Re: [Haskell-cafe] Problem with cabal install zlib
On Fri, 2009-12-18 at 23:01 +, Ozgur Akgun wrote: Hi, When I run cabal install zlib or cabal upgrade zlib I get the following error: Resolving dependencies... Configuring zlib-0.5.2.0... Preprocessing library zlib-0.5.2.0... Only one output file may be specified We'll need more details here. Try running with -v2 or -v3. It should say what command it's running. Duncan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problem with cabal install zlib
Thanks for the feedback. I guess the following part is the problematic part: (But I've no idea how to resolve it) Creating dist/build (and its parents) Creating dist/build/autogen (and its parents) Preprocessing library zlib-0.5.2.0... Creating dist/build/Codec/Compression/Zlib (and its parents) /usr/bin/hsc2hs --cc=/usr/bin/gcc --ld=/usr/bin/gcc --cflag=-D__GLASGOW_HASKELL__=610 --lflag=-lz --cflag=-I/Users/ozgurakgun/.cabal/lib/bytestring-0.9.1.5/ghc-6.10.4/include --cflag=-I/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-4.1.0.0/include --cflag=-I/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/include --lflag=-L/Users/ozgurakgun/.cabal/lib/bytestring-0.9.1.5/ghc-6.10.4 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-3.0.3.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/syb-0.1.0.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-4.1.0.0 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/integer-0.1.0.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/ghc-prim-0.1.0.0 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4 --lflag=-lm --lflag=-lffi --lflag=-lgmp --lflag=-ldl *-o dist/build/Codec/Compression/Zlib/Stream.hs Codec/Compression/Zlib/Stream.hsc* Only one output file may be specified cabal: Error: some packages failed to install: zlib-0.5.2.0 failed during the building phase. The exception was: exit: ExitFailure 1 2009/12/19 Duncan Coutts duncan.cou...@googlemail.com On Fri, 2009-12-18 at 23:01 +, Ozgur Akgun wrote: Hi, When I run cabal install zlib or cabal upgrade zlib I get the following error: Resolving dependencies... Configuring zlib-0.5.2.0... Preprocessing library zlib-0.5.2.0... Only one output file may be specified We'll need more details here. Try running with -v2 or -v3. It should say what command it's running. Duncan -- Ozgur Akgun ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problem with cabal install zlib
I actually ran into this problem last night. Here's my workaround (note that it involves downgrading to zlib-0.5.0.0 1) unregister the zlib-0.5.2.0 package (prompt ghc-pkg unregister zlib-0.5.2.0) 2) rebuild and install cabal-install: prompt tar -zxvf ~/.cabal/packages/hackage.haskell.org/cabal-install/0.6.4/cabal-install-0.6.4.tar.gz prompt cd cabal-install-0.6.4 prompt runghc Setup.hs configure --user runghc Setup.hs build runghc Setup.hs install Note that this requires that you still have zlib-0.5.0.0 installed. Also your paths and options for configuring may vary. But, this worked for me. Max On Dec 19, 2009, at 5:39 PM, Ozgur Akgun wrote: Thanks for the feedback. I guess the following part is the problematic part: (But I've no idea how to resolve it) Creating dist/build (and its parents) Creating dist/build/autogen (and its parents) Preprocessing library zlib-0.5.2.0... Creating dist/build/Codec/Compression/Zlib (and its parents) /usr/bin/hsc2hs --cc=/usr/bin/gcc --ld=/usr/bin/gcc --cflag=-D__GLASGOW_HASKELL__=610 --lflag=-lz --cflag=-I/Users/ozgurakgun/.cabal/lib/bytestring-0.9.1.5/ghc-6.10.4/include --cflag=-I/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-4.1.0.0/include --cflag=-I/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/include --lflag=-L/Users/ozgurakgun/.cabal/lib/bytestring-0.9.1.5/ghc-6.10.4 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-3.0.3.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/syb-0.1.0.