date:20120918

I noticed that cljs.core redefines String.prototype.apply. Being new to 
Clojure, I don't understand what this redefinition does or what it is 
for. But I do know that redefining functions in the JS standard library, 
or defining new ones on standard objects, is something that should be 
done with great care, to avoid breaking other pieces of JavaScript 
running in the same context (e.g. on the same page). (And lest you think 
your JavaScript is sure to be the only JavaScript on your page, bear in 
mind that some browsers make web pages accessible to blind users by 
injecting their own JS into the page.)


I know there are always trade-offs. And perhaps this definition of 
String.prototype.apply is known not to conflict with any other 
JavaScript code. But I would appreciate an explanation of what purpose 
it serves.


Thanks,
Matt



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Why does cljs.core redefine String.prototype.apply?

 I noticed that cljs.core redefines String.prototype.apply. Being new to 
Clojure, I don't understand what this redefinition does or what it is for. 
But I do know that redefining functions in the JS standard library, or 
defining new ones on standard objects, is something that should be done 
with great care, to avoid breaking other pieces of JavaScript running in 
the same context (e.g. on the same page). (And lest you think your 
JavaScript is sure to be the only JavaScript on your page, bear in mind 
that some browsers make web pages accessible to blind users by injecting 
their own JS into the page.) 

I know there are always trade-offs. And perhaps this definition of 
String.prototype.apply is known not to conflict with any other JavaScript 
code. But I would appreciate an explanation of what purpose it serves. 

Thanks, 
Matt 

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Re: Calling Clojurescript code from Clojure

2012-09-18 Thread Frank Siebenlist

I have the same requirement to have a clojurescript-form in my 
clojure-environment that I want to evaluate in the browser…

To make the following code-snippet work, you're supposed to have a browser-repl 
session running, and start a new repl-session on that same JVM from where you 
invoke the following forms to execute either javascript-code or 
clojurescript-forms in the browser.

---
user= (require 'cljs.repl)
nil

user= (require 'cljs.repl.browser)
nil

user= (cljs.repl.browser/browser-eval alert('No Way!'))
{:status :success, :value }

user= (def my-repl-env {:port 9000, :optimizations :simple, :working-dir 
.lein-cljsbuild-repl, :serve-static true, :static-dir [. out/], 
:preloaded-libs []})
#'user/my-repl-env

user= (def my-env {:context :statement :locals {}})
#'user/my-env

user= (#'cljs.repl/eval-and-print my-repl-env my-env '(js/alert Yes Way!))
nil
nil

user= 
---

The public function cljs.repl.browser/browser-eval seems to allow you to send 
javascript code as a string to the browser to execute over the existing 
browser-repl connection.

The private function cljs.repl/eval-and-print will take a clojurescript form, 
compile it to javascript and send it to the browser for execution. The 
my-repl-env and my-env values are artifacts needed that are normally only 
available within the context of the function.

My apology for this hugeugly hack… please see it as a proof of principle.

There may be much more elegant solutions available… I've only scratch the 
surface of understanding how this clojurescript repl works in detail.

-Enjoy, FrankS 


On Sep 17, 2012, at 9:03 PM, Brent Millare brent.mill...@gmail.com wrote:

 And yes by eval I mean compile and run on the target (browser)
 
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Re: ANN Quartzite 1.0 (final)

2012-09-18 Thread Luis Reyes

Hi,

I'm trying to use Quartzite so followed the tutorial but I have a problem 
at executing the -main function.
I already add the dependency of 

[clojurewerkz/quartzite 1.0.1]


user= (-main)
SLF4J: Failed to load class 
org.slf4j.impl.StaticLoggerBinder.#StdScheduler 
org.quartz.impl.StdScheduler@12993463
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further 
details. 

Could you figure what is the problem ? 



 * Ability to define jobs, triggers and schedules using a DSL
  * Scheduling, unscheduling, pausing and resuming jobs and triggers.
  * Querying scheduler for information, convenient predicate functions
  * Ability to register listeners for scheduler events
  * Access to durable scheduler data stores (JDBC databases out of the box, 
 other stores via plugins)
  * Solid documentation (my favorite feature)
 ,

 New in 1.0 final:

  * Documentation updates
  * Stateful jobs support
  * Clojure 1.4 by default
  * Better names for functions that remove triggers

 Full change log is available on GitHub [4].

