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Re: [Haskell-cafe] ANNOUNCE: Graphalyze-0.7.0.0
by Ivan Lazar Miljenovic 29 Sep '09

29 Sep '09

Eugene Kirpichov <ekirpichov(a)gmail.com> writes: > Ivan, could you please mention some examples of things you can do with > the library here in the mailing list? I am intrigued by the idea. Couldn't you wait until you read my announcement email for SourceGraph? :p Other ideas I had for this kind of analysis: * Examine the internal structure of a company/department/etc. in terms of the employee hierarchy. * Who-knows-who: analyse address books (whether it's traditional, email, Facebook, etc.); this is related to the six-degree problem. > > 2009/9/29 Ivan Lazar Miljenovic <ivan.miljenovic(a)gmail.com>: >> Graphalyze [1] is a library for using graph-theoretic techniques to >> analyse the relationships inherent within discrete data. It was >> originally written for my Honours thesis [2] last year, and I have now >> started updating it. >> >> [1] http://hackage.haskell.org/package/Graphalyze >> [2] http://ivanmiljenovic.wordpress.com/2008/11/03/graph-theoretic-analysis-of-… >> >> Graphalyze provides helper functions to import discrete data, analyse it >> using various algorithms (a dodgy term, I know, but I couldn't think of >> a better one) and then create a report with the results. >> >> The main changes since the previous version are: >> >> * The ability to have graphs with edge labels. >> >> * More of a focus on applying changes to the overall information state >> of the data rather than just extracting the graph and applying a >> function to it. >> >> * Usage of the updated features in the graphviz library >> (http://hackage.haskell.org/package/graphviz) to visualise graphs. >> >> Changes to come: >> >> * Re-do the reporting framework to use more of a pretty-printing >> approach and make it more customisable. >> >> -- >> Ivan Lazar Miljenovic >> Ivan.Miljenovic(a)gmail.com >> IvanMiljenovic.wordpress.com >> _______________________________________________ >> Haskell-Cafe mailing list >> Haskell-Cafe(a)haskell.org >> http://www.haskell.org/mailman/listinfo/haskell-cafe >> -- Ivan Lazar Miljenovic Ivan.Miljenovic(a)gmail.com IvanMiljenovic.wordpress.com

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ANNOUNCE: Graphalyze-0.7.0.0
by Ivan Lazar Miljenovic 29 Sep '09

29 Sep '09

Graphalyze [1] is a library for using graph-theoretic techniques to analyse the relationships inherent within discrete data. It was originally written for my Honours thesis [2] last year, and I have now started updating it. [1] http://hackage.haskell.org/package/Graphalyze [2] http://ivanmiljenovic.wordpress.com/2008/11/03/graph-theoretic-analysis-of-… Graphalyze provides helper functions to import discrete data, analyse it using various algorithms (a dodgy term, I know, but I couldn't think of a better one) and then create a report with the results. The main changes since the previous version are: * The ability to have graphs with edge labels. * More of a focus on applying changes to the overall information state of the data rather than just extracting the graph and applying a function to it. * Usage of the updated features in the graphviz library (http://hackage.haskell.org/package/graphviz) to visualise graphs. Changes to come: * Re-do the reporting framework to use more of a pretty-printing approach and make it more customisable. -- Ivan Lazar Miljenovic Ivan.Miljenovic(a)gmail.com IvanMiljenovic.wordpress.com

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ANNOUNCE: graphviz-2999.6.0.0
by Ivan Lazar Miljenovic 29 Sep '09

29 Sep '09

I'm pleased to announce version 2999.6.0.0 [1] of the graphviz library, which provides bindings to the GraphViz [2] suite of tools for drawing graphs. [1] http://hackage.haskell.org/package/graphviz-2999.6.0.0 [2] http://www.graphviz.org/ Changes since the previous version are: * Remove some Shape aliases and change capitalisation of others. * Properly parse and print IDs of clusters. * Allow NodeCluster values have node types different from the LNode they come from. Since the node type is only used for passing to the function to create the appropriate Attributes for that node, this can mean avoiding having to apply a transformation function before getting the attributes if you have a composite type for node value/cluster. -- Ivan Lazar Miljenovic Ivan.Miljenovic(a)gmail.com IvanMiljenovic.wordpress.com

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ANN: rss2irc 0.4 released
by Simon Michael 27 Sep '09

27 Sep '09

I have released rss2irc 0.4, with some improvements from the field: - fix a problem connecting with irc.quakenet.org (Radoslav Dorcik) - feed polling now recovers from transient failures - can poll a local file: uri as well as remote uris - more robust new item detection, with some alternate strategies available - --idle option, waits for channel inactivity before announcing - limit individual field sizes, preventing too many irc messages per item - misc. output improvements - logging improvements - --delay now takes minutes, not seconds See hackage for more detail. Note the new contributor! Thanks Radoslav. home: http://hackage.haskell.org/package/rss2irc darcs repo: http://joyful.com/darcsweb/darcsweb.cgi?r=rss2irc I am currently using this to run hackagebot, darcscommitbot and other announce-bots on freenode. A tip: if you experiment, avoid joining the irc server too frequently; once per minute may be ok. Feedback and patches welcome. Best, -Simon

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Sorry about the triple post
by Joe Fredette 26 Sep '09

