pub const DEFAULT_IGNORE: [&[u8]; 2] = [b".git", b".DS_Store"];

        let mut pristine_dir = cur.clone();
        pristine_dir.push(DOT_DIR);
        pristine_dir.push(PRISTINE_DIR);

        let pristine_dir = {
            let mut base = cur.clone();
            base.push(DOT_DIR);
            base.push(PRISTINE_DIR);
            base
        };

            let mut changes_dir = cur.clone();
            changes_dir.push(DOT_DIR);
            changes_dir.push(CHANGES_DIR);

            init_dot_ignore(cur.clone())?;
            let changes_dir = {
                let mut base = cur.clone();
                base.push(DOT_DIR);
                base.push(CHANGES_DIR);
                base
            };

/// Create and populate an initial `.ignore` file for the repository.
/// The default elements are defined in the constant [`DEFAULT_IGNORE`].
fn init_dot_ignore(base_path: std::path::PathBuf) -> Result<(), anyhow::Error> {
    use std::io::Write;
    let dot_ignore_path = {
        let mut base = base_path.clone();
        base.push(".ignore");
        base
    };
    let mut dot_ignore = std::fs::OpenOptions::new()
        .read(true)
        .write(true)
        .create(true)
        .open(dot_ignore_path)?;
    for default_ignore in DEFAULT_IGNORE {
        dot_ignore.write(default_ignore)?;
        dot_ignore.write(b"\n")?;
    }
    Ok(())
}