[Haskell-cafe] ANN: wizards-1.0: A High level, generic library for interrogative user interfaces
Hi all, wizards is an Haskell library designed for the quick and painless development of interrogative programs, which revolve around a dialogue with the user, who is asked a series of questions in a sequence much like an installation wizard. Everything from interactive system scripts, to installation wizards, to full-blown shells can be implemented with the support of wizards. It is developed transparently on top of a free monad (see Swierstra's excellent paper on this topic at http://www.cs.ru.nl/~W.Swierstra/Publications/DataTypesALaCarte.pdf), which separates out the semantics of the program from the wizards interface. A variety of backends exist, including a full featured backend for Haskeline, a debug-friendly simpler implementation in terms of System.IO primitives, and a completely pure implementation modelled as a function from an input string to output. It is also possible to write your own backends, or extend the existing back-ends with new features. While both built-in IO backends operate on a console, there is no reason why wizards cannot also be used for making GUI wizard interfaces. The library is highly extensible - back-ends can be written or extended with the type system helpfully tracking what features are supported by which back-ends. Installation instructions and some educational examples are at the github page: https://github.com/liamoc/wizards Information on how to write backends or extend backends, as well as structured API documentation is available on Hackage: http://hackage.haskell.org/package/wizards (Or, you can just run cabal haddock to generate the documentation from the source). Regards, Liam O'Connor ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: wizards-1.0: A High level, generic library for interrogative user interfaces
Hello, This library looks very nice. Thank you for realeasing it! I realise it took quite an effort to write it. Looking from examples on Github I noticed that you use -XOverlappingInstances. Why do you need such extension? Best regards, Krzysztof Skrzętnicki On Sun, Jul 1, 2012 at 10:17 AM, Liam O'Connor lia...@cse.unsw.edu.auwrote: Hi all, wizards is an Haskell library designed for the quick and painless development of interrogative programs, which revolve around a dialogue with the user, who is asked a series of questions in a sequence much like an installation wizard. Everything from interactive system scripts, to installation wizards, to full-blown shells can be implemented with the support of wizards. It is developed transparently on top of a free monad (see Swierstra's excellent paper on this topic at http://www.cs.ru.nl/~W.Swierstra/Publications/DataTypesALaCarte.pdf), which separates out the semantics of the program from the wizards interface. A variety of backends exist, including a full featured backend for Haskeline, a debug-friendly simpler implementation in terms of System.IO primitives, and a completely pure implementation modelled as a function from an input string to output. It is also possible to write your own backends, or extend the existing back-ends with new features. While both built-in IO backends operate on a console, there is no reason why wizards cannot also be used for making GUI wizard interfaces. The library is highly extensible - back-ends can be written or extended with the type system helpfully tracking what features are supported by which back-ends. Installation instructions and some educational examples are at the github page: https://github.com/liamoc/wizards Information on how to write backends or extend backends, as well as structured API documentation is available on Hackage: http://hackage.haskell.org/package/wizards (Or, you can just run cabal haddock to generate the documentation from the source). Regards, Liam O'Connor ___ 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] ANN: wizards-1.0: A High level, generic library for interrogative user interfaces
I know it's somewhat evil (:P), but I was unable to implement the subsumption constraints (::) in a way that avoided it. It's there because I'm (ab)using the type-class system to do computation (specifically an O(n) search though long chain of coproducts for a specific constructor). E.g, determining Foo :: Bar :+: Foo :+: Baz. There may be a way to rearrange the type level stuff to make it go away, perhaps with some new type extensions in 7.4 that I haven't studied extensively yet. This is also a problem in Swierstra's original paper where he introduces this technique. In practice, it doesn't pose a problem, because you're not meant to define your own instances of :: anyway, and you shouldn't care what order the constructors occur. Regards, Liam O'Connor On Sunday, 1 July 2012 at 6:37 PM, Krzysztof Skrzętnicki wrote: Hello, This library looks very nice. Thank you for realeasing it! I realise it took quite an effort to write it. Looking from examples on Github I noticed that you use -XOverlappingInstances. Why do you need such extension? Best regards, Krzysztof Skrzętnicki On Sun, Jul 1, 2012 at 10:17 AM, Liam O'Connor lia...@cse.unsw.edu.au (mailto:lia...@cse.unsw.edu.au) wrote: Hi all, wizards is an Haskell library designed for the quick and painless development of interrogative programs, which revolve around a dialogue with the user, who is asked a series of questions in a sequence much like an installation wizard. Everything from interactive system scripts, to installation wizards, to full-blown shells can be implemented with the support of wizards. It is developed transparently on top of a free monad (see Swierstra's excellent paper on this topic at http://www.cs.ru.nl/~W.Swierstra/Publications/DataTypesALaCarte.pdf (http://www.cs.ru.nl/%7EW.Swierstra/Publications/DataTypesALaCarte.pdf)), which separates out the semantics of the program from the wizards interface. A variety of backends exist, including a full featured backend for Haskeline, a debug-friendly simpler implementation in terms of System.IO primitives, and a completely pure implementation modelled as a function from an input string to output. It is also possible to write your own backends, or extend the existing back-ends with new features. While both built-in IO backends operate on a console, there is no reason why wizards cannot also be used for making GUI wizard interfaces. The library is highly extensible - back-ends can be written or extended with the type system helpfully tracking what features are supported by which back-ends. Installation instructions and some educational examples are at the github page: https://github.com/liamoc/wizards Information on how to write backends or extend backends, as well as structured API documentation is available on Hackage: http://hackage.haskell.org/package/wizards (Or, you can just run cabal haddock to generate the documentation from the source). Regards, Liam O'Connor ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto: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] ANN: wizards-1.0: A High level, generic library for interrogative user interfaces
