Workaround for Hugo: sorting pages by Czech alphabet (first 40 alpha chars)

partial.html

{{ $page := .Page }}

{{ range .pages }}
  {{ $alpha := "aábcčdďeéěfgh#iíjklmnňoópqrřsštťuúůvwxyýzž" }}
  {{ $title := substr (.Title | lower | replaceRE "ch" "#" | replaceRE (print "[^" $alpha "]") "") 0 40 }}

  {{ $sortStr := split $title  "" }}
  {{ $len := len $sortStr }}

  {{ $score := math.Pow 100 42 }}

  {{ range $index, $char := $sortStr }}
    {{/*  calc character rank */}}
    {{ $num := len (index (findRE (print "^.*" $char) $alpha) 0) }}

    {{/*  calc score */}}
    {{ $score = add $score (mul $num (math.Pow 100 (sub 40 $index))) }}
  {{ end }}

  {{ $sortKey := print (lang.NumFmt 0 $score "- .") $title }}

  {{ $page.Scratch.SetInMap "pages" $sortKey (dict "Title" .Title "Permalink" .Permalink "Params" .Params) }}
{{ end }}