Complete hugo img partial using page resources

hugo-img-partial.html

{{ $image := .Params.image}}
{{ $media := (.Site.GetPage "page" "media").Resources }}
{{ $original := index ($media.Match (printf "%s" $image)) 0 }}
{{ $width := $original.Width}}
{{ $intWidth := int $width }}
{{ $sizes := .Params.sizes}}
{{ $options := .Params.options}}

{{ if le (len $sizes) 1 }}
  {{ $oneSize := index $sizes 0}}

  {{- if ge $oneSize 10 -}}
    {{- $img := ($original.Resize (printf "%sx %s" $oneSize $options)) -}}
    {{ $.Scratch.Add "src" $img.RelPermalink }}
  {{- else -}}
    {{- $floatSize := float $oneSize -}}
    {{- $newSize := (mul $intWidth $floatSize) -}}
    {{- $int2string := string (math.Round $newSize) -}}
    {{- $img := ($original.Resize (printf "%sx %s" $int2string $options)) -}}
    {{ $.Scratch.Add "src" $img.RelPermalink }}
  {{- end -}}

  <img
  {{with .Params.class}}class="{{.}}"{{end}}
  src="{{ .Scratch.Get "src" }}"
  {{with .Params.alt | default $original.Title}}alt="{{.}}"{{end}}>
{{else}}
  {{ range $i, $sort := (seq (len $sizes)) }}
    {{- if ge (index $sizes $i) 10 -}}
      {{ $.Scratch.Add "sort" (slice (index $sizes $i)) }}
    {{ else }}
      {{- $floatSize := float (index $sizes $i) -}}
      {{- $newSize := (math.Round (mul $intWidth $floatSize)) -}}
      {{- $int2string := string $newSize -}}
      {{ $.Scratch.Add "sort" (slice $int2string) }}
    {{ end }}
  {{ end }}
  {{ $sort := sort (.Scratch.Get "sort") }}

  {{- range $i, $num := (seq (len $sort )) -}}
    {{- $imgSize := index $sort $i -}}
    {{- $img := ($original.Resize (printf "%sx %s" $imgSize $options)) -}}
    {{ $.Scratch.Add "sizes" (slice $img.Width) }}
    {{- $int2string := string $img.Width -}}
    {{ $.Scratch.Add "string" (slice (printf "%s %sw" $img.RelPermalink $int2string)) }}
  {{- end -}}

  <img
  {{with .Params.class}}class="{{.}}"{{end}}
  src="{{ $original.RelPermalink }}"
  srcset="{{delimit (.Scratch.Get "string") ", " }}"
  sizes="
    {{- $last := sub (len (.Scratch.Get "sizes")) 1 -}}
    {{- range first $last (.Scratch.Get "sizes") -}}
    (max-width: {{ . }}px) {{ sub . 40 }}px,
    {{end}}
    {{- index (.Scratch.Get "sizes") (sub (len (.Scratch.Get "sizes")) 1) -}}px"
  {{with .Params.alt | default $original.Title}}alt="{{.}}"{{end}}>
{{end}}