refactor templates layout

@see https://gohugo.io/templates/new-templatesystem-overview/

layouts/_partials/single/main-header/authors.html

@@ -0,0 +1,25 @@
+{{- /*
+    Renders the authors for an item.
+
+    @params authors  The item's author(s).
+    @params sc  The site context.
+*/ -}}
+
+<span style="display: none">
+<p>Author{{ with .authors }}s{{ end }}:&nbsp;
+{{- with .authors -}}
+    </p>
+    <ul>
+    {{- range . -}}
+        {{- if ( eq . $.site_author.name ) -}}
+            <li><p><a class="p-author" itemprop="author" rel="author" href="{{ $.sc.Site.Home.Permalink }}">{{ $.sc.Site.Params.Author.name }}</a></p></li>
+        {{- else -}}
+            <li><p class="p-author" itemprop="author">{{- . -}}</p></li>
+        {{- end -}}
+    {{- end -}}
+    </ul>
+{{- else -}}
+    <a class="p-author" itemprop="author" rel="author" href="{{ $.sc.Site.Home.Permalink }}">{{ $.sc.Site.Params.Author.name }}</a>
+    </p>
+{{- end -}}
+</span>

layouts/_partials/single/main-header/dates.html

@@ -0,0 +1,58 @@
+{{- /*
+  Displays dates for an item.
+
+  @params publishDate  The date an item was published.
+  @params lastmodDate The date an item was last modified.
+  */
+-}}
+
+{{ $publishDate := .publishDate }}
+{{ $lastmodDate := .lastmodDate }}
+
+
+<p class="article-header__publish-date">
+  Published:
+  <time
+    class="dt-published"
+    datetime="{{ $publishDate | time.Format "2006-01-02T15:04:05-07:00" }}"
+    itemprop="datePublished"
+    >{{- $publishDate.Format "January 2" -}}<sup
+      >{{- if in (slice 1 21 31) $publishDate.Day -}}
+        st
+      {{- else if in (slice 2 22) $publishDate.Day -}}
+        nd
+      {{- else if in (slice 3 23) $publishDate.Day -}}
+        rd
+      {{- else -}}
+        th
+      {{- end -}} </sup
+    >, 1{{- $publishDate.Format "2006" | lang.FormatNumberCustom 0 }}&nbsp;<abbr
+      style="font-variant: small-caps; font-size: 0.8em;"
+      title="Holocene Era"
+      >HE</abbr
+    ></time
+  >
+</p>
+
+<p class="article-header__modified-date">
+  Last modified:
+  <time
+    class="dt-updated"
+    datetime="{{ $lastmodDate | time.Format "2006-01-02T15:04:05-07:00" }}"
+    itemprop="dateModified"
+    >{{- $lastmodDate.Format "January 2" -}}<sup>{{- if in (slice 1 21 31)  $lastmodDate.Day -}}
+      st
+    {{- else if in (slice 2 22)  $lastmodDate.Day -}}
+      nd
+    {{- else if in (slice 3 23)  $lastmodDate.Day -}}
+      rd
+    {{- else -}}
+      th
+    {{- end -}}</sup>,
+    1{{- $lastmodDate.Format "2006" | lang.FormatNumberCustom 0 }}&nbsp;<abbr
+      style="font-variant: small-caps; font-size: 0.8em;"
+      title="Holocene Era"
+      >HE</abbr
+    ></time
+  >
+</p>

layouts/_partials/single/main-header/item-tile.html

@@ -0,0 +1,67 @@
+{{- /*
+  Renders the header tile for an item.
+
+  @params pc  The page context.
+  @params sc  The site context.
+  */
+-}}
+
+{{- if ( not ( isset . "sc" ) ) -}}
+  {{- errorf "No site context received" -}}
+{{- end -}}
+
+{{- if ( not ( isset . "pc" ) ) -}}
+  {{- errorf "No page context received (%q)" .sc.Page.File.Dir -}}
+{{- end -}}
+
+{{ with .pc.Params.featured_image }}
+  <img
+    class="u-photo"
+    style="display: none;"
+    src="
+    {{- with ( $.pc.Resources.GetMatch . ) -}}
+      {{- partialCached "images/get-image.html" ( dict "img" . ) .Title -}}
+    {{- else -}}
+      {{- . -}}
+    {{- end -}}
+    "
+    itemprop="image"
+    {{- with ( $.pc.Resources.GetMatch . ) -}}
+      alt="{{ .Params.alt }}"
+    {{- end -}}
+  />
+{{ end }}
+
+
+<div
+  class="article-header__featured-image"
+  {{ with .pc.Params.featured_image }}
+    {{ with ( $.pc.Resources.GetMatch . ) }}
+      style="background-image: url({{- partialCached "images/get-image.html" ( dict "img" . ) .Title -}})"
+    {{ else }}
+      {{- if $.pc.Page.Resources -}}
+        {{- errorf "No Page Resource found for src '%q' (%q).\n\n\tAvailable Page Resources are:\n\t\t%v" . $.pc.Page.File.Path $.pc.Page.Resources -}}
+      {{- else -}}
+        {{- warnf "No Page Resource found for src '%q' (%q)." . $.pc.Page.File.Path -}}
+      {{- end -}}
+      style="background-image: url({{ . }})"
+    {{ end }}
+  {{ end -}}
+>
+  <div class="article-header__title-wrapper">
+    <a
+      class="u-url u-uid"
+      style="display: none"
+      href="{{ .pc.Permalink }}"
+    ></a>
+    {{- with .pc.File -}}
+      {{- partial "text/item-title.html" ( dict "pc" $.pc "sc" $.sc "class" "article-header" ) -}}
+    {{- else -}}
+      {{- partial "text/item-title.html" ( dict "pc" $.pc "sc" $.sc "class" "article-header" ) -}}
+    {{- end -}}
+  </div>
+
+  {{ with ( .pc.Resources.GetMatch .pc.Params.featured_image ) }}
+    {{- partial "media/attr.html" ( dict "pc" $.pc "sc" $.sc "params" .Params ) -}}
+  {{ end }}
+</div>

