add disqus comments to article page

templates/article.jade

@@ -1,4 +1,4 @@
-
+include mixins/disqus
 extends layout
 
 block append vars
@@ -18,8 +18,9 @@ block content
   article.article
     section.content!= typogr(page.html).typogrify()
 
+    section.comments
+      +disqus
+
 block prepend footer
   div.nav
     a(href=contents.index.url) « Full blog
-
-

templates/mixins/disqus.jade

@@ -0,0 +1,18 @@
+mixin disqus
+  #disqus_thread
+    script(type="text/javascript").
+      var disqus_shortname = 'brettlangdon';
+      var disqus_identifier = '#{page.title}';
+      var disqus_title = '#{page.title}';
+      var disqus_url = "http://brett.is#{page.url}";
+      (function() {
+        var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
+        dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
+        (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
+      })();
+    noscript
+      | Please enable JavaScript to view the
+      a(href="http://disqus.com/?ref_noscript")=" comments powered by Disqus."
+    a(href="http://disqus.com").dsq-brlink
+      | comments powered by
+      span.logo-disqus=" Disqus"