What's the Ruby equivalent of Python's os.walk?

Question

Does anyone know if there's an existing module/function inside Ruby to traverse file system directories and files? I'm looking for something similar to Python's os.walk. The closest module I've found is Find but requires some extra work to do the traversal.

The Python code looks like the following:

for root, dirs, files in os.walk('.'):
    for name in files:
        print name
    for name in dirs:
        print name

score 27 · Accepted Answer · answered Aug 15 '09 at 03:51

27

The following will print all files recursively. Then you can use File.directory? to see if the it is a directory or a file.

Dir['**/*'].each { |f| print f }

answered Aug 15 '09 at 03:51

ACoolie

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Instead of `Dir[foo].each { bar }`, you can use `Dir.glob(foo) { bar }` which will iterate over all the files matching the block without creating a temporary array first. – sepp2k Aug 15 '09 at 11:34
Is `Dir.foreach('.') { |f| print f } ` the same? It looks more expressive than the [] version. – Thierry Lam Aug 15 '09 at 13:49
2

@Thierry: No. Dir.foreach does not enter subdirectories. – sepp2k Aug 15 '09 at 14:01
I like the glob, you can cherry pick the files you want – Thierry Lam Aug 15 '09 at 14:22

score 11 · Answer 2 · edited Jul 17 '13 at 14:15

11

Find seems pretty simple to me:

require "find"
Find.find('mydir'){|f| puts f}

edited Jul 17 '13 at 14:15

webwurst

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answered Aug 15 '09 at 05:17

Ken Liu

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And where is `Find` defined? `require "find"` Here is the docs: http://www.ruby-doc.org/stdlib-1.9.3/libdoc/find/rdoc/Find.html – Sukima May 01 '13 at 16:49

score 5 · Answer 3 · answered Aug 15 '09 at 19:50

require 'pathname'

def os_walk(dir)
  root = Pathname(dir)
  files, dirs = [], []
  Pathname(root).find do |path|
    unless path == root
      dirs << path if path.directory?
      files << path if path.file?
    end
  end
  [root, files, dirs]
end

root, files, dirs = os_walk('.')

What's the Ruby equivalent of Python's os.walk?

3 Answers3

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