From a4fd96a4de97dd204137bf3ee0799dd71be6552e Mon Sep 17 00:00:00 2001
From: Marcus Noble <m.noble@elsevier.com>
Date: Tue, 26 Jul 2016 13:41:47 +0100
Subject: [PATCH] Open graph support

---
 app.js                       | 1 +
 templates/partials/head.html | 7 +++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/app.js b/app.js
index 0ab9da3..0a7e61b 100644
--- a/app.js
+++ b/app.js
@@ -29,6 +29,7 @@ var md = markdown('commonmark', {html: true});
 md.parser.use(emoji);
 
 Handlebars.registerHelper('markdown', function(text) {
+  if(!text) return;
   return md.parser.render(text);
 });
 Handlebars.registerHelper('moment', function(date, format) {
diff --git a/templates/partials/head.html b/templates/partials/head.html
index 7cedd51..0e9fdf2 100644
--- a/templates/partials/head.html
+++ b/templates/partials/head.html
@@ -4,12 +4,15 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
 
   <title>{{ site.title }}</title>
-  <meta name="description" content="{{ title }}">
+
+  <meta property="og:url" content="{{ site.url}}/{{ path }}"/>
+  <meta property="og:title" content="{{ title }}"/>
+  <meta property="og:description" content="{{ markdown summary }}"/>
+  <meta property="og:site_name" content="{{ site.title }}"/>
 
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/milligram/1.1.0/milligram.min.css">
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.4.0/styles/zenburn.min.css">
   <link rel="stylesheet" href="/css/main.css?{{moment date 'YYYYMMDDHHMM'}}">
-  <link rel="canonical" href="{{ site.url }}">
   <link rel="alternate" type="application/rss+xml" title="{{ site.title }}" href="{{ site.url }}/feed.xml">
   <link href="data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQEAYAAABPYyMiAAAABmJLR0T///////8JWPfcAAAACXBIWXMAAABIAAAASABGyWs+AAAAF0lEQVRIx2NgGAWjYBSMglEwCkbBSAcACBAAAeaR9cIAAAAASUVORK5CYII=" rel="icon" type="image/x-icon" />
 </head>