May 2009 - Haskell - Haskell.org

job announce
by Christophe Raffalli 03 May '09

03 May '09

Dear list members, I have a friend desperatly looking for a very good programmer ... I know him and his society and I am sure that a member of this list could have a lot of fun in his companie. Cheers, Christophe -------------------------------------- Attila système (http://www.attila-systeme.fr) innove depuis 2001 avec ses robots pour nettoyer les toitures qui ont obtenu la médaille d'or du concours Lépine en 2006 (http://www.attila-systeme.fr/historique) Avec maintenant 6 franchises en France et 3 projet d'ouverture d'ici à fin 2009. Attila fait preuve d'un grand dynamisme. Notre société recherche maintenant un informaticien capable d'accompagner ses recherches. Les besoins de la société sont variés et doivent permettre à un informaticien compétent et dynamique de s'épanouir. Le profil souhaité est donc celui de quelqu'un capable de comprendre les besoins d'Attila système et de ses partenaires, mais aussi capable d'autonomie et d'innovation afin d'accompagner le développement de la société. Dans un premier temps, il s'agira de : - Mettre en place le serveur et les applications clients assurant la liaison entre la maison mère et ses franchises. - Développer l'application servant à rédiger les devis à l'aide d'un "système expert". L'objectif ici est d'aider le technicien à obtenir à devis précis en temps réel chez le client à partir du plan de la toiture en 3D (obtenu à partir d'un logiciel existant). - Dans un l'avenir, toutes les idées innovantes sur le plan logiciel seront soutenues et encouragées. On envisage la généralisation du logiciel aux autres secteurs du bâtiment. Connaissances requises : - Connaître la programmation et être capable de développer un logiciel du début à la fin et d'apréhender rapidement les outils de l'informatique qui évoluent sans cesse. - Le logiciel existant est développé avec Windev (UML avec génération de code JAVA) et des bases de données mySQL sont envisagées. - Dans un premier temps, il faut aussi s'occuper de l'installation et de la maintenance des ordinateurs des franchises. Plus tard la société recrutera des techniciens et la personne que l'on cherche pourrait devenir responsable de la recherche et du développement de nos systèmes informatiques. - Les perspectives de salaire peuvent être très intéressantes en fonction des capacités du candidats (de 2000 euros brut pendant la période d'essai, puis rapidement jusqu'à 5000 euros voire plus si le candidat apporte un plus significatif à la société). - Zone géographique : le Loiret ou le Nord. Contact : Benoit LAHAYE tél: 0664213243 email: attilasysteme(a)attila-systeme.fr

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Haskell Weekly News: Issue 116 - May 2, 2009
by Brent Yorgey 02 May '09

