Implemented sorting pages by date updated rather than date created!

Created a custom filter! It's awesome! Wheeeeee!

Author: justusthane

.eleventy.js

@@ -28,6 +28,27 @@ module.exports = function(eleventyConfig) {
     return moment(value).utc().format(arg);
   });
 
+  // This function takes an array of pages and sorts them by date updated. 
+  // If they don't have an "updated" date, it sorts them by date created instead.
+  eleventyConfig.addFilter("sortByUpdated", function(value) { 
+    
+    value.forEach(function(item) {
+      // If the page doesn't have a date updated, we'll sort it by it's date created.
+      if (typeof item.data.updated == 'undefined') {
+          item.data.sortdate = item.date;
+      } else { // Otherwise, sort by date updated
+        item.data.sortdate = item.data.updated;
+      };
+    });
+
+    // Do the sort
+    value.sort(function(a, b) {
+      return b.data.sortdate - a.data.sortdate;
+    });
+
+    return value;
+  });
+
   eleventyConfig.addNunjucksFilter("split", function(value, arg) { 
     return value.split(arg);
   });

_includes/layouts/listing.njk

@@ -11,7 +11,7 @@ layout: layouts/base.njk
 {% block content %}
 {{ content | safe }}
 <ul>
-{% for page in collections[cat] | reverse %}
+{% for page in collections[cat] | sortByUpdated %}
   <li><a href="{{ page.url }}">{{ page.data.title }}</a> <span class="publish-date">(published {{ page.date | utcDate('YYYY-MM-DD') }}{% if page.data.updated %}, updated {{ page.data.updated | utcDate('YYYY-MM-DD') }}{% endif %})</span></li>
 {% endfor %}
 </ul>