Implement collapsing consecutive posts in a series

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/index.html

@@ -2,9 +2,10 @@
 {{ .Content }}
 
 {{ i18n "recentPosts" }}:
+{{ partial "uniquebyseries.html" (dict "scratch" .Scratch) }}
 <ul class="post-list">
-    {{ range first 10 (where (where .Site.Pages.ByDate.Reverse "Section" "blog") ".Kind" "!=" "section") }}
-    {{ partial "post.html" (dict "page" .) }}
+    {{ range first 10 (.Scratch.Get "pages") }}
+    {{ partial "post.html" (dict "page" . "linkSeries" true) }}
     {{ end }}
 </ul>
 

layouts/partials/post.html

@@ -15,4 +15,13 @@
     </p>
     {{ end }}
     <p class="post-preview">{{ .page.Summary }} {{ if .page.Truncated }}...{{ end }}</p>
+    {{- if .linkSeries -}}
+    {{- $term := index (.page.GetTerms "series") 0 -}}
+    {{- with $term -}}
+    <p class="series-link">
+    {{- partial "icon.html" "corner-down-right" -}}
+    {{- i18n "latestInSeries" }} <a href="{{ $term.Permalink }}">{{ $term.Title }}</a>
+    </p>
+    {{- end -}}
+    {{- end }}
 </li>

layouts/partials/uniquebyseries.html

@@ -0,0 +1,14 @@
+{{- $scratch := .scratch -}}
+{{- $scratch.Set "pages" slice -}}
+{{- $tmpScratch := newScratch -}}
+{{- range $post := (where (where site.Pages.ByDate.Reverse "Section" "blog") ".Kind" "!=" "section") -}}
+{{- $term := index ($post.GetTerms "series") 0 -}}
+{{- if $term -}}
+{{- if not ($tmpScratch.Get $term.Permalink) -}}
+{{- $tmpScratch.Set $term.Permalink true -}}
+{{- $scratch.Add "pages" $post -}}
+{{- end -}}
+{{- else -}}
+{{- $scratch.Add "pages" $post -}}
+{{- end -}}
+{{- end -}}