--------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20070312 Issue 59 - March 12, 2007 --------------------------------------------------------------------------- Welcome to issue 59 of HWN, a weekly newsletter covering developments in the [1]Haskell community. This week we see the 2007 Haskell Workshop announcement, Haskell.org's participation in the Google Summer of Code gets underway, and of course, new libraries! 1. http://haskell.org/ Announcements Google Summer of Code and Haskell.org. Malcolm Wallace [2]announced that Haskell.org has once again applied to be a mentoring organisation for the Google Summer of Code. If you are a student who would like to earn money hacking in Haskell, or you are a non-student who has a cool idea for a coding project but no time to do it yourself, then visit the [3]SoC wiki to gather ideas, and add yourself to the list of interested people! Add new ideas for projects! 2. http://article.gmane.org/gmane.comp.lang.haskell.cafe/20232 3. http://hackage.haskell.org/trac/summer-of-code Haskell Workshop Call for Papers. Gabriele Keller [4]announced the initial call for papers for the Haskell Workshop 2007, part of the 2007 International Conference on Functional Programming (ICFP). The purpose of the Haskell Workshop is to discuss experience with Haskell, and possible future developments for the language. The scope of the workshop includes all aspects of the design, semantics, theory, application, implementation, and teaching of Haskell. 4. http://article.gmane.org/gmane.comp.lang.haskell.general/14977 Data.CompactString 0.3: Unicode ByteString. Twan van Laarhoven [5]announced version 0.3 of the Data.CompactString library. Data.CompactString is a wrapper around Data.ByteString supporting Unicode strings. 5. http://article.gmane.org/gmane.comp.lang.haskell.general/14973 harchive-0.2: backup and restore software in Haskell. David Brown [6]announced release 0.2 of [7]harchive, a program for backing up and restoring data. The package is available [8]from Hackage. 6. http://article.gmane.org/gmane.comp.lang.haskell.general/14972 7. http://www.davidb.org/darcs/harchive/ 8. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/harchive-0.2 New release of regex packages. Chris Kuklewicz [9]announced new versions of the regex-* packages (base,compat,dfa,parsec,pcre,posix,tdfa,tre). There is a new [10]wiki page with documentation relating to these packages. All packages are available from [11]Hackage, under the [12]Text Category. 9. http://article.gmane.org/gmane.comp.lang.haskell.cafe/20189 10. http://haskell.org/haskellwiki/Regular_expressions 11. http://hackage.haskell.org/packages/hackage.html 12. http://hackage.haskell.org/packages/archive/pkg-list.html#cat:Text StaticDTD: type safe markup combinators from DTDs. Marcel Manthe [13]announced a tool that transforms a Document Type Definition to a library. The resulting library contains combinators that assure proper nesting of elements. The plan is to add more constraints that will also take care of the order of occurrence of children. The parsing of the DTD is done with HaXml. The code is [14]available via darcs. 13. http://article.gmane.org/gmane.comp.lang.haskell.cafe/20218 14. http://m13s07.vlinux.de/darcs/StaticDTD/ IPv6 support for network package. Bryan O'Sullivan [15]announced that he'd added IPv6 support to the network package. 15. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6363 Type-level binary arithmetic library. Oleg Kiselyov and Chung-chieh Shan [16]announced a [17]new library for arbitrary precision binary arithmetic over natural kinds. The library supports addition/subtraction, predecessor/successor, multiplication/division, exp2, full comparisons, GCD, and the maximum. At the core of the library are multi-mode ternary relations Add and Mul where any two arguments determine the third. Such relations are especially suitable for specifying static arithmetic constraints on computations. The type-level numerals have no run-time representation; correspondingly, all arithmetic operations are done at compile time and have no effect on run-time. 16. http://article.gmane.org/gmane.comp.lang.haskell.general/14961 17. http://pobox.com/~oleg/ftp/Computation/resource-aware-prog/BinaryNumber.hs Haskell' This section covers the [18]Haskell' standardisation process. * [19]Deriving Functor 18. http://hackage.haskell.org/trac/haskell-prime 19. