Group blog posts by year

We'll see how much I like this.

site/templates/_imports/blog.html

@@ -1,14 +1,30 @@
 {# :t posts = list[typedef.AbbreviatedPost]
-   :t highlightFavourites = bool #}
-{% macro postList(posts, highlightFavourites=True) -%}
-<ul>
-    {% for post in posts %}
-        {% set showFavourite = post.isFavourite and highlightFavourites %}
-        <li>
-            <span class="font--tnum text--secondary">{{ post.publishedDate | fmtdate }}</span> {% if showFavourite %}<b class="favourite">{% endif %}<a href="/blog/{{ post.slug }}">{{ post.title }}</a>{% if showFavourite %}</b>{% endif %}
-        </li>
-    {% endfor %}
-</ul>
+   :t highlightFavourites = bool
+   :t splitYears = bool #}
+{% macro postList(posts, highlightFavourites=True, splitYears=True) -%}
+    {% if splitYears %}
+        {% for year, items in posts|groupby("publishedDate.year")|reverse %}
+            <h2 id="year-{{ year }}">{{ year }}</h2>
+            <ul>
+                {% for post in items %}
+                    {{ postListItem(post, highlightFavourites) }}
+                {% endfor %}
+            </ul>
+        {% endfor %}
+    {% else %}
+        <ul>
+            {% for post in posts %}
+                {{ postListItem(post, highlightFavourites) }}
+            {% endfor %}
+        </ul>
+    {% endif %}
+{%- endmacro %}
+
+{% macro postListItem(post, highlightFavourite) -%}
+{% set showFavourite = post.isFavourite and highlightFavourite %}
+<li>
+    <span class="font--tnum text--secondary">{{ post.publishedDate | fmtdate }}</span> {% if showFavourite %}<b class="favourite">{% endif %}<a href="/blog/{{ post.slug }}">{{ post.title }}</a>{% if showFavourite %}</b>{% endif %}
+</li>
 {%- endmacro %}
 
 {% macro feedHeaders() -%}

site/templates/_layouts/blog/postsFilteredByTag.html

@@ -10,7 +10,7 @@
 
 <p>{% if tag.description %}{{ tag.description }}{% endif %}</p>
 
-{{ blog.postList(posts, highlightFavourites=False) }}
+{{ blog.postList(posts, highlightFavourites=False, splitYears=False) }}
 {% endblock %}
 
 {% block aside %}{% endblock %}