02 May '09

--------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20090502 Issue 116 - May 02, 2009 --------------------------------------------------------------------------- Welcome to issue 116 of HWN, a newsletter covering developments in the [1]Haskell community. Announcements GHC 6.10.3 prerelease. Ian Lynagh [2]announced a [3]prerelease [4]version of GHC 6.10.3. There have been [5]very few changes relative to 6.10.2. Unless any major problems are uncovered, the final release is expected to be built in a couple of days. graphviz-2009.5.1. Ivan Lazar Miljenovic [6]announced version 2009.5.1 of the [7]graphviz library, which provides a Haskell interface to the [8]GraphViz program. Major changes include support for polyparse >= 1.1, dependency on GHC 6.10.*, functions from the [9]Graphalyze library, and more. priority-sync-0.1.0.1: Cooperative task prioritization.. Christopher Lane Hinson [10]announced the release of the [11]priority-sync package for cooperative task prioritization. HaL4: Local Haskell meeting, Halle/Saale, Germany, June 12. Henning Thielemann [12]requested proposals for talks for [13]HaL4, a local Haskell meeting in Halle, Germany on June 12. TraverseAccum: an effectful accumulating map.. Florent Balestrieri [14]posted some code implementing an effectful accumulating map. LondonHUG talk: Engineering Large Projects in Haskell. Don Stewart [15]posted [16]slides from last week's [17]London HUG talk, which attempts to document some of the tips and tricks Galois has accumulated using Haskell commercially for the past 10 years. atom-0.0.2. Tom Hawkins [18]announced the release of [19]atom, a Haskell DSL for designed hard realtime embedded programs. Eaton is using it to control hydraulic hybrid refuse trucks and shuttle buses. Bamse-0.9.4, a Windows Installer generator. Sigbjorn Finne [20]announced a new version of [21]Bamse, a package and application for letting you quickly put together Windows Installers for your software projects/products from within the comforts of Haskell. New in this release is the support for generating MSIs from your Cabal projects, having them either be built from source or just have them be installed and registered at install-time. Dutch Haskell Users' Group (first meeting: May 6th). Chris Eidhof [22]announced the first meeting of the newly formed [23]Dutch Haskell Users' Group (DHUG), on May 6th at 19:30 in Utrecht. Haskell Symposium Submission site now open. Stephanie Weirich [24]announced that [25]submission to the Haskell Symposium is now open. The submission deadline is May 8. OpenGL, GLUT, OpenAL, and ALUT updates. Sven Panne [26]announced [27]new [28]bugfix [29]releases for the [30]OpenGL, [31]GLUT, [32]OpenAL, and [33]ALUT packages. control-monad-exception-0.1: Explicitly typed exceptions. Pepe Iborra [34]announced the [35]control-monad-exception package, which provides explicitly typed exceptions for Haskell. The type of a computation in the EM monad carries a list of the exceptions that the computation may throw. A exception is raised with 'throw', which in addition adds it to the type, and captured with 'catch', which correspondingly removes it from the type. Only safe computations (all exceptions handled) can escape from the monad. Haskell File Manager. Michael Dever [36]announced the first release of [37]Haskell File Manager, a program for viewing/managing the files on your computer. It has all the common functionality you would expect from your current file manager, copying, moving, deleting, renaming, opening and searching. uu-parsinglib-2.0.0. S. Doaitse Swierstra [38]announced the release of [39]uu-parsinglib, the first version of the new parsing combinator library package from Utrecht University. Features include online result construction, much simpler internals than the combinators in the uulib package, error correction, parsing ambiguous grammars, a monadic interface, and more. Takusen 0.8.4. Alistair Bayley [40]announced version 0.8.4 of [41]Takusen, a database package; this is mostly a "get it working with ghc-6.10" release. Discussion Google SoC: Space profiling reloaded. Patai Gergely [42]asked for ideas on his Google Summer of Code project to [43]improve the Haskell space profiling experience. Blog noise [44]Haskell news from the [45]blogosphere. * Bryan O'Sullivan: [46]Slides from my Erlang Factory talk this morning. * Thomas Hartman: [47]What to do when cabal install works in one environment, but not another.. * Christopher Lane Hinson: [48]ANN: priority-sync. * Well-Typed.Com: [49]"Hello world" now only 11k using GHC with shared libs. * The GHC Team: [50]The new GHC build system is here!. * Well-Typed.Com: [51]First round of Industrial Haskell Group development work. * London Haskell Users Group: [52]Don's slides. * Galois, Inc: [53]Engineering Large Projects in Haskell: A Decade of FP at Galois. * JP Moresmau: [54]Haskell RPG Game uploaded on Hackage!. * Holumbus: [55]Distributed data structures. * Niklas Broberg: [56]GSoC09 => haskell-src-exts -> haskell-src. * >>> Remco Niemeijer: [57]Forcing evaluation in Haskell. * Chris Eidhof: [58]Building commercial Haskell applications. * >>> Lab49: [59]Differentiating Types in Haskell. Quotes of the Week * MonadState: Do not try to change the state; that's impossible. Instead only try to realize the truth: There is no state. * Baughn: Those who would give up essential laziness for a little ephemeral performance, deserve neither laziness nor performance. * Axman6: what's @flush do? saves stuff to dick? * bos: Crummy languages give static types a bad name. About the Haskell Weekly News New editions are posted to [60]the Haskell mailing list as well as to [61]the Haskell Sequence and [62]Planet Haskell. [63]RSS is also available, and headlines appear on [64]haskell.org. To help create new editions of this newsletter, please see the information on [65]how to contribute. Send stories to byorgey at cis dot upenn dot edu. The darcs repository is available at darcs get [66]http://code.haskell.org/~byorgey/code/hwn/ . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.glasgow.user/16852 3. http://www.haskell.org/ghc/dist/stable/dist/ghc-6.10.2.20090430-src.tar.bz2 4. http://www.haskell.org/ghc/dist/stable/dist/ghc-6.10.2.20090430-src-extrali… 5. http://www.haskell.org/ghc/dist/stable/docs/users_guide/release-6-10-3.html 6. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57826 7. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/graphviz 8. http://graphviz.org/ 9. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Graphalyze 10. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57776 11. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/priority-sync 12. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57764 13. http://www.iba-cg.de/hal4.html 14. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57730 15. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57719 16. http://www.galois.com/blog/2009/04/27/engineering-large-projects-in-haskell… 17. http://www.londonhug.net/ 18. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57676 19. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/atom 20. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57640 21. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bamse 22. http://article.gmane.org/gmane.comp.lang.haskell.general/17142 23. http://haskell.org/haskellwiki/Dutch_HUG 24. http://article.gmane.org/gmane.comp.lang.haskell.general/17140 25. http://www.easychair.org/conferences/?conf=haskell09 26. http://article.gmane.org/gmane.comp.lang.haskell.general/17132 27. http://article.gmane.org/gmane.comp.lang.haskell.general/17133 28. http://article.gmane.org/gmane.comp.lang.haskell.general/17134 29. http://article.gmane.org/gmane.comp.lang.haskell.general/17135 30. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/OpenGL 31. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/GLUT 32. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/OpenAL 33. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ALUT 34. http://article.gmane.org/gmane.comp.lang.haskell.general/17120 35. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/control%2Dmonad%… 36. http://www.haskell.org//pipermail/haskell/2009-April/021271.html 37. http://code.haskell.org/haskellfm 38. http://www.haskell.org//pipermail/haskell/2009-April/021284.html 39. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/uu%2Dparsinglib 40. http://www.haskell.org//pipermail/haskell/2009-May/021293.html 41. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Takusen 42. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/57810 43. http://socghop.appspot.com/student_project/show/google/gsoc2009/haskell/t12… 44. http://planet.haskell.org/ 45. http://haskell.org/haskellwiki/Blog_articles 46. http://www.serpentine.com/blog/2009/05/01/slides-from-my-erlang-factory-tal… 47. http://blog.patch-tag.com/2009/05/01/what-to-do-when-cabal-install-works-in… 48. http://blog.downstairspeople.org/2009/04/29/ann-priority-sync/ 49. http://blog.well-typed.com/2009/04/hello-world-now-only-11k-using-ghc-with-… 50. http://ghcmutterings.wordpress.com/2009/04/28/the-new-ghc-build-system-is-h… 51. http://blog.well-typed.com/2009/04/first-round-of-ihg-development-work/ 52. http://www.londonhug.net/2009/04/27/dons-slides/ 53. http://www.galois.com/blog/2009/04/27/engineering-large-projects-in-haskell… 54. http://jpmoresmau.blogspot.com/2009/04/haskell-rpg-game-uploaded-on-hackage… 55. http://holumbus.fh-wedel.de/blog/?p=22 56. http://nibrofun.blogspot.com/2009/04/gsoc09-haskell-src-exts-haskell-src.ht… 57. http://bonsaicode.wordpress.com/2009/04/27/forcing-evaluation-in-haskell/ 58. http://blog.tupil.com/building-commercial-haskell-applications/ 59. http://blog.lab49.com/archives/3027 60. http://www.haskell.org/mailman/listinfo/haskell 61. http://sequence.complete.org/ 62. http://planet.haskell.org/ 63. http://sequence.complete.org/node/feed 64. http://haskell.org/ 65. http://haskell.org/haskellwiki/HWN 66. http://code.haskell.org/~byorgey/code/hwn/

