Book for Programming Clojure
First the "Programming Clojure" by Stuart Halloway was sad to come April 2009, now i read Juni, so the loong wait have been longer. i know there is a PDF version, but i like to have a book. I am new to both Lisp and Clojure, but not to development. So is there an recommendation regarding books, tutorial etc to get into Clojure, without the book "Programming Clojure". Best regards Anders --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Git with Google Code
Soon, we will be able to use a DVCS on Google Code :) http://google-code-updates.blogspot.com/2009/04/mercurial-support-for-project-hosting.html --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
clojure-contrib build error
Hi All, I'm newcomer to clojure. Downloaded clojure.jar. Decided to go with VimClojure. So I need clojure-contrib. svn co clojure-contrib, and failed to build. svn co clojure, build fine retried building clojure-contrib, went fine. It's fine by me, but I believe that is not really a good user experience to need to build from sources just to start playing around. It might be good to have clojure-contrib released as clojure is released. Cheers, Hubert. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
If you're on Windows, please take a look at Clojure Box: http://clojure.bighugh.com/ It comes with an installer which sets you up with an Emac environment running Clojure + contrib. It's everything you need to get up in running in minutes. This is the path I took when I faced similar difficulties as you. Let me know later if you need help adding in more depedencies like Compojure or DB drivers, as I had to struggle through that a tiny bit. Rob On Thu, Apr 30, 2009 at 12:08 PM, Hubert Iwaniuk wrote: > Hi All, > > I'm newcomer to clojure. > > Downloaded clojure.jar. > Decided to go with VimClojure. > So I need clojure-contrib. > svn co clojure-contrib, and failed to build. > svn co clojure, build fine retried building clojure-contrib, went fine. > > It's fine by me, but I believe that is not really a good user experience to > need to build from sources just to start playing around. > > It might be good to have clojure-contrib released as clojure is released. > > Cheers, > Hubert. > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
Hi Robert, I got it running, only thing I'm saying is that it could be easier to get clojure-contrib. I'm running Linux and use Vim so Clojure Box is not really for me. Thank you, Hubert On Thu, Apr 30, 2009 at 12:54 PM, Robert Campbell wrote: > > If you're on Windows, please take a look at Clojure Box: > > http://clojure.bighugh.com/ > > It comes with an installer which sets you up with an Emac environment > running Clojure + contrib. > > It's everything you need to get up in running in minutes. This is the > path I took when I faced similar difficulties as you. > > Let me know later if you need help adding in more depedencies like > Compojure or DB drivers, as I had to struggle through that a tiny bit. > > Rob > > > > On Thu, Apr 30, 2009 at 12:08 PM, Hubert Iwaniuk > wrote: > > Hi All, > > > > I'm newcomer to clojure. > > > > Downloaded clojure.jar. > > Decided to go with VimClojure. > > So I need clojure-contrib. > > svn co clojure-contrib, and failed to build. > > svn co clojure, build fine retried building clojure-contrib, went fine. > > > > It's fine by me, but I believe that is not really a good user experience > to > > need to build from sources just to start playing around. > > > > It might be good to have clojure-contrib released as clojure is released. > > > > Cheers, > >Hubert. > > > > > > > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
Hi Hubert, Howard Lewis Ship is maintaining a maven2 repository. See http://groups.google.com/group/clojure/browse_thread/thread/ee67ca7f69bc7e82/1ab62dcf4e2b33c9?lnk=gst&q=howard%2Brepository#1ab62dcf4e2b33c9 for details, Regards, -- Laurent 2009/4/30 Hubert Iwaniuk : > Hi Robert, > > I got it running, only thing I'm saying is that it could be easier to get > clojure-contrib. > I'm running Linux and use Vim so Clojure Box is not really for me. > > Thank you, > Hubert > > > On Thu, Apr 30, 2009 at 12:54 PM, Robert Campbell wrote: >> >> If you're on Windows, please take a look at Clojure Box: >> >> http://clojure.bighugh.com/ >> >> It comes with an installer which