- Libraries - Haskell.org

mtl (Control.Monad.*) libraries re-export Control.Monad
by Andrew Pimlott 05 Dec '05

05 Dec '05

I just noticed that in the mtl libraries (Control.Monad.*) all re-export Control.Monad and sometimes other modules (Control.Monad.Trans, Control.Monad.Fix). This seems gratuitous, and is especially bothersome when one wishes to hide some export from Control.Monad. Any chance this can be changed? Andrew

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haxr - marshalling of Variants in Records
by Johannes Waldmann 05 Dec '05

05 Dec '05

Any ideas for automatically marshalling record types with variants for XML-RPC? We need to put the "tag" information somewhere, perhaps as a separate component of the TStruct (but how should it be called). Of course we can define what we want as long as client and server use haxr, but in other cases? Perhaps we should use some more general scheme (SOAP) then. If the Haskell app is the defining side, I'd love to just "derive Haskell2Xml" for my data, and then I'd want a "haskell2scheme" (not: DTD) so that the Java side can use a Schema->Java compiler (like xjc). On the other hand if I have to use a given XML schema, I want some "xhc" tool (Schema->Haskell). Perhaps some of these projects are already out there? -- -- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 -- ---- http://www.imn.htwk-leipzig.de/~waldmann/ -------

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haxr (XML RPC) rendering of string values
by Johannes Waldmann 05 Dec '05

05 Dec '05

with haxr-20050621, I have trouble interfacing to Java. When I build an XML RPC call with haxr, containing a struct, I get <?xml version='1.0' ?> <methodCall ><methodName >vorlesungen</methodName ><params ><param ><value ><struct ><member ><name >schule</name ><value ><string >HTWK Leipzig</string></value></member> ... but when I build the same call with org.apache.xmlrpc, I get <?xml version="1.0"?><methodCall><methodName>vorlesungen</methodName> <params><param><value><struct><member><name>matrikel</name><value>531</value></member> <member><name>schule</name><value>HTWK</value></member> ... the difference is that haxr has extra <string> tags for values of arguments. I don't think this is right? Best regards, -- -- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 -- ---- http://www.imn.htwk-leipzig.de/~waldmann/ -------

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RE: Data.IntMap API
by Simon Marlow 02 Dec '05

02 Dec '05

On 29 November 2005 14:00, Ross Paterson wrote: > It would be useful if one of the nightlies could put up web-browsable > documentation for the HEAD libraries. That would make it easier for > people who don't follow CVS to spot problems and contribute text > between GHC releases. Done; docs for a nightly build will from now on be available from: http://www.haskell.org/ghc/dist/current/docs/ for HEAD, and http://www.haskell.org/ghc/dist/stable/docs/ for STABLE. The HEAD docs now include the Building Guide, which currently isn't linked from the main title page (I'll fix that): http://www.haskell.org/ghc/dist/current/docs/building/ I've still to add some links from elsewhere in the GHC site. Cheers, Simon

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RE: lawbreakers in Text.PrettyPrint.HughesPJ
by Simon Peyton-Jones 30 Nov '05

30 Nov '05

It's a long time since I looked at this library. If you two can agree on what needs to be done, I'll gladly execute the change! Simon | -----Original Message----- | From: libraries-bounces(a)haskell.org [mailto:libraries-bounces@haskell.org] On Behalf Of Christian | Maeder | Sent: 24 November 2005 18:05 | To: Conal Elliott | Cc: libraries(a)haskell.org | Subject: Re: lawbreakers in Text.PrettyPrint.HughesPJ | | Conal Elliott wrote: | > Or the combinators (<>, $$, etc) might take care to build their results | > in reduced form, which seems to be the strategy that "nest" takes. | | maybe that is possible, too (as now an extra call of reduceDoc for | isEmpty is done). Fortunately isEmpty is rarely used, and if it is used | the original input is usually thrown away. | | > BTW, there's an invariant comment (about Doc, I think) that says "An | > empty document is always represented by @Empty@." If the combinators | > aren't going to ensure that's true, then probably the comment should be | > removed or fixed. | | The comment only seems to apply to RDoc that don't have Above or Beside | (at least on the top-level). | | Christian | _______________________________________________ | Libraries mailing list | Libraries(a)haskell.org | http://www.haskell.org/mailman/listinfo/libraries

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Data.IntMap API
by Iavor Diatchki 29 Nov '05

29 Nov '05

Hello, Data.IntMap (distributed with GHC 6.4.1) contains the following instance: Ord a => Monoid (IntMap a) The instance is defined with mempty = empty, and mappend = union, neither of which requires the Ord instances on the values in the map, so the 'Ord a' constraint appears unneccessary. -Iavor PS: Isn't picking union for the monoid class a little arbitrary?

