Mastodawn

a self-highlighting main.rs that leaves the code valid rust
:)
// version: 5.3.0
use syntect::{
  easy::HighlightLines,
  highlighting::{Style, ThemeSet},
  parsing::SyntaxSet,
  util::LinesWithEndings,
};

fn main() {
  let ps = SyntaxSet::load_defaults_newlines();
  let ts = ThemeSet::load_defaults();

  let mut h = HighlightLines::new(
    ps.find_syntax_by_extension("rs").unwrap(),
    &ts.themes["base16-eighties.dark"],
  );

  let s = std::fs::read_to_string("main.rs").unwrap();

  for line in LinesWithEndings::from(&s) {
    let ranges: Vec<(Style, &str)> =
      h.highlight_line(line, &ps).unwrap();

    let line_without_ending =
      line.trim_end_matches('\n');

    print!("{line_without_ending}//\x1b[;G");

    for (style, mut s) in ranges {
      s = s.trim_end_matches('\n');
      let (r, g, b) = (
        style.foreground.r,
        style.foreground.g,
        style.foreground.b,
      );
      print!("\x1b[38;2;{r};{g};{b}m{s}");
    }

    println!("  "); // erases the comment
  }
}