{%- comment -%}
  Previous/Next pager following the sidebar order: top-level pages by
  nav_order, then the server, client, and extensions collections.
{%- endcomment -%}
{%- assign top_pages = site.html_pages | where_exp: "item", "item.nav_order" | sort: "nav_order" -%}
{%- assign server_docs = site.server | sort: "nav_order" -%}
{%- assign client_docs = site.client | sort: "nav_order" -%}
{%- assign extensions_docs = site.extensions | sort: "nav_order" -%}
{%- assign ordered_pages = top_pages | concat: server_docs | concat: client_docs | concat: extensions_docs -%}
{%- assign pager_state = "before" -%}
{%- assign prev_page = nil -%}
{%- assign next_page = nil -%}
{%- for item in ordered_pages -%}
  {%- if pager_state == "current" -%}
    {%- assign next_page = item -%}
    {%- assign pager_state = "after" -%}
  {%- elsif item.url == page.url -%}
    {%- assign pager_state = "current" -%}
  {%- elsif pager_state == "before" -%}
    {%- assign prev_page = item -%}
  {%- endif -%}
{%- endfor -%}
{%- if pager_state != "before" -%}
<nav class="docs-pager" aria-label="Pager">
  {%- if prev_page %}
  <a class="docs-pager-link docs-pager-prev" href="{{ prev_page.url | relative_url }}">
    <span class="docs-pager-direction">Previous</span>
    <span class="docs-pager-title">
      {%- if prev_page.collection != page.collection -%}
        {%- if prev_page.collection == "server" -%}Building Servers · {% elsif prev_page.collection == "client" -%}Building Clients · {% elsif prev_page.collection == "extensions" -%}Extensions · {% endif -%}
      {%- endif -%}
      {{- prev_page.title -}}
    </span>
  </a>
  {%- endif -%}
  {%- if next_page %}
  <a class="docs-pager-link docs-pager-next" href="{{ next_page.url | relative_url }}">
    <span class="docs-pager-direction">Next</span>
    <span class="docs-pager-title">
      {%- if next_page.collection != page.collection -%}
        {%- if next_page.collection == "server" -%}Building Servers · {% elsif next_page.collection == "client" -%}Building Clients · {% elsif next_page.collection == "extensions" -%}Extensions · {% endif -%}
      {%- endif -%}
      {{- next_page.title -}}
    </span>
  </a>
  {%- endif %}
</nav>
{%- endif -%}