From: ara.t.howard@...
Date: 2006-10-17T12:53:36+09:00
Subject: Re: Test if Directory is Empty

On Tue, 17 Oct 2006, John Turner wrote:


not sure what you mean there - that's the correct usage... read the ri for
catch.

> Also, won't the "Dir.glob("#{ d }/.*")" return [".", ".."] (well, pass "."
> to the block) and break this?
>
> How about:
>
> def isEmpty?(dir)
>  Dir.glob("#{dir}/*", File::FNM_DOTMATCH) do |f|
>    return false unless f =~ /\.\.?/
>  end
>  return true
> end

yes.  that's definitely better...

that regex is deadly though:

   harp:~ > irb
   irb(main):001:0> "this is a file ..." =~ /\.\.?/ ? true : false
   => true

refining some of the ideas in the thread:


     harp:~ > cat a.rb
     class Dir
       def empty?
         Dir.glob("#{ path }/*", File::FNM_DOTMATCH) do |e|
           return false unless %w( . .. ).include?(File::basename(e))
         end
         return true
       end
       def self.empty? path
         new(path).empty?
       end
     end

     d = Dir.new '/tmp'
     p d.empty?

     require 'fileutils'
     FileUtils.rm_f 'empty'
     FileUtils.mkdir_p 'empty'
     p(Dir.empty?('empty'))


     harp:~ > ruby a.rb
     false
     true


now we can begin the discussion on how to use such a method - since nearly any
code that did would have a race condition!  ;-)


-a
-- 
my religion is very simple.  my religion is kindness. -- the dalai lama