- Libraries - Haskell.org

transformers versus mtl
by Sittampalam, Ganesh 28 Mar '09

28 Mar '09

Hi, What are the relative status of transformers and mtl? Are we trying to deprecate mtl use in favour of transformers (+ appropriate dependencies like monads-fd)? I see that the initial version of the Haskell Platform is planning to use mtl because of its status in extralibs - but if transformers is the way forward, then perhaps this should be changed? Cheers, Ganesh =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================

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Fwd: transformers versus mtl
by Iavor Diatchki 25 Mar '09

25 Mar '09

(Ganesh, sorry for the double post, I meant to send this to the list) Hello, On Tue, Mar 24, 2009 at 2:42 PM, Sittampalam, Ganesh <ganesh.sittampalam(a)credit-suisse.com> wrote: > Sittampalam, Ganesh wrote: > ...the Functor instances for > ReaderT r m and WriterT w m now (correctly) depend on Functor m, > whereas in mtl they depend on Monad m. Does anyone ever use ReaderT and WriterT with a type that is not a monad (i.e., use them as functor transformers rather then monad transformers)? On the other hand, with the unfortunate lack of relation between Functor and Monad in Haskell, it seems these instances will not work if I try to transform a monad that does not have a functor instance. -Iavor

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Replace SCC algorithm of containers
by Iavor Diatchki 24 Mar '09

24 Mar '09

Hello, Some time ago I implemented an algorithm that computes the strongly connected components of a graph that is considerably faster than the code in the containers package, at least for larger graphs. This has been available for a while in a separate package on hackage (GraphSCC). I propose that we merge the code into containers, and simply replace the relevant functions. Any objections? -Iavor

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Timeouts uploading to Hackage
by Don Stewart 23 Mar '09

23 Mar '09

A couple of users have reported timeouts uploading to Hackage. I've noticed upload times taking longer and longer of previous weeks. Ross, any thoughts? -- Don

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ANN: regex-tdfa 1.1.1
by ChrisK 22 Mar '09

22 Mar '09

This is both a bug fix release and a feature release. The bug fix is a bit embarrassing, the indices were correct but the captured text was wrong in version 1.1.0. Oops. As of version 1.1.1 the following GNU extensions are recognized, all anchors: \` at beginning of entire text \' at end of entire text \< at beginning of word \> at end of word \b at either beginning or end of word \B at neither beginning nor end of word There is a "newSyntax" field of CompOptions that can enable/disable this syntax. These were requested by users of the Yi project. The "home page" is on the wiki and UPDATED a bit at http://haskell.org/haskellwiki/Regular_expressions#regex-tdfa The HADDOCK fails on hackage for now, but is up at http://darcs.haskell.org/packages/regex-unstable/regex-tdfa/doc/html/regex-… The released code is on hackage at http://hackage.haskell.org/cgi-bin/hackage-scripts/package/regex-tdfa The darcs repository is at http://darcs.haskell.org/packages/regex-unstable/regex-tdfa/ Cheers, Chris

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Dependency version problem with Cabal
by jutaro 19 Mar '09

19 Mar '09

In my leksah.cabal file i have the package dependency Cabal >=1.6.0.1. When I have installed Cabal-1.6.0.2 as well a s1.6.0.1 I get the following warning: Warning: This package indirectly depends on multiple versions of the same package. This is highly likely to cause a compile failure. package ghc-6.10.1 requires Cabal-1.6.0.1 package leksah-0.4.3 requires Cabal-1.6.0.2 Why does this happen, as leksah does not require Cabal-1.6.0.2? How can I solve this problem? Jürgen Nicklisch-Franken -- View this message in context: http://www.nabble.com/Dependency-version-problem-with-Cabal-tp22590000p2259… Sent from the Haskell - Libraries mailing list archive at Nabble.com.

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ANN: regex-tdfa-1.1.0
by ChrisK 18 Mar '09

18 Mar '09

I have just uploaded the new regex-tdfa-1.1.0 to hackage. This version is a small performance update to the old regex-tdfa-1.0.0 version. Previously all text (e.g. ByteString) being search was converted to String and sent through a single engine. The new version uses a type class and SPECIALIZE pragmas to avoid converting to String. This should make adding support for searching other Char containers easy to do. The new version includes six specialized engine loops to take advantage of obvious optimizations of the traversal. The previous version had only a couple of such engines. The new code paths have been tested for correctness and no performance degradations have shown up. -- Chris

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Re: Cabal install error msg
by Duncan Coutts 17 Mar '09

17 Mar '09

On Tue, 2009-03-17 at 15:30 +1030, Mark Spezzano wrote: > Hi all, > I’m trying to do an install of OpenGL on Windows using Cabal > I type > >cabal.exe configure OpenGL > And get > sh: runProcess: does not exist (No such file or directory) > What’s the cause? The OpenGL package uses a ./configure script which needs sh.exe and various other programs. Cabal is trying to run sh.exe but it cannot find it. To build the OpenGL package on Windows you need to build it from within an MSYS shell (which provides sh.exe and the other required tools). There's also a ticket for the bad error message: #403 Bad error message when running ./configure fails to find sh http://hackage.haskell.org/trac/hackage/ticket/403 It should be very easy to improve the error message. Patches welcome. Duncan

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Cabal install error msg
by Mark Spezzano 17 Mar '09

17 Mar '09

Hi all, I’m trying to do an install of OpenGL on Windows using Cabal I type >cabal.exe configure OpenGL And get sh: runProcess: does not exist (No such file or directory) What’s the cause? Cheers, Mark Spezzano No virus found in this outgoing message. Checked by AVG. Version: 7.5.557 / Virus Database: 270.11.15/2004 - Release Date: 16/03/2009 7:04 AM

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Ticket #3058: Add 'hex' to the pretty package (and other thoughts)
by Thomas DuBuisson 15 Mar '09

15 Mar '09

All, http://hackage.haskell.org/trac/ghc/ticket/3058 Attached is a patch for Text.PrettyPrint.HughesPJ that adds a 'hex' function to print hexidecimal numbers. The only point that I exepect to be contended is it varies slightly from the surrounding functions in that it allows one to control the number of characters printed: > hex 5 31 0001f > hex 2 8 08 > hex 3 7495 d47 While we can argue about the consistancy issues, I almost always want to control the number of digits when dealing with hex. Hence I feel this is a reasonable special case. Secondary Issues: 1) Is there a repo for pretty? I didn't see one on code.haskell.org 2) If I submit a ticket+patch to move Text.PrettyPrint.HughesPJClass (from prettyclass, Augustsson) into Text.PrettyPrint (of the 'pretty' package) would anyone object? It feels mis-placed / I feel things need consolidated. Thomas

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