[Haskell-cafe] Installation Failed: Haskell Platform 2011.2.0.1-i386 for OS X
I'm running OS X 10.6.7, XCode 3.2.5. When I try to install The Haskell Platform 2011.2.0.1 for Mac OS X 10.6 (Snow Leopard) it goes all the way through to running package scripts, then says installation failed I did two separate downloads, and tried the first installation two time, the second download one time. Same result all three times. Is this a problem with the package, or ? Any suggestions? Thanks, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Haskell on iPad? (Scheme and Ocaml are there)
There are (at least) two Scheme interpreters for iPad at the iTunes store: PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces. There is also an Ocaml app, but I don't know or want to know Ocaml, and the interface looks very unfriendly. I'd really like to have something like this in Haskell, in the education pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable? John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell *interpreter* on iPad? (Scheme and Ocaml are there)
Well, I'm not interested in a lisp interpreter written in Haskell. Nor am I (at the moment) interested in writing an iPad app in Haskell. I changed the subject to clarify. What I would like to see is A Haskell Interpreter on the iPad. To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad. By the way, there are three Scheme interpreters in the iPad app store. In addition to the two I previously mentioned, there is iScheme. - John Velman On Sat, Jun 18, 2011 at 12:43:45PM -0400, Don Stewart wrote: See e.g. http://www.haskell.org/haskellwiki/IPhone http://www.haskell.org/haskellwiki/IPhone https://github.com/dpp/LispHaskellIPad https://github.com/dpp/LispHaskellIPad On Sat, Jun 18, 2011 at 12:18 PM, John Velman vel...@cox.net wrote: There are (at least) two Scheme interpreters for iPad at the iTunes store: PixieScheme and GambitREPL. Both allow entry of scripts, by typing or pasting. The Gambit community is very busy trying to expand the usefulness of their interpreter. Both have pretty good interfaces. There is also an Ocaml app, but I don't know or want to know Ocaml, and the interface looks very unfriendly. I'd really like to have something like this in Haskell, in the education pot, as is the GambitREPL. Hugs is written in C, if I recall correctly. Would it be possible to compile Hugs for the iPad processor, taking out enough system calls to make it acceptable? John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell *interpreter* on iPad? (Scheme and Ocaml are there)
On Sat, Jun 18, 2011 at 10:44:01PM +0400, MigMit wrote: Well, this is my point. THERE ARE 3 SCHEME INTERPRETERS in the iPad app store. They run on factory iPads, not jailbroken. The GUI for the gambitREPL (Read, Evaluate, Print, Loop) is just like a console. Input a scheme expression. CR. Answer appears, new prompt. In haskell we need to allow for some way to input layout. I don't recall how Hugs handles this, if at all. There are probably 5 or 10 people out there who want to learn functional programming, and they are studying Scheme on their iPads. Or Ocaml. I don't forsee doing production programming ON THE IPAD, but experimenting, testing some functions, and, by the way, learning Haskell. While I'm fantasizing, something like Hugs or ghci with SOE would really be neat. Sorry for shouting :-) John Velman Well, Haskell is fun, isn't it? And that's what iPhone is perfect for: fun. Back when I had iPod Touch 1G (jailbroken, of course), I used to run Hugs on it. Now I would love to see a Haskell interpreter in the App Store — which, by the way, is possible; as there are Scheme interpreters there, why not Haskell? Отправлено с iPhone Jun 18, 2011, в 22:27, Jack Henahan jhena...@uvm.edu написал(а): I suppose you could make a GUI, by why? Given that you'll have to be working on a jailbroken device, anyway, one could just as well use one of the numerous terminal emulators now floating around for jailbroken iOS. That said, the idea of people writing Haskell on phones and iPads and so on makes me just a little bit grinny. On Jun 18, 2011, at 2:17 PM, Alexander Solla wrote: On Sat, Jun 18, 2011 at 10:46 AM, John Velman vel...@cox.net wrote: To further emphasize, I'd like to type in (or paste in) Haskell code and have it executed on the iPad. To reiterate: Something like Hugs, or ghci on the iPad. Since the iPhone OS is pretty much OS X for ARM, and GHC apparently now supports cross-compilation, you can compile GHC for iOS. I guess you could cross compile Hugs with GCC. Doing so probably isn't trivial, but it should be straightforward. I bet you could even use Xcode to make a graphical user interface to GHCi. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskell platform questions
I had the same problem -- downloaded and installed the new Haskell Platform, and when I tried cabal I got the: dyld error. I'm also on OS X 10.5.8. Also, ghc users guide appears to be missing. I filed a bug report. To solve the cabal problem I got cabal-install version 0.9.0 using version 1.9.0 of the Cabal library from darcs, and put symlink to ~/.cabal/bin/cabal for /usr/local/bin/cabal Now I'm happy (so far) with ghc 6.12.1 and platform 2010.1.0.0 Best, John V. On Wed, Mar 24, 2010 at 03:36:46AM -0400, wren ng thornton wrote: Don Stewart wrote: You should file a bug on the Haskell Platform bug tracker. http://haskell.org/haskellwiki/Haskell_Platform#Trouble_shooting And I'm CC'ing the dmg maintainer -- it may also be a GHC issue as well. -- Don warrensomebody: I downloaded the new haskell-platform-2010.1.0.0-i386.dmg today... ran the uninstaller, ghc installer and the platform installer. When I run ghci, it seems to work fine, but when I try cabal, I get this crash: $ cabal --version dyld: unknown required load command 0x8022 Trace/BPT trap Same thing here. w...@semiramis:~ $ cabal --version dyld: unknown required load command 0x8022 Trace/BPT trap OSX = 10.5.8 CPU = Core 2 Duo -- Live well, ~wren ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] haskell platform questions
I'm also on Mac Leopard. I tried installing ghc 6.12 with Haskell Platform 2009.2.9.2-i386.dmg (ghc 6.10.4) for some reason, and ran into a bunch of problems (problems to me, anyway). I ended up uninstalling 6.12 and reinstalling haskell platform. Uninstall is easy, there is an uninstaller script in /Library/Frameworks/GHC.framework/Tools. (strangely, not in ..Frameworks/HaskellPaltform.framework). I'm still using Leopard, but would like to move to Snow Leopard once I get a few things out of the way. But I see that there are (or were) some tricks in getting ghc to work on OS X 10.6, apparently. These seem to be well documented, but, I'd rather spend the time on my own projects. Best, John V. On Wed, Mar 17, 2010 at 09:07:03PM -0700, Warren Harris wrote: I installed haskell platform some time ago, and now I'm wondering what version I have. How do I find out? Also, when the new one comes along on the 21st, is there a way to upgrade? Or if I must first uninstall the one I have now, how do I uninstall it? Is it recommended to periodically upgrade packages that came with the platform (cabal upgrade), or is it recommended that they be left alone to avoid dependency incompatibilities. Similar question for ghc itself -- can/should it be upgraded in the context of haskell platform? (I was hoping to try Leksah, but it dies without ghc 6.12.1. I seem to have 6.10.4.) Apologies in advance if this is all documented somewhere, but I couldn't find it on the haskell platform site/trac. BTW, I'm on Mac/Leopard -- love the fact that it didn't take hours to build everything! Warren ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [solved] Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
It's taken 21 days with interruptions, but I finally posted a tutorial with details of what I did on the Haskel Wiki. Category:Tutorials, title: Using Haskell in an Xcode Cocoa project Hope it's clear. Please send comments and suggestions. John V. On Thu, Oct 08, 2009 at 10:34:07AM +0200, Wouter Swierstra wrote: On 7 Oct 2009, at 23:39, John Velman wrote: For anyone following this: The XCode ld script is complex, and has mac specific defaults early in the search path specification, and I probably don't want to change these. A library in a default path is the wrong libgmp.[dylib | a]. Is there any chance you'll write up exactly what you needed to do on a blog/TMR article/Haskell wiki page? I've tried doing something similar, ran into linking problems, and gave up my fight with XCode. I think this would be a really useful resource for both Obj-C programmers looking into Haskell and Haskell programmers who want to have a fancy Cocoa GUI. Thanks! Wouter ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Cabal says no installed version of base
On Tue, Oct 27, 2009 at 09:28:39AM +, Duncan Coutts wrote:
On Wed, 2009-10-21 at 16:05 -0700, John Velman wrote:
I'm on OS X Leopard 10.5.8, using ghc 6.10.4 from Haskell Platform.