26 Sep '09

Trying to work out how to make sendmail do what I want, my computer is a fickle beast. Also- it should be HWN issue 133. But I'm an idiot, and just copied the value without thinking. Someday, when I automate all the uploading/sending to the list business, this will not be an issue... :/ /Joe

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Haskell Weekly News: Issue 131 - Semptember 25, 2009
by Joe Fredette 26 Sep '09

26 Sep '09

This week is an experiment, I'm eliminating the mail client from the sendout, and simply using sendmail directly. If this doesn't fix the line ending problem, then I'm pretty sure it's a software issue, and not a client issue. If you notice problems, please email me at this address, put [HWN] in the subject line so my filters will catch it. Please _don't_ email me if there are no problems. Thanks, /Joe --------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20090926 Issue 133 - September 26, 2009 --------------------------------------------------------------------------- Welcome to issue 133 of HWN, a newsletter covering developments in the [1]Haskell community. This week, we have a few new libraries, some interesting discussion about EDSLs, a comment from Oleg, and dons extolling the virtues of SCIENCE! On the new HWN software front, I've decided to jump right into something I had planned for far further down the development chain. Specifically, rather than scraping GMane for messages, I've been working on a way to grab the messages directly from the mailing-lists. I'm not entirely sure how I'm going to create links as they are now for the messages, but one crisis at a time. Till next week, here's the Haskell Weekly News! Announcements epoll bindings 0.2. Toralf Wittner [2]announced the release of epoll bindings 0.2 available [3]here. Epoll is an I/O event notification facility for Linux similar to poll but with good scaling characteristics. This release adds a buffer abstraction on top of the existing low-level bindings, so client code can write and read to buffers without having to deal directly with the underlying epoll event handling. diagrams 0.2.1, and planned major improvements. Brent Yorgey [4]announced version 0.2.1 of the diagrams library, available now on [5]Hackage. This minor release which fixes a few bugs and adds a few new combinators, most notably a grid layout combinator contributed by Ganesh Sittampalam. Workflow-0.5.5, TCache-0.6.4 RefSerialize-0.2.4. Alberto G. Corona [6]announced Workflow 0.5.5. Workflow provides a monad transformer that encapsulates any monad in a state monad that bring automatic state logging and recovery. A workflow can be viewed as a thread that persist across planeed or unplanned application shutdowns. When recovering the execution is resumed at the last action that was logged. The process continues at the same state as if not interruption took place. graphviz-2999.5.1.1. Ivan Lazar Miljenovic [7]announced version 2999.5.1.1 of the [8]graphviz library. This is another bug-fix release, fixing the problem spotted by Kathleen Fisher where Dot keywords need to be explicitly quoted if used as labels, etc. There is no change to the API. histogram-fill, library for creating histograms. Khudyakov Alexey [9]announced [10]histogram-fill. histogram-fill provides a generic and convenient API for making histograms. Features include, multiple simultaneous histogram creation, Immutable histograms, and Serialization to and from human readable text. Darcs Hacking Sprint - 14-15 November Vienna. Eric Kow [11]announced the third Darcs Hacking Sprint. Which will take place 14-15 November, 2009 at the University of Technology, Vienna, Austria. Anybody who wants to hack on Darcs (or Camp, Focal, SO6, etc) -- Beginners especially -- are welcome! 2nd CFP: TLDI 2010. Andrew Kennedy [12]announced a second call for papers for TLDI2010, the Types in Language Design and Implementation Workshop. darcs 2.3.1: better docs, fewer bugs. Reinier Lamers [13]announced a new stable version of darcs, with bugfixes from 2.3.0, improved documentation, and removal of the old autoconf build system. TFM09: Call for Participation (FMWeek, Eindhoven, November 2009). J.N. Oliveira [14]announced a Call for Participation in TFM2009 2nd Int. FME Conference on Teaching Formal Methods Friday, November 6th 2009, co-located with FM2009 : 16th Int. Symposium on Formal Methods Eindhoven, the Netherlands, November 2 - November 6, 2009. Discussion Monad Tutorial in C++. Adrian May [15]wrote a tutorial about monads in some other niche language... Beginning of a meta-Haskell. Oleg -- [16]as if he needs any introduction -- commented on things far above my ability to understand. Evidently, however, it involves extensible, modular interpreters in the ``tagless final'' style. It was a reply to an earlier thread [17]here. An issue with EDSLs in the ``finally tagless'' tradition. Brad Larsen [18]talked about his run in with [19]the expression problem while experimenting with EDSLs. Blog noise [20]Haskell news from the [21]blogosphere. Blog posts from people new to the Haskell community are marked with >>>, be sure to welcome them! * Bryan O'Sullivan: [22]Riddle me this. * David Amos: [23]Finite geometries, part 3: Points in PG(n,Fq). David's continuing series on Finite Geometries. * Neil Brown: [24]Concurrent Pearl: The Expanding Prime Pipeline. * Mikael Vejdemo Johansson (Syzygy-): [25][MATH198] Lecture 1 now online. Mikael's first Category Theory Lecture is up online. * Brent Yorgey: [26]diagrams 0.2.1, and future plans. * Alex McLean: [27]hackpact week 4. Part of the continuing series on Alex's hackpact