Fail the build on templating errors and undefined variables

Author: AndrewKvalheim

_config.yml

@@ -4,6 +4,10 @@ future:         false # Workaround for SeaGL/seagl.github.io#170
 timezone:       America/Los_Angeles
 markdown:       kramdown
 highlighter:    rouge
+liquid:
+  error_mode: strict
+  strict_filters: true
+  strict_variables: true
 
 # Allowed plugins: https://pages.github.com/versions/
 plugins: &plugins

_includes/header.html

@@ -1,3 +1,6 @@
+{% comment %} Workaround for https://github.com/Shopify/liquid/issues/1034 {% endcomment %}
+{% assign nav = nil %}{% if page contains "nav" %}{% assign nav = page.nav %}{% endif %}
+
 {% assign sponsor_year = site.sponsor-years | last %}
 
 <nav class="navbar navbar-default" role="navigation" id="main-nav">
@@ -15,13 +18,13 @@
 
   <div id="main-nav-container" class="collapse navbar-collapse top-nav-collapse">
     <ul class="nav pull-left navbar-nav main-nav-links inline-list">
-      <li {% if page.nav == "home" %} class="active" | {% endif %} ><a href="/">Home</a></li>
-      <li {% if page.nav == "get_involved" %} class="active" | {% endif %} ><a href="/get_involved.html">Get Involved</a></li>
+      <li {% if nav == "home" %} class="active" | {% endif %} ><a href="/">Home</a></li>
+      <li {% if nav == "get_involved" %} class="active" | {% endif %} ><a href="/get_involved.html">Get Involved</a></li>
     </ul>
 
     <ul class="nav pull-right navbar-nav main-nav-links inline-list">
-      <li {% if page.nav == "sponsors" %} class="active" | {% endif %} ><a href="{{ sponsor_year.url }}">Sponsors</a></li>
-      <li {% if page.nav == "archive" %} class="active" | {% endif %} ><a href="/archive">Archive</a></li>
+      <li {% if nav == "sponsors" %} class="active" | {% endif %} ><a href="{{ sponsor_year.url }}">Sponsors</a></li>
+      <li {% if nav == "archive" %} class="active" | {% endif %} ><a href="/archive">Archive</a></li>
     </ul>
   </div><!-- /.navbar-collapse -->
 </nav>

_layouts/archive/conference.html

@@ -34,14 +34,14 @@ <h2>{{ day.name }}</h2>
             <div>
               <a href="{{ session.url }}">{{ session.title }}</a>
 
-              {% if session.keynote %}
+              {% if session contains 'keynote' and session.keynote %}
               <span class="label label-default">Keynote</span>
               {% endif %}
             </div>
 
             {% for presenter in session.presenters %}
             <div>
-              {{ presenter.name }}{% if presenter.affiliation %}<span class="text-muted">, {{ presenter.affiliation }}</span>{% endif %}
+              {{ presenter.name }}{% if presenter contains 'affiliation' %}<span class="text-muted">, {{ presenter.affiliation }}</span>{% endif %}
             </div>
             {% endfor %}
           </li>

_layouts/archive/session.html

@@ -8,7 +8,7 @@
 <div class="row">
   <div class="col-xs-12 col-lg-10 col-lg-push-1">
     {% if session.resources %}
-    {% if session.resources.internet_archive_identifier %}
+    {% if session.resources contains 'internet_archive_identifier' %}
     <figure>
       <div class="embed-responsive embed-responsive-16by9">
         <iframe class="embed-responsive-item" src="https://archive.org/embed/{{ session.resources.internet_archive_identifier }}" allowfullscreen mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
@@ -19,7 +19,7 @@
         If you value their service, please consider thanking them with a small donation.
       </figcaption>
     </figure>
-    {% elsif session.resources.youtube_id %}
+    {% elsif session.resources contains 'youtube_id' %}
     <figure>
       <div class="embed-responsive embed-responsive-16by9">
         <div class="embed-responsive-item embed-placeholder">
@@ -41,7 +41,7 @@
         <h2>{{ session.title }}</h2>
 
         <p>
-          {% if session.keynote %}
+          {% if session contains 'keynote' and session.keynote %}
           <span class="label label-default">Keynote</span>
           {% endif %}
         </p>
@@ -50,7 +50,7 @@ <h2>{{ session.title }}</h2>
       </div>
 
       <div class="col-xs-12 col-md-5">
-        {% if session.presenters %}
+        {% if session contains 'presenters' %}
         <h3>Presenters</h3>
 
         {% for presenter in session.presenters %}
@@ -59,32 +59,32 @@ <h3>Presenters</h3>
             <img class="img-circle" width="64" height="64" alt="{{ presenter.name }}" src="https://s.gravatar.com/avatar/{{ presenter.gravatar_id }}?d=mp&s=128">
           </div>
           <div class="media-body media-middle">
-            <h4 class="media-heading">{{ presenter.name }}{% if presenter.pronouns %}<span class="text-muted"> ({{ presenter.pronouns }})</span>{% endif %}{% if presenter.affiliation %}<span class="text-muted">, {{ presenter.affiliation }}</span>{% endif %}</h4>
+            <h4 class="media-heading">{{ presenter.name }}{% if presenter contains 'pronouns' %}<span class="text-muted"> ({{ presenter.pronouns }})</span>{% endif %}{% if presenter contains 'affiliation' %}<span class="text-muted">, {{ presenter.affiliation }}</span>{% endif %}</h4>
             {{ presenter.biography | markdownify }}
           </div>
         </div>
         {% endfor %}
         {% endif %}
 