sets you up with an Emac environment >> running Clojure + contrib. >> >> It's everything you need to get up in running in minutes. This is the >> path I took when I faced similar difficulties as you. >> >> Let me know later if you need help adding in more depedencies like >> Compojure or DB drivers, as I had to struggle through that a tiny bit. >> >> Rob >> >> >> >> On Thu, Apr 30, 2009 at 12:08 PM, Hubert Iwaniuk >> wrote: >> > Hi All, >> > >> > I'm newcomer to clojure. >> > >> > Downloaded clojure.jar. >> > Decided to go with VimClojure. >> > So I need clojure-contrib. >> > svn co clojure-contrib, and failed to build. >> > svn co clojure, build fine retried building clojure-contrib, went fine. >> > >> > It's fine by me, but I believe that is not really a good user experience >> > to >> > need to build from sources just to start playing around. >> > >> > It might be good to have clojure-contrib released as clojure is >> > released. >> > >> > Cheers, >> > Hubert. >> > >> > > >> > >> >> > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
Hi Laurent, Thank you for information. It would be nice if this kind of info would be available as Featured Wiki page. Regards, Hubert. On Thu, Apr 30, 2009 at 2:33 PM, Laurent PETIT wrote: > > Hi Hubert, > > Howard Lewis Ship is maintaining a maven2 repository. See > > http://groups.google.com/group/clojure/browse_thread/thread/ee67ca7f69bc7e82/1ab62dcf4e2b33c9?lnk=gst&q=howard%2Brepository#1ab62dcf4e2b33c9 > for details, > > Regards, > > -- > Laurent > > 2009/4/30 Hubert Iwaniuk : > > Hi Robert, > > > > I got it running, only thing I'm saying is that it could be easier to get > > clojure-contrib. > > I'm running Linux and use Vim so Clojure Box is not really for me. > > > > Thank you, > >Hubert > > > > > > On Thu, Apr 30, 2009 at 12:54 PM, Robert Campbell > wrote: > >> > >> If you're on Windows, please take a look at Clojure Box: > >> > >> http://clojure.bighugh.com/ > >> > >> It comes with an installer which sets you up with an Emac environment > >> running Clojure + contrib. > >> > >> It's everything you need to get up in running in minutes. This is the > >> path I took when I faced similar difficulties as you. > >> > >> Let me know later if you need help adding in more depedencies like > >> Compojure or DB drivers, as I had to struggle through that a tiny bit. > >> > >> Rob > >> > >> > >> > >> On Thu, Apr 30, 2009 at 12:08 PM, Hubert Iwaniuk > >> wrote: > >> > Hi All, > >> > > >> > I'm newcomer to clojure. > >> > > >> > Downloaded clojure.jar. > >> > Decided to go with VimClojure. > >> > So I need clojure-contrib. > >> > svn co clojure-contrib, and failed to build. > >> > svn co clojure, build fine retried building clojure-contrib, went > fine. > >> > > >> > It's fine by me, but I believe that is not really a good user > experience > >> > to > >> > need to build from sources just to start playing around. > >> > > >> > It might be good to have clojure-contrib released as clojure is > >> > released. > >> > > >> > Cheers, > >> >Hubert. > >> > > >> > > > >> > > >> > >> > > > > > > > > > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Metadata for Any Object
On Apr 30, 1:41 am, Laurent PETIT wrote:
> Hi,
>
> 2009/4/30 Stuart Sierra :
>
>
>
> > On Apr 29, 5:58 pm, Stu Hood wrote:
> >> Instead of attaching the metadata directly to the object, what if the
> >> metadata was stored outside the object, in a global map of {object
> >> metadata,
> >> ...}? In order to handle garbage collection, something similar to Java's
> >> WeakHashMap could be used, with the object itself as the key.
>
> > Interesting idea.
>
> > There might be performance penalities, depending on how often metadata
> > is used. Metadata guarantees atomic updates (alter-meta!) so the
> > WeakHashMap might need to be wrapped in a synchronized map, at a
> > further penalty.
>
> I guess this would not be sufficient: WeakHashMap are not side-effect
> free: they mutate every time one of their key is removed :
> "When a key has been discarded its entry is effectively removed from
> the map, so this class behaves somewhat differently than other Map
> implementations."
>
> , making them improper to be used within STM transactions and such.
>
> Regards,
>
> --
> Laurent
>
>
>
> > I've never needed metadata on non-Clojure types. Do you have a use in
> > mind?