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/base-4.1.0.0 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/integer-0.1.0.1 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4/ghc-prim-0.1.0.0 --lflag=-L/Library/Frameworks/GHC.framework/Versions/610/usr/lib/ghc-6.10.4 --lflag=-lm --lflag=-lffi --lflag=-lgmp --lflag=-ldl -o dist/build/Codec/Compression/Zlib/Stream.hs Codec/Compression/Zlib/Stream.hsc Only one output file may be specified cabal: Error: some packages failed to install: zlib-0.5.2.0 failed during the building phase. The exception was: exit: ExitFailure 1 2009/12/19 Duncan Coutts duncan.cou...@googlemail.com On Fri, 2009-12-18 at 23:01 +, Ozgur Akgun wrote: Hi, When I run cabal install zlib or cabal upgrade zlib I get the following error: Resolving dependencies... Configuring zlib-0.5.2.0... Preprocessing library zlib-0.5.2.0... Only one output file may be specified We'll need more details here. Try running with -v2 or -v3. It should say what command it's running. Duncan -- Ozgur Akgun ___ 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] Re: Pattern matching, and bugs
From: Felipe Lessa felipe.le...@gmail.com On Fri, Dec 18, 2009 at 02:13:02PM +, John Lato wrote: So now the program needs a result of some type (String in your example) and gets an undefined, and then immediately crashes with an Exception - undefined error. I think this is the second time this is said in this thread, but please don't as it may confuse the OP. undefineds, including those generated by missing cases, do *not* crash the program. They also do not *immediately* close the program. They are propagated as exceptions are, however most of the time we write programs without explicitly catching them. Of course you're correct. I was careful to note that undefined's generate exceptions, but left out the rest on the assumption that the OP would be familiar with exception handling and propagation. But it is best to be perfectly explicit. So the proper wording would be that the undefineds propagate through the functions and whenever they reach the top function (i.e. main), they are caught by the runtime system, which prints the String associated with the undefined and exits the proccess with an error code. I should note also that *pure* code *can't* catch those undefineds. If they could, then Nasty Things Would Happen(TM) and we don't want that. However IO code may catch them without any problem using Control.Exception's functions. I agree this is an important point, particularly as it's different from declarative/OOP exception mechanisms. John ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] How to use Control.Failure?
I have looked at the recently released Control.Failure library but I admit, I couldn't understand it completely. So given the example below, how would Control.Failure help me here? Thanks, nt -- Theirs (other library code stubs) data TheirError = TheirErrorCase deriving Show data TheirData = TheirData deriving Show theirFunc :: [String] - Either TheirError TheirData theirFunc = undefined -- Mine (my own code stubs) data MyError = MyErrorCase deriving Show data MyData = MyData deriving Show myFuncA :: TheirData - Either MyError MyData myFuncA = undefined -- Ugly. How to apply Control.Failure here? myFuncB :: IO (Either MyError MyData) myFuncB = do let x = theirFunc [] case x of Right x' - return $ myFuncA x' Left _ - return . Left $ MyErrorCase ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Haskell Weekly News: Issue 144 - December 19, 2009
--- Haskell Weekly News http://sequence.complete.org/hwn/20091219 Issue 144 - December 19, 2009 --- Welcome to issue 144 of HWN, a newsletter covering developments in the [1]Haskell community. The big news this week is the release of the Glorious Glasgow Haskell compiler version 6.12.1, lots of exciting new improvements, congratulations from the whole community go out to the devs, good work GHC Team! Otherwise, this week has been quiet, with some interesting discussions about associated types and the new GHC, and some excellent new packages announced. Finally, due to the incoming holidays, there won't be an HWN for the next two weeks, I'll see you Haskellers in 2010, until then, your Haskell Weekly News! Announcements GHC version 