Re: [Haskell-cafe] Testing invasive proposals with Hackager
To make it clear, it's not yet written, although I'll start spending more time on it soon. So far I've been working on the haskell-suite set of libraries that are necessary to implement HasFix. (https://github.com/haskell-suite) Roman * AlanKim Zimmerman alan.z...@gmail.com [2013-06-13 20:45:43+0200] Roman Cheplyaka has written a tool called HasFix for updating source based on new versions of libraries. The presentation on it is here http://ro-che.info/docs/ and the code is at https://github.com/feuerbach/hasfix Perhaps it could be pressed into use for automatic update of historical code? Alan On Thu, Jun 13, 2013 at 6:30 PM, Maksymilian Owsianny maksymilian.owsia...@gmail.com wrote: I was thinking about something similar some time ago, but not just testing but also fixing things automatically. Taking for example Semigroup = Monoid this would break in places where you have instance for Monoid but don't have instance for Semigroup. But if you have instance for Monoid making instance for Semigroup is straightforward: instance Semigroup TypeYouAreFixing where () = copy code from mappend for that type I'm still kind of new to Haskell, so I'm not sure how hard such, TemplateHaskell-like automagic migration tool, would be to make, but I feel like such a tool would be of incredible importance for the community. Because otherwise, without such thing, there are usually two ways a language can evolve: 1. Caring for backwards compatibility, and accumulating mistakes like that over time, and becoming more and more like crap. 2. Making fixes that break everyones code, and because of that being ignored by the industry. I like Haskell because it usually takes the second route, but as community grows it will be less and less the case. With such a tool you could have best of both worlds. Though I assume that somebody already thought of that and come to the conclusion that in general case you cannot make such tool because Gödel is a bastard that breaks everyones toys, or something along this lines. On Thu, Jun 13, 2013 at 12:54 PM, Niklas Hambüchen m...@nh2.me wrote: On 13/06/13 18:36, Vo Minh Thu wrote: For example, here is a run with GHC, no special options and using 4 threads (note that this generally takes a long time, i.e. a few days): My builds finished in 10 hours on an i7. ___ 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 ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN: Nomyx 0.2 beta, the game where you can change the rules
Hello everybody! Here it comes, the second beta release [1] of Nomyx, the only game where You can change the rules!! This is an implementation of a Nomic [2] game in Haskell (I believe the first complete implementation of a Nomic game on a computer). In a Nomyxgame you can change the rules of the game itself while playing it. The players can submit new rules or modify existing ones, thus completely changing the behaviour of the game through time. The rules are managed and interpreted by the computer. They must be written in the Nomyx language, which is a subset of Haskell. At the beginning, the initial rules are describing: - how to add new rules and change existing ones. For example a unanimity vote is necessary to have a new rule accepted. - how to win the game. For example you win the game if you have 5 rules accepted. But of course even that can be changed! Here is a video introduction and first tutorial of the game: http://vimeo.com/58265498 The game is running here: www.nomyx.net:8000/Nomyx I have set up a forum where players can learn about Nomyx and discuss the rules they intend to propose: www.nomyx.net/forum The example file gives a lot of examples of rules that you can submit: www.nomyx.net:8000/src/Language/Nomyx/Examples.hs Changes from V0.1: - new login system: you can now login with your Google, Yahoo, Live Journal, Myspace, OpenId or Facebook accounts (thanks to happstack-authenticate)! - new DSL for voting (see below) - styling: rule code colorized, better settings and help - use cookies to store the user ID (as suggested on this mailing list) - new error system to handle exceptions in rules (with ErrorT) - use lenses I set up a little DSL to create elections (elect one of the players for a special role) or referendums (a yes/no question). You create in one line within Nomyx an vote with unanimity or majority, a quorum and different ballot systems. See here: http://www.nomyx.net/forum/viewtopic.php?f=3t=1518 Let's test it! If you are interested, please go to this forum thread and we'll set up a small team to start a match! http://www.nomyx.net/forum/viewtopic.php?f=4t=1517 The demo game is running here: www.nomyx.net:8000/Nomyx then select game demo2. As the first player of the game, I changed the initial unanimity vote to a simple majority, with a minimum of 2 players voting. Having your new rules accepted will be easy! Let's see who will win :) Cheers, Corentin [1] http://hackage.haskell.org/package/Nomyx [2] www.nomic.net ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell Platform 2013.2.0.0 64bit.pkg
On 06/13/2013 02:13 AM, Richard A. O'Keefe wrote: My original problem was that I wanted to load a particular set of packages using 'cabal install'. It didn't work (cabal install issues) and while the maintainer reacted promptly and helpfully, cabal kept on trying to install the wrong version. Part of the problem was that blasting away ~/.cabal and ~/Library/Haskell wasn't enough: it's necessary to blast away ~/.ghc as well (which I had forgotten existed and of course never saw). * It would be handy if 'uninstall-hs' had an option, say * uninstall-hs --user * so that a user could in one step make it as if they had never * used the Haskell Platform. (Sigh. Changes to the GHC command line interface since 7.0 have broken one of the packages I used to have installed, and the maintainer's e-mail address doesn't work any more. And sometimes it seems as if every time I install anything with cabal something else breaks.) PS. Earlier today cabal gave me some confusing messages which turned out to mean 'GSL isn't installed'. Non-Haskell dependencies could be explained a little more clearly. This doesn't offer an immediate solution to your problem, but as of right now, the best set of blessed Haskell packages can be found in the gentoo-haskell[1] overlay. You can use Gentoo's portage package manager and the overlay on many operating systems (OSX included) via the gentoo-prefix[2] project, which builds you an entire Gentoo system in e.g. ~/prefix. It's then easy to get packages added to the overlay, and tested against the rest of the packages in Gentoo (which is what everything will be compiled against). There's also support in portage for automatically rebuilding packages whose dependencies have been broken by an upgrade, which prevents a huge amount of breakage. Some good docs on getting a Haskell system up and running on prefix would be a big help for anyone who wants an ecosystem that will work for a few years. Right now the documentation for prefix isn't great, but as I understand it the project docs are going to be moved to the Gentoo wiki, and us mere mortals will be able to update the instructions. Right now you need CVS access, and nobody knows how the documentation XML nonsense works. Burcin Erocal has an interesting project called lmonade[3] which simplifies this for other projects, so it doesn't need to be painful. [1] https://github.com/gentoo-haskell/ [2] http://www.gentoo.org/proj/en/gentoo-alt/prefix/ [3] http://www.lmona.de/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
