jekyll-seo-tag/lib/template.html

<!-- Begin Jekyll SEO tag -->

{% if site.url %}
  {% assign seo_url = site.url | append: site.baseurl %}
{% endif %}
{% assign seo_url = seo_url | default: site.github.url %}

{% assign seo_site_title = site.title | default: site.name %}

{% if page.title %}
  {% assign seo_title = page.title %}
  {% assign seo_page_title = page.title %}
  {% if seo_site_title %}
    {% assign seo_title = seo_title | append:" - " | append: seo_site_title %}
  {% endif %}
{% elsif seo_site_title %}
  {% assign seo_title = seo_site_title %}
  {% assign seo_page_title = seo_site_title %}
  {% if site.description %}
    {% assign seo_title = seo_title | append:" - " | append: site.description %}
  {% endif %}
{% endif %}
{% if seo_title %}
  {% assign seo_title = seo_title | markdownify | strip_html | strip_newlines | escape_once %}
{% endif %}
{% if seo_site_title %}
  {% assign seo_site_title = seo_site_title | markdownify | strip_html | strip_newlines | escape_once %}
{% endif %}
{% if seo_page_title %}
  {% assign seo_page_title = seo_page_title | markdownify | strip_html | strip_newlines | escape_once %}
{% endif %}

{% assign seo_description = page.description | default: page.excerpt | default: site.description %}
{% if seo_description %}
  {% assign seo_description = seo_description | markdownify | strip_html | strip_newlines | escape_once %}
{% endif %}

{% if page.author %}
  {% assign seo_author_name = page.author.name | default: page.author %}
  {% assign seo_author_twitter = page.author.twitter | default: page.author %}
{% endif %}
{% if seo_author_twitter %}
  {% assign seo_author_twitter = seo_author_twitter | replace:"@","" | prepend:"@" %}
{% endif %}

{% if seo_title %}
  <title>{{ seo_title }}</title>
{% endif %}

{% if seo_title %}
  <meta property="og:title" content="{{ seo_page_title }}" />
{% endif %}

{% if seo_description %}
  <meta name="description" content="{{ seo_description }}" />
  <meta property='og:description' content="{{ seo_description }}" />
{% endif %}

{% if seo_url %}
  <link rel="canonical" href="{{ page.url | prepend: seo_url | replace:'/index.html','/' }}" />
  <meta property='og:url' content='{{ page.url | prepend: seo_url | replace:'/index.html','/' }}' />
{% endif %}

{% if seo_site_title %}
  <meta property="og:site_name" content="{{ seo_site_title }}" />
  <script type="application/ld+json">
    {
      "@context" : "http://schema.org",
      "@type" : "WebSite",
      "name" : {{ seo_site_title | jsonify }},
      "url" : {{ seo_url | jsonify }}
    }
  </script>
{% endif %}

{% if page.image %}
  <meta property="og:image" content="{{ page.image | prepend: "/" | prepend: seo_url | escape }}" />
{% endif %}

{% if page.date %}
  <meta property="og:type" content="article" />
  <meta property="article:published_time" content="{{ page.date | date_to_xmlschema }}" />

  {% if page.next.url %}
    <link rel="next" href="{{ page.next.url | prepend: seo_url | replace:'/index.html','/' }}" title="{{ page.next.title | escape }}" />
  {% endif %}
  {% if page.previous.url %}
    <link rel="prev" href="{{ page.previous.url | prepend: seo_url | replace:'/index.html','/' }}" title="{{ page.previous.title | escape }}" />
  {% endif %}

  <script type="application/ld+json">
    {
      "@context": "http://schema.org",
      "@type": "NewsArticle",
      "headline": {{ page.title | jsonify }},
      "image": {{ page.image | jsonify }},
      "datePublished": {{ page.date | date_to_xmlschema | jsonify }},
      "description": {{ seo_description | jsonify }}
    }
  </script>
{% endif %}

{% if site.twitter %}
  <meta name="twitter:card" content="summary" />
  <meta name="twitter:site" content="@{{ site.twitter.username | replace:"@","" }}" />
  <meta name="twitter:title" content="{{ seo_title }}" />
  <meta name="twitter:description" content="{{ seo_description }}" />
  {% if page.image %}
    <meta name="twitter:image" content="{{ page.image | escape }}" />
  {% endif %}
  {% if seo_author_twitter %}
    <meta name="twitter:creator" content="{{ seo_author_twitter }}" />
  {% endif %}
{% endif %}

{% if site.facebook %}
  <meta property="article:publisher" content="{{ site.facebook.publisher }}" />
  <meta property="fb:app_id" content="{{ site.facebook.app_id }}" />

{% if site.google_site_verification %}
  <meta name="google-site-verification" content="{{ site.google_site_verification }}" />
{% endif %}

{% if site.logo %}
  <script type="application/ld+json">
    {
      "@context": "http://schema.org",
      "@type": "Organization",
      "url": {{ seo_url | jsonify }},
      "logo": {{ site.logo | prepend: "/" | prepend: seo_url | jsonify }}
    }
  </script>
{% endif %}

{% if site.social %}
  <script type="application/ld+json">
    {
      "@context" : "http://schema.org",
      "@type" : "{% if site.social.type %}{{ site.social.type }}{% else %}person{% endif %}",
      "name" : "{% if site.social.name %}{{ site.social.name }}{% else %}{{ seo_site_title }}{% endif %}",
      "url" : {{ seo_url | jsonify }},
      "sameAs" : {{ site.social.links | jsonify }}
    }
  </script>
{% endif %}

<!-- End Jekyll SEO tag -->