6.12.1. Ian Lynagh [2]announced the (Interactive) Glasgow Haskell Compiler, version 6.12.1. Including improved support for parallel execution, Dynamic linking support on Linux, and many other improvments. atom-0.1.4. Tom Hawkins [3]announced a bug fix release of the atom package, affecting floating point variable initialization. text 0.7, fast Unicode text. Bryan O'Sullivan [4]announced a new release of the text package adds support for Unicode I/O explicit-iomodes-0.1. Bas van Dijk [5]announced explicit-iomodes version 0.1, a wrapper around System.IO that provides a Handle type which is parametrized with the IOMode it is in. Hemkay, the 100% Haskell MOD player. Patai Gergely [6]announced a Hemkay, an old-school MOD player in pure Haskell. GT-VMT 2010: deadlines extended. Emilio Tuosto [7]announced a deadline extension to the GT-VMT call for papers. Discussion Restrictions on associated types for classes. Stephen Lavelle [8]asked if there was a way to wrap a associated type in a class constraint. Yay 6.12.1! Evan Laforge [9]talked about some of the changes in the new version of GHC. Blog noise [10]Haskell news from the [11]blogosphere. Blog posts from people new to the Haskell community are marked with , be sure to welcome them! * Michael Snoyman: [12]data-object family. * Bryan O'Sullivan: [13]Making GHC's I/O manager more scalable. * Conor McBride: [14]Epilogue for Epigram: 2+2=4. * Sebastian Fischer: [15]Thesis submitted. * Bryan O'Sullivan: [16]Data.Text 0.7 gains I/O support. * Ketil Malde: [17]Searching for poly(A) tails. * Mark Jason Dominus: [18]Monads are like burritos. * Sean Leather: [19]Upwards and downwards accumulations on trees translated into Haskell. Quotes of the Week * yrlnry: byorgey yrlnry: just some lady who had a lot of money and decided she wanted poor grad students to have some of it after she died... pretty nice of her, actually yrlnry senile dementia, more likely. * Philonous: A 'newbie', in Haskell, is someone who hasn't yet implemented a compiler. They've only written a monad tutorial. * kmc: Right, for example Either (pun not intended) * kmc: One thing I've learned from open-source software is that if you invent enough wheels, one of them will turn out to be round and capable of rolling. * PhilipWadler: To see that in and out are inverses, stare at the following diagram * kmc: Data.Map is like a C++ STL mapk,v, without the suck * edwardkmett: Most monad tutorials are written by people who barely understand monads, if at all, but unfortunately nothing can stop someone from writing a monad tutorial. We've tried, there was blood everywhere. * Cale: A small category is a monad in the 2-category of spans of sets. About the Haskell Weekly News New editions are posted to [20]the Haskell mailing list as well as to [21]the Haskell Sequence and [22]Planet Haskell. [23]RSS is also available, and headlines appear on [24]haskell.org. To help create new editions of this newsletter, please see the information on [25]how to contribute. Send stories to jfredett . at . gmail . dot . com. The darcs repository is available at darcs get [26]http://patch-tag.com/r/jfredett/HWN2/pullrepo HWN2 . References 1. http://haskell.org/ 2. http://article.gmane.org/gmane.comp.lang.haskell.general/17678 3. http://article.gmane.org/gmane.comp.lang.haskell.cafe/68009 4. http://article.gmane.org/gmane.comp.lang.haskell.cafe/67946 5. http://article.gmane.org/gmane.comp.lang.haskell.cafe/67931 6. http://article.gmane.org/gmane.comp.lang.haskell.cafe/67923 7. http://article.gmane.org/gmane.comp.lang.haskell.general/17676 8. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/68084 9. http://thread.gmane.org/gmane.comp.lang.haskell.cafe/67950 10. http://planet.haskell.org/ 11. http://haskell.org/haskellwiki/Blog_articles
Re: [Haskell-cafe] How to use Control.Failure?
On Sat, Dec 19, 2009 at 4:46 PM, ntupel ntu...@googlemail.com wrote:
I have looked at the recently released Control.Failure library but I
admit, I couldn't understand it completely. So given the example
below, how would Control.Failure help me here?
