Re: [Haskell-cafe] Darcs users [was: New book: Real-World Haskell!]
I didn't say there weren't others, simply that I didn't know of any others (I don't just go looking for things online all the time...having a real job really gets in the way of these things)! So I wasn't really trying to disparage darcs. But here's another statistic: http://www.google.com/search?rls=enq=darcs+inurl:_darcsie=UTF-8oe=UTF-8 Results 1 - 50 of about 54,100 for darcs inurl:_darcs. (0.38 seconds) http://www.google.com/search?rls=enq=svn+inurl:svnie=UTF-8oe=UTF-8 Results 1 - 50 of about 995,000 for svn inurl:svn. (0.14 seconds) That's 54,000 pages vs. 995,000 pages. That really was more my point. (BTW, cvs is still [Results 1 - 50 of about 2,920,000 for cvs inurl:cvs. (0.17 seconds)]) I *want* people (and companies) to move to Haskell; therefore, I want to lower the entry price. The goal is to introduce a new language, not a new SCM tool. You certainly wouldn't want to leave the impression that one MUST use darcs in order to use Haskell! On 5/26/07, Donald Bruce Stewart [EMAIL PROTECTED] wrote: On 26/05/07, Matthew Sackman [EMAIL PROTECTED] wrote: (On the other hand, I don't know of anyone outside immediate haskellers using Darcs.) Good idea to get some data on this, instead of speculating. Let's do that. A quick google reveals the Haskell crew is far from alone as users. http://www.google.com.au/search?hl=enq=_darcs Here's the first 20 hits google finds: repo.nitroproject.org/_darcs/ darcs.pugscode.org/_darcs/ common-lisp.net/project/cffi/darcs/cffi/_darcs/ www.cymraeg.ru/repos/geiriadur/_darcs/current/ www.cse.unsw.edu.au/~dons/code/polymer/_darcs/ -- Haskell www.cse.unsw.edu.au/~dons/code/goa/_darcs/ -- Haskell zargon.hobbesnet.org/~squires/repos/torbutton/_darcs/ facets.rubyforge.org/src/_darcs/ www.n-heptane.com/nhlab/repos/cabalDebianTemplate/_darcs/ www.khjk.org/~sm/code/advopost/_darcs/ repetae.net/john/repos/GetOptions/_darcs/ -- Haskell james.tooraweenah.com/darcs/netrek-server/_darcs/ users.tkk.fi/~ptotterm/darcs/macports/_darcs/ mumble.net/~campbell/darcs/slime48/_darcs/ galinha.ucpel.tche.br/chicken/_darcs/ mp3fs.sourceforge.net/mp3fs/_darcs/ www.scannedinavian.com/~eric/hpaste/_darcs/-- Haskell www.lshift.net/~tonyg/json-scheme/_darcs/ darcs.fh-wedel.de/hxt/_darcs/ -- Haskell Of which only 5/20 are Haskell repos. -- Don ___ 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] New book: Real-World Haskell!
OTOH, I work for companies, and they really value their assets, especially software assets. So they *want* centralized stuff, so they can ensure they have consistent backups (in the U.S.A. there is a lot of regulation under Sarbanes-Oxley that requires this stuff). Right now we're using ClearCase, which I abhor because it's so heavyweight...but it is centralized control. And as for the workflow, svn plugins are built in (as in free beer!) to: -Xcode -Eclipse -TextMate -Mac OS X (via DAV) -HTML browser and for -Windows (if I really MUST use it) via a download/install. So I can usually view, edit, and commit files (or my favorite svn feature, a set of files atomically) from wherever I happen to be working. On 5/29/07, Jules Bean [EMAIL PROTECTED] wrote: Doug Kirk wrote: No offense to the darcs creators, but 1) Only current Haskellers use it; everyone else either uses Subversion or is migrating to it; If that is true, then they have missed the point. DVC is a real win for most workflows. The applicable alternatives to darcs are : bzr, git, mercurial, tla. They have different pros and cons which are discussed at length on various blogs. svn just doesn't make the list; it's not a comparable project, because it's centralised. SVK is more plausible but since it is essentially a hack to implement decentralisation on top of centralisation, it has different design constraints than things designed from the bottom-up as decentralised. Jules ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] New book: Real-World Haskell!