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Cabal created permissions
by Bernd Brassel 29 Nov '05

29 Nov '05

Hi there, another thing I hope is worth mentioning after Simon so gloriously solved my last problem in record time: Now using Cabal 1.1.3, the permissions for globally installed packages go wrong. Even though I used umask 0000 for these procedures, the installed files had all no read permissons for no-roots. I think, this problem was not there with the cabal version shipped with ghc 6.4.1. I could work around it by hand, but maybe others have the same issues?

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RE: Cabal and hIDE
by Simon Marlow 29 Nov '05

29 Nov '05

On 29 November 2005 10:35, Bernd Brassel wrote: > Hello there, > > I try to install hIDE by cabal, but I got some problems. > First of all, it seems that I need a newer version of cabal than what > is shipped with ghc 6.4.1. According to the README of Cabal, 1.1.3 I > unregistered the older cabal first. But then I get lots of warnings > the like: > > > Distribution/Simple.hs:432:25: > > Warning: This binding for `pkg_descr' shadows an existing > binding > In the definition of `mockPP' > > > > Is this okay? Or should I have uninstalled something else (and how)? > > Trying to use the new cabal to install hIDE, "runhaskell Setup.lhs > configure" runs without error, but then: > > > runhaskell Setup.lhs build > > Preprocessing executables for hIDE-0.1.0... > > Building hIDE-0.1.0... > > ghc-6.4.1: ghc-6.4.1: panic! (the `impossible' happened, GHC > version > 6.4.1): > > unknown exception > > > > Please report it as a compiler bug to > > glasgow-haskell-bugs(a)haskell.org, > > or http://sourceforge.net/projects/ghc/. > > I guess, something went wrong, didn't it?... You probably have another package that depends on the old version of Cabal, and since you unregistered it the dependencies aren't satisfied. The error message is a bug in GHC 6.4.1 (now fixed), it should read something like "package Cabal-1.0 not found". A common package that depends on Cabal is hs-plugins; remove this an re-install it after removing Cabal-1.0 and you'll be fine. Cheers, Simon

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Cabal and hIDE
by Bernd Brassel 29 Nov '05

29 Nov '05

Hello there, I try to install hIDE by cabal, but I got some problems. First of all, it seems that I need a newer version of cabal than what is shipped with ghc 6.4.1. According to the README of Cabal, 1.1.3 I unregistered the older cabal first. But then I get lots of warnings the like: > Distribution/Simple.hs:432:25: > Warning: This binding for `pkg_descr' shadows an existing binding > In the definition of `mockPP' > Is this okay? Or should I have uninstalled something else (and how)? Trying to use the new cabal to install hIDE, "runhaskell Setup.lhs configure" runs without error, but then: > runhaskell Setup.lhs build > Preprocessing executables for hIDE-0.1.0... > Building hIDE-0.1.0... > ghc-6.4.1: ghc-6.4.1: panic! (the `impossible' happened, GHC version 6.4.1): > unknown exception > > Please report it as a compiler bug to > glasgow-haskell-bugs(a)haskell.org, > or http://sourceforge.net/projects/ghc/. I guess, something went wrong, didn't it?... Greetings Bernd

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Text.Html
by Jun Mukai 28 Nov '05

28 Nov '05

hello, haskellers Text.Html seems to generate HTML 3.2. It is too obsolete to use, isn't it? Are there any plans to support HTML 4.x or xhtml? It is true that WASH-HTML (and other libraries?) can generate xhtml. But the situation that the standard library supports legacy version of HTML only is bad. IMHO, the Text.Html should be rewrite to generate HTML 4.x, or the new library named Text.Xhtml should be introduced.

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