Synthesize issue ID from posts array

_includes/news-post-index.html

@@ -0,0 +1,23 @@
+{% comment %}
+  By default, we'll assume we haven't found the index.
+{% endcomment %}
+{% assign page_index = 'Unknown' %}
+
+{%- for possible_post in site.posts -%}
+  {%- if possible_post.title == post.title -%}
+    {%- assign page_index = forloop.rindex -%}
+    {%- break -%}
+  {%- endif -%}
+{%- endfor -%}
+
+
+{% comment %}
+  If we found an index, zero pad it, if necessary.
+
+  Thank you to https://stackoverflow.com/a/37453646 for this solution!
+{% endcomment %}
+{%- if page_index != 'Unknown' -%}
+  {%- assign page_index = page_index | prepend: '00' | slice: -2, 2 -%}
+{%- endif -%}
+
+Issue {{ page_index }} - {{ post.date | date: "%B %-d, %Y" }}

news.md

@@ -18,10 +18,14 @@ layout: news-post
 
 The following is an example of a news post's content:
 
-## Title
-Content
+  Introduction
 
-— Name
+  ### Subheading
+  Content
+  ### Subheading
+  Content
+
+  — Author Name
 -->
 
 {% comment %}
@@ -30,9 +34,10 @@ Content
 {% for post in site.posts limit: 3 %}
   <h1>
     <a href="{{ post.url }}">
-      {{ post.title }} - {{ post.date | date: "%B %-d, %Y" }}
+      {{ post.title }}
     </a>
   </h1>
+  <h3>{% include news-post-index.html post=post %}</h3>
 
   {{ post.content }}
 {% endfor %}
@@ -45,9 +50,10 @@ Content
 {% for post in site.posts offset: 3 %}
   <h2>
     <a href="{{ post.url }}">
-      {{ post.title }} - {{ post.date | date: "%B %-d, %Y" }}
+      {{ post.title }}
     </a>
   </h2>
+  <h3>{% include news-post-index.html post=post %}</h3>
 
   {{ post.content | strip_html | truncatewords: 50 }}
 {% endfor %}