Use minimum header sizes

exampleSite/content/_index.md

@@ -56,7 +56,7 @@ disable_sections = true
 
 {{< paige/image alt="Landscape" breakpoints=true class="mt-3 object-fit-cover rounded-4 shadow" fetchpriority="high" height="20rem" loading="eager" process="webp" src="https://images.unsplash.com/photo-1490604001847-b712b0c2f967?w=1296" width="100%" >}}
 
-<h1 class="fw-bold text-center" style="margin-top: 2rem">An advanced Hugo theme</h1>
+<h1 class="fw-bold h1 text-center" style="margin-top: 2rem">An advanced Hugo theme</h1>
 
 <div class="container-fluid">
     <div class="justify-content-center row">

layouts/_default/list.atom.xml

@@ -107,7 +107,7 @@
     {{ range $subpage := $subpages }}
         {{ if not (.Param "paige.exclude_feeds") }}
             <entry>
-                {{ $content := partial "paige/func-minify.html" (dict "content" .Content) }}
+                {{ $content := partial "paige/func-content.html" $subpage }}
                 {{ $external := and .Params.link (not (.Param "paige.feeds.disable_link")) | not | not }}
                 {{ $id := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.PublishDate.Format "2006-01-02") .RelPermalink }}
                 {{ $lastmod := .Lastmod.Format $date }}
@@ -117,6 +117,8 @@
 
                 {{ $link := cond $external .Params.link .Permalink }}
 
+                {{ $content = partial "paige/func-minify.html" (dict "content" $content) }}
+
                 {{ if and $content $external }}
                     {{ $text := or (.Param "paige.feeds.page_link" | markdownify) "⏎" }}
 

layouts/_default/list.rss.xml

@@ -97,7 +97,7 @@
                 <item>
                     {{ $author := "" }}
                     {{ $authors := partial "paige/func-authors.html" . }}
-                    {{ $description := partial "paige/func-minify.html" (dict "content" .Content) }}
+                    {{ $description := partial "paige/func-content.html" $subpage }}
                     {{ $external := and .Params.link (not (.Param "paige.feeds.disable_link")) | not | not }}
                     {{ $guid := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.PublishDate.Format "2006-01-02") (cond (.Params.id | not) .RelPermalink .Params.id) }}
                     {{ $published := .PublishDate.Format $date }}
@@ -105,6 +105,8 @@
 
                     {{ $link := cond $external .Params.link .Permalink }}
 
+                    {{ $description = partial "paige/func-minify.html" (dict "content" $description) }}
+
                     {{ with $authors }}
                         {{ $primary := index . 0 }}
 

layouts/partials/paige/func-content.html

@@ -0,0 +1,31 @@
+{{ $page := . }}
+
+{{ $result := $page.Content }}
+
+{{ $matches := findRESubmatch "<h([1-6])[ >]" $result }}
+
+{{ with $matches }}
+    {{ $max := 0 }}
+
+    {{ range . }}
+        {{ $level := index . 1 | int }}
+
+        {{ if gt $level $max }}
+            {{ $max = $level }}
+        {{ end }}
+    {{ end }}
+
+    {{ if and $max (lt $max 6) }}
+        {{ $shift := sub 6 $max }}
+
+        {{ range seq $max | collections.Reverse }}
+            {{ $old := . }}
+            {{ $new := add $old $shift }}
+
+            {{ $result = replaceRE (printf "<h%d([ >])" $old) (printf "<h%d$1" $new) $result }}
+            {{ $result = replaceRE (printf "</h%d>" $old) (printf "</h%d>" $new) $result }}
+        {{ end }}
+    {{ end }}
+{{ end }}
+
+{{ return $result }}

layouts/partials/paige/page.html

@@ -1,7 +1,7 @@
 {{ $page := . }}
 
 {{ $class := slice }}
-{{ $content := $page.Content }}
+{{ $content := partial "paige/func-content.html" $page }}
 {{ $draft := $page.Draft }}
 {{ $expired := and $page.ExpiryDate (lt $page.ExpiryDate now) }}
 {{ $future := and $page.PublishDate (gt $page.PublishDate now) }}