[Haskell-cafe] Haskell Weekly News: Issue 115 - April 25, 2009
Brent Yorgey
byorgey at seas.upenn.edu
Sat Apr 25 17:57:21 EDT 2009
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Haskell Weekly News
http://sequence.complete.org/hwn/20090425
Issue 115 - April 25, 2009
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Welcome to issue 115 of HWN, a newsletter covering developments in the
[1]Haskell community.
By all reports, the [2]5th Haskell Hackathon was a resounding success,
with over 50 hackers present and many interesting Haskell projects
worked on!
Announcements
darcs hacking sprint 2 and hac5 report. Eric Kow [3]sent out a link to
a [4]report on the second darcs hacking sprint, held as part of the
Haskell Hackathon.
HPong-0.1.2: A simple OpenGL Pong game based on GLFW. R.A. Niemeijer
[5]announced the release of [6]HPong, a simple Pong game implemented
using OpenGL and GLFW.
Hac5 roundup. Martijn van Steenbergen [7]reported on the 5th Haskell
Hackathon. See the [8]wiki page for details, pictures, and links to
blog posts.
HTTP-4000.0.6. Sigbjorn Finne [9]announced a new release of the
[10]HTTP package, which adds more robust handling of ill-formed
cookies, and fixes a bug in normalization of certain proxy-bound
requests.
dataenc 0.12.1.0. Magnus Therning [11]announced version 0.12.1.0 of the
[12]dataenc package. This version adds a bunch of new encodings,
including xxencode, hexadecimal, quoted-printable, python escaping, and
url encoding; and also fixed some bugs.
list-tries-0.0 - first release. Matti Niemenmaa [13]announced the first
public release of [14]list-tries, a library providing implementations
of finite sets and maps for list keys using tries, both simple and of
the Patricia kind. The data types are parametrized over the map type
they use internally to store the child nodes: this allows extending
them to support different kinds of key types or increasing efficiency.
curl-1.3.5. Sigbjorn Finne [15]announced a new release of the [16]curl
package, which provides Haskell bindings to libcurl. It works with ghc
6.10.2, taking into account the updated story on how to register
Haskell-based finalizers.
Runge-Kutta library -- solve ODEs. Uwe Hollerbach [17]announced a
[18]Runge-Kutta library for numerically solving ordinary differential
equations.
funsat-0.6. Denis Bueno [19]announced version 0.6 of [20]funsat, a
modern, DPLL-style SAT solver written in Haskell. Funsat solves
formulas in conjunctive normal form and produces a total variable
assignment for satisfiable problems. Version 0.6 adds a representation
for logical circuits (and, or, not, onlyif, iff, if-then-else)
supporting efficient conversion to CNF, and now uses the BSD3 license.
control-monad-exception-0.1: Explicitly typed exceptions. Pepe Iborra
[21]announced the [22]control-monad-exception package, which provides
explicitly typed exceptions for Haskell. The type of a computation in
the EM monad carries a list of the exceptions that the computation may
throw. A exception is raised with 'throw', which in addition adds it to
the type, and captured with 'catch', which correspondingly removes it
from the type. Only safe computations (all exceptions handled) can
escape from the monad.
Haskell Implementers' Workshop 2009 (co-located with ICFP). Simon
Marlow [23]issued a call for talks to be given at the ACM SIGPLAN
[24]Haskell Implementers' Workshop, to be held on September 3 in
Edinburgh, Scotland, in conjunction with [25]ICFP 2009. The proposal
deadline in 15 June. The Haskell Implementers Workshop is a new
workshop to be held alongside ICFP 2009 this year in Edinburgh,
Scotland. There will be no proceedings; it is an informal gathering of
people involved in the design and development of Haskell
implementations, tools, libraries, and supporting infrastructure.
persistent-map-0.0.0. Peter Robinson [26]announced the
[27]persistent-map package, which provides a thread-safe (STM) frontend
for finite map types together with a backend interface for persistent
storage.
A pragmatic Haskell .NET interop layer, 0.4.0. Sigbjorn Finne
[28]announced a new release of [29]hs-dotnet, a Haskell .NET interop
layer. It lets you access .NET functionality from Haskell and vice
versa. The new version includes development done since the start of the
year. Apart from rewriting the internals completely to put it all on a
sounder footing, this release includes proper support for .NET generic
types (classes and interfaces), mapping them naturally on to Haskell
parameterized types.
