September 2009 - Haskell-Cafe

Failure to build curl bindings on alpha
by Erik de Castro Lopo 08 Sep '09

08 Sep '09

Hi all, I am the Debian Maintainer of the haskell curl bindings which is failing to build on the alpha CPU with the following error: [7 of 8] Compiling Network.Curl.Easy ( Network/Curl/Easy.hs, dist/build/Network/Curl/Easy.o ) Network/Curl/Easy.hs:218:0: On Alpha, I can only handle 32 bytes of non-floating-point arguments to foreign export dynamic When checking declaration: foreign import ccall safe "wrapper" mkProgress :: ProgressFunction -> IO (FunPtr ProgressFunction) Network/Curl/Easy.hs:221:0: On Alpha, I can only handle 32 bytes of non-floating-point arguments to foreign export dynamic When checking declaration: foreign import ccall safe "wrapper" mkDebugFun :: DebugFunctionPrim -> IO (FunPtr DebugFunctionPrim) The GHC version is 6.10.4 and the full Debian build log is here: https://buildd.debian.org/fetch.cgi?&pkg=haskell-curl&ver=1.3.5-2&arch=alph… I am correct to suspect that this is a bug in ghc rather than in haskell-curl? Any other useful clues or information? Cheers, Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/

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Re: Looking for a new HWN editor
by John Lato 08 Sep '09

08 Sep '09

I'd just like to say a big "Thank you" to Brent for his service as the HWN editor. I appreciate it very much and always look forward to HWN. Thanks for all your work, Brent. Cheers, John > > Message: 11 > Date: Sat, 5 Sep 2009 17:26:08 -0400 > From: Brent Yorgey <byorgey(a)seas.upenn.edu> > Subject: [Haskell-cafe] Looking for a new HWN editor > > Hi all, > > As you probably know, I've been the editor of the Haskell Weekly News > for a little over a year now, and I've decided that it's time for me > to move on to other things. So, I'm looking for someone to volunteer > to take over as HWN editor. > > -Brent

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How to use Template Haskell build Map?
by Andy Stewart 08 Sep '09

08 Sep '09

Hi all, I have below instances: instance PageViewState DiredViewState where instance PageViewState StringViewState where I can use Language.Haskell.Exts.Parser scan above instances got list: typeList :: [Type] typeList = [TyCon (UnQual (Ident "DiredViewState")),TyCon (UnQual (Ident "DiredViewState"))] So question is how to use Template Haskell and above `typeList` build below `Map` at compile-time? tagmap = M.fromList [(typeIdOf StringViewState, Exists (Dict :: PageViewStateDict StringViewState)) ,(typeIdOf DiredViewState, Exists (Dict :: PageViewStateDict DiredViewState))] Thanks! -- Andy

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How to generate the .chi file for c2hs?
by Magicloud Magiclouds 08 Sep '09

08 Sep '09

Hi, I want to make a binding of a gtk function, which returns a X11 type. gtk2hs is made by c2hs, which is OK to give me the .chi file. Well, X11 is not. So if I make my binding c2hs style, I have to make a .chi file for X11 myself. How to do it? -- 竹密岂妨流水过山高哪阻野云飞

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Re: [Haskell-cafe] ANNOUNCE: Palindromes 0.1
by Johan Jeuring 07 Sep '09

07 Sep '09

On 07 Sep 2009, at 21:21, Rafael Cunha de Almeida wrote: > Johan Jeuring wrote: >> Palindromes >> ============================================== >> >> Palindromes is a package for finding palindromes in files. >> >> Visit the homepage >> >> http://www.jeuring.net/Palindromes/ >> > > A few options are not working well: Thanks. Both errors have been corrected in version 0.1.1. And I moved it from category Algorithm to category Algorithms. -- Johan > $ ./palindromes --h > ********************* > * Palindrome Finder * > ********************* > palindromes: --h: openFile: does not exist (No such file or directory) > $ cat f > socorram-me subi no onibus em marrocos > $ ./palindromes -tl f > ********************* > * Palindrome Finder * > ********************* > Usage: > > palindrome [command-line-options] input-file > > The following options are available: > --h: This message > -p : Print the longest palindrome (default) > -ps: Print the longest palindrome around each position in the input > -l : Print the length of the longest palindrome > -ls: Print the length of the longest palindrome around each position > in the input > -t : Print the longest palindrome ignoring case, spacing and > punctuation > -tl: Print the length of the longest text palindrome > $ > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe(a)haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe

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haskelldb and Debian
by Joachim Breitner 07 Sep '09

07 Sep '09

Hi Haskell-DB-interested people, we are still on our way to get the Haskell coverage on Debian back in a good shape. One of the open issues is haskelldb, haskelldb-dynamic and haskelldb-hsql-*. All of these are on 0.10 [1] and do not build with ghc-6.10. It seems that at least haskelldb itself has a 0.12 which does build, but the others do not. Thus, some questions: * Are the haskelldb-hsql-* and haskelldb-dynamic packages still maintained? If so, is there a release expected soon? If not, we will have to remove these from Debian. * Without the hsql-* packages, the haskelldb package itself is useless, correct? So we need to package the hdbc series. Are these maintained actively? * Anything else to consider? Greetings, Joachim [1] http://packages.debian.org/search?suite=sid&arch=any&searchon=sourcenames&k… -- Joachim "nomeata" Breitner Debian Developer nomeata(a)debian.org | ICQ# 74513189 | GPG-Keyid: 4743206C JID: nomeata(a)joachim-breitner.de | http://people.debian.org/~nomeata

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Cabal install specific version of a package
by Grigory Sarnitskiy 07 Sep '09

07 Sep '09

How to install specific version of a package (derive 0.1.4)?

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Problem on existential type.
by Magicloud Magiclouds 07 Sep '09

07 Sep '09

Hi, I am trying out existential type, some sample code works well. Well, my own code could not be compiled with message: Grid.hs:45:11: Kind error: `GridWidget' is applied to too many type arguments In the type `GridWidget widget' In the type `(GridWidget widget) -> (widget -> t) -> t' In the type signature for `liftGW': liftGW :: (GridWidget widget) -> (widget -> t) -> t The code is: {-# OPTIONS -fglasgow-exts #-} module Grid where import Graphics.UI.Gtk data GridWidgetType = GridLabel | GridTextView data GridWidget = forall widget. (WidgetClass widget) => GridWidget widget --GWLabel Label -- | GWTextView TextView gridNew defaultWidget = do self <- fixedNew -- gw <- gridWidgetNew defaultWidget -- gridAddWidget self gw (0, 0) -- self `on` realize $ do -- (ww, wh) <- liftGW gw widgetGetSize -- (w, h) <- widgetGetSize self -- mapM_ (\x -> -- mapM_ (\y -> do -- gw <- gridWidgetNew defaultWidget -- liftGW gw $ \gw -> fixedPut self gw (x * ww, y * wh) -- ) [0..floor (h / wh)] -- ) [0..floor (w / ww)] return self -- gridSetWidget self (x, y) widget = do -- w <- gridGetWidget self (x, y) -- if w == widget -- then return () -- else do -- (w, h) <- widgetGetSize w -- gw <- gridWidgetNew widget -- fixedPut self gw (x * w, y * h) -- widgetDestroy w -- gridWidgetNew GridLabel = labelNew Nothing >>= return . GW -- gridWidgetNew GridTextView = textViewNew >>= return . GW -- gridAddWidget grid (GWLabel label) (x, y) = fixedPut grid label (x, y) -- gridAddWidget grid (GWTextView textView) (x, y) = fixedPut grid textView (x, y) liftGW :: (GridWidget widget) -> (widget -> t) -> t liftGW (GridWidget label) f = f label liftGW (GridWidget textView) f = f textView -- 竹密岂妨流水过山高哪阻野云飞

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How to Create Data Type of memory
by Akshay Dave 07 Sep '09

07 Sep '09

Hi All, I am stuck in converting the transition semantics in Haskell. Please let me know how to define memory data types in Haskell( like we define pointer in C). Prompt help would be greatly appreciated. Sincerely, Akshay _________________________________________________________________ Get back to school stuff for them and cashback for you. http://www.bing.com/cashback?form=MSHYCB&publ=WLHMTAG&crea=TEXT_MSHYCB_Back…

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"Conceptual Mathematics"
by Vasili I. Galchin 07 Sep '09

07 Sep '09

Hello, "Conceptual Mathematics" has been advertised as accessible to high school students. I would like to collect where this book is being taught to high school students and how it is taught(heuristics). I am interested in teaching it to students locally but I realize that these students to be very gifted. Any advice and especially real world experience would be appreciated. Thank you, Vasili

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