easy-going-rails/lib/semantic/dev_loader.rb

module Semantic
  # use the Zeitwerk autoloader to reattach_appender for development autoreloading feature
  class DevLoader
    def initialize
      @subscribers = []
      force_preload_module
      Rails.autoloaders.main.on_load('ApplicationController') do
        append_ansi_formatter
        register_log_subscriber
      end
      append_ansi_formatter

      # FIXME: when final
      # Rails.logger.level = :error
    end

    private

    def force_preload_module
      self.class.module_parent.constants.each do |const|
        self.class.module_parent.const_get(const)
      end
    end

    def append_ansi_formatter
      SemanticLogger.clear_appenders!
      formatter = Semantic::AnsiFormatter.new
      SemanticLogger.add_appender(io: $stdout,
                                  formatter:,
                                  filter: ->(log) { !formatter.reject(log) })
    end

    def register_log_subscriber
      @subscribers.each { |sub| ActiveSupport::Notifications.unsubscribe(sub) }
      @subscribers.clear

      log_subscriber = Semantic::LogSubscriber.new('toto1')
      @subscribers << ActiveSupport::Notifications.subscribe('start_processing.action_controller') do |event|
        log_subscriber.start_processing(event)
      end
      @subscribers << ActiveSupport::Notifications.subscribe('process_action.action_controller') do |event|
        log_subscriber.finish_processing(event)
      end
    end
  end
end