From: Robert Klemme <shortcutter@...>
Date: 2007-06-14T19:05:08+09:00
Subject: Re: Dir copy with rename

On 14.06.2007 11:53, Rebhan, Gilbert wrote:
>  
> Hi,
> 
> -----Original Message-----
> From: Mariusz Pekala [mailto:skoot@ideico.net] 
> Sent: Thursday, June 14, 2007 11:26 AM
> To: ruby-talk ML
> Subject: Re: Dir copy with rename
> 
>> Dir['Y:/test/**/**'].each { |old|
>>   next if old == '.'||old== '..'||old =~ /\./
>>   unless /re/.match(old)
>>     new = old.sub(re,sub)
>>     File.rename(old,new)
>>     end
>> }
> 
> now i have 
> 
> src="Y:/test"
> 
> re=/foobar/
> sub="foobaz"
> 
> Dir[src+'/**/**/**'].each { |old|
>   next if old == '.'||old== '..'||old =~ /\./
>   puts old
>   if re.match(old) 
>     new = old.sub(re,sub)
>     File.rename(old,new)
>     end
> }
> 
> 
> when i use Dir[src] the /foobar folder on first
> level, means Y:/test/foobar gets Y:/test/foobaz and Exit 0
> 
> but when i use Dir[src+'/**'], because i want to recurse
> in all subfolders
> 
> the folder on first level gets renamed and then i get an error =
> 
>> ruby dircopy.rb
> Y:/test/sub3
> Y:/test/sub1
> Y:/test/foobar
> Y:/test/sub3/foobar
> Y:/test/sub3/foobar/foobar
> dircopy.rb:14:in `rename':
> No such file or directory - Y:/test/sub3/foobar/foobar or
> Y:/test/sub3/foobaz/foobar (Errno::ENOENT)

Your basic flaw seems to be that although the subject talks about "copy 
with rename" your code actually only renames.  That will lead to errors 
because you change the original directory tree and thus a file further 
down the hierarchy of a renamed folder does not exist any more with the 
original file name - hence you cannot rename it.  Note that Dir[] first 
generates the full list of files, so any changes you do to the 
filesystem during iteration will not be reflected in the list.

Cheers

	robert