{{- $page := .page -}}
{{- $by := .by | default "weight" -}}
{{- $order := .order | default "asc" -}}

{{- $pages := slice }}

{{- if eq $by "weight" }}
  {{- $pages = $page.Pages.ByWeight }}
{{- else if eq $by "date" }}
  {{- $pages = $page.Pages.ByDate }}
{{- else if eq $by "title" }}
  {{- $pages = $page.Pages.ByTitle }}
{{- else if eq $by "expiryDate" }}
  {{- $pages = $page.Pages.ByExpiryDate }}
{{- else if eq $by "publishDate" }}
  {{- $pages = $page.Pages.ByPublishDate }}
{{- else if eq $by "lastmod" }}
  {{- $pages = $page.Pages.ByLastmod }}
{{- else if eq $by "linkTitle" }}
  {{- $pages = $page.Pages.ByLinkTitle }}
{{- else if eq $by "length" }}
  {{- $pages = $page.Pages.ByLength }}
{{- else }}
  {{- warnf "sort-pages: unknown sort field %q" $by -}}
  {{- $pages = $page.Pages }}
{{ end -}}

{{- if eq $order "desc" }}
  {{- $pages = $pages.Reverse }}
{{- end -}}

{{- return $pages -}}