July 2014 - Haskell-Cafe

help with some code
by gbwey9 12 Jul '14

12 Jul '14

Hi Cafe, I've got some code where a user can provide a filter to subscribe to a particular type of event. The events come in as xml and are parsed using the toEvent method. The code works fine but is repetitive since each event record potentially has the information needed to parse the xml using the field names and types. So is there a way to get rid of the repetition and streamline the code? Should I be using TH or lenses or something else entirely? Here is the paste. http://lpaste.net/107338 Thanks for any pointers! Grant

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regular-xmlpickler
by gbwey9 12 Jul '14

12 Jul '14

Hi, I am using a very cool package called regular-xmlpickler. Does anyone know of a way to skip one level of nesting for nested complex fields? So I would like to elide that outer/inner Header. Here is the full code: http://lpaste.net/107362 data User = User { name :: String , admin :: Bool , dt :: UTCTime , header :: Header } data Header = Header { header1 :: String , header2 :: String } so instead of generating <header> twice <header> <header> <header1>abb</header1> <header2>abb</header2> </header> </header> I would like to have it generate this. <header> <header1>abb</header1> <header2>abb</header2> </header> Thanks, Grant

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Re: [Haskell-cafe] [Haskell] ANNOUNCE: GHC version 7.8.3
by Henk-Jan van Tuyl 11 Jul '14

11 Jul '14

On Fri, 11 Jul 2014 15:40:54 +0200, Austin Seipp <austin(a)well-typed.com> wrote: > Included in this email is a signed copy of the SHA256 hashes for the > tarballs, using my GPG key (keyid 0x3B58D86F). Where can I find your public key? Regards, Henk-Jan van Tuyl -- Folding@home What if you could share your unused computer power to help find a cure? In just 5 minutes you can join the world's biggest networked computer and get us closer sooner. Watch the video. http://folding.stanford.edu/ http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming --

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Haskell Platform release schedule?
by Dominick Samperi 11 Jul '14

11 Jul '14

The Haskell Platform wiki page says the platform follows a 6-month release schedule, yet the last release occurred more than one year ago, and I couldn't find information about future plans. Are there plans to update the platform with ghc 7.8.2? Thanks, Dominick

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Embedding version info in executables
by Roman Cheplyaka 11 Jul '14

11 Jul '14

What are existing solutions for embedding version info (git revision, build date/time, versions of dependencies) in Haskell programs? Roman

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OCL 2014: Submission Deadline Extended by One Week
by Achim D. Brucker 11 Jul '14

11 Jul '14

(Apologies for duplicates) ************************************************************** ** Submission Deadline Extended to July 18th, 2014 ** ************************************************************** CALL FOR PAPERS 14th International Workshop on OCL and Textual Modeling Applications and Case Studies (OCL 2014) Co-located with ACM/IEEE 17th International Conference on Model Driven Engineering Languages and Systems (MODELS 2014) September 30, 2014, VALENCIA, SPAIN http://www.software.imdea.org/OCL2014/ Modeling started out with UML and its precursors as a graphical notation. Such visual representations enable direct intuitive capturing of reality, but some of their features are difficult to formalize and lack the level of precision required to create complete and unambiguous specifications. Limitations of the graphical notations encouraged the development of text-based modeling languages that either integrate with or replace graphical notations for modeling. Typical examples of such languages are OCL, textual MOF, Epsilon, and Alloy. Textual modeling languages have their roots in formal language paradigms like logic, programming and databases. The goal of this workshop is create a forum where researchers and practitioners interested in building models using OCL or other kinds of textual languages can directly interact, report advances, share results, identify tools for language development, and discuss appropriate standards. In particular, the workshop will encourage discussions for achieving synergy from different modeling language concepts and modeling language use. The close interaction will enable researchers and practitioners to identify common interests and options for potential cooperation. Topics of interest include (but are not limited to) =================================================== - Mappings between textual modeling languages and other languages/formalisms - Algorithms, evaluation strategies and optimizations in the context of textual modeling languages for -- validation, verification, and testing, -- model transformation and code generation, -- metamodeling and DSLs, and -- query and constraint specifications - Alternative graphical/textual notations for textual modeling languages - Evolution, transformation and simplification of textual modeling expressions - Libraries, templates and patterns for textual modeling languages - Complexity results for textual modeling languages - Quality models and benchmarks for comparing and evaluating textual modeling tools and algorithms - Successful applications of textual modeling languages - Case studies on industrial applications of textual modeling languages - Experience reports -- usage of textual modeling languages and tools in complex domains, -- usability of textual modeling languages and tools for end-users - Empirical studies about the benefits and drawbacks of textual modeling languages - Innovative textual modeling tools - Comparison, evaluation and integration of modeling languages - Correlation between modeling languages and modeling tasks This year, we particularly encourage submissions describing applications and case studies of textual modeling as well as test suites and benchmark collections for evaluating textual modeling tools. Venue ===== The workshop will be organized as a part of MODELS 2014 Conference in Valencia, Spain. It continues the series of OCL workshops held at UML/MODELS conferences: York (2000), Toronto (2001), San Francisco (2003), Lisbon (2004), Montego Bay (2005), Genova (2006), Nashville (2007), Toulouse (2008), Denver (2009), Oslo (2010), Zurich (2011, at the TOOLs conference), 2012 in Innsbruck, and 2013 in Miami. Similar to its predecessors, the workshop addresses both people from academia and industry. The aim is to provide a forum for addressing integration of OCL and other textual modeling languages, as well as tools for textual modeling, and for disseminating good practice and discussing the new requirements for textual modeling. Workshop Format =============== The workshop will include short (about 15 min) presentations, parallel sessions of working groups, and sum-up discussions. Submissions =========== Two types of papers will be considered: * short papers (6 pages) and * full papers (10 pages) in LNCS format. Submissions should be uploaded to EasyChair (https://www.easychair.org/conferences/?conf=ocl2014) The program committee will review the submissions (minimum 2 reviews per paper, usually 3 reviews) and select papers according to their relevance and interest for discussions that will take place at the workshop. Accepted papers will be published online in a pre-conference edition of CEUR (http://www.ceur-ws.org) Authors of selected papers will be invited to submit an extended version of their workshop paper to a special issue of the Electronic Communications of the EASST (http://journal.ub.tu-berlin.de/eceasst) Important Dates =============== Submission of papers: July 18, 2014 (extended) Notification: August 8, 2014 Workshop date: September 30, 2014 Organizers ========== Achim D. Brucker, SAP AG, Germany Carolina Dania, IMDEA Software Institute, Madrid, Spain Geri Georg, Colorado State University, Fort Collins, Colorado, USA Martin Gogolla, University of Bremen, Germany Programme Committee =================== Michael Altenhofen, SAP AG, Germany Thomas Baar, University of Applied Sciences Berlin, Germany Mira Balaban, Ben-Gurion University of the Negev, Israel Tricia Balfe, Nomos Software, Ireland Fabian Buettner, Ecole des Mines de Nantes, France Achim D. Brucker, SAP AG, Germany Jordi Cabot, INRIA-Ecole des Mines de Nantes, France Yoonsik Cheon, University of Texas, USA Dan Chiorean, Babes-Bolyai University, Romania Robert Clariso, Universitat Oberta de Catalunya, Spain Tony Clark, Middlesex University, UK Manuel Clavel, IMDEA Software Institute, Madrid, Spain Carolina Dania, IMDEA Software Institute, Madrid, Spain Birgit Demuth, Technische Universitat Dresden, Germany Marina Egea, Atos Research, Madrid, Spain Geri Georg, Colorado State University, Fort Collins, Colorado, USA Martin Gogolla, University of Bremen, Germany Pieter Van Gorp, Eindhoven University of Technology, The Netherlands Heinrich Hussmann, LMU Munchen, Germany Tihamer Levendovszky, Vanderbilt University, USA Shahar Maoz, Tel Aviv University, Israel Istvan Rath, Budapest University of Technology and Economics, Hungary Bernhard Rumpe, RWTH Aachen, Germany Shane Sendall, Snowie Research SA, Switzerland Michael Wahler, ABB Switzerland Ltd Corporate Research, Switzerland Claas Wilke, Technische Universitat Dresden, Germany Edward Willink, Willink Transformations Ltd., UK Burkhart Wolff, Univ Paris-Sud, France Steffen Zschaler, King’s College, London, UK -- Dr. Achim D. Brucker, SAP SE, Vincenz-Priessnitz-Str. 1, D-76131 Karlsruhe Phone: +49 6227 7-52595, http://www.brucker.ch/

