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a newbies confusion with repositories - darcs or git
by Gü?nther Schmidt 18 Mar '09

18 Mar '09

Hi, now that I'm finished with my haskell app I take the opportunity to follow up on some things I hadn't quite understood in my so far short venture into the haskell world. Means: Prepare for a number of naive posts to follow. I had the impression that darcs was the preferred repository for haskellers, but there also is git. So far I've just been using the goodol' svn. But since I have the ambition to become a real haskeller I was gonna make myself acquainted with darcs. Should I skip that and head straight for git? Günther

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Haskell and the Cell Processor
by Galchin, Vasili 17 Mar '09

17 Mar '09

Hello, http://www.power.org/resources/devcorner/cellcorner .... Is there project to port GHC to the Cell? Seems like a really cool challenge. Regards, Vasili

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Has anybody replicated =~ s/../../ or even something more basic for doing replacements with pcre haskell regexen?
by Thomas Hartman 17 Mar '09

17 Mar '09

Is there something like subRegex... something like =~ s/.../.../ in perl... for haskell pcre Regexen? I mean, subRegex from Text.Regex of course: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/regex-compat Thanks for any advice, thomas.

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can GHC build an executable from a C source file?
by Manlio Perillo 17 Mar '09

17 Mar '09

Hi. I'm checking if it possible to build an executable from C source files only. As an example: #include <stdio.h> int main () { printf("hello world\n"); return 0; } $ghc --make foo.c However this only produces the object file, foo.o; it does not build the executable file. What is the reason for this behaviour? I have tested with GHC 6.8.2. Thanks Manlio

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Data.Binary
by Galchin, Vasili 17 Mar '09

17 Mar '09

Hello, I installed ghci on my work Windows machine. If I do a ":m +Data.Word", everything is OK. If I a ":m +Data.Binary", can't be found. Why? Regards, Vasili

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RE: SQL Parsers in Haskell
by Larry Coleman 17 Mar '09

17 Mar '09

> Hi Haskelleers > > Has anybody written a SQL parser in Haskell (and is willing to share the > code) ? > > Greetings, > > Mads Lindstrøm I have a mostly-working SQL parser that I wrote to help with DBA tasks at work. I'm under one of the standard employment IP agreements, however, so my employer owns the code. I have asked about having it released, but that process will take some time. I'll post to the group if/when it ever happens. Larry Coleman

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Apologies for spamming Planet Haskell
by Bjorn Buckwalter 17 Mar '09

17 Mar '09

Dear Planet Haskell readers, Just want to apologize for spamming Planet Haskell. I did some minor formatting edits of old posts and it seems Planet Haskell picked them up and republished them. I didn't expect this to happen (Google Reader doesn't do that) and will be more careful about gratuitously editing old posts in the future. Thanks, Bjorn Buckwalter

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SQL Parsers in Haskell
by Mads Lindstrøm 17 Mar '09

17 Mar '09

Hi Haskelleers Has anybody written a SQL parser in Haskell (and is willing to share the code) ? Greetings, Mads Lindstrøm

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ANNOUNCE: libffi 0.1 released
by Remi Turk 17 Mar '09

17 Mar '09

I am happy to announce libffi 0.1, binding to the C library libffi, allowing C functions to be called whose types are not known before run-time. Why? Sometimes you can't use the haskell foreign function interface because you parse the type of the function from somewhere else, i.e. you're writing an interpreter for a language that has an FFI itself. What? The main function it exports is: callFFI :: FunPtr a -> RetType b -> [Arg] -> IO b And because code is worth a thousand words, here a small program that uses C to write a 1Gb buffer of random garbage to a file: > import System.Posix.DynamicLinker > import Foreign.LibFFI > > main = do > malloc <- dlsym Default "malloc" > creat <- dlsym Default "creat" > write <- dlsym Default "write" > let sz = 2 ^ 30 > buf <- callFFI malloc (retPtr retVoid) [argCSize sz] > fd <- callFFI creat retCInt [argString "/tmp/test", argCUInt 0o644] > n <- callFFI write retCSize [argCInt fd, argPtr buf, argCSize sz] > putStrLn $ show n ++ " bytes written" It should work on any 32/64bits machine on which libffi works, but has been primarily tested on linux x86_64. The current libffi is not exception-safe (exception = memory leak) and callFFI has quite some overhead that would be unnecessary with another api. It is, however, very easy to use :) More interesting examples are included in examples/ in the package. Where? Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/libffi Module docs: http://www.science.uva.nl/~rturk/doc/libffi-0.1 Cheers, Remi

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DLL Hell: OpenGL
by Mark Spezzano 17 Mar '09

17 Mar '09

Hi all, I’m trying to make the Teapot OpenGL example in Haskell on Windows. It keeps coming up with this: C:\Users\Mark\workspace2\OpenGLPractice\src>ghc --make Teapot Linking Teapot.exe ... C:\ghc\ghc-6.10.1\gcc-lib\ld.exe: cannot find -lSM collect2: ld returned 1 exit status As far as I know, -lSM is to do with XWindows (not windows Vista).How do I fix this ? What’s going on? I’ve been on this problem now for hours, and all I wanted to do was get a window up on the screen. Sigh Mark Spezzano No virus found in this outgoing message. Checked by AVG. Version: 7.5.557 / Virus Database: 270.11.15/2004 - Release Date: 16/03/2009 7:04 AM

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