What about a public darcs repository where people can constantly download and review modifications? People could even send patches to the authors (editors?). I realise that everyone wants to eat their own dog food, but really, if you want the code samples to be available to the masses, you'll use Subversion instead of darcs. No offense to the darcs creators, but 1) Only current Haskellers use it; everyone else either uses Subversion or is migrating to it; 2) It's not suitable for medium- to large-scale software development (after 24 hrs+ of importing code for a project underway, still incomplete, I cancelled it and used Subversion, which completed its import in 45 minutes); 3) I can browse a Subversion repository with a web browser instead of having to download code from the repository from the command line (of course command line is still available). Sometimes viewing a version of a code sample online is all that is needed to answer a question, and in that case I prefer to look instead of downloading a file that I have to delete. --doug ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] New book: Real-World Haskell!
Last time I read O'Reilly's policy, it stated that you're free to suggest an animal, but that they have a full-time person that makes the decision on which animal is on the book. However, the bigger issue is that anybody familiar with O'Reillys product lines knows that their Real World series doesn't have any animals at all! On 5/23/07, Dan Weston [EMAIL PROTECTED] wrote: What power animal have you chosen for the cover of your O'Reilly book? Alas, most of the good ones are gone already! Donald Bruce Stewart wrote: Bryan O'Sullivan, Don Stewart and John Goerzen are pleased, and frankly, very excited to announce that were developing a new book for O'Reilly, on practical Haskell programming. The working title is Real-World Haskell. The plan is to cover the major techniques used to write serious, real-world Haskell code, so that programmers can just get to work in the language. By the end of the book readers should be able to write real libraries and applications in Haskell, and be able to: * design data structures * know how to write, and when to use, monads and monad transformers * use Haskells concurrency and parallelism abstractions * be able to write parsers for custom formats in Parsec. * be able to do IO and binary IO of all forms * be able to bind Haskell to foreign functions in C * be able to do database, network and gui programming * know how to do exception and error handling in Haskell * have a good knowledge of the core libraries * be able to use the type system to track and prevent errors * take advantage of tools like QuickCheck, Cabal and Haddock * understand advanced parts of the language, such as GADTs and MPTCs. That is, you should be able to just write Haskell! The existing handful of books about Haskell are all aimed at teaching programming to early undergraduate audiences, so they are ill-suited to people who already know how to code. And while theres a huge body of introductory material available on the web, you have to be both tremendously motivated and skilled to find the good stuff and apply it to your own learning needs. The time has come for the advanced, practical Haskell book. Heres the proposed chapter outline: 1. Why functional programming? Why Haskell? 2. Getting started: compiler, interpreter, values, simple functions, and types 3. Syntax, type system basics, type class basics 4. Write a real library: the rope data structure, cabal, building projects 5. Typeclasses and their use 6. Bringing it all together: file name matching and regular expressions 7. All about I/O 8. I/O case study: a DSL for searching the filesystem 9. Code case study: barcode recognition 10. Testing the Haskell way: QuickCheck 11. Handling binary files and formats 12. Designing and using data structures 13. Monads 14. Monad case study: refactoring the filesystem seacher 15. Monad transformers 16. Using parsec: parsing a bioinformatics format 17. Interfacing with C: the FFI 18. Error handling 19. Haskell for systems programming 20. Talking to databases: Data.Typeable 21. Web client programming: client/server networking 22. GUI programming: gtk2hs 23. Data mining and web applications 24. Basics of concurrent and parallel Haskell 25. Advanced concurrent and parallel programming 26. Concurrency case study: a lockless database with STM 27. Performance and efficiency: profiling 28. Advanced Haskell: MPTCs, TH, strong typing, GADTs 29. Appendices We're seeking technical reviewers from both inside and outside the Haskell community, to help review and improve the content, with the intent that this text will become the standard reference for those seeking to