Re: [Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Richard O'Keefe
On 11/04/2012, at 4:23 PM, Arnaud Bailly wrote: > You are right, of course. By "sensible properties" I simply meant the > list of (Path, Value) is assumed to represent a tree (eg. it has been > generated by a traversal of some original tree). By "ordered" I meant > Path(s) segments are lexicograp

Re: [Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Arnaud Bailly
You are right, of course. By "sensible properties" I simply meant the list of (Path, Value) is assumed to represent a tree (eg. it has been generated by a traversal of some original tree). By "ordered" I meant Path(s) segments are lexicographically ordered and (Path, Value) are enumerated from a tr

Re: [Haskell-cafe] GHCi runtime linker: fatal error (was Installing REPA)

2012-04-10 Thread Sajith T S
Ben Lippmeier wrote: > I pushed Repa 3.1 to Hackage on the weekend. It has a *much* cleaner API. I > can't recommend continuing to use Repa 2. You will just run into all the > problems that are now fixed in Repa 3. > I was going to ask about the wiki page, and saw that you've posted a note t

[Haskell-cafe] process-conduit appears to hang on windows

2012-04-10 Thread grant
Hi, I am trying to use process-conduit on windows, but it appears to hang when using the conduitCmd. Is there a reason why this doesn't work? Thanks for any help, Grant {-# LANGUAGE QuasiQuotes #-} import System.Process.QQ import Data.Conduit import qualified Data.Conduit.Binary as CB import qua

[Haskell-cafe] XMPP library recommendations

2012-04-10 Thread John Goerzen
Hi folks, I'm looking for suggestions for XMPP libraries. So far I have found three on Hackage. Thanks to the authors of these - I think a lot of good can come from XMPP in Haskell. However, all of them appear to be minimally maintained, if at all: * XMPP - only one upload, over 2 years ag

Re: [Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Richard O'Keefe
On 10/04/2012, at 7:55 PM, Arnaud Bailly wrote: > I am manipulating labeled multiway trees, some kind of "lightweight" > XML notation. One thing I would like to be able to do is manipulating > a tree as a list of (Path, Value). Generating such a list is easy but > I am a little bit surprised to fi

Re: [Haskell-cafe] ANN: Selenium WebDriver client for Haskell

2012-04-10 Thread Felipe Almeida Lessa
That looks great, Adam, thanks for sharing! I've been using watir-webdriver but ruby tends to be a lot more painful to use than Haskell (even though I use ruby only for the tests!). Looking forward to see what I can do with your package =). Cheers, -- Felipe. _

[Haskell-cafe] ANN: Selenium WebDriver client for Haskell

2012-04-10 Thread Adam Curtis
The first release of the webdriver package has been uploaded to Hackage. Selenium is a test suite that allows you to automate web browsers on a variety of platforms. The webdriver package acts as a client library that speaks Selenium's WebDriver protocol, using a simple monadic interface. This alp

Re: [Haskell-cafe] Mixing Unboxed Mutable Vectors and Parsers

2012-04-10 Thread Twan van Laarhoven
On 2012-04-07 23:35, Myles C. Maxfield wrote: CC: Maintainers of STMonadTrans, Vector, and JuicyPixels Hello, I am writing a Haskell Attoparsec parser which will modify 2-d arrays of small values (Word8, Int8, etc.). My first idea was to simply parse all the deltas, and later apply them to the

Re: [Haskell-cafe] Mixing Unboxed Mutable Vectors and Parsers

2012-04-10 Thread Mario Blažević
On 12-04-07 05:35 PM, Myles C. Maxfield wrote: So here are my questions: ... 3. Are there any parsers that support streaming semantics and being used as a monad transformer? This would require rewriting my whole program to use this new parser, but if that's what I have to do, then so be it. H

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Karel Gardas
On 04/10/12 07:03 PM, Joey Hess wrote: BTW, the other problem with Haskell on arm is that AFAIK there is no ghci, and so also no Template Haskell, and so if you're writing Real World utilities that you want to be maximally portable, this means you have to avoid using an increasing number of libra

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Joey Hess
Joachim Breitner wrote: > Most of these architectures do not have a native code generator (so they > are compiled via C) and are unregisterized, i.e. GHC knows nothing about > their registers. Both cause a performance penalty; I don’t know numbers. > I assume this is what Joey refers to. But maybe

Re: [Haskell-cafe] ANNOUNCE: pipes-core 0.1.0

2012-04-10 Thread Paolo Capriotti
On Tue, Apr 10, 2012 at 4:50 PM, Twan van Laarhoven wrote: > I have some issues with the function names used > >    firstP :: Monad m => Pipe a b m r >              -> Pipe (Either a c) (Either b c) m r >    secondP :: Monad m => Pipe a b m r >              -> Pipe (Either c a) (Either c b) m r >

Re: [Haskell-cafe] ANNOUNCE: pipes-core 0.1.0

2012-04-10 Thread Twan van Laarhoven
On 09/04/12 23:49, Paolo Capriotti wrote: I'm pleased to announce the release of version 0.1.0 of pipes-core, a library for efficient, safe and compositional IO, similar in scope to iteratee and conduits. http://hackage.haskell.org/package/pipes-core I have some issues with the function names

[Haskell-cafe] Call for Participation: Tests and Proofs (TAP 2012) in Prague

2012-04-10 Thread Achim D. Brucker
Apologies for duplicates. CALL FOR PARTICIPATION TESTS and PROOFS 2012 (TOOLS EUROPE 2012) 6th International Conference on Tests & Proofs May 31 - June 1

Re: [Haskell-cafe] I Need a Better Functional Language!