progress. * Manuel M T Chakravarty: [28]Heads Up: GHC devs on Macs - GHC's testsuite crashes spotlight indexer on SL. * Clint Moore: [29]8 Cores of Awesome. * Bryan O'Sullivan: [30]Video of my CUFP keynote. * Chris Smith: [31]Thoughts on Hackage and the Haskell Platform. * Manuel M T Chakravarty: [32]Haskell Bindings to C -> c2hs. * Neil Brown: [33]Functions into processes, using arrows. * Brent Yorgey: [34]Functional MetaPost. * Malcolm Wallace: [35]Haskell Symposium 2009 - videos now online. * DEFUN 2009: [36]DEFUN and CUFP 2009 registration are now open!. * Chris Smith: [37]Type Classes With An Easier Example. * Darcs: [38]darcs weekly news #41. * Greg Bacon: [39]Haskell craps. * Bryan O'Sullivan: [40]A new pseudo-random number generator for Haskell. * Thomas M. DuBuisson: [41]HacPDX is Coming. * Dan Piponi (sigfpe): [42]More Parsing With Best First Search. * Osfameron: [43]Coin Tricks. Quotes of the Week * lilac: ponders whether unsafePerformIO would be better as simonSaysPerformIO * bos: [On the type signature of hPrintf] This makes me a sad Irish panda. * ksf: (But if (on the other hand)) (I think only a number in general (whether it be five or a hundred)) (this thought is rather the representation of a method (whereby a multiplicity (for instance a thousand) may be represented (in an image in conformity with a certain concept)) than the image itself. * dons: ah, via the magic of SCIENCE * dobblego: many of my colleagues used to be [fond of ruby] as well until I was let loose on them * dons: (on whether a library is wanted) *yes* put it on Hackage! * BMeph: (about parsec) 'Cause it's light-years ahead of the competition! * switch: Comeon people! You make the news! * ray: I think programmers make the worst programmers, also the worst people, and I'm saying this having not looked at programming reddit in a while. * Orclev: ... a lot of haskell still looks greek to me, and I'm not talking about lambdas. * Jason Dusek: "Some day, we're going to need a short, catchy name for Cabal packages. Let's call them cabbages." [see http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63649] * Reinier Lamers: If we keep up the current pace of performance hacking, darcs will be complete before you even hit the enter key in a few years * Trent Buck: [To Reiner Lamers] With the appropriate (ie unbuffered) terminal, this is already the case for interactive prompts. About the Haskell Weekly News 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. To help create new editions of this newsletter, please see the information on [49]how to contribute. Send stories to jfredett . at . gmail . dot . com. The darcs repository is available at darcs get [50]http://patch-tag.com/r/HWN2/home . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63815 3. http://hackage.haskell.org/package/epoll 4. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63791 5. http://hackage.haskell.org/package/diagrams 6. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63786 7. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63770 8. http://hackage.haskell.org/package/graphviz-2999.5.1.1 9. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63640 10. http://hackage.haskell.org/package/histogram-fill 11. http://article.gmane.org/gmane.comp.lang.haskell.general/17511 12. http://article.gmane.org/gmane.comp.lang.haskell.general/17508 13. http://article.gmane.org/gmane.comp.lang.haskell.general/17507 14. http://article.gmane.org/gmane.comp.lang.haskell.general/17506 15. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63800 16. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63761 17. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 18. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 19. http://www.daimi.au.dk/~madst/tool/papers/expression.txt 20. http://planet.haskell.org/ 21. http://haskell.org/haskellwiki/Blog_articles 22. http://www.serpentine.com/blog/2009/09/25/riddle-me-this/ 23. http://haskellformaths.blogspot.com/2009/09/finite-geometries-part-3-points… 24. http://chplib.wordpress.com/2009/09/24/the-expanding-prime-pipeline/ 25. http://blog.mikael.johanssons.org/archive/2009/09/math198-lecture-1-now-onl… 26. http://byorgey.wordpress.com/2009/09/24/diagrams-0-2-1-and-future-plans/ 27. http://yaxu.org/hackpact-week-3-2/ 28. http://justtesting.org/post/195668539 29. http://www.l2mlogistics.com/2009/09/8-cores-of-awesome.html 30. http://www.serpentine.com/blog/2009/09/23/video-of-my-cufp-keynote/ 31. http://cdsmith.wordpress.com/2009/09/23/thoughts-on-hackage-and-the-haskell… 32. http://justtesting.org/post/194790750 33. http://chplib.wordpress.com/2009/09/22/functions-into-processes-using-arrow… 34. http://byorgey.wordpress.com/2009/09/21/functional-metapost/ 35. http://feedproxy.google.com/~r/malcolm/~3/wxsdwfUArJ8/haskell-symposium-200… 36. http://www.defun2009.info/blog/2009/06/defun-2009-registration-is-now-open/ 37. http://cdsmith.wordpress.com/2009/09/20/side-computations-via-type-classes/ 38. http://blog.darcs.net/2009/09/darcs-weekly-news-41.html 39. http://feedproxy.google.com/~r/gbacon/~3/QILx5EtQN4o/haskell-craps.html 40. http://www.serpentine.com/blog/2009/09/19/a-new-pseudo-random-number-genera… 41. http://tommd.wordpress.com/2009/09/19/hacpdx-is-coming/ 42. http://blog.sigfpe.com/2009/09/language-nomonomorphismrestrictiongener.html 43. http://greenokapi.net/blog/2009/09/19/coin-tricks/ 44. http://www.haskell.org/mailman/listinfo/haskell 45. http://sequence.complete.org/ 46. http://planet.haskell.org/ 47. http://sequence.complete.org/node/feed 48. http://haskell.org/ 49. http://haskell.org/haskellwiki/HWN 50. http://patch-tag.com/r/HWN2/home