learn serious Haskell. If you'd like to be a reviewer, please drop us a line at [EMAIL PROTECTED], and let us know a little about your background and areas of interest. Finally, a very exciting aspect of this project is that O'Reilly has agreed to publish chapters online, under a Creative Commons License! Well be publishing chapters incrementally, and seeking feedback from our reviewers and readers as we go. You can find more details and updates at the following locations: * The web site, http://www.realworldhaskell.org/blog/welcome/ * The authors, http://www.realworldhaskell.org/blog/about/ * The blog, http://www.realworldhaskell.org/blog/ -- Bryan O'Sullivan, Don Stewart and John Goerzen. ___ 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
Re: [Haskell-cafe] COM and Haskell
I hate to recommend Java to Haskellers, but there is a project named Poi at Apache's Jakarta site[1] that will allow you to (with some Java programming) read, write, and manipulate Excel files directly. You don't have to COM to Excel, you don't even need Excel installed! Nice for producing spreadsheets for download from a web-based app on the fly. It is complete enough to do formatting, formulas, and such, but you can see the ugly internals of the Microsoft file formats bleeding out, or at least that was true 4 years ago. Maybe it would be a nice project to create a Haskell version of Poi. --doug [1] http://jakarta.apache.org/poi/ On 4/19/07, Paul Moore [EMAIL PROTECTED] wrote: On 19/04/07, Marc Weber [EMAIL PROTECTED] wrote: There is only one library: hdirect. But I don't know its status there have been some posts and some authors may have chnaged it. I'd suggest grepping some mailinglist archives (you can find them all on haskell.org) or wait till someone else gives a more helpful reply ;) I tried quite a while ago to build hdirect, and failed. It looked like it didn't quite support the then-current GHC (6.2???) As far as I can tell, the library hasn't been updated since, so I doubt there's much hope. I'd love to be proved wrong... If you application will be only small you'll be faster using VBScript. Or Python or Perl, or (probably, I'm not sure) Ruby. Or likely many others. Sad, but true... Paul. ___ 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] Integrating Haskell into a J2EE environment
You're going to spend alot of time marshalling between Java and Haskell values, and you'll either have to do it via JNI or by using pipes [as in System.exec(haskellprogram param param param)], both of which are ugly for a Java app. Have you looked at Jython and JRuby? Jython is an implementation of a Python interpreter in 100% Java, and JRuby implements a Ruby interpreter in 100% Java. Those might get the job done faster than having to delve into the native layer. (Not to mention learning how to use Haskell in order to implement what you want--not a trivial task in itself!) Take care, --doug On Oct 5, 2004, at 4:33 PM, Bhinderwala, Shoeb wrote: Hi All, I am new to Haskell and this mailing list. We have a system that uses a custom high-level language to express high-level business rules. Expressions in the high-level language get compiled to Java bytecode. We express the grammar using BNF notation as required by the javacc parser tool. This is then converted to an AST using jjtree and from there we build the final Java code. Our language could be considered a domain-specific language (DSL) and is used by our business users to express very high-level business logic. The language currently is very limited - we support boolean logic, function invocations and if-then statements. We want to convert it into a more powerful scripting language so that even lower level business logic can be expressed in it. I came across a few papers that talk about writing a DSL with Haskell as the underlying support language. How is this done. Is it possible to create a sort of domain specific business scripting language easily. How does that then compile to Haskell code. And how can the Haskell code be invoked from Java. Essentially, I am thinking if I could use a Haskell like DSL language to express our business rule logic and then be able to integrate into and invoke the logic from a J2EE app server environment. Has anybody done anything like this with Haskell. -- Shoeb ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe This communication is confidential and may be legally privileged. If you are not the intended recipient, (i) please do not read or disclose to others, (ii) please notify the sender by reply mail, and (iii) please delete this communication from your system. Failure to follow this process may be unlawful. Thank you for your cooperation. ___ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
