From: Daniel Berger <Daniel.Berger@...>
Date: 2005-08-19T04:17:53+09:00
Subject: Re: Idiomatic ruby version of this code?

why the lucky stiff wrote:
> Daniel Berger wrote:
> 
>> gsub and backreferences?  Why take that approach when File.basename is 
>> available?
>>
>> def switch(old, new)
>>    Dir["*.#{old}"].each{ |file|
>>       new_name = File.basename(file, old) + "." + new
>>       File.rename(file, new_name)
>>    }
>> end
> 
> You understand he's trying to swap extensions, right?  (I think?)  Well, 
> you've got to get the extension name.  And File.extname( file )[1..-1] 
> is ugly.
> 
> I always go for short and dirty.  I steal second base!
> 
> _why

Oh, he wants to switch both.  Hm, ok.  Still no gsub or backreferences:

djberge@~/programming/ruby/temp-670>cat switcher.rb
Dir["*.{mp3,temp}"].each{ |file|
    ext = File.extname(file) == ".mp3" ? ".temp" : ".mp3"
    new_name = File.basename(file, ".*") + ext
    File.rename(file, new_name)
}
djberge@~/programming/ruby/temp-671>ls -l
total 2
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 bar.temp
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 baz.mp3
-rw-r--r--   1 djberge  staff          0 Aug 18 13:09 blah.nada
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 foo.mp3
-rw-r--r--   1 djberge  staff        169 Aug 18 13:15 switcher.rb
djberge@~/programming/ruby/temp-672>ruby switcher.rb
djberge@~/programming/ruby/temp-673>ls -l
total 2
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 bar.mp3
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 baz.temp
-rw-r--r--   1 djberge  staff          0 Aug 18 13:09 blah.nada
-rw-r--r--   1 djberge  staff          0 Aug 18 13:08 foo.temp
-rw-r--r--   1 djberge  staff        169 Aug 18 13:15 switcher.rb