From 3e98ac15b68f77a9dd5e93f43bf3eb8851849d9f Mon Sep 17 00:00:00 2001
From: Bruno Carlin <dev@mail.bcarlin.net>
Date: Tue, 17 Jun 2025 01:35:34 +0200
Subject: [PATCH] feat: mark external links with an icon and rel=external

---
 themes/bcarlin/assets/static/css/bcarlin.css    | 10 +++++++++-
 themes/bcarlin/layouts/_markup/render-link.html |  8 ++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 themes/bcarlin/layouts/_markup/render-link.html

diff --git a/themes/bcarlin/assets/static/css/bcarlin.css b/themes/bcarlin/assets/static/css/bcarlin.css
index 1f1637c..15c66a1 100644
--- a/themes/bcarlin/assets/static/css/bcarlin.css
+++ b/themes/bcarlin/assets/static/css/bcarlin.css
@@ -327,10 +327,18 @@ pre {
   margin-bottom: calc(1.5 * var(--pico-spacing));
 }
 
-code, kdb, pre {
+code, kbd, pre {
   font-size: 0.8em;
 }
 
+a[rel="external"]::after {
+  content: url('data:image/svg+xml,%3Csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20viewBox=%270%200%2024%2024%27%20fill=%27currentColor%27%3E%3Cpath%20d=%27M10%206V8H5V19H16V14H18V20C18%2020.5523%2017.5523%2021%2017%2021H4C3.44772%2021%203%2020.5523%203%2020V7C3%206.44772%203.44772%206%204%206H10ZM21%203V11H19L18.9999%206.413L11.2071%2014.2071L9.79289%2012.7929L17.5849%205H13V3H21Z%27%3E%3C/path%3E%3C/svg%3E');
+  width: 0.7em;
+  display: inline-block;
+  margin-left: 0.2em;
+  vertical-align: middle;
+}
+
 /*
  * Admonitions
  */
diff --git a/themes/bcarlin/layouts/_markup/render-link.html b/themes/bcarlin/layouts/_markup/render-link.html
new file mode 100644
index 0000000..d3cddfa
--- /dev/null
+++ b/themes/bcarlin/layouts/_markup/render-link.html
@@ -0,0 +1,8 @@
+{{- $u := urls.Parse .Destination -}}
+<a href="{{ .Destination | safeURL }}"
+  {{- with .Title }} title="{{ . }}"{{ end -}}
+  {{- if $u.IsAbs }} rel="external"{{ end -}}
+>
+  {{- with .Text }}{{ . }}{{ end -}}
+</a>
+{{- /* chomp trailing newline */ -}}