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Haskell Weekly News: Issue 131 - Semptember 25, 2009
by Joe Fredette 26 Sep '09

26 Sep '09

This week is an experiment, I'm eliminating the mail client from the sendout, and simply using sendmail directly. If this doesn't fix the line ending problem, then I'm pretty sure it's a software issue, and not a client issue. If you notice problems, please email me at this address, put [HWN] in the subject line so my filters will catch it. Please _don't_ email me if there are no problems. Thanks, /Joe --------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20090926 Issue 133 - September 26, 2009 --------------------------------------------------------------------------- Welcome to issue 133 of HWN, a newsletter covering developments in the [1]Haskell community. This week, we have a few new libraries, some interesting discussion about EDSLs, a comment from Oleg, and dons extolling the virtues of SCIENCE! On the new HWN software front, I've decided to jump right into something I had planned for far further down the development chain. Specifically, rather than scraping GMane for messages, I've been working on a way to grab the messages directly from the mailing-lists. I'm not entirely sure how I'm going to create links as they are now for the messages, but one crisis at a time. Till next week, here's the Haskell Weekly News! Announcements epoll bindings 0.2. Toralf Wittner [2]announced the release of epoll bindings 0.2 available [3]here. Epoll is an I/O event notification facility for Linux similar to poll but with good scaling characteristics. This release adds a buffer abstraction on top of the existing low-level bindings, so client code can write and read to buffers without having to deal directly with the underlying epoll event handling. diagrams 0.2.1, and planned major improvements. Brent Yorgey [4]announced version 0.2.1 of the diagrams library, available now on [5]Hackage. This minor release which fixes a few bugs and adds a few new combinators, most notably a grid layout combinator contributed by Ganesh Sittampalam. Workflow-0.5.5, TCache-0.6.4 RefSerialize-0.2.4. Alberto G. Corona [6]announced Workflow 0.5.5. Workflow provides a monad transformer that encapsulates any monad in a state monad that bring automatic state logging and recovery. A workflow can be viewed as a thread that persist across planeed or unplanned application shutdowns. When recovering the execution is resumed at the last action that was logged. The process continues at the same state as if not interruption took place. graphviz-2999.5.1.1. Ivan Lazar Miljenovic [7]announced version 2999.5.1.1 of the [8]graphviz library. This is another bug-fix release, fixing the problem spotted by Kathleen Fisher where Dot keywords need to be explicitly quoted if used as labels, etc. There is no change to the API. histogram-fill, library for creating histograms. Khudyakov Alexey [9]announced [10]histogram-fill. histogram-fill provides a generic and convenient API for making histograms. Features include, multiple simultaneous histogram creation, Immutable histograms, and Serialization to and from human readable text. Darcs Hacking Sprint - 14-15 November Vienna. Eric Kow [11]announced the third Darcs Hacking Sprint. Which will take place 14-15 November, 2009 at the University of Technology, Vienna, Austria. Anybody who wants to hack on Darcs (or Camp, Focal, SO6, etc) -- Beginners especially -- are welcome! 2nd CFP: TLDI 2010. Andrew Kennedy [12]announced a second call for papers for TLDI2010, the Types in Language Design and Implementation Workshop. darcs 2.3.1: better docs, fewer bugs. Reinier Lamers [13]announced a new stable version of darcs, with bugfixes from 2.3.0, improved documentation, and removal of the old autoconf build system. TFM09: Call for Participation (FMWeek, Eindhoven, November 2009). J.N. Oliveira [14]announced a Call for Participation in TFM2009 2nd Int. FME Conference on Teaching Formal Methods Friday, November 6th 2009, co-located with FM2009 : 16th Int. Symposium on Formal Methods Eindhoven, the Netherlands, November 2 - November 6, 2009. Discussion Monad Tutorial in C++. Adrian May [15]wrote a tutorial about monads in some other niche language... Beginning of a meta-Haskell. Oleg -- [16]as if he needs any introduction -- commented on things far above my ability to understand. Evidently, however, it involves extensible, modular interpreters in the ``tagless final'' style. It was a reply to an earlier thread [17]here. An issue with EDSLs in the ``finally tagless'' tradition. Brad Larsen [18]talked about his run in with [19]the expression problem while experimenting with EDSLs. Blog noise [20]Haskell news from the [21]blogosphere. Blog posts from people new to the Haskell community are marked with >>>, be sure to welcome them! * Bryan O'Sullivan: [22]Riddle me this. * David Amos: [23]Finite geometries, part 3: Points in PG(n,Fq). David's continuing series on Finite Geometries. * Neil Brown: [24]Concurrent Pearl: The Expanding Prime Pipeline. * Mikael Vejdemo Johansson (Syzygy-): [25][MATH198] Lecture 1 now online. Mikael's first Category Theory Lecture is up online. * Brent Yorgey: [26]diagrams 0.2.1, and future plans. * Alex McLean: [27]hackpact week 4. Part of the continuing series on Alex's hackpact progress. * Manuel M T Chakravarty: [28]Heads Up: GHC devs on Macs - GHC's testsuite crashes spotlight indexer on SL. * Clint Moore: [29]8 Cores of Awesome. * Bryan