{%- comment -%}
  Include as: {%- include components/nav/pages.html pages=page_array all=bool -%}
  Depends on: include.pages.
  Results in: HTML for the main navigation when all is nil or false;
    adds links to pages excluded from the main navigation when all is true.
  Includes: components/nav/links.html
  Assigns to:
    nav_parenthood, nav_top_nodes, nav_top_node_titles, nav_ancestors.
{%- endcomment -%}

{%- assign nav_parenthood = include.pages
      | where_exp: "item", "item.title != nil" | group_by: "parent" -%}

{%- assign nav_top_nodes = nav_parenthood
      | where_exp: "item", "item.name == ''" | map: "items" | first -%}

{%- include components/nav/sorted.html pages=nav_top_nodes -%}

{% assign nav_top_node_titles = nav_top_nodes | map: "title" -%}

{%- assign nav_ancestors = "" | split: "" -%}

{%- include components/nav/links.html pages=nav_sorted ancestors=nav_ancestors all=include.all -%}