>
> > This could be a library, too, sort of like:
>
> > (defn my-meta [object]
> > (if (instance? clojure.lang.IMeta object)
> > (meta object)
> > (*global-metadata* object)))
>
Metadata for arbitrary objects is not a supportable idea.
First off, there is the fundamental question about whether an object
is truly a value type. If it is not, metadata needs special handling,
essentially being a mutable property of the reference type, a la var/
ref/ns/agent/atom metadata.
If it is a value, then with-meta should work, returning a new value
with the metadata. But doing so for arbitrary value objects would
require a protocol for value cloning.
Then, you need to know which operations require metadata propagation.
That's built into the Clojure data structures but can't be retrofitted
to arbitrary types.
Then there are all the subtleties of metadata being associated with a
value but being recorded as associated with the identity of a value
(e.g. you might have two instances of 42 with different metadata) This
runs completely against the grain of Clojure's value-oriented
programming.
Then you get into the concurrency problems of a centralized metadata
lookup table.
Then you have the GC problems of a huge weak map.
Etc etc. It is simply unworkable IMO.
Rich
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Re: clojure-contrib build error
It's not really all that hard. They make it insanely easy to build. However, Clojure is still in the "new" stage. I'm pretty sure that soon enough we are going to need a new way to manage libraries instead of Clojure-contrib. On Apr 30, 5:08 am, Hubert Iwaniuk wrote: > Hi All, > > I'm newcomer to clojure. > > Downloaded clojure.jar. > Decided to go with VimClojure. > So I need clojure-contrib. > svn co clojure-contrib, and failed to build. > svn co clojure, build fine retried building clojure-contrib, went fine. > > It's fine by me, but I believe that is not really a good user experience to > need to build from sources just to start playing around. > > It might be good to have clojure-contrib released as clojure is released. > > Cheers, > Hubert. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Book for Programming Clojure
http://ociweb.com/jnb/jnbMar2009.html On Apr 30, 4:49 am, anderspe wrote: > First the "Programming Clojure" by Stuart Halloway was sad to come > April 2009, now i read > Juni, so the loong wait have been longer. i know there is a PDF > version, but i like to have a > book. > > I am new to both Lisp and Clojure, but not to development. > > So is there an recommendation regarding books, tutorial etc to get > into Clojure, without the > book "Programming Clojure". > > Best regards > Anders --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Git with Google Code
I'm switching to ubuntu tonight anyways. Still pretty upsetting that, mentioning Git sucks on windows starts a round of "Windows sux!". :\ On Apr 29, 3:55 am, dysinger wrote: > Let me abstract that out a little for you :P > > (defn on-windows [x] > (format "%s sucks on windows!" x)) > > On Apr 28, 1:36 pm, Rayne wrote: > > > Git still sucks on windows :\ > > > On Apr 28, 11:04 am, Stuart Sierra > > wrote: > > > > FYI, for those interested in using Git for Clojure sources, here's > > > Google's advice on how to use Git with Google Code: > > > >http://google-opensource.blogspot.com/2008/05/develop-with-git-on-goo... > > > > -SS --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Book for Programming Clojure
Thanks so mutch, this was great. Best regards Anders On 30 Apr, 15:28, Rayne wrote: > http://ociweb.com/jnb/jnbMar2009.html > > On Apr 30, 4:49 am, anderspe wrote: > > > > > First the "Programming Clojure" by Stuart Halloway was sad to come > > April 2009, now i read > > Juni, so the loong wait have been longer. i know there is a PDF > > version, but i like to have a > > book. > > > I am new to both Lisp and Clojure, but not to development. > > > So is there an recommendation regarding books, tutorial etc to get > > into Clojure, without the > > book "Programming Clojure". > > > Best regards > > Anders- Dölj citerad text - > > - Visa citerad text - --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Dropping strings.
Hi, > Any suggestions? You can use (.substring s n), if n is larger than string length it will return a empty string. -- Krešimir Šojat --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
You can try the eclipse plug in for clojure. It is easy to install and provided with its own clojure.jar and clojure-contrib.jar. here is the link: http://code.google.com/p/clojure-dev/ you will need Eclipse though. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: clojure-contrib build error
You can try the eclipse plug in for clojure. It is easy to install and provided with its own clojure.jar and clojure-contrib.jar. here is the link: http://code.google.com/p/clojure-dev/ you will need Eclipse though. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
testing the reader...
