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Today's Topics:
1. Re: Re: problem with System.Directory.Tree (Anand Mitra)
2. Re: how to update cabal? (prad)
3. Re: Re: problem with System.Directory.Tree (Stephen Tetley)
4. cabal on windows 2000 (corentin.dup...@ext.mpsa.com)
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Message: 1
Date: Mon, 28 Jun 2010 08:50:42 +0530
From: Anand Mitra <mi...@kqinfotech.com>
Subject: Re: [Haskell-beginners] Re: problem with
System.Directory.Tree
To: Stephen Tetley <stephen.tet...@gmail.com>
Cc: beginners@haskell.org
Message-ID:
<aanlktinwdfwflcrdjkrwoq4i5cjvww5cm9jfo2a9c...@mail.gmail.com>
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Message: 2
Date: Mon, 28 Jun 2010 00:46:47 -0700
From: prad <p...@towardsfreedom.com>
Subject: [Haskell-beginners] Re: how to update cabal?
To: beginners@haskell.org
Message-ID: <20100628004647.6bf99...@gom>
Content-Type: text/plain; charset=US-ASCII
On Thu, 10 Jun 2010 12:18:02 +0200
Daniel Fischer <daniel.is.fisc...@web.de> wrote:
> The new cabal-0.8.2 is probably installed in $HOME/.cabal/bin and
> that directory isn't in your $PATH. Add it to your path (if it isn't
> in) before the directory where cabal-0.8.0 is in, so version 0.8.2 is
> found first.
thx daniel!
that would appear to have been my problem too.
for instance,
$ /usr/bin/cabal -V
cabal-install version 0.8.0
using version 1.8.0.2 of the Cabal library
vs
$ .cabal/bin/cabal -V
cabal-install version 0.8.2
using version 1.8.0.2 of the Cabal library
but after putting it in the PATH
eg in .bashrc export ~/.cabal/bin:$PATH
we get
cabal -V
cabal-install version 0.8.2
using version 1.8.0.2 of the Cabal library
--
In friendship,
prad
... with you on your journey
Towards Freedom
http://www.towardsfreedom.com (website)
Information, Inspiration, Imagination - truly a site for soaring I's
------------------------------
Message: 3
Date: Mon, 28 Jun 2010 08:53:04 +0100
From: Stephen Tetley <stephen.tet...@gmail.com>
Subject: Re: [Haskell-beginners] Re: problem with
System.Directory.Tree
To: Anand Mitra <mi...@kqinfotech.com>
Cc: beginners@haskell.org
Message-ID:
<aanlktimwm9i8fa8pgy0y0z8j1sgnznwoduh2va2b3...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi Anand
MD5Digest is an abstract type (the constructor is not exported from
its module) but it is an instance of Binary.
ClockTime (from System.Time) is not an instance of Binary but it does
export its constructor.
Neither are instances of Data.Data.
So I would hand-craft an instance of Binary for the Props datatype
rather than try to first make them instances of Data.
The code will be something like this, as I don't have MD5 installed it
is unchecked:
class Binary Props where
put (Prop md5 tim name) =
do { putWord8 0 -- number each constructor
; put md5 -- MD5Digest has a Binary instance
; putTOD tim
; put name
}
put Blank =
do { putWord8 1 } -- number each constructor
get = do { typ <- getWord8 -- get the constructor tag...
; case typ of
0 -> getProp
1 -> return Blank
}
getProp :: Get Props
getProp = do
{ md5 <- get
; tim <- getTOD
; name <- get
; return (Prop md5 tim name)
}
-- ClockTime doesn't have a binary instance
-- but a it has a single constructor
--
-- > TOD Integer Integer -
--
-- and Integer has a Binary instance, so I
-- would make auxillaris for put and get:
putTOD :: ClockTime -> Put ()
putTOD (TOD a b) = do { put a ; put b }
getTOD :: Get ClockTime
getTOD = do { a <- get; b <- get; return (TOD a b) }
------------------------------
Message: 4
Date: Mon, 28 Jun 2010 17:53:37 +0200
From: corentin.dup...@ext.mpsa.com
Subject: [Haskell-beginners] cabal on windows 2000
To: beginners@haskell.org
Message-ID:
<of46014cc8.2848edec-onc1257750.0056d5b9-c1257750.00574...@mpsa.com>
Content-Type: text/plain; charset=US-ASCII
Hello,
cabal from the new haskell platform fails on windows 2000:
http://trac.haskell.org/haskell-platform/ticket/101
Do you know of a workaround? Downgrade Cabal?
Best
Corentin
------------------------------
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