-        {% if session.resources %}
+        {% if session contains resources %}
         <h3>Resources</h3>
 
         <ul>
-          {% if session.resources.resources_url %}
+          {% if session.resources contains 'resources_url' %}
           <li><a href="{{ session.resources.resources_url }}">Resources</a></li>
           {% endif %}
 
-          {% if session.resources.slides_url %}
+          {% if session.resources contains 'slides_url' %}
           <li><a href="{{ session.resources.slides_url }}">Slides</a></li>
           {% endif %}
 
-          {% if session.resources.internet_archive_identifier %}
+          {% if session.resources contains 'internet_archive_identifier' %}
           <li><a href="https://archive.org/details/{{ session.resources.internet_archive_identifier }}">Video Recording</a></li>
-          {% elsif session.resources.youtube_id %}
+          {% elsif session.resources contains 'youtube_id' %}
           <li><a href="https://youtu.be/{{ session.resources.youtube_id }}">Video Recording</a></li>
           {% endif %}
 
-          {% if session.resources.audio_url %}
+          {% if session.resources contains 'audio_url' %}
           <li><a href="{{ session.resources.audio_url }}">Audio Recording</a></li>
           {% endif %}
         </ul>

_layouts/base.html

@@ -5,7 +5,7 @@
     <meta charset='utf-8' />
     <meta http-equiv="X-UA-Compatible" content="chrome=1" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    {% if page.description %}<meta name="description" content="{{ page.description }}" />{% endif %}
+    {% if page contains "description" %}<meta name="description" content="{{ page.description }}" />{% endif %}
 
     <link rel="alternate" type="application/rss+xml" title="{{ site.name }} RSS" href="{{ site.origin }}/feed.xml" />
     <link rel="image_src" href="{{ site.origin }}/img/logo.png" />
@@ -29,13 +29,13 @@
     <link rel="stylesheet" type="text/css" media="screen" href="/css/app/ribbon.css">
     <link rel="stylesheet" type="text/css" media="screen" href="/css/app/style_guide.css">
 
-    <title>{% if page.title %}{{ page.title }} | {% endif %}Seattle GNU/Linux Conference</title>
+    <title>{{ page.title }}{% unless page.title contains site.name %} | {{ site.name }}{% endunless %}</title>
 
     <script src="/js/jquery.min.js"></script>
     <script src="/js/vendor/bootstrap-3.3.7.min.js"></script>
   </head>
 
-  <body id="{{ page.body_id }}">
+  <body id="{% if page contains "body_id" %}{{ page.body_id }}{% endif %}">
     {{ content }}
   </body>
 </html>

_layouts/post.html

@@ -13,13 +13,13 @@
 
     <div class="row">
       <div class="col-md-6">
-        {% if page.previous.url %}
+        {% if page.previous %}
           <a class="prev" href="{{page.previous.url}}">&laquo; {{page.previous.title}}</a>
         {% endif %}
       </div>
 
       <div class="col-md-6 text-right">
-        {% if page.next.url %}
+        {% if page.next %}
           <a class="next" href="{{page.next.url}}">{{page.next.title}} &raquo;</a>
         {% endif %}
       </div>

_layouts/sponsors.html

@@ -34,10 +34,10 @@ <h2>{{ level[1] }}</h2>
     {% for sponsor in sponsors %}
       {% for sponsorship in sponsor.sponsorships %}
         {% if sponsorship[0] == year and sponsorship[1] == level[0] %}
-          <a class="logo-wall-item {% if sponsor.logo.horizontal %}horizontal{% endif %}" href="{{ sponsor.url }}">
-            {% if sponsor.logo.horizontal %}
+          <a class="logo-wall-item {% if sponsor.logo contains 'horizontal' %}horizontal{% endif %}" href="{{ sponsor.url }}">
+            {% if sponsor.logo contains 'horizontal' %}
               <img src="{{ sponsor.logo.horizontal }}" alt="{{ sponsor.name }}">
-            {% elsif sponsor.logo.square %}
+            {% elsif sponsor.logo contains 'square' %}
               <img src="{{ sponsor.logo.square }}" alt="{{ sponsor.name }}">
             {% else %}
               {{ sponsor.name }}

archive.html

@@ -19,7 +19,7 @@ <h2>
       <a href="{{ conference.url }}">SeaGL {{ year }}</a>
     </h2>
 
-    {% if conference.subtitle %}
+    {% if conference contains 'subtitle' %}
     <div style="font-style: italic;">{{ conference.subtitle }}</div>
     {% endif %}
   </div>

index.md

@@ -2,6 +2,7 @@
 layout: page
 nav: home
 body_id: home
+title: Seattle GNU/Linux Conference
 description: SeaGL is a grassroots technical conference dedicated to spreading awareness and knowledge about the GNU/Linux community and free/libre/open-source software/hardware.
 ---
 

meet.md

@@ -2,6 +2,7 @@
 layout: page
 redirect_from:
   - /chat
+title: Community Chat
 ---
 
 <div class="row"><div class="col col-md-10 col-md-offset-1" markdown="1">