[Haskell-cafe] Haskell Weekly News: March 05, 2007
Donald Bruce Stewart
dons at cse.unsw.edu.au
Mon Mar 5 00:48:15 EST 2007
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Haskell Weekly News
http://sequence.complete.org/hwn/20070305
Issue 58 - March 05, 2007
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Welcome to issue 58 of HWN, a weekly newsletter covering developments
in the [1]Haskell community.
1. http://haskell.org/
Announcements
New Book - Programming in Haskell. Graham Hutton [2]announced a new
Haskell textbook: [3]Programming in Haskell. This introduction is
ideal for beginner programmers: it requires no previous programming
experience and all concepts are explained from first principles via
carefully chosen examples. Each chapter includes exercises that range
from the straightforward to extended projects, plus suggestions for
further reading on more advanced topics. The presentation is clear and
simple, and benefits from having been refined and class-tested over
several years.
2. http://article.gmane.org/gmane.comp.lang.haskell.general/14849
3. http://www.cs.nott.ac.uk/~gmh/book.html
Gtk2Hs version 0.9.11. Duncan Coutts [4]announced Gtk2Hs - a GUI
Library for Haskell based on Gtk+, version 0.9.11, is [5]now
available. Gtk2Hs features: automatic memory management; Unicode
support; nearly full coverage of Gtk+ 2.8 API; support for several
additional Gtk+/Gnome modules (Glade visual GUI builder, cairo vector
graphics, SVG rendering, OpenGL extension and more).
4. http://article.gmane.org/gmane.comp.lang.haskell.general/14934
5. http://haskell.org/gtk2hs/download/
cabal-make version 0.1. Conal Elliott [6]announced Cabal-make, a GNU
make include file to be used with Cabal in creating and sharing
Haskell packages. A few highlights: web-based, cross-package links in
Haddock docs; syntax coloring via hscolour, with per-project CSS;
links from the Haddock docs to hscolour'd code and to wiki-based user
comment pages. [7]It is available here.
6. http://article.gmane.org/gmane.comp.lang.haskell.general/14891
7. http://haskell.org/haskellwiki/Cabal-make
Vty 3.0.0. Stefan O'Rear [8]announced a new major of [9]vty, featuring
improved performance. vty is notably used in yi to provide a terminal
interface supporting syntax highlighting.
8. http://article.gmane.org/gmane.comp.lang.haskell.general/14876
9. http://members.cox.net/stefanor/vty/dist/doc/html/index.html
Haskell Xcode Plugin. Lyndon Tremblay [10]announced the first release
of [11]a plugin for Xcode enabling Haskell syntax highlighting, Xcode
projects compiling and linking, and a couple missing features, for
Haskell (GHC).
10. http://article.gmane.org/gmane.comp.lang.haskell.general/14875
11. http://www.hoovy.org/HaskellXcodePlugin/
urlcheck 0.1: parallel link checker. Don Stewart [12]announced the
first release of [13]urlcheck, an parallel link checker, written in
Haskell. Frustrated with the resources and time consumed by
'linkchecker', urlcheck is a lightweight, smp-capable replacement in
Haskell. urlcheck pings urls found in the input file, checking they
aren't 404s. It uses Haskell threads to run queries concurrently, and
can transparently utilise multiple cores if you have them.
12. http://article.gmane.org/gmane.comp.lang.haskell.general/14863
13. http://hackage.haskell.org/cgi-bin/hackage-scripts/package/urlcheck-0.1
The Monad.Reader: call for copy. Wouter Swierstra [14]welcomed
articles for the next issue of The Monad.Reader. Submit articles for
the next issue by e-mail before April 13th, 2007. Articles should be
written according to the guidelines available from [15]The Monad
Reader home.