Thanks,
nt
-- Theirs (other library code stubs)
data TheirError = TheirErrorCase deriving Show
data TheirData = TheirData deriving Show
theirFunc :: [String] - Either TheirError TheirData
theirFunc = undefined
-- Mine (my own code stubs)
data MyError = MyErrorCase deriving Show
data MyData = MyData deriving Show
myFuncA :: TheirData - Either MyError MyData
myFuncA = undefined
-- Ugly. How to apply Control.Failure here?
myFuncB :: IO (Either MyError MyData)
myFuncB = do
let x = theirFunc []
case x of
Right x' - return $ myFuncA x'
Left _ - return . Left $ MyErrorCase
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Well, here's one way of doing it. You have lots of choices here; these are
the decisions I made in implementing the code:
* myFuncB no longer lives in the IO monad. I wasn't sure if you specifically
wanted that, but now it can work with *any* instance of Failure.
* Since I assumed you ultimately wanted it to land in the IO monad, I
defined Exception instances. However, if you were dealing with a different
Failure instance (like [] or Maybe), these would be unncesary.
* I also assume that what you meant by your code and their code is that
you can modify your own code, but not theirs.
If you show me what the real code is you're working on, I'd be happy to more
fully develop a better solution with you. Anyway, here's the code.
Michael
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE StandaloneDeriving #-}
import Control.Failure
import Data.Typeable (Typeable)
import Control.Exception (Exception)
-- Theirs (other library code stubs)
data TheirError = TheirErrorCase deriving Show
data TheirData = TheirData deriving Show
theirFunc :: [String] - Either TheirError TheirData
theirFunc = undefined
-- Mine (my own code stubs)
data MyError = MyErrorCase deriving (Show, Typeable)
instance Exception MyError
deriving instance Typeable TheirError
instance Exception TheirError
data MyData = MyData deriving Show
myFuncA :: MonadFailure MyError m = TheirData - m MyData
--myFuncA :: TheirData - Either MyError MyData
myFuncA = undefined
myFuncB :: (MonadFailure MyError m, MonadFailure TheirError m)
= m MyData
myFuncB = do
x - try $ theirFunc []
myFuncA x
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[Haskell-cafe] Re: How to use Control.Failure?
On Dec 19, 5:14 pm, Michael Snoyman mich...@snoyman.com wrote: Well, here's one way of doing it. You have lots of choices here; these are the decisions I made in implementing the code: * myFuncB no longer lives in the IO monad. I wasn't sure if you specifically wanted that, but now it can work with *any* instance of Failure. * Since I assumed you ultimately wanted it to land in the IO monad, I defined Exception instances. However, if you were dealing with a different Failure instance (like [] or Maybe), these would be unncesary. * I also assume that what you meant by your code and their code is that you can modify your own code, but not theirs. If you show me what the real code is you're working on, I'd be happy to more fully develop a better solution with you. Anyway, here's the code. Thank you very much. This helped a lot. I wasn't aware of many of the details you showed me now, such as deriving from Typeable. The assumptions you have made w.r.t to what I want to write all make sense and I guess I can experiment with Control.Failure a little better now. Thanks again, nt ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Pattern matching, and bugs
Ketil Malde wrote:
András Mocsáry amo...@gmail.com writes:
Now we have a problem, which is most generally fixed in these ways:
C-like:
switch ( x )
{
Case 0:
Unchecked
Case 1:
Checked
Case 2:
Unknown
Default:
Nothing
}
This is not a fix, this is a workaround for a design bug, namely that
x is of a type that allows meaningless data.
Indeed. In C-like languages it is common practice to use integers to
mean just about anything. Often there are fewer of anything than there
are integers, and so hacks like this are necessary to work around the
ensuing problems. But ultimately, this is a *type error*.
The proper response, in Haskell, to type errors like this is not to add
hacks catching bad values, but rather to change the types so that bad
values cannot be constructed. As a few others have mentioned, rather
than using an integer, you should define a new type like:
data X = Unchecked | Checked | Unknown
and then require that x is of type X. Thus the pattern-checker can
verify that all possible values of x will match some case option.
