Function require_str

atomic-canonical/src/lift.rs:251–253

(fm: &Map<String, Value>, key: &str)

}

fn require_str(fm: &Map<String, Value>, key: &str) -> Result<String> {
    opt_str(fm, key).ok_or_else(|| CanonicalError::Lift(format!("frontmatter missing '{key}'")))
}

fn opt_str(fm: &Map<String, Value>, key: &str) -> Option<String> {
    match fm.get(key) {