layouts/partials/head-cover.html


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{{ $file := .Params.cover }}
{{ $coverAlt := .Params.coverAlt | default .Site.Params.coverAlt }}


<!-- Image processing configuration -->
{{ $imgProcConfig := partialCached "utilities/image-processing-config" . }}

{{ $resize := $imgProcConfig.autoResize }}


<!-- Default image path -->
{{ $imgPath := .Page.Param "imgPath" }}

{{ if $imgPath }}
  {{ $file = path.Join $imgPath .Params.cover }}
{{ end }}

{{ $inputFile := false }}

{{ if and .Site.Params.cover (not .Params.cover) }}
  {{ $inputFile = resources.Get .Site.Params.cover }}
{{ else }}
  {{ $inputFile = .Page.Resources.GetMatch $file }}
{{ end }}


<!-- Avoid trying to convert unsupported formats (GIF, SVG, etc) -->
{{ $supportedFormats := (slice "jpeg" "png" "tiff") }}


<!-- Initialization -->
{{ $fallbackOptions := false }}

{{ $openGraphImage := false }}
{{ $twitterImage := false }}

{{ $schemaCover := false }}


{{ if and $inputFile $resize }}

  {{ if in $supportedFormats ($inputFile.MediaType.SubType) }}

    <!-- Generate images for Open Graph, Twitter Cards and also Schema -->
    {{ with $inputFile }}

      <!-- Make sure "tiff" is converted to a format with better support -->
      {{ if eq .MediaType.SubType "tiff" }}
        {{ $fallbackOptions = $imgProcConfig.fallbackOptions }}
      {{ end }}

      {{ $openGraphImage = (.Fill (printf "%s %s" $imgProcConfig.openGraphFillOptions $fallbackOptions)) }}
      {{ $twitterImage = (.Fill (printf "%s %s" $imgProcConfig.twitterFillOptions $fallbackOptions)) }}

    {{ end }}
    
    {{ if and (in .Site.Params.mainSections .Section) (not .Params.sitemapExclude) }}
      {{ $schemaCover = (slice ($twitterImage.Permalink) ($openGraphImage.Permalink)) }}
    {{ end }}
    
  {{ end }}
  
{{ else }}

  {{ with $inputFile }}
  
    {{ $openGraphImage = . }}
    {{ $twitterImage = $openGraphImage }}
    
    {{ if and (in $.Site.Params.mainSections $.Section) (not $.Params.sitemapExclude) }}
      {{ $schemaCover = (slice $inputFile.Permalink) }}
    {{ end }}
    
  {{ end }}
  

{{ end }}

{{ return (dict "openGraphImage" $openGraphImage "coverAlt" $coverAlt "twitterImage" $twitterImage "schemaCover" $schemaCover) }}