Re: [Haskell-cafe] cabal configure cabal build cabal install
Brent Yorgey byor...@seas.upenn.edu writes: On Sun, Nov 25, 2012 at 06:09:26PM -0500, Albert Y. C. Lai wrote: If you begin with cabal configure, the correct idiom is: cabal configure [flags] cabal build [cabal haddock, if you want] cabal copy cabal register Even this does not do the same thing as 'cabal install', because it does not download and install any dependencies (whereas 'cabal install' does). ...but if he prepended a 'cabal install --only-dependencies' to the invocation sequence it would, wouldn't it? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] cabal configure cabal build cabal install
Nice tip, Albert! Good to know! One question I have is, is (runghc Setup.lhs) equivalent to (cabal) in runghc Setup.lhs $ [configure, build, install] ? On Mon, Nov 26, 2012 at 8:08 AM, Brent Yorgey byor...@seas.upenn.eduwrote: [cabal haddock, if you want] cabal copy cabal register Even this does not do the same thing as 'cabal install', because it does not download and install any dependencies (whereas 'cabal install' does). Brent, that's useful to know too, thanks! Fwiw, I think Albert had the backdrop of classic GNU autoconf in mind, predating all that newfangled stuff of downloading (!) dependencies (!!). -- Kim-Ee -Brent ___ 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] Equality test between types that returns type-level Bool ?
If you're up for it, Oleg has a lot of interesting material about this subject [1]. Regards, Erik [1] http://okmij.org/ftp/Haskell/typeEQ.html On Sun, Nov 25, 2012 at 9:36 AM, Takayuki Muranushi muranu...@gmail.comwrote: Is it possible to write type family SameType a b :: Bool which returns True if a and b are the same type, and False otherwise? I encountered this problem when I was practicing promoted lists and tuples in ghc-7.6.1. One of my goal for practice is to write more modular version of extensible-dimensional calculations, and to understand whether ghc-7.6.1 is capable of it. http://hackage.haskell.org/packages/archive/dimensional/0.10.2/doc/html/Numeric-Units-Dimensional-Extensible.html Some of my attempts: https://github.com/nushio3/dimensional-tf/blob/master/attic/list-02.hs This fails because :==: is not an equality test between a and b, but is a equality test within a (promoted) kind. https://github.com/nushio3/dimensional-tf/blob/master/attic/list-03.hs This fails because type instance declarations are not read from top to bottom. (not like function declarations.) https://github.com/nushio3/dimensional-tf/blob/master/attic/map-03.hs I could define a lookup using class constraints, but when I use it, results in overlapping instances. So, will somebody teach me which of the following is correct? * We can write a type family SameType a b :: Bool * We cannot do that because of theoretical reason (that leads to non-termination etc.) * We cannot write SameType, but there are ways to write functions like 'filter' and 'merge' , over type-level lists, without using SameType. Always grateful to your help, -- Takayuki MURANUSHI The Hakubi Center for Advanced Research, Kyoto University http://www.hakubi.kyoto-u.ac.jp/02_mem/h22/muranushi.html ___ 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] Observer pattern in haskell FRP
Hey, When writing games in other (imperative) languages, I like to separate the game logic from the rendering. For this I use something similar to the observer pattern. With rendering I mean anything only related to how objects are drawn to the screen. Animation state for example. On my journey of exploring game programming with haskell (and FRP), I wonder what a good way of archiving something similar would be. If the rendering has no internal state, one can just write a function draw :: GameLogicState - IO () But when the rendering of an object has an internal state (e.g. animation frame) than this is not possible. Now I could write a Wire/Signal (whatever FRP implementation I use) that translates to a RenderingState: render :: Signal GameLogicState RenderingState draw :: RenderingState - IO () which is fine, except when my game is made of many objects. Than I need to associate the state of one object in GameLogicState with a sub-signal in render. That could be done by giving every object an ID and letting GameLogicState contain a map from IDs to ObjectLogicState. I fear that when I really have a lot of objects, assembling and decomposing the map could become a major bottleneck. So I am wondering: Is there (or can someone think of) a different pattern by which this could be archived? Or asked different: How would you do it? Thanks! Nathan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] cabal configure cabal build cabal install