O'Sullivan: [30]Video of my CUFP keynote. * Chris Smith: [31]Thoughts on Hackage and the Haskell Platform. * Manuel M T Chakravarty: [32]Haskell Bindings to C -> c2hs. * Neil Brown: [33]Functions into processes, using arrows. * Brent Yorgey: [34]Functional MetaPost. * Malcolm Wallace: [35]Haskell Symposium 2009 - videos now online. * DEFUN 2009: [36]DEFUN and CUFP 2009 registration are now open!. * Chris Smith: [37]Type Classes With An Easier Example. * Darcs: [38]darcs weekly news #41. * Greg Bacon: [39]Haskell craps. * Bryan O'Sullivan: [40]A new pseudo-random number generator for Haskell. * Thomas M. DuBuisson: [41]HacPDX is Coming. * Dan Piponi (sigfpe): [42]More Parsing With Best First Search. * Osfameron: [43]Coin Tricks. Quotes of the Week * lilac: ponders whether unsafePerformIO would be better as simonSaysPerformIO * bos: [On the type signature of hPrintf] This makes me a sad Irish panda. * ksf: (But if (on the other hand)) (I think only a number in general (whether it be five or a hundred)) (this thought is rather the representation of a method (whereby a multiplicity (for instance a thousand) may be represented (in an image in conformity with a certain concept)) than the image itself. * dons: ah, via the magic of SCIENCE * dobblego: many of my colleagues used to be [fond of ruby] as well until I was let loose on them * dons: (on whether a library is wanted) *yes* put it on Hackage! * BMeph: (about parsec) 'Cause it's light-years ahead of the competition! * switch: Comeon people! You make the news! * ray: I think programmers make the worst programmers, also the worst people, and I'm saying this having not looked at programming reddit in a while. * Orclev: ... a lot of haskell still looks greek to me, and I'm not talking about lambdas. * Jason Dusek: "Some day, we're going to need a short, catchy name for Cabal packages. Let's call them cabbages." [see http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63649] * Reinier Lamers: If we keep up the current pace of performance hacking, darcs will be complete before you even hit the enter key in a few years * Trent Buck: [To Reiner Lamers] With the appropriate (ie unbuffered) terminal, this is already the case for interactive prompts. About the Haskell Weekly News 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. To help create new editions of this newsletter, please see the information on [49]how to contribute. Send stories to jfredett . at . gmail . dot . com. The darcs repository is available at darcs get [50]http://patch-tag.com/r/HWN2/home . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63815 3. http://hackage.haskell.org/package/epoll 4. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63791 5. http://hackage.haskell.org/package/diagrams 6. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63786 7. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63770 8. http://hackage.haskell.org/package/graphviz-2999.5.1.1 9. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63640 10. http://hackage.haskell.org/package/histogram-fill 11. http://article.gmane.org/gmane.comp.lang.haskell.general/17511 12. http://article.gmane.org/gmane.comp.lang.haskell.general/17508 13. http://article.gmane.org/gmane.comp.lang.haskell.general/17507 14. http://article.gmane.org/gmane.comp.lang.haskell.general/17506 15. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63800 16. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63761 17. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 18. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 19. http://www.daimi.au.dk/~madst/tool/papers/expression.txt 20. http://planet.haskell.org/ 21. http://haskell.org/haskellwiki/Blog_articles 22. http://www.serpentine.com/blog/2009/09/25/riddle-me-this/ 23. http://haskellformaths.blogspot.com/2009/09/finite-geometries-part-3-points… 24. http://chplib.wordpress.com/2009/09/24/the-expanding-prime-pipeline/ 25. http://blog.mikael.johanssons.org/archive/2009/09/math198-lecture-1-now-onl… 26. http://byorgey.wordpress.com/2009/09/24/diagrams-0-2-1-and-future-plans/ 27. http://yaxu.org/hackpact-week-3-2/ 28. http://justtesting.org/post/195668539 29. http://www.l2mlogistics.com/2009/09/8-cores-of-awesome.html 30. http://www.serpentine.com/blog/2009/09/23/video-of-my-cufp-keynote/ 31. http://cdsmith.wordpress.com/2009/09/23/thoughts-on-hackage-and-the-haskell… 32. http://justtesting.org/post/194790750 33. http://chplib.wordpress.com/2009/09/22/functions-into-processes-using-arrow… 34. http://byorgey.wordpress.com/2009/09/21/functional-metapost/ 35. http://feedproxy.google.com/~r/malcolm/~3/wxsdwfUArJ8/haskell-symposium-200… 36. http://www.defun2009.info/blog/2009/06/defun-2009-registration-is-now-open/ 37. http://cdsmith.wordpress.com/2009/09/20/side-computations-via-type-classes/ 38. http://blog.darcs.net/2009/09/darcs-weekly-news-41.html 39. http://feedproxy.google.com/~r/gbacon/~3/QILx5EtQN4o/haskell-craps.html 40. http://www.serpentine.com/blog/2009/09/19/a-new-pseudo-random-number-genera… 41. http://tommd.wordpress.com/2009/09/19/hacpdx-is-coming/ 42. http://blog.sigfpe.com/2009/09/language-nomonomorphismrestrictiongener.html 43. http://greenokapi.net/blog/2009/09/19/coin-tricks/ 44. http://www.haskell.org/mailman/listinfo/haskell 45. http://sequence.complete.org/ 46. http://planet.haskell.org/ 47. http://sequence.complete.org/node/feed 48. http://haskell.org/ 49. http://haskell.org/haskellwiki/HWN 50. http://patch-tag.com/r/HWN2/home