14. http://article.gmane.org/gmane.comp.lang.haskell.general/14870
15. http://www.haskell.org/haskellwiki/TheMonadReader
TV-0.2 and GuiTV-0.2. Conal Elliott [16]announced TV, a library for
composing tangible values ('TVs'), values that carry along external
interfaces. In particular, TVs can be composed to create new TVs, and
they can be directly executed with various kinds of interfaces. Values
and interfaces are combined for direct use, and separable for
composition. GuiTV adds graphical user interfaces to the TV (tangible
value) framework, using Phooey. The functionality was part of TV up to
version 0.1.1, and is now moved out to a new package to eliminate the
dependency of core TV on Phooey and hence on wxHaskell, as the latter
can be difficult to install.
16. http://article.gmane.org/gmane.comp.lang.haskell.general/14862
Haskell-mode 2.2. Stefan Monnier [17]released version 2.2 of [18]the
Haskell-mode package for Emacs. It has very few visible changes,
mostly some commands to query an underlying interactive hugs/ghci in
order to get type/info about specific identifiers.
17. http://article.gmane.org/gmane.comp.lang.haskell.general/14857
18. http://www.iro.umontreal.ca/~monnier/elisp/
Data.CompactString 0.1. Twan van Laarhoven [19]announced a beta
[20]Unicode version of Data.ByteString. The library uses a variable
length encoding (1 to 3 bytes) of Chars into Word8s, which are then
stored in a ByteString.
19. http://thread.gmane.org/gmane.comp.lang.haskell.general/14834
20. http://twan.home.fmf.nl/compact-string/
HSXML version 1.13. Oleg Kiselyov [21]announced version 1.13 of
[22]HSXML. HSXML is a library for writing and transforming typed
semi-structured data in Haskell -- in S-expression syntax, with the
extensible set of `tags', and statically enforced content model
restrictions. A particular application is writing web pages in
Haskell. We obtain HTML, XHTML or other output formats by running the
Haskell web page in an appropriate rendering monad. The benefit of
representing XML-like documents as a typed data structure/Haskell code
is static rejection of bad documents -- not only those with undeclared
tags but also those where elements appear in wrong contexts.
21. http://thread.gmane.org/gmane.comp.lang.haskell.general/14835
22. http://pobox.com/~oleg/ftp/Scheme/xml.html#typed-SXML
Haskell XML Toolbox 7.1. Uwe Schmidt [23]announced a new version of
[24]the Haskell XML Toolbox. The main change is the step from cvs to
darcs. The documentation has source links into [25]the darcs
repository. [26]A tutorial is available in the Haskell wiki.
23. http://article.gmane.org/gmane.comp.lang.haskell.general/14831
24. http://www.fh-wedel.de/~si/HXmlToolbox/index.html
25. http://darcs.fh-wedel.de/hxt
26. http://www.haskell.org/haskellwiki/HXT
OmegaGB, Haskell Game Boy Emulator. Bit Connor [27]announced OmegaGB,
an emulator for the Nintendo Game Boy, written in pure Haskell. It
uses gtk2hs for the user interface, but there is also a version that
doesn't require gtk2hs and uses ascii art. You can find more
information about the program at [28]the website.
27. http://article.gmane.org/gmane.comp.lang.haskell.general/14938
28. http://www.mutantlemon.com/omegagb/
Takusen 0.6. Oleg and Alistair [29]announced a new release of
[30]Takusen, the database library for Haskell. There are a large
number of changes and bug-fixes in this release, including improved
Oracle and PostgreSQL support.
29. http://article.gmane.org/gmane.comp.lang.haskell.libraries/6209/
30. http://darcs.haskell.org/takusen
hoogle.el. David House [31]announced Hoogle.el, a simple Emacs Lisp
library that nicely integrates [32]Hoogle into Emacs.
31. http://article.gmane.org/gmane.comp.lang.haskell.general/14944
32. http://haskell.org/haskellwiki/Hoogle.el
Buggy nofib. Josep Silva Galiana [33]announced a 'buggy' version of
the nofib collection of Haskell programs. [34]All programs contain one
of these bugs: a bug that produces an incorrect result; a bug that
produces non-termination; a bug that produces an exception (e.g., div
by zero). [35]The buggy nofib suite can be used to test debugging
tools.
