{{ $orientation := .Exif.Tags.Orientation }}
{{/* EXIF orientation is specified as an integer corresponding to a 90º rotation. */}}
{{ $angle := 0 }}
{{ if in (slice 1 2) $orientation }}
    {{ $orientation = 0 }}
{{ else if in (slice 3 4) $orientation }}
    {{ $orientation = 180 }}
{{ else if in (slice 5 6) $orientation }}
    {{ $orientation = 90 }}
{{ else if in (slice 7 8) $orientation }}
    {{ $orientation = 270 }}
{{ end }}
{{ return $orientation }}