{{- $isPost := eq .Section "post" -}}
{{- $perm := .Permalink -}}
{{- $base := .Site.BaseURL -}}
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="color-scheme" content="dark light">
<link rel="canonical" href="{{ $perm }}">
<link rel="me" title="Mastodon" href="{{ .Site.Author.mastodonlink }}" />
<link rel="me" title="Github" href="{{ .Site.Author.githublink }}" />
<link rel="author" href="{{ $base }}humans.txt" type="text/plain" />
<!-- generate a thumbnail -->
{{- $logo := "img/bblogo.png" -}}
{{- $thumb := $logo | absURL -}}
{{- $match := findRE `!\[(.*)\]\((.+).(jpg|png|gif)` .RawContent 1 -}}
{{- range $match -}}
  {{- $relthumb := replaceRE `!\[(.*)\]\(` "" . -}}
  {{- if hasPrefix $relthumb "/" -}}
    {{- $thumb = printf "%s%s" $base $relthumb -}}
  {{- else -}}
    {{- $thumb = printf "%s%s" $perm $relthumb -}}
  {{- end -}}
{{- end -}}

<!-- determine description -->
{{- $description := printf "%s | %s" .Site.Title .Site.Params.description -}}
{{- if .Params.subtitle -}}
  {{- $description = .Params.subtitle -}}
{{- else if .Summary -}}
  {{- $description = .Summary | safeHTML | truncate 100 -}}
{{- end -}}

<!-- meta data tags, open graph -->
<meta property="og:site_name" content="{{ .Site.Title }}">
<meta property="og:title" content="{{ .Title }}">
<meta name="description" property="og:description" content="{{ $description }}">
<meta property="og:url" content="{{ $perm }}" />
<meta property="og:type" content="{{ if $isPost }}article{{ else }}website{{ end }}" />
<meta property="og:image" content="{{ $thumb }}" />
<meta property="article:published_time" content="{{ .PublishDate }}" />
<meta property="article:modified_time" content="{{ .Date }}" />
<meta property="article:section" content="{{ .Section }}" />
{{ with .Params.tags }}
  <meta name="keywords" content="{{ delimit . ", " }}">
  {{ range . }}
    <meta property="article:tag" content="{{ . }}" />
  {{- end -}}
{{- end -}}
<!-- end og -->

<!-- structured data -->
{{- $ISO8601 := "2006-01-02T15:04:05-07:00" -}}
<script type="application/ld+json">
{
    "@context" : "https://schema.org",
    "@type" : "BlogPosting",
    "mainEntityOfPage": {
         "@type": "WebPage",
         "@id": {{ $base }}
    },
    "articleSection" : "{{ .Section }}",
    "name" : {{ .Title }},
    "description" : {{ $description }},
    "inLanguage" : "en-US",
    "isFamilyFriendly": "true",
  	"image": {{ $thumb }},
    "author" : {
    	"@type": "Person",
    	"name": "{{ .Site.Author.name }}"
	  },
    "creator" : {
        "@type": "Person",
        "name": "{{ .Site.Author.name }}"
    },    
    "publisher": {
    	"@type": "Organization",
    	"name": "{{ .Site.Title }}",
      "url": {{ $base }},
    	"logo": {
    		"@type": "ImageObject",
    		"url": {{ $logo | absURL }},
        "width":"32",
        "height":"32"   
    	}
	  },
    "accountablePerson" : "{{ .Site.Author.name }}",
    "copyrightHolder" : "{{ .Site.Title }}",
    "copyrightYear" : "{{ .Date.Format "2006" }}",
    "dateCreated": {{ .Date.Format $ISO8601 }},
    "datePublished": {{ .PublishDate.Format $ISO8601 }},
    "dateModified": {{ .Lastmod.Format $ISO8601 }},
    "url" : {{ $perm }},
    "wordCount" : "{{ .WordCount }}",
    "keywords" : [ {{ if isset .Params "tags" }}{{ range .Params.tags }}{{ . }},{{ end }}{{ end }}{{ .Title }}, {{ .Section }} ]
}
</script>