33. http://article.gmane.org/gmane.comp.lang.haskell.general/14825
34. http://einstein.dsic.upv.es/darcs/nofib
35. http://einstein.dsic.upv.es/nofib
nobench: Haskell implementation shootout. Don Stewart [36]announced
nobench, a cross-implementation performance benchmark suite, based on
nofib, [37]comparing the performance of various Haskell compilers and
bytecode interpreters on a range of programs.
36. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19684
37. http://www.cse.unsw.edu.au/~dons/nobench.html
Derangement version 0.1.0. Dennis Griffith [38]announced the initial
version of derangement, a library for finding a derangement of a set.
A derangement of a set is a permutation with no fixed points, like
many constrained matching problems it is susceptible to solution via a
Max-flow algorithm.
38. http://article.gmane.org/gmane.comp.lang.haskell.cafe/19714
HSH 1.0.0. John Goerzen [39]announced the first release of HSH. HSH is
designed to let you mix and match shell expressions with Haskell
programs. With HSH, it is possible to easily run shell commands,
capture their output or provide their input, and pipe them to/from
other shell commands and arbitrary Haskell functions at will. HSH
makes it easy to run shell commands. But its real power is in piping.
You can pipe -- arbitrarily -- between external programs, pure Haskell
functions, and Haskell IO functions
39. http://article.gmane.org/gmane.comp.lang.haskell.cafe/20053
A new Haskell cookbook. Martin Bishop [40]began a preliminary page,
and fleshed out some of the headers/sub-headers on the wiki page for a
good Haskell Cookbook (not a PLEAC clone). [41]Please contribute.
40. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19790
41. http://haskell.org/haskellwiki/Cookbook
Haskell'
This section covers the [42]Haskell' standardisation process.
* [43]Global variables
* [44]Polymorphic components, so far
* [45]do-and-if-then-else modification
* [46]Fixity resolution, possible specification
* [47]Disjunctive tuples
42. http://hackage.haskell.org/trac/haskell-prime
43. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2054
44. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2076
45. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2120
46. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2121
47. http://thread.gmane.org/gmane.comp.lang.haskell.prime/2133
Libraries
This week's proposals and extensions to the [48]standard libraries.
* [49]Data.Proxy
* [50]Add extra readline completion functionality
* [51]Control.Monad.Cont documentation
* [52]Add First and Last wrappers around Maybe to Data.Monoid
* [53]Add ioeGetLocation, ioeSetLocation to System/IO/Error.hs
48. http://haskell.org/haskellwiki/Library_submissions
49. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6238
50. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6256
51. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6287
52. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6319
53. http://thread.gmane.org/gmane.comp.lang.haskell.libraries/6320
Discussion
Haskell with only one typeclass. Oleg Kiselyov [54]described how, if
the ability to define typeclasses is removed from Haskell, no
expressivity is lost. If Haskell had only one, pre-defined typeclass
with only one method, we could still do normal Haskell programming
with standard and user-defined overloaded numerical functions, monads,
monad transformers, etc. Haskell with only one typeclass can express
all of Haskell98 typeclass programming idioms including constructor
classes, plus multi-parameter type classes and some functional
dependencies.
54. http://article.gmane.org/gmane.comp.lang.haskell.general/14936
Data type declarations are implicitly moduled. Chris Moline
[55]proposed an idea to allow multiple data declarations to share
constructors by having them be implicitly declared inside a module.
55. http://article.gmane.org/gmane.comp.lang.haskell.general/14847
Importance of MonadRandom. Yitzchak Gale [56]pointed out the
importance of Cale Gibbard's [57]MonadRandom. This monad makes it
possible to write functions that use randomness without having to
specify in advance whether the source of randomness will be a pure
pseudorandom number generator, as in System.Random, or physical
randomness via the IO monad, such as your operating system's source of
physical randomness, or random.org, or a hardware random generator.
56. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19058
57. http://www.haskell.org/haskellwiki/New_monads/MonadRandom
Become a GHC build slave!. Simon Marlow [58]pointed out that, thanks
largely to Ian Lynagh, GHC now has a BuildBot infrastructure to
automate nightly builds on multiple platforms. This replaces the old
set of shell scripts that we used to run nightly builds; now adding
new clients to the setup is [59]relatively easy. So far we have
various Windows builds running, and I'll be moving over the existing
Linux nightly builds in due course.
58. http://article.gmane.org/gmane.comp.lang.haskell.cafe/19103
59. http://hackage.haskell.org/trac/ghc/wiki/BuildBot
Editor support for low level hacking. Don Stewart [60]mentioned some
tools used for making low level optimisation of GHC Haskell code
easier
60. http://article.gmane.org/gmane.comp.lang.haskell.cafe/19348
Optimisation fun. Creighton Hogg [61]sparked a long thread on
optimising prime sieves in Haskell
61. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19380
OO Design in Haskell Example. Steve Downey [62]began a thread on OO
design in Haskell
62. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19897
Safe lists with GADTs. Neil Mitchell [63]explored a safe version of
head and tail, on a safe version of lists, using GADTs
63. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/19901
Jobs
Research position at Nokia Research Center. Jamey Hicks [64]announced
the availability of a senior research engineer position at Nokia
Research Center Cambridge, US. They are seeking an exceptional, highly
motivated individual who is interested in a unique opportunity to
collaborate with a world-class academic research community. This
position is for the Armo project at NRC Cambridge, using Bluespec
hardware description language to radically improve Nokia's ability to
develop advanced SOCs and corresponding software for future mobile
phones and mobile computers. We are investigating co-development of
hardware and software components for such devices. Success in the
project will lead to both academic publication as well as a
significant positive impact on Nokia products and engineering.
64. http://article.gmane.org/gmane.comp.lang.haskell.general/14901
New PhD Positions Computing Science, Chalmers University. Koen
Claessen [65]announced new [66]PhD positions for 2007, at Chalmers
University of Technology. The focus is on algorithms, bioinformatics,
distributed systems and computing, functional programming, formal
methods, interaction design, language technology, language based
security, parallel and high performance computing, programming logic
and type theory, but research is not restricted to these topics.
65. http://article.gmane.org/gmane.comp.lang.haskell.general/14900
66. http://chalmersnyheter.chalmers.se/chalmers03/english/eng_vacanciesarticle.jsp?article=8730
Positions at Oxford: refactoring tools. Oege.de.Moor [67]announced the
availability of positions in the Programming Tools Group at Oxford,
researching aspect refactoring tools
67. http://article.gmane.org/gmane.comp.lang.haskell.general/14860
Blog noise
[68]Haskell news from the blogosphere.
* [69]Writing a Simple Search Engine in Haskell: Part 0 - Introduction
* [70]Writing a Simple Search Engine in Haskell: Part 1 Maybe and List
* [71]Haskell IO for Imperative Programmers
* [72]Quotient Types for Information Hiding
* [73]How Many Functions are There of Type Bool -> Bool?
* [74]Macros for Haskell? Done.
* [75]More on Haskell, Side Effects and Code Reuse
* [76]The theory of monads
* [77]Writing code by types
* [78]Haskell: open secret in Ruby land
* [79]Ruby vs Haskell: choose what works
* [80]Real time Haskell
* [81]Folds and functional programming
* [82]Countable Ordinals in Haskell
* [83]Haskell
* [84]Programming and the Metaphorical Mind
* [85]Languages and the semiskilled developer
* [86]Building a Firewall Against Complexity
* [87]The Killer App for a new language
* [88]Time travel in Haskell
* [89]Comonads and reading from the future
* [90]Flirting with Functional Programming
* [91]A fold-like procedure in C
* [92]Monads in Qi
* [93]Monads work because they have a tight interface
* [94]What's wrong with for loops
* [95]More on what's wrong with for loops
* [96]Haskell, CAL and Scala
* [97]Haskell: Queues without pointers
* [98]Type Classes: Not Quite Overloading
* [99]Generalised Algebraic Data Types, Phantom Types, and Dependent Types
* [100]An IRC client/server in Haskell
* [101]Language design: grand architecture versus feature collections
* [102]Thoughts on one week in Haskell
* [103]Why its hard for imperative programmers to learn Haskell
* [104]Refunctoring with polymorphism
* [105]Introductory console IO in Haskell
* [106]Learn the lambda calculus
* [107]Haskell for Alphas and Betas
* [108]My evolution as a Haskell programmer
* [109]On learning Haskell
* [110]Greenspun's Tenth Rule applied to Haskell
* [111]Cabal with rpm goodness
* [112]F#
* [113]Arithemtic coding in Haskell
* [114]A filesystem tree printer
* [115]Using Bayesian filtering instead of 'if' in Haskell
* [116]Combinator parsing
* [117]Monads for vector spaces, probability and quantum mechanics pt. I
* [118]Monads, Vector Spaces and Quantum Mechanics pt. II
* [119]Learning the Haskell programming language
* [120]A twisted history of monad transformers
* [121]Monadic parsing
* [122]Forth as a Haskell DSL
* [123]A better environment for shell scripting
* [124]Smart classification using Bayesian monads in Haskell
* [125]Haskell like data structures in Common Lisp
68. http://planet.haskell.org/
69. http://blogs.nubgames.com/code/?p=18
70. http://blogs.nubgames.com/code/?p=19
71. http://blogs.nubgames.com/code/?p=22
72. http://japple.blogspot.com/2007/01/quotient-types-for-information-hiding.html
73. http://japple.blogspot.com/2007/01/how-many-functions-are-there-of-type.html
74. http://clemens.endorphin.org/weblog/archives/2007-01.shtml#e2007-01-31T12_21_00.txt
75. http://neilbartlett.name/blog/?p=13
76. http://scienceblogs.com/goodmath/2007/01/the_theory_of_monads_and_the_m_1.php
77. http://neilmitchell.blogspot.com/2007/01/writing-code-by-types.html
78. http://notes-on-haskell.blogspot.com/2007/01/haskell-open-secret.html
79. http://notes-on-haskell.blogspot.com/2007/01/ruby-vs-haskell-choose-what-works.html
80. http://mikeburrell.wordpress.com/2007/02/01/real-time-haskell/
81. http://mikeburrell.wordpress.com/2007/02/01/functional-idempotence-optimization/
82. http://japple.blogspot.com/2007/02/countable-ordinals-in-haskell.html
83. http://vanirsystems.com/danielsblog/?p=103
84. http://toomuchcode.blogspot.com/2007/02/part-1-programming-and-metaphorical.html
85. http://toomuchcode.blogspot.com/2007/02/part-2-languages-and-lesser-skilled.html
86. http://toomuchcode.blogspot.com/2007/02/building-firewall-against-complexity.html
87. http://toomuchcode.blogspot.com/2007/02/part-4-killer-app.html
88. http://community.livejournal.com/evan_tech/216270.html
89. http://sigfpe.blogspot.com/2007/02/comonads-and-reading-from-future.html
90. http://johnleesmiller.blogspot.com/2007/02/first-post.html
91. http://www.yomi.at/archive/2007/02/115
92. http://programmingkungfuqi.blogspot.com/2007/02/monads-in-qi.html
93. http://www.sdowney.org/2007/01/monads-rest-and-c-template.html
94. http://notes-on-haskell.blogspot.com/2007/02/whats-wrong-with-for-loop.html
95. http://notes-on-haskell.blogspot.com/2007/02/whats-wrong-with-for-loop-revisited.html