I'm trying to get a static .a library, callable from C, that I can use in
an OS X Cocoa program. I've tried a very simple case (the one in Haskell
Wiki Tutorials,calling haskell from C) I've managed to make a Mac Cocoa
application by adding the ghc generated .o program, plus adding one by one
the needed Haskell libraries for symbol not found to my Xcode project.
There should be a better way.
I've tried just about everything I could find on creating Haskell
libraries, with no joy. My latest try is to use Cabal, following advice
found both in How to write a Haskell program and the Cabal users guide.
My output from cabal -v configure tells me, among others:
Is that the full command you ran? No other flags or arguments? I'm
assuming you're using cabal-install version 0.6.2.
I checked results that I kept, and that was the full command. As I recall,
ghc-pkg didn't report any problem, but I don't recall whether or not it
listed in {}'s.
After posting this message, (and waiting for a while), I tinkered
considerably with my installation without any better results. I then
uninstalled, and reinstalled Haskell Platform.
I then went back to documenting what I actually did to get a working Cocoa
with Haskell function program running.
I'll try to redo the cabal version of library creation carefully, and check
the things you mention below, after I finish my documentation of my Cocoa
with Haskell test case.
Thanks,
John V.
According to the source it only produces that error in response to a top
level constraint passed on the command line. It internally adds such a
dependency, to make sure the solver never tries to pick a version of
base from hackage. The problem could be that your base package is broken
(missing dependencies) and thus the constraint on an installed base
cannot be satisfied.
When you run ghc-pkg list base, does it list it in {}'s? Does ghc-pkg
check report any problems?
Duncan
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[Haskell-cafe] Cabal says no installed version of base
I'm on OS X Leopard 10.5.8, using ghc 6.10.4 from Haskell Platform. I'm trying to get a static .a library, callable from C, that I can use in an OS X Cocoa program. I've tried a very simple case (the one in Haskell Wiki Tutorials,calling haskell from C) I've managed to make a Mac Cocoa application by adding the ghc generated .o program, plus adding one by one the needed Haskell libraries for symbol not found to my Xcode project. There should be a better way. I've tried just about everything I could find on creating Haskell libraries, with no joy. My latest try is to use Cabal, following advice found both in How to write a Haskell program and the Cabal users guide. My output from cabal -v configure tells me, among others: --- Reading installed packages... /usr/bin/ghc-pkg dump --global /usr/bin/ghc-pkg dump --user Reading available packages... Resolving dependencies... There is no installed version of base --- But when I do ghc-pkg dump --global it appears base is listed. Apparently, no installed version of base short circuits the whole process. Any suggestions, pointers to reading, whatever will be appreciated. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [solved] Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
On Thu, Oct 08, 2009 at 10:34:07AM +0200, Wouter Swierstra wrote: On 7 Oct 2009, at 23:39, John Velman wrote: For anyone following this: The XCode ld script is complex, and has mac specific defaults early in the search path specification, and I probably don't want to change these. A library in a default path is the wrong libgmp.[dylib | a]. Is there any chance you'll write up exactly what you needed to do on a blog/TMR article/Haskell wiki page? I've tried doing something similar, ran into linking problems, and gave up my fight with XCode. I think this would be a really useful resource for both Obj-C programmers looking into Haskell and Haskell programmers who want to have a fancy Cocoa GUI. Thanks! Wouter Yes, it is my intention to do just that. Unfortunately, I don't always follow through! But with a specific request, I'll try to get it done in the next few days. I'll post the url here. Best, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
This is probably an Xcode problem now, rather than a strictly Haskell problem. There are a bunch of libgmp.a and libgmp.dylib files in existence on this computer, some in /usr/local/lib, or linked from there. I've got my errors down to references in libgmp, whether or not I try to include libgmp.a in the project. Whenever I try to add libgmp.a, or libgmp.dylib to my project, I get the error message: -- ld warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/libgmp.dylib, file is not of required architecture - followed by a list of undefined symbols, all of which (well, all I've checked!) are defined in the Haskell Platform version of libgmp.a I'm sure there must be a way around this in the Xcode IDE, but haven't found it. I'll take the question to the Xcode mailing list. Thanks to all for help on this. I'll let you know how it works out! Best, John Velman On Tue, Oct 06, 2009 at 07:56:07PM -0400, Brandon S. Allbery KF8NH wrote: On Oct 6, 2009, at 19:20 , John Velman wrote: HSghc-prim-0.1.0.0.o, HSinteger-0.1.0.1.o, libffi.a, libgmp.a, libHSbase-3.0.3.1.a, libHSbase-3.0.3.1_p.a, libHSbase-4.1.0.0.a, libHSghc-prim-0.1.0.0_p.a, libHSrts.a Note that library order matters; libgmp.a should probably be last on the command line. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu electrical and computer engineering, carnegie mellon universityKF8NH [previous messages snipped to save virtual paper] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[solved] Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
