Move a bunch of shortcodes and partials back from the platters theme

layouts/partials/photos/list.html

@@ -0,0 +1,9 @@
+{{ $thumbnailResourcesNames := slice "thumbnail" "Thumbnail" "thumbnail.jpg" "Thumbnail.jpg" }}
+{{ with index .Params "thumbnail" }}
+    {{ $thumbnailResourcesNames = $thumbnailResourcesNames | append . }}
+{{ end }}
+
+{{ $imageResources := .Resources.ByType "image" }}
+{{ $photos := where $imageResources "Name" "not in" $thumbnailResourcesNames }}
+
+{{ return $photos }}

layouts/partials/photos/thumbnail.html

@@ -0,0 +1,50 @@
+{{/*
+  Renders a photo thumbnail. If neither a target height or target width are
+  given, and the image is already in the correct orientation, no image
+  processing is performed.
+
+  Arguments
+  ---------
+  "Page" : A reference to the current Page
+  "Height" : The target height of the image
+  "Width" : The target width of the image
+
+  Returns
+  -------
+  The processed thumbnail image resource
+*/}}
+
+{{- $thumbnailResource := .Page.Resources.GetMatch
+                            (index .Page.Params "thumbnail" | default "[tT]humbnail*")
+                        | default (index (.Page.Resources.ByType "image") 0) -}}
+
+{{- if not $thumbnailResource -}}
+  {{- errorf "No thumbnail available for %s" .Page.Permalink }}
+{{- end -}}
+
+{{ $orientation := partial "image-utilities/orientation-angle.html" $thumbnailResource }}
+
+{{ $targetWidth := 0 }}
+{{ with .Width }}
+  {{ $targetWidth = . }}
+{{ else }}
+  {{ $targetWidth = $thumbnailResource.Width }}
+{{ end }}
+
+{{ $targetHeight := 0 }}
+{{ with .Height }}
+  {{ $targetHeight = . }}
+{{ else }}
+  {{ $targetHeight = $thumbnailResource.Height }}
+{{ end }}
+
+{{ $thumbnail := false }}
+{{ if not (and (eq $orientation 0)
+               (eq $targetWidth $thumbnailResource.Width)
+               (eq $targetHeight $thumbnailResource.Height)) }}
+  {{ $thumbnail = $thumbnailResource.Fit (printf "%dx%d r%d" $targetWidth $targetHeight (sub 360 $orientation)) }}
+{{ else }}
+  {{ $thumbnail = $thumbnailResource }}
+{{ end }}
+
+{{ return $thumbnail }}