System.FilePath propsal (Was: Cabal feedback notes)
gk at ninebynine.org
Thu Oct 28 08:43:58 EDT 2004
Thanks for your work on this, and your responses...
At 13:05 27/10/04 -0700, Krasimir Angelov wrote:
>--- Graham Klyne <GK at ninebynine.org> wrote:
> > 1. How are multiple extensions handled? (e.g.
> > foo.tar.gz) I think this is
> > catered for, with the final extension being picked
> > off.
>splitFileExt always return the last extension.
Sounds good to me.
> > 2. How does path joining work in this case:
> > joinPaths C:/root/path/file.ext
> > altPath/file2.ext2
> > i.e. is "file.ext" discarded?
>No. You will get:
Hmmm. I can't claim it's wrong, but I'm uneasy about that. It is, for
example, different from the way that URI path joining works.
joinPaths C:/root/path/ altPath/file2.ext2
does this give:
> > 3. What is the purpose of commonInit?
>commonInit is renamed to commonParent in the last
>version. It returns the largest path that is common in
>all paths in the list.
Ah, I see.
> > Also, a very small point: I forgot that FilePath is
> > defined in the
> > prelude... maybe a comment to this effect on the
> > module export list?
>I will add FilePath to the export list (Simon's
With a comment that it is defined in the Prelude?
> > I'm rather taken by the approach that Peter Simons
> > suggests 
> > (abstracting the path composition), but I suspect
> > there are more details to
> > be worked out there. It also makes my earlier
> > suggestion  of using a
> > URI-based representation as a common abstraction
> > seem slightly less
> > radical. I also note Simon's comments on this
> > (don't do it yet_) are
> > persuasive. I'll reserve my campaign to unify
> > filenames and URIs for the
> > "ultimate" FilePath abstraction ;-)
>It could be great to have filePathToURI and
>uriToFilePath functions in Network.URI. There we can
>also have URI manipulation functions but this doesn't
>mean that we don't need have System.FilePath in
I've been toying with ideas for creating scheme-specific URI functions in
When the IETF decides what to do about the revised file: URI specification,
I might give this a try, lifting some code I wrote for XML processing.
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