Render the table of contents, and group /blog/ by year

Two of the differences the page-by-page diff against the live site turned up.

The TOC was the larger one: live has one on 171 pages and the org-ssg build had
none. `[html] toc = true` only *exposes* `page.toc` — rendering it is the
layout's job, and base.html never did. It now emits the same
`div#table-of-contents` Emacs does, from a recursive macro over the tree. The
anchors already matched, so every link lands where the live one does. Pages that
say `#+OPTIONS: toc:nil` get an empty tree and render nothing, which is why
/uses/, /now/ and /salary/ have no TOC here either — the same three as live.

/blog/ now breaks its list under year headings, as the live index does, using
`page.year` and minijinja's groupby. `group_by_year` at the top of blog.html
turns it off for one flat list.

After both, /blog/ matches the live page's content exactly, and 171 of 171 TOCs
are accounted for.

1 files changed, 18 insertions, 0 deletions

diff --git a/content/templates/blog.html b/content/templates/blog.html
index ad6720a..17f8870 100644
--- a/content/templates/blog.html
+++ b/content/templates/blog.html
@@ -1,16 +1,34 @@
 {# The blog index at /blog/, mirroring theme/templates/blog.html.
    Separate from list.html because the live page carries its own prose. #}
 {% extends "base.html" %}
+
+{#- Group the list under year headings, as the live site does. Set to false for one flat
+    list; styles.css has .post-list-year either way. `page.year` comes from #+DATE:, and
+    a post without one lands in its own group at the end rather than being dropped. #}
+{%- set group_by_year = true %}
+
 {% block main %}
 <h1>{{ page.title }}</h1>
 <p>Use <code>&#8984; F</code> / <code>Ctrl F</code> to search &middot; <a href="{{ root }}feed.xml">RSS Feed</a></p>
 <p>Want to browse by topic instead? Head over to the <a href="{{ root }}tags/index.html">tags</a> page.</p>
 <ul class="post-list">
+{%- if group_by_year %}
+{%- for year, posts in pages | groupby("year") | reverse %}
+<li class="post-list-year">{{ year if year else "undated" }}</li>
+{%- for entry in posts %}
+<li class="post-list-item">
+{%- if entry.date_iso %}<time datetime="{{ entry.date_iso }}">{{ entry.date_iso }}</time>{% endif %}
+<a href="{{ root }}{{ entry.url }}">{{ entry.title }}</a>
+</li>
+{%- endfor %}
+{%- endfor %}
+{%- else %}
 {%- for entry in pages %}
 <li class="post-list-item">
 {%- if entry.date_iso %}<time datetime="{{ entry.date_iso }}">{{ entry.date_iso }}</time>{% endif %}
 <a href="{{ root }}{{ entry.url }}">{{ entry.title }}</a>
 </li>
 {%- endfor %}
+{%- endif %}
 </ul>
 {% endblock %}