For anyone following this: The XCode ld script is complex, and has mac specific defaults early in the search path specification, and I probably don't want to change these. A library in a default path is the wrong libgmp.[dylib | a]. My solution: do a ln -s libgmp.a lib-h-gmp.a in the /Library/Frameworks/GHC.Framework//usr/lib folder. Then add lib-h-gmp.a to my Xcode project. Compiled, linked, and ran and got the right output. Thanks to everyone who helped. John V. On Wed, Oct 07, 2009 at 10:38:53AM -0700, John Velman wrote: This is probably an Xcode problem now, rather than a strictly Haskell problem. There are a bunch of libgmp.a and libgmp.dylib files in existence on this computer, some in /usr/local/lib, or linked from there. I've got my errors down to references in libgmp, whether or not I try to include libgmp.a in the project. Whenever I try to add libgmp.a, or libgmp.dylib to my project, I get the error message: -- ld warning: in /Developer/SDKs/MacOSX10.5.sdk/usr/local/lib/libgmp.dylib, file is not of required architecture - followed by a list of undefined symbols, all of which (well, all I've checked!) are defined in the Haskell Platform version of libgmp.a I'm sure there must be a way around this in the Xcode IDE, but haven't found it. I'll take the question to the Xcode mailing list. Thanks to all for help on this. I'll let you know how it works out! Best, John Velman On Tue, Oct 06, 2009 at 07:56:07PM -0400, Brandon S. Allbery KF8NH wrote: On Oct 6, 2009, at 19:20 , John Velman wrote: HSghc-prim-0.1.0.0.o, HSinteger-0.1.0.1.o, libffi.a, libgmp.a, libHSbase-3.0.3.1.a, libHSbase-3.0.3.1_p.a, libHSbase-4.1.0.0.a, libHSghc-prim-0.1.0.0_p.a, libHSrts.a Note that library order matters; libgmp.a should probably be last on the command line. -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu electrical and computer engineering, carnegie mellon universityKF8NH [previous messages snipped to save virtual paper] ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Calling Haskell from C, Linking with gcc?
I think if I knew which libraries to add to the gcc link, I could make this work, but can't seem to find out from the documentation. Here are more specifics: I'd like to build a Cocoa program on OS X with the Aqua user interface using Xcode, but using a Haskell module with functions accessed through the foreign export interface. In fact this seems to fit in well with the Apple Model-View-Control programming pattern, with Haskell implementation of the Model, maybe some of the Control, and Cocoa implementation of the View and some of the Control. I've put together a short program (from the Wiki calling Haskell from C example) and compiling and linking with ghc it runs as advertised. As an experiment, I put the c main program into an Xcode project, added the haskell module .o and stub.o, stub.h files. Also added the HsFFI.h. Then did a build and run. As expected I got a bunch of missing entry points (26, if I recall correctly). Adding libffi.a and libHSrts.a brings me up to 56 missing entry points. Searching the other lib files for these seems pretty hopeless. Any pointers to documentation, or other help will be greatly appreciated! Thanks, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
On Tue, Oct 06, 2009 at 09:48:44AM -0700, Thomas DuBuisson wrote: Thanks, Thomas. Linking in only libffi.a, libgmp.a, I get (for example, there are many more) missing: _newCAF _base_GHCziBase_plusInt_closure _base_GHCziList_zzipWith_info _base_GHCziList_lvl5_closure by also linking in libHSrts.a, I no longer am missing _newCAF, (and others that were missing without it) but am missing a lot of _base_GHCzi... references. I've been unable to track these down. By the way, I can't find either a libc.a or libm.a on this machine using either locate or spotlight. Is there a way to guess which library things are in, short of doing an nm with some appropriate option on each .a file in the Haskell lib? Thanks, John V. Generally you should be able to tell which library you're missing based on the names of the undefined symbols. Have you link in... libgmp.a? libm.a? libc.a? What are the missing symbols? Thomas On Tue, Oct 6, 2009 at 9:44 AM, John Velman vel...@cox.net wrote: I think if I knew which libraries to add to the gcc link, I could make this work, but can't seem to find out from the documentation. Here are more specifics: I'd like to build a Cocoa program on OS X with the Aqua user interface using Xcode, but using a Haskell module with functions accessed through the foreign export interface. In fact this seems to fit in well with the Apple Model-View-Control programming pattern, with Haskell implementation of the Model, maybe some of the Control, and Cocoa implementation of the View and some of the Control. I've put together a short program (from the Wiki calling Haskell from C example) and compiling and linking with ghc it runs as advertised. As an experiment, I put the c main program into an Xcode project, added the haskell module .o and stub.o, stub.h files. Also added the HsFFI.h. Then did a build and run. As expected I got a bunch of missing entry points (26, if I recall correctly). Adding libffi.a and libHSrts.a brings me up to 56 missing entry points. Searching the other lib files for these seems pretty hopeless. Any pointers to documentation, or other help will be greatly appreciated! Thanks, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from C, Linking with gcc?
