feat: add support for Book-based homepage

Enables the Book layout to be used directly at the root of the site.

assets/scss/academic/_docs.scss

@@ -108,6 +108,7 @@
 }
 
 .docs-sidebar .docs-toc-item.active a,
+.docs-sidebar .docs-toc-item a.active, // Book layout sidebar links
 .docs-sidebar .nav>.active:hover>a,
 .docs-sidebar .nav>.active>a {
   font-weight: bold;

layouts/index.html

@@ -15,6 +15,10 @@
 {{ end }}
 
 {{/* Generate homepage. */}}
-{{ partial "widget_page.html" . }}
+{{ if eq .Type "book" }}
+  {{ partial "book_layout.html" . }}
+{{ else }}
+  {{ partial "widget_page.html" . }}
+{{ end }}
 
 {{- end -}}

layouts/partials/book_menu.html

@@ -2,12 +2,15 @@
 
 {{- $first := false -}}
 {{- $current_node := .current_node -}}
+{{- $is_root := .is_root -}}
 {{- $order_by := .order_by -}}
 {{ $icon := "" }}
 
 {{ with .sect }}
   {{ if .IsSection}}
-    {{- $first = eq $current_node.FirstSection . -}}
+    {{ if not $is_root }}
+      {{- $first = eq $current_node.FirstSection . -}}
+    {{ end }}
 
     {{- safeHTML $current_node.FirstSection.Params.pre_nav -}}
 

layouts/partials/book_sidebar.html

@@ -10,19 +10,35 @@
 
 <nav class="collapse docs-links" id="docs-nav">
   {{ $current_node := . }}
-  {{ $menu_name := (path.Base (path.Split .FirstSection).Dir) }}
+  {{ $menu_name := "" }}
   {{ $order_by := cond (eq $menu_name "updates") "title_desc" site.Params.books.order_by }}
-
   {{ $query := "" }}
-  {{- if eq $order_by "title" -}}
-    {{- $query = where .Site.Home.Sections.ByTitle "Section" $menu_name -}}
-  {{- else if eq $order_by "title_desc" -}}
-    {{- $query = where .Site.Home.Sections.ByTitle.Reverse "Section" $menu_name -}}
-  {{- else -}}
-    {{- $query = where .Site.Home.Sections.ByWeight "Section" $menu_name -}}
-  {{- end}}
+  {{ $root_page := .GetPage "/_index.md" }}
+  {{ $is_root := false}}
+  {{ if $root_page | and (eq $root_page.Type "book") }}
+    {{ $is_root = true}}
+    <ul class="nav docs-sidenav">
+      <li class="{{ if .IsHome }}active{{ end }}"><a href="{{ $root_page.RelPermalink }}">{{$root_page.Title}}</a></li>
+    </ul>
+    {{- if eq $order_by "title" -}}
+      {{- $query = .Site.Home.Sections.ByTitle  -}}
+    {{- else if eq $order_by "title_desc" -}}
+      {{- $query = .Site.Home.Sections.ByTitle.Reverse  -}}
+    {{- else -}}
+      {{- $query = .Site.Home.Sections.ByWeight -}}
+    {{- end}}
+  {{else}}
+    {{ $menu_name = (path.Base (path.Split .FirstSection).Dir) }}
+    {{- if eq $order_by "title" -}}
+      {{- $query = where .Site.Home.Sections.ByTitle "Section" $menu_name -}}
+    {{- else if eq $order_by "title_desc" -}}
+      {{- $query = where .Site.Home.Sections.ByTitle.Reverse "Section" $menu_name -}}
+    {{- else -}}
+      {{- $query = where .Site.Home.Sections.ByWeight "Section" $menu_name -}}
+    {{- end}}
+  {{end}}
 
   {{- range $query -}}
-    {{ template "book-menu" dict "sect" . "current_node" $current_node "order_by" $order_by }}
+    {{ template "book-menu" dict "sect" . "current_node" $current_node "order_by" $order_by "is_root" $is_root }}
   {{- end -}}
 </nav>