Hi all, I'm currently working on a small project to get started with clojure. I can't solve this problem which seem to be related to the reader. So I ran some test against it. -here's the clojure code: (def text1 "testing thread") (def T (proxy [Thread] [] (run [] (println "T thread : (eval (println text1))") ;this works fine so i assume the var text1 is available from the thread (eval (println text1)) (println "T thread : (eval (read-string \"(println text1)\"))") ; this instruction seem to be causing the problem ; Unable to resolve symbol: text1 in this context (eval (read-string "(println text1)")) ))) (println "Main thread : (eval (println text1))") (eval (println text1)) (println "Main thread : (eval (read-string \"(println text1)\"))") (eval (read-string "(println text1)")) (. T start) -and the output: Clojure Main thread : (eval (println text1)) testing thread Main thread : (eval (read-string "(println text1)")) testing thread 1:1 user=> T thread : (eval (println text1)) testing thread T thread : (eval (read-string "(println text1)")) -followed by the stack trace Exception in thread "Thread-1" java.lang.Exception: Unable to resolve symbol: text1 in this context (NO_SOURCE_FILE:0) at clojure.lang.Compiler.analyze(Compiler.java:4330) at clojure.lang.Compiler.analyze(Compiler.java:4276) at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:2761) at clojure.lang.Compiler.analyzeSeq(Compiler.java:4488) at clojure.lang.Compiler.analyze(Compiler.java:4315) at clojure.lang.Compiler.analyze(Compiler.java:4276) at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:3852) at clojure.lang.Compiler$FnMethod.parse(Compiler.java:3687) at clojure.lang.Compiler$FnMethod.access$1100(Compiler.java:3564) at clojure.lang.Compiler$FnExpr.parse(Compiler.java:2953) at clojure.lang.Compiler.analyzeSeq(Compiler.java:4484) at clojure.lang.Compiler.analyze(Compiler.java:4315) at clojure.lang.Compiler.eval(Compiler.java:4520) at clojure.core$eval__3975.invoke(core.clj:1743) at user$fn__88$fn__90.invoke(testReader.clj:8) at clojure.proxy.java.lang.Thread.run(Unknown Source) Caused by: java.lang.Exception: Unable to resolve symbol: text1 in this context at clojure.lang.Compiler.resolveIn(Compiler.java:4671) at clojure.lang.Compiler.resolve(Compiler.java:4617) at clojure.lang.Compiler.analyzeSymbol(Compiler.java:4594) at clojure.lang.Compiler.analyze(Compiler.java:4297) ... 15 more So my question is would it be possible to get access to text1 in the thread using this code (eval (read-string "(println text1)"))? Is the reader really involved in this? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Book for Programming Clojure
Make sure you read the more recently updated version at http://ociweb.com/mark/clojure/article.html. The "jnb" URL listed below has a link to the newest version near the beginning. For a list of the changes that have been made to this article since it was first released, see http://ociweb.com/mark/clojure/. On Thu, Apr 30, 2009 at 8:28 AM, Rayne wrote: > > http://ociweb.com/jnb/jnbMar2009.html > > On Apr 30, 4:49 am, anderspe wrote: >> First the "Programming Clojure" by Stuart Halloway was sad to come >> April 2009, now i read >> Juni, so the loong wait have been longer. i know there is a PDF >> version, but i like to have a >> book. >> >> I am new to both Lisp and Clojure, but not to development. >> >> So is there an recommendation regarding books, tutorial etc to get >> into Clojure, without the >> book "Programming Clojure". >> >> Best regards >> Anders -- R. Mark Volkmann Object Computing, Inc. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: The function of clojure.contrib.accumulators
Okay; thanks for the answer! I understand now. On Apr 29, 11:52 pm, Konrad Hinsen wrote: > On 29.04.2009, at 21:44, samppi wrote: > > > Could someone give me a simple example of when > > clojure.contrib.accumulators is useful? Its use seems to involve > > collections (and numbers) that have the :clojure.contrib.accumulators/ > > accumulator type, and it has some general multimethods for adding and > > combining, but what does it add that conj and concat do not provide? > > contrib.monads/writer-m seems to suggest using accumulators, too... > > My main motivation for writing that library was to have a generic > interface to many kinds of accumulators for use in contrib.monads/ > writer-m. The writer monad is of little use if a specific type of > accumulator is hard-coded into it, as different applications need to > accumulate quite different data items. The same need for a generic > interface exists in other situations. For example, in one of my > applications I have a tree data structure with a generic "accumulate > leaf values" operation that uses the accumulator multimethods. > > In addition to the generic accumulator interface, the accumulator > library contains implementations of non-trivial accumulators such as > counter, min-max, or mean-variance. I use these three a lot for > statistics, with counter for producing histograms. > > Konrad. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Macro newbie: calling another macro
