{{ with .Params.canonical_url -}}
{{- else -}}
{{ $canonicalURL := .Permalink -}}
{{ $defaultLang := "en" -}}
{{ if and (ne .Language.Lang $defaultLang) .File -}}
{{/* This page is in a non-default-language section */ -}}
{{ $pagePath := strings.TrimPrefix (add hugo.WorkingDir "/content/") .File.Filename -}}
{{ if hasPrefix $pagePath $defaultLang -}}
{{/* This page is actually a default-language fallback page. Use the link
to the origin of the fallback page as canonical reference. */ -}}
{{ $translationPages := where .Translations "Lang" $defaultLang -}}
{{ $translation := index $translationPages 0 -}}
{{ with $translation -}}
{{ $canonicalURL = .Permalink -}}
{{ end -}}
{{ end -}}
{{ end -}}
{{- end -}}
{{/* */ -}}