Ruby使用:: expand_path创建并打开文件,并使用:: expand_path创建目录

时间:2013-05-11 04:15:20

标签: ruby file io directory

我刚刚开始用Ruby学习文件IO,并且有一个问题是能够使用:: expand_path指向与我的程序运行位置不同的路径。

这是我基本上喜欢能够做到的事情,但遗憾的是这对我不起作用。

require 'openuri'
require 'fileutils'

if File.expand_path.exists?("~/newpathdir/")
        File.expand_path.open("~/newpathdir/log.txt", "a+") {|f| f.write("#{Time.now}       Directory is good.  Returning...") }        #If directory is present, does nothing
        return
    else
        FileUtils.mkdir_p.expand_path("~/newpathdir/")
        File.open("~/newpathdir/log.txt", "a+") {|f| f.write("#{Time.now}       Directory not found.  Creating...") }       #If directory not found, writes to log
    end

def writeLatestToFile
    tweet_file = File.open("~/newpathdir/latest_tweet.txt", "a+")       #Opens file
        if tweet_file       #Checks if file opened correctly
            tweet_file.syswrite("#{@latest_tweet["ID"]}\n#{@latest_tweet["Tweet"]}")        #Appends latest_command information to latest_command.txt
        elsif
            File.open("~/newpathdir/log.txt", 'a+') {|f| f.write("#{Time.now}       Error opening tweet_file.txt") }        #If error in opening file, writes to log
        end
end

非常感谢任何帮助。

1 个答案:

答案 0 :(得分:1)

这是你想要的吗?

require 'fileutils'

def append(path, message)
  path = File.expand_path path
  FileUtils.mkdir_p File.dirname(path)
  File.open(path, "a+") {|f| f.write "#{message}\n" }
end

def log(path, message)
  append(path, "#{Time.now} #{message}")
end

append('~/newpathdir/latest_tweet', "123456\nLatestTweet")
log('~/newpathdir/log', 'Hello world')

也许你也应该试试LoggerClass: Logger (Ruby 1.9.3)

require 'logger'
require 'fileutils'

path = File.expand_path '~/newnewpathdir/tweets_logger.log'
FileUtils.mkdir_p File.dirname(path)
log = Logger.new(path)

log.debug('Hello world.')
log.info('Info message.')
log.error('Error message.')