On 12-11-26 04:34 AM, Kim-Ee Yeoh wrote: Nice tip, Albert! Good to know! One question I have is, is (runghc Setup.lhs) equivalent to (cabal) in runghc Setup.lhs $ [configure, build, install] ? Setup defaults to --global --prefix=/usr/local cabal defaults to --user --prefix=$HOME/.cabal This confuses a lot of people. FAQ #1: Why does Setup copy abort and say no permission? Answer: because you haven't escalated privilege for writing to /usr/local FAQ #2: Why does sudo cabal install register nothing in both the global database and my database? Answer: because --user means not global, and sudo means the user is root, not you. Look under /root. Lastly, there is no Setup install. Use copy and register. On Mon, Nov 26, 2012 at 8:08 AM, Brent Yorgey byor...@seas.upenn.edu mailto:byor...@seas.upenn.edu wrote: [cabal haddock, if you want] cabal copy cabal register Even this does not do the same thing as 'cabal install', because it does not download and install any dependencies (whereas 'cabal install' does). Brent, that's useful to know too, thanks! Fwiw, I think Albert had the backdrop of classic GNU autoconf in mind, predating all that newfangled stuff of downloading (!) dependencies (!!). This is ignorant of a common workflow. cabal configure is used by a lot of programmers. Today. Why? Because they use it on their own projects. They use cabal-install as a builder, not exactly an installer. In fact, some of them do: cabal configure cabal build cabal register --inplace This has no cabal install correspondence. So you ask, but surely their own projects require some packages from hackage? Yes, surely. But those packages have already been installed in the past, once and for all. That is, when the project started, they already did cabal install yesod. This is not so old-school, is it? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Equality test between types that returns type-level Bool ?
Dear Gábor, Erik, and Oleg, Thank you for your advices. Also what I have wanted, the extensible dimensional type system, has just been released. http://hackage.haskell.org/package/unittyped-0.1 Now I have homeworks to test these, thank you! 2012/11/27 Erik Hesselink hessel...@gmail.com If you're up for it, Oleg has a lot of interesting material about this subject [1]. Regards, Erik [1] http://okmij.org/ftp/Haskell/typeEQ.html On Sun, Nov 25, 2012 at 9:36 AM, Takayuki Muranushi muranu...@gmail.comwrote: Is it possible to write type family SameType a b :: Bool which returns True if a and b are the same type, and False otherwise? I encountered this problem when I was practicing promoted lists and tuples in ghc-7.6.1. One of my goal for practice is to write more modular version of extensible-dimensional calculations, and to understand whether ghc-7.6.1 is capable of it. http://hackage.haskell.org/packages/archive/dimensional/0.10.2/doc/html/Numeric-Units-Dimensional-Extensible.html Some of my attempts: https://github.com/nushio3/dimensional-tf/blob/master/attic/list-02.hs This fails because :==: is not an equality test between a and b, but is a equality test within a (promoted) kind. https://github.com/nushio3/dimensional-tf/blob/master/attic/list-03.hs This fails because type instance declarations are not read from top to bottom. (not like function declarations.) https://github.com/nushio3/dimensional-tf/blob/master/attic/map-03.hs I could define a lookup using class constraints, but when I use it, results in overlapping instances. So, will somebody teach me which of the following is correct? * We can write a type family SameType a b :: Bool * We cannot do that because of theoretical reason (that leads to non-termination etc.) * We cannot write SameType, but there are ways to write functions like 'filter' and 'merge' , over type-level lists, without using SameType. Always grateful to your help, -- Takayuki MURANUSHI The Hakubi Center for Advanced Research, Kyoto University http://www.hakubi.kyoto-u.ac.jp/02_mem/h22/muranushi.html ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Takayuki MURANUSHI The Hakubi Center for Advanced Research, Kyoto University http://www.hakubi.kyoto-u.ac.jp/02_mem/h22/muranushi.html ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Observer pattern in haskell FRP
Not sure, but maybe you can define a Drawable class with a method in converting inner state to something draw func could use, so it would be like this: draw :: Drawable a = a - IO () вторник, 27 ноября 2012 г. пользователь Nathan Hüsken писал: Hey, When writing games in other (imperative) languages, I like to separate the game logic from the rendering. For this I use something similar to the observer pattern. With rendering I mean anything only related to how objects are drawn to the screen. Animation state for example. On my journey of exploring game programming with haskell (and FRP), I wonder what a good way of archiving something similar would be. If the rendering has no internal state, one can just write a function draw :: GameLogicState - IO () But when the rendering of an object has an internal state (e.g. animation frame) than this is not possible. Now I could write a Wire/Signal (whatever FRP implementation I use) that translates to a RenderingState: render :: Signal GameLogicState RenderingState draw :: RenderingState - IO () which is fine, except when my game is made of many objects. Than I need to associate the state of one object in GameLogicState with a sub-signal in render. That could be done by giving every object an ID and letting GameLogicState contain a map from IDs to ObjectLogicState. I fear that when I really have a lot of objects, assembling and decomposing the map could become a major bottleneck. So I am wondering: Is there (or can someone think of) a different pattern by which this could be archived? Or asked different: How would you do it? Thanks! Nathan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org javascript:; http://www.haskell.org/mailman/listinfo/haskell-cafe -- Best Timur DeTeam Amirov Moscow, Russia ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Can a GC delay TCP connection formation?
