Tasks can be filtered by namespace

app/controllers/maintenance_tasks/application_controller.rb

@@ -11,15 +11,15 @@ class ApplicationController < MaintenanceTasks.parent_controller.constantize
       policy.style_src_elem(
         BULMA_CDN,
         # <style> tag in app/views/layouts/maintenance_tasks/application.html.erb
-        "'sha256-Uhc2rCuqplhR7sM05OaAY3Fv+TFerqLtTOPdVycAIQ4='",
+        "'sha256-jxixiCsEmOniWo0ywDFgxS+LQe+frJrsg1dfPPTJhAA='",
       )
       capybara_lockstep_scripts = [
         "'sha256-1AoN3ZtJC5OvqkMgrYvhZjp4kI8QjJjO7TAyKYiDw+U='",
         "'sha256-QVSzZi6ZsX/cu4h+hIs1iVivG1BxUmJggiEsGDIXBG0='", # with debug on
       ] if defined?(Capybara::Lockstep)
       policy.script_src_elem(
         # <script> tag in app/views/layouts/maintenance_tasks/application.html.erb
-        "'sha256-NiHKryHWudRC2IteTqmY9v1VkaDUA/5jhgXkMTkgo2w='",
+        "'sha256-n0UyWNeUyfUfrkvN/G1LqwSiN8WTlXTbA2BCEPmtKrQ='",
         # <script> tag for capybara-lockstep
         *capybara_lockstep_scripts,
       )

app/controllers/maintenance_tasks/tasks_controller.rb

@@ -12,7 +12,17 @@ class TasksController < ApplicationController
     # Renders the maintenance_tasks/tasks page, displaying
     # available tasks to users, grouped by category.
     def index
-      @available_tasks = TaskDataIndex.available_tasks.group_by(&:category)
+      all_tasks = TaskDataIndex.available_tasks
+      @namespaces = helpers.extract_namespaces(all_tasks)
+      @selected_namespace = params[:namespace]
+
+      filtered_tasks = if @selected_namespace.present?
+        all_tasks.select { |task| task.name.start_with?("#{@selected_namespace}::") }
+      else
+        all_tasks
+      end
+
+      @available_tasks = filtered_tasks.group_by(&:category)
     end
 
     # Renders the page responsible for providing Task actions to users.

app/helpers/maintenance_tasks/tasks_helper.rb

@@ -199,5 +199,55 @@ def attribute_required?(task, parameter_name)
         validator.kind == :presence
       end
     end
+
+    # Extracts unique namespaces from a collection of tasks.
+    #
+    # @param tasks [Array] collection of task objects with a name method.
+    # @return [Array<String>] sorted unique namespaces.
+    def extract_namespaces(tasks)
+      tasks
+        .filter_map { |task| task.name.deconstantize.presence }
+        .uniq
+        .sort
+    end
+
+    # Builds a nested tree structure from a flat list of namespaces.
+    #
+    # @param namespaces [Array<String>] flat list of namespaces.
+    # @return [Hash] nested tree structure.
+    def build_namespace_tree(namespaces)
+      namespaces.each_with_object({}) do |namespace, tree|
+        parts = namespace.split("::")
+        parts.each_with_index.inject(tree) do |current, (part, index)|
+          full_path = parts[0..index].join("::")
+          current[part] ||= { name: part, full_path: full_path, children: {} }
+          current[part][:children]
+        end
+      end
+    end
+
+    # Renders a namespace tree node with nested children using details/summary.
+    #
+    # @param node [Hash] the node to render { name:, full_path:, children: }.
+    # @param selected_namespace [String, nil] the currently selected namespace.
+    # @return [ActiveSupport::SafeBuffer] HTML for the node.
+    def render_namespace_node(node, selected_namespace)
+      is_active = selected_namespace == node[:full_path]
+      is_expanded = is_active || selected_namespace&.start_with?("#{node[:full_path]}::")
+      link = link_to(node[:name], tasks_path(namespace: node[:full_path]), class: class_names("is-active" => is_active))
+
+      content_tag(:li) do
+        if node[:children].present?
+          content_tag(:details, open: is_expanded || nil) do
+            content_tag(:summary) { link } +
+              content_tag(:ul) do
+                safe_join(node[:children].values.sort_by { |n| n[:name] }.map { |child| render_namespace_node(child, selected_namespace) })
+              end
+          end
+        else
+          link
+        end
+      end
+    end
   end
 end

app/views/layouts/maintenance_tasks/_navbar.html.erb

@@ -2,4 +2,19 @@
   <div class="navbar-brand">
     <%= link_to 'Maintenance Tasks', root_path, class: 'navbar-item is-size-4 has-text-weight-semibold has-text-danger' %>
   </div>
+  <% if action_name == "index" %>
+    <div class="navbar-end">
+      <div class="navbar-item">
+        <div class="task-search" data-tasks-path="<%= tasks_path %>">
+          <%= text_field_tag :task_search, nil,
+            id: "task-search-input",
+            class: "input",
+            placeholder: "Search tasks...",
+            autocomplete: "off",
+            aria: { label: "Search tasks", autocomplete: "list", controls: "task-search-results" } %>
+          <div class="task-search-results" id="task-search-results" role="listbox"></div>
+        </div>
+      </div>
+    </div>
+  <% end %>
 </nav>