[Haskell-cafe] Haskell Weekly News: Issue 75 - July 2, 2008
byorgey at seas.upenn.edu
Wed Jul 2 15:42:31 EDT 2008
Haskell Weekly News
Issue 75 - July 02, 2008
Welcome to issue 75 of HWN, a newsletter covering developments in the
Anglo Haskell 2008. Matthew Sackman announced AngloHaskell 2008,
a gathering of all people Haskell-related from beginners, to seasoned
hackers to academic giants. All and more are welcomed by large fuzzy
green lambdas. The proposed dates and location are Friday the 8th and
Saturday the 9th of August, at Imperial College, London.
CFP - Special Issue of Fundamenta Informaticae on Dependently Typed
Programming. Wouter Swierstra announced a call for papers for a
special issue of Fundamenta Informaticae on Dependently Typed
Programming. The deadline for submissions is October 1.
Gtk2Hs 0.9.13. Peter Gavin announced the release of Gtk2Hs 0.9.13,
including bindings for Gnome VFS and GStreamer, a new Gtk+ tutorial
adapted by Hans van Thiel, cairo image stride support, and more.
Hasim. Jochem Berndsen announced Hasim, a small project to create
a library to do discrete event simulation in Haskell, using monads to
define a domain-specific language for "actions" of a process.
Galois move. Don Stewart announced that Galois has completed the
move of its data center. Expect speedier response times for
hackage.haskell.org and darcs.haskell.org.
Google Summer of Code
Progress updates from participants in the 2008 Google Summer of
Hoogle 4. Neil Mitchell (ndm) is working on Hoogle 4. This
week, Neil worked on better Haddock database generation, lazy name
searching, and a snazzy --info flag for Hoogle. Next up: type search!
DPH physics engine. Roman Cheplyaka (Feuerbach) is working on a
physics engine using Data Parallel Haskell. This week, he
worked on implementing Mirtich's V-Clip algorithm for collision
detection (and got it to work), cabalized his project and added
documentation. He also ran into an interesting QuickCheck puzzle.
Generic tries. Jamie Brandon is working on a library for efficient maps
using generalized tries. This week, he created a generic framework
for automatically running QuickCheck tests at a number of different
types. This week he plans to synthesize the many suggestions from the
discussion on the libraries list into a stable API design.
Language.C. Benedikt Huber (visq) is working on Language.C, a
standalone parser/pretty printer library for C99. This week he
worked on a better representation for declarators, and abstracted the
notion of an InputStream over both String and ByteString, among other
GHC plugins. Max Bolingbroke is working on dynamically loaded plugins
Cabal dependency framework. Andrea Vezzosi (Saizan) is working on a
make-like dependency analysis framework for Cabal.
GHC API. Thomas Schilling (nominolo) is working on improvements to
the GHC API. Officials at HWN headquarters have released a statement
reversing their previous position regarding the existence of Thomas,
citing regrettably faulty information to explain their previous
misapprehensions. Expect to hear more from Thomas soon, now that he has
finished graduating and moving.
Proposals and extensions to the standard libraries.
GetOpt formatting improvements. Duncan Coutts proposed some
modifications to make the output of the System.Console.GetOpt library
more readable, resulting in quite a bit of discussion.
HughesPJ improvements. Benedikt Huber proposed a patch with some
bug fixes, performance improvements, and QuickCheck test suite for the
Text.PrettyPrint.HughesPJ pretty-printing library.
A Monad for on-demand file generation?. Joachim Breitner asked
about a monad for transparently tracking files which may need to be
regenerated due to dependencies, leading to an interesting discussion
of incremental computation, strict vs. lazy I/O, and other issues.
New mailing list proposal: Haskell-Edu. Benjamin L. Russell sent out a
message proposing a new mailing list hosted at haskell.org,
"Haskell-Edu: The Haskell Educational Mailing List." The new mailing
list would be guided by the principle that Haskell is useful not just
in research, but also in teaching programming as part of a liberal arts
education. Comments and discussion welcomed.
Learning GADT types to simulate dependent types. Paul Johnson is trying
to use GADTs to simulate aspects of a dependently typed system, and
asks for help improving his Oleg rating.
Call graph tool?. C.M.Brown asked whether there is a tool for
visualizing the call graph for a collection of source files, leading to
a discussion of various tools.
Formal methods and automated reasoning at Rockwell Collins. Janis
Voigtlaender passed on an opening for a Senior Systems Engineer at
Rockwell Collins. The opening is for a computer scientist or
engineer to develop and apply automated analysis to computer systems
and to pursue research in formal methods and automated reasoning.
Contact: rmgatto at rockwellcollins.com.
Haskell news from the blogosphere.
* Roman Cheplyaka: V-Clip seems to work!.
* Benedikt Huber: Last week on Language.C (1). An update on
Benedikt's Google Summer of Code project.
* Jamie Brandon: Week 3 progress. An update on Jamie's Google
Summer of Code project.
* Philip Wadler: Welcome to Scotland, Neil, Patricia, and Conor!.
* >>> codders: Coding style, Haskell. codders likes how Real
World Haskell gives some hints about Haskell coding style and
culture in addition to teaching the language itself.
* >>> zoo: Haskell plug-in for Eclipse. zoo explains how to
install the Haskell Eclipse plugin.
* Dan Piponi (sigfpe): A blessed man's formula for holey
containers. Dan descries an enlightening derivation of the
combinatorial form of Faa di Bruno's formula from the
perspective of derivatives of types.
* Roman Cheplyaka: Status report: week 5. An update on Roman's
Google Summer of Code project.
* >>> codders: More Haskell fun.
* >>> Marco Tulio Gontijo e Silva: Rank 2 Types. Marco describes
a practical use for GHC's rank-2 types.
* Edward Kmett: Memoizing Context.
* >>> JP Moresmau: Deserializing JSON to Haskell Data objects.
* >>> codders: Getting started with Haskell... still. codders is
learning Haskell by reading the beta version of Real World
* Neil Mitchell: GSoC Hoogle: Week 5.
* Arnar: Parsing JSON with Haskell. A nice example of using
Parsec to parse JSON.
* Thomas Hartman: HAppS Tutorial.
Quotes of the Week
* quicksilver: [on what OS sjanssen uses] sjanssen runs haskell
programs in his head; much more efficient.
* EvilTerran: "We were somewhere around Barstow, on the edge of the
desert, when the phantom types began to take hold."
* audreyt: o/~ the phantom of the typesystem is here / inside my
* dmwit: No, no, no, ($) isn't right-assoc, it's wrong-assoc.
* solrize: this would never happen in haskell: i sent in a search
query to a certain python program, but left the query field empty,
expecting to get back an error message. instead it found a bunch of
books written by the diet doctor Gary Null.
* heatsink: We're all inside do-blocks in the IO monad if you think
* djsiegel: [upon having a question answered by dons] oh my, I'm
talking to the man
* mar77a: the first computers were big because they were actually
cupboards with fast humans inside
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