add migration script

contrib/sqlite_to_posts.py

@@ -0,0 +1,46 @@
+import os
+import re
+import shutil
+from pathlib import Path
+
+from django.core.management.base import BaseCommand
+
+from attachments.models import Attachment
+from articles.models import Article
+
+
+class Command(BaseCommand):
+    def handle(self, *_args, **_options) -> None:
+        base_folder="/app/db/posts"
+        os.makedirs(base_folder, exist_ok=True)
+        for article in Article.objects.all():
+            self.stdout.write(f"Processing {article.title}...")
+            tags = map(repr, article.tags.all().values_list("name", flat=True))
+            date = article.published_at or article.created_at
+            lines = [
+                "---",
+                f'title: "{article.title}"',
+                f"tags: [{', '.join(tags)}]",
+                f"date: {date.isoformat()}",
+                f'aliases: ["/{article.slug}"]',
+                "---",
+            ]
+            folder = f"{base_folder}/{article.slug}"
+            os.makedirs(folder, exist_ok=True)
+            attachments = set(re.findall(r"/attachments/(\d+)", article.content))
+            attachments = Attachment.objects.filter(id__in=attachments)
+            content = article.content.replace("\r", "")
+            content = re.sub(r"!\[([^]]*)]\(/attachments/(\d+)[^)]*\)", r"![\1](\2.__SUFFIX__)", content)
+            content = re.sub(r"\{:[^}]*}", "", content)
+            for attachment in attachments:
+                src = Path(attachment.original_file.path)
+                dst = (Path(folder) / str(attachment.pk)).with_suffix(src.suffix)
+                shutil.copy(src, dst)
+                self.stdout.write(str(dst))
+                content = content.replace(f"{attachment.pk}.__SUFFIX__", f"{attachment.pk}{src.suffix}")
+            with open(f"{folder}/index.md", "w") as f:
+                f.write("\n".join(lines))
+                f.write("\n")
+                f.write(content)
+                f.write("\n")
+        self.stdout.write(self.style.SUCCESS("Successfully wrote all posts."))