hugo/tpl/tplimpl/embedded/templates/twitter_cards.html

{{- with $.Params.images -}}
<meta name="twitter:card" content="summary_large_image"/>
<meta name="twitter:image" content="{{ index . 0 | absURL }}"/>
{{ else -}}
{{- $images := $.Resources.ByType "image" -}}
{{- $featured := $images.GetMatch "*feature*" -}}
{{- if not $featured }}{{ $featured = $images.GetMatch "{*cover*,*thumbnail*}" }}{{ end -}}
{{- with $featured -}}
<meta name="twitter:card" content="summary_large_image"/>
<meta name="twitter:image" content="{{ $featured.Permalink }}"/>
{{- else -}}
{{- with $.Site.Params.images -}}
<meta name="twitter:card" content="summary_large_image"/>
<meta name="twitter:image" content="{{ index . 0 | absURL }}"/>
{{ else -}}
<meta name="twitter:card" content="summary"/>
{{- end -}}
{{- end -}}
{{- end }}
<meta name="twitter:title" content="{{ .Title }}"/>
<meta name="twitter:description" content="{{ with .Description }}{{ . }}{{ else }}{{if .IsPage}}{{ .Summary }}{{ else }}{{ with .Site.Params.description }}{{ . }}{{ end }}{{ end }}{{ end -}}"/>

{{- /* Deprecate site.Social.twitter in favor of site.Params.social.twitter */}}
{{- $twitterSite := "" }}
{{- with site.Params.social.twitter }}
  {{- $twitterSite = . }}
{{- else }}
  {{- with site.Social.twitter }}
    {{- $twitterSite = . }}
    {{- warnf "The social key in site configuration is deprecated. Use params.social.twitter instead." }}
  {{- end }}
{{- end }}

{{- with $twitterSite }}
<meta name="twitter:site" content="@{{ . }}"/>
{{- end }}