cropping summaries

copienator/commands/crop_margins.py

@@ -83,6 +83,26 @@ def process_copies(files: list[Path], staging: Path, workers: int) -> list[dict]
                   key=lambda row: (order[row["file"]], row["page"]))
 
 
+def crop_statistics(records: list[dict]) -> tuple[int, float, int]:
+    """Return cropped page count, their mean removed percentage, and >30% count."""
+    percentages: list[float] = []
+    for record in records:
+        removed_mm = record["top_removed_mm"] + record["bottom_removed_mm"]
+        if removed_mm <= 0:
+            continue
+        x0, y0, x1, y1 = record["original_cropbox"]
+        original_height_points = (
+            x1 - x0 if record.get("rotation", 0) % 180 else y1 - y0
+        )
+        if original_height_points <= 0:
+            continue
+        original_height_mm = original_height_points * 25.4 / 72
+        percentages.append(min(100.0, removed_mm / original_height_mm * 100))
+    mean_percentage = sum(percentages) / len(percentages) if percentages else 0.0
+    over_thirty = sum(percentage > 30 for percentage in percentages)
+    return len(percentages), mean_percentage, over_thirty
+
+
 def run(workspace: EvaluationWorkspace, target: Path, *, workers: int = 5) -> ExitCode:
     if workers < 1:
         raise CliError("Le nombre de traitements parallèles doit être positif.",
@@ -109,9 +129,14 @@ def run(workspace: EvaluationWorkspace, target: Path, *, workers: int = 5) -> Ex
         (backup/"report.json").write_text(json.dumps(records, ensure_ascii=False, indent=2),
                                         encoding="utf-8")
         print(f"Sauvegarde des PDF non rognés : {originals}", flush=True)
-    cropped = sum(row["top_removed_mm"]+row["bottom_removed_mm"] > 0 for row in records)
+    cropped, mean_percentage, over_thirty = crop_statistics(records)
     print(f"Terminé : {cropped}/{len(records)} pages rognées ; "
           f"{len(files)} PDF remplacés dans Copies.", flush=True)
+    print(
+        f"Rognage moyen des pages modifiées : {mean_percentage:.1f} % ; "
+        f"{over_thirty} page(s) rognée(s) de plus de 30 %.",
+        flush=True,
+    )
     return ExitCode.SUCCESS