Ruby » ruby-trunk

Hi,

In message "Re: [ruby-core:26540] [Bug #2336] pathname compare fails in windows"
    on Thu, 5 Nov 2009 04:48:46 +0900, Roger Pack <redmine@ruby-lang.org> writes:

|>> Pathname.new('c:/').relative_path_from Pathname.new('/')
|ArgumentError: different prefix: "c:/" and "/"

Could you tell me what did you expect from above code?
For me, Windows ignorant, the error seems natural consequence from
#relative_path_from.

							matz.

On Wed, Nov 4, 2009 at 6:59 PM, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
> Hi,
>
> In message "Re: [ruby-core:26540] [Bug #2336] pathname compare fails in windows"
>    on Thu, 5 Nov 2009 04:48:46 +0900, Roger Pack <redmine@ruby-lang.org> writes:
>
> |>> Pathname.new('c:/').relative_path_from Pathname.new('/')
> |ArgumentError: different prefix: "c:/" and "/"
>
> Could you tell me what did you expect from above code?
> For me, Windows ignorant, the error seems natural consequence from
> #relative_path_from.
>

Even Pathname2 [1], which was conceived as more Windows-friendly
version fails with the same error

The problem is that '/' should be considering the same drive unit as
C:/, or should be considering the current one? (Dir.pwd)


[1] http://rubyforge.org/projects/shards/
-- 
Luis Lavena
AREA 17
-
Perfection in design is achieved not when there is nothing more to add,
but rather when there is nothing more to take away.
Antoine de Saint-Exupéry

Hello,

In message "[ruby-core:26542] Re: [Bug #2336] pathname compare fails in windows"
    on Nov.05,2009 06:59:37, <matz@ruby-lang.org> wrote:
> |>> Pathname.new('c:/').relative_path_from Pathname.new('/')
> |ArgumentError: different prefix: "c:/" and "/"
> 
> Could you tell me what did you expect from above code?
> For me, Windows ignorant, the error seems natural consequence from
> #relative_path_from.

For me, Windows addict, the error seems natural consequence, too.


Regards,
-- 
U.Nakamura <usa@garbagecollect.jp>

Luis Lavena wrote:
> On Wed, Nov 4, 2009 at 6:59 PM, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
>> Hi,
>>
>> In message "Re: [ruby-core:26540] [Bug #2336] pathname compare fails in windows"
>>    on Thu, 5 Nov 2009 04:48:46 +0900, Roger Pack <redmine@ruby-lang.org> writes:
>>
>> |>> Pathname.new('c:/').relative_path_from Pathname.new('/')
>> |ArgumentError: different prefix: "c:/" and "/"
>>
>> Could you tell me what did you expect from above code?
>> For me, Windows ignorant, the error seems natural consequence from
>> #relative_path_from.
>>
> 
> Even Pathname2 [1], which was conceived as more Windows-friendly
> version fails with the same error

I try not to be smarter than the Windows API. From the 
PathRelativePathTo() documentation:

This function takes a pair of paths and generates a relative path from 
one to the other. The paths do not have to be fully-qualified, but they 
must have a common prefix, or the function will fail and return FALSE.

> The problem is that '/' should be considering the same drive unit as
> C:/, or should be considering the current one? (Dir.pwd)

Why C? Why not ENV['HOMEDRIVE']? Or the root of the current user's home 
directory? Or...well, you see where I'm going with this.

Regards,

Dan

ok ok :)
Pathname.new('/').relative_path_from Pathname.new('/')

thanks for the feedback.
-r