Override default jekyll-seo-tag template

_includes/seo.html

@@ -0,0 +1,219 @@
+<!-- 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 | smartify | strip_html | strip_newlines | escape_once %}
+{% endif %}
+
+{% if seo_title %}
+  {% assign seo_title = seo_title | smartify | strip_html | strip_newlines | escape_once | escape_once %}
+{% endif %}
+
+{% if seo_site_title %}
+  {% assign seo_site_title = seo_site_title | smartify | strip_html | strip_newlines | escape_once %}
+{% endif %}
+
+{% if seo_page_title %}
+  {% assign seo_page_title = seo_page_title | smartify | 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 site.logo %}
+  {% assign seo_site_logo = site.logo %}
+  {% unless seo_site_logo contains "://" %}
+    {% assign seo_site_logo = seo_site_logo | prepend: seo_url %}
+  {% endunless %}
+  {% assign seo_site_logo = seo_site_logo | escape %}
+{% endif %}
+
+{% if page.image %}
+  {% assign seo_page_image = page.image.path | default: page.image.facebook | default: page.image %}
+  {% unless seo_page_image contains "://" %}
+    {% assign seo_page_image = seo_page_image | prepend: seo_url %}
+  {% endunless %}
+  {% assign seo_page_image = seo_page_image | escape %}
+{% 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 seo_page_image %}
+<meta property="og:image" content="{{ seo_page_image }}" />
+  {% if page.image.height %}
+    <meta property="og:image:height" content="{{ page.image.height }}" />
+  {% endif %}
+  {% if page.image.width %}
+    <meta property="og:image:width" content="{{ page.image.width }}" />
+  {% endif %}
+{% endif %}
+
+{% if page.image.twitter %}
+  <meta name="twitter:image" content="{{ page.image.twitter | 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 }}" />
+{% endif %}
+
+{% if paginator.previous_page %}
+  <link rel="prev" href="{{ paginator.previous_page_path | prepend: seo_url }}">
+{% endif %}
+{% if paginator.next_page %}
+  <link rel="next" href="{{ paginator.next_page_path | prepend: seo_url }}">
+{% endif %}
+
+{% if site.twitter %}
+  <meta name="twitter:card" content="summary" />
+
+  <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.admins %}
+    <meta property="fb:admins" content="{{ site.facebook.admins }}" />
+  {% endif %}
+
+  {% 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 seo_page_image %}
+    "image": {{ seo_page_image | jsonify }},
+{% endif %}
+
+{% if page.date %}
+    "datePublished": {{ page.date | date_to_xmlschema | jsonify }},
+{% endif %}
+
+{% if seo_description %}
+    "description": {{ seo_description | jsonify }},
+{% endif %}
+
+{% if seo_site_logo %}
+    "logo": {{ seo_site_logo | 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 -->

_plugins/seo-tag.rb

@@ -0,0 +1,15 @@
+module Jekyll
+  class SeoTag < Liquid::Tag
+    alias_method :old_template_path, :template_path
+
+    def template_path
+      @template_path ||= begin
+        override = File.expand_path '../_includes/seo.html', File.dirname(__FILE__)
+        override unless !File.exists? override
+      end
+      @template_path ||= old_template_path
+    end
+  end
+end
+
+Liquid::Template.register_tag('seo', Jekyll::SeoTag)