November 2008 - Libraries

Version 1.0.0 of Haskell "port" of Google Protocol-Buffers
by Chris Kuklewicz 15 Nov '08

15 Nov '08

Hello one and all, Amid much editing, my Haskell version of protocol-buffer is now released at version 1.0.0. This version supports the feaures of Google's version 2.0.2 including the new extensible options. What is this for? What does it do? Why? It generates Haskell data types that can be converted back and forth to lazy ByteStrings that interoperate with Google's generated code in C++/Java/python. The data types are defined in a ".proto" text file which is translated into the target language. My code is a pure Haskell re-implementation of the Google code at http://code.Google.com/apis/protocolbuffers/docs/overview.html which is "...a language-neutral, platform-neutral, extensible way of serializing structured data for use in communications protocols, data storage, and more." Google's project produces C++, Java, and Python code. This one produces Haskell code. Where is the code? http://hackage.haskell.org/cgi-bin/hackage-scripts/package/protocol-buffers http://hackage.haskell.org/cgi-bin/hackage-scripts/package/protocol-buffers… http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hprotoc-1.0.0 And it needs to be build and installed in the above order. The first is the support library (Text.ProtocolBuffers). The second is the self-describing descriptor library (Text.DescriptorProtos[.Options]). The third is the 'hprotoc' executable which translates the ".proto" files into Haskell code. This works similarly to the "protoc" program from the original Google project. Cheers, Chris

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HsOpenSSL Build Failure
by R Hayes 15 Nov '08

15 Nov '08

I'm trying to build HsOpenSSL-0.4.2 under 6.10.1. The build fails out of the box due to GHC.Prim now being in package ghc-prim. I added ghc- prim to the Cabal file and ran the build. It fails as follows: [12 of 29] Compiling OpenSSL.BN ( dist/build/OpenSSL/BN.hs, dist/ build/OpenSSL/BN.o ) OpenSSL/BN.hsc:172:29: Not in scope: data constructor `S#' OpenSSL/BN.hsc:173:34: Not in scope: data constructor `S#' OpenSSL/BN.hsc:183:23: Not in scope: data constructor `J#' OpenSSL/BN.hsc:184:28: Not in scope: data constructor `J#' OpenSSL/BN.hsc:203:13: Not in scope: data constructor `S#' OpenSSL/BN.hsc:218:15: Not in scope: data constructor `J#' Any advice?

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Arch Haskell News: Nov 2 - Nov 15, 2008
by Don Stewart 15 Nov '08

15 Nov '08

News about Haskell on Arch Linux http://archhaskell.wordpress.com/2008/11/15/arch-haskell-news-nov-15-2008/ Arch now has 705 Haskell packages in AUR. That’s an increase of (again) 33 new packages in the last 14 days. Growth appears to be holding steady at just over 2 new packages a day on Hackage in the first part of November. Noteworthy * haskell-icalendar-0.0: “Parser for iCalendar format (RFC2445)” * haskell-hmatrix-0.5.0.1: “Linear algebra and numerical computations” * haskell-flickr-0.2.2: “Haskell binding to the Flickr API” * gitit-0.2.2.1: “Wiki using HAppS, git, and pandoc.” * haskell-happs-server-0.9.3: “Web related tools and services.” * haddock-2.4.1: “A documentation-generation tool for Haskell libraries” And lots of others.

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Language.{Java,JVM} ?
by Johannes Waldmann 11 Nov '08

11 Nov '08

We have Language.Haskell and Language.C - is there something similar for Java as well? For JVM Bytecode? Any hints appreciated - J.W.

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URL for latest package version?
by Conal Elliott 10 Nov '08

10 Nov '08

Now that hackage has caught up with ghc versions, I'd like my HaskellWiki project pages to link to hackage-based haddock docs instead of the docs I generate myself. (Hooray for inter-package doc links!) However, I don't know how to link to the latest version, rather than a specific one, such as http://hackage.haskell.org/packages/archive/vector-space/0.5/doc/html/Data-… Is there a trick that will help me out? Thanks, - Conal

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parsec 3 vs. 2 - what's the deal?
by Johannes Waldmann 10 Nov '08

10 Nov '08

Hello. Should I migrate from parsec-2 to parsec-3? Why? And if yes, then how? The hackage description (of version 3) says "it's well documented ... on the home page", but when I go there, I find docs for version 2 only. If I'm still using parsec-2 for teaching, will this harm my students? J.W.

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Hello
by Dave Tapley 07 Nov '08

07 Nov '08

Hi everyone, Just signed up to the list having attended the London HUG meet yesterday. You'll see me in #haskell as DukeDave. Looking forwards to helping with any menial non-expert tasks to help get some a Haskell platform up :) Dave,

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darcs patch: Added list operations for arrows
by Peter Collingbourne 05 Nov '08

05 Nov '08

Hello, This patch adds two arrow combinators which I have found useful: mapA (equivalent of map) and filterA (equivalent of filter). Thu Oct 30 16:50:02 GMT 2008 Peter Collingbourne <pcc03(a)doc.ic.ac.uk> * Added list operations for arrows Thanks, -- Peter

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System[.Posix].Process question
by Johannes Waldmann 05 Nov '08

05 Nov '08

Hello. I am looking for something like System.Process.runInteractiveProcess (which gives me the in/out/err handles, which I like) but instead of ProcessHandle, I want a System.Posix.Types.ProcessID because I want to send a specific signal later. It seems that to a ProcessHandle I can only send SIGKILL (via System.Process.terminateProcess), and this is bad because the target process cannot intercept and handle it. In my case, it needs to cleanup (namely, kill its children). Thanks, J.W.

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Arch Haskell News: Nov 02 2008
by Don Stewart 03 Nov '08

03 Nov '08

News about the Haskell packages for Arch Linux. Highlights, * 672 Haskell packages now supported in Arch Linux, up 33 from two weeks ago. Noteworthy, * haskell-tcache-0.5.3: “A Transactional data cache with configurable persistence” * haskell-yampa-0.9.2.3: “Library for programming hybrid systems.” * haskell-network-bytestring-0.1.1.3: “Fast and memory efficient low-level networking” * haskell-checkers-0.1.1: “Check properties on standard classes and data structures.” * haskell-coreerlang-0.0.1: “Facilities for manipulating Core Erlang source code: an abstract syntax, parser and pretty-printer.” Full update list, http://archhaskell.wordpress.com/2008/11/03/arch-haskell-news-nov-02-2008/ -- Don How's your favourite distro doing? If its not up to scratch, talk to someone.

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