- Haskell-Cafe - Haskell.org

haskellnet
by Robert Wills 22 May '09

22 May '09

Hello, Yesterday I found myself wanting to clear out a spam-ridden pop account without downloading all the messages. Rather than just using Python's poplib, I thought I might look for a haskell solution and came across Haskellnet: http://darcs.haskell.org/SoC/haskellnet/ I ended up spending much of the afternoon getting it to compile and much of last night trying to get the pop library to actually work (the 'strip' method produced exceptions). It was a good learning experience (this was helpful: http://donsbot.wordpress.com/2007/11/14/no-more-exceptions-debugging-haskel…) I'm writing here because I'm wondering whether it would be worthwhile putting it up on hackage? From searching this list, there seem to have been a few times when people have stumbled across it but got frustrated when it didn't compile. If so, what's the protocol? Is the original author, Jun Mukai, still around? Thanks, Rob

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Putting unit tests in cabal files (Was Re: [Haskell-cafe] HUnit)
by Magnus Therning 22 May '09

22 May '09

On Fri, May 22, 2009 at 12:13 AM, Vasili I. Galchin <vigalchin(a)gmail.com> wrote: > Hello, > > I have some code with several test cases that use HUnit. I added hunit > as one of my cabal dependencies but cabal complained with: > > Setup: At least the following dependencies are missing: > hutil -any > > What am I doing incorrectly? Would you mind posting your .cabal file too? The reson I'm asking is that I've so far _never_ put any information about unit tests or quickcheck tests in my .cabal file, simply because I don't want the executables to be picked up by automatic package converters such as cabal2arch. Instead I have a makefile for building my test programs. If you have some way of keeping information about building of tests in your .cabal I'd be very interested in seeing it. /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe

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HUnit
by Vasili I. Galchin 22 May '09

22 May '09

Hello, I have some code with several test cases that use HUnit. I added hunit as one of my cabal dependencies but cabal complained with: Setup: At least the following dependencies are missing: hutil -any What am I doing incorrectly? Thanks, Vasili

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ANN: TxtSushi 0.1
by Keith Sheppard 22 May '09

22 May '09

Hello Haskell Cafe I have released the first version of TxtSushi which is a collection of command line utils (written in haskell of course) for processing tab-delimited and CSV files. It includes a util for doing SQL SELECTs on flat files. This is my first haskell project and feedback of all kinds is appreciated. Home Page: http://www.keithsheppard.name/txt-sushi Darcs Repository: http://patch-tag.com/r/txt-sushi/home Issue Tracking: http://code.google.com/p/txt-sushi I would like to say thanks to the haskell-beginners contributors, the author of "Learn you a Haskell" and the author of the parsec library all of which were very helpful. Regards Keith

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Function Returning Type?
by jrw4 21 May '09

21 May '09

I wrote this function as I am just learning Haskell. What it does is it generates a list of all rational numbers between 0 and 1, but I only have it show the first 20. rationals n :: Integer -> String rationals n = (putStr . unlines . map show) (take n (nub [x % y | y <- [1..], x <- [1..y], x < y])) Now my problem is the type declaration, the first line. I get the error "Invalid type signature". I googled this error and I was not able to find out why it is giving it to me. I have also tried: rationals n :: Integer -> [Ratio] but it gives me the same error. Please someone point me in the right direction. Thanks. -- View this message in context: http://www.nabble.com/Function-Returning-Type--tp23658819p23658819.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.

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ANN: feed2twitter 0.2 & hackage2twitter 0.2.1
by Tom Lokhorst 21 May '09

21 May '09

To all the cool kids using the Twitter (and to anyone else): I'm happy to announce the first release of feed2twitter. Build on top of the excellent feed and hs-twitter packages, feed2twitter sends posts from a news feed to Twitter. The hackage2twitter executable is build on top of the feed2twitter library. It `tweets' the releases of new Hackage-packages. In the 3 days it has been running, it has already posted 70+ releases: http://twitter.com/Hackage - Tom Lokhorst http://hackage.haskell.org/cgi-bin/hackage-scripts/package/feed2twitter http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hackage2twitter

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Re: [Haskell-cafe] Haskell in 3 Slides
by Kalman Noel 21 May '09

21 May '09

Joe Fredette schrieb: > 3-4 slides imply 3-4 topics, so the question is what are the 3-4 biggest > topics in haskell? I would think they would be: > > * Purity/Referential Transparency > * Lazy Evaluation > * Strong Typing + Type Classes > * Monads If the goal is to be able to talk about different examples of Haskell code in the rest of the presentation, the big topic I'd choose would be called »How function definitions look like in Haskell«. Kalman

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Haskell philosophy question
by Vasili I. Galchin 21 May '09

21 May '09

Hello, I am confused between Haskell as delineated in the Haskell Report VS ghc "pragmas" which extend Haskell beyond the Haskell Report. I am sure I am not the first to ask. Caveat: on my part, I am not against innovation/extensions, but I don't like to see language "bloat". This is not a negative/pegorative statement .... just a challenging one. Kind regards, vasili

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Re: Re: [Haskell-cafe] what's the definition of "satisfy" and "<?>" ?
by Lee Duhem 21 May '09

21 May '09

On Thu, May 21, 2009 at 6:48 PM, z_axis <z_axis(a)163.com> wrote: > Sorry! I am a haskell newbie. then i will have a look at > Text.ParserCombinators.Parsec.Char Don't forget to CC your reply to the list, so other people on the thread will see your reply. lee

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ANN: EsotericBot 0.0.1
by spoon＠killersmurf.com 21 May '09

21 May '09

Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/esotericbot See the homepage for online copy of README and example configuration file: http://www.killersmurf.com/projects/esotericbot Esotericbot is a sophisticated, lightweight IRC bot, written in Haskell. Esotericbot launches sub-processes to respond to commands issued by users over IRC. Why would you use esotericbot? For lambdabot-4.2.2.1: spoon@utensil:~/esotericbot$ ps e v PID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND 23433 pts/3 Sl+ 0:00 0 8228 84855 33476 1.6 lambdabot 15040 pts/5 S+ 0:00 0 2171 28804 3292 0.1 ./esotericbot I'm not insinuating that lambdabot sucks in any way, ( for lambdabot is most excellent ) however, my hope is that esotericbot could attain equal functionality through plugins, whilst maintaining its small memory footprint. Esotericbot is small, designed to run on a server with limited memory - typically running at under 5mb of private memory. Features: * Advanced memory and time management options, utilizing POSIX resource management. For example, the memory used by all child processes, can be limited - commands be queued until the memory usage has dropped. * Privileged channel operator commands ( Currently, can be disabled and enabled by channel operators, without kicking. ) * Easy to add new plugins. A C library is included to make writing new plugins/adapting programs in C easy. * Set up through a configuration file. * Multiple channels. * Multi-threaded * Lightweight, typically running at under 5mb of private memory. Cons: * POSIX memory management, process forking, and chroot means that Esotericbot is POSIX only. * Esotericbot is, due to the libraries and extensions used, restricted to being compiled by the Glorious Glasgow Haskell Compiler.

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