Thanks, Gregory. I did something like that. In particular, I did find . -name lib*.a | xargs nm ~/develop/haskellLibInfo/libInfo Then I used the output from the build results file to look for stuff in the libInfo file (using mac_vim). In this way I cut the number of undefined references down to 17 (from 56). The remaining references all seem (from the nm results) to be in libgmp.a, which I included in the project early in this experiment. The remaining ones are, for example: ___gmpz_init, ___gmpz_divexact, ___gmpz_tdiv_qr ... All are of the __gmpz variety. So far all that I've looked in my libInfo have entries something like: T ___gmpz_tdiv_qr I'm way out of my depth here. Here is a list of files I included in the project from /Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/... so far: HSghc-prim-0.1.0.0.o, HSinteger-0.1.0.1.o, libffi.a, libgmp.a, libHSbase-3.0.3.1.a, libHSbase-3.0.3.1_p.a, libHSbase-4.1.0.0.a, libHSghc-prim-0.1.0.0_p.a, libHSrts.a I'm using Haskell installed from haskell-platform-2009.2.0.2-i386.dmg (for OS X). Well, any further pointers will be highly appreciated. I'll have to sign off from this today, but hopefully will have more insights (from self and others) tomorrow. Best, John Velman On Tue, Oct 06, 2009 at 03:07:01PM -0400, Gregory Collins wrote: John Velman vel...@cox.net writes: On Tue, Oct 06, 2009 at 09:48:44AM -0700, Thomas DuBuisson wrote: Thanks, Thomas. Linking in only libffi.a, libgmp.a, I get (for example, there are many more) missing: _newCAF _base_GHCziBase_plusInt_closure _base_GHCziList_zzipWith_info _base_GHCziList_lvl5_closure by also linking in libHSrts.a, I no longer am missing _newCAF, (and others that were missing without it) but am missing a lot of _base_GHCzi... references. I've been unable to track these down. By the way, I can't find either a libc.a or libm.a on this machine using either locate or spotlight. Is there a way to guess which library things are in, short of doing an nm with some appropriate option on each .a file in the Haskell lib? $ cd /Library/Frameworks/GHC.framework/Versions/Current/usr/lib/ $ for i in `find . -name '*.a'`; do nm -a $i 2/dev/null | grep --label=$i -H 'D *_base_GHCziBase_plusInt_closure'; done ./ghc-6.10.4/base-4.1.0.0/libHSbase-4.1.0.0.a:008c D _base_GHCziBase_plusInt_closure ./ghc-6.10.4/base-4.1.0.0/libHSbase-4.1.0.0_p.a:010c D _base_GHCziBase_plusInt_closure G. -- Gregory Collins g...@gregorycollins.net ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] problems with HOC install from svn
I'm guessing the problem was with cabal's use of dlopen (see my inclusion of error message below). From some googling, the OS-X dlopen was redone by apple at some time and from results I obtained, seems to require dylib libraries unless (some things I don't understand). It seems that some earlier versions of GHC could use dylibs, but not 6.10. From some similar sounding issues I found in the issues part of the HOC site on code.google, I made a wild guess that using sudo runhaskell Setup.hs [options] might work. It did. I went all the way through the installation instructions using this procedure wherever the README file said cabal. Everything compiled, linked, and installed in global locations. Also compiled and linked one of the examples this way, and it seems to work. I'll submit an issue to the HOC site (if it will let me -- don't know about permissions for issues on this site). Thanks for your interest and help. John Velman On Tue, Sep 08, 2009 at 11:44:36PM -0400, Ross Mellgren wrote: I have binary-0.5 not binary-0.5.0.1, but it doesn't have any dylibs. Moreover, I was under the impression that GHC does not yet support shared libraries like those, so I'm not sure why it would be looking for one. I can't really speculate, maybe more of the build output might help? -Ross On Sep 8, 2009, at 10:54 PM, John Velman wrote: Thanks. Now I do have libHSbinary-0.5.0.1.a in /usr/local/lib, but apparently not the dylib version. Tomorrow I'll look further. Perhaps there are some options to produce dylib libraries. I've used Haskell on Linux some time ago (but not Cabal), and have been Xcoding with Objective C for a year or so now, but never tried this before. I am interested in HOC, but I've obviously got a lot to learn. Thanks again, John Velman On Tue, Sep 08, 2009 at 08:35:54PM -0400, Ross Mellgren wrote: It sounds like it's looking for the binary package -- you should install it using cabal, e.g. private (per-user) install: cabal update cabal install binary global (system-wide) install: sudo cabal update sudo cabal install --global binary -Ross On Sep 8, 2009, at 7:57 PM, John Velman wrote: I'm unable to build HOC from the svn read-only checkout. Here are some details of what I'm doing. I'm running OS X 10.5.8 on an intel iMac with Xcode is 3.1.3. Haskel and Cabal are from the Haskel platform, haskell-platform-2009.2.0.2-i386.dmg I got Parsec 3.0 from Hackage. I checked out HOC using the svn command at http://code.google.com/p/hoc/source/checkout and checked out revision 411. Configure goes OK except for the complaint: Setup.hs:1:0: Warning: In the use of `defaultUserHooks' (imported from Distribution.Simple): Deprecated: Use simpleUserHooks or autoconfUserHooks, unless you need Cabal-1.2 compatibility in which case you must stick with defaultUserHooks But when I try to build, I get, after a bunch of apparently successful things: --- Loading package binary-0.5.0.1 ... command line: can't load .so/.DLL for: HSbinary-0.5.0.1 (dlopen(libHSbinary-0.5.0.1.dylib, 9): image not found) --- I certainly can't find libHSbinary... of any version on my computer, dylib or not. Tried looking in the /Library/Frameworks/GHC.Framework stuff, also did a find . -iname *libHS* and found libHSGLFW..., libHSparsec-3.0.0. (also tried this in my home directory). What is this, and how do I get it? Best, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] problems with HOC install from svn
I'm unable to build HOC from the svn read-only checkout. Here are some details of what I'm doing. I'm running OS X 10.5.8 on an intel iMac with Xcode is 3.1.3. Haskel and Cabal are from the Haskel platform, haskell-platform-2009.2.0.2-i386.dmg I got Parsec 3.0 from Hackage. I checked out HOC using the svn command at http://code.google.com/p/hoc/source/checkout and checked out revision 411. Configure goes OK except for the complaint: Setup.hs:1:0: Warning: In the use of `defaultUserHooks' (imported from Distribution.Simple): Deprecated: Use simpleUserHooks or autoconfUserHooks, unless you need Cabal-1.2 compatibility in which case you must stick with defaultUserHooks But when I try to build, I get, after a bunch of apparently successful things: --- Loading package binary-0.5.0.1 ... command line: can't load .so/.DLL for: HSbinary-0.5.0.1 (dlopen(libHSbinary-0.5.0.1.dylib, 9): image not found) --- I certainly can't find libHSbinary... of any version on my computer, dylib or not. Tried looking in the /Library/Frameworks/GHC.Framework stuff, also did a find . -iname *libHS* and found libHSGLFW..., libHSparsec-3.0.0. (also tried this in my home directory). What is this, and how do I get it? Best, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] problems with HOC install from svn
