June 2009 - Haskell-Cafe

Re: [Haskell-cafe] [cabal] How to deal with build-depency that not under cabal's control?
by Roman Cheplyaka 14 Jun '09

14 Jun '09

* Magicloud Magiclouds <magicloud.magiclouds(a)gmail.com> [2009-06-14 18:48:26+0800] > My gtk2hs is install manually, `configure && make && make install`. So It's okay. > when I add gtk to build-dependency, it tells me > Setup.hs: At least the following dependencies are missing: > gtk -any Installation of gtk2hs registers these packages for you. Again, check `ghc-pkg list gtk`. If you installed gtk2hs, it must be there. If you, say, upgraded your ghc after you installed gtk2hs, you have to reinstall gtk2hs. > How to register my manual-installed gtk2hs to cabal? > > On Sun, Jun 14, 2009 at 6:25 PM, Roman Cheplyaka<roma(a)ro-che.info> wrote: > > * Magicloud Magiclouds <magicloud.magiclouds(a)gmail.com> [2009-06-14 17:30:33+0800] > >> Hi, > >> I use gtk2hs in linux. Well, I have no idea how to install gtk2hs by > >> cabal, but my program needs it, and I want my program cabalized. So > >> how to do this? > >> Thanks. > > > > gtk2hs consists of several cabal packages, e.g. gtk, glib and so on. > > (See `ghc-pkg list`) > > Specify those of them you need as dependencies in cabal file. > > > > -- > > Roman I. Cheplyaka :: http://ro-che.info/ > > "Don't let school get in the way of your education." - Mark Twain > > _______________________________________________ > > Haskell-Cafe mailing list > > Haskell-Cafe(a)haskell.org > > http://www.haskell.org/mailman/listinfo/haskell-cafe > > > > > > -- > 竹密岂妨流水过 > 山高哪阻野云飞 -- Roman I. Cheplyaka :: http://ro-che.info/ "Don't let school get in the way of your education." - Mark Twain

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[cabal] How to deal with build-depency that not under cabal's control?
by Magicloud Magiclouds 14 Jun '09

14 Jun '09

Hi, I use gtk2hs in linux. Well, I have no idea how to install gtk2hs by cabal, but my program needs it, and I want my program cabalized. So how to do this? Thanks. -- 竹密岂妨流水过山高哪阻野云飞

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install problems ...
by Vasili I. Galchin 14 Jun '09

14 Jun '09

Hello, As I have said before I a, "cabalizing" Swish (a semantic web toolkit). I have it built and have run most of the original author's tests by and they pass. There are numerous warnings which seem to be either lack of a function type signature or "unreferenced" symbols ... I will go through one-by-one and clean these up. However, now I am getting the following install-time errors .... any advice on how to track down will be greatly apprecriated .... the following is the result of "cabal build -v": Preprocessing executables for swish-0.2.1... Building swish-0.2.1... /usr/bin/ar: creating dist/build/libHSswish-0.2.1.a Warning: output was redirected with -o, but no output will be generated because there is no Main module. Installing: /home/vigalchin/.cabal/lib/swish-0.2.1/ghc-6.8.2 Installing: /home/vigalchin/.cabal/bin cabal: Error: some packages failed to install: swish-0.2.1 failed during the final install step. The exception was: dist/build/N3Parser/N3Parser: copyFile: does not exist (No such file or directory) vigalchin@ubuntu:~/FTP/Haskell/Swish-0.2.1$ Regards, Vasili

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HSH and IO ()
by Dimitry Golubovsky 14 Jun '09

14 Jun '09

John & all, I use HSH in my project where several external programs and Haskell functions need to be piped together: HSH is of great help here. I however came across the situation when one of pipe-connected functions has signature IO (), yet it reads from stdin* and writes to stdout. The documentation mentions "instance ShellCommand (Handle -> Handle -> IO ())" which could be of some help, but in the latest version of HSH on Hackage this instance is commented out. What was the reason of doing that? Is this to be expected in the upcoming versions? Thank you. ---------------------------- * I modelled that by calling getContents, but the actual program will call a foreign library that contains a C function that reads from stdin (that is, FILE *), and that cannot be changed easily. -- Dimitry Golubovsky Anywhere on the Web

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ANN: hledger 0.6 released
by Simon Michael 13 Jun '09

