feat: Add canonical setting

_config.yml

@@ -13,6 +13,11 @@ shake_file: true
 # Remember to set up your site-subtitle in Hexo `_config.yml`.
 index_subtitle: false
 
+# Set a canonical link tag for your Hexo site.
+# See: https://support.google.com/webmasters/answer/139066
+# Remember to set up your URL in Hexo `_config.yml` (e.g. url: http://yoursite.com)
+canonical: true
+
 # Webmaster tools verification setting
 # ---------------------------------------------------------------
 # Google Webmaster tools verification setting

layout/_partials/head/head.pug

@@ -65,6 +65,9 @@ if theme.favicon.msapplication
   meta(name="msapplication-TileImage" content=`${url_for(theme.favicon.msapplication)}`)
   meta(name="msapplication-TileColor" content="#000000")
 
+if theme.canonical
+  link(ref="canonical" href=full_url_for(page.path))
+
 if _.get(theme, 'feed.rss')
   link(rel="alternate" href=url_for(theme.feed.rss) type="application/atom+xml")