- Haskell-Cafe - Haskell.org

Complete package description list
by Shakthi Kannan 07 Dec '11

07 Dec '11

Hi, I would like to know: 1. The correct source to get the complete list of available Haskell package descriptions 2. Any feed or notification mechanism to get newer updates on packages How often does the 00-index.tar.gz file from: http://hackage.haskell.org/packages/archive/00-index.tar.gz get updated? Or if there is a newer version, where is it made available? Given 00-index.tar.gz, and using the following RSS feed: http://hackage.haskell.org/packages/archive/recent.rss give me the complete list of available packages? Appreciate any suggestions in this regard, Thanks! SK -- Shakthi Kannan http://www.shakthimaan.com

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ANNOUNCE: monad-control-0.3
by Bas van Dijk 06 Dec '11

06 Dec '11

Hello, I just released monad-control-0.3. The package for lifting control operations (like catch, bracket, mask, alloca, timeout, forkIO, modifyMVar, etc.) through monad transformers: http://hackage.haskell.org/package/monad-control-0.3 It has a new and improved API which is: * easier to understand by explicitly representing the monadic state using type families. * 60 times faster than the previous release! * more general because control operations can now, not only be lifted from IO, but from any base monad (ST, STM, etc.) I also released a new package: lifted-base: http://hackage.haskell.org/package/lifted-base-0.1 It provides lifted versions of functions from the base library. Currently it exports the following modules: * Control.Exception.Lifted * Control.Concurrent.Lifted * Control.Concurrent.MVar.Lifted * System.Timeout.Lifted These are just modules which people have needed in the past. If you need a lifted version of some function, just ask me to add it or send me a patch. Note that Peter Simons just discovered that these packages don't build with GHC-7.0.4 (https://github.com/basvandijk/monad-control/issues/3) I just committed some fixes which enable them to be build on GHC >= 6.12.3. Hopefully I can release these fixes this weekend. Regards, Bas

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Re: [Haskell-cafe] How to get a file path to the program invoked?
by Greg Weber 06 Dec '11

06 Dec '11

In addition to argv[0] http://hackage.haskell.org/packages/archive/system-argv0/0.1/doc/html/Syste… There is also this package: http://hackage.haskell.org/packages/archive/FindBin/0.0.5/doc/html/System-E… System-Argv0 has special cases for windows- FindBin may not work there.

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GHCi and Cairo on Windows
by smeltzek＠eecs.oregonstate.edu 06 Dec '11

06 Dec '11

In effort to keep my work cross-platform, I am trying to get GHCi and Cairo working together nicely on Windows (as a back-end to Diagrams, if it matters.) When loading the library in GHCi I get the following error: Loading package cairo-0.12.2 ... linking ... ghc: unable to load package `cairo-0.12.2' I am able to build, link, and execute successfully using 'ghc --make' so I know the libraries are installed correctly. I'm using GHC as packaged in the most recent version of the Haskell Platform and the most recent all-in-one Windows bundle of GTK. I've seen quite similar errors reported months ago with no apparent solution. Any help would be appreciated! --Karl

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Re: [Haskell-cafe] Poll: Do you want a mascot? -- please stop this
by Giovanni Tirloni 06 Dec '11

06 Dec '11

On Wed, Nov 23, 2011 at 5:52 PM, heathmatlock <heathmatlock(a)gmail.com>wrote: > On Wed, Nov 23, 2011 at 1:40 PM, Alexander Bernauer < > alex-haskell(a)copton.net> wrote: > >> Yes >> >> PS: Why not using Doodle for the poll? >> > > Email is an easy way to make sure nobody votes twice. > 1. It's unlikely to get feedback from the larger Haskell community 2. It floods people with email they don't care (unless they care to keep track of the results) 3. One can just as easily create throw-away emails, subscribe to the list and answer the poll 4. etc... My suggestion is to create a poll somewhere else and let it run for at least a month. Or a more elaborated survey with additional questions trying to capture the community's feeling toward a masket and what kind. I don't think we are in a hurry to get a mascot here so let's take the time and do it properly. -- Giovanni

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Re: [Haskell-cafe] "could not create compact unwind"
by Mark Lentczner 06 Dec '11

06 Dec '11

The ld warning is benign. You can safely ignore it. It is a known issue with GHC and the latest Mac OS X tool chain, and we are stuck with it for awhile: http://hackage.haskell.org/trac/ghc/ticket/5019 The best way to remove versions of Haskell on a Mac is now my shiny new Mac uninstaller! I just put out a "release candidate" yesterday. You can find it here: Source: UninstallHS.hs (just runhaskell this)Executable: uninstall-hs.tgz (unpack and run if your ghc is broken) Running without will just list what's there and suggest what to do next. It is "dry-run" by default. - Mark PS.: "rm -rf ~/.ghc" only removes the package databases, not the packages themselves. It also removes your ghci configuration, so I don't recommend it.