The reason Haskell (or other typed functional languages) allow proving
correctness so much easier than other languages is because we create new
types which correctly and precisely match the set of values we want to
belong to that type[1]. By pushing as much of the correctness logic as
possible up into the type layer, this frees us from needing to check
things at the term layer since the type-checker can capture type errors
automatically. But it can't catch things we haven't told it are errors.
[1] For some complex sets of values this isn't possible with Haskell's
type system, which is one of the reasons for the recent interest in
dependently typed languages. However, for most familiar sets of values
(and quite a few unfamiliar ones) Haskell's type system is more than enough.
--
Live well,
~wren
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Re: [Haskell-cafe] sizeOf on a type
Sean Leather wrote: I can see what's going on: it can't tell that the a I am writing there is the same a that's in the type specification, but is there any way that I can make it identify a with the a in the specification for nextPtr? Lexically scoped type variables: http://www.haskell.org/ghc/docs/latest/html/users_guide/other-type-extensions.html#scoped-type-variables And if you require H98+FFI only, you can also use the following: ptrSizeOf = sizeOf . asTypeOf undefined . unsafePerformIO . peek The asTypeOf function is the H98 way of handling many scoped type variable issues. It never evaluates its second argument so the unsafePerformIO is perfectly safe since the peek will never be evaluated either (and, heck, the whole argument to sizeOf won't be evaluated either). -- Live well, ~wren ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN: Happstack 0.4.1
Happstack 0.4.1 STABLE is now available. We recommend that all users of Happstack update to 0.4.1 immediately. Migration from Happstack 0.3 should be trivial. There was one race condition in happstack-state which could cause a state event to fail under heavy congestion. Happstack is the Haskell Application Server Stack. It is a scalable framework for developing web applications. It is similar in purpose to Django, RoR, Turbogears, Grails, Seaside, etc. Using less buzzwords, it is a collection of libraries which can be used to develop a self-contained server application which does not require SQL or Apache (though it can integrate with both). It includes: * an HTTP server * a rich DSL for deconstructing HTTP Requests and generating Responses * HTML/XML/etc templating via HStringTemplate, HSP, or Text.XHtml * a persistent data store based on user defined Haskell data types with ACID properties and state migration * and more!! Happstack's modular nature means it is easy to integrate unrelated 3rd party modules such as Pandoc, or to add support for an alternative templating system. Additionally, it does not exclude you from using SQL, or supporting other protocols besides HTTP. HOMEPAGE: http://www.happstack.com/ SUPPORTED PLATFORMS: Happstack supports GHC 6.8, 6.10, and 6.12, under GNU/Linux, FreeBSD, OS X, and Windows. GHC 6.12 currently requires a minor patch to HJScript. Details here: http://groups.google.com/group/haskell-server-pages/browse_thread/thread/56f388fdbaec1420 INSTALL: 1. ensure that ~/.cabal/bin is in your $PATH 2. cabal update 3. cabal install happstack * see SUPPORTED PLATFORMS for information about GHC 6.12 NOTABLE CHANGES: For a complete list of changes see: http://www.patch-tag.com/r/mae/happstack/snapshots/all/history Removed: * happstack-contrib has been completely removed. If you were using something in it, please complain on the mailing list. * removed Happstack.Server.S3 -- newer, better maintained S3 libraries are on hackage now * removed unsupported spread-based multimaster support fileServe: * now with sendfile() support! On supported platforms sendfile allows files to be served from the disk to the network in a zero-copy fashion. This means faster transfers, less memory and CPU usage, and no file handle leaks. (hopefully). sendfile uses native sendfile() support on Linux, Windows, OS X, and FreeBSD. Other platforms will use a sendfile emulation mode. We recommend that you use sendFile instead of sendFileStrict or sendFileLazy, unless you have specific needs and know some reason why you must use sendFileStrict or sendFileLazy. * FileServe internals majorly refactored. FileServe now provides a modular way of building your own fileServe-like functions. Also includes functions for serving a single file instead of the contents of a directory. * added more complete list of mime-types * automatically redirect from foo to foo/ if foo is