Utrecht Haskell Compiler (UHC) -- first release. atze [30]announced the
first public release of the [31]Utrecht Haskell Compiler (UHC). UHC
supports almost all Haskell98 features plus many experimental
extensions. The compiler runs on MacOSX, Windows (cygwin), and various
Unix flavors. Features include multiple backends, including a bytecode
interpreter backend and a GRIN based, full program analysing backend;
experimental language extensions, some of which have not been
implemented before; implementation via attribute grammars and other
high-level tools; and ease of experimentation with language variants,
thanks to an aspect-oriented internal organisation.
6.10.3 plans. Ian Lynagh [32]announced plans for a 6.10.3 release of
GHC, in order to fix the handling of ^C in ghci. 6.10.3 will also use
haskeline instead of editline.
A HERE Document syntax. Jason Dusek [33]proposed a lightweight syntax
for HERE documents in Haskell.
Discussion
Functor and Haskell. Daryoush Mehrtash [34]asked about the link between
functors in category theory and Haskell's Functor class; the resulting
thread is a good introduction to the connections between Haskell and
category theory for those just learning the latter.
breaking too long lines. Christian Maeder [35]asked how to break long
lines in Haskell source, leading to an interesting discussion of coding
style.
Jobs
Haskell consultant wanted to develop small, Mac-based utility in
Haskell or AppleScript. R J [36]announced an opportunity to develop a
short program to annotate lists of words with their definitions.
Blog noise
[37]Haskell news from the [38]blogosphere.
* Twan van Laarhoven: [39]Where do I get my non-regular types?.
* Sebastian Fischer: [40]Reinventing Haskell Backtracking.
* Darcs: [41]darcs hacking sprint #2 report.
* Well-Typed.Com: [42]Platform progress and the Hackathon.
* Roman Cheplyaka: [43]Hac5: the rest of the story (almost).
* Twan van Laarhoven: [44]A non-regular data type challenge.
* Magnus Therning: [45]dataenc 0.12.1.0 released.
* Galois, Inc: [46]Portland Next Week: ICFP PC Functional Programming
Workshop.
* Christophe Poucet (vincenz): [47]Flattening Data.Map.
* Roman Cheplyaka: [48]Hac5: second day.
* Xmonad: [49]contribs review.
* GHC / OpenSPARC Project: [50]Loose ends and register pairing.
* Sean Leather: [51]Latest on the incremental fold and attributes.
* >>> Matthew Podwysocki: [52]Functional Solution for the Shortest
Path Problem .
* Chris Smith: [53]Code for Manipulating Graphs in Haskell.
* Austin Seipp: [54]A little fun with Haskabelle. Proving things
about *existing* Haskell code in Isabelle.
* Tupil: [55]Running Happstack applications with FastCGI.
* Martijn van Steenbergen: [56]Hac5-Saturday.
* beelsebob: [57]Bottoms.
* Antoine Latter: [58]Using Haskeline.
* Darcs: [59]darcs weekly news #26.
* Martijn van Steenbergen: [60]Hacking GHC-What I've learned.
* >>> Brandon Simmons: [61]Initial tests of Tries: Follow Up.
* >>> Lab 49: [62]The Algebra of Data, and the Calculus of Mutation.
* Martijn van Steenbergen: [63]Hac5-Friday. Pictures from the
Hackathon.
* >>> Matthew Podwysocki: [64]Haskell and Collective Intelligence .
Quotes of the Week
* Gracenotes: foldr chosen for its magical evil terminating powers
* uninverted: Moving from lisp to haskell with respect to functions
is like moving from c to perl with respect to strings.
* Berengal: [On infinitely fast computers] The OS probably has a
failsafe built in: If a program is running it's in an infinite loop
and needs to be killed...
* nikki93: After a bit more delving, I've come to see the power of
haskell at last. You have to treat functions like crap, forget
about the C idea that they're 'big things'. They're not.
* Berengal: I was squashing a bug, got frustrated, and typed "fix
error" in ghci...
About the Haskell Weekly News
New editions are posted to [65]the Haskell mailing list as well as to
[66]the Haskell Sequence and [67]Planet Haskell. [68]RSS is also
available, and headlines appear on [69]haskell.org.
To help create new editions of this newsletter, please see the
information on [70]how to contribute. Send stories to byorgey at cis
dot upenn dot edu. The darcs repository is available at darcs get
[71]http://code.haskell.org/~byorgey/code/hwn/ .
