为什么Ruby中的Dir.glob在带有方括号的文件夹中看不到文件? [英] Why Dir.glob in Ruby doesn't see files in folders named with square brackets?

问题描述

我有这棵树:

.
├── folders
│   ├── foo
│   │   └── fuu.flac
│   ├── foo [bar]
│   │   └── fuu.flac
│   └── foo[bar]
│       └── fuu.flac
└── test.rb

和此代码:

#!/bin/env ruby
## encoding: utf-8

Dir.glob('./folders/*').each do |path|
  puts "Contents of #{path} :"
  Dir.glob(File.join(path, '*')).each do |file_path|
    puts "\t #{file_path}"
  end
end

我希望看到我的三个fuu.flac文件.但是，该脚本不会显示名称中带有方括号的文件夹中的文件.

I expect to see my three fuu.flac files. However the script doesn't show the files in the folders with square brackets in the name.

以下是输出:

Contents of ./folders/foo [bar] :
Contents of ./folders/foo[bar] :
Contents of ./folders/foo :
     ./folders/foo/fuu.flac

这是Ruby的正常行为，还是我想念什么?

Is this a normal beahvior of Ruby, or did I miss something ?

(我正在Ubuntu 12.10下使用Ruby 1.9.3)

(I am using Ruby 1.9.3 under Ubuntu 12.10)

推荐答案

方括号带有特殊含义 在shell globbing 的上下文中. foo [bar] 匹配 foob ， fooa 或 foor ，但显然不匹配 foo [bar] .如果您确实想动态生成这种模式，则至少需要使用反斜杠转义 \?{} [].字符:

The square brackets have a special meaning in the context of shell globbing. foo[bar] matches foob, fooa or foor, but obviously not foo[bar]. If you really want to dynamically generate such a pattern, you will need to at least escape the characters \?{}[]. using a backslash:

def escape_glob(s)
  s.gsub(/[\\\{\}\[\]\*\?]/) { |x| "\\"+x }
end

# ...
Dir.glob("#{escape_glob(path)}/*").each do |file_path|
  # ...
end

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