layouts/_partials/single/main-header/notes.html

@@ -0,0 +1,16 @@
+{{- /*
+  Renders the notes for an item.
+
+  @params note  The notes for an item.
+  @params sc  Site context.
+  */
+-}}
+
+
+<aside class="article-header__notes">
+  <ul>
+    {{ range .notes }}
+      <li>{{ . | $.sc.RenderString | safeHTML }}</li>
+    {{ end }}
+  </ul>
+</aside>

layouts/_partials/single/main-header/series.html

@@ -0,0 +1,18 @@
+{{- /*
+  Renders the series of an item.
+
+  @params series    A list of series' for the item.
+  */
+-}}
+
+
+<p class="article-header__series">
+  Part of series:
+  {{ range .series }}
+    <a
+      class="u-url"
+      href="{{ .RelPermalink }}"
+      >{{ .LinkTitle }}</a
+    >
+  {{ end }}
+</p>

layouts/_partials/single/main-header/toc.html

@@ -0,0 +1,34 @@
+{{- /*
+  Renders appendices and corrigenda for an item.
+
+  @params toc  The page ToC.
+  @params appendices    The item's appendices. Optional.
+  @params fileDir   The file folder name.
+  */
+-}}
+
+{{ $empty_toc_html := "<nav id=\"TableOfContents\"></nav>" }}
+
+{{ if and ( .toc ) ( ne .toc $empty_toc_html ) }}
+  <nav class="article-header__table-of-contents">
+    <h3 class="article-header__subtitle">Table of Contents</h3>
+    {{ .toc }}
+    {{- if fileExists ( path.Join .fileDir "appendices.md" ) -}}
+      <ul class="toc-list--appendices">
+        <li>
+          <a href="#appendices">Appendices</a>
+          <ol>
+            {{ range .appendices }}
+              <li><a href="#{{ . | anchorize }}">{{ . | safeHTML }}</a></li>
+            {{ end }}
+          </ol>
+        </li>
+      </ul>
+    {{- end -}}
+    {{- if fileExists ( path.Join .fileDir "corrigenda.md" ) -}}
+      <ul class="toc-list--corrigenda">
+        <li><a href="#corrigenda">Corrigenda</a></li>
+      </ul>
+    {{- end -}}
+  </nav>
+{{ end }}

layouts/_partials/single/main-header/warnings.html

@@ -0,0 +1,33 @@
+{{- /*
+  Renders the automatic warnings for an item.
+
+  @params pc  The page context.
+  */
+-}}
+
+{{ $post_age_in_years := math.Round ( div ( div ( now.Sub .pc.PublishDate ).Hours 24 ) 365 ) }}
+
+{{ if ( or .pc.Params.site .pc.Params.controversial ( gt $post_age_in_years 2 ) ) }}
+  <aside class="article-header__warnings">
+    <ul>
+      {{ if ( gt $post_age_in_years  2 ) }}
+        <li>
+          This piece was written <strong>over {{ $post_age_in_years }} years ago</strong>. It may no longer accurately reflect my views now,
+          or may be factually outdated.
+        </li>
+      {{ end }}
+      {{ if .pc.Params.controversial }}
+        <li>
+          This piece has been marked as potentially <strong>controversial</strong>, whether due to the topic addressed, the content of the
+          article, or both. Don't say you weren't warned.
+        </li>
+      {{ end }}
+      {{ if .pc.Params.site }}
+        <li>
+          This piece was originally written for an older version of this site. As such, it may not have transferred over properly and some
+          images and links might be broken.
+        </li>
+      {{ end }}
+    </ul>
+  </aside>
+{{ end }}

layouts/_partials/single/main-header/word-count.html

@@ -0,0 +1,9 @@
+{{- /*
+  Displays the length of an item.
+
+  @params wordCount   The wordcount of an item.
+  */
+-}}
+
+
+<p class="article-header__word-count">~<span itemprop="wordCount">{{ .wordCount | lang.FormatNumberCustom 0 }}</span> words</p>