finish that a tag in topics view

app/routes/threads.py

@@ -13,6 +13,20 @@ import time
 bp = Blueprint("threads", __name__, url_prefix = "/threads/")
 
 
+def get_post_url(post_id, _anchor=False):
+    post = Posts.find({'id': post_id})
+    if not post:
+        return ""
+
+    thread = Threads.find({'id': post.thread_id})
+
+    res = url_for('threads.thread', slug=thread.slug, after=post_id)
+    if not _anchor:
+        return res
+
+    return f"{res}#post-{post_id}"
+
+
 @bp.get("/<slug>")
 def thread(slug):
     POSTS_PER_PAGE = 10