Add "group by array" include to simplify archive pages

_includes/group-by-array.html

@@ -0,0 +1,47 @@
+<!--
+# Jekyll Group-By-Array 0.1.0
+# https://github.com/mushishi78/jekyll-group-by-array
+# © 2015 Max White <mushishi78@gmail.com>
+# MIT License
+-->
+
+<!-- Initialize -->
+{% assign __empty_array = '' | split: ',' %}
+{% assign group_names = __empty_array %}
+{% assign group_items = __empty_array %}
+
+<!-- Map -->
+{% assign __names =  include.collection | map: include.field %}
+
+<!-- Flatten -->
+{% assign __names =  __names | join: ',' | join: ',' | split: ',' %}
+
+<!-- Uniq -->
+{% assign __names =  __names | sort %}
+{% for name in __names | sort %}
+
+  <!-- If not equal to previous then it must be unique as sorted -->
+  {% unless name == previous %}
+
+    <!-- Push to group_names -->
+    {% assign group_names = group_names | push: name %}
+  {% endunless %}
+
+  {% assign previous = name %}
+{% endfor %}
+
+
+<!-- group_items -->
+{% for name in group_names %}
+
+  <!-- Collect if contains -->
+  {% assign __item = __empty_array %}
+  {% for __element in include.collection %}
+    {% if __element[include.field] contains name %}
+      {% assign __item = __item | push: __element %}
+    {% endif %}
+  {% endfor %}
+
+  <!-- Push to group_items -->
+  {% assign group_items = group_items | push: __item %}
+{% endfor %}

_pages/category-archive.html

@@ -4,15 +4,12 @@ permalink: /category-archive/
 title: "Posts by Category"
 ---
 {% include absolute-url.liquid %}
-{% capture site_categories %}{% for category in site.categories %}{{ category | first }}{% unless forloop.last %},{% endunless %}{% endfor %}{% endcapture %}
-{% assign category_list = site_categories | split:',' | sort %}
+{% include group-by-array.html collection=site.posts field='categories' %}
 
-{% for item in (0..site.categories.size) %}
-  {% unless forloop.last %}
-  {% capture category_name %}{{ category_list[item] | strip_newlines }}{% endcapture %}
-    <h3>{{ category_name }}</h3>
-    {% for post in site.categories[category_name] %}
-      {% if post.title != null %}
+{% for category in group_names %}
+  {% assign posts = group_items[forloop.index0] %}
+  <h3>{{ category }}</h3>
+  {% for post in posts %}
     <article itemscope itemtype="http://schema.org/CreativeWork">
       {% if post.link %}
         <h2 class="link-post" itemprop="headline"><a href="{{ absurl }}{{ post.url }}" title="{{ post.title }}">{{ post.title }}</a> <a href="{{ post.link }}" target="_blank" title="{{ post.title }}"><i class="fa fa-link"></i></a></h2>
@@ -21,7 +18,5 @@ title: "Posts by Category"
         <p itemprop="description">{{ post.excerpt | markdownify | strip_html | strip_newlines | escape_once }}</p>
       {% endif %}
     </article>
-      {% endif %}
   {% endfor %}
-  {% endunless %}
 {% endfor %}

_pages/recipes-archive.html

@@ -0,0 +1,22 @@
+---
+layout: archive
+title: "Recipes Archive"
+permalink: /recipes-archive/
+---
+{% include absolute-url.liquid %}
+{% include group-by-array.html collection=site.recipes field='categories' %}
+
+{% for category in group_names %}
+  {% assign posts = group_items[forloop.index0] %}
+  <h3>{{ category }}</h3>
+  {% for post in posts %}
+    <article itemscope itemtype="http://schema.org/CreativeWork">
+      {% if post.link %}
+        <h2 class="link-post" itemprop="headline"><a href="{{ absurl }}{{ post.url }}" title="{{ post.title }}">{{ post.title }}</a> <a href="{{ post.link }}" target="_blank" title="{{ post.title }}"><i class="fa fa-link"></i></a></h2>
+      {% else %}
+        <h2 itemprop="headline"><a href="{{ absurl }}{{ post.url }}" title="{{ post.title }}">{{ post.title }}</a></h2>
+        <p itemprop="description">{{ post.excerpt | markdownify | strip_html | strip_newlines | escape_once }}</p>
+      {% endif %}
+    </article>
+  {% endfor %}
+{% endfor %}

_pages/tag-archive.html

@@ -4,14 +4,12 @@ permalink: /tag-archive/
 title: "Posts by Tags"
 ---
 {% include absolute-url.liquid %}
-{% capture site_tags %}{% for tag in site.tags %}{{ tag | first }}{% unless forloop.last %},{% endunless %}{% endfor %}{% endcapture %}
-{% assign tag_list = site_tags | split:',' | sort %}
+{% include group-by-array.html collection=site.posts field='tags' %}
 
-{% for item in (0..site.tags.size) %}
-  {% unless forloop.last %}
-    {% capture tag_name %}{{ tag_list[item] | strip_newlines }}{% endcapture %}
-      <h3>{{ tag_name }}</h3>
-      {% for post in site.tags[tag_name] %}{% if post.title != null %}
+{% for tag in group_names %}
+  {% assign posts = group_items[forloop.index0] %}
+  <h3>{{ tag }}</h3>
+  {% for post in posts %}
     <article itemscope itemtype="http://schema.org/CreativeWork">
       {% if post.link %}
         <h2 class="link-post" itemprop="headline"><a href="{{ absurl }}{{ post.url }}" title="{{ post.title }}">{{ post.title }}</a> <a href="{{ post.link }}" target="_blank" title="{{ post.title }}"><i class="fa fa-link"></i></a></h2>
@@ -20,7 +18,5 @@ title: "Posts by Tags"
         <p itemprop="description">{{ post.excerpt | markdownify | strip_html | strip_newlines | escape_once }}</p>
       {% endif %}
     </article>
-        {% endif %}
   {% endfor %}
-  {% endunless %}
 {% endfor %}