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# lib/exceptions/backends/yell.rb

require 'exceptions/backend'
require 'exceptions/result'
require 'yell'

module Exceptions
  module Backends
    class YellLogger < ::Exceptions::Backend
      def initialize(log = nil, str = nil)
        @logger = log ||= yeller
        fail unless @logger.kind_of? Yell::Logger
        @str = str ||= "%s\n%s"
      end
      def notify(exception, options = {})
        @logger.fatal sprintf @str, exception.to_s, options.to_a[0].to_s
        YellResult.new
      end
      def rack_exception(exception, env)
        notify(exception, rack_env: env)
      end

      private
      def yeller
        return Object.logger if Object.logger.kind_of? Yell::Logger
        Yell.new :stdout, name: self.class
      end
    end
  end
  class YellResult < ::Exceptions::Result
  end
end

# config.ru

# ...

Yell.new :stdout, name: Object,
  colors: true,
  trace: :fatal,
  format: Yell.format('%d [%5L] %p : %m',
                      '%d.%m.%Y %T.%L %Z')
Object.send :include, Yell::Loggable

use Rack::Exceptions, ::Exceptions::Backends::YellLogger.new

# ...

# config.ru

require 'yell'
use Rack::Exceptions, ::Exceptions::Backends::YellLogger.new

use Rack::Exceptions, Exceptions::Backends::Logger.new

use Rack::Exceptions, backend: :raiser