Hello, I've run into an issue that makes me think that when the GHC GC runs while a Snap or Warp HTTP server is serving connections, the GC prevents or delays TCP connections from forming. My application requires that TCP connections form within a few tens of milliseconds. I'm wondering if anyone else has run into this issue, and if there are some GC flags that could help. I've tried a few, such as -H and -c, and haven't found anything to help. I'm using GHC 7.4.1. Thanks, Jeff ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] cabal configure cabal build cabal install
On Mon, 26 Nov 2012 18:21:33 -0500 Albert Y. C. Lai tre...@vex.net wrote: Lastly, there is no Setup install. Use copy and register. $ runghc Setup.hs --help This Setup program uses the Haskell Cabal Infrastructure. See http://www.haskell.org/cabal/ for more information. Usage: Setup.hs COMMAND [FLAGS] or: Setup.hs [GLOBAL FLAGS] Global flags: -h --helpShow this help text -V --version Print version information --numeric-version Print just the version number Commands: configure Prepare to build the package. build Make this package ready for installation. install Copy the files into the install locations. Run register. copy Copy the files into the install locations. haddock Generate Haddock HTML documentation. clean Clean up after a build. sdist Generate a source distribution file (.tar.gz). hscolour Generate HsColour colourised code, in HTML format. register Register this package with the compiler. unregisterUnregister this package with the compiler. test Run the test suite, if any (configure with UserHooks). bench Run the benchmark, if any (configure with UserHooks). help Help about commands For more information about a command use Setup.hs COMMAND --help Typical steps for installing Cabal packages: Setup.hs configure Setup.hs build Setup.hs install On Mon, 26 Nov 2012 18:21:33 -0500 Albert Y. C. Lai tre...@vex.net wrote: cabal configure cabal build cabal register --inplace (newer) cabal build registers inplace automatically. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Can a GC delay TCP connection formation?
Jeff Shaw shawj...@gmail.com wrote: I've run into an issue that makes me think that when the GHC GC runs while a Snap or Warp HTTP server is serving connections, the GC prevents or delays TCP connections from forming. My application requires that TCP connections form within a few tens of milliseconds. I'm wondering if anyone else has run into this issue, and if there are some GC flags that could help. I've tried a few, such as -H and -c, and haven't found anything to help. I'm using GHC 7.4.1. When you compile with -threaded and run on multiple threads, then the runtime uses parallel GC. Did you try that? Greets, Ertugrul -- Not to be or to be and (not to be or to be and (not to be or to be and (not to be or to be and ... that is the list monad. signature.asc Description: PGP signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] cabal configure cabal build cabal install
On 12-11-27 01:02 AM, kudah wrote: On Mon, 26 Nov 2012 18:21:33 -0500 Albert Y. C. Lai tre...@vex.net wrote: Lastly, there is no Setup install. Use copy and register. $ runghc Setup.hs --help [...] install Copy the files into the install locations. Run register. copy Copy the files into the install locations. I stand corrected, thank you. But then to complete answering a previous question, Setup install does not configure, does not build, and is far from cabal install. (newer) cabal build registers inplace automatically. I see where you heard this, but it is a misrepresentation from cabal, and older cabal has always told a similar misrepresentation. When cabal build succeeds, it always says: (older) registering name-version (newer) In-place registering name-version That's what it says. But use ghc-pkg and other tests to verify that no registration whatsoever has happened. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
