magi-code 0.80.1

use std::{env, fs, path::PathBuf};

fn main() {
    let version = env::var("CARGO_PKG_VERSION").expect("Cargo supplies package version");
    let source = PathBuf::from("docs/features/release-notes").join(format!("{version}.md"));
    println!("cargo:rerun-if-changed=docs/features/release-notes");
    let notes = match fs::read_to_string(&source) {
        Ok(notes) => {
            assert!(
                notes.len() <= 16 * 1024,
                "welcome release notes exceed 16 KiB"
            );
            assert!(
                !notes.chars().any(|c| c.is_control() && c != '\n'),
                "release notes contain control characters"
            );
            notes
        }
        Err(error) if error.kind() == std::io::ErrorKind::NotFound => String::new(),
        Err(error) => panic!("cannot read {}: {error}", source.display()),
    };
    fs::write(
        PathBuf::from(env::var_os("OUT_DIR").unwrap()).join("welcome-release-notes.txt"),
        notes,
    )
    .expect("write bundled release notes");
}