lots of random cleanup & organization

layouts/partials/functions/prepare-meta.html

@@ -0,0 +1,39 @@
+{{/* Strip any markdown styling from page title for use in meta tags */}}
+{{- with .Title -}}
+  {{- $.Scratch.Set "plainTitle" (. | markdownify | htmlUnescape | plainify) -}}
+{{- end -}}
+
+{{/* If this is a page/post, link View Source to specific file on GitHub; otherwise, just link to repo homepage */}}
+{{- with .Site.Params.social.githubRepo -}}
+  {{- $githubURL := print "https://github.com/" . -}}
+  {{- if not $.IsPage -}}
+    {{- $.Scratch.Set "sourceURL" $githubURL -}}
+  {{- else -}}
+    {{- $.Scratch.Set "sourceURL" (print $githubURL "/blob/main/content/" $.File.Path) -}}
+  {{- end -}}
+{{- end -}}
+
+{{/* Chooses and initializes various images for use by JSON schema & open graph tags */}}
+{{/* Author image (default) */}}
+{{- with .Site.Data.manifest -}}
+  {{- with index . $.Site.Author.image -}}
+    {{- $.Scratch.Set "authorImage" (dict "Permalink" (absURL .src) "Width" 1200 "Height" 1200 "MediaType" "image/jpeg") -}}
+  {{- end -}}
+{{- end -}}
+{{/* Page image (via frontmatter) */}}
+{{- with .Params.image -}}
+  {{- with $.Page.Resources.GetMatch . -}}
+    {{- $.Scratch.Set "pageImage" . -}}
+  {{- end -}}
+{{- else -}}
+  {{/* Fallback to author image set above */}}
+  {{- with $.Scratch.Get "authorImage" -}}
+    {{- $.Scratch.Set "pageImage" . -}}
+  {{- end -}}
+{{- end -}}
+{{/* Site logo */}}
+{{- with .Site.Data.manifest -}}
+  {{- with index . $.Site.Params.image -}}
+    {{- $.Scratch.Set "logoImage" (dict "Permalink" (absURL .src) "Width" 2048 "Height" 2048 "MediaType" "image/png") -}}
+  {{- end -}}
+{{- end -}}