retry.rb

# -*- coding: utf-8 -*-
class Retry
  def initialize(times, begin_block)
    @times = times
    @begin_block = begin_block
  end
  def catch(error_type, &rescue_block)
    tries = 0
    begin
      @begin_block.call(tries)
    rescue error_type => e
      rescue_block.call(e, tries)
      tries += 1
      retry if tries < @times
    end
  end
end
class Fixnum
  def times_try(&block)
    return Retry.new(self, block)
  end
end
class CustomError < StandardError;end


10.times_try {|i|
  p "#{i}: せーのっ"
  raise CustomError
  p "#{i}: でもそんなーんじゃっだーめっ"
} .catch(CustomError) {|e, i|
  p "#{i}: ...?"
}