Report errors with line and column

use oneyaml::{ColumnUnit, Document, LineIndex};
use serde::Deserialize;
 
#[derive(Debug, Deserialize)]
struct Config {
    #[allow(dead_code)]
    port: u16,
}
 
fn main() {
    // A typed read: the error has a code, a position and a path.
    let src = "port: 99999\n";
    let err = oneyaml::from_str::<Config>(src).unwrap_err();
    let at = err.location().expect("a position");
    println!("{} at line {}, column {}", err.code(), at.line(), at.column());
    println!("path: {}", err.path().map(|p| p.to_string()).unwrap_or_default());
    println!("one line: {err}");
 
    // Or the rustc-style snippet, for a terminal.
    print!("{}", err.render(src));
 
    // Every error in a file, not only the first.
    let src = "name: web\nname: api\nports: [80, 443\n";
    let parsed = Document::parse_recovering(src);
    let lines = LineIndex::new(src);
    for d in parsed.diagnostics() {
        let at = lines.line_col(d.primary.span.start, ColumnUnit::Char).expect("in bounds");
        println!("{}:{}: {} {}", at.line + 1, at.column + 1, d.code, d.message);
    }
}

Y3001 at line 1, column 7
path: port
one line: integer 99999 is out of range for u16 at port (1:7)
error[Y3001]: integer 99999 is out of range for u16
 --> 1:7
  |
1 | port: 99999
  |       ^^^^^
  |
  = path: port
2:1: Y1013 duplicate key `name`
4:1: Y0022 flow collection is not closed