- Haskell-Cafe - Haskell.org

ANN: acme-dont
by Gracjan Polak 10 Nov '09

10 Nov '09

Hello fellow haskellers, While reading reddit in the morning today: http://www.reddit.com/r/programming/comments/a26fe/dont/ I was shocked and surprised to see that Haskell lacks a very important feature present in Perl. It appeared that Haskell cannot not do monadic actions! I decided to act as fast as possible. Luckily, monads enable us to create control flow constructs on enterprise level. I'm proud to present the Acme.Dont module, that implements the indispensable don't monadic action. http://hackage.haskell.org/package/acme-dont-1.0 With special apologies to Luke Palmer that it took the Haskell community 7.5 years to catch up with Perl. Thanks go to Damian Conway. Have fun! Gracjan

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Exciting job opportunity
by siki 09 Nov '09

09 Nov '09

Principal investment firm based in Manhattan is looking for an outstanding software developer to maintain and develop proprietary accounting and portfolio management systems. You should have at least a bachelor’s degree in computer science from a top university and impeccable coding style. This is a high-impact, high-visibility job opportunity where successful candidates will be entrusted with a lot of responsibility for products that have a direct effect on the P&L of the firm and influences our workflow. This is a very small hedge fund with me being the only developer right now. The next hire will have a very direct say into how this side of our business progresses from here. We are a growth oriented firm that values people who take a craftsman’s pride in their work. We always like to take a contrarian view of things and value experimenting and using often overlooked technologies. That is one of the main reasons why we currently started using Haskell in developing our quantitative models. We are looking for a canditate who shows strong analytical, organizational, and communication skills. Attention to detail is essential, i.e. we fully document everything we do and pay a lot of attention to coding style. The majority of our existing code was written in Java, so candidates must have at least some experience with Java and related technologies. Experience working with SQL would be desired as well. Background in accounting is not necessary but is definitely a plus. Please send your CV and cover letter to recruitment at karamaan.com, or reply to this post if you have any questions. Thanks -- View this message in context: http://old.nabble.com/Exciting-job-opportunity-tp26275652p26275652.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.

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Type-indexed expressions with fixpoint
by Brent Yorgey 09 Nov '09

09 Nov '09

Hi all, This email is literate Haskell. I'm struggling to come up with the right way to add a fixpoint constructor to an expression language described by a type-indexed GADT (details below). Any suggestions, comments, or pointers welcome. > {-# LANGUAGE KindSignatures, GADTs #-} Consider the following type-indexed GADT, which encodes descriptions of polymorphic regular types: > data U :: (* -> *) -> * where > Unit :: U None > Var :: U Id > (:+:) :: U f -> U g -> U (Sum f g) > (:*:) :: U f -> U g -> U (Prod f g) > > data None a = None > data Id a = Id a > data Sum f g a = Inl (f a) | Inr (g a) > data Prod f g a = Prod (f a) (g a) Given u :: U f, thanks to the type indexing, we can write the following function to enumerate all the shapes of a given size described by u: > enumShapes :: Int -> U f -> [f ()] > enumShapes 0 Unit = [None] > enumShapes _ Unit = [] > enumShapes 1 Var = [Id ()] > enumShapes _ Var = [] > enumShapes n (f :+: g) = map Inl (enumShapes n f) ++ map Inr (enumShapes n g) > enumShapes n (f :*: g) = [ Prod x y | x <- enumShapes n f, y <- enumShapes n g ] But of course this isn't very interesting without adding a least fixpoint constructor. That is, I'd like to have something like data U :: (* -> *) -> * where Unit :: U None Var :: U Id (:+:) :: U f -> U g -> U (Sum f g) (:*:) :: U f -> U g -> U (Prod f g) Mu :: ??? enumShapes n (Mu ...) = ... But I am quite at a loss as far as expressing the type of Mu. If the GADT wasn't type-indexed, I'd just use HOAS, i.e. Mu :: (U -> U) -> U; but since Haskell doesn't have type-level lambdas, I don't see how to make that work. Suggestions greatly appreciated! Pointing out that I am looking at this in the wrong way (if you think such is the case) would be highly appreciated as well. thanks, -Brent

