_rails_template_logger.rb

# config/initializers/local/template_logger.rb

def magenta text
  "\e[35m#{text}\e[0m"
end

ActiveSupport::Notifications.subscribe(/render/) do |*args|
  event = ActiveSupport::Notifications::Event.new(*args)
  tpl = event.payload[:identifier].sub Rails.root.to_s, '.'
  Thread.current[:local_templates][tpl] ||= -1
  Thread.current[:local_templates][tpl] += 1
end

ActiveSupport::Notifications.subscribe("start_processing.action_controller") do |*args|
  Thread.current[:local_controller] = "#{args[4][:controller]}##{args[4][:action]}"
  Thread.current[:local_templates] = {}
end

ActiveSupport::Notifications.subscribe("process_action.action_controller") do
  puts magenta "Templates in use for #{Thread.current[:local_controller]}"
  Thread.current[:local_templates].keys.sort
    .each do
      cnt = Thread.current[:local_templates][_1]
      name = " #{_1}"
      name += " (#{cnt})" if cnt > 1
      name = magenta(name) unless name.include?('kaminari') || name.include?('layouts')
      puts name
    end
end

output.log

# example output in clonosle

Templates in use for OrdersController#new
 ./app/views/individuals/_modal.html.erb
 ./app/views/kaminari/_gap.html.erb
 ./app/views/kaminari/_last_page.html.erb
 ./app/views/kaminari/_next_page.html.erb
 ./app/views/kaminari/_page.html.erb (9)
 ./app/views/kaminari/_paginator.html.erb
 ./app/views/kaminari/_per_page.html.erb
 ./app/views/layouts/_account_nav.html.erb
 ./app/views/layouts/_flash_notice.html.erb
 ./app/views/layouts/_main_offcanvas.html.erb
 ./app/views/layouts/_nav_item.erb (33)
 ./app/views/layouts/_top_action.html.erb
 ./app/views/layouts/_top_nav.html.erb
 ./app/views/layouts/application.html.erb
 ./app/views/orders/_player_view.html.erb
 ./app/views/orders/new.html.erb