Add generate_preview_images command

bookwyrm/management/commands/generate_preview_images.py

@@ -0,0 +1,48 @@
+""" Generate preview images """
+import sys
+
+from django.core.management.base import BaseCommand
+
+from bookwyrm import activitystreams, models, settings, preview_images
+
+
+def generate_preview_images():
+    """generate preview images"""
+    print("   | Hello! I will be generating preview images for your instance.")
+    print("🧑‍🎨 ⎨ This might take quite long if your instance has a lot of books and users.")
+    print("   | ✧ Thank you for your patience ✧")
+
+    # Site
+    sys.stdout.write("   → Site preview image: ")
+    preview_images.generate_site_preview_image_task()
+    sys.stdout.write(" OK 🖼\n")
+
+
+    # Users
+    users = models.User.objects.filter(
+        local=True,
+        is_active=True,
+    )
+    sys.stdout.write("   → User preview images ({}): ".format(len(users)))
+    for user in users:
+        preview_images.generate_user_preview_image_task(user.id)
+        sys.stdout.write(".")
+    sys.stdout.write(" OK 🖼\n")
+
+    # Books
+    books = models.Book.objects.select_subclasses().filter()
+    sys.stdout.write("   → Book preview images ({}): ".format(len(books)))
+    for book in books:
+        preview_images.generate_edition_preview_image_task(book.id)
+        sys.stdout.write(".")
+    sys.stdout.write(" OK 🖼\n")
+
+    print("🧑‍🎨 ⎨ I’m all done! ✧ Enjoy ✧")
+
+
+class Command(BaseCommand):
+    help = "Generate preview images"
+    # pylint: disable=no-self-use,unused-argument
+    def handle(self, *args, **options):
+        """run feed builder"""
+        generate_preview_images()