On 2008 May 21, at 1:37, Galchin, Vasili wrote:
I fairly innocuous question ;^). How does ghc-pkg know where are
the *package.conf files are located?
The installed ghc-pkg is a shell script, to wit:
#!/bin/sh
GHCPKGBIN=/usr/local/lib/ghc-6.8.2/ghc-pkg.bin
hmm ... ;^). I found and read through part of ghc-pkg.hs ..
ghc-6.8.2/utils/ghc-pkg/ .. I have 6 broken Haskell package databases (not
debian) under /usr/lib/haskell-packages/ghc6/lib/. When I run ghc-pkg on
them I get [EMAIL PROTECTED]:/usr/lib/haskell-packages/ghc6/lib/cairo-0.9.12.1$
ghc-pkg
I would be interested in seeing good motivating examples for use of
the state monad, other than that example from All About Monads.
Okay, it's good for randomness. What else?
Reading the source code for State, I think I saw an example about
using state to uniquely label elements of a tree with
Quoth Derek Elkins on Tue, May 20, 2008 at 11:45:57 -0500
On Tue, 2008-05-20 at 10:55 +0200, Ketil Malde wrote:
Yann Golanski [EMAIL PROTECTED] writes:
1- Get a list out of a file: I managed to do that using the following:
parseImageFile :: FilePath - IO [String]
parseImageFile
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Richard A. O'Keefe
On 21 May 2008, at 9:25 am, Conal Elliott wrote:
I think the practice of constraint in type definitions is
generally
discouraged,
Is this true? If so, why?
If I have a data type that simply
On 30/04/2008, at 5:32 PM, Malcolm Wallace wrote:
Peter Gammie [EMAIL PROTECTED] wrote:
The most-recent darcs version relies on a newer ByteString than I
have, so it is not easy for me to test it.
I believe there was a patch to fix this. Apparently only one
version of
the bytestring
Thomas Hartman wrote:
I would be interested in seeing good motivating examples for use of
the state monad...
Okay, it's good for randomness. What else?
...I saw an example about
using state to uniquely label elements of a tree
So, are there any other simple motivating examples that show what
Peter Gammie [EMAIL PROTECTED] wrote:
!ELEMENT table
(caption?, (col*|colgroup*), thead?, tfoot?, (tbody+|tr+))
Using a slightly hacked HaXml v1.13.3, I get this from DtdToHaskell:
data Table = Table Table_Attrs (Maybe Caption)
(OneOf2 [Col] [Colgroup]) (Maybe
On 21/05/2008, at 5:44 PM, Malcolm Wallace wrote:
Peter Gammie [EMAIL PROTECTED] wrote:
!ELEMENT table
(caption?, (col*|colgroup*), thead?, tfoot?, (tbody+|tr+))
Using a slightly hacked HaXml v1.13.3, I get this from DtdToHaskell:
data Table = Table Table_Attrs (Maybe Caption)
Thanks everybody for your help!
Oliver, you provided an excellent write-up on State monad without
going into 'scary' :) details, great work indeed!
Alas, in this case I need the details, and in particular the most scary
ones!
So let's start with fundamental and most intriguing (to me)
On Wed, May 21, 2008 at 8:42 AM, Dmitri O.Kondratiev [EMAIL PROTECTED]
wrote:
So let's start with fundamental and most intriguing (to me) things:
getAny :: (Random a) = State StdGen a
getAny = do g - get -- magically get the current StdGen
First line above declares a data type:
State
On 2008 May 21, at 2:35, Galchin, Vasili wrote:
hmm ... ;^). I found and read through part of ghc-pkg.hs ..
ghc-6.8.2/utils/ghc-pkg/ .. I have 6 broken Haskell package
databases (not debian) under /usr/lib/haskell-packages/ghc6/lib/.
When I run ghc-pkg on them I get [EMAIL
Dmitri O.Kondratiev wrote:
Thanks everybody for your help!
Oliver, you provided an excellent write-up on State monad without
going into 'scary' :) details, great work indeed!
Alas, in this case I need the details, and in particular the most scary
ones!
So let's start with fundamental
State is a data type. As any other data type it can be instantiated. State
instance is a structure of one record that contains (\s -(a,s)) lambda
function. This function can be parametrized by types of its arguments 's'
and 'a'. I don't see magic here :)
Ok, then from declaration:
getAny ::
Jules,
Stupid question, please bear with me:
x :: Int -- x declared, but not constructed
x = 1 -- x constructed
s1 :: State StdGen a -- s1 declared, yes, but why s1 is *also already
constructed* ?
On Wed, May 21, 2008 at 6:54 PM, Jules Bean [EMAIL PROTECTED] wrote:
Dmitri O.Kondratiev wrote:
Dmitri O.Kondratiev wrote:
Jules,
Stupid question, please bear with me:
x :: Int -- x declared, but not constructed
x = 1 -- x constructed
s1 :: State StdGen a -- s1 declared, yes, but why s1 is *also already
constructed* ?
it's not.
it's constructed when you do
s1 = return 1
... or ...
