- Check file mtime before and after hashing; error if they differ
- Store file's mtime as sumtime instead of wall-clock time
- Use fresh stat for BytesProcessed to get accurate count
This fixes a TOCTOU race where a file could be modified between
hashing and writing the xattr, resulting in a stale checksum.
It also makes sum update comparisons semantically correct by
comparing file mtime against stored mtime rather than wall-clock time.
countFiles and countFilesMultiple now return errors instead of silently
ignoring them. This ensures that issues like non-existent paths or
permission errors are reported early rather than showing a misleading
progress bar with 0 total.
Instead of creating a new progress bar for each path, count total files
across all paths upfront and use a single unified progress bar. This
provides clearer UX when processing multiple directories.
When using "-" to read paths from stdin, if stdin is empty or contains
only blank lines, return an explicit error instead of silently succeeding
with no work done.
filepath.Walk uses Lstat, so symlinks are reported with ModeSymlink set,
never ModeDir. The info.IsDir() check was always false, making the
filepath.SkipDir branch unreachable dead code.
- Add -q/--quiet flag to suppress all output except errors
- Add progress bar with 250ms refresh, file count, and ETA display
- Print summary report to stderr on completion (files processed, skipped, failed, bytes, duration)
- Support reading paths from stdin with "-" argument (e.g., find | attrsum sum add -)
- Update README with new features and updated TODO section
- Change sum add, sum update, check, and clear to accept 1+ paths
- Update README usage examples to show multiple path support
- Add TODO section with planned future improvements