Thanks. Now I do have libHSbinary-0.5.0.1.a in /usr/local/lib, but apparently not the dylib version. Tomorrow I'll look further. Perhaps there are some options to produce dylib libraries. I've used Haskell on Linux some time ago (but not Cabal), and have been Xcoding with Objective C for a year or so now, but never tried this before. I am interested in HOC, but I've obviously got a lot to learn. Thanks again, John Velman On Tue, Sep 08, 2009 at 08:35:54PM -0400, Ross Mellgren wrote: It sounds like it's looking for the binary package -- you should install it using cabal, e.g. private (per-user) install: cabal update cabal install binary global (system-wide) install: sudo cabal update sudo cabal install --global binary -Ross On Sep 8, 2009, at 7:57 PM, John Velman wrote: I'm unable to build HOC from the svn read-only checkout. Here are some details of what I'm doing. I'm running OS X 10.5.8 on an intel iMac with Xcode is 3.1.3. Haskel and Cabal are from the Haskel platform, haskell-platform-2009.2.0.2-i386.dmg I got Parsec 3.0 from Hackage. I checked out HOC using the svn command at http://code.google.com/p/hoc/source/checkout and checked out revision 411. Configure goes OK except for the complaint: Setup.hs:1:0: Warning: In the use of `defaultUserHooks' (imported from Distribution.Simple): Deprecated: Use simpleUserHooks or autoconfUserHooks, unless you need Cabal-1.2 compatibility in which case you must stick with defaultUserHooks But when I try to build, I get, after a bunch of apparently successful things: --- Loading package binary-0.5.0.1 ... command line: can't load .so/.DLL for: HSbinary-0.5.0.1 (dlopen(libHSbinary-0.5.0.1.dylib, 9): image not found) --- I certainly can't find libHSbinary... of any version on my computer, dylib or not. Tried looking in the /Library/Frameworks/GHC.Framework stuff, also did a find . -iname *libHS* and found libHSGLFW..., libHSparsec-3.0.0. (also tried this in my home directory). What is this, and how do I get it? Best, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Why Perl is more learnable than Haskell
On Wed, Apr 11, 2007 at 05:55:08AM -0700, kynn wrote: Perl is a large, ugly, messy language filled with quirks and eccentricities, while Haskell is an extremely elegant language whose design is guided by a few overriding ideas. (Or so I'm told.) Based on this one would think that it would be much easier to learn Haskell than to learn Perl, but my experience is exactly the opposite. Haskell useful to the learner as quickly as possible... If such already snip exist and I've missed it, please let me know. Or I can always wait until I retire; then I'll probably have a sufficiently long stretch of free time in my hands (barring any operations, strokes, heart attacks, hip fractures, etc.). I bet I could start a Haskell Wannabes Club at the nursing home... kj My experience is a lot like yours, except I retired 5 years ago, and still haven't learned Haskell. Unfortunately, I've had lots of interruptions that have kept me away from the keyboard. I've got a few unfinished projects, including one I started in Perl years ago, moved to Python, then moved to Haskell. The only useful thing I've programmed since I retired was a program to update my checkbook/bank statement postgresql database using Prolog for parsing entries the way I like to write them in a text file. Someday I'll move this to Haskell :-). I've sworn off other languages since I don't have any deadlines except my own. I never really learned Perl, but I used it a lot for simple one to thirty liners. The thing was, any thing I wanted to do I could find the bits and pieces of in Learning Perl, Programming Perl, or Learning Perl/TK. I have on my shelf Haskell: The craft..., The Haskell school of expression, and The Haskell road to Logic I've read them. I know I should sit down with each one at the computer and work through the exercises. But..,. When my current spate of unavoidable interruptions is over, I'll look into the email on Haskell one-liners, and some of the new tutorials to try to come back up to speed. Not in a nursing home yet! Good luck, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] What is a Boxed Array?
I've tried google and google scholar, wikipedia, and planetMath. Can't find a description. Can someone point me to a freely available reference? Thanks, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] What is a Boxed Array?
Thanks, this is very helpful. John Velman On Fri, Dec 09, 2005 at 02:29:33PM -0500, Cale Gibbard wrote: A box is a cell representing some value in a program. It generally ... ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Learning Haskell
I think you should take a look at some of the tutorial material you can find at www.haskell.org and jump in. For some reason there seems to be an affinity between Python and Haskell. Not clear to me why, since on the surface there is little similarity of syntax. If you think you might like it well enough to get a book, there are several good ones. I think Paul Hudack's The Haskell School of Expression might be a good start for you (I'm assuming that the SOEGraphics library is readily available. Once when I complained that I couldn't find it, someone told me I should have been able to!) Also, Simon Thompson's The Craft of Functional Programming is very good. Haskell should be good for doing small 'throw away' programs, once you get used to the IO. Caveats, and truth in advertising: 1. I'm pretty much a Haskell novice. Although I've lurked in the foothills here for some years, only recently have I had a chance to try to get up to speed for something relatively serious. 2. I intend to use Haskell for most of what I used to use Perl for, in the way of small programs. I haven't actually done this, since I haven't had the need. (I'm currently working on a parser for the Conceptual Graph Interchange Format (CGIF) -- which will be a small program itself, using Parsec. I hope to use it as part of a graphical CG editor, eventually. If I ever get time I intend to rewrite my Prolog/Postgresql bank statement tracking and reconciling program using Haskell/Postgresql, but that's a ways down on my list.) 3. I have been certified to have a strong math background :-), so take my advice with a grain of salt. I definitely don't understand monads, but can use them in a primative, unsophisticated way. I think if you can get along ok in Python and groan java script /groan you ought to be able to get along ok in Haskell. 4. If you want a GUI, there are several in the works but (as far as I know), none standard. I'm using HTk, because of an old slow machine and previous knowledge of tcl/Tk. I also tried developing a little drawing program with GTK2HS, but its development was moving too fast for me. wxHaskell is also pretty active. Others may have better advice. 5. Oh, and my platform is Linux. I used to use Hugs on Windows a long time ago when my job required Windows. Happy Haskelling! John Velman On Mon, Dec 05, 2005 at 04:26:20PM -0600, Jimmie Houchin wrote: Hello, I am exploring the possibility of learning Haskell. I am not a professional programmer, nor do I have a CS or Math degree. I do play and program with Python, Smalltalk (Squeak), Javascript, explored Erlang some. I do not have a strong math background. Is lack of strong math background a major hindrance to learning Haskell? Also, I understand Haskell's benefits for programming larger projects. But how does it do on programming in the small? ie: using Haskell where I might have used Python for scripting? Thanks for any help and wisdom. Jimmie Houchin ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell] Making Haskell more open
I agree with Gour. I found txt2tags as a result of a discussion on the GTK2HS list. It is simple to use, readable as is, or easily transformable to a variety of targets. Also, it is consistent with bird-track literate Haskell, so I can run my .lhs documents through txt2tags and get html, latex, pretty text, or a bunch of things I haven't tried yet including *.doc (msword) (the latter via txt2tags for html, soffice to go from html to *.doc). John Velman On Fri, Nov 11, 2005 at 06:29:24PM +0100, Gour wrote: Simon Marlow ([EMAIL PROTECTED]) wrote: We already use DocBook XML, and I'm relatively pleased with it, except for the fact that it's far from easy to set up a working DocBook toolchain on your system unless your OS of choice is up to date and has a well-maintained set of DocBook packages. I consider that the structure of the present ghc manual does not need such a rich markup as DocBook which is, imho, not very user-friendly. otoh, I'd prefer something simple (if you want to get contributions from more users) like 'txt2tags' (see e.g. http://txt2tags.sourceforge.net/screenshots.html) which enables one to do lot with very simple markup. There are many targets supported, light sys-reqs, cli gui, and even syntax highlighting for (g)vim, emacs, kate... Sincerely, Gour -- Registered Linux User | #278493 GPG Public Key| 8C44EDCD ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
[Haskell-cafe] Question about instance
Instance with a context doesn't seem to work as I expect.