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Haskell Weekly News: Issue 131 - Semptember 25, 2009
by Joe Fredette 26 Sep '09

26 Sep '09

This week is an experiment, I'm eliminating the mail client from the sendout, and simply using sendmail directly. If this doesn't fix the line ending problem, then I'm pretty sure it's a software issue, and not a client issue. If you notice problems, please email me at this address, put [HWN] in the subject line so my filters will catch it. Please _don't_ email me if there are no problems. Thanks, /Joe --------------------------------------------------------------------------- Haskell Weekly News http://sequence.complete.org/hwn/20090926 Issue 133 - September 26, 2009 --------------------------------------------------------------------------- Welcome to issue 133 of HWN, a newsletter covering developments in the [1]Haskell community. This week, we have a few new libraries, some interesting discussion about EDSLs, a comment from Oleg, and dons extolling the virtues of SCIENCE! On the new HWN software front, I've decided to jump right into something I had planned for far further down the development chain. Specifically, rather than scraping GMane for messages, I've been working on a way to grab the messages directly from the mailing-lists. I'm not entirely sure how I'm going to create links as they are now for the messages, but one crisis at a time. Till next week, here's the Haskell Weekly News! Announcements epoll bindings 0.2. Toralf Wittner [2]announced the release of epoll bindings 0.2 available [3]here. Epoll is an I/O event notification facility for Linux similar to poll but with good scaling characteristics. This release adds a buffer abstraction on top of the existing low-level bindings, so client code can write and read to buffers without having to deal directly with the underlying epoll event handling. diagrams 0.2.1, and planned major improvements. Brent Yorgey [4]announced version 0.2.1 of the diagrams library, available now on [5]Hackage. This minor release which fixes a few bugs and adds a few new combinators, most notably a grid layout combinator contributed by Ganesh Sittampalam. Workflow-0.5.5, TCache-0.6.4 RefSerialize-0.2.4. Alberto G. Corona [6]announced Workflow 0.5.5. Workflow provides a monad transformer that encapsulates any monad in a state monad that bring automatic state logging and recovery. A workflow can be viewed as a thread that persist across planeed or unplanned application shutdowns. When recovering the execution is resumed at the last action that was logged. The process continues at the same state as if not interruption took place. graphviz-2999.5.1.1. Ivan Lazar Miljenovic [7]announced version 2999.5.1.1 of the [8]graphviz library. This is another bug-fix release, fixing the problem spotted by Kathleen Fisher where Dot keywords need to be explicitly quoted if used as labels, etc. There is no change to the API. histogram-fill, library for creating histograms. Khudyakov Alexey [9]announced [10]histogram-fill. histogram-fill provides a generic and convenient API for making histograms. Features include, multiple simultaneous histogram creation, Immutable histograms, and Serialization to and from human readable text. Darcs Hacking Sprint - 14-15 November Vienna. Eric Kow [11]announced the third Darcs Hacking Sprint. Which will take place 14-15 November, 2009 at the University of Technology, Vienna, Austria. Anybody who wants to hack on Darcs (or Camp, Focal, SO6, etc) -- Beginners especially -- are welcome! 2nd CFP: TLDI 2010. Andrew Kennedy [12]announced a second call for papers for TLDI2010, the Types in Language Design and Implementation Workshop. darcs 2.3.1: better docs, fewer bugs. Reinier Lamers [13]announced a new stable version of darcs, with bugfixes from 2.3.0, improved documentation, and removal of the old autoconf build system. TFM09: Call for Participation (FMWeek, Eindhoven, November 2009). J.N. Oliveira [14]announced a Call for Participation in TFM2009 2nd Int. FME Conference on Teaching Formal Methods Friday, November 6th 2009, co-located with FM2009 : 16th Int. Symposium on Formal Methods Eindhoven, the Netherlands, November 2 - November 6, 2009. Discussion Monad Tutorial in C++. Adrian May [15]wrote a tutorial about monads in some other niche language... Beginning of a meta-Haskell. Oleg -- [16]as if he needs any introduction -- commented on things far above my ability to understand. Evidently, however, it involves extensible, modular interpreters in the ``tagless final'' style. It was a reply to an earlier thread [17]here. An issue with EDSLs in the ``finally tagless'' tradition. Brad Larsen [18]talked about his run in with [19]the expression problem while experimenting with EDSLs. Blog noise [20]Haskell news from the [21]blogosphere. Blog posts from people new to the Haskell community are marked with >>>, be sure to welcome them! * Bryan O'Sullivan: [22]Riddle me this. * David Amos: [23]Finite geometries, part 3: Points in PG(n,Fq). David's continuing series on Finite Geometries. * Neil Brown: [24]Concurrent Pearl: The Expanding Prime Pipeline. * Mikael Vejdemo Johansson (Syzygy-): [25][MATH198] Lecture 1 now online. Mikael's first Category Theory Lecture is up online. * Brent Yorgey: [26]diagrams 0.2.1, and future plans. * Alex McLean: [27]hackpact week 4. Part of the continuing series on Alex's hackpact progress. * Manuel M T Chakravarty: [28]Heads Up: GHC devs on Macs - GHC's testsuite crashes spotlight indexer on SL. * Clint