{{/* Emits PREVIOUS and NEXT buttons based on the pages in the current directory,
    ordered by page weight.
*/}}

{{ $currentPage := .Page }}

{{/* Get the pages in the current directory. */}}
{{ $unsortedPages := slice $currentPage }}
{{ if eq $currentPage.File.Dir $currentPage.Parent.File.Dir }}
    {{ $unsortedPages = $unsortedPages | append $currentPage.Parent }}
{{ end }}
{{ range $index, $page := .Page.CurrentSection.Pages }}
    {{ if and (gt $page.Weight 0) (ne $page.RelPermalink $currentPage.RelPermalink) }}
        {{ $unsortedPages = $unsortedPages | append $page }}
    {{ end }}
{{ end }}

{{/* Sort by weight. */}}
{{ $pages := sort $unsortedPages "Weight" }}

{{/* Set the first and last indexes. */}}
{{ $first := 0 }}
{{ $last := sub (len $pages) 1 }}

{{/* Determine the index of the current step. */}}
{{ $step := -1 }}
{{ range $index, $element := $pages }}
    {{ if eq $element.RelPermalink $currentPage.RelPermalink }}
        {{ $step = $index }}
    {{ end }}
{{ end }}


<div class="mt-6">
    {{ if ne $step $first }}
        {{ $prev := index $pages (sub $step 1) }}
        <a data-track="previous-step" class="btn btn-secondary" href="{{ $prev.RelPermalink }}">&larr; Previous Step</a>
    {{ end }}
    {{ if ne $step $last }}
        {{ $next := index $pages (add $step 1) }}
        <a data-track="next-step" class="btn" href="{{ $next.RelPermalink }}">{{ $next.LinkTitle }} &rarr;</a>
    {{ end }}
</div>