I'm having trouble trying to create a macro that calls domonad with one argument already filled in: (domonad parser-m rest-of-arguments). parser-m is a monad defined in the same namespace. This is what I have right now: (defmacro complex [steps & product-expr] `(domonad ~parser-m ~steps ~product-expr)) It's giving me this kind of error: Exception in thread "main" java.lang.ExceptionInInitializerError (test_parse.clj:0) If I try it without the quotes: (defmacro complex [steps & product-expr] (domonad parser-m steps product-expr)) I get this error: Exception in thread "main" java.lang.UnsupportedOperationException: count not supported on this type: Symbol (fnparse.clj:55) What can I do to get complex to call domonad with parser-m, delegating what arguments it gets to domonad? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Macro newbie: calling another macro
Hi, Am 30.04.2009 um 17:39 schrieb samppi: (defmacro complex [steps & product-expr] `(domonad ~parser-m ~steps ~product-expr)) Just leave out the ~ in front of parser-m. And I'm not sure how you want to handle product-expr. Maybe a @ is also missing here. (defmacro complex [steps & product-expr] `(domonad parser-m ~steps ~...@product-expr)) The difference is the following. Without @: => (macroexpand-1 '(complex [...] foo bar baz)) (domonad parser-m [...] (foo bar baz)) With @: => (macroexpand-1 '(complex [...] foo bar baz)) (domonad parser-m [...] foo bar baz) It's giving me this kind of error: Exception in thread "main" java.lang.ExceptionInInitializerError (test_parse.clj:0) Look at the stacktrace and scroll very far to the end. Normally there is a "Caused by" sentence, which probably is more informative. At least that is my experience. Hope this helps. Sincerely Meikel smime.p7s Description: S/MIME cryptographic signature
Re: Macro newbie: calling another macro
Thanks for the help. The problem was fixed when I both removed the ~ in front of parser-m and changed ~product-expr to ~...@product-expr. Why is it, though, that parser-m should not be unquoted? If it was unquoted, would it not just pass in the value of parser-m at macro- expansion time? On Apr 30, 8:47 am, Meikel Brandmeyer wrote: > Hi, > > Am 30.04.2009 um 17:39 schrieb samppi: > > > (defmacro complex > > [steps & product-expr] > > `(domonad ~parser-m ~steps ~product-expr)) > > Just leave out the ~ in front of parser-m. And > I'm not sure how you want to handle product-expr. > Maybe a @ is also missing here. > > (defmacro complex > [steps & product-expr] > `(domonad parser-m ~steps ~...@product-expr)) > > The difference is the following. Without @: > > => (macroexpand-1 '(complex [...] foo bar baz)) > (domonad parser-m [...] (foo bar baz)) > > With @: > > => (macroexpand-1 '(complex [...] foo bar baz)) > (domonad parser-m [...] foo bar baz) > > > It's giving me this kind of error: > > Exception in thread "main" java.lang.ExceptionInInitializerError > > (test_parse.clj:0) > > Look at the stacktrace and scroll very far to the > end. Normally there is a "Caused by" sentence, > which probably is more informative. At least > that is my experience. > > Hope this helps. > > Sincerely > Meikel > > smime.p7s > 5KViewDownload --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Metadata for Any Object
On Thu, Apr 30, 2009 at 6:01 AM, Rich Hickey wrote: > Then, you need to know which operations require metadata propagation. > That's built into the Clojure data structures but can't be retrofitted > to arbitrary types. Is there a list of which operations propagate metadata? I know I've been surprised a couple of times. In particular, I have had trouble a couple of times where I was using lists and was surprised that the list operations did not propagate metadata. I'd like to better understand the overall plan of which do and do not. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Dropping strings.