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ANNOUNCE: GLUT 2.1.2.1
by Sven Panne 02 May '09

02 May '09

A new version of the GLUT package has been uploaded to Hackage. This is a bug fix only release, containing only tiny changes: * Include missing aclocal.m4 and examples in source distribution * Removed unused Makefiles and prologue.txt Cheers, S.

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ANNOUNCE: OpenAL 1.3.1.3
by Sven Panne 02 May '09

02 May '09

A new version of the OpenAL package has been uploaded to Hackage. Again, this is a bug fix only release: * Include OpenAL header when checking values of constants * Include missing aclocal.m4 and examples in source distribution * Removed unused Makefiles and prologue.txt * Removed empty "demos" subdirectory * Fixed OpenAL URLs Hopefully this release will fix build issues on MacOS X and Windows. Thanks to Balazs Komuves for making me aware of these bugs, and providing a patch. Cheers, S.

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ANNOUNCE: ALUT 2.1.0.2
by Sven Panne 02 May '09

02 May '09

A new version of the ALUT package has been uploaded to Hackage. Again, this is a bug fix only release, containing only tiny changes: * Include missing aclocal.m4 and examples in source distribution * Removed unused Makefiles and prologue.txt * Fixed OpenAL URLs Cheers, S.

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ANN: Takusen 0.8.4
by Alistair Bayley 01 May '09