13 Jun '09

I'm pleased to announce the release of hledger 0.6. For docs, online demo etc., see http://hledger.org . Some pre-built binaries are now available at http://hledger.org/ binaries . Or, install with: cabal install hledger [-fhapps] [-fvty]. (Using the latest Haskell Platform, "cabal install hledger -fhapps" works on gnu/ linux, mac and windows. Hurrah!) I'd like to hear feedback, especially if you hit trouble getting started. Happy tracking! - Simon (sm) 2009/06/13 hledger 0.6 ...................... * now cabal-installable on unix, mac, and windows, with Haskell Platform * provide experimental platform binaries * parsing: fix a silly failure to open ledger file paths containing ~ * parsing: show better errors for unbalanced transaction and missing default year * parsing: allow parentheses and brackets inside account names, as ledger does * parsing: fail on empty account name components, don't just ignore * add: description passed as arguments now affects first transaction only * add: better handling of virtual postings and default amounts * print, register: show virtual accounts bracketed/parenthesised * web: improved web ui supporting full patterns & period expressions * new "stats" command reports some ledger statistics * many dev/doc/deployment infrastructure improvements * move website into darcs repo, update home page * move issue tracker to google code Release stats: * Contributors: Simon Michael * Days since last release: 21 * Commits: 94 * Lines of non-test code: 2865 * Tests: 82 * Test coverage: 53% expressions * Known errors: 3 (inconsistent eliding, vty-related failures) * Performance: similar (http://hledger.org/profs/200906131120.bench)

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Haskell Weekly News: Issue 121 - June 13, 2009
by Brent Yorgey 13 Jun '09

