Hugo shortcode to resize an image and rotate using Exif data

img.html

{{ $src := .Page.Resources.GetMatch (printf "*%s*" (.Get "src")) }}

{{ if eq $src nil }}
    {{ $src = .Page.Parent.Resources.GetMatch (printf "*%s*" (.Get "src")) }}
{{ end }}

{{ if not (eq $src nil) }}

    {{ $rotateBy := default "" }}

    {{ $thumb := "150x150" }}
    {{ $default := "400x" }}

    {{ with $src }}
        {{/* If the exif data is missing */}}
        {{ $orientation := 1 }}
        {{ if in "jpg tiff" .MediaType.SubType }}
            {{ with .Exif }}
              {{ $orientation = .Tags.Orientation }}
            {{ end }}
        {{ end }}
        {{/* https://sirv.com/help/articles/rotate-photos-to-be-upright/#EXIF_orientation_values*/}}
        {{ if eq $orientation 1 }}
          {{/* Do nothing, image is right-side up */}}
        {{ else if (eq $orientation 2) }}
            {{/* Do nothing back to front */}}
        {{ else if (eq $orientation 3) }}
            {{/* Upside down */}}
            {{ $rotateBy = "r180" }}
        {{ else if (eq $orientation 4) }}
            {{/* Upside down and back to front */}}
            {{ $rotateBy = "r180" }}
        {{ else if (eq $orientation 5) }}
            {{/* On its side */}}
            {{ $rotateBy = "r270" }}
        {{ else if (eq $orientation 6) }}
            {{/* On its side and back to front */}}
            {{ $rotateBy = "r270" }}
        {{ else if (eq $orientation 7) }}
            {{ $rotateBy = "r90" }}
        {{ else if (eq $orientation 8) }}
            {{ $rotateBy = "r90" }}
        {{ end }}
    {{ end }}

    {{ .Scratch.Set "thumb" ($src.Resize (printf "%s %s" $thumb $rotateBy)) }}
    {{ .Scratch.Set "default" ($src.Resize (printf "%s %s" $default $rotateBy)) }}
    {{ $thumb := .Scratch.Get "thumb" }}
    {{ $default := .Scratch.Get "default" }}

    {{ $type := "default" }}
    {{ with .Get "type" }}
        {{ $type = . }}
    {{ end }}

    <img
    {{ if eq $type "thumb" }}
      src="{{ $thumb.RelPermalink }}"
    {{ else }}
      src="{{ $default.RelPermalink }}"
    {{ end }}
    {{ with .Get "alt" }}alt="{{.}}"{{ else }}alt=""{{ end }}
    {{ with .Get "class" }}class="{{.}}"{{ end }}
    >
{{ end }}