Add tag index rendering

omicron/ssg/templates/plain/index.html

@@ -1,11 +1,16 @@
 {% extends "base.html" %}
+{% set prefix = (section + "/") if section else (("tags/" + tag + "/") if tag else "") %}
+{% set heading = section or tag or "" %}
 
-{% block title %}{% if section %}{{ section }} — {% endif %}{{ site.name }}{% if page_num > 1 %} — Page {{ page_num }}{% endif %}{% endblock %}
+{% block title %}{% if heading %}{{ heading }} — {% endif %}{{ site.name }}{% if page_num > 1 %} — Page {{ page_num }}{% endif %}{% endblock %}
 
-{% block head %}<link rel="canonical" href="{{ site.origin }}{{ site.base_dir }}{% if section %}{{ section }}/{% endif %}{% if page_num == 1 %}{% else %}page-{{ page_num }}.html{% endif %}">{% endblock %}
+{% block head %}
+<link rel="canonical" href="{{ site.origin }}{{ site.base_dir }}{{ prefix }}{% if page_num > 1 %}page-{{ page_num }}.html{% endif %}">
+{% if page_num > 1 %}<meta name="robots" content="noindex, follow">{% endif %}
+{% endblock %}
 
 {% block main %}
-{% if section %}<h1>{{ section }}</h1>{% endif %}
+{% if heading %}<h1>{{ heading }}</h1>{% endif %}
 {% for item in items %}
 <article>
     <header>
@@ -18,15 +23,15 @@
 {% if total_pages > 1 %}
 <nav>
     {% if page_num > 1 %}
-    <a href="{{ site.base_dir }}{% if section %}{{ section }}/{% endif %}page-{{ page_num - 1 }}.html">← Newer</a>
+    <a href="{{ site.base_dir }}{{ prefix }}page-{{ page_num - 1 }}.html">← Newer</a>
     {% endif %}
     {% for p in range(1, total_pages + 1) %}
     {% if p == page_num %}<strong>{{ p }}</strong>
-    {% else %}<a href="{{ site.base_dir }}{% if section %}{{ section }}/{% endif %}page-{{ p }}.html">{{ p }}</a>
+    {% else %}<a href="{{ site.base_dir }}{{ prefix }}page-{{ p }}.html">{{ p }}</a>
     {% endif %}
     {% endfor %}
     {% if page_num < total_pages %}
-    <a href="{{ site.base_dir }}{% if section %}{{ section }}/{% endif %}page-{{ page_num + 1 }}.html">Older →</a>
+    <a href="{{ site.base_dir }}{{ prefix }}page-{{ page_num + 1 }}.html">Older →</a>
     {% endif %}
 </nav>
 {% endif %}