13 Jun '09

--------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20090613 Issue 121 - June 13, 2009 --------------------------------------------------------------------------- Welcome to issue 121 of HWN, a newsletter covering developments in the [1]Haskell community. Announcements purely functional lazy non-deterministic programming. Sebastian Fischer [2]announced the [3]explicit-sharing library, which supports lazy functional-logic programming in Haskell. nntp 0.0.1. Maciej Piechotka [4]announced the release of [5]nntp, a library to connect to nntp (i.e. mainly USENET) servers. OpenGLRaw 1.0.0.0. Sven Panne [6]announced the release of [7]OpenGLRaw, a low-level binding for OpenGL. The eventual goal is to make the OpenGL package easier to install, more modular and a bit more flexible. pgm-0.1 on Hackage. Frederick Ross [8]announced [9]pgm, a pure Haskell library to read and write PGM images. It seamlessly handles the divide between 1 and 2 byte per pixel images; reads and writes UArrays; can handle multiple PGMs concatenated one after another in a file; and encodes and decodes all comments in the PGM header, which can be used to drop arbitrary metadata into files in a human readable manner. iteratee-0.2.1 released. John Lato [10]announced the release of [11]iteratee-0.2.1, a major update to the iteratee library. This library provides types and functions for performing enumerator/iteratee based I/O operations in Haskell, as [12]described by Oleg. The new version is a large redesign, including support for resumable exceptions and a greatly simplified interface. testrunner-0.9. Reinier Lamers [13]announced [14]testrunner, a new framework for running unit test. It can run unit tests in parallel; can run QuickCheck and HUnit tests as well as simple boolean expressions; and comes with a ready-made main function for your unit test executable. serial-0.2. Frederick Ross [15]announced version 0.2 of [16]serial, a library for working with line-oriented POSIX serial ports. hunp-0.0. Deniz Dogan [17]announced [18]hunp, a command-line utility which automagically calls the right "unpacker" program for you and works on both files and directories. Nemesis : easy task management. Jinjing Wang [19]announced a new release of [20]nemesis, a simple rake-like task management tool. Data.Reify.CSE. Sebastiaan Visser [21]announced the [22]data-reify-cse module, which implements common sub-expression elimination for graphs generated by the Data.Reify package. This package might especially be useful for optimizing simple compilers for referentially transparent domain specific languages. Hac phi accommodation: register by June 15 for reduced rate! Brent Yorgey [23]reminded anyone interested in attending [24]Hac phi that Monday 15 June is the deadline for getting a special reduced hotel rate. alloy-1.0.0 (generic programming). Neil Brown [25]announced the [26]first release of the [27]Allow generic programming library. It is intended to be a fairly fast blend of several other generics approaches, such as SYB (but without the dynamic typing) and Uniplate (but allowing an arbitrary number of target types), for performing transformations on specific types in large tree structures. StrictBench 0.1 - Benchmarking code through strict evaluation. R.A. Niemeijer [28]announced the release of [29]StrictBench, a library for timing full evaluation of values. haskeem 0.7.0 uploaded to hackage. Uwe Hollerbach [30]announced [31]haskeem, a small scheme interpreter written in Haskell. numtype 1.0 -- Type-level (low cardinality) integers. Bjorn Buckwalter [32]announced the [33]Numeric.NumType module, now released as its own package, which implements a unary type-level representation of integers, supporting addition, subtraction, multiplication, and division. Google Summer of Code Progress updates from participants in the 2008 [34]Google Summer of Code. space profiling. Gergely Patai has some [35]pretty graphs generated by his profiling library. haskell-src-exts. Niklas Broberg is [36]quite close to releasing haskell-src-exts 1.0.0, as soon as he has full and correct support for (almost) everything code-related, with only a few things left to do. He also wrote [37]a post explaining the intricacies of parsing code containing the 'forall' keyword (well, whether it is a keyword depends on which extensions are enabled...) fast darcs. Petr Rockai made a bit less progress this week, with finals and other things interfering, but [38]made some progress on some documentation, tracking down a performance regression, and other things. Discussion Adding an ignore function to Control.Monad. Gwern Branwen [39]proposed adding an 'ignore' function to Control.Monad which explicitly changes an m a into a m (). Bikeshedding (and some useful discussion) ensued. Wiki user accounts. Philippa Cowderoy began a [40]discussion of what to do about the current situation with wiki user accounts (namely, that account creation is disabled due to spam, and the one maintainer of the wiki can't always respond to account creation requests instantly). Lightweight type-level dependent programming in Haskell. Ryan Ingram made an interesting [41]post about implementing lightweight closed type classes in Haskell. who's up for a hackathon? (ICFP, late Aug, early Sept). Eric Kow [42]wanted to know who would be interested in having a hackathon immediately before or after ICFP in Edinburgh. Jobs Galois is hiring functional programmers. Don Stewart [43]announced that [44]Galois is hiring! See the announcement for more details. Blog noise [45]Haskell news from the [46]blogosphere. Blog posts from people new to the Haskell community are marked with >>>, be sure to welcome them! * Niklas Broberg: [47]GSoC status report, week 3. * Joachim Breitner: [48]Introducing L-seed. * Conal Elliott: [49]Memoizing polymorphic functions - part two. * London Haskell Users Group: [50]Next Meeting: Sean Leather, Fun and generic things to do with EMGM. * David Amos: [51]It's on Hackage!. Haskell for Maths is now just a cabal-install away. * Michael Snoyman: [52]Filename encoding issues. * David Amos: [53]Permutation groups. * Edward Kmett: [54]Recursion Schemes: A Field Guide (Redux). * mightybyte: [55]Intro to HAppS-State. * Conal Elliott: [56]Memoizing polymorphic functions - part one. * Lennart Augustsson: [57]More LLVM. * Roman Cheplyaka: [58]Don't play with your monads. * Galois, Inc: [59]Tech Talk: Orc in Haskell. * Petr Rockai: [60]soc progress 3. Progress on Petr's GSoC darcs project. * Magnus Therning: [61]Using msmtp with darcs. * Erik de Castro Lopo: [62]Debian Maintainer. Erik is now a Debian maintainer, and plans to give Haskell on Debian a much-needed facelift! * Niklas Broberg: [63]What's in a forall?. More Haskell parsing fun. * Well-Typed.Com: [64]GHC, primops and exorcising GMP. * Niklas Broberg: [65]What's in