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2135 Libraries This week's proposals and extensions to the [20]standard libraries. * [21]Add IPv6 support to network library * [22]Error handling conventions 20. http://haskell.org/haskellwiki/Library_submissions 21. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6377 22. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6382 Discussion Avoiding intermediate data structures. David Roundy [23]opened discussion on techniques for avoiding intermediate data structures in Haskell code 23. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/20319 Maybe a different Maybe. Joachim Breitner [24]wondered about avoiding intermediate Maybe constructs 24. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/20300 Blog noise [25]Haskell news from the blogosphere. * [26]STM, IO, and a Simple Persistence Model * [27]Dynamic programming in Haskell * [28]Collected 'good math/bad math' Haskell articles * [29]3 open questions about monads * [30]Documentation, libraries and speed matter * [31]Why monads matter * [32]Design Patterns in Haskell: bracket * [33]Practical Haskell: shell scripting with error handling and privilege separation * [34]Simple socket programming * [35]'interact' for TCP sockets * [36]Monads in C, part 3 * [37]Directory tree printing in Haskell. Part 2 * [38]Monads through Pictures * [39]Notes on hacking Haskell * [40]Wanted: Haskell Programmer * [41]Why Publish CS Papers Without Code? * [42]The 8 ways to report errors in Haskell 25. http://planet.haskell.org/ 26. http://mult.ifario.us/articles/2007/03/04/stm-and-io 27. http://sequence.complete.org/node/263 28. http://scienceblogs.com/goodmath/goodmath/programming/haskell/ 29. http://www.randomhacks.net/articles/2007/03/05/three-things-i-dont-understan... 30. http://kawagner.blogspot.com/2007/03/why-do-most-people-seem-to-use-inferior... 31. http://www.rfc1149.net/blog/2007/03/06/why-monads-matter/ 32. http://notes-on-haskell.blogspot.com/2007/03/design-patterns-in-haskell-brac... 33. http://cgi.cse.unsw.edu.au/~dons/blog/2007/03/06#programmable-semicolons 34. http://metavar.blogspot.com/2007/03/simple-socket-programming.html 35. http://stephan.walter.name/blog/computers/programming/haskell/interacttcp.ht... 36. http://sigfpe.blogspot.com/2007/03/monads-in-c-pt-iii.html 37. http://blog.moertel.com/articles/2007/03/07/directory-tree-printing-in-haske... 38. http://www.bolour.com/papers/monads-through-pictures.html 39. http://metavar.blogspot.com/2007/03/haskell-hacking-notes-or-prelude-to.html 40. http://blogs.teamb.com/craigstuntz/archive/2007/03/09/WantedHaskellDeveloper... 41. http://billmill.org/why_no_code 42. http://www.randomhacks.net/articles/2007/03/10/haskell-8-ways-to-report-erro... Quotes of the Week * fishkandy: The problem with comparing apples to apples is that haskell has 'mango daiquiri' as a basic fruit * fax--: I wake up with a headache because of you, Haskell * norpan: I use functions, but i don't use them as arrows: I prefer silver bullets * ray: Some people claim everything is lisp. One time I was eating some spaghetti and someone came by and said: 'Hey, nice lisp dialect you're hacking in there' * roconnor: Damn it! Haskell pseudo code is indistinguishable from actual code * shapr: Today's nifty error message: *Main> thread blotttchhhkrrreeeedaaa dddinbbbdllleooofcccikkkneeeidddt eiiilnnnydddeeefffiiinnniiittteeelllyyy * stepcut: C? isn't that some low-level language that compilers output to? * wkh: Why does the haskell webpage link to 'research papers' under the 'getting started' section? Code Watch Tue Mar 6 06:31:12 PST 2007. Simon Marlow. [43]add noDuplicate#. This primop ensures that the current computation is not being duplicated, by calling threadPaused(). The idea is to use it inside unsafePerformIO/unsafeInterleaveIO (see #986). 43. http://article.gmane.org/gmane.comp.lang.haskell.cvs.ghc/19536 About the Haskell Weekly News Each week, new editions are posted to [44]the Haskell mailing list as well as to [45]the Haskell Sequence and [46]Planet Haskell. [47]RSS is also available, and headlines appear on [48]haskell.org. Headlines are available as [49]PDF. To help create new editions of this newsletter, please see the [50]contributing information. Send stories to dons at cse.unsw.edu.au. 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