Track File Changes with Version History in Python

import hashlib, json, os, shutil, time
from pathlib import Path

class FileTracker:
    def __init__(self, history_file="file_history.json"):
        self.history_file = Path(history_file)
        self.history = self._load_history()

    def _load_history(self):
        if self.history_file.exists():
            return json.loads(self.history_file.read_text())
        return {}

    def _save_history(self):
        self.history_file.write_text(json.dumps(self.history, indent=2))

    def _file_hash(self, path):
        return hashlib.sha256(Path(path).read_bytes()).hexdigest()

    def track(self, path):
        path = Path(path)
        if not path.exists():
            print(f"Error: {path} does not exist.")
            return
        file_hash = self._file_hash(path)
        versions = self.history.get(str(path), [])
        if not versions or versions[-1]["hash"] != file_hash:
            version_path = path.with_name(f"{path.stem}_v{len(versions)+1}{path.suffix}")
            shutil.copy2(path, version_path)
            entry = {"version": len(versions)+1, "hash": file_hash, "timestamp": time.time(), "file": str(version_path)}
            versions.append(entry)
            self.history[str(path)] = versions
            self._save_history()
            print(f"Version {entry['version']} saved as {version_path}")
        else:
            print(f"No changes detected for {path}")

if __name__ == "__main__":
    ft = FileTracker()
    ft.track("test.txt")