01 May '09

ANN: Takusen 0.8.4 This is mainly a "get it working with ghc-6.10" release. Changes since 0.8.3: - ODBC support: some bug fixes, and basic support for Out-parameters. There is at least one major outstanding bug with Out-parameters, where marshalling a String output bind-variable doesn't work correctly (if it was modified, you still get the String you passed in back, rather than the new String). - Sqlite: bug fix for resource leak: if a command (like rollback or commit) raised an error, the prepared-statement handle was not closed. - cabal: requires cabal 1.6 (or later). With ghc-6.6 on Windows you will need a later cabal than 1.6.0.1, as there is a bug which prevents building (setup configure fails with "setup: fdGetMode: invalid argument (Invalid argument)"). Eric Mertens patch for ODBC on OS x. Greg Leclerq patch for cabal 1.6. Thanks also to Austin Siepp and Brian Callendar for their patches. - ghc-6.10: will build with ghc's 6.10, 6.8, 6.6. Note that Takusen won't work with ghc-6.10.2 out-of-the-box, because the time package is missing. If you install time manually then it should be OK (but this is untested). We use the new extensible exceptions, but we have done so by including it within our own source tree. This will make it easier to use Takusen with older ghc's, and reduces the number of external package dependencies. We have dropped support for 6.4. That's not to say Takusen isn't usable with 6.4, just that we no longer test that configuration. The release bundle: http://hackage.haskell.org/packages/archive/Takusen/0.8.4/Takusen-0.8.4.tar… The latest code: darcs get http://darcs.haskell.org/takusen Docs: http://darcs.haskell.org/takusen/doc/html/index.html If you have cabal-install, then this command should work: cabal install Takusen --flags="sqlite odbc oracle postgres" ... but it doesn't (at least for the version of cabal-install that I have) because the .tar.gz file I uploaded has a bogus checksum. A comprehensive description of API usage can be found in the documentation for module Database.Enumerator (look for the Usage section): http://darcs.haskell.org/takusen/doc/html/Database-Enumerator.html Note that the haddock docs won't build with cabal-1.6.0.2 or earlier. This is because our literate-haskell source files need to be properly preprocessed before being passed to haddock. At the time of writing, you'll need the cabal HEAD to build the docs. Future plans: - Output bind-parameters and multiple-result sets for ODBC - support for Blobs and Clobs - FreeTDS backend (Sybase and MS Sql Server)... maybe For those of you unfamiliar with Takusen, here is our HCAR blurb: Takusen is a DBMS access library. Like HSQL and HDBC, we support arbitrary SQL statements (currently strings, extensible to anything that can be converted to a string). Takusen's 'unique-selling-point' is safety and efficiency. We statically ensure all acquired database resources - such as cursors, connection and statement handles - are released, exactly once, at predictable times. Takusen can avoid loading the whole result set in memory, and so can handle queries returning millions of rows in constant space. Takusen also supports automatic marshalling and unmarshalling of results and query parameters. These benefits come from the design of query result processing around a left-fold enumerator. Currently we fully support ODBC, Oracle, Sqlite, and PostgreSQL.

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ANN: Dutch Haskell Users' Group (first meeting: May 6th)
by Chris Eidhof 01 May '09

01 May '09

Dear Haskellers, During the last Haskell Hackathon a new user group was formed: the Dutch Haskell Users' Group (DHUG) [1]. We're happy to announce our first meeting on May 6th at 19:30 in Utrecht. We'll be talking about Haskell over drinks in The Stairway To Heaven [2], which is at walking distance from the Utrecht Central Station. Everybody's invited, from complete novices to advanced Haskell users. We hope to see you this Wednesday! -chris [1]: http://haskell.org/haskellwiki/Dutch_HUG [2]: http://www.stairway.nl/contact

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ANNOUNCE: graphviz-2009.5.1
by Ivan Lazar Miljenovic 01 May '09

01 May '09

I'd like to announce version 2009.5.1[1] of the graphviz[2] library, less than a week since Matthew Sackman passed maintainership onto me[3]. The graphviz library provides a Haskell interface to the GraphViz[4] program. [1] http://hackage.haskell.org/packages/archive/graphviz/2009.5.1/graphviz-2009… [2] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/graphviz [3] http://www.mail-archive.com/haskell@haskell.org/msg21994.html [4] http://graphviz.org Major changes with this release are: * Supports polyparse >= 1.1 (the previous version didn't work with 1.3). * Requires base == 4.* (i.e. GHC 6.10.*) due to the new exception handling. * Includes functions from my Graphalyze [5] library for actually running the various GraphViz commands, etc. * Slight API breakages: - dirCommand, undirCommand and commandFor no longer return String, but GraphvizCommand - Data.GraphViz.ParserCombinators is no longer exported by the Cabal file, since I see no need for anyone to require acccess to this. If this is a problem for you, please let me know and I'll re-export it. * A lot more Haddock documentation. * A darcs repository is now available [6]. Patches are welcome! [5] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Graphalyze [6] http://code.haskell.org/graphviz Plans for the future: * Add support for Data.Graph-style graphs (maybe even making it generic such that custom graph types can be used). * Allow the user to choose whether the graph is directed or undirected. * Include all attributes offered by the Dot language. * Remove (or at least minimise) usage of extensions to increase portability. Oh, and to pre-empt Don, this is already available in the Gentoo-Haskell overlay ;-) -- Ivan Lazar Miljenovic Ivan.Miljenovic(a)gmail.com IvanMiljenovic.wordpress.com

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