Add twitter/facebook share hints

Author: vgvassilev

_config.yml

@@ -6,7 +6,7 @@
 # 'jekyll serve'. If you change this file, please restart the server process.
 
 # Site settings
-title: The Allan Lab
+title: Compiler Research
 email: [email protected]
 description: > # this means to ignore newlines until "baseurl:"
   Write an awesome description for your new site here. You can edit this

_includes/head.html

@@ -3,10 +3,8 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>{% if page.title %}{{ page.title | escape }}{% else %}{{ site.title | escape }}{% endif %}</title>
-  <meta name="description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}">
-  {% if page.banner_image %}
-  <meta name="og:image" content="{{ site.url }}{{ site.baseurl }}/{{page.banner_image}}">
-  {% endif %}
+  {% include og.html %}
+
   <link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl | prepend: site.url}}">
   <link rel="stylesheet" href="{{ "/css/syntax.css" | prepend: site.baseurl | prepend: site.url}}">
   <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">

_includes/og.html

@@ -0,0 +1,51 @@
+<meta name="author" content="{% if page.author %} {{ page.author }} {% else %} Compiler Research Team {% endif %}" />
+<meta property="og:url" content="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}" />
+<meta property="og:title" content="{% if page.title %}{{ page.title | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.title }}{% endif %}" />
+<meta property="og:description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}" />
+<meta property="og:locale" content="en_US" />
+<meta name="twitter:site" content="" />
+<meta name="twitter:description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}" />
+<meta name="twitter:title" content="{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}" />
+
+{% assign type = "website" %}
+{% if page.layout == "post" %}
+  {% assign type = "article" %}
+{% endif %}
+
+<meta property="og:type" content="{{ type }}" />
+{% if type == "article" %}
+  <!-- Article specific OG data -->
+  <meta property="article:published_time" content="{{ page.date }}" />
+  {% if page.modified %}
+    <meta property="article:modified_time" content="{{ page.modified }}" />
+  {% endif %}
+  <meta property="article:author" content="{{ page.author }}" />
+  <meta property="article:publisher" content="Compiler Research Team" />
+  <meta property="article:section" content="{{ page.vertical }}" />
+  {% for tag in page.categories %}
+    <meta property="article:tag" content="{{ tag }}" />
+  {% endfor %}
+  <meta name="keywords" content="{{ page.categories | join: ', ' }}" />
+  <meta name="twitter:card" content="summary_large_image" />
+  <meta name="twitter:creator" content="" />
+
+  {% if page.ogimagenull %}
+    <!-- no og image -->
+  {% elsif page.banner_image %}
+    <meta property="og:image" content="{{ page.banner_image }}" />
+    <meta name="twitter:image" content="{{ page.banner_image }}" />
+    <meta property="og:image:width" content="600" />
+    <meta property="og:image:height" content="315" />
+  {% elsif page.image %}
+    <meta property="og:image" content="{{ page.image }}" />
+    <meta name="twitter:image" content="{{ page.image }}" />
+  {% else %}
+  {% endif %}
+
+{% else %}
+  <!-- OG data for non-post pages -->
+  <meta property="og:type" content="website" />
+  <meta property="og:image" content="" />
+  <meta name="twitter:card" content="summary_large_image" />
+  <meta name="twitter:image" content="" />
+{% endif %}