a directory * filter . and .. from request path, but allow filenames and directories which start with . happstack-server: * ServerMonad instance for ErrorT * Added ServerMonad, FilterMonad, and WebMonad for XMLGenT * Added secure flag to cookies. Defaults to False. * fix supportsIPv6 to work with newer versions of network library * simpleHTTPWithSocket + bindPort for H.S.SimpleHTTP (you can use this to start the server as root, bind to the socket, and then drop privileges.) * Fixed Accept-Encoding parser to accepts encodings with a - in them. Added additional tests to acceptEncodingParserTest * fix so basicAuth sets correct response code and headers. * SimpleHTTP: added trailingSlash. Guard which checks that Request URI ends with a / * decode body of PUT requests not just POST * added ifModifiedSince guard * added host and withHost guards to SimpleHTTP (similar to dir and path, but for the requested hostname) other: * happstack-state: Correct an embarrassing race condition bug. * happstack-data: Exported getSafeGet and getSafePut * happstack: add state transition code to guestbook (add email to form, handler, and state), and tar of example _local state before transition experimental: * happstack-state: now has experimental replication support using Amazon Web Services. This support is disabled by default. This feature is highly experimental, may not work, and may even be completely removed in future versions (though, hopefully not). THANKS: Alex Jacobson David Himmelstrup / Lemmih Matthew Elder / mae Antoine Latter Erik Hesselink Pasqualino 'Titto' Assini Nils / McManiaC Thomas Hartman Creighton Hogg / wchogg John MacFarlane Jochem Berndsen / koeien MightByte And everyone who filed bug reports, tested RC1 and RC2, and anyone
Re: [Haskell-cafe] Problem with cabal install zlib
On Sat, 2009-12-19 at 09:39 +, Ozgur Akgun wrote: I guess the following part is the problematic part: (But I've no idea how to resolve it) [..] --lflag=-lm --lflag=-lffi --lflag=-lgmp --lflag=-ldl *-o dist/build/Codec/Compression/Zlib/Stream.hs Codec/Compression/Zlib/Stream.hsc* Only one output file may be specified Does that really use the character '*' ? That's pretty weird. Max, are you getting the same? We'll need some help working out where that '*' is coming from. Duncan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: Happstack 0.4.1
GHC 6.12 currently requires a minor patch to HJScript. Details here: HJScript-0.4.5 is now on hackage, fixing this problem. Thanks for the heads-up. Cheers, /Niklas ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Search a directory for files
Hi, I'm trying to make a program to make it easy to rename files in bulk. What I'm wondering is how to get a list of all files in a particular directory. I found System.Posix.Files and I'm planning on using the rename function in it for actually renaming, but I can't find an easy way to get all filenames in a particular directory. Does anyone know how to do it? -Eitan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Search a directory for files
Look in System.Directory; specifically, getDirectoryContents should do what you want. You might also check out the FileManip package, which provides some convenient functionality for finding all files which match a particular pattern. Cheers, Greg On Dec 19, 2009, at 6:40 PM, Eitan Goldshtrom wrote: Hi, I'm trying to make a program to make it easy to rename files in bulk. What I'm wondering is how to get a list of all files in a particular directory. I found System.Posix.Files and I'm planning on using the rename function in it for actually renaming, but I can't find an easy way to get all filenames in a particular directory. Does anyone know how to do it? -Eitan ___ 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] Search a directory for files
Thanks. This looks like exactly what I was looking for. I feel silly for not finding it myself. =P -Eitan Gregory Crosswhite wrote: Look in System.Directory; specifically, getDirectoryContents should do what you want. You might also check out the FileManip package, which provides some convenient functionality for finding all files which match a particular pattern. Cheers, Greg On Dec 19, 2009, at 6:40 PM, Eitan Goldshtrom wrote: Hi, I'm trying to make a program to make it easy to rename files in bulk. What I'm wondering is how to get a list of all files in a particular directory. I found System.Posix.Files and I'm planning on using the rename function in it for actually renaming, but I can't find an easy way to get all filenames in a particular directory. Does anyone know how to do it? -Eitan ___ 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
