{{ if .IsPage }}
  {{ with .Params.images }}
    <!-- Twitter summary card with large image must be at least 280x150px -->
    <meta name="twitter:card" content="summary_large_image"/>
    <meta name="twitter:image:src" content="{{ index . 0 | absURL }}"/>
    {{ else }}
    <meta name="twitter:card" content="summary"/>
    {{ if .Site.Params.twitterCardImage }}
      <meta name="twitter:image" content="{{ .Site.Params.twitterCardImage | absURL }}" />
      {{ else }}
      <meta name="twitter:image" content="{{ .Site.BaseURL }}images/avatar.png" />
    {{ end }}
  {{ end }}
  <!-- Twitter Card data -->
  <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 }}"/>
  {{ with .Site.Params.twitter }}
    <meta name="twitter:site" content="@{{ . }}"/>
  {{ end }}
  {{ range .Site.Authors }}
    {{ with .twitter }}
      <meta name="twitter:creator" content="@{{ . }}"/>
    {{ end }}
  {{ end }}
  <!-- no post authors, show site author -->
  {{ if eq (len .Site.Authors) 0 }}
    <meta name="twitter:creator" content="@{{ .Site.Params.author }}"/>
  {{ end }}

{{ else }}

  <meta name="twitter:card" content="summary" />
  {{ with .Site.Params.twitter }}
    <meta name="twitter:site" content="@{{ . }}"/>
  {{ end }}
  {{ with .Site.Params.author }}
    <meta name="twitter:creator" content="@{{ . }}"/>
  {{ end }}
  <meta name="twitter:title" content="{{ .Site.Title }}"/>
  <meta name="twitter:description" content="{{ with .Description }}{{ . }}{{ else }}{{if .IsPage}}{{ .Summary }}{{ else }}{{ with .Site.Params.description }}{{ . }}{{ end }}{{ end }}{{ end }}"/>
  {{ if .Site.Params.twitterCardImage }}
    <meta name="twitter:image" content="{{ .Site.Params.twitterCardImage | absURL }}" />
    {{ else }}
    <meta name="twitter:image" content="{{ .Site.BaseURL }}images/avatar.png" />
  {{ end }}
{{ end }}