You have implemented very general idea as a part of your library (Data type a la carte). Maybe it's better to make a separate package? Other developers would benefit from it. I saw some other packages and they implement it too. Anton 2012/7/1 Liam O'Connor lia...@cse.unsw.edu.au I know it's somewhat evil (:P), but I was unable to implement the subsumption constraints (::) in a way that avoided it. It's there because I'm (ab)using the type-class system to do computation (specifically an O(n) search though long chain of coproducts for a specific constructor). E.g, determining Foo :: Bar :+: Foo :+: Baz. There may be a way to rearrange the type level stuff to make it go away, perhaps with some new type extensions in 7.4 that I haven't studied extensively yet. This is also a problem in Swierstra's original paper where he introduces this technique. In practice, it doesn't pose a problem, because you're not meant to define your own instances of :: anyway, and you shouldn't care what order the constructors occur. Regards, Liam O'Connor On Sunday, 1 July 2012 at 6:37 PM, Krzysztof Skrzętnicki wrote: Hello, This library looks very nice. Thank you for realeasing it! I realise it took quite an effort to write it. Looking from examples on Github I noticed that you use -XOverlappingInstances. Why do you need such extension? Best regards, Krzysztof Skrzętnicki On Sun, Jul 1, 2012 at 10:17 AM, Liam O'Connor lia...@cse.unsw.edu.au(mailto: lia...@cse.unsw.edu.au) wrote: Hi all, wizards is an Haskell library designed for the quick and painless development of interrogative programs, which revolve around a dialogue with the user, who is asked a series of questions in a sequence much like an installation wizard. Everything from interactive system scripts, to installation wizards, to full-blown shells can be implemented with the support of wizards. It is developed transparently on top of a free monad (see Swierstra's excellent paper on this topic at http://www.cs.ru.nl/~W.Swierstra/Publications/DataTypesALaCarte.pdf ( http://www.cs.ru.nl/%7EW.Swierstra/Publications/DataTypesALaCarte.pdf)http://www.cs.ru.nl/%7EW.Swierstra/Publications/DataTypesALaCarte.pdf%29), which separates out the semantics of the program from the wizards interface. A variety of backends exist, including a full featured backend for Haskeline, a debug-friendly simpler implementation in terms of System.IO primitives, and a completely pure implementation modelled as a function from an input string to output. It is also possible to write your own backends, or extend the existing back-ends with new features. While both built-in IO backends operate on a console, there is no reason why wizards cannot also be used for making GUI wizard interfaces. The library is highly extensible - back-ends can be written or extended with the type system helpfully tracking what features are supported by which back-ends. Installation instructions and some educational examples are at the github page: https://github.com/liamoc/wizards Information on how to write backends or extend backends, as well as structured API documentation is available on Hackage: http://hackage.haskell.org/package/wizards (Or, you can just run cabal haddock to generate the documentation from the source). Regards, Liam O'Connor ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto: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] package to expand TH macros?
I seem to remember finding a package a few days ago that would take Haskell source with TH, then run and expand the TH macros in-place to produce equivalent, TH-free Haskell source. I just went through the Hackage package list and didn't find anything like that. Did I imagine it? Or can anyone remind me its name? thanks, --Eric___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] package to expand TH macros?
On Sun, Jul 1, 2012 at 1:56 PM, Eric devnull1...@yahoo.com wrote: I seem to remember finding a package a few days ago that would take Haskell source with TH, then run and expand the TH macros in-place to produce equivalent, TH-free Haskell source. It is kinda hard to find for some reason... you're looking for ZeroTH, http://hackage.haskell.org/package/zeroth -- brandon s allbery allber...@gmail.com wandering unix systems administrator (available) (412) 475-9364 vm/sms ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] package to expand TH macros?
On Sun, Jul 1, 2012 at 8:11 PM, Brandon Allbery allber...@gmail.com wrote: On Sun, Jul 1, 2012 at 1:56 PM, Eric devnull1...@yahoo.com wrote: I seem to remember finding a package a few days ago that would take Haskell source with TH, then run and expand the TH macros in-place to produce equivalent, TH-free Haskell source. It is kinda hard to find for some reason... you're looking for ZeroTH, http://hackage.haskell.org/package/zeroth It should probably at least have the Template Haskell category... -- Jedaï ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] how to check thunk
Hello, Are there any ways to see if a value is a thunk or memorized? I would like to have a function like: isThunk :: a - IO Bool I'm implementing some data structures described in Purely Functional Data Structures and want to check my implementation is correct. E.g. https://gist.github.com/2987425 Thanks. --Kazu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] how to check thunk
On Mon, Jul 2, 2012 at 5:29 AM, Kazu Yamamoto k...@iij.ad.jp wrote: Hello, Are there any ways to see if a value is a thunk or memorized? I would like to have a function like: isThunk :: a - IO Bool vacuum allow that and much more though I don't know if it still works correctly on GHC 7.4. Anyway your isThunk is isThunk a = fmap GHC.Vacuum.ClosureType.isThunk GHC.Vacuum.closureType (Feel free to arrange your imports to make that a bit more readable ;) http://hackage.haskell.org/package/vacuum -- Jedaï ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] how to check thunk
Hello, vacuum allow that and much more though I don't know if it still works correctly on GHC 7.4. Anyway your isThunk is isThunk a = fmap GHC.Vacuum.ClosureType.isThunk GHC.Vacuum.closureType Great. I confirmed that this works with GHC 7.4. # I removed the a parameter. Thank you very much! --Kazu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
