partial.sidebar.html

{{ $s := newScratch }}

{{/*  ARCHIVE  */}}
{{ $s.Set "archive" slice }}
{{ $s.Set "years" slice }}
{{ range sort (index .Site.Taxonomies "blog/archive") "Page.Title" "desc" }}
    {{ $splitted_date := split .Page.Title "/" }}
    {{ $year := index $splitted_date 0 }}
    {{ $month := index $splitted_date 1 }}

    {{ if not (in ($s.Get "years") $year) }}
        {{ $s.Add "years" $year }}
        {{ $s.Set $year slice }}
    {{ end }}

    {{ $s.Add $year (dict "month" $month "count" .Count) }}    
{{ end }}

{{/* IF POST PAGE|TAXONOMY, GET CURRENT YEAR */}}
{{ $s.Set "current_page_year" 1 }}
{{ if eq .Page.Kind "page" }}
  {{/* IF IT IS A CONTENT PAGE, GET IT'S ARCHIVE YEAR INDICATOR */}}
  {{ $s.Set "current_page_year" (index (split ($.Page.Param "blog/archive") "/") 0) }}
{{ else if eq .Page.Kind "taxonomy" }}
  {{/* IF IT IS A TAXONOMY ROLLUP PAGE FOR PAGES, GET IT'S YEAR */}}
  {{ if eq .Page.Data.Singular "blog/archive" }}
    {{ $s.Set "current_page_year" (index (split .Page.Data.Term "/") 0)}}
   {{ end }}
{{ end }}

<div class="widget">
  <h1 class="mb-0">BLOG POST ARCHIVES</h1>
  <div class="accordion" id="accordion">
    {{ $s.Set "is_blog_archive_open" false }}
    {{ range $index, $year := $s.Get "years" }}
      {{ if eq ($s.Get "current_page_year") $year }}
        {{ $s.Set "is_blog_archive_open" true }}
      {{ else if and (eq ($s.Get "current_page_year") 1) (eq $index 0) }}
        {{ $s.Set "is_blog_archive_open" true }}
      {{ else }}
        {{ $s.Set "is_blog_archive_open" false }}
      {{ end }}
      {{ $isOpen := $s.Get "is_blog_archive_open" }}
      <div>
        <div class="header" id="heading-{{.}}">
          <button class="btn btn-link {{if not $isOpen}}collapsed{{end}}" type="button" data-toggle="collapse" data-target="#collapse-{{$year}}" aria-expanded="{{ $isOpen }}" aria-controls="collapse-{{$year}}">
            {{ $year }}
          </button>
        </div>
      
        <div class="body {{if not $isOpen}}collapse{{else}}show{{end}}" id="collapse-{{$year}}" aria-labelledby="heading-{{$year}}" data-parent="#accordion">
          <ul class="archive-month-list">
            {{ range sort ($s.Get $year) "month" "desc" }}
              {{ $month := cond (lt .month 10) (print 0 .month) .month }}
              <li><a href="/blog/archive/{{$year}}/{{.month}}">{{ dateFormat "January" (print "2019-" $month "-01") }}</a></li>
            {{ end }}
          </ul>
        </div>
      </div>
    {{end}}
  </div>
</div>