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Observer pattern in Haskell?
by Andy Gimblett 09 Nov '09

09 Nov '09

Hi all, I've been doing some GUI programming recently, using wx. To help manage dependencies between state and UI elements, I looked for a Haskell version of the Observer design pattern, and I found an implementation written by Bastiaan Heeren of ou.nl [1]. It pretty much did what I wanted, though I made a few changes along the way. Since this seems to be of general use (ie beyond wx), I've proposed to Bastiaan that I package it up for release on hackage, and he's happy for me to do so. Before I do so, I thought I'd ask for comments. The code is on github: http://github.com/gimbo/observer.hs where we have: Control.Observer - a typeclass for observable objects. Control.Observer.Synchronous - an implementation based on IORefs. This is essentially the same as Bastiaan's original, except I've changed the names, split it into two modules, commented it, added one or two small things, and Cabalised it. I've also made a branch where Control.Observer.Synchronous uses MVars instead of IORefs, in an attempt to achieve thread safety: http://github.com/gimbo/observer.hs/blob/threadsafeSync/Control/Observer/Sy… Now, before I make a hackage release: 0. Is this completely insane, in a Haskell setting? Are there better ways to do this that aren't laden with OO-worldview baggage? 1. Does anyone have any comments, on either version? 2. In particular, is the MVar version sensible? I'm aiming for mutual exclusion between threads. I _think_ I've got it, but I'm perhaps not familiar enough with the semantics of MVar to be certain. Advice appreciated. If it _is_ sensible, then is there any reason not to just use this, and discard the IORef version? The current implementation is synchronous, in that any observer functions are called immediately and synchronously (and in the same thread as the change of subject value). I'm pondering extending the package with an asynchronous version where the update just trips a flag, and the observer function picks this up later - possibly in another thread. The idea there is to help in cases where certain operations have to be in a particular thread. But this will mean a change to the typeclass too, I guess - or the addition of another one for observers themselves. Again, any thoughts? Thanks! -Andy [1] http://www.cs.uu.nl/wiki/bin/view/Afp0607/ExerciseWXHaskell

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classes question
by Paul Tokarev 09 Nov '09

09 Nov '09

Hi. I am using Hugs 98 I have that piece of code: class PlusTimes a where plus :: a -> a -> a instance PlusTimes Int where plus x y = x + y when I run : "plus 2 3" I get this error: ERROR - Unresolved overloading *** Type : (Num a, PlusTimes a) => a *** Expression : plus 2 3 What am I doing wrong? Thanks. -- View this message in context: http://old.nabble.com/classes-question-tp26271257p26271257.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.

3 5

strict mapM implementation correctness
by Paolo Losi 09 Nov '09

09 Nov '09

Hi all, while coding recently I came across the need for a strict mapM (that I indicidently use for m = MaybeT IO). I implementented this with the following simple code (it works for my use case): mapM' :: Monad m => (a-> m b) -> [a] -> m [b] mapM' _ [] = return [] mapM' f (x:xs) = do y <- f x ys <- y `seq` mapM' f xs return (y:ys) Now a couple of questions: 1. is it so "rare" to need such a beast? Why there isn't anything like that in standard libraries? 2. Is my implementation correct? 3. I've seen that mapM is implemented in base via sequence (which is in turn based on foldr). Is that any specific reason to prefer base implementation to mine? Thanks! Pao

1 0

O'Haskell
by shengwang 09 Nov '09

09 Nov '09

Hi, Somebody has idea, how to achieve reactive in O'Haskell? Shawn Wang _________________________________________________________________ MSN十年回馈，每位用户可免费获得价值25元的卡巴斯基反病毒软件2010激活码，快来领取！ http://kaba.msn.com.cn/?k=1