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Re: [Haskell-cafe] How to get a file path to the program invoked?
by dokondr 06 Dec '11

06 Dec '11

Balazs, thanks for your comments! The first comment works just fine. With </> operator I get this: Main System.Environment.Executable System.FilePath> "/abc" </> "/" "/" Instead of getting "/abc/" I get "/". What am I doing wrong? On Mon, Dec 5, 2011 at 6:03 PM, Balazs Komuves <bkomuves(a)gmail.com> wrote: > > Two small comments: > > 1) This should work on Windows too, if you just leave out the word "Posix" > from the source: > import System.FilePath (splitFileName) > > 2) In general when dealing with paths, use the </> operator (from > System.FilePath) > instead of ++ "/" ++ > > Balazs > > > On Mon, Dec 5, 2011 at 1:44 PM, dokondr <dokondr(a)gmail.com> wrote: > >> This is how I finally solved this problem for POSIX complaint system: >> >> -- >> -- TestRun >> -- >> module Main where >> import System.Cmd (rawSystem) >> import System.Directory (getCurrentDirectory) >> import System.Environment.Executable (ScriptPath(..), getScriptPath) >> import System.FilePath.Posix (splitFileName) >> >> main = do >> >> path <- getMyPath >> putStrLn $ "myPath = " ++ path >> let cmdLine = path ++ "args.sh" >> rawSystem cmdLine ["iphone", "test-twitts.txt"] >> >> {-- >> data ScriptPath Source >> >> Constructors: >> Executable FilePath it was (probably) a proper compiled executable >> RunGHC FilePath it was a script run by runghc/runhaskell >> Interactive we are in GHCi >> --} >> >> getMyPath = do >> curDir <- getCurrentDirectory -- from System.Directory >> scriptPath <- getScriptPath -- from System.Environment.Executable >> let path = getMyPath' scriptPath curDir >> return path >> >> getMyPath' (Executable path) _ = fst (splitFileName path) >> getMyPath' (RunGHC path) _ = fst (splitFileName path) >> getMyPath' Interactive curDir = curDir++"/" >> >> >>

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writeFile: commitBuffer: invalid argument (Illegal byte sequence)
by dokondr 05 Dec '11

05 Dec '11

Hi, In GHC 7.0.3 / Mac OS X when trying to: writeFile "someFile" "(Hoping You Have A iPhone When I Do This) Lol Sleep Is When You Close These ---> \55357\56384" I get: commitBuffer: invalid argument (Illegal byte sequence) The string I am trying to write can also be seen here: http://twitter.com/#!/search/Hoping%20You%20Have%20A%20iPhone%20When%20I%20…<http://twitter.com/#%21/search/Hoping%20You%20Have%20A%20iPhone%20When%20I%…> It looks like 'writeFile' can not write unicode characters. Any workarounds? Thanks! Dmitri

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FLOPS 2012: final call for papers & deadline extension
by Tom Schrijvers 05 Dec '11

