Sort projects by date.

_projects/a-project.md

@@ -14,6 +14,7 @@ people:
   - wolverine
 
 layout: project
+last-updated: 2015-05-05
 ---
 
 Proin massa augue, eleifend non ultricies eget, feugiat ut nisl. Fusce at

_projects/logo-project.md

@@ -13,6 +13,7 @@ people:
 
 layout: project
 image: "https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Xmencomic-logo.svg/2000px-Xmencomic-logo.svg.png"
+last-updated: 2017-04-11
 ---
 
 Some preliminary text.

_projects/longer-project.md

@@ -15,4 +15,5 @@ people:
 
 layout: project
 no-link: true
+last-updated: 2016-11-11
 ---

index.html

@@ -46,7 +46,12 @@ role-tables:
 <section>
     <h2>Research</h2>
     <div class="card-columns">
-        {% for p in site.projects %}
+        {% comment %}
+        Sort the projects by date, putting those without dates last
+        {% endcomment %}
+        {% assign projects_by_date = site.projects | sort: 'last-updated', 'first' %}
+        {% assign projects_by_date = projects_by_date | reverse %}
+        {% for p in projects_by_date %}
             {% if p.status != "inactive" %}
                 {% include project-card.html project=p %}
             {% endif %}

research.html

@@ -4,7 +4,12 @@ title: Research Projects
 ---
 
 <div class="card-columns">
-    {% for p in site.projects %}
+    {% comment %}
+    Sort the projects by date, putting those without dates last
+    {% endcomment %}
+    {% assign projects_by_date = site.projects | sort: 'last-updated', 'first' %}
+    {% assign projects_by_date = projects_by_date | reverse %}
+    {% for p in projects_by_date %}
         {% include project-card.html project=p %}
     {% endfor %}
 </div>