November 2007 - Haskell-Cafe

getDirectoryContents still causing problems Re: problems building ycr2js (hopefully fixed)
by Thomas Hartman 26 Nov '07

26 Nov '07

still having problems darcs pulling your updates, related to System.FilePath. did you make clean and then make again? I darcs pulled everything. (cd src/translator/js; make all install) ... ... (cd /home/thartman/haskell-installs/yhc-install/yhc/src/translator/js/lib/haskell; \ for f in `find . -name '*.hs' | sort` ; do make -s -f /home/thartman/haskell-installs/yhc-install/yhc/src/translat\ or/js/Makefile `dirname $f`/`basename $f .hs`.ycr ; done) yhc: /home/thartman/haskell-installs/yhc-install/yhc/inst/lib/yhc/packages: getDirectoryContents: does not exist (No such fi\ le or directory) -s flag silences, we don't want that, with verbose output again we see that make is failing for a huge number of packages (cd /home/thartman/haskell-installs/yhc-install/yhc/src/translator/js/lib/h\ askell; \ for f in `find . -name '*.hs' | sort` ; do make -f /home/thartman/haskell-installs/yhc-install/yhc/src/translator/\ js/Makefile `dirname $f`/`basename $f .hs`.ycr ; done) > yhc --core --no-bytecode CDOM/Level1/DomUtils.hs yhc: /home/thartman/haskell-installs/yhc-install/yhc/inst/lib/yhc/packages: getDirectoryContents: does not exist (No such fi\ le or directory) make: *** [CDOM/Level1/DomUtils.ycr] Error 1 yhc --core --no-bytecode CDOM/Level1/Events.hs yhc: /home/thartman/haskell-installs/yhc-install/yhc/inst/lib/yhc/packages: getDirectoryContents: does not exist (No such fi\ le or directory) ... thartman@none:~/haskell-installs/yhc-install/yhc/src/translator/js/lib/haskell>yhc --core --no-bytecode CDOM/Level1/DomUtils\ .hs yhc: /home/thartman/haskell-installs/yhc-install/yhc/inst/lib/yhc/packages: getDirectoryContents: does not exist (No such fi\ le or directory) Unfamiliar with yhc, I couldn't figure out where getDirectory contents is being called from. Grepping at the root, I guess something here is causing problems thartman@none:~/haskell-installs/yhc-install/yhc>grep -irl getDirectoryContents * Make/Useful.hs inst/bin/yhc src/compiler98/Package.hs src/packages/yhc-base-1.0/System/Directory.hs src/packages/haskell98-1.0/Directory.hs src/tester/Main.hs tests/conformance98/Directory/getDirContents/Main.hs best, thomas. 2007/11/25, Dimitry Golubovsky <golubovsky(a)gmail.com>: > Thomas, > > On Nov 25, 2007 5:50 PM, Thomas Hartman <tphyahoo(a)gmail.com> wrote: > > Thanks Dmitri, I also had to fix an issue with System.FilePath, > > there's a message about this on haskell cafe. > > In fact, takeDirectory is the right replacement for getDirectory in > older FilePath. I have pushed this change too. > > Thanks. > > -- > Dimitry Golubovsky > > Anywhere on the Web >

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New demo/test program for Yhc Javascript backend
by Dimitry Golubovsky 26 Nov '07

26 Nov '07

Hi, For those of you who are interested in using Haskell in client-side web application programming: I have added a new demo/test program to this Wiki page ("Does it leak?"): http://haskell.org/haskellwiki/Yhc/Javascript This demo program shows some progress made since the first announcement of Yhc Javascript backend (Core to Javascript converter) was made about a year ago. Please test the demo for functionality and memory leaks in various browsers. Your feedback is appreciated. The demo program is self-contained (does not require any Haskell libraries beyond those included with Yhc). There is a darcs repo: http://www.golubovsky.org/repos/wsptest/ from which this demo program along with Makefile can be obtained if anybody wants to play with the code. Thanks. -- Dimitry Golubovsky Anywhere on the Web

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The Monad.Reader - Call for Copy
by Wouter Swierstra 26 Nov '07

26 Nov '07

Call for Copy The Monad.Reader - Issue 10 I would like to welcome articles for the anniversary issue of The Monad.Reader. * The Monad.Reader * The Monad.Reader is an electronic magazine about all things Haskell. It is less-formal than journal, but somehow more enduring than a wiki- page. There have been a wide variety of articles, including: exciting code fragments, intriguing puzzles, book reviews, tutorials, and even half-baked research ideas. * Submission Details * Get in touch with me if you intend to submit something -- the sooner you let me know what you're up to, the better. Please submit articles for the next issue by e-mail (wss at cs.nott.ac.uk) to me before ** January 25, 2008 ** Articles should be written according to the guidelines available from http://www.haskell.org/haskellwiki/The_Monad.Reader Please submit your article in PDF, together with any source files you used. The sources will be released together with the magazine under a BSD license. If you would like to submit an article, but have trouble with LaTeX please let me know and we'll sort something out. Looking forward to your submission, Wouter This message has been checked for viruses but the contents of an attachment may still contain software viruses, which could damage your computer system: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.

