ar_migration_log.rb

def block_helper begin_msg, ensure_msg
  start = Time.now
  puts begin_msg.call(start)
  begin
    yield
  rescue Exception => err
    abort err.to_s
  ensure
    puts ensure_msg.call(start)
  end
end

def migration name
  begin_msg = -> start {"== #{start.strftime "%Y%m%d%H%M%S"} #{name} ".ljust(79, "=")}
  ensure_msg = -> start {"== #{start.strftime "%Y%m%d%H%M%S"} #{name} (#{Time.now.minus_with_coercion(start).round(4)}s) ".ljust(79, "=")}
  block_helper(begin_msg, ensure_msg) {yield}
end

def stage action, name
  begin_msg = -> start {"-- #{action}(:#{name})"}
  ensure_msg = -> start {"   -> #{Time.now.minus_with_coercion(start).round(4)}s"}
  block_helper(begin_msg, ensure_msg) {yield}
end