From https://once.com/writebook

app/helpers/leaves_helper.rb

@@ -0,0 +1,29 @@
+module LeavesHelper
+  def leaf_item_tag(leaf, **, &)
+    tag.li class: "arrangement__item toc__leaf toc__leaf--#{leaf.leafable_name}",
+      id: dom_id(leaf),
+      data: {
+        id: leaf.id,
+        arrangement_target: "item"
+      }, **, &
+  end
+
+  def leaf_nav_tag(leaf, **, &)
+    tag.nav data: {
+      controller: "reading-tracker",
+      reading_tracker_book_id_value: leaf.book_id,
+      reading_tracker_leaf_id_value: leaf.id
+    }, **, &
+  end
+
+  def leafable_edit_form(leafable, **, &)
+    form_with model: leafable, url: leafable_path(leafable.leaf), method: :put, format: :html,
+    data: {
+      controller: "autosave",
+      action: "autosave#submit:prevent input@document->autosave#change house-md:change->autosave#change",
+      autosave_clean_class: "clean",
+      autosave_dirty_class: "dirty",
+      autosave_saving_class: "saving"
+    }, **, &
+  end
+end