Question

继续下面的链接中的stackoverflow问题：

ruby match string or space/tab at the beginning of a line and insert uniq lines to a file

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我有这些文件 - ./files_tmp/60416.log：

AAAAAA555
AAAAAA555
BBBBBB
CCCCC
  AAAAAA434343
  AAAAAA434343

./files_tmp/60417.log

AAAAAA55544
AAAAAA55544
BBBBBB
CCCCC
  AAAAAA434343
  AAAAAA434343

我有这段代码：

files = Dir["./files_tmp/*.log"]
files.each do |file_name|
  puts file_name if !File.directory? file_name
     Tempfile.open do |temp|
      File.open(file_name) do |input|
        input.each_line do |line|
          if line.match(/AAAAAA/) || (line.match(/^\t/) and tabs)
          puts "found a line #{line}"
            temp.write(line.lstrip!)
              end
            end
          end
      File.open("./temp.log", "a") do |file|
        temp.rewind
        file.write(temp.readlines.uniq.join(""))
      end
    end
end

puts "found a line #{line}"的结果如下，但我预计会打印仅行AAAAAA

＆＃13;

./files_tmp/60416.log
found a line AAAAAA555
found a line AAAAAA555
found a line BBBBBB
found a line CCCCC
found a line   AAAAAA434343
found a line   AAAAAA434343
./files_tmp/60417.log
found a line AAAAAA55544
found a line AAAAAA55544
found a line BBBBBB
found a line CCCCC
found a line   AAAAAA434343
found a line   AAAAAA434343

＆＃13;

我可以在临时文件./temp.log中看到重复的行，而不是所有行AAAAAA

＆＃13;

    AAAAAA434343
    AAAAAA434343

＆＃13;

我期望：

＆＃13;

AAAAAA555
AAAAAA434343
AAAAAA55544

＆＃13;

我想知道为什么？

我使用file.write(temp.readlines.uniq.join(""))代替file.write(temp.readlines.uniq)，因为结果将是：

["AAAAAA434343\n"]
了解rewind目的是什么，它有什么用呢？

感谢您的帮助！

Answer 1

您不需要弄乱Tempfile。只需收集您想要的内容，然后将所有内容写入目标文件：

result = Dir["./files_tmp/*.log"].each_with_object([]) do |file_name, lines|
  next if File.directory? file_name # skip dirs

  File.readlines(file_name) do |line|
    next unless line =~ /AAAAAA/

    puts "found a line #{line}"
    lines |= [line.lstrip!] # append if and only it’s uniq
  end
end

File.write("./temp.log", result.join($/)) # join with OS-aware line sep

Ruby Tempfile - 行匹配并删除重复行

1 个答案: