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Latest revision as of 13:11, 17 December 2012
 1 Generic information
You can apply for an account and a project using the community server.
Once you have an account and/or a project, you upload a Darcs repository as follows. First, initialize your repository on the server:
$ ssh community.haskell.org you@haskell:~$ cd /srv/code/yourproject you@haskell:/srv/code/yourproject$ darcs init
Then, log out and push your repository:
$ darcs push community.haskell.org:/srv/code/yourproject
 2 Demonstrations
The following demos where held:
* Jutaro, Leksah: the Haskell IDE * Don Stewart, vacuum + adaptive data structures * Tupil.com / chr1s: Real World Web Apps in Haskell * Thorkil Naur, interactive, time-sliced HPC code coverage * David Himmelstrup, the LHC Haskell Compiler.
 3 Projects
If you have a project that you want to work on at the Hackathon, please describe it here.
Since Hackathons are great for teamwork, consider joining one of the projects mentioned below. If you're interested in one of these projects, add your name to the list of hackers under that project.
 3.1 Haskell Platform 1.0
Finish the construction and roll out of the new Haskell Platform
 3.1.1 Hackers
- Chris Eidhof (chr1s)
Platform specified, generic unix tarball installer.
 3.1.2 Gentoo Linux
Package the haskell platform and put into portage.
Progress: All libraries and applications are in portage. GHC-6.10.2, haddock-2.4.2 and parallel-18.104.22.168 are still masked for testing, other packages are usable with older ghc versions.
 3.2 Darcs Sprint #2
 3.2.1 Description
 3.2.2 Hackers
- Reinier Lamers (tux_rocker)
- Eric Kow (kowey)
- Ben Moseley (benmos)
- Ganesh Sittampalam (Heffalump)
- Ian Lynagh (igloo)
- Arjan Boeijink (arjanb)
- Benedikt Schmidt (beschmi)
- Petr Ročkai (mornfall)
- Thorkil Naur (thorkilnaur)
 3.3 Grapefruit
 3.3.1 Description
Grapefruit is a library for Functional Reactive Programming (FRP) with a focus on user interfaces. FRP makes it possible to implement reactive and interactive systems in a declarative style. With Grapefruit, user interfaces are described as networks of communicating widgets and windows. Communication is done via different kinds of signals which describe temporal behavior.
 3.3.2 Possible subprojects
- graphics support
- improvements of the UI part and the GTK+-based UI backend
- Qt-based UI backend
- HQK should be used for this.
- addition or integration of some kind of physics engine
- There is, for example, Hpysics from Roman Cheplyaka (Feuerbach)
 3.3.3 Licensing
 3.3.4 Hackers
- Wolfgang Jeltsch (jeltsch)
- Fraser Wilson
- Roman Cheplyaka (Feuerbach)
- Peter Verswyvelen
- Thomas Davie
There is a doodle for planning who is doing what.
 3.4 Leksah
 3.4.1 Description
leksah is an attempt to develop a Haskell IDE in Haskell. Help adding cool features to this Wannabee IDE, like:
- Generate export list
- Code Formatter
- Infer types
 3.4.2 Hackers
- Jürgen Nicklisch (jutaro)
 3.5 Scion
 3.5.1 Description
Scion is a library that aims to provide IDE-like functionality on top of the GHC API. It aims to be front-end agnostic, thus serve as a common middle-layer for various Haskell programming frontends like Emacs, Vim, Yi, Eclipse, etc.
It currently only provides rudimentary functionality, such as loading a project and single-threaded background-typechecking. Currently, Scion's only frontend is Emacs, but a Vim frontend is in the underway. Possible Hackathon projects could be:
* Extend Scion's capabilities. For example: cross-refs, jump to source, more type information, show haddock comments
* Add another Scion frontend. E.g., hook up Yi or Eclipse with scion
Update (Sun Dec 13 22:20:03 CET 2009): Vim is supported and scion is that useful that you shouldn't miss it. There are still some features lacking which Eclipse etc provide. You should definitely give it a try!
 3.5.2 Hackers
* Thomas Schilling (nominolo) * David Waern (waern)
 3.6 Type class aliases
 3.6.1 Description
Type class aliases is a much wanted extension to Haskell proposed long ago by John Meacham (John's website, mailing list) that has never been implemented yet. It is time this extension sees the light of day!
Please have a look at the context alias wiki page and extend it if you can.
 3.6.2 Ideas
 22.214.171.124 from Martijn van Steenbergen
As a starting point we'll focus on supporting the following syntax:
class alias FooBar a = (Foo a, Bar a) x :: FooBar a => a x = ...
 126.96.36.199 from Wolfgang Jeltsch
A “class alias” actually doesn’t stand for a class but for a context (or a part of a context). So it might be better to choose a slightly different syntax:
context Foobar a = (Foo a, Bar a)
John Meacham proposes the following syntax for class aliases (context aliases) with superclass constraints:
class alias Num a = Eq a => (Additive a, Multiplicative a)
This is not consistent with the superclass syntax of class declarations. I think, we should use this syntax:
class alias Eq a => Num a = (Additive a, Multiplicative a)
context Eq a => Num a = (Additive a, Multiplicative a)
 3.6.3 Hackers
 3.7 Goals in GHC(i)
 3.7.1 Description
We will attempt to extend GHC(i) to give the type (and possibly context) of all 'undefined's in your code, similar to goals in Agda.
 3.7.2 Hackers
- Sebastiaan Visser
- Tom Lokhorst
- Erik Hesselink
- Rui Barbosa
 3.7.3 Progress
We have a working prototype, and integration in GHCi. Code is available on GitHub , hackage package will follow soon.
 3.8 Containers: beyond Data.Map
Scalable, adaptive persistent container types (Data.Map, Data.IntMap),
- Don Stewart
- Christophe Poucet
- Nicolas Pouillard
Summary of approach here: http://cpoucet.wordpress.com/2009/04/18/flattening-datamap/
 3.9 xmonad
Some new extensions and developers.
- Don Stewart
- Nicolas Pouillard.
 3.10 Building a FastCGI interface for Happstack
We've built a way to run Happstack applications on FastCGI, version 0.1.1 is now on hackage: happstack-fastcgi
Accompanying blogpost: http://blog.tupil.com/running-happstack-applications-with-fastcgi/
- Eelco Lempsink
- Chris Eidhof
 3.11 Yi
Speed improvements and perhaps Scion integration.
- David Waern
Scion integration: Figured out a design for where store and call callbacks for initializing and closing Scion. Next step is to figure out how to avoid circular module dependencies.
- David Himmelstrup (Lemmih)
 3.12 Complexity
I released version 0.1.1 of complexity, a small package to determine the algorithmic complexity of a function.
- Roel van Dijk
 3.13 Numerals
We released version 0.1 of numerals, a package which does various things with numerals for a number of natural languages and numerical systems.
> (cardinal enShort Masculine 42) :: Maybe String Just "forty-two"
- Bas van Dijk
- Roel van Dijk
 3.14 DocTest
- Simon Hengel
David Waern and I discussed how we could integrate DocTest with Haddock.
 4 Experiences
Please list projects with which you are familiar. This way, people know whom to contact for more information or guidance on a particular project.
|sebas||salvia, orchid, filestore|
|waern||GHC (front-end), Haddock|
|npouillard (ertai)||yi, xmonad, darcs|
|chr1s||formlets, sphinx, emgm, HAppS, EHC, web-related stuff|