Adds untested manual conversion command

src/documents/management/commands/convert_thumbnails.py

@@ -0,0 +1,76 @@
+import logging
+import shutil
+import tempfile
+import time
+from pathlib import Path
+
+from django.core.management.base import BaseCommand
+from documents.models import Document
+from documents.parsers import run_convert
+
+
+logger = logging.getLogger("paperless.management.convert_thumbnails")
+
+
+class Command(BaseCommand):
+
+    help = """
+        Converts existing PNG thumbnails into
+        WebP format.
+    """.replace(
+        "    ",
+        "",
+    )
+
+    def handle(self, *args, **options):
+
+        self.stdout.write("Converting all PNG thumbnails to WebP")
+
+        start = time.time()
+
+        documents = Document.objects.all()
+
+        for document in documents:
+            existing_thumbnail = Path(document.thumbnail_path)
+
+            if existing_thumbnail.suffix == "png":
+
+                self.stdout.write(f"Converting thumbnail: {existing_thumbnail}")
+
+                converted_thumbnail = Path(tempfile.mkstemp(suffix=".webp"))
+
+                try:
+                    run_convert(
+                        density=300,
+                        scale="500x5000>",
+                        alpha="remove",
+                        strip=True,
+                        trim=False,
+                        auto_orient=True,
+                        input_file=f"{existing_thumbnail}[0]",
+                        output_file=str(converted_thumbnail),
+                    )
+
+                    self.stdout.write("Replacing existing thumbnail")
+
+                    if converted_thumbnail.exists():
+                        shutil.copy(converted_thumbnail, existing_thumbnail)
+
+                    self.stdout.write(
+                        self.style.SUCCESS("Conversion to WebP completed"),
+                    )
+
+                except Exception as e:
+                    self.stderr.write(
+                        self.style.ERROR(
+                            f"Error converting thumbnail (existing will be kept): {e}",
+                        ),
+                    )
+                finally:
+                    if converted_thumbnail.exists():
+                        converted_thumbnail.unlink()
+
+        end = time.time()
+        duration = end - start
+
+        self.stdout.write(f"Conversion completed in {duration:.3f}s")