From: "David A. Black" <dblack@...>
Date: 2008-07-28T20:35:02+09:00
Subject: Re: head/tail split for path

Hi --

On Mon, 28 Jul 2008, ara.t.howard wrote:

>
> On Jul 26, 2008, at 1:54 PM, Trans wrote:
>
>> I need to split a path by head/*tail.
>> 
>> Ex.
>>
>>   File.head_tail_split('home/foo/bar')  #=> [ 'home', 'foo/bar' ]
>> 
>> Sure, I can write a clumsy loop like the following:
>> 
>> def File.head_tail_split(fname)
>>   s = fname
>>   t = []
>>   h = nil
>>   until s == '.'
>>     t << h
>>     s, h = *split(s)
>>   end
>>   return h, File.join(*t.compact)
>> end
>> 
>> But I'm betting there's a better way. Or maybe there's already an easy
>> way I'm overlooking
>
>
>
> cfp:~ > cat a.rb
> path = File.join 'a', 'b', 'c'
>
> head, tail = path.split( File::SEPARATOR, 2 )
>
> p :head => head, :tail => tail
>
>
>
> cfp:~ > ruby a.rb
> {:tail=>"b/c", :head=>"a"}

Ironically, I tried that first and discarded it because I had
misunderstood Tom's question and thought he wanted dirname/basename,
and then didn't resurrect it when I finally understood :-) The only
tweak I might make would be to use Pathname#clean (or roll one's own)
in case there are consecutive separators.


David

-- 
Rails training from David A. Black and Ruby Power and Light:
  *  Advancing With Rails    August 18-21    Edison, NJ
  * Co-taught by D.A. Black and Erik Kastner
See http://www.rubypal.com for details and updates!