a forall?. More than you might expect! * >>> Zsol: [66]Visualizing the graphrewrite process behind Haskell. Work on the [67]visual-graphrewrite package. * Eric Kow (kowey): [68]testrunner for practical quickcheck. * Sebastian Fischer: [69]Explicit sharing of monadic effects. Purely functional, lazy, non-deterministic programming! * LHC Team: [70]New backend. * >>> James McNeill: [71]Messing with Haskell. * Dan Piponi (sigfpe): [72]Hashing Molecules. * Shin-Cheng Mu: [73]Longest Segment Satisfying Suffix and Overlap-Closed Predicates. * David Amos: [74]Simple graphs with Math.Combinatorics.Graph. David shows off his Haskell for Maths library. * Gergely Patai: [75]More colourful graphs. Graphs from Gergely's GSoC project on profiling. * Bryan O'Sullivan: [76]Case conversion and text 0.3. The text module gets solid, standards-compliant case conversion. * Bjorn Buckwalter: [77]numtype 1.0: Type-level (low cardinality) integers. * >>> Jörn Dinkla: [78]Parallelization with Haskell - Easy as can be. Quotes of the Week * sjanssen: in our sub-culture, "considered harmful" means "burn it with fire" * quicksilver: after all, anyone who insists on talking about himself in the third person is clearly someone to be reckoned with. About the Haskell Weekly News New editions are posted to [79]the Haskell mailing list as well as to [80]the Haskell Sequence and [81]Planet Haskell. [82]RSS is also available, and headlines appear on [83]haskell.org. To help create new editions of this newsletter, please see the information on [84]how to contribute. Send stories to byorgey at cis dot upenn dot edu. The darcs repository is available at darcs get [85]http://code.haskell.org/~byorgey/code/hwn/ . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.libraries/11265 3. http://sebfisch.github.com/explicit-sharing 4. http://article.gmane.org/gmane.comp.lang.haskell.general/17271 5. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/nntp 6. http://www.haskell.org//pipermail/haskell/2009-June/021402.html 7. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/OpenGLRaw 8. http://article.gmane.org/gmane.comp.lang.haskell.general/17263 9. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/pgm 10. http://article.gmane.org/gmane.comp.lang.haskell.general/17262 11. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/iteratee 12. http://okmij.org/ftp/Streams.html#iteratee 13. http://article.gmane.org/gmane.comp.lang.haskell.general/17258 14. http://projects.haskell.org/testrunner/ 15. http://article.gmane.org/gmane.comp.lang.haskell.general/17257 16. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/serial 17. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59843 18. http://hackage.haskell.org/package/hunp 19. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59824 20. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/nemesis 21. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59807 22. http://hackage.haskell.org/package/data-reify-cse 23. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59741 24. http://haskell.org/haskellwiki/Hac_%CF%86 25. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59631 26. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/alloy 27. http://twistedsquare.com/Alloy-Tutorial.pdf 28. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59605 29. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/StrictBench 30. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59551 31. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/haskeem 32. http://article.gmane.org/gmane.comp.lang.haskell.cafe/59543 33. http://dimensional.googlecode.com/ 34. http://hackage.haskell.org/trac/summer-of-code/wiki/SoC2008 35. http://just-bottom.blogspot.com/2009/06/more-colourful-graphs.html 36. http://nibrofun.blogspot.com/2009/06/gsoc-status-report-week-3.html 37. http://nibrofun.blogspot.com/2009/06/whats-in-forall.html 38. http://web.mornfall.net/blog/soc_progress_3.html 39. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/11278 40. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/59814 41. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/59749 42. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/59737 43. http://article.gmane.org/gmane.comp.lang.haskell.general/17264 44. http://www.galois.com/ 45. http://planet.haskell.org/ 46. http://haskell.org/haskellwiki/Blog_articles 47. http://nibrofun.blogspot.com/2009/06/gsoc-status-report-week-3.html 48. https://www.joachim-breitner.de/blog/archives/330-Introducing-L-seed.html 49. http://conal.net/blog/posts/memoizing-polymorphic-functions-part-two/ 50. http://www.londonhug.net/2009/06/12/next-meeting-sean-leather-fun-and-gener… 51. http://haskellformaths.blogspot.com/2009/06/its-on-hackage.html 52. http://blog.snoyman.com/2009/06/11/filename-encoding-issues/ 53. http://haskellformaths.blogspot.com/2009/06/permutation-groups.html 54. http://comonad.com/reader/2009/recursion-schemes/ 55. http://softwaresimply.blogspot.com/2008/02/intro-to-happs-state.html 56. http://conal.net/blog/posts/memoizing-polymorphic-functions-part-one/ 57. http://augustss.blogspot.com/2009/06/more-llvm-recently-someone-asked-me-on… 58. http://ro-che.blogspot.com/2009/06/dont-play-with-your-monads.html 59. http://www.galois.com/blog/2009/06/09/tech-talk-orc/ 60. http://web.mornfall.net/blog/soc_progress_3.html 61. http://therning.org/magnus/archives/656 62. http://www.mega-nerd.com/erikd/Blog/CodeHacking/Debian/debian_maintainer.ht… 63. http://nibrofun.blogspot.com/2009/06/whats-in-forall.html 64. http://blog.well-typed.com/2009/06/ghc-primops-and-exorcising-gmp/ 65. http://nibrofun.blogspot.com/2009/06/whats-in-forall.html 66. http://lazybottom.blogspot.com/2009/06/visualizing-graphrewrite-process-beh… 67. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/visual-graphrewr… 68. http://koweycode.blogspot.com/2009/06/testrunner-for-practical-quickcheck.h… 69. http://www-ps.informatik.uni-kiel.de/~sebf/haskell/explicit-sharing.html 70. http://lhc-compiler.blogspot.com/2009/06/new-backend.html 71. http://playtechs.blogspot.com/2009/06/messing-with-haskell.html 72. http://blog.sigfpe.com/2009/06/hashing-molecules.html 73. http://www.iis.sinica.edu.tw/~scm/2009/longest-segment-satisfying-suffix-an… 74. http://haskellformaths.blogspot.com/2009/06/simple-graphs-with-mathcombinat… 75. http://just-bottom.blogspot.com/2009/06/more-colourful-graphs.html 76. http://www.serpentine.com/blog/2009/06/07/case-conversion-and-text-03/ 77. http://flygdynamikern.blogspot.com/2009/06/announce-numtype-10-type-level-l… 78. http://blog.dinkla.net/?p=15 79. http://www.haskell.org/mailman/listinfo/haskell 80. http://sequence.complete.org/ 81. http://planet.haskell.org/ 82. http://sequence.complete.org/node/feed 83. http://haskell.org/ 84. http://haskell.org/haskellwiki/HWN 85. http://code.haskell.org/~byorgey/code/hwn/