> You can use (.substring s n), if n is larger than string length it > will return a empty string. Hum... that's not my experience, I'm at my job right now so I can't double check this. Looking at the javadoc, it appears that if n is larger than the string length it will throw an IndexOutOfBoundsException. That must have been the reason why I've written drop-str in the first place. Thanks - budu --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Metadata for Any Object
On Apr 30, 12:34 pm, Mark Engelberg wrote: > On Thu, Apr 30, 2009 at 6:01 AM, Rich Hickey wrote: > > Then, you need to know which operations require metadata propagation. > > That's built into the Clojure data structures but can't be retrofitted > > to arbitrary types. > > Is there a list of which operations propagate metadata? I know I've > been surprised a couple of times. In particular, I have had trouble a > couple of times where I was using lists and was surprised that the > list operations did not propagate metadata. I'd like to better > understand the overall plan of which do and do not. I don't want to revisit (yet again) the duality of lists as cells and collections, but metadata propagates wherever it can without causing a copy, i.e. you shouldn't be surprised that rest doesn't propagate metadata. However, there isn't a list, and metadata propagation could use an audit. If there's a specific case where you think it should and it doesn't please let me know. Rich --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Macro newbie: calling another macro
On Apr 30, 2009, at 17:39, samppi wrote: > I'm having trouble trying to create a macro that calls domonad with > one argument already filled in: (domonad parser-m rest-of-arguments). > parser-m is a monad defined in the same namespace. This is what I have > right now: > (defmacro complex > [steps & product-expr] > `(domonad ~parser-m ~steps ~product-expr)) Unquote (the tilde) is used to insert the value of an expression into a template. That is fine for ~steps and ~product-expr. But ~parser-m would insert the *value* of parser-m, not the name itself. Try this instead: (defmacro complex [steps & product-expr] `(domonad parser-m ~steps ~product-expr)) Another variant is: (defmacro complex [steps & product-expr] `(domonad ~'parser-m ~steps ~product-expr)) The subtle difference is that ~'parser-m will insert an unqualified symbol into the template, whereas just parser-m will get you a namespace-qualified symbol that results of a namespace lookup of parser-m. In this particular case, you can use either, because the unqualified symbol you get from ~'parser-m will be expanded to a namespace-qualified symbol when the domonad macro is expanded. Konrad. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Metadata for Any Object
On Thu, Apr 30, 2009 at 9:46 AM, Rich Hickey wrote: > However, there isn't a list, and metadata propagation could use an > audit. If there's a specific case where you think it should and it > doesn't please let me know. I think it just took me a while to figure out that cons does not preserve metadata, but conj does. Ditto with rest/pop. I understand why now, but I couldn't predict the behavior without experimentation. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
What's the function that returns the opposite of a predicate?
I know there's a core function that takes a predicate and returns its opposite: (defn mystery [predicate] (fn [x] (not (predicate x I'm having a lot of trouble finding the name of it in the docs, though. Could anyone give me its name? Or does this function not exist in the core? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: What's the function that returns the opposite of a predicate?
I think maybe you want complement: http://clojure.org/api#complement On Thu, Apr 30, 2009 at 1:50 PM, samppi wrote: > > I know there's a core function that takes a predicate and returns its > opposite: > > (defn mystery [predicate] > (fn [x] (not (predicate x > > I'm having a lot of trouble finding the name of it in the docs, > though. Could anyone give me its name? Or does this function not exist > in the core? > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: What's the function that returns the opposite of a predicate?
On Thu, 30 Apr 2009 23:20:14 +0530, samppi wrote: > > I know there's a core function that takes a predicate and returns its > opposite: > > (defn mystery [predicate] > (fn [x] (not (predicate x > > I'm having a lot of trouble finding the name of it in the docs, > though. Could anyone give me its name? Or does this function not exist > in the core? user=> (doc complement) - clojure.core/complement ([f]) Takes a fn f and returns a fn that takes the same arguments as f, has the same effects, if any, and returns the opposite truth value. nil user=> Regards, Parth --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: What's the function that returns the opposite of a predicate?
