Bnot : split large copies into pieces.

copienator/commands/annotating_by_label.py

@@ -23,13 +23,12 @@ from copienator import (
     workspace_from_args,
 )
 from copienator.annotation_data import load_annotation_data
+from copienator.annotation_documents import MAX_HEIGHT_PX
 from copienator.commands import annotating, annotating_with_checks
 from copienator.commands.import_annotations import clear_import_directory
 from copienator.filesystem import staged_directory
 from copienator.utils import natural_key
 
-MAX_HEIGHT_PX = 32000
-
 
 def render_item(item):
     student_id, label, content = item
@@ -65,10 +64,10 @@ def save_batch(batch, prefix, group_id, output_root: Path) -> None:
     print(f"Generating group PDF: {prefix} G{group_id} ({len(batch)} elements)")
     max_width = max(item[2].width for item in batch)
     total_height = sum(item[2].height for item in batch)
-    if total_height > MAX_HEIGHT_PX:
+    if total_height > MAX_HEIGHT_PX and len({item[0] for item in batch}) > 1:
         raise CliError(
             f"{prefix} G{group_id} would be {total_height} px high; "
-            f"the maximum is {MAX_HEIGHT_PX} px."
+            f"only a single student's block may exceed {MAX_HEIGHT_PX} px."
         )
     concatenated = Image.new("RGB", (max_width, total_height), "white")
     draw = ImageDraw.Draw(concatenated)
@@ -293,12 +292,11 @@ def split_batches(rendered):
         student_height = sum(item[2].height for item in student_items)
 
         if student_height > MAX_HEIGHT_PX:
-            labels = ", ".join(item[1] for item in student_items)
-            raise CliError(
-                f"Copie{student_id} ({labels}) is {student_height} px high; "
-                f"one student's labels cannot be split across groups and the "
-                f"maximum group height is {MAX_HEIGHT_PX} px."
-            )
+            # Oversized blocks remain intact in a group of their own.
+            batches.append(list(student_items))
+            heights.append(student_height)
+            index = end
+            continue
 
         # Reuse space in earlier groups, keeping each student's block intact.
         for batch_index, height in enumerate(heights):