Hi,
I'm currently writing a parser using the Parsec library. What I want is
to store the order of each subparser called in a user state. So every
single parser will be marked with a label that is stored in a special
treelike structure when the parser is run.
My problem is to return the last
That worked. Thank you.
Date: Wed, 21 May 2008 12:22:33 -0400
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: [Haskell-cafe] Installing Cabal-Install
CC: haskell-cafe@haskell.org
On Wed, May 21, 2008 at 12:11 PM, Aditya Siram wrote:
Maciej Podgurski [EMAIL PROTECTED] wrote:
Hi,
I'm currently writing a parser using the Parsec library. What I want
is to store the order of each subparser called in a user state. So
every single parser will be marked with a label that is stored in a
special treelike structure when the
Dan Doel wrote:
On Tuesday 20 May 2008, [EMAIL PROTECTED] wrote:
Actually, it's true less than 50% of the time. In particular, it's
not true of any monad transformer.
Sure it is. Any particular transformer t typically comes with some particular
way of writing a function of type t m a - m a
Woo!
Salvatore kindly sent me a Darcs patch, and applying it does indeed make it run
faster. Yay!
[Note that -fvia-c works just fine for me. It doesn't appear to produce a huge
speed difference, but it compiles just fine.]
Thanks for the tips, guys! :-D The changes are in the online Darcs
2008/5/21 Andrew Coppin [EMAIL PROTECTED]:
Woo!
Salvatore kindly sent me a Darcs patch, and applying it does indeed make it
run faster. Yay!
Hi Andrew,
I'm glad that -fvia-c works for you: maybe it's a Mac OS X specific bug?
Anyway, did you compile with -fvia-c -optc-O3? I expect
-- Jules, Oliver, thanks! Things are getting clarified, I hope.
-- Let me summarize how I now understand getAny operation, please correct me
if I am wrong.
getAny :: (Random a) = State StdGen a
getAny = do g - get
(x,g') - return $ random g
put g'
return x
{--
Hello,
https://bugs.launchpad.net/ubuntu/+source/gtk2hs/+bug/229489
this is almost identical to my problem. I am just trying to help others on
this list who are using Ubuntu Linux to avoid my predicament!
Kind regards, Vasili
___
Now you tell me! I also upgraded late last night and got the exact same
problem. :(
I just uninstalled the ghc from the Update Manager and was going to
reinstall tonight. Are you saying that something else is screwed up
because of this?
Galchin, Vasili wrote:
Hello,
Hi Dan,
I am still looking into this myself. I just stumbled across the URL
below. i would suggest keeping an eye on this URL for more news.
Vasili
On Wed, May 21, 2008 at 5:45 PM, Dan Weston [EMAIL PROTECTED]
wrote:
Now you tell me! I also upgraded late last night and got the exact same
I'm kind of stuck that's why I'm posting here to ask wether this makes
sense at all, maybe someone else has already done it?
What I'd like to have:
Some way representing relational data which is typically stored in
databases such as Postgresql..
Rewriting something like Postgresql in haskell
I certainly don't use 50% IO monads. I regard any use of the IO monad
except at the top level as a failure. :)
On Wed, May 21, 2008 at 7:14 PM, Dan Weston [EMAIL PROTECTED] wrote:
Dan Doel wrote:
On Tuesday 20 May 2008, [EMAIL PROTECTED] wrote:
Actually, it's true less than 50% of the time.
lennart:
I certainly don't use 50% IO monads. I regard any use of the IO monad
except at the top level as a failure. :)
IO fail
-- Don
Background: http://failblog.org/
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
On Wed, May 21, 2008 at 4:08 PM, Lennart Augustsson
[EMAIL PROTECTED] wrote:
I certainly don't use 50% IO monads. I regard any use of the IO monad
except at the top level as a failure. :)
Real Haskell Programmers Only Use Top Level IO!
(But then again, real programmers wouldn't use Haskell:
Hi
Real Haskell Programmers Only Use Top Level IO!
(But then again, real programmers wouldn't use Haskell:
http://www.pbm.com/~lindahl/real.programmers.html)
It's amazing how many phone interviews I've done where the HR person
at the other end tries to tick the knows Pascal box, despite me
On Wed, May 21, 2008 at 6:37 PM, Neil Mitchell [EMAIL PROTECTED] wrote:
Hi
Real Haskell Programmers Only Use Top Level IO!
(But then again, real programmers wouldn't use Haskell:
http://www.pbm.com/~lindahl/real.programmers.htmlhttp://www.pbm.com/%7Elindahl/real.programmers.html
)
On Wed, May 21, 2008 at 05:05:21PM -0700, Jeremy Shaw wrote:
At Thu, 22 May 2008 01:04:24 +0200,
Marc Weber wrote:
Some way representing relational data which is typically stored in
databases such as Postgresql..
Rewriting something like Postgresql in haskell would take ages..
So
Consider SQLite [1], which is a software library that implements a
self-contained, serverless, zero-configuration, transactional SQL
database engine.
It is embeddable, can reside completely in memory (including the data),
and can be saved and restored to disk when needed. It neatly fills the
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