On Apr 30, 2009, at 1:50 PM, samppi wrote: I know there's a core function that takes a predicate and returns its opposite: (defn mystery [predicate] (fn [x] (not (predicate x I'm having a lot of trouble finding the name of it in the docs, though. Could anyone give me its name? Or does this function not exist in the core? Is this the one you're thinking of? user=> (find-doc "opposite") - clojure.core/complement ([f]) Takes a fn f and returns a fn that takes the same arguments as f, has the same effects, if any, and returns the opposite truth value. nil user=> --Steve smime.p7s Description: S/MIME cryptographic signature
Re: What's the function that returns the opposite of a predicate?
Wonderful. I didn't think of searching for "opposite". Thanks everyone. On Apr 30, 11:25 am, "Stephen C. Gilardi" wrote: > On Apr 30, 2009, at 1:50 PM, samppi wrote: > > > I know there's a core function that takes a predicate and returns its > > opposite: > > > (defn mystery [predicate] > > (fn [x] (not (predicate x > > > I'm having a lot of trouble finding the name of it in the docs, > > though. Could anyone give me its name? Or does this function not exist > > in the core? > > Is this the one you're thinking of? > > user=> (find-doc "opposite") > - > clojure.core/complement > ([f]) > Takes a fn f and returns a fn that takes the same arguments as f, > has the same effects, if any, and returns the opposite truth value. > nil > user=> > > --Steve > > smime.p7s > 3KViewDownload --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Dropping strings.
> Hum... that's not my experience, I'm at my job right now so I can't > double check this. Looking at the javadoc, it appears that if n is > larger than the string length it will throw an > IndexOutOfBoundsException. That must have been the reason why I've > written drop-str in the first place. > You are right, I foolishly tested in only for n == l, sorry about that. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: testing the reader...
On Apr 30, 2009, at 9:43 AM, Julien wrote: -here's the clojure code: (def text1 "testing thread") (def T (proxy [Thread] [] (run [] (println "T thread : (eval (println text1))") (eval (println text1)) (println "T thread : (eval (read-string \"(println text1)\"))") (eval (read-string "(println text1)")) ))) (println "Main thread : (eval (println text1))") (eval (println text1)) (println "Main thread : (eval (read-string \"(println text1)\"))") (eval (read-string "(println text1)")) (. T start) At any given time, within any given thread, the "current namespace" is bound to the var *ns*, a dynamic variable. Every thread has (potentially) an independent value for *ns*. If no call to "bind" has been made since the thread started, *ns* within that thread will be bound to its root binding which is the clojure.core namespace: user=> (.getRoot (var *ns*)) # Within the body of T: - In the first eval, the expression (println text1) was compiled in the main thread while the user namespace was current. text1 was resolved at compile time to become user/text1. The entire expression was resolved like this: user=> `(eval (println text1)) (clojure.core/eval (clojure.core/println user/text1)) and the compiled. When T ran, the current namespace was clojure.core, but the reference to text1 was fully qualified and referenced the intended var in user. Note that in this case "(clojure.core/println user/text1)" ran to completion while it was being evaluated as an argument to eval. What eval actually received was "nil". eval of nil produced nil. - In the second eval, read-string produced a data structure that was passed to eval. eval tried to do its work by compiling the expression and running it. That compilation occurred within thread T where the current namespace was clojure.core. Since clojure.core/text1 doesn't exist, text1 could not be resolved and the compiler threw an exception. You can "fix" the second eval either by changing \"(println text1)\" to \"(println user/text1)\" or by surrounding the body of T with a "binding" call that binds *ns* to user, or binds it to any namespace and then sets it with a call to "(in-ns 'user)". --Steve smime.p7s Description: S/MIME cryptographic signature
Re: Book for Programming Clojure
Hopefully this will give you some leads also: http://en.wikibooks.org/w/index.php?title=Clojure_Programming/Further_Reading Regards, Tim. On Apr 30, 7:49 pm, anderspe wrote: > First the "Programming Clojure" by Stuart Halloway was sad to come > April 2009, now i read > Juni, so the loong wait have been longer. i know there is a PDF > version, but i like to have a > book. > > I am new to both Lisp and Clojure, but not to development. > > So is there an recommendation regarding books, tutorial etc to get > into Clojure, without the > book "Programming Clojure". > > Best regards > Anders --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