05 Dec '11

Final Call For Papers ===================== _EXTENDED SUBMISSION DEADLINE : December 16, 2011_ *Eleventh International Symposium on Functional and Logic Programming (FLOPS 2012)* May 23-25, 2012 Kobe, Japan [http://www.org.kobe-u.ac.jp/flops2012/] FLOPS is a forum for research on all issues concerning declarative programming, including functional programming and logic programming, and aims to promote cross-fertilization and integration between the two paradigms. Previous FLOPS meetings were held in Fuji Susono (1995), Shonan Village (1996), Kyoto (1998), Tsukuba (1999), Tokyo (2001), Aizu (2002), Nara (2004), Fuji Susono (2006), Ise (2008), and Sendai (2010). Topics ====== FLOPS solicits original papers in all areas of functional and logic programming, including (but not limited to): - Declarative Pearls: new and excellent declarative programs with illustrative applications. - Language issues: language design and constructs, programming methodology, integration of paradigms, interfacing with other languages, type systems, constraints, concurrency and distributed computing. - Foundations: logic and semantics, rewrite systems and narrowing, type theory, proof systems. - Implementation issues: compilation techniques, memory management, program analysis and transformation, partial evaluation, parallelism. - Applications: case studies, real-world applications, graphical user interfaces, Internet applications, XML, databases, formal methods and model checking. The proceedings will be published as an LNCS volume. The proceedings of the previous meeting (FLOPS 2010) were published as LNCS 6009. PC co-Chairs ============ - Tom Schrijvers (Ghent University, Belgium) - Peter Thiemann (University of Freiburg, Germany) PC Members ========== - Salvador Abreu (University of Evora, Portugal) - Thorsten Altenkirch (University of Nottingham, UK) - Sebastian Brand (NICTA, Australia) - Giuseppe Castagna (CNRS Univ Paris 7, France) - Sebastian Fischer (Germany) - Marco Gavanelli (University of Ferrara, Italy) - Joxan Jaffar (National University of Singapore, Singapore) - Barry Jay (University of Sydney, Australia) - Andy King (University of Kent, UK) - Claude Kirchner (INRIA, France) - Neelakantan R. Krishnaswami (Microsoft Cambridge, UK) - Yulya Lierler (University of Kentucky, USA) - Keiko Nakata (Tallinn University of Technology, Estonia) - Peter Schneider-Kamp (University of Southern Denmark, Denmark) - Olin Shivers (Northeastern University, USA) - Paul Tarau (University of Northern Texas, USA) - Kazunori Ueda (Waseda University, Japan) - Meng Wang (Chalmers Technical University, Sweden) General Chair and Local co-Chairs ================================= - Naoyuki Tamura (Kobe University, Japan) - Mutsunori Banbara (Kobe University, Japan) - Katsutoshi Hirayama (Kobe University, Japan) Submission ========== Submissions must be unpublished and not submitted for publication elsewhere. Work that already appeared in unpublished or informally published workshops proceedings may be submitted. Submissions should fall into one of the following categories: - Regular research papers: they should describe new results and will be judged on originality, correctness, and significance. - System descriptions: they should contain a link to a working system and will be judged on originality, usefulness, and design. Submissions must be written in English and can be up to 15 pages long, though pearls are typically considerably shorter. Authors are required to use LaTeX2e and the Springer llncs class file, available at [http://www.springer.de/comp/lncs/authors.html] Regular research papers should be supported by proofs and/or experimental results. In case of lack of space, this supporting information should be made accessible otherwise (e.g., a link to a web page, or an appendix). Papers should be submitted electronically at [https://www.easychair.org/conferences/?conf=flops2012] Important Dates =============== - Submission deadline : December 16, 2011 (EXTENDED) - Author notification : February 3, 2012 - Camera-ready copy : March 2, 2012 Place and Related Events ======================== Takikawa Memorial Hall, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501 Japan. The 23rd International Conference on Rewriting Techniques and Applications (RTA 2012) and satellite workshops including WFLP 2012 will be held in the week after FLOPS at Nagoya, Japan. Some Previous FLOPS =================== - FLOPS 2010, Sendai: [http://www.kb.ecei.tohoku.ac.jp/flops2010/] - FLOPS 2008, Ise: [http://www.math.nagoya-u.ac.jp/~garrigue/FLOPS2008/] - FLOPS 2006, Fuji Susono: [http://hagi.is.s.u-tokyo.ac.jp/FLOPS2006/] Sponsors ======== - Japan Society for Software Science and Technology (JSSST) SIGPPL In Cooperation with =================== - ACM SIGPLAN - Asian Association for Foundation of Software (AAFS) - Association for Logic Programming (ALP)

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Re: [Haskell-cafe] How to get a file path to the program invoked?
by dokondr 05 Dec '11

05 Dec '11

This is how I finally solved this problem for POSIX complaint system: -- -- TestRun -- module Main where import System.Cmd (rawSystem) import System.Directory (getCurrentDirectory) import System.Environment.Executable (ScriptPath(..), getScriptPath) import System.FilePath.Posix (splitFileName) main = do path <- getMyPath putStrLn $ "myPath = " ++ path let cmdLine = path ++ "args.sh" rawSystem cmdLine ["iphone", "test-twitts.txt"] {-- data ScriptPath Source Constructors: Executable FilePath it was (probably) a proper compiled executable RunGHC FilePath it was a script run by runghc/runhaskell Interactive we are in GHCi --} getMyPath = do curDir <- getCurrentDirectory -- from System.Directory scriptPath <- getScriptPath -- from System.Environment.Executable let path = getMyPath' scriptPath curDir return path getMyPath' (Executable path) _ = fst (splitFileName path) getMyPath' (RunGHC path) _ = fst (splitFileName path) getMyPath' Interactive curDir = curDir++"/" -- All the best, Dmitri O. Kondratiev "This is what keeps me going: discovery" dokondr(a)gmail.com http://sites.google.com/site/dokondr/welcome

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