[Haskell] URLs in haskell module namespace
S. Alexander Jacobson
alex at alexjacobson.com
Tue Mar 22 14:56:40 EST 2005
On Tue, 22 Mar 2005, Lemmih wrote:
> The idea with Hackage was to create a central place for people to put
> software or links to software, so keeping only one server for free (as
> in beer) packages would be desirable. However, this does in no way
> limit how Hackage can be used for private code repositories.
So I assume that means you also think we need a way to locate packages
on various repositories. Would you agree that URLs would be a good
way of doing so?
>> And, if there are multiple hackage servers, we are going to need to
>> indentify the server from which a particular package originates and
>> the location of that package on that server. This proposal provides
>> an obvious method of doing so.
> Specifying sources on the cmd line or in /etc/cabal/sources.list
> sounds more maintainable to me.
Except you then need to notice when you are no longer using a
particular package and do bookkeeping. You also have no way of saying
that one of your modules is using version X of a package while another
is using version Y without command line specification.
>> If module names were with respect to packages that would be entirely
>> fine. But right now module names are global and that is a serious
> But they are! GHC can even handle several versions of the same
> package. Modules from a package wont be in scope if you hide or ignore
But suppose you want to use two different verions of the same package
in a single module....Perhaps because you need to read a file saved
with a show corresponding to an old version into a data structure
defined in the new version...
S. Alexander Jacobson tel:917-770-6565 http://alexjacobson.com
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