re-add rss feeds

app/templates/threads/thread.atom

@@ -0,0 +1,20 @@
+{% from 'common/macros.html' import rss_html_content %}
+{%- extends 'base.atom' -%}
+{%- block title -%}replies to {{thread.title}}{%- endblock -%}
+{%- block canonical_link -%}{{ url_for('threads.thread_by_id', thread_id=thread.id, _external=true) }}{%- endblock -%}
+{%- block content -%}
+  {%- for post in posts -%}
+  {%- set post_url = get_post_url(post.id, _anchor=true, external=true) -%}
+  <entry>
+    <title>Re: {{ thread.title | escape }}</title>
+    <link href="{{ post_url }}"/>
+    <id>{{ post_url }}</id>
+    <updated>{{ post.edited_at | iso8601 }}</updated>
+    {{ rss_html_content(post.content_rss) }}
+    <author>
+      <name>{{ post.display_name | escape }} @{{ post.username }}</name>
+      <uri>{{ url_for('users.user_page', username=post.username, _external=true) }}</uri>
+    </author>
+  </entry>
+  {%- endfor -%}
+{%- endblock -%}