Function remove_empty_ancestors

atomic-repository/src/repository/split.rs:45–60

Remove now-empty parent directories of a just-deleted path, deepest-first. `std::fs::remove_dir` only succeeds on empty directories, so this is safe: a directory that still holds files is left untouched.

(root: &std::path::Path, removed_rel_path: &str)

/// `std::fs::remove_dir` only succeeds on empty directories, so this is safe:
/// a directory that still holds files is left untouched.
fn remove_empty_ancestors(root: &std::path::Path, removed_rel_path: &str) {
    let mut ancestor = std::path::Path::new(removed_rel_path).parent();
    while let Some(dir) = ancestor {
        if dir.as_os_str().is_empty() || dir == std::path::Path::new(".") {
            break;
        }
        let abs = root.join(dir);
        if abs.is_dir() {
            // Fails harmlessly if the directory is not empty.
            if std::fs::remove_dir(&abs).is_err() {
                break;
            }
        }
        ancestor = dir.parent();
    }
}

/// Options controlling a view split.
#[derive(Debug, Clone)]