Add support for hooks in layouts/partials/hooks

Supported hooks:

- head_start
- head_end
- body_end
- footer_start

layouts/_default/baseof.html

@@ -32,6 +32,8 @@
   {{ partialCached "math.html" . }}
   {{ end }}
 
+  {{/* Body end hook */}}
+  {{ partial "functions/get_hook.html" (dict "hook" "body_end" "context" .) }}
 </body>
 
 <script src="{{ "js/theme-switch.js" | relURL }}"></script>

layouts/partials/footer.html

@@ -1,5 +1,8 @@
 {{ $showFooter := default true .Site.Params.showFooter }}
 {{ if $showFooter }}
+    {{/* Footer start hook */}}
+    {{ partial "functions/get_hook.html" (dict "hook" "footer_start" "context" .) }}
+
     {{ if not .Site.Params.footerContent }}
     <p>Powered by
         <a href="https://gohugo.io/">Hugo</a>

layouts/partials/functions/get_hook.html

@@ -0,0 +1,23 @@
+{{/* 
+    Customize layouts without overwriting files.
+    Hooks should be defined in the layouts/partials/hooks directory.
+    
+    Parameters:
+    - hook: The name of the hook to be used.
+    - context: The context to be passed to the partial.
+*/}}
+
+{{ $hook := .hook }}
+{{ $context := .context }}
+{{ $hookName := $hook.Name }}
+{{ $hookType := $hook.Type }}
+
+{{ if not (hasSuffix $hook ".html") }}
+    {{ $hook = printf "%s.html" $hook }}
+{{ end }}
+
+{{ $hook_path := path.Join "layouts/partials/hooks" $hook }}
+
+{{ if fileExists $hook_path }}
+    {{ partial $hook_path $context }}
+{{ end }}

layouts/partials/head.html

@@ -1,6 +1,9 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width">
 
+{{/* Head start hook */}}
+{{ partial "functions/get_hook.html" (dict "hook" "head_start" "context" .) }}
+
 {{ $faviconPath := (.Site.Params.faviconPath | default "" | absURL) }}
 
 <link rel="icon" type="image/ico" href="{{ $faviconPath }}/favicon.ico">
@@ -46,3 +49,5 @@
 {{ end }}
 {{ end }}
 
+{{/* Head end hook */}}
+{{ partial "functions/get_hook.html" (dict "hook" "head_end" "context" .) }}