Moore: [29]8 Cores of Awesome. * Bryan O'Sullivan: [30]Video of my CUFP keynote. * Chris Smith: [31]Thoughts on Hackage and the Haskell Platform. * Manuel M T Chakravarty: [32]Haskell Bindings to C -> c2hs. * Neil Brown: [33]Functions into processes, using arrows. * Brent Yorgey: [34]Functional MetaPost. * Malcolm Wallace: [35]Haskell Symposium 2009 - videos now online. * DEFUN 2009: [36]DEFUN and CUFP 2009 registration are now open!. * Chris Smith: [37]Type Classes With An Easier Example. * Darcs: [38]darcs weekly news #41. * Greg Bacon: [39]Haskell craps. * Bryan O'Sullivan: [40]A new pseudo-random number generator for Haskell. * Thomas M. DuBuisson: [41]HacPDX is Coming. * Dan Piponi (sigfpe): [42]More Parsing With Best First Search. * Osfameron: [43]Coin Tricks. Quotes of the Week * lilac: ponders whether unsafePerformIO would be better as simonSaysPerformIO * bos: [On the type signature of hPrintf] This makes me a sad Irish panda. * ksf: (But if (on the other hand)) (I think only a number in general (whether it be five or a hundred)) (this thought is rather the representation of a method (whereby a multiplicity (for instance a thousand) may be represented (in an image in conformity with a certain concept)) than the image itself. * dons: ah, via the magic of SCIENCE * dobblego: many of my colleagues used to be [fond of ruby] as well until I was let loose on them * dons: (on whether a library is wanted) *yes* put it on Hackage! * BMeph: (about parsec) 'Cause it's light-years ahead of the competition! * switch: Comeon people! You make the news! * ray: I think programmers make the worst programmers, also the worst people, and I'm saying this having not looked at programming reddit in a while. * Orclev: ... a lot of haskell still looks greek to me, and I'm not talking about lambdas. * Jason Dusek: "Some day, we're going to need a short, catchy name for Cabal packages. Let's call them cabbages." [see http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63649] * Reinier Lamers: If we keep up the current pace of performance hacking, darcs will be complete before you even hit the enter key in a few years * Trent Buck: [To Reiner Lamers] With the appropriate (ie unbuffered) terminal, this is already the case for interactive prompts. About the Haskell Weekly News 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. To help create new editions of this newsletter, please see the information on [49]how to contribute. Send stories to jfredett . at . gmail . dot . com. The darcs repository is available at darcs get [50]http://patch-tag.com/r/HWN2/home . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63815 3. http://hackage.haskell.org/package/epoll 4. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63791 5. http://hackage.haskell.org/package/diagrams 6. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63786 7. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63770 8. http://hackage.haskell.org/package/graphviz-2999.5.1.1 9. http://article.gmane.org/gmane.comp.lang.haskell.cafe/63640 10. http://hackage.haskell.org/package/histogram-fill 11. http://article.gmane.org/gmane.comp.lang.haskell.general/17511 12. http://article.gmane.org/gmane.comp.lang.haskell.general/17508 13. http://article.gmane.org/gmane.comp.lang.haskell.general/17507 14. http://article.gmane.org/gmane.comp.lang.haskell.general/17506 15. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63800 16. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63761 17. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 18. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/63751 19. http://www.daimi.au.dk/~madst/tool/papers/expression.txt 20. http://planet.haskell.org/ 21. http://haskell.org/haskellwiki/Blog_articles 22. http://www.serpentine.com/blog/2009/09/25/riddle-me-this/ 23. http://haskellformaths.blogspot.com/2009/09/finite-geometries-part-3-points… 24. http://chplib.wordpress.com/2009/09/24/the-expanding-prime-pipeline/ 25. http://blog.mikael.johanssons.org/archive/2009/09/math198-lecture-1-now-onl… 26. http://byorgey.wordpress.com/2009/09/24/diagrams-0-2-1-and-future-plans/ 27. http://yaxu.org/hackpact-week-3-2/ 28. http://justtesting.org/post/195668539 29. http://www.l2mlogistics.com/2009/09/8-cores-of-awesome.html 30. http://www.serpentine.com/blog/2009/09/23/video-of-my-cufp-keynote/ 31. http://cdsmith.wordpress.com/2009/09/23/thoughts-on-hackage-and-the-haskell… 32. http://justtesting.org/post/194790750 33. http://chplib.wordpress.com/2009/09/22/functions-into-processes-using-arrow… 34. http://byorgey.wordpress.com/2009/09/21/functional-metapost/ 35. http://feedproxy.google.com/~r/malcolm/~3/wxsdwfUArJ8/haskell-symposium-200… 36. http://www.defun2009.info/blog/2009/06/defun-2009-registration-is-now-open/ 37. http://cdsmith.wordpress.com/2009/09/20/side-computations-via-type-classes/ 38. http://blog.darcs.net/2009/09/darcs-weekly-news-41.html 39. http://feedproxy.google.com/~r/gbacon/~3/QILx5EtQN4o/haskell-craps.html 40. http://www.serpentine.com/blog/2009/09/19/a-new-pseudo-random-number-genera… 41. http://tommd.wordpress.com/2009/09/19/hacpdx-is-coming/ 42. http://blog.sigfpe.com/2009/09/language-nomonomorphismrestrictiongener.html 43. http://greenokapi.net/blog/2009/09/19/coin-tricks/ 44. http://www.haskell.org/mailman/listinfo/haskell 45. http://sequence.complete.org/ 46. http://planet.haskell.org/ 47. http://sequence.complete.org/node/feed 48. http://haskell.org/ 49. http://haskell.org/haskellwiki/HWN 50. http://patch-tag.com/r/HWN2/home

