From: Urabe Shyouhei <shyouhei@...>
Date: 2008-12-17T00:26:43+09:00
Subject: Re: implementing python's os.walk

Brad Volz wrote:
> Hello,
> 
> I seem to be having some difficulty creating a version of python's
> os.walk() for ruby, and I was hoping for some pointers.

You should really know how to use Ruby's stdlib named "find".
http://www.ruby-doc.org/stdlib/libdoc/find/rdoc/index.html

Below is another twisted example in Ruby 1.9. It can be used much like python's
generators:

irb(main):060:0> for root, dirs, files in os_walk("/dev/disk") do
irb(main):061:1*   puts root
irb(main):062:1> end



require 'find'
require 'pathname'

def os_walk(dir)
  ret = Fiber.new do
    Pathname(dir).find do |ent|
      next unless ent.directory?
      dirs, files = ent.children.partition {|i| i.directory? }
      Fiber.yield ent, dirs, files
    end
    raise
  end
  def ret.each
    loop { yield resume } rescue self
  end
  ret
end