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SingHaskell, Nov 28 (Second Call)
by Tom Schrijvers 25 Nov '07

25 Nov '07

What is SingHaskell? Sing(apore)Haskell is a Haskell (and related languages) meeting in Singapore. The meeting is organized by Tom Schrijvers ( Tom.Schrijvers(a)cs.kuleuven.be ) and Martin Sulzmann ( sulzmann(a)comp.nus.edu.sg ) and will be hosted by the National University of Singapore. Date and location Sing(apore)Haskell takes place on Wed 28 Nov 2007 (right before APLAS'07 http://flint.cs.yale.edu/aplas2007/) The meeting will be held on the National University of Singapore campus at COM1-02-VC (2nd floor video conference room, School of Computing) Further location details: http://www.comp.nus.edu.sg/aboutsoc/getting_to_soc_at_com1.htm http://www.comp.nus.edu.sg/corpcomm/location/maps.htm#com1 http://www.comp.nus.edu.sg/corpcomm/location/COM1_L2.htm The meeting starts at 9:30am and should end around 2pmish (with a lunch-break, on your own, in between) Let Tom or Martin know if you are interested in coming. Either to attend the meeting or even give a talk. Programme 9:30-9:55 Welcome, Quick intro to Haskell, Martin Sulzmann 10:00-10:25 First Class Constraint Programming in Haskell, Tom Schrijvers 10:30-10:55 Implementing STM in Concurrent Haskell, Frank Huch 11:00-11:25 Rule-based concurrent programming in Haskell, Edmund Lam 11:30-11:55 XHaskell - Adding regular expression types to Haskell, Kenny 12:00 - 12:25 Static Contract Checking for Haskell, Dana Xu 12:30 - 13:20 Lunch break 13:30 - 13:25 Functional dependencies versus type functions and beyond, Martin Sulzmann 13:30-13:55 Bernd Brassel For more information, see http://taichi.ddns.comp.nus.edu.sg/taichiwiki/SingHaskell2007 -- Tom Schrijvers Department of Computer Science K.U. Leuven Celestijnenlaan 200A B-3001 Heverlee Belgium tel: +32 16 327544 e-mail: tom.schrijvers(a)cs.kuleuven.be url: http://www.cs.kuleuven.be/~toms/

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Re: problems building ycr2js (hopefully fixed)
by Dimitry Golubovsky 25 Nov '07

25 Nov '07

Thomas, On Nov 25, 2007 5:50 PM, Thomas Hartman <tphyahoo(a)gmail.com> wrote: > Thanks Dmitri, I also had to fix an issue with System.FilePath, > there's a message about this on haskell cafe. In fact, takeDirectory is the right replacement for getDirectory in older FilePath. I have pushed this change too. Thanks. -- Dimitry Golubovsky Anywhere on the Web

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problems building ycr2js (hopefully fixed)
by Dimitry Golubovsky 25 Nov '07

25 Nov '07

Hi, I have made the file `addtags.idl' part of the repo. Please do scons update and see if it compiles. PS If there are any other problems with Yhc/Javascript backend, please CC me, golubovsky(a)gmail.com Thanks -- Dimitry Golubovsky Anywhere on the Web

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problems building ycr2js
by Dimitry Golubovsky 25 Nov '07

25 Nov '07

Hi again, I'm thinking: if this all is about a small file, addtags.idl which is generated in some unusual way, I might just add it to the distributable source tree, and then nobody would have had problems with ${var:m:n} substitution. Thanks. -- Dimitry Golubovsky Anywhere on the Web

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Re: [Haskell-cafe] Libraries need a new owner
by Don Stewart 25 Nov '07

25 Nov '07

bernardy: > On Nov 25, 2007 9:23 PM, Don Stewart <dons(a)galois.com> wrote: > > > > What are the long term goals of the project? To merge key data > > structures into the containers library? > > > > They are a more like a replacement, with (almost) the same api, and > better performance (last time we checked). > > Besides, I maintain a common class framework API to use (and test, etc.) > all those beasts uniformly. Can you give an overview of which data structures we now have better replacements for, and what is preventing them being replaced? Perhaps a good next step would be to break containers up into smaller pieces, so that individual parts of the containers library can be selectively replaced? Once we have experience with what breaks, and what is faster, then we can proceed to replace components? -- Don

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problems building ycr2js
by Dimitry Golubovsky 25 Nov '07

25 Nov '07

Hi, This is my stuff, and I am of course willing to fix this to make more compatible. I am not really deep into this "shell hell" (that is, used anything that worked for me not seeing much difference between shells in e. g. Archlinux vs. Ubuntu), but if there are any suggestions what could be fixed (if at all) please let me know. Thanks. -- Dimitry Golubovsky Anywhere on the Web

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Searched for mdo on haskell.org. Found nothing.
by Richard Kelsall 25 Nov '07

25 Nov '07

I was reading the 'Problems with do notation' thread and Thomas Schilling suggested reading about mdo. Not knowing mdo I thought that sounds interesting and went to http://haskell.org/ which redirects you to http://haskell.org/haskellwiki/Haskell and gives you a search box. Typing mdo and clicking the Search button gives "Showing below 0 results starting with #1. No page title matches No page text matches Note: unsuccessful searches are often caused by searching for common words like "have" and "from", which are not indexed, or by specifying more than one search term (only pages containing all of the search terms will appear in the result)." Maybe mdo is too common to be indexed? So I went to Google and searched for Haskell mdo and top of the list is this page : http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html which is Chapter 8. GHC Language Features 8.3. Syntactic extensions which describes mdo. Did I do something wrong when searching haskell.org? Richard.

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