2 1

cabal install on Windows
by Jian Fan 09 Nov '09

09 Nov '09

Does cabal install --user or --prefix work on Windows at all? I tried: cabal install colour --user cabal install --user colour etc and all failed because install try to install at c:Program Files which I don't have permission writing. I have: cabal-install version 0.6.2 using version 1.6.0.3 of the Cabal library The Glorious Glasgow Haskell Compilation System, version 6.10.4 Thanks Jian ~ ~ ~ ~ ~ ~

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cabal with non-default cc1
by Daniel Kahlenberg 09 Nov '09

09 Nov '09

Hello friends, I want a package which can't be built with the version of gcc coming with the current release of ghc, so I installed a sufficient version of gcc and called cabal with the parameters that should override it's default settings (see the failure.log, line 112). But I have the impression(*) that the remaining process doesn't use my settings related to the version of cc1 to use but still uses the one coming with ghc (6.10.4). Can you help further? Cheers Daniel * See: "*** Assembler:", "*** Linker:" searching for ghc in path. found ghc at e:\programme\ghc\ghc-6.10.4\bin\ghc.exe ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc.exe",["--numeric-version"]) e:\programme\ghc\ghc-6.10.4\bin\ghc.exe is version 6.10.4 looking for package tool: ghc-pkg near compiler in e:\programme\ghc\ghc-6.10.4\bin found package tool in e:\programme\ghc\ghc-6.10.4\bin\ghc-pkg.exe ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc-pkg.exe",["--version"]) e:\programme\ghc\ghc-6.10.4\bin\ghc-pkg.exe is version 6.10.4 ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc.exe",["--supported-languages"]) Reading installed packages... ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc-pkg.exe",["dump","--global"]) ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc-pkg.exe",["dump","--package-conf=h:\\.homedir\\ghc\\i386-mingw32-6.10.4\\package.conf"]) Reading available packages... Resolving dependencies... selecting bindings-common-1.3.3 (hackage) and discarding bindings-common-0.1, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.2, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.2.6, 1.0, 1.1, 1.2, 1.3, 1.3.1 and 1.3.2 selecting base-3.0.3.1 (installed) and 4.1.0.0 (installed) and discarding syb-0.1.0.0 and 0.1.0.1 selecting ghc-prim-0.1.0.0 (installed) selecting integer-0.1.0.1 (installed) selecting rts-1.0 (installed) selecting syb-0.1.0.1 (installed) In order, the following would be installed: bindings-common-1.3.3 (new package) bindings-common-1.3.3 has already been downloaded. Extracting C:\Dokumente und Einstellungen\Zyx\Anwendungsdaten\cabal\packages\hackage.haskell.org\bindings-common\1.3.3\bindings-common-1.3.3.tar.gz to c:\DOKUME~1\Zyx\LOKALE~1\Temp\bindings-common-1.3.31176... Using external setup method with build-type Simple Creating h:\.homedir\hugsdata\setup (and its parents) Using Cabal library version 1.6.0.3 