Add 3.snapshot_comparator/src/snapshot_comparator/cli.py

3.snapshot_comparator/src/snapshot_comparator/cli.py

@@ -0,0 +1,52 @@
+import argparse
+import json
+import os
+from pathlib import Path
+from typing import Any
+
+from snapshot_comparator.core import compare_snapshots
+
+
+def _load_json_snapshot(path: Path) -> list[dict[str, Any]]:
+    if not path.exists():
+        raise FileNotFoundError(f"Snapshot file not found: {path}")
+    with path.open('r', encoding='utf-8') as f:
+        try:
+            data = json.load(f)
+        except json.JSONDecodeError as e:
+            raise ValueError(f"Invalid JSON in {path}: {e}")
+    if not isinstance(data, list):
+        raise TypeError(f"Expected list of snapshots, got {type(data)} in {path}")
+    return data
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(description="Vergleicht zwei Snapshot-JSON-Dateien.")
+    parser.add_argument("--before", required=True, help="Pfad zur ersten Snapshot-JSON-Datei")
+    parser.add_argument("--after", required=True, help="Pfad zur zweiten Snapshot-JSON-Datei")
+    parser.add_argument("--out", required=False, help="Optionaler Ausgabepfad für Vergleichsergebnisse")
+
+    args = parser.parse_args()
+
+    before_path = Path(args.before).resolve()
+    after_path = Path(args.after).resolve()
+    out_path = Path(args.out).resolve() if args.out else Path("output/comparison_results.json").resolve()
+
+    # Eingabevalidierung
+    assert before_path.exists() and before_path.is_file(), f"Invalid input file: {before_path}"
+    assert after_path.exists() and after_path.is_file(), f"Invalid input file: {after_path}"
+
+    snapshot1 = _load_json_snapshot(before_path)
+    snapshot2 = _load_json_snapshot(after_path)
+
+    result = compare_snapshots(snapshot1, snapshot2)
+
+    os.makedirs(out_path.parent, exist_ok=True)
+    with open(out_path, 'w', encoding='utf-8') as f:
+        json.dump(result, f, indent=2, ensure_ascii=False)
+
+    print(f"Snapshot comparison written to {out_path}")
+
+
+if __name__ == "__main__":
+    main()