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ANNOUNCE: hunp-0.0
by Deniz Dogan 13 Jun '09

13 Jun '09

Inspired by the CLI utility "unp", which was nice but lacked some DWIM functionality, I developed hunp (or hünp, but pronounced hump because it's easier). It automagically calls the right "unpacker" program for you and works on both files and directories: $ hunp ~/download/something/ ...finds ~/download/something/hello.r00 and calls "unrar x ~/download/something/hello.r00". $ hunp ~/howdy.tar.gz ...calls "tar zxvf ~/howdy.tar.gz" Get it from http://hackage.haskell.org/package/hunp or from git://github.com/skorpan/hunp.git Enjoy! -- Deniz Dogan PS. I was unable to find the thread on how to properly announce things on the mailing lists, so I hope everyone is okay with this going only to Haskell café.

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Check out my photos on Facebook
by Rakesh Malik 13 Jun '09

13 Jun '09

Hi haskell-cafe(a)haskell.org, I set up a Facebook profile where I can post my pictures, videos and events and I want to add you as a friend so you can see it. First, you need to join Facebook! Once you join, you can also create your own profile. Thanks, Rakesh To sign up for Facebook, follow the link below: http://www.facebook.com/p.php?i=898160075&k=Z5E62YTRPW2CUGGAX144X3&r haskell-cafe(a)haskell.org was invited to join Facebook by Rakesh Malik. If you do not wish to receive this type of email from Facebook in the future, please click on the link below to unsubscribe. http://www.facebook.com/o.php?k=917e28&u=531922198&mid=9dcc69G1fb47d16G0G8 Facebook's offices are located at 1601 S. California Ave., Palo Alto, CA 94304.

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Haskell Meetup groups in Glasgow
by A Smith 13 Jun '09

13 Jun '09

Do any Haskell Meetup groups exist in or around Glasgow, an informal get-to-gether in a pub,cafe or wherever ? I'm in Edinburgh, and on my own have been desperately trying to rewire my brain from Perl to Haskell without much success for most of this year. I posted the meetup group question a few weeks ago for Edinburgh but got no response. -- Andrew

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Atom - help.
by Radamés Ajna 13 Jun '09

13 Jun '09

hi there, I've been working with haskell and atom dsl, however I'm new to haskell.. John Van Enk inspired me with programming arduino->atmegas , with haskell, So here is my problem. With an action , action :: ([String] -> String) -> [UE] -> Atom () , it's possible make calls to some precoded C functions like, setLED v = action (\[x] -> "setLED(" ++ x ++ ")") [v'] where v' = ue . value $ v where setLed is a precode function. I want call a precoded C function that returns some value, but action always give me Atom () , that's I would like to do but I don't know how .. Atom (V Int8) < ---- "int read()" thanks... related links http://hackage.haskell.org/package/atom-0.0.5 http://blog.sw17ch.com/wordpress/?p=111 http://leepike.wordpress.com/2009/05/05/an-atomic-fibonacci-server-explorin… Radamés

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