Add context-aware child-creation shortcuts to nodes#show

parent_match Procs on CccConventions::NODE_KINDS, matched against
unique_path, decide which "add child" kinds show on a given node. Fixes
nodes#new not honoring a pre-selected kind (radio group and parent-field
visibility both defaulted to "generic" unconditionally).

4 files changed, 29 insertions, 10 deletions

diff --git a/app/controllers/nodes_controller.rb b/app/controllers/nodes_controller.rb
index 69aa268..a72be68 100644
--- a/app/controllers/nodes_controller.rb
+++ b/app/controllers/nodes_controller.rb
@@ -22,6 +22,7 @@ class NodesController < ApplicationController
 
   def new
     @node = Node.new node_params
+    @selected_kind = CccConventions::NODE_KINDS.key?(params[:kind]) ? params[:kind] : "generic"
     if params.has_key?(:parent_id)
       @parent_id = params[:parent_id]
       @parent_name = Node.find(@parent_id).title
diff --git a/app/helpers/nodes_helper.rb b/app/helpers/nodes_helper.rb
index 2baf813..a89f879 100644
--- a/app/helpers/nodes_helper.rb
+++ b/app/helpers/nodes_helper.rb
@@ -58,4 +58,9 @@ module NodesHelper
       t(:event_schedule_none)
     end
   end
+
+  def matching_node_kinds(node)
+    path = node.unique_path
+    CccConventions::NODE_KINDS.select { |_, config| config[:parent_match]&.call(path) }
+  end
 end
diff --git a/app/views/nodes/new.html.erb b/app/views/nodes/new.html.erb
index 0a05325..71f2fbf 100644
--- a/app/views/nodes/new.html.erb
+++ b/app/views/nodes/new.html.erb
@@ -13,7 +13,7 @@
   <div class="node_content">
     <% CccConventions::NODE_KINDS.each do |kind, config| %>
       <p>
-        <%= radio_button_tag :kind, kind, kind == "generic",
+        <%= radio_button_tag :kind, kind, kind == @selected_kind,
           data: { path_prefix: resolve_kind_text(config[:path_prefix]) } %>
         <%= resolve_kind_text(config[:label]) %>
         <% if config[:hint] %>
@@ -29,7 +29,7 @@
     <span class="field_hint">A URL slug will be generated from this automatically. You can review or adjust it afterward under the "metadata" section's Slug field.</span>
   </div>
 
-  <div id="parent_search_field">
+  <div id="parent_search_field" style="<%= @selected_kind == "generic" ? "" : "display: none;" %>">
     <div class="node_description">Parent</div>
     <div class="node_content">
       <%= text_field_tag :parent_search_term, @parent_name %>
diff --git a/app/views/nodes/show.html.erb b/app/views/nodes/show.html.erb
index 189adb8..963bc37 100644
--- a/app/views/nodes/show.html.erb
+++ b/app/views/nodes/show.html.erb
@@ -101,17 +101,30 @@
       <%= link_to 'add event', new_event_path(node_id: @node.id, tag_list: mapping&.last, auto_tag_source: mapping&.first, return_to: request.path) %>
     </div>
 
-    <% if @node.children.any? %>
+    <% matches = matching_node_kinds(@node) %>
+    <% if @node.children.any? || matches.any? %>
       <div class="node_description">Children</div>
       <div class="node_content node_info_group">
-        <details>
-          <summary><%= pluralize(@node.children.count, 'child', 'children') %></summary>
-          <ul>
-            <% @node.children.order(:slug).each do |child| %>
-              <li><%= link_to (child.head&.title || child.draft&.title || child.slug), node_path(child) %></li>
+        <% if @node.children.any? %>
+          <details>
+            <summary><%= pluralize(@node.children.count, 'child', 'children') %></summary>
+            <ul>
+              <% @node.children.order(:slug).each do |child| %>
+                <li><%= link_to (child.head&.title || child.draft&.title || child.slug), node_path(child) %></li>
+              <% end %>
+            </ul>
+          </details>
+        <% end %>
+        <% if matches.any? %>
+          <p class="add_child_links">
+            <% matches.each_with_index do |(kind, config), index| %>
+              <%= " &middot; ".html_safe if index > 0 %>
+              <% link_params = { kind: kind } %>
+              <% link_params[:parent_id] = @node.id if kind == "generic" %>
+              <%= link_to "add '#{resolve_kind_text(config[:label])}' child", new_node_path(link_params) %>
             <% end %>
-          </ul>
-        </details>
+          </p>
+        <% end %>
       </div>
     <% end %>