add Disqus comments functionality, activate on whitepaper

_config.yml

@@ -10,6 +10,7 @@ email:
     contact:            contact@bigchaindb.com
 
 twitter:                BigchainDB
+disqus:                 bigchain
 
 
 # Track all the things

_src/_assets/styles/bigchain.scss

@@ -34,6 +34,7 @@
 
 // Content types
 @import 'bigchain/_content-page';
+@import 'bigchain/_comments';
 
 // specific page styles
 @import 'page-front';

_src/_assets/styles/bigchain/_comments.scss

@@ -0,0 +1,16 @@
+//
+// Comments
+// --------------
+// bigchain.io
+//
+
+.comments {
+    margin-bottom: ($spacer * 2);
+
+    .row > h1 {
+        border-bottom: 2px solid $gray-lightest;
+        padding-bottom: $spacer;
+        margin-bottom: ($spacer * 2);
+        text-align: center;
+    }
+}

_src/_includes/scripts.html

@@ -66,3 +66,33 @@ svg4everybody.js
 {% else %}
     <script async src="//www.google-analytics.com/analytics_debug.js"></script>
 {% endif%}
+
+
+<!--
+//
+// Disqus comments
+//
+-->
+{% if page.comments %}
+<script>
+    var disqus_config = function () {
+        this.page.url = '{{ site.url }}{{ page.url }}';
+        this.page.identifier = '{{ page.id }}';
+        this.page.title = '{{ page.title }}';
+    };
+
+    {% if jekyll.environment == "development" %}
+    var disqus_developer = 1;
+    {% endif %}
+
+    (function() {
+        var d = document, s = d.createElement('script');
+
+        s.src = '//{{ site.disqus }}.disqus.com/embed.js';
+
+        s.setAttribute('data-timestamp', +new Date());
+        (d.head || d.body).appendChild(s);
+    })();
+</script>
+<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript" rel="nofollow">comments powered by Disqus.</a></noscript>
+{% endif %}

_src/_layouts/page.html

@@ -24,3 +24,12 @@ layout: base
     {% endif %}
 
 </section>
+
+{% if page.comments %}
+    <footer class="comments">
+        <div class="row">
+            <h1 id="comments">Comments</h1>
+            <div id="disqus_thread"></div>
+        </div>
+    </footer>
+{% endif %}

_src/whitepaper/index.md

@@ -2,6 +2,8 @@
 layout: page
 
 title: 'Bigchain: A Scalable Blockchain Database'
+
+comments: true
 ---
 
 Trent McConaghy, Rodolphe Marques, Andreas Müller