2012-04-10 Thread Grigory Sarnitskiy
 10.04.2012, 02:00, "Ryan Ingram" : > A concurring opinion here, and an example. > > iff :: Bol -> a -> a -> a > iff True x _ = x > iff False _ x = x > > f, g :: Bool -> Bool > f x = x > g x = iff x True False > > Are these two functions equal?  I would say yes, they are.  Yet once you can > patte

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Yves Parès
Okay, thanks for the explanation. But that does not completely answer the original question: now, using branch 7 of GHC what can you do to get a haskell program compiled on/for an ARM platform without using Debian? You have to use LLVM? So you have to compile your program on a regular x86/x64 PC fo

Re: [Haskell-cafe] I Need a Better Functional Language!

2012-04-10 Thread Ertugrul Söylemez
Tillmann Rendel wrote: > > I am curious what are interesting use-cases for that? Symbolic > > analysis? self-compilers? > > Optimization. For example, imagine the following definition of > function composition: > >map f . map g = map (f . g) >f . g = \x -> f (g x) > > In Haskell, we canno

Re: [Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Arnaud Bailly
Hello Twan, I have a rather clear idea of how I would do it (in Haskell or in Java), but I feel this is something quite common that should have already been handled in other contexts (eg. XML/XPath stuff, JSon, CSS ?), hence my question which was admittedly not clear enough. Anyway, thanks a lot f

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Joachim Breitner
Hi, Am Dienstag, den 10.04.2012, 13:04 +0200 schrieb Yves Parès: > > All these are not cross-compiled, but natively > > compiled on the repective architecture, and I don’t think it is > easily > > possible to cross-compile GHC itself even today. > > So how did they get compiled the first time? H

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Yves Parès
> All these are not cross-compiled, but natively > compiled on the repective architecture, and I don’t think it is easily > possible to cross-compile GHC itself even today. So how did they get compiled the first time? How do you get a GHC working on *or* for an ARM platform if you don't use Debian

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Joachim Breitner
Hi, Am Dienstag, den 10.04.2012, 12:36 +0200 schrieb Yves Parès: > For instance, yes. > I think I had seen some times on this mailing list or on blog posts > (http://ghcarm.wordpress.com/) people having used GHC on ARM platform. > I distinctly remember having seen on the mailing list that > cross-

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Yves Parès
For instance, yes. I think I had seen some times on this mailing list or on blog posts ( http://ghcarm.wordpress.com/) people having used GHC on ARM platform. I distinctly remember having seen on the mailing list that cross-compiling wasn't working but that we now can compile with GHC on ARM, which

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Joachim Breitner
Hi, Am Dienstag, den 10.04.2012, 11:00 +0200 schrieb Yves Parès: > Plus, I believed some had used GHC for smartphones? do you refer to http://www.joachim-breitner.de/blog/archives/300-Xmonad-on-my-mobile-phone.html or something more serious? Greetings, Joachim -- Joachim "nomeata" Breitner

Re: [Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Twan van Laarhoven
On 10/04/12 09:55, Arnaud Bailly wrote: Hello, I am manipulating labeled multiway trees, some kind of "lightweight" XML notation. One thing I would like to be able to do is manipulating a tree as a list of (Path, Value). Generating such a list is easy but I am a little bit surprised to find it ha

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Yves Parès
> Other than speed, it's fine. Do we know what speed issues are due to? Plus, I believed some had used GHC for smartphones? Le 9 avril 2012 01:45, Joey Hess a écrit : > Thomas DuBuisson wrote: > > On Sun, Apr 8, 2012 at 4:03 PM, Francesco Mazzoli wrote: > > > No, it is not possible to build G

[Haskell-cafe] Reconstructing a tree from a list of its paths (to leaves)

2012-04-10 Thread Arnaud Bailly
Hello, I am manipulating labeled multiway trees, some kind of "lightweight" XML notation. One thing I would like to be able to do is manipulating a tree as a list of (Path, Value). Generating such a list is easy but I am a little bit surprised to find it harder to reconstruct a tree, given such a l

Re: [Haskell-cafe] building ghc on arch linux ARM?

2012-04-10 Thread Francesco Mazzoli
On 10/04/12 07:28, Karel Gardas wrote: On 04/ 9/12 01:03 AM, Francesco Mazzoli wrote: No, it is not possible to build GHC without GHC. Building GHC on ARM is going to be extremely tricky (I'm not sure anyone has ever done it). It's not that tricky at the end. Just install LLVM 3.0 and some OS