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July 2008

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Haskell Weekly News: Issue 75 - July 2, 2008
by Brent Yorgey 02 Jul '08

02 Jul '08

--------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20080702 Issue 75 - July 02, 2008 --------------------------------------------------------------------------- Welcome to issue 75 of HWN, a newsletter covering developments in the [1]Haskell community. Announcements Anglo Haskell 2008. Matthew Sackman [2]announced [3]AngloHaskell 2008, a gathering of all people Haskell-related from beginners, to seasoned hackers to academic giants. All and more are welcomed by large fuzzy green lambdas. The proposed dates and location are Friday the 8th and Saturday the 9th of August, at Imperial College, London. CFP - Special Issue of Fundamenta Informaticae on Dependently Typed Programming. Wouter Swierstra [4]announced a call for papers for a special issue of [5]Fundamenta Informaticae on [6]Dependently Typed Programming. The deadline for submissions is October 1. Gtk2Hs 0.9.13. Peter Gavin [7]announced the release of Gtk2Hs 0.9.13, including bindings for Gnome VFS and GStreamer, a new Gtk+ tutorial adapted by Hans van Thiel, cairo image stride support, and more. Hasim. Jochem Berndsen [8]announced Hasim, a [9]small project to create a library to do discrete event simulation in Haskell, using monads to define a domain-specific language for "actions" of a process. Galois move. Don Stewart [10]announced that Galois has completed the move of its data center. Expect speedier response times for hackage.haskell.org and darcs.haskell.org. Google Summer of Code Progress updates from participants in the 2008 [11]Google Summer of Code. Hoogle 4. Neil Mitchell (ndm) is working on [12]Hoogle 4. [13]This week, Neil worked on better Haddock database generation, lazy name searching, and a snazzy --info flag for Hoogle. Next up: type search! DPH physics engine. Roman Cheplyaka (Feuerbach) is working on a [14]physics engine using [15]Data Parallel Haskell. [16]This week, he worked on implementing Mirtich's V-Clip algorithm for collision detection (and [17]got it to work), cabalized his project and added documentation. He also ran into an interesting QuickCheck puzzle. Generic tries. Jamie Brandon is working on a library for efficient maps using generalized tries. [18]This week, he created a generic framework for automatically running QuickCheck tests at a number of different types. This week he plans to synthesize the many suggestions from the [19]discussion on the libraries list into a stable API design. Language.C. Benedikt Huber (visq) is [20]working on Language.C, a standalone parser/pretty printer library for C99. [21]This week he worked on a better representation for declarators, and abstracted the notion of an InputStream over both String and ByteString, among other accomplishments. GHC plugins. Max Bolingbroke is working on dynamically loaded plugins for GHC. Cabal dependency framework. Andrea Vezzosi (Saizan) is working on a [22]make-like dependency analysis framework for Cabal. GHC API. Thomas Schilling (nominolo) is working on [23]improvements to the GHC API. Officials at HWN headquarters have released a statement reversing their previous position regarding the existence of Thomas, citing regrettably faulty information to explain their previous misapprehensions. Expect to hear more from Thomas soon, now that he has finished graduating and moving. Libraries Proposals and extensions to the [24]standard libraries. GetOpt formatting improvements. Duncan Coutts [25]proposed some modifications to make the output of the System.Console.GetOpt library more readable, resulting in quite a bit of discussion. HughesPJ improvements. Benedikt Huber [26]proposed a patch with some bug fixes, performance improvements, and QuickCheck test suite for the Text.PrettyPrint.HughesPJ pretty-printing library. Discussion