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ANN: FFI bindings to cuBLAS and cuSPARSE
by Ben Sherman 11 Jul '14

11 Jul '14

I have written FFI bindings to the cuBLAS and cuSPARSE libraries, which are CUDA libraries for executing linear algebra computations on the GPU. It's a relatively straightforward translation of the C API. It's slightly novel in that I use language-c and Template Haskell to parse the C headers and create the FFI declarations, avoiding the boilerplate that may otherwise be necessary, even using a preprocessor such as c2hs. http://hackage.haskell.org/package/cublas-0.2.0.0 I've done a similar thing with a subset of the MAGMA GPU library. It's less polished, and the installation process is more unforgiving, so I haven't put it up on Hackage. https://github.com/bmsherman/magma-gpu Finally, I've written a library which abstracts the immutable API of hmatrix and provides a pure, hmatrix-like interface for cuBLAS/MAGMA, enabling simultaneous development of linear algebra programs using either hmatrix or the above GPU bindings as backends. Additionally, I have written "medium-level" mutable and immutable interfaces to cuBLAS/MAGMA (in LinAlg-magma). I use a type system trick reminiscent of the ST monad to allow mutable operations to read from either immutable or mutable datatypes, so it is easy to mix pure and destructive computations in a safe manner. I really made these libraries only complete enough to suit my purposes; I imagine many improvements can be made. https://github.com/bmsherman/LinAlg https://github.com/bmsherman/LinAlg-magma https://github.com/bmsherman/LinAlg-hmatrix Any feedback, bug reports, or pull requests are most welcome!

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Meetup - Calling all haskellers from Croatia
by Deni Bertović 10 Jul '14

10 Jul '14

We've opened a meetup group for all haskellers from Croatia and someone suggested we should post info about it here as it might reach more interested people that way. Here's the link to the meetup group (please join): http://www.meetup.com/haskellzg/ Sorry for the spam if this doesn't apply to you. -Deni

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Re: [Haskell-cafe] Taking over setlocale
by Clint Adams 10 Jul '14

10 Jul '14

On Tue, Jul 08, 2014 at 03:41:00PM +0200, Sven Bartscher wrote: > To solve this problem, I rewrote the setlocale binding with the same API > under the BSD3-clause. Have you considered submitting this as a patch to the unix package, since setlocale() is POSIX?

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security update practice?
by Mark Wotton 09 Jul '14

09 Jul '14

Hi all, there was a security update to the underlying library to one of my bindings last night (lz4) and it got me thinking - how do we handle security updates as a community? I typically find out from IRC or twitter now, which isn't particularly reliable. Might it be possible to mark an update on Hackage as a security update rather than feature update? cheers Mark -- A UNIX signature isn't a return address, it's the ASCII equivalent of a black velvet clown painting. It's a rectangle of carets surrounding a quote from a literary giant of weeniedom like Heinlein or Dr. Who. -- Chris Maeda

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