Using h:\.homedir\hugsdata\setup\setup.hs as setup script. Setup script is out of date, compiling... ("e:\\programme\\ghc\\ghc-6.10.4\\bin\\ghc.exe",["-v","--make","h:\\.homedir\\hugsdata\\setup\\setup.hs","-o","h:\\.homedir\\hugsdata\\setup\\setup.exe","-odir","h:\\.homedir\\hugsdata\\setup","-hidir","h:\\.homedir\\hugsdata\\setup","-i","-ic:\\DOKUME~1\\Zyx\\LOKALE~1\\Temp\\bindings-common-1.3.31176\\bindings-common-1.3.3","-no-user-package-conf","-package-conf","h:\\.homedir\\ghc\\i386-mingw32-6.10.4\\package.conf","-package","Cabal-1.6.0.3"]) Glasgow Haskell Compiler, Version 6.10.4, for Haskell 98, stage 2 booted by GHC version 6.10.1 Using package config file: E:\programme\ghc\ghc-6.10.4\package.conf Using package config file: h:\.homedir\ghc\i386-mingw32-6.10.4\package.conf Using package config file: h:\.homedir\ghc\i386-mingw32-6.10.4\package.conf hiding package base-3.0.3.1 to avoid conflict with later version base-4.1.0.0 hiding package regex-base-0.72.0.2 to avoid conflict with later version regex-base-0.93.1 hiding package parsec-2.1.0.1 to avoid conflict with later version parsec-3.0.1 hiding package QuickCheck-1.2.0.0 to avoid conflict with later version QuickCheck-2.1.0.2 wired-in package ghc-prim mapped to ghc-prim-0.1.0.0 wired-in package integer mapped to integer-0.1.0.1 wired-in package base mapped to base-4.1.0.0 wired-in package rts mapped to rts-1.0 wired-in package haskell98 mapped to haskell98-1.0.1.0 wired-in package syb mapped to syb-0.1.0.1 wired-in package template-haskell mapped to template-haskell-2.3.0.1 wired-in package dph-seq mapped to dph-seq-0.3 wired-in package dph-par mapped to dph-par-0.3 Hsc static flags: -static *** Chasing dependencies: Chasing modules from: *H:\.homedir\hugsdata\setup\setup.hs Stable obj: [] Stable BCO: [] Ready for upsweep [NONREC ModSummary { ms_hs_date = Mon Nov 9 14:45:34 Westeuropäische Normalzeit 2009 ms_mod = main:Main, ms_imps = [Distribution.Simple] ms_srcimps = [] }] compile: input file H:\.homedir\hugsdata\setup\setup.hs Created temporary directory: C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0 *** Checking old interface for main:Main: [1 of 1] Compiling Main ( H:\.homedir\hugsdata\setup\setup.hs, H:\.homedir\hugsdata\setup\Main.o ) *** Parser: *** Renamer/typechecker: *** Desugar: Result size = 8 *** Simplify: Result size = 6 Result size = 6 *** Tidy Core: Result size = 6 writeBinIface: 1 Names writeBinIface: 28 dict entries *** CorePrep: Result size = 6 *** Stg2Stg: *** CodeGen: *** CodeOutput: *** Assembler: E:\programme\ghc\ghc-6.10.4\gcc -BE:\programme\ghc\ghc-6.10.4\gcc-lib/ -IE:\programme\ghc\ghc-6.10.4\include/mingw -IH:\.homedir\hugsdata\setup -c C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.s -o h:\.homedir\hugsdata\setup\Main.o *** Deleting temp files: Deleting: C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.s Upsweep completely successful. *** Deleting temp files: Deleting: link: linkables are ... LinkableM (Mon Nov 