refactor: Move thumbnail list template to partial template file

layouts/_default/list.html

@@ -15,24 +15,8 @@
 
 
             <div class="card-body">
-              {{/* Thumbnail images should be stored as 'thumbnail'.* in the page bundle, but
-                historically they might have been referenced as 'thumbnail' in the front
-                matter, or (even more historically) as 'cardImage'. Use scratch to
-                normalize all these different systems.
-              */}}
-              {{ $bundleGlob := "thumbnail.*" }}
-              {{ $frontThumbGlob := print "images/" (.Params.thumbnail) ".*" }}
-              {{ $frontCardGlob := print "images/" (.Params.cardImage) ".jpg" }}
-              {{ $allThumbnailGlob := print "{" $frontThumbGlob "," $frontCardGlob "," $bundleGlob "}" }}
-              {{ with .Resources.GetMatch $allThumbnailGlob }}
-                {{ $thumbnail := . }}
-                {{ $thumbnailResized := $thumbnail.Resize "600x" }}
-                <img
-                  class="img img-thumbnail float-start me-3 md-max-width-33"
-                  src="{{ $thumbnailResized.RelPermalink }}"
-                  alt="Thumbnail of {{ .Title }}"
-                />
-              {{ end }}
+              {{ partial "list-item-thumbnail" . }}
+
               {{/* Prefer full-text links over local ones */}}
               {{ $link := default .RelPermalink (index .Params "link") }}
               <a href="{{ $link }}"><h3 class="card-title">{{ .Title }}</h3></a>

layouts/partials/list-item-thumbnail.html

@@ -0,0 +1,18 @@
+{{/* Thumbnail images should be stored as 'thumbnail'.* in the page bundle, but
+  historically they might have been referenced as 'thumbnail' in the front
+  matter, or (even more historically) as 'cardImage'. Use scratch to
+  normalize all these different systems.
+*/}}
+{{ $bundleGlob := "thumbnail.*" }}
+{{ $frontThumbGlob := print "images/" (.Params.thumbnail) ".*" }}
+{{ $frontCardGlob := print "images/" (.Params.cardImage) ".jpg" }}
+{{ $allThumbnailGlob := print "{" $frontThumbGlob "," $frontCardGlob "," $bundleGlob "}" }}
+{{ with .Resources.GetMatch $allThumbnailGlob }}
+  {{ $thumbnail := . }}
+  {{ $thumbnailResized := $thumbnail.Resize "600x" }}
+  <img
+    class="img img-thumbnail float-start me-3 md-max-width-33"
+    src="{{ $thumbnailResized.RelPermalink }}"
+    alt="Thumbnail of {{ .Title }}"
+  />
+{{ end }}