hugo-theme-bootstrap4-blog/layouts/_default/list.html

{{ define "main" }}

  {{ $paginator := .Paginate (where .Data.Pages "Type" "post") }}
  {{ range $paginator.Pages }}
   {{ .Render "summary" }}
  {{ end }}

  <nav class="blog-pagination">
    {{ if and (.Paginator.HasPrev) (.Paginator.HasNext) }}
    <h3>case 1</h3>
    <a class="btn btn-outline-primary" href="{{ .Paginator.Prev.URL }}" role="button">{{ i18n "paginatorPrevious" }}</a>
    <a class="btn btn-outline-primary" href="{{ .Paginator.Next.URL }}" role="button">{{ i18n "paginatorNext" }}</a>
    {{ end }}
    {{ if and (.Paginator.HasPrev) (not .Paginator.HasNext) }}
    <h3>case 2</h3>
    <a class="btn btn-outline-primary" href="{{ .Paginator.Prev.URL }}" role="button">{{ i18n "paginatorPrevious" }}</a>
    <a class="btn btn-outline-primary disabled" href="#" role="button" aria-disabled="true">{{ i18n "paginatorNext" }}</a>
    {{ end }}
    {{ if and (not .Paginator.HasPrev) (.Paginator.HasNext) }}
    <h3>case 3</h3>
    <a class="btn btn-outline-primary disabled" href="#" role="button" aria-disabled="true">{{ i18n "paginatorPrevious" }}</a>
    <a class="btn btn-outline-primary" href="{{ .Paginator.Next.URL }}" role="button">{{ i18n "paginatorNext" }}</a>
    {{ end }}
  </nav>
{{ end }}