A Monad for on-demand file generation?. Joachim Breitner [27]asked about a monad for transparently tracking files which may need to be regenerated due to dependencies, leading to an interesting discussion of incremental computation, strict vs. lazy I/O, and other issues. New mailing list proposal: Haskell-Edu. Benjamin L. Russell sent out a message [28]proposing a new mailing list hosted at haskell.org, "Haskell-Edu: The Haskell Educational Mailing List." The new mailing list would be guided by the principle that Haskell is useful not just in research, but also in teaching programming as part of a liberal arts education. Comments and discussion welcomed. Learning GADT types to simulate dependent types. Paul Johnson is trying to use GADTs to simulate aspects of a dependently typed system, and [29]asks for help improving his Oleg rating. Call graph tool?. C.M.Brown [30]asked whether there is a tool for visualizing the call graph for a collection of source files, leading to a discussion of various tools. Jobs Formal methods and automated reasoning at Rockwell Collins. Janis Voigtlaender [31]passed on an opening for a Senior Systems Engineer at [32]Rockwell Collins. The opening is for a computer scientist or engineer to develop and apply automated analysis to computer systems and to pursue research in formal methods and automated reasoning. Contact: rmgatto at rockwellcollins.com. Blog noise [33]Haskell news from the [34]blogosphere. * Roman Cheplyaka: [35]V-Clip seems to work!. * Benedikt Huber: [36]Last week on Language.C (1). An update on Benedikt's Google Summer of Code project. * Jamie Brandon: [37]Week 3 progress. An update on Jamie's Google Summer of Code project. * Philip Wadler: [38]Welcome to Scotland, Neil, Patricia, and Conor!. * >>> codders: [39]Coding style, Haskell. codders likes how Real World Haskell gives some hints about Haskell coding style and culture in addition to teaching the language itself. * >>> zoo: [40]Haskell plug-in for Eclipse. zoo explains how to install the [41]Haskell Eclipse plugin. * Dan Piponi (sigfpe): [42]A blessed man's formula for holey containers. Dan descries an enlightening derivation of the [43]combinatorial form of Faa di Bruno's formula from the perspective of derivatives of types. * Roman Cheplyaka: [44]Status report: week 5. An update on Roman's Google Summer of Code project. * >>> codders: [45]More Haskell fun. * >>> Marco Tulio Gontijo e Silva: [46]Rank 2 Types. Marco describes a practical use for GHC's rank-2 types. * Edward Kmett: [47]Memoizing Context. * >>> JP Moresmau: [48]Deserializing JSON to Haskell Data objects. * >>> codders: [49]Getting started with Haskell... still. codders is learning Haskell by reading the beta version of [50]Real World Haskell. * Neil Mitchell: [51]GSoC Hoogle: Week 5. * Arnar: [52]Parsing JSON with Haskell. A nice example of using [53]Parsec to parse JSON. * Thomas Hartman: [54]HAppS Tutorial. Quotes of the Week * quicksilver: [on what OS sjanssen uses] sjanssen runs haskell programs in his head; much more efficient. * EvilTerran: "We were somewhere around Barstow, on the edge of the desert, when the phantom types began to take hold." * audreyt: o/~ the phantom of the typesystem is here / inside my mind! o/~ * dmwit: No, no, no, ($) isn't right-assoc, it's wrong-assoc. * solrize: this would never happen in haskell: i sent in a search query to a certain python program, but left the query field empty, expecting to get back an error message. instead it found a bunch of books written by the diet doctor Gary Null. * heatsink: We're all inside do-blocks in the IO monad if you think about it. * djsiegel: [upon having a question answered by dons] oh my, I'm talking to the man * mar77a: the first computers were big because they were actually cupboards with fast humans inside About the Haskell Weekly News New editions are posted to [55]the Haskell mailing list as well as to [56]the Haskell Sequence and [57]Planet Haskell. [58]RSS is also available, and headlines appear on [59]haskell.org. Headlines are available as [60]PDF. To help create new editions of this newsletter, please see the information on [61]how to contribute. Send stories to byorgey at seas dot upenn dot edu. The darcs repository is available at darcs get [62]http://code.haskell.org/~byorgey/code/hwn/ . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.general/16272 3. http://www.haskell.org/haskellwiki/AngloHaskell/2008 4. http://article.gmane.org/gmane.comp.lang.haskell.general/16269 5. http://fi.mimuw.edu.pl/ 6. http://sneezy.cs.nott.ac.uk/darcs/DTP08/journal.html 7. http://www.haskell.org//pipermail/haskell-cafe/2008-June/044805.html 8. http://article.gmane.org/gmane.comp.lang.haskell.cafe/41881 9. http://huygens.functor.nl/hasim 10. http://article.gmane.org/gmane.comp.lang.haskell.cafe/41847 11. http://hackage.haskell.org/trac/summer-of-code/wiki/SoC2008 12. http://code.haskell.org/hoogle/ 13. http://neilmitchell.blogspot.com/2008/06/gsoc-hoogle-week-5.html 14. http://haskell.org/haskellwiki/Hpysics 15. http://www.haskell.org/haskellwiki/GHC/Data_Parallel_Haskell 16. http://physics-dph.blogspot.com/2008/06/status-report-week-5.html 17. http://physics-dph.blogspot.com/2008/07/v-clip-seems-to-work.html 18. http://jamiiecb.blogspot.com/2008/06/week-3-progress.html 19. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/9259 20. http://www.sivity.net/projects/language.c/wiki/ 21. http://hsbene.blogspot.com/2008/07/last-week-on-languagec-1.html 22. http://code.haskell.org/~Saizan/cabal 23. http://hackage.haskell.org/trac/ghc/wiki/GhcApiStatus 24. http://haskell.org/haskellwiki/Library_submissions 25. http://article.gmane.org/gmane.comp.lang.haskell.libraries/9415 26. http://article.gmane.org/gmane.comp.lang.haskell.libraries/9377 27. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/41868 28. http://thread.gmane.org/gmane.comp.lang.haskell.general/16271 29. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/41848 30. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/41786 31. http://article.gmane.org/gmane.comp.lang.haskell.general/16266 32. http://www.rockwellcollins.com/ 33. http://planet.haskell.org/ 34. http://haskell.org/haskellwiki/Blog_articles 35. http://physics-dph.blogspot.com/2008/07/v-clip-seems-to-work.html 36. http://hsbene.blogspot.com/2008/07/last-week-on-languagec-1.html 37. http://jamiiecb.blogspot.com/2008/06/week-3-progress.html 38. http://wadler.blogspot.com/2008/06/welcome-to-scotland-neil-patricia-and.ht… 39. http://talkingcode.co.uk/2008/06/30/coding-style-haskell/ 40. http://imonad.com/blog/2008/06/haskell-plug-in-for-eclipse/ 41. http://sourceforge.net/projects/eclipsefp/ 42. http://sigfpe.blogspot.com/2008/06/blessed-mans-formula-for-holey.html 43. http://en.wikipedia.org/wiki/Fa%C3%A0_di_Bruno's_formula#Combinatorial_form 44. http://physics-dph.blogspot.com/2008/06/status-report-week-5.html 45. http://talkingcode.co.uk/2008/06/28/more-haskell-fun/ 46. http://marcotmarcot.blogspot.com/2008/06/rank-2-types.html 47. http://comonad.com/reader/2008/memoizing-context/ 48. http://jpmoresmau.blogspot.com/2008/06/deserializing-json-to-haskell-data.h… 49. http://talkingcode.co.uk/2008/06/27/getting-started-with-haskell-still/ 50. http://www.realworldhaskell.org/ 51. http://neilmitchell.blogspot.com/2008/06/gsoc-hoogle-week-5.html 52. http://www.hvergi.net/2008/06/parsing-json-with-haskell/ 53. http://legacy.cs.uu.nl/daan/parsec.html 54. http://ramblings.tumblr.com/post/39794244/happs-tutorial 55. http://www.haskell.org/mailman/listinfo/haskell 56. http://sequence.complete.org/ 57. http://planet.haskell.org/ 58. http://sequence.complete.org/node/feed 59. http://haskell.org/ 60. http://code.haskell.org/~byorgey/code/hwn/archives/20080702.pdf 61. http://haskell.org/haskellwiki/HWN 62. http://code.haskell.org/~byorgey/code/hwn/

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