Hugo-theme-stack/layouts/partials/helper/image.html

{{ $result := dict "exists" false "permalink" nil "resource" nil "isDefault" false }}
{{ $imageField := .Params.image }}
{{ if $imageField }}
    <!-- If page has `image` field set -->
    {{ $result = merge $result (dict "exists" true) }}

    {{ $url := urls.Parse $imageField }}
    {{ if or (eq $url.Scheme "http") (eq $url.Scheme "https") }}
        <!-- Is a external image -->
        {{ $result = merge $result (dict "permalink" $imageField) }}
    {{ else }}
        {{ $pageResourceImage := .Resources.GetMatch (printf "%s" ($imageField | safeURL)) }}
        {{ $siteResourceImage := resources.GetMatch (printf "%s" ($imageField | safeURL)) }}
        
        {{ if $pageResourceImage }}
            <!-- If image is found under page bundle -->
            {{ $result = merge $result (dict "permalink" $pageResourceImage.RelPermalink) }}
            {{ $result = merge $result (dict "resource" $pageResourceImage) }}
        {{ else if $siteResourceImage }}
            <!-- Try search image under site's assets folder -->
            {{ $result = merge $result (dict "permalink" $siteResourceImage.RelPermalink) }}
            {{ $result = merge $result (dict "resource" $siteResourceImage) }}
        {{ else }}
            <!-- Can not find the image -->
            {{ errorf "Failed loading image: %q" $imageField }}
            {{ $result = merge $result (dict "exists" false) }}
        {{ end }}
    {{ end }}

{{ end }}

{{ return $result }}