pub fn add_headers_recursively(
root: &Path,
path_predicate: impl Fn(&Path) -> bool,
header: Header<impl HeaderChecker>,
) -> Result<Vec<PathBuf>, AddHeadersRecursivelyError>Expand description
Add the provided header to any file in root that matches path_predicate and that doesn’t
already have a header as determined by checker.
Returns a list of paths that had headers added.