Here's the story:
I define an data type, Relation, and I want to make it an instance of
Show, partly so I can debug and tinker with things interactively and have
ghci print something.
Here is my first try:
import Data.Set
type EN = String -- element name
type RN = String -- relation name
instance Show a = Show (Set a) where
show s = mkSet ++ show (setToList s)
data Relation = Relation {name::RN, arity::Int, members::(Set [EN])}
instance (Show a, Show i, Show b) = Show (Relation a i b)
where
show (Relation a i b) =
a ++ / ++ (show i) ++
++ (show b)
When I try to load this into ghci, I get:
---GHCI:
*Main :l test.hs
Compiling Main ( test.hs, interpreted )
test.hs:14:
Kind error: `Relation' is applied to too many type arguments
When checking kinds in `Relation a i b'
When checking kinds in `Show (Relation a i b)'
In the instance declaration for `Show (Relation a i b)'
Failed, modules loaded: none.
Prelude
---END GHCI
But, when I define showRelation separately, then leave the context out of
the instance declaration with show = showRelation it works:
---(Everything down to the instance declaration is the same)
instance Show Relation
where
show = showRelation
showRelation:: Relation - String
showRelation (Relation a i b) =
a ++ / ++ (show i) ++
++ (show b)
---
Now I get:
--- GHCI output:
Prelude :l test.hs
Compiling Main ( test.hs, interpreted )
Ok, modules loaded: Main.
*Main mkRelation1 test 2 [[one,two], [three,four]]
test/2 mkSet [[one,two],[three,four]]
*Main
-- End GHCI
Why does the original instance declaration result in failure and the
message Kind error: `Relation' is applied to too many type arguments (I
confess to not understanding 'kinds' too well.)
I've done a bit of tinkering with the original version, and have tried the
second version with a context in the instance declaration, but none of my
attmepts work. The only one that worked was the one shown, with no context
in the instance declaration. Needless to say (?), I've tried to
understand this from reading in the Haskell 98 report, `Haskell school of
Expression', and any place else I can think of, but I'm missing the point
somewhere.
Thanks,
John Velman
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Re: [Haskell-cafe] Question about instance
Thanks, Andreas. Your example still left me without context in the show
statement itself, but your message set me to look in the right place.
Now I have
--- Code
data Relation a i b = Rel {name::RN, arity::Int, members::(Set [EN])}
instance (Show a, Show i, Show b) = Show (Relation a i b)
where
show (Rel a i b) =
a ++ / ++ (show i) ++
++ (show b)
---
with result:
---GHCI
Prelude :l test.hs
Compiling Main ( test.hs, interpreted )
Ok, modules loaded: Main.
*Main mkRelation1 test 2 [[one,two], [three,four]]
test/2 mkSet [[one,two],[three,four]]
*Main
---End GHCI
It's hard to find examples like this, and the fact that it is fairly
standard practice for the type name and constructor names to be the same
in, for example, Gentle Haskell, and Haskell School of Expression make it
more difficult for the novice to see when each is used!
Best,
John Velman
On Fri, Jan 14, 2005 at 01:49:57AM +0100, Andreas Marth wrote:
If you replace
data Relation = Relation {name::RN, arity::Int, members::(Set [EN])}
with
data Relation = Rel {name::RN, arity::Int, members::(Set [EN])}
you will easy find out what is wrong and come to:
import Data.Set
type EN = String -- element name
type RN = String -- relation name
instance Show a = Show (Set a) where
show s = mkSet ++ show (setToList s)
data Relation = Rel {name::RN, arity::Int, members::(Set [EN])}
instance Show (Relation)
where
show (Rel a i b) = a ++ / ++ (show i) ++ ++ (show b)
Of course you can now change Rel back to Relation. But because of the
problems you just experienced I don't like it to name a type and its
constructor the same.
Happy coding,
Andreas
- Original Message -
From: John Velman [EMAIL PROTECTED]
To: haskell-cafe@haskell.org
Sent: Friday, January 14, 2005 1:29 AM
Subject: [Haskell-cafe] Question about instance
Instance with a context doesn't seem to work as I expect.
Here's the story:
I define an data type, Relation, and I want to make it an instance of
Show, partly so I can debug and tinker with things interactively and
have
ghci print something.
Here is my first try:
import Data.Set
type EN = String -- element name
type RN = String -- relation name
instance Show a = Show (Set a) where
show s = mkSet ++ show (setToList s)
data Relation = Relation {name::RN, arity::Int, members::(Set [EN])}
instance (Show a, Show i, Show b) = Show (Relation a i b)
where
show (Relation a i b) =
a ++ / ++ (show i) ++
++ (show b)
When I try to load this into ghci, I get:
---GHCI:
*Main :l test.hs
Compiling Main ( test.hs, interpreted )
test.hs:14:
Kind error: `Relation' is applied to too many type arguments
When checking kinds in `Relation a i b'
When checking kinds in `Show (Relation a i b)'
In the instance declaration for `Show (Relation a i b)'
Failed, modules loaded: none.
Prelude
---END GHCI
But, when I define showRelation separately, then leave the context out of
the instance declaration with show = showRelation it works:
---(Everything down to the instance declaration is the same)
instance Show Relation
where
show = showRelation
showRelation:: Relation - String
showRelation (Relation a i b) =
a ++ / ++ (show i) ++
++ (show b)
---
Now I get:
--- GHCI output:
Prelude :l test.hs
Compiling Main ( test.hs, interpreted )
Ok, modules loaded: Main.
*Main mkRelation1 test 2 [[one,two], [three,four]]
test/2 mkSet [[one,two],[three,four]]
*Main
-- End GHCI
Why does the original instance declaration result in failure and the
message Kind error: `Relation' is applied to too many type arguments (I
confess to not understanding 'kinds' too well.)
