require "slim-rails/version"
require "rails"
require "slim"
require "slim-rails/register_engine"

module Slim
  module Rails
    class Railtie < ::Rails::Railtie
      config.app_generators.template_engine :slim

      initializer "slim_rails.configure_template_digestor" do |app|
        Slim::Rails::RegisterEngine.register_engine(app, config)

        ActiveSupport.on_load(:action_view) do
          ActiveSupport.on_load(:after_initialize) do
            if defined?(CacheDigests::DependencyTracker)
              # 'cache_digests' gem being used (overrides Rails 4 implementation)
              CacheDigests::DependencyTracker.register_tracker :slim, CacheDigests::DependencyTracker::ERBTracker

              if ::Rails.env.development?
                # recalculate cache digest keys for each request
                CacheDigests::TemplateDigestor.cache = ActiveSupport::Cache::NullStore.new
              end
            elsif ::Rails.version.to_s >= "4.0"
              # will only apply if Rails 4, which includes 'action_view/dependency_tracker'
              require "action_view/dependency_tracker"
              ActionView::DependencyTracker.register_tracker :slim, ActionView::DependencyTracker::ERBTracker
            end
          rescue
            # likely this version of Rails doesn't support dependency tracking
          end
        end
      end
    end
  end
end