9 14:45:34 Westeuropäische Normalzeit 2009) main:Main [DotO h:\.homedir\hugsdata\setup\Main.o] Linking h:\.homedir\hugsdata\setup\setup.exe ... *** Windres: E:\programme\ghc\ghc-6.10.4\bin/windres --preprocessor="E:\programme\ghc\ghc-6.10.4\gcc" "-BE:\programme\ghc\ghc-6.10.4\gcc-lib/" "-IE:\programme\ghc\ghc-6.10.4\include/mingw" "-E" "-xc" "-DRC_INVOKED" --use-temp-file --input=C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.rc --output=C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.o --output-format=coff *** Linker: E:\programme\ghc\ghc-6.10.4\gcc -BE:\programme\ghc\ghc-6.10.4\gcc-lib/ -IE:\programme\ghc\ghc-6.10.4\include/mingw -v -o h:\.homedir\hugsdata\setup\setup.exe -DDONT_WANT_WIN32_DLL_SUPPORT h:\.homedir\hugsdata\setup\Main.o C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.o -Lh:\.homedir\.cabal\Cabal-1.6.0.3\ghc-6.10.4 -LE:\programme\ghc\ghc-6.10.4\process-1.0.1.1 -LE:\programme\ghc\ghc-6.10.4\pretty-1.0.1.0 -LE:\programme\ghc\ghc-6.10.4\directory-1.0.0.3 -LE:\programme\ghc\ghc-6.10.4\old-time-1.0.0.2 -LE:\programme\ghc\ghc-6.10.4\old-locale-1.0.0.1 -LE:\programme\ghc\ghc-6.10.4\filepath-1.1.0.2 -LE:\programme\ghc\ghc-6.10.4\Win32-2.2.0.0 -LE:\programme\ghc\ghc-6.10.4\bytestring-0.9.1.4 -LE:\programme\ghc\ghc-6.10.4\containers-0.2.0.1 -LE:\programme\ghc\ghc-6.10.4\array-0.2.0.0 -LE:\programme\ghc\ghc-6.10.4\syb-0.1.0.1 -LE:\programme\ghc\ghc-6.10.4\base-4.1.0.0 -LE:\programme\ghc\ghc-6.10.4\integer-0.1.0.1 -LE:\programme\ghc\ghc-6.10.4\ghc-prim-0.1.0.0 -LE:\programme\ghc\ghc-6.10.4 -LE:\programme\ghc\ghc-6.10.4/gcc-lib -lHSCabal-1.6.0.3 -lHSprocess-1.0.1.1 -lHSpretty-1.0.1.0 -lHSdirectory-1.0.0.3 -lHSold-time-1.0.0.2 -lHSold-locale-1.0.0.1 -lHSfilepath-1.1.0.2 -lHSWin32-2.2.0.0 -luser32 -lgdi32 -lwinmm -ladvapi32 -lHSbytestring-0.9.1.4 -lHScontainers-0.2.0.1 -lHSarray-0.2.0.0 -lHSsyb-0.1.0.1 -lHSbase-4.1.0.0 -lwsock32 -luser32 -lshell32 -lHSinteger-0.1.0.1 -lHSghc-prim-0.1.0.0 -lHSrts -lm -lffi -lgmp -lwsock32 -u _ghczmprim_GHCziTypes_Izh_static_info -u _ghczmprim_GHCziTypes_Czh_static_info -u _ghczmprim_GHCziTypes_Fzh_static_info -u _ghczmprim_GHCziTypes_Dzh_static_info -u _base_GHCziPtr_Ptr_static_info -u _base_GHCziWord_Wzh_static_info -u _base_GHCziInt_I8zh_static_info -u _base_GHCziInt_I16zh_static_info -u _base_GHCziInt_I32zh_static_info -u _base_GHCziInt_I64zh_static_info -u _base_GHCziWord_W8zh_static_info -u _base_GHCziWord_W16zh_static_info -u _base_GHCziWord_W32zh_static_info -u _base_GHCziWord_W64zh_static_info -u _base_GHCziStable_StablePtr_static_info -u _ghczmprim_GHCziTypes_Izh_con_info -u _ghczmprim_GHCziTypes_Czh_con_info -u _ghczmprim_GHCziTypes_Fzh_con_info -u _ghczmprim_GHCziTypes_Dzh_con_info -u _base_GHCziPtr_Ptr_con_info -u _base_GHCziPtr_FunPtr_con_info -u _base_GHCziStable_StablePtr_con_info -u _ghczmprim_GHCziBool_False_closure -u _ghczmprim_GHCziBool_True_closure -u _base_GHCziPack_unpackCString_closure -u _base_GHCziIOBase_stackOverflow_closure -u _base_GHCziIOBase_heapOverflow_closure -u _base_ControlziExceptionziBase_nonTermination_closure -u _base_GHCziIOBase_blockedOnDeadMVar_closure -u _base_GHCziIOBase_blockedIndefinitely_closure -u _base_ControlziExceptionziBase_nestedAtomically_closure -u _base_GHCziWeak_runFinalizzerBatch_closure -u _base_GHCziTopHandler_runIO_closure -u _base_GHCziTopHandler_runNonIO_closure -u _base_GHCziConc_runHandlers_closure -u _base_GHCziConc_ensureIOManagerIsRunning_closure Reading specs from E:/programme/ghc/ghc-6.10.4/gcc-lib/specs Configured with: ../gcc-3.4.5-20060117-3/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=c,c++,f77,ada,objc,java --disable-win32-registry --disable-shared --enable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x --enable-java-gc=boehm --disable-libgcj-debug --enable-interpreter --enable-hash-synchronization --enable-libstdcxx-debug Thread model: win32 gcc version 3.4.5 (mingw-vista special r3) E:/programme/ghc/ghc-6.10.4/gcc-lib/collect2.exe -Bdynamic -o h:\.homedir\hugsdata\setup\setup.exe -u _ghczmprim_GHCziTypes_Izh_static_info -u _ghczmprim_GHCziTypes_Czh_static_info -u _ghczmprim_GHCziTypes_Fzh_static_info -u _ghczmprim_GHCziTypes_Dzh_static_info -u _base_GHCziPtr_Ptr_static_info -u _base_GHCziWord_Wzh_static_info -u _base_GHCziInt_I8zh_static_info -u _base_GHCziInt_I16zh_static_info -u _base_GHCziInt_I32zh_static_info -u _base_GHCziInt_I64zh_static_info -u _base_GHCziWord_W8zh_static_info -u _base_GHCziWord_W16zh_static_info -u _base_GHCziWord_W32zh_static_info -u _base_GHCziWord_W64zh_static_info -u _base_GHCziStable_StablePtr_static_info -u _ghczmprim_GHCziTypes_Izh_con_info -u _ghczmprim_GHCziTypes_Czh_con_info -u _ghczmprim_GHCziTypes_Fzh_con_info -u _ghczmprim_GHCziTypes_Dzh_con_info -u _base_GHCziPtr_Ptr_con_info -u _base_GHCziPtr_FunPtr_con_info -u _base_GHCziStable_StablePtr_con_info -u _ghczmprim_GHCziBool_False_closure -u _ghczmprim_GHCziBool_True_closure -u _base_GHCziPack_unpackCString_closure -u _base_GHCziIOBase_stackOverflow_closure -u _base_GHCziIOBase_heapOverflow_closure -u _base_ControlziExceptionziBase_nonTermination_closure -u _base_GHCziIOBase_blockedOnDeadMVar_closure -u _base_GHCziIOBase_blockedIndefinitely_closure -u _base_ControlziExceptionziBase_nestedAtomically_closure -u _base_GHCziWeak_runFinalizzerBatch_closure -u _base_GHCziTopHandler_runIO_closure -u _base_GHCziTopHandler_runNonIO_closure -u _base_GHCziConc_runHandlers_closure -u _base_GHCziConc_ensureIOManagerIsRunning_closure E:/programme/ghc/ghc-6.10.4/gcc-lib/crt2.o E:/programme/ghc/ghc-6.10.4/gcc-lib/crtbegin.o -Lh:\.homedir\.cabal\Cabal-1.6.0.3\ghc-6.10.4 -LE:\programme\ghc\ghc-6.10.4\process-1.0.1.1 -LE:\programme\ghc\ghc-6.10.4\pretty-1.0.1.0 -LE:\programme\ghc\ghc-6.10.4\directory-1.0.0.3 -LE:\programme\ghc\ghc-6.10.4\old-time-1.0.0.2 -LE:\programme\ghc\ghc-6.10.4\old-locale-1.0.0.1 -LE:\programme\ghc\ghc-6.10.4\filepath-1.1.0.2 -LE:\programme\ghc\ghc-6.10.4\Win32-2.2.0.0 -LE:\programme\ghc\ghc-6.10.4\bytestring-0.9.1.4 -LE:\programme\ghc\ghc-6.10.4\containers-0.2.0.1 -LE:\programme\ghc\ghc-6.10.4\array-0.2.0.0 -LE:\programme\ghc\ghc-6.10.4\syb-0.1.0.1 -LE:\programme\ghc\ghc-6.10.4\base-4.1.0.0 -LE:\programme\ghc\ghc-6.10.4\integer-0.1.0.1 -LE:\programme\ghc\ghc-6.10.4\ghc-prim-0.1.0.0 -LE:\programme\ghc\ghc-6.10.4 -LE:\programme\ghc\ghc-6.10.4/gcc-lib -LE:/programme/ghc/ghc-6.10.4/gcc-lib h:\.homedir\hugsdata\setup\Main.o C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.o -lHSCabal-1.6.0.3 -lHSprocess-1.0.1.1 -lHSpretty-1.0.1.0 -lHSdirectory-1.0.0.3 -lHSold-time-1.0.0.2 -lHSold-locale-1.0.0.1 -lHSfilepath-1.1.0.2 -lHSWin32-2.2.0.0 -luser32 -lgdi32 -lwinmm -ladvapi32 -lHSbytestring-0.9.1.4 -lHScontainers-0.2.0.1 -lHSarray-0.2.0.0 -lHSsyb-0.1.0.1 -lHSbase-4.1.0.0 -lwsock32 -luser32 -lshell32 -lHSinteger-0.1.0.1 -lHSghc-prim-0.1.0.0 -lHSrts -lm -lffi -lgmp -lwsock32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -luser32 -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt E:/programme/ghc/ghc-6.10.4/gcc-lib/crtend.o link: done *** Deleting temp files: Deleting: C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.o C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0/ghc2388_0.rc *** Deleting temp dirs: Deleting: C:\DOKUME~1\Zyx\LOKALE~1\Temp\/ghc2388_0 h:\.homedir\hugsdata\setup\setup.exe configure --verbose=3 --builddir=h:\.homedir\hugsdata --ghc --prefix=h:\.homedir\.cabal --datadir=h:\.homedir\.cabal --configure-option=CC=e:\programme\mingw-gcc4\bin\gcc.exe --user --package-db=h:\.homedir\ghc\i386-mingw32-6.10.4\package.conf --extra-include-dirs=e:/programme/ghc/mingw-gcc4/include --extra-lib-dirs=e:/programme/ghc/mingw-gcc4/lib --constraint=base ==3.0.3.1 --with-gcc=e:\programme\ghc\mingw-gcc4\bin\gcc.exe --with-ld=e:\programme\ghc\mingw-gcc4\bin\ld.exe --gcc-option=-v --gcc-option=-Wall Redirecting build log to {handle: h:\.homedir\hugsdata\build-bindings-common-1.3.3-ghc-6.10.4.log} Using external setup method with build-type Simple Creating h:\.homedir\hugsdata\setup (and its parents) Using Cabal library version 1.6.0.3 Using h:\.homedir\hugsdata\setup\setup.hs as setup script. h:\.homedir\hugsdata\setup\setup.exe build --verbose=3 --builddir=h:\.homedir\hugsdata Redirecting build log to {handle: h:\.homedir\hugsdata\build-bindings-common-1.3.3-ghc-6.10.4.log} cabal.exe: Error: some packages failed to install: bindings-common-1.3.3 failed during the building phase. The exception was: exit: ExitFailure 1

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Re: [Haskell-cafe] Haskell image libraries
by Pierre-Etienne Meunier 09 Nov '09

09 Nov '09

there is also a binding for libGD on hackage : http://hackage.haskell.org/package/gd And, of course, you can improve it, or write a binding to a more complete library. Or, even better, write a mix between http://www.libpng.org/pub/png/pngdocs.html and http://hackage.haskell.org/package/binary

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