I've done a bit of tinkering with the original version, and have tried the
second version with a context in the instance declaration, but none of my
attmepts work. The only one that worked was the one shown, with no
context
in the instance declaration. Needless to say (?), I've tried to
understand this from reading in the Haskell 98 report, `Haskell school of
Expression', and any place else I can think of, but I'm missing the point
somewhere.
Thanks,
John Velman
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Re: [Haskell-cafe] Problem with wxHaskell
Your code works fine on Linux. :-) Oh, by the way, I compiled my wxHaskell with GHC 6.2.2 I note that the windows binary on the download site was compiled with GHC 6.2.1, and apparently these are not binary compatible with GHC 6.2.2. Best, John Velman On Wed, Jan 12, 2005 at 04:16:33PM +0100, Dmitri Pissarenko wrote: Hello! I've downloaded wxHaskell, ran the wxhaskell-register.bat file and now try to build a minimal wxHaskell program. For this purpose, I tried to start GHCi using following command ghci -package wx GuiTest.hs GHCi crashed with following error messages: error-messages GHC Interactive, version 6.2.2, for Haskell 98. http://www.haskell.org/ghc/ Type :? for help. Loading package base ... linking ... done. Loading package haskell98 ... linking ... done. Loading package lang ... linking ... done. Loading package concurrent ... linking ... done. Loading package QuickCheck ... linking ... done. Loading package readline ... linking ... C:/ghc/ghc-6.2.2/HSreadline.o: unknown symbol `_rl_redisplay_function' ghc.exe: unable to load package `readline' /error-messages What am I doing wrong? TIA Dmitri Pissarenko PS: Here is the code of the application module Main where import Graphics.UI.WXCore main :: IO () main = run gui gui :: IO () gui = do frame - frameCreateTopFrame Hello World windowShow frame windowRaise frame return () -- Dmitri Pissarenko Software Engineer http://dapissarenko.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Information given by :info (Was: Some randomnewbie questions)
On Tue, Jan 11, 2005 at 12:21:35PM -, Simon Marlow wrote: On 10 January 2005 10:26, Sebastian Sylvan wrote: On Mon, 10 Jan 2005 10:30:46 +0100 (MEZ), Henning Thielemann [EMAIL PROTECTED] wrote: What I also would like to see is the Haddock documentation string of a function printed by :info or some other command. SWI Prolog has a predicate, apropos of arity 1. When appropos(xxx) is invoked from the interactive console (which is comparable to the HUGS of GHCi console), a new process is started in a window. The window has two panes one with a table of contents tree for the manual, one with brief descriptions of the predicate xxx. There is also an entry box for a new search, and a menu. It seems that it wouldn't be too hard to put together something similar that would work from either the HUGS or GHCi console. It would be too large a project of me at the moment :-). SWI Prolog uses XPCE, which is distributed with SWI Prolog, for the GUI. Best, John Velman Now _that_ would be truly useful. It's not perfect, but it's better than nothing: :def doc (\s - let (rvar,rmod) = break (=='.') (reverse s); var = reverse rvar in System.Cmd.system (mozilla http://www.haskell.org/ghc/docs/latest/html/libraries/base/; ++ reverse rmod ++ html# ++ (if (Data.Char.isUpper (head var)) then t: else v:) ++ var) return ) eg. Prelude :doc Prelude.head You have to use a qualified name, it only works in package base, and you can't look up data constructors. Any hackers out there want to try lifting these restrictions? Cheers, Simon ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Building GUIs for Haskell programs
Here is an answer from a newbie at both Haskell and GUI -- I don't think there is a simple answer. It probably depends on your experience, your development platform, and where you want to be able to distribute your application to. I would say that wxHaskell is probably a good choice. It depends on wxWindows, which seems to be fairly well developed, and is said to work on all reasonable platforms. Here is my story: I've done little GUI programming -- some MS Visual C++ and visual basic years ago, a little perlTK more recently. I have some familiarity with TCL/TK from my perlTK experience. I'm developing on a Linux platform (Slackware 9) and have GHC 6.2.2. I looked at, and tried several of the Haskell libraries as listed at http://www.haskell.org/libraries/#guis Because of my previous experience with TCL/TK, I wanted to use a TK based solution initially. I had problems (I've forgotten what :-) with TCLHaskell, and went on to HTk. The HTk package seems pretty nice, but probably because of my inexperience with Haskell, I found it difficult to understand. wxHaskell seems to be the most popular vehicle, so I decided to look into it, partly based on some advice I got from this list. I had no trouble compiling and installing wxWindows (specifically, wxGTK-2.4.2). I also compiled from source wxHaskell with no problem. Although the documentation is a bit cryptic (for my level of experience, at least), and even though I have no past experience with wxWindows, I am able to figure out how to do what I want to do, so far. So, based on my experience, I can recommend wxHaskell. Best regards, John Velman On Tue, Jan 11, 2005 at 09:05:43PM +0100, Dmitri Pissarenko wrote: Hello! I want to learn to create GUIs with Haskell. Which GUI frameworks can you recommend? Thanks Dmitri Pissarenko -- Dmitri Pissarenko Software Engineer http://dapissarenko.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GUI
On Mon, Dec 27, 2004 at 11:44:49AM +0100, Arjan van IJzendoorn wrote: However, I want to know if there has been any practical standardisation in the GUI area. Last time I looked at this it seemed some decisions had been made (bind to existing api - wxWindows?). I am waiting for some real standardisation and a mature API before I jump ship from Java for my day-to-day programming. wxHaskell is available at http://www.wxhaskell.sfnet.org/ It runs on Windows, Linux and MacOS X. It has many GUI controls, database access, is well documented and ...[snip] --^^^ Well documented is relative to the background of the user. As a Haskell novice who has no prior experience with wxWindows, I have found the documentation a little bit sparse! For example, the device context (dc) of the widget where an event occurs is apparently passed (by the wxHaskell routines) to the user written callback function for that event. I had a need for the dc of a different widget in a certain callback. I stumbled onto the function withClientDC more or less by accident. I'd like to be able to output my drawing in PostScript. Based on some wxWindows examples, and some function signatures in the wxHaskall documentation, I believe I'll eventually be able to do this, but expect to have to do some heavy digging and reading of a certain amount of C++ code in order to figure out how. This is not a complaint, just a warning to the novice. Don't expect anything like Python's TKInter Life Preserver. I am fairly happy with wxHaskell and get happier with it as I get to understand it better. I'm grateful for the work Daan and others have put into wxHaskell. wxHaskell does have extensive Haddock documentation, the Wiki has a very good wxHaskell page (as far as it goes), and Daan's paper wxHaskell A Portable and Concise GUI Library for Haskell is excellent. I understand that writing documentation for the novice is time consuming. I hope to add some comments to the Wiki for other beginers when I get a little further along. Best, John Velman ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: Top Level TWI's again was Re: [Haskell] Re: Parameterized Show
