Add support for atom / rss feedHEADmaster

Date format was changed to support `updated` in ISO format. Now every
post will require date and time, which might be a usability regression,
but we'll see. Also, `updated` field was introduced in metadata. If
there is no such field, them date field will be used instead.

3 files changed, 37 insertions, 5 deletions

diff --git a/templates/atom.xml b/templates/atom.xml
new file mode 100644
index 0000000..ba7fbda
--- /dev/null
+++ b/templates/atom.xml
@@ -0,0 +1,24 @@
+<feed xmlns="http://www.w3.org/2005/Atom">
+    <title>blog.ilvokhin.com</title>
+    <id>tag:blog.ilvokhin.com,2022:blog.ilvokhin.com</id>
+    <link rel="alternate" href="https://blog.ilvokhin.com"></link>
+    <link rel="self" href="https://blog.ilvokhin.com/atom.xml"></link>
+    <updated>{{ updated.isoformat() }}</updated>
+    <author>
+        <name>Dmitry Ilvokhin</name>
+        <uri>https://ilvokhin.com/</uri>
+        <email>d@ilvokhin.com</email>
+    </author>
+{% if posts %}
+    {% for post in posts %}
+    <entry>
+        <title>{{ post.metadata.title }}</title>
+        <id>tag:blog.ilvokhin.com,2022:blog.ilvokhin.com/{{ post.name }}</id>
+        <link rel="alternate" href="https://blog.ilvokhin.com/{{ post.name }}"></link>
+        <published>{{ post.metadata.date.isoformat() }}</published>
+        <updated>{{ post.metadata.updated.isoformat() }}</updated>
+        <content type="html">{{ post.content }}</content>
+    </entry>
+    {% endfor %}
+{% endif %}
+</feed>
diff --git a/templates/feed.html b/templates/feed.html
index deb89c5..e17d3d0 100644
--- a/templates/feed.html
+++ b/templates/feed.html
@@ -28,8 +28,8 @@
         <li>
             <span>
             <i>
-            <time datetime="{{ post.metadata.date }}" pubdate>
-            {{ post.metadata.date }}
+            <time datetime="{{ post.metadata.date.strftime('%Y-%m-%d') }}" pubdate>
+            {{ post.metadata.date.strftime('%Y-%m-%d') }}
             </time>
             </i>
             </span>
@@ -41,6 +41,9 @@
 
 </content>
 </main>
+<footer>
+    <small><p><a class="rss" href="/atom.xml">Atom / RSS</a></p><small>
+</footer>
 </body>
 
 </html>
diff --git a/templates/post.html b/templates/post.html
index 20c3ac2..f61a2bd 100644
--- a/templates/post.html
+++ b/templates/post.html
@@ -22,9 +22,14 @@
 <main>
 <h1>{{ title }}</h1>
 <p>
-    <i><time datetime="{{ date }}" pubdate>
-    {{ date }}
-    </time></i>
+    <i>
+    <time datetime="{{ date.strftime('%Y-%m-%d') }}" pubdate>
+        {{ date.strftime('%Y-%m-%d') }}
+    </time>
+    {% if date != updated %}
+    (updated <time datetime="{{ updated.strftime('%Y-%m-%d') }}">{{ updated.strftime('%Y-%m-%d') }}</time>)
+    {% endif %}
+    </i>
 {% if status == "draft" %}
 • {{ status }}
 {% endif %}