References
1. http://haskell.org/
2. http://www.haskell.org/haskellwiki/Hac5
3. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57551
4. http://blog.darcs.net/2009/04/darcs-hacking-sprint-2-report.html
5. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57493
6. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HPong
7. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57470
8. http://www.haskell.org/haskellwiki/Hac5
9. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57336
10. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/HTTP
11. http://article.gmane.org/gmane.comp.lang.haskell.libraries/10945
12. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/dataenc
13. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57311
14. http://iki.fi/matti.niemenmaa/list-tries/
15. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57251
16. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/curl
17. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57160
18. http://www.korgwal.com/software/rk-1.0.0.tar.gz
19. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57101
20. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/funsat
21. http://article.gmane.org/gmane.comp.lang.haskell.general/17120
22. http://article.gmane.org/gmane.comp.lang.haskell.general/17120
23. http://article.gmane.org/gmane.comp.lang.haskell.general/17113
24. http://haskell.org/haskellwiki/HaskellImplementorsWorkshop
25. http://www.cs.nott.ac.uk/~gmh/icfp09.html
26. http://article.gmane.org/gmane.comp.lang.haskell.general/17106
27. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/persistent-map
28. http://article.gmane.org/gmane.comp.lang.haskell.general/17105
29. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hs%2Ddotnet
30. http://article.gmane.org/gmane.comp.lang.haskell.general/17103
31. http://www.cs.uu.nl/wiki/UHC
32. http://article.gmane.org/gmane.comp.lang.haskell.glasgow.user/16792
33. http://article.gmane.org/gmane.comp.lang.haskell.prime/2787
34. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/57324
35. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/57207
36. http://article.gmane.org/gmane.comp.lang.haskell.cafe/57568
37. http://planet.haskell.org/
38. http://haskell.org/haskellwiki/Blog_articles
39. http://twan.home.fmf.nl/blog/haskell/non-regular2.details
40. http://www-ps.informatik.uni-kiel.de/~sebf/pub/atps09.html
41. http://blog.darcs.net/2009/04/darcs-hacking-sprint-2-report.html
42. http://blog.well-typed.com/2009/04/platform-progress-and-the-hackathon/
43. http://ro-che.blogspot.com/2009/04/hac5-rest-of-story-almost.html
44. http://twan.home.fmf.nl/blog/haskell/non-regular1.details
45. http://therning.org/magnus/archives/568
46. http://www.galois.com/blog/2009/04/23/portland-next-week-icfp-pc-functional-programming-workshop/
47. http://cpoucet.wordpress.com/2009/04/18/flattening-datamap/
48. http://ro-che.blogspot.com/2009/04/hac5-second-day.html
49. http://xmonad.wordpress.com/2009/04/22/contribs-review/
50. http://ghcsparc.blogspot.com/2009/04/loose-ends-and-register-pairing.html
51. http://feedproxy.google.com/~r/splonderzoek/~3/KWqNCgsK1ww/latest-on-incremental-fold-and.html
52. http://codebetter.com/blogs/matthew.podwysocki/archive/2009/04/21/functional-solution-for-the-shortest-path-problem.aspx
53. http://cdsmith.wordpress.com/2009/04/20/code-for-manipulating-graphs-in-haskell/
54. http://www.jedi-ninja.net/2009/04/20/A-little-fun.html
55. http://blog.tupil.com/running-happstack-applications-with-fastcgi/
56. http://martijn.van.steenbergen.nl/journal/2009/04/19/hac5-saturday/
57. http://noordering.wordpress.com/2009/04/19/bottoms/
58. http://panicsonic.blogspot.com/2009/04/using-haskeline.html
59. http://blog.darcs.net/2009/04/darcs-weekly-news-26.html
60. http://martijn.van.steenbergen.nl/journal/2009/04/18/hacking-ghc-what-ive-learned/
61. http://coder.bsimmons.name/blog/2009/04/initial-tests-of-tries-follow-up/
62. http://blog.lab49.com/archives/3011
63. http://martijn.van.steenbergen.nl/journal/2009/04/17/hac5-friday/
64. http://codebetter.com/blogs/matthew.podwysocki/archive/2009/04/17/haskell-and-collective-intelligence.aspx
65. http://www.haskell.org/mailman/listinfo/haskell
66. http://sequence.complete.org/
67. http://planet.haskell.org/
68. http://sequence.complete.org/node/feed
69. http://haskell.org/
70. http://haskell.org/haskellwiki/HWN
71. http://code.haskell.org/~byorgey/code/hwn/
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