hugo: improve metadata rendering for markdown output

Render title and related pages as front matter

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

Author: dvdksn

layouts/_default/list.markdown.md

@@ -1,5 +1,36 @@
-# {{ .Title }}
+---
+title: {{ .Title }}
+url: {{ .Permalink }}
+{{- range .Ancestors }}
+  {{- if and (not .IsHome) .Permalink }}
+parent:
+  title: {{ .Title }}
+  url: {{ .Permalink }}
+  {{- break }}
+  {{- end }}
+{{- end }}
+{{- if .Ancestors }}
+breadcrumbs:
+{{- range .Ancestors.Reverse }}
+  {{- if and (not .IsHome) .Permalink }}
+  - title: {{ .Title }}
+    url: {{ .Permalink }}
+  {{- end }}
+{{- end }}
+  - title: {{ .Title }}
+    url: {{ .Permalink }}
+{{- end }}
+{{- $children := where .Pages "Permalink" "ne" "" }}
+{{- if $children }}
+children:
+{{- range $children }}
+  - title: {{ .Title }}
+    url: {{ .Permalink }}
+    {{- with .Description }}
+    description: {{ . }}
+    {{- end }}
+{{- end }}
+{{- end }}
+---
+
 {{ .RenderShortcodes }}
-{{ range where .Pages "Permalink" "ne" "" }}
-- [{{ .Title }}]({{ .Permalink }})
-{{ end }}

layouts/_default/single.markdown.md

@@ -1,2 +1,35 @@
-# {{ .Title }}
+---
+title: {{ .Title }}
+url: {{ .Permalink }}
+{{- range .Ancestors }}
+  {{- if and (not .IsHome) .Permalink }}
+parent:
+  title: {{ .Title }}
+  url: {{ .Permalink }}
+  {{- break }}
+  {{- end }}
+{{- end }}
+{{- if .Ancestors }}
+breadcrumbs:
+{{- range .Ancestors.Reverse }}
+  {{- if and (not .IsHome) .Permalink }}
+  - title: {{ .Title }}
+    url: {{ .Permalink }}
+  {{- end }}
+{{- end }}
+  - title: {{ .Title }}
+    url: {{ .Permalink }}
+{{- end }}
+{{- with .NextInSection }}
+next:
+  title: {{ .Title }}
+  url: {{ .Permalink }}
+{{- end }}
+{{- with .PrevInSection }}
+prev:
+  title: {{ .Title }}
+  url: {{ .Permalink }}
+{{- end }}
+---
+
 {{ .RenderShortcodes }}