From 38891b9062100a1f6f5d9e0474d4ca702c4a9db0 Mon Sep 17 00:00:00 2001
From: nikaera <GimNikaErast@gmail.com>
Date: Fri, 22 Oct 2021 23:22:45 +0900
Subject: [PATCH] Add `showCanonicalLink` to markdown metadata (#428)

If an article has a `canonicalUrl` set, Originally published at `<hostname>` will be displayed at the top of the article by setting `showCanonicalLink` to true.

Usage =>
  In front-matter:
    canonicalUrl: "<URL>"
    showCanonicalLink: true
---
 layouts/_default/single.html         | 1 +
 layouts/partials/post_canonical.html | 9 +++++++++
 2 files changed, 10 insertions(+)
 create mode 100644 layouts/partials/post_canonical.html

diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index 355697e2..1d983fd0 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -17,6 +17,7 @@
       {{- partial "post_meta.html" . -}}
       {{- partial "translation_list.html" . -}}
       {{- partial "edit_post.html" . -}}
+      {{- partial "post_canonical.html" . -}}
     </div>
     {{- end }}
   </header>
diff --git a/layouts/partials/post_canonical.html b/layouts/partials/post_canonical.html
new file mode 100644
index 00000000..9befad12
--- /dev/null
+++ b/layouts/partials/post_canonical.html
@@ -0,0 +1,9 @@
+{{ if and (.Params.canonicalURL) (.Params.ShowCanonicalLink ) -}}
+{{ $url := urls.Parse .Params.canonicalURL }}
+
+{{- if or .Params.author $.Site.Params.author (.Param "ShowReadingTime") (not .Date.IsZero) .IsTranslated (or .Params.editPost.URL .Site.Params.editPost.URL) }}&nbsp;|&nbsp;{{- end -}}
+<span>
+    {{- (.Site.Params.CanonicalLinkText | default .Params.CanonicalLinkText) | default "Originally published at" -}}
+    &nbsp;<a href="{{ trim .Params.canonicalURL " " }}" title="{{ trim .Params.canonicalURL " " }}" target="_blank" rel="noopener noreferrer">{{ $url.Host }}</a>
+</span>
+{{- end }}