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ANN: Workflow-0.5.5, TCache-0.6.4 RefSerialize-0.2.4
by Alberto G. Corona 24 Sep '09

24 Sep '09

Hi I'm proud to announce Workflow 0.5.5. This is a package intended to define workflows as sequences of actions with he usual do notation. Such actions may include wait for events, queue messages, etc perform processing etc for days weeks or even years without regards for shutdowns and restarts. Technically, Workflow includes a monad transformer that encapsulates any computation in a state monad that bring automatic state logging and recovery. A workflow can be viewed as a thread that persist across planeed or unplanned application shutdowns. When recovering the excution is resumed at the last action that was logged. The process continues at the same state as if not interruption took place. Any feedback will be appreciated. Besides state logging and recovery, there are a number of communication primitives that are aware of persistence across reinitiations such are persistent queues, persistent timeouts, or wait for events in the STM monad. These primitives permits inter-woikflow communications and communications with external threads. I hope that this package would be useful for very long computations, either the programs that are CPU intensive and produce valuable intermediate data or programs that wait for actions from users and others processes during days or weeks. That is typical in web applications. Such programs can be defined in a single monadic procedure transparently, without regards of saving intermediate results or reinitiations at the correct point. This new version is not restricted to handle a single type. Every intermediate data must be an instance of Read and Show. For complex data types, other persistence mechanisms can be used (see documentation). The package is at: http://hackage.haskell.org/package/Workflow http://hackage.haskell.org/packages/archive/Workflow/0.5.5/Workflow-0.5.5.t… The tar archive has the documentation and some examples. Among them, a simulation of workflow for the creation and approval of documents, with two levels of approval and approval timeouts, It uses most of the features of the package. NOTE: cabal install reports Tar checksum errors when installed, however, such errors do not appear by downloading the tar.gz archive and decompressing it with the unix or windows tools. I do not know why cabal install behaves as such. Here is a simple example: This is a counter that shows a sequence of numbers, one a second: *module Main where import Control.Concurrent(threadDelay) import System.IO (hFlush,stdout) count n= do putStr (show n ++ " " ) >> hFlush stdout >> threadDelay 1000000 count (n+1) main= count 0 * This is the same program, with the added feature of remembering the last count after interruption (sequence.hs): *module Main where import Control.Workflow import Control.Concurrent(threadDelay) import System.IO (hFlush,stdout) mcount n= do step $ putStr (show n ++ " " ) >> hFlush stdout >> threadDelay 1000000 mcount (n+1) main= do registerType :: IO () registerType :: IO Int let start= 0 :: Int startWF "count" start [("count", mcount)] :: IO () * This is the execution log: *Worflow-0.5.5demos>runghc sequence.hs 0 1 2 3 4 5 6 7 sequence.hs: win32ConsoleHandler sequence.hs: sequence.hs: interrupted Worflow-0.5.5demos> Worflow-0.5.5demos>runghc sequence.hs 7 8 9 10 11 .... * This package uses TCache and RefSerialize. I also uploaded new versions of these packages with extensive documentation and examplles included in the tar.gz archives ( cabal install also repor checksum errors, but are OK when downloading and installing by hand): http://hackage.haskell.org/package/TCache <http://hackage.haskell.org/package/TCache> http://hackage.haskell.org/packages/archive/TCache/0.6.4/TCache-0.6.4.tar.gz http://hackage.haskell.org/package/RefSerialize <http://hackage.haskell.org/package/RefSerialize> http://hackage.haskell.org/packages/archive/RefSerialize/0.2.4/RefSerialize…

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ANNOUNCE: graphviz-2999.5.1.1
by Ivan Lazar Miljenovic 24 Sep '09

24 Sep '09

I'm pleased to announce version 2999.5.1.1 [1] of the graphviz library, which provides bindings to the GraphViz [2] suite of tools for drawing graphs. [1] http://hackage.haskell.org/package/graphviz-2999.5.1.1 [2] http://www.graphviz.org/ This is yet another bugfix release, fixing the problem spotted by Kathleen Fisher where Dot keywords need to be explicitly quoted if used as labels, etc. Once again, this is done automagically with no change to the API. -- Ivan Lazar Miljenovic Ivan.Miljenovic(a)gmail.com IvanMiljenovic.wordpress.com

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