refactor: resource attribution

layouts/partials/media/attr.html

@@ -0,0 +1,58 @@
+<!--
+    Partial to render attribution for a resource.
+
+    @params sc Site context.
+    @params pc Page context.
+    @params attr Resource attribution.
+    @params attr_link  Resource link. Optional.
+    @params attr_license  Resource license. Optional.
+    @params attr_license_link  Resource license link. Optional.
+-->
+
+<!-- Validation -->
+
+{{- if ( not ( isset . "sc" ) ) -}}
+  {{- errorf "No site context received" -}}
+{{- end -}}
+
+{{- if ( not ( isset . "pc" ) ) -}}
+  {{- errorf "No page context received (%q)" .sc.Page.File.Dir -}}
+{{- end -}}
+
+{{- if ( not ( isset . "params" ) ) -}}
+  {{- errorf "No params given (%q)" .pc.File.Path -}}
+{{- end -}}
+
+{{- if ( not ( isset .params "attr" ) ) -}}
+  {{- errorf "No attr given (%q)" .pc.File.Path -}}
+{{- end -}}
+
+<!-- Variable assignment -->
+
+{{- $attr := .params.attr -}}
+{{- $attr_link := .params.attrlink -}}
+{{- $attr_licence := .params.attrlicence -}}
+{{- $attr_licence_link := .params.attrlicencelink -}}
+
+<!-- Rendering -->
+
+<p class="attr">
+    {{- with $attr_link -}}
+      <a href="{{ . }}" target="_blank" rel="noopener">
+    {{- end -}}
+      {{- $attr | safeHTML -}}
+    {{- if $attr_link -}}
+      </a>
+    {{- end -}}
+
+    {{- if $attr_licence }} (
+        {{- with ( index .sc.Site.Data.licences $attr_licence ) -}}
+          <a href="{{ . }}" target="_blank" rel="noopener">
+        {{- end -}}
+        {{- $attr_licence -}}
+        {{- with ( index .sc.Site.Data.licences $attr_licence ) -}}
+          </a>
+        {{- end -}}
+    )
+    {{- end -}}
+<p>