On Mon, Nov 22, 2004 at 07:27:44PM +0100, Lennart Augustsson wrote: [snip] I admit there are proper uses of global variables, but they are very rare. You have not convinced me you have one. -- Lennart It's with some trepidation I bring a problem as a total newbie, but I've been obsessed with this and hung up on it ever since I decided a couple of weeks ago to learn Haskell by using it. Some brief background: A while back I decided I wanted a simple 'concept mapping' program that would work the way I work instead of the way someone else works. I envisioned a GUI with a canvas and an entry box (TK/tcl). I type a concept name into the entry box, and it shows up on the canvas (initially in a slightly randomized position), in a box, with a unique sequenced identifier. The identifier is also used as a canvas tag for the item. Similar input for relations between concepts. I think that's enough description for now. Initially, I started programming this with PerlTK, but that effort was interrupted for a few weeks. When I got back to it, I decided to do it in Python instead. But that effort also got interrupted for a few weeks. Before I got back to it, I ran across some material on Haskell I've had in my files for a few years, and decided that I'd use this as a vehicle to actually learn Haskell. (This all sounds a bit unfocused, and it is: I'm retired, sometimes describe myself as an ex mathematician or an ex-PhD having spent years in the aerospace industry instead of academia. Anyway, I have both the luxury and lack of focus of no deadlines, no pressure to publish. I hope to use Haskell to further my main hobby of knowledge representation.) In perl, my labels/tags were very easy: In the initialization code: my @taglist = (); my $nextag = a; and in the callback for the entry box: push(@taglist,$nextag); $nextag++; (With the starting tag of a this results in a,z,aa,ab,...) Also, ultimately, I want to be able to save my work and restart the next day (say) picking up the tags where I left off. I'm darned if I can see how to do this in a callback without a global variables (and references from other callbacks, by the way). In looking for a method, I've discovered that Haskell is a lot richer than I thought (or learned when I tinkered with it back in the late '90s ). I've found out about (but don't know how to use properly) implicit parameters, linear implicit parameters, unsafePerformIO, safe and sound implementation of polymorphic heap with references and updates (Oleg Kiselyov, (http://www.haskell.org/pipermail/haskell/2003-June/011939.html), implicit configurations, phantom types, ... I've also found warnings against many of these. I'm inclined to try the unsafePerformIO route as being the simplest, and most commonly used, even though perhaps the least haskell-ish. I like implicit configurations, but couldn't begin to say I understand them yet, and it's a bit heavy for a novice. In a nutshell: I want to use the old value of a tag to compute the new value, in a callback, I want to access the tag from other callbacks, and I want to the value to a mutable list from within the callback. I'd certainly be interested in doing without global variables, and would appreciate any advice. (By the way, I'm using Linux, and so far it looks like HTk is my choice for the GUI interface.) Best, John Velman ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
Re: [Haskell] implicit parameters and the paper prepose.pdf
Thanks to everyone who answered! I now have a copy. Best to all, John Velman ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
[Haskell-cafe] Examples using STRef
I want to label items on a canvas (using HTk for gui) with a sequence of labels. It looks like STRef would provide the right capability. (Needless to say, at this point, I'm new at using Haskell and am trying to swallow everything at once.) Are there some examples of programs using STRef? I'd like examples that are not too complicated, but not too simple, either. :-) Thanks, John Velman ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: New InstallShield: Free At Last
This sounds good. One question: Can this live gracefully with an already complete Cygwin installation? I.e., will I automatically end up with two versions of bash, mv, cp, and so on, and can they live together? Thanks, John Velman Reuben Thomas [EMAIL PROTECTED]@haskell.org on 04/23/2001 03:41:12 AM Sent by: [EMAIL PROTECTED] To:GHC users mailing list [EMAIL PROTECTED] cc: Subject: New InstallShield: Free At Last I've uploaded a new InstallShield for GHC 4.08.2 for Windows which includes *all* the programs required to use and even rebuild GHC from source [GHC developers should note that it doesn't include everything needed to build from CVS; see the most recent 5.00 docs in CVS for details]. This means that there's no longer any need to install Cygwin. Since GHC needs bash to work, and building it requires mv, rm and cp, plus many other basic utilities, you get a reasonably nice minimal command-line environment anyway; I've added ls to the mix for extra comfort. Although the InstallShield is now 20M, overall there's far less to download, and now GHC should break far less often. Another implication of this development is that the Windows version of 5.00 should now happen sooner rather than later. One caveat: the installation instructions on haskell.org are now somewhat out of date. I'll try to correct that soonish. -- http://sc3d.org/rrt/ | Si hoc legere scis nimium eruditionis habes. ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Dimensional analysis with fundeps
1) What is a fundep? 2) This is a very interesting topic, and rather complex. It has come up (dimensions, units, -- not Haskell implementations of them) in some recent work on STEP (ISO 10303). I'm only now trying to come up to some speed on Haskell, and only now trying to recall what I used to know about the algebra of units and dimensions, so I'm not really prepared to comment deeply on this suggestion. However, I'd suggest that someone have a good long look at "An Ontology for Engineering Mathematics" (available at http://www-ksl.stanford.edu/KSL_Abstracts/KSL-94-18.html) (or similar work) before building anything in to standard libraries. John Velman Tom Pledger [EMAIL PROTECTED]@haskell.org on 04/09/2001 02:48:48 PM Sent by: [EMAIL PROTECTED] To:anatoli [EMAIL PROTECTED], [EMAIL PROTECTED] cc: Subject: Dimensional analysis with fundeps I like it! : | 3) Allow arbitrary user-defined "fundamental" dimensions |(for things like dollars or radians) -- this may be |very tricky; | | 4) Allow several unit systems (such as SI and Imperial) |to coexist. Some suggestions/quibbles... If you clearly make the type system deal with dimensions rather than units, there's no problem with plugging in multiple unit systems. You just have to pick a scale for the representation. newtype Dimensioned mass length time rep = Dimensioned rep type Mass rep = Dimensioned One Zero Zero rep kg, lb :: Num a = Mass a kg = dm 1 lb = dm 0.4535924 Angles are dimensionless. (Think of the Taylor series for trig functions.) radian, degree :: Unit radian = dm 1 degree = dm (pi/180) Regards, Tom ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
