hugo-theme-relearn/layouts/partials/_relearn/pagePrev.gotmpl

{{- $prev := "" }}
{{- if eq .Page.Kind "term" }}
  {{- /* go to previous term page or taxonomy page if it is the first term */}}
  {{- $taxonomy_page := .Site.GetPage .Data.Plural }}
  {{- $pages := partialCached "partials/_relearn/pagesTaxonomy.gotmpl" $taxonomy_page $taxonomy_page.Path }}
  {{- $prev = partial "inline/prev-term" (dict "collection" $pages "item" .) | default $taxonomy_page }}
{{- else if eq .Page.Kind "taxonomy" }}
  {{- $prev = .Site.Home }}
{{- else if eq .Page.Kind "home" }}
  {{- /* no prev here */}}
{{- else }}
  {{- $prev = or (partial "inline/prev_page" .) .Site.Home }}
{{- end }}
{{- return $prev }}

{{- define "partials/inline/prev-term" }}
  {{- $collection := .collection }}
  {{- $item := .item }}
  {{- $last := "" }}
  {{- $result := "" }}
  {{- range $collection }}
    {{- if eq $item .Page.Page }}
      {{- $result = $last }}
      {{- break }}
    {{- end }}
    {{- $last = .Page.Page }}
  {{- end }}
  {{- return $result }}
{{- end }}

{{- define "partials/inline/prev_page" }}
  {{- $previousVisible := "" }}
  {{- $currentNode := . }}
  {{- with partial "inline/parent" $currentNode }}
    {{- $parent := . }}
    {{- $pages := partialCached "_relearn/pages.gotmpl" (dict "page" $parent) $parent.Path }}
    {{- $previousSibling := partial "inline/prev_sibling" (dict "siblings" $pages "currentNode" $currentNode) }}
    {{- if $previousSibling }}
      {{- $previousVisible = partial "inline/rightmost_descendant" $previousSibling }}
      {{- if not $previousVisible }}
        {{- if $previousSibling.RelPermalink }}
          {{- $previousVisible = $previousSibling }}
        {{- else }}
          {{- $previousVisible = partial "inline/prev_page" $previousSibling }}
        {{- end }}
      {{- end }}
    {{- else }}
      {{- if $parent.RelPermalink }}
        {{- $previousVisible = $parent }}
      {{- else }}
        {{- $previousVisible = partial "inline/prev_page" $parent }}
      {{- end }}
    {{- end }}
  {{- end }}
  {{- return $previousVisible }}
{{- end }}

{{- define "partials/inline/prev_sibling" }}
  {{- $previousSibling := "" }}
  {{- $siblings := .siblings }}
  {{- $currentNode := .currentNode }}
  {{- range $siblings }}
    {{- if eq . $currentNode }}
      {{- break }}
    {{- else if not (or (.Params.hidden) (eq .Title "")) }}
      {{- $previousSibling = . }}
    {{- end }}
  {{- end }}
  {{- return $previousSibling }}
{{- end }}

{{- define "partials/inline/rightmost_descendant" }}
  {{- $rightmostVisible := . }}
  {{- $pages := (partialCached "_relearn/pages.gotmpl" (dict "page" $rightmostVisible) $rightmostVisible.Path) | collections.Reverse }}
  {{- range $pages }}
    {{- if not (or (.Params.hidden) (eq .Title "")) }}
      {{- with partial "inline/rightmost_descendant" . }}
        {{- if .RelPermalink }}
          {{- $rightmostVisible = . }}
          {{- break }}
        {{- end }}
      {{- end }}
    {{- end }}
  {{- end }}
  {{- return $rightmostVisible }}
{{- end }}

{{- define "partials/inline/parent" }}
  {{- $nonheadless := "" }}
  {{- $page := . }}
  {{- $parent := .Parent }}
  {{- if not (partial "_relearn/pageIsSpecial.gotmpl" $page) }}
    {{- with $parent }}
      {{- $pages := partialCached "_relearn/pages.gotmpl" (dict "page" .) .Path }}
      {{- range $pages }}
        {{- if eq . $page }}
          {{- $nonheadless = $parent }}
          {{- break }}
        {{- end }}
      {{- end }}
    {{- else }}
      {{- $nonheadless = $parent }}
    {{- end }}
  {{- end }}
  {{- return $nonheadless }}
{{- end }}