draw the rest of the owl

app/routes/topics.py

@@ -1,11 +1,13 @@
 from flask import (
     Blueprint, render_template, request, redirect, url_for, flash, session,
-    abort,
+    abort, current_app
     )
 from .users import login_required, mod_only, get_active_user, is_logged_in
 from ..models import Users, Topics, Threads, Subscriptions
 from ..constants import InfoboxKind
+from ..lib.render_atom import render_atom_template
 from slugify import slugify
+from app import cache
 import time
 import math
 
@@ -80,10 +82,27 @@ def topic(slug):
         subscriptions = subscriptions,
         topic = target_topic,
         current_page = page,
-        page_count = page_count
+        page_count = page_count,
+        __feedlink = url_for('.topic_atom', slug=slug, _external=True),
+        __feedtitle = f'latest threads in {target_topic.name}',
     )
 
 
+@bp.get('/<slug>/feed.atom')
+@cache.cached(timeout=10 * 60, unless=lambda: current_app.config.get('DEBUG', False))
+def topic_atom(slug):
+    target_topic = Topics.find({
+        "slug": slug
+    })
+    if not target_topic:
+        abort(404) # TODO throw an atom friendly 404
+        return
+
+    threads_list = target_topic.get_threads_with_op_rss()
+
+    return render_atom_template('topics/topic.atom', threads_list=threads_list, target_topic=target_topic)
+
+
 @bp.get("/<slug>/edit")
 @login_required
 @mod_only(".topic", slug = lambda slug: slug)