diff --git a/_config.yml b/_config.yml
index 05044ca..4ab1726 100644
--- a/_config.yml
+++ b/_config.yml
@@ -75,6 +75,10 @@ img_cdn: "https://chirpy-img.netlify.app"
# the avatar on sidebar, support local or CORS resources
avatar: "/commons/avatar.jpg"
+# The URL of the site-wide social preview image used in SEO `og:image` meta tag.
+# It can be overridden by a customized `page.image` in front matter.
+social_preview_image: # string, local or CORS resources
+
# boolean type, the global switch for TOC in posts.
toc: true
diff --git a/_includes/head.html b/_includes/head.html
index fb12d99..3885ef2 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -1,5 +1,3 @@
-
-
@@ -11,29 +9,38 @@
content="width=device-width, user-scalable=no initial-scale=1, shrink-to-fit=no, viewport-fit=cover"
>
- {% capture seo_tags %}
+ {%- capture seo_tags -%}
{% seo title=false %}
- {% endcapture %}
+ {%- endcapture -%}
+
+
{% if page.image %}
- {% assign img = page.image.path | default: page.image %}
+ {% assign src = page.image.path | default: page.image %}
- {% unless img contains '://' %}
- {% assign img_path = page.img_path | append: '/' | append: img | replace: '//', '/' %}
- {% capture target %}"{{ img | absolute_url }}"{% endcapture %}
+ {% unless src contains '://' %}
+ {%- capture img_url -%}
+ {% include img-url.html src=src img_path=page.img_path %}
+ {%- endcapture -%}
- {% if site.img_cdn contains '//' %}
-
- {% capture replacement %}"{{ site.img_cdn }}{{ img_path }}"{% endcapture %}
- {% else %}
-
- {%- capture replacement -%}
- "{{ site.img_cdn | append: '/' | append: img_path | replace: '//', '/' | absolute_url }}"
- {%- endcapture -%}
- {% endif %}
+ {%- capture old_url -%}{{ src | absolute_url }}{%- endcapture -%}
+ {%- capture new_url -%}{{ img_url }}{%- endcapture -%}
- {% assign seo_tags = seo_tags | replace: target, replacement %}
+ {% assign seo_tags = seo_tags | replace: old, new %}
{% endunless %}
+
+ {% elsif site.social_preview_image %}
+ {%- capture img_url -%}
+ {% include img-url.html src=site.social_preview_image %}
+ {%- endcapture -%}
+
+ {%- capture og_image -%}
+
+ {%- endcapture -%}
+
+ {% assign old_meta_clip = '
- {% if site.img_cdn %}
- {% if site.img_cdn contains '//' %}
- {% assign _path_prefix = site.img_cdn %}
- {% else %}
- {% assign _path_prefix = site.img_cdn | relative_url %}
- {% endif %}
- {% else %}
- {% assign _path_prefix = site.baseurl %}
- {% endif %}
-
-
- {% if page.img_path %}
- {% assign _path = page.img_path | append: '/' | replace: '//', '/' %}
- {% assign _path_prefix = _path_prefix | append: _path %}
- {% endif %}
-
{% for _img_snippet in _img_snippets %}
{% if forloop.first %}
{% assign _img_content = _img_snippet %}
@@ -113,6 +96,12 @@
{% assign _final_src = null %}
{% assign _lazyload = true %}
+ {%- capture _img_url -%}
+ {% include img-url.html src=_src img_path=page.img_path %}
+ {%- endcapture -%}
+
+ {% assign _path_prefix = _img_url | remove: _src %}
+
{% unless _src contains '//' %}
{% assign _final_src = _path_prefix | append: _src %}
{% assign _src_alt = 'src="' | append: _path_prefix %}
diff --git a/_includes/sidebar.html b/_includes/sidebar.html
index 99d6dcc..b8f92e3 100644
--- a/_includes/sidebar.html
+++ b/_includes/sidebar.html
@@ -3,18 +3,12 @@