Function walk

src/global.rs:315–333

(p: &Path, acc: &mut u64)

/// Returns the total size in bytes of every file under `dir`. Best-effort.
pub(crate) fn tracedecay_dir_size(dir: &Path) -> u64 {
    fn walk(p: &Path, acc: &mut u64) {
        let Ok(entries) = std::fs::read_dir(p) else {
            return;
        };
        for entry in entries.flatten() {
            // One stat per entry instead of file_type() + metadata():
            // `metadata()` already carries the file-type bits, so calling
            // both means a redundant syscall on filesystems that don't
            // cache the dirent stat.
            let Ok(meta) = entry.metadata() else {
                continue;
            };
            if meta.is_dir() {
                walk(&entry.path(), acc);
            } else if meta.is_file() {
                *acc = acc.saturating_add(meta.len());
            }
        }
    }
    let mut total = 0u64;
    walk(dir, &mut total);
    total