer, "{n}, {}", padding(ord_opco_len, &n))?;
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} else {
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write!(writer, "{}, {}", rec[0], padding(lens[0], &rec[0]))?;
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}
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// Write other fields
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writeln!(
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writer,
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"{}, {}{},{} {}{};",
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rec[1],
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padding(lens[1], &rec[1]),
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rec[2],
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padding(lens[2], &rec[2]),
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rec[3],
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padding(lens[3], &rec[3]),
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)?;
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}
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Ok(())
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}
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fn padding(req: usize, s: &str) -> Box<str> {
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" ".repeat(req.saturating_sub(s.len())).into()
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}
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#[inline]
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fn digit_count(n: usize) -> u32 {
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n.checked_ilog10().unwrap_or(0) + 1
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}
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