jekyll-seo-tag/lib/template.html

<!-- Begin Jekyll SEO tag v{{ seo_tag.version }} -->

{% if page.url == "/" or page.url == "/about/" %}
  {% assign seo_homepage_or_about = true %}
{% endif %}

{% 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 page.seo and page.seo.name %}
    {% assign seo_name = page.seo.name %}
{% elsif seo_homepage_or_about and site.social and site.social.name %}
    {% assign seo_name = site.social.name %}
{% elsif seo_homepage_or_about and seo_site_title %}
    {% assign seo_name = seo_site_title %}
{% endif %}
{% if seo_name %}
  {% assign seo_name = seo_name | markdownify | strip_html | strip_newlines | escape_once %}
{% 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 %}

{% assign seo_author = page.author | default: page.authors[0] | default: site.author %}
{% if seo_author %}
  {% if seo_author.twitter %}
    {% assign seo_author_twitter = seo_author.twitter %}
  {% else %}
    {% if site.data.authors and site.data.authors[seo_author] %}
      {% assign seo_author_twitter = site.data.authors[seo_author].twitter  %}
    {% else %}
      {% assign seo_author_twitter = seo_author  %}
    {% endif %}
  {% endif %}
  {% assign seo_author_twitter = seo_author_twitter | replace:"@","" %}
{% endif %}

{% if page.seo and page.seo.type %}
    {% assign seo_type = page.seo.type %}
{% elsif seo_homepage_or_about %}
    {% assign seo_type = "WebSite" %}
{% elsif page.date %}
    {% assign seo_type = "BlogPosting" %}
{% else %}
    {% assign seo_type = "WebPage" %}
{% endif %}

{% if page.seo and page.seo.links %}
    {% assign seo_links = page.seo.links %}
{% elsif seo_homepage_or_about and site.social and site.social.links %}
    {% assign seo_links = site.social.links %}
{% endif %}

{% if seo_tag.title and seo_title %}
  <title>{{ seo_title }}</title>
{% endif %}

{% if seo_page_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 }}" />
{% endif %}

{% if page.image %}
  <meta property="og:image" content="{{ page.image | 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 %}
{% endif %}

{% if site.twitter %}

  {% if page.image %}
    <meta name="twitter:card" content="summary_large_image" />
  {% elsif  %}
    <meta name="twitter:card" content="summary" />
  {% endif %}
  
  <meta name="twitter:site" content="@{{ site.twitter.username | replace:"@","" }}" />

  {% if seo_author_twitter %}
    <meta name="twitter:creator" content="@{{ seo_author_twitter }}" />
  {% endif %}
{% endif %}

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

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

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

<script type="application/ld+json">
  {
    "@context": "http://schema.org",

{% if seo_type %}
    "@type": {{ seo_type | jsonify }},
{% endif %}

{% if seo_name %}
    "name": {{ seo_name | jsonify }},
{% endif %}

{% if seo_page_title %}
    "headline": {{ seo_page_title | jsonify }},
{% endif %}

{% if page.image %}
    "image": {{ page.image | jsonify }},
{% endif %}

{% if page.date %}
    "datePublished": {{ page.date | date_to_xmlschema | jsonify }},
{% endif %}

{% if seo_description %}
    "description": {{ seo_description | jsonify }},
{% endif %}

{% if site.logo %}
    "logo": {{ site.logo | prepend: "/" | prepend: seo_url | jsonify }},
{% endif %}

{% if seo_links %}
    "sameAs": {{ seo_links | jsonify }},
{% endif %}

    "url": {{ page.url | prepend: seo_url | replace:'/index.html','/' | jsonify }}
  }
</script>

<!-- End Jekyll SEO tag -->