如何格式化红宝石记录器？

Question

你如何格式化红宝石记录器？

Answer 1

logger = Logger.new('nice.log') 

logger.formatter = proc do |severity, datetime, progname, msg| 
    "NICE: #{msg}\n" 
end 

logger.info("I like cheese.") 

# nice.log: 
NICE: I like cheese. 

Answer 2

如果你想只有时间格式，可以方便的与datetime_format和标准format specification做到这一点。 例如，如果你这样做：

# Set the logger: 
logger = Logger.new($stdout) 
logger.level = Logger::DEBUG 
logger.datetime_format = "%Y-%m-%d %H:%M:%S" 

logger.info("This is an info log...") 
logger.error("This is an error log...") 

你最终将原木，如：

I, [2015-01-20 14:02:29#17329] INFO -- myProg: This is an info log... 
E, [2015-01-20 14:02:29#17329] ERROR -- myProg: This is an error log... 

相反，如果你想完全自主的日志，你可以使用logger.formatter。 例如，如果你这样做：

# Set the logger: 
logger = Logger.new($stdout) 
logger.level = Logger::DEBUG 
logger.formatter = proc do |severity, datetime, progname, msg| 
    date_format = datetime.strftime("%Y-%m-%d %H:%M:%S") 
    if severity == "INFO" or severity == "WARN" 
     "[#{date_format}] #{severity} (#{progname}): #{msg}\n" 
    else   
     "[#{date_format}] #{severity} (#{progname}): #{msg}\n" 
    end 
end 

logger.info("This is an info log...") 
logger.error("This is an error log...") 

你最终将原木，如：

[2015-01-20 14:48:04] INFO (myProg): This is an info log... 
[2015-01-20 14:48:04] ERROR (myProg): This is an error log...