Add code snippets to long-form stories.

app.py

@@ -233,16 +233,22 @@ def save_inline_images(post_id):
 def article_blocks(body, images):
     image_map = {str(index): image for index, image in enumerate(images, start=1)}
     blocks = []
-    marker = re.compile(r"\[\[image:(\d+)\]\]")
+    marker = re.compile(
+        r"```(?P<language>[A-Za-z0-9][A-Za-z0-9_-]*)?[ \t]*\r?\n(?P<code>.*?)(?:\r?\n)?```|\[\[image:(?P<image>\d+)\]\]",
+        re.DOTALL,
+    )
     cursor = 0
     for match in marker.finditer(body):
         if match.start() > cursor:
             blocks.append(("text", body[cursor:match.start()]))
-        image = image_map.get(match.group(1))
-        if image is not None:
-            blocks.append(("image", image))
+        if match.group("code") is not None:
+            blocks.append(("code", {"language": match.group("language") or "text", "content": match.group("code")}))
         else:
-            blocks.append(("text", match.group(0)))
+            image = image_map.get(match.group("image"))
+            if image is not None:
+                blocks.append(("image", image))
+            else:
+                blocks.append(("text", match.group(0)))
         cursor = match.end()
     if cursor < len(body):
         blocks.append(("text", body[cursor:]))