96. http://blog.tmorris.net/ignorance-is-mostly-bliss-but-not-always/
97. http://www.randomhacks.net/articles/2007/02/08/haskell-queues-without-pointers
98. http://www.cs.nott.ac.uk/~pni/Papers/Notes/typeClassOvld.html
99. http://www.cs.nott.ac.uk/~pni/Papers/Notes/GADTs.html
100. http://blog.nurd.se/hype/?p=30
101. http://www.dysfunctor.org/2007/02/13/architecture-vs-features/
102. http://kevin.scaldeferri.com/blog/2007/02/12/OneWeek.html
103. http://qftblog.wordpress.com/2007/02/14/why-its-so-hard-for-imperative-programmers-to-learn-funtional-languages/
104. http://blog.tmorris.net/refunctoring/
105. http://cod3po37ry.blogspot.com/2007/02/more-on-haskell-io-and-interact.html
106. http://foreigndispatches.typepad.com/dispatches/2007/02/an_introduction.html
107. http://paulspontifications.blogspot.com/2007/02/haskell-for-alphas-and-betas.html
108. http://onthebalcony.wordpress.com/2007/02/19/my-evolution-as-a-haskell-programmer/
109. http://osfameron.vox.com/library/post/on-learning-haskell.html
110. http://japple.blogspot.com/2007/02/conors-rule.html
111. http://www.serpentine.com/blog/2007/02/20/haskell-cabal-now-with-extra-crunchy-rpm-goodness/
112. http://reddevnews.com/news/devnews/article.aspx?editorialsid=164
113. http://vandreev.wordpress.com/2007/01/07/arithmetic-coding/
114. http://blog.moertel.com/articles/2007/02/22/a-simple-directory-tree-printer-in-haskell
115. http://www.randomhacks.net/articles/2007/02/22/bayes-rule-and-drug-tests
116. http://mikeburrell.wordpress.com/2007/02/25/combinator-parsing/
117. http://sigfpe.blogspot.com/2007/02/monads-for-vector-spaces-probability.html
118. http://sigfpe.wordpress.com/2007/03/04/monads-vector-spaces-and-quantum-mechanics-pt-ii/
119. http://printf.wordpress.com/2007/02/27/haskell-functional-programming-language/
120. http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Monad_transformers.html
121. http://gbacon.blogspot.com/2007/02/my-first-monadic-program.html
122. http://shaurz.wordpress.com/2007/03/03/forth-as-a-haskell-dsl-or-lambda-the-ultimate-stack/
123. http://changelog.complete.org/posts/587-A-better-environment-for-shell-scripting.html
124. http://www.randomhacks.net/articles/2007/03/03/smart-classification-with-haskell
125. http://common-lisp.net/project/patty/patty.html
Quotes of the Week
* sleepingsquirrel: Programming in Haskell is like having an
interactive conversation with a teleportation machine. You tell it
you want to go to some place warm and sandy. The machine complains
about ambiguous constraints. So you tell it that there should be
plenty of free tropical fruit drinks. It carps 'Inferred location
less polymorphic than expected'. Whoops, free flowing that is...
After a few more iterations, there's a little puff of smoke, and
at the sound of the chimes, you discover you're now on the beach
in Tahiti. And although you've used the machine many times before,
you can't help but be impressed that it usually 'Just works' most
of the time.
* jmillikin: If I had to work on code with performance requirements,
Haskell would be my choice (followed by C++). Haskell has
functional goodness with the ability to break into imperative
mode, and C++ gives me direct memory management with a few
functional pieces.
* Cale: It ought to be called simonPerformIO, and only used if your
first name is Simon
* monochrom: m a -> (a -> m b) -> m b is much more to the point than
'mumble computation mumble computation'
* mwc: There's a time when your brain doesn't get the monads. Then
something violent and irreversable happens and you hate every
other language for not having monads
Code Watch
Wed Feb 28 05:07:14 PST 2007. Simon Marlow. [126]Remove vectored
returns. We recently discovered that they aren't a win any more, and
just cost code size.
126. http://article.gmane.org/gmane.comp.lang.haskell.cvs.ghc/19418
Wed Feb 21 09:04:01 PST 2007. simonpj. [127]Allow GADT syntax for
newtypes
127. http://article.gmane.org/gmane.comp.lang.haskell.cvs.ghc/19344
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