From a292f0f9fe26b8a9f034875d333f8f624e24fb53 Mon Sep 17 00:00:00 2001
From: Fredrik Jonsson <frjo@xdeb.org>
Date: Wed, 23 Jun 2021 10:17:53 +0200
Subject: [PATCH] Add srcset support to figure and img shortcodes.

---
 layouts/shortcodes/figure.html | 12 +++++++++++-
 layouts/shortcodes/img.html    | 12 +++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/layouts/shortcodes/figure.html b/layouts/shortcodes/figure.html
index e3c16bc..683b697 100644
--- a/layouts/shortcodes/figure.html
+++ b/layouts/shortcodes/figure.html
@@ -7,6 +7,8 @@
 {{ $link := .Get "link" -}}
 {{ $size := .Get "size" -}}
 {{ $src := .Get "src" -}}
+{{ $srcset := .Get "srcset" -}}
+{{ $srcsetw := (slice) }}
 {{ $title := .Get "title" -}}
 {{ $width := .Get "width" -}}
 {{ $maxwidth := .Site.Params.imageMaxWidth -}}
@@ -24,6 +26,14 @@
     {{ $realwidth = $original.Width -}}
     {{ $realheight = $original.Height -}}
   {{ end -}}
+  {{ if $srcset -}}
+    {{ range $set := split $srcset " " -}}
+      {{ $image := $original.Resize (printf "%sx" $set) -}}
+      {{ $srcsetw = $srcsetw | append (printf "%s %sw" $image.RelPermalink $set) }}
+    {{ end }}
+    {{ $width = "" -}}
+    {{ $height = "" -}}
+  {{ end -}}
 {{ else if and $src (fileExists (add "/static" $src)) -}}
   {{ with (imageConfig (add "/static" $src)) -}}
     {{ $realwidth = .Width -}}
@@ -54,7 +64,7 @@
 {{ end -}}
 <figure class="image{{ with $class }} {{ . }}{{ end }}">
 {{ with $link }}<a href="{{ . }}">{{ end -}}
-<img src="{{ $src }}"{{ with $alt }} alt="{{ . }}"{{ end }}{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}>
+<img src="{{ $src }}"{{ with $srcsetw }} srcset="{{ delimit  .  ", " }}"{{ end }}{{ with $alt }} alt="{{ . }}"{{ end }}{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}>
 {{- if $link }}</a>{{ end }}
 {{ if or $title $caption $attr -}}
 <figcaption>
diff --git a/layouts/shortcodes/img.html b/layouts/shortcodes/img.html
index e7caff2..6bf7bd2 100644
--- a/layouts/shortcodes/img.html
+++ b/layouts/shortcodes/img.html
@@ -4,6 +4,8 @@
 {{ $link := .Get "link" -}}
 {{ $size := .Get "size" -}}
 {{ $src := .Get "src" -}}
+{{ $srcset := .Get "srcset" -}}
+{{ $srcsetw := (slice) }}
 {{ $width := .Get "width" -}}
 {{ $maxwidth := .Site.Params.imageMaxWidth -}}
 {{ $realwidth := 0 -}}
@@ -20,6 +22,14 @@
     {{ $realwidth = $original.Width -}}
     {{ $realheight = $original.Height -}}
   {{ end -}}
+  {{ if $srcset -}}
+    {{ range $set := split $srcset " " -}}
+      {{ $image := $original.Resize (printf "%sx" $set) -}}
+      {{ $srcsetw = $srcsetw | append (printf "%s %sw" $image.RelPermalink $set) }}
+    {{ end }}
+    {{ $width = "" -}}
+    {{ $height = "" -}}
+  {{ end -}}
 {{ else if and $src (fileExists (add "/static" $src)) -}}
   {{ with (imageConfig (add "/static" $src)) -}}
     {{ $realwidth = .Width -}}
@@ -49,5 +59,5 @@
   {{ $height = (math.Round $height) -}}
 {{ end -}}
 {{ with $link }}<a class="image-link" href="{{ . }}">{{ end -}}
-<img class="image{{ with $class }} {{ . }}{{ end }}" src="{{ $src }}"{{ with $alt }} alt="{{ . }}"{{ end }}{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}>
+<img class="image{{ with $class }} {{ . }}{{ end }}" src="{{ $src }}"{{ with $srcsetw }} srcset="{{ delimit  .  ", " }}"{{ end }}{{ with $alt }} alt="{{ . }}"{{ end }}{{ with $width }} width="{{ . }}"{{ end }}{{ with $height }} height="{{ . }}"{{ end }}>
 {{- if $link }}</a>{{ end }}