 Quartzite targets Clojure 1.3+, tested against 3 Clojure versions x 3 JDKs 
 on travis-ci.org, and is released under the Eclipse Public License.

 Learn more in the Getting Started guide [2] and the rest of the docs [1].

 The source is available on GitHub [3]. We also use GitHub to track issues.


 1. http://clojurequartz.info
 2. http://clojurequartz.info/articles/getting_started.html
 3. http://github.com/michaelklishin/quartzite
 4. 
 https://github.com/michaelklishin/quartzite/blob/1.0.x-stable/ChangeLog.md
 -- 
 MK

 http://github.com/michaelklishin
 http://twitter.com/michaelklishin



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Data Structure server (Redis in Clojure)

2012-09-18 Thread Artem Yankov

Hi,

So I really wanted to learn Clojure and get familiar with the functional 
programming. As a side project I decided
to write a simple data structure server similar to Redis. It uses Redis 
protocol and already supports same data structures and main commands.
So any standard redis client can be used to connect to it as well as 
standard redis-benchmark tool.

Eventually I'd want to make it fast, distributed and extensible (so you can 
easily add any data structures you want). But for
now I'm solving very basic problems while learning the language.

https://github.com/yankov/memobot

Code must be very messy and not idiomatic - I never  had experience with 
Lisps nor functional programming before. I kept cleaning it up, but figured 
it'd be better to try to get feedback first. Would be very grateful if you 
guy could point me some obvious weirdness and bad choices in code.

Also some general questions: 

1. *How to achieve good throughput?* I run the same benchmarking tool as 
for redis and for SET command I get ~200 operations per second (for Redis 
it's 30k/sec). To implement a server I used a very simple jboss netty 
example without any tweaking. What would be a bottle neck here?

2. What would be a best way to implement sorted sets (like in Redis)? I 
used sorted maps and sorting them by values which I highly doubt is a 
log(n) operation..

Thanks.

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Re: Data Structure server (Redis in Clojure)

2012-09-18 Thread Moritz Ulrich


Hi!

I don't have the time to look at your code right now, but I have one suggestion:

Artem Yankov writes:

 2. What would be a best way to implement sorted sets (like in Redis)? I 
 used sorted maps and sorting them by values which I highly doubt is a 
 log(n) operation..

`clojure.core/sorted-set' and `clojure.core/sorted-set-by'

http://clojuredocs.org/clojure_core/clojure.core/sorted-set

-- 
Moritz Ulrich


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Re: Why does cljs.core redefine String.prototype.apply?

On Mon, Sep 17, 2012 at 11:26 AM, Matt Campbell mattcampb...@pobox.com wrote:
 I noticed that cljs.core redefines String.prototype.apply. Being new to
 Clojure, I don't understand what this redefinition does or what it is for.
 But I do know that redefining functions in the JS standard library, or
 defining new ones on standard objects, is something that should be done with
 great care, to avoid breaking other pieces of JavaScript running in the same
 context (e.g. on the same page). (And lest you think your JavaScript is sure
 to be the only JavaScript on your page, bear in mind that some browsers make
 web pages accessible to blind users by injecting their own JS into the
 page.)

 I know there are always trade-offs. And perhaps this definition of
 String.prototype.apply is known not to conflict with any other JavaScript
 code. But I would appreciate an explanation of what purpose it serves.

 Thanks,
 Matt

It's a yucky bit of code that needs to be removed. It's there to
support using keywords as functions - in ClojureScript keywords are
just JS Strings.

David

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Re: ANN Quartzite 1.0 (final)

2012-09-18 Thread Softaddicts

Look at this around the middle of the page:

http://www.slf4j.org/codes.html

Quartz is linked to the slf4j api. At runtime this API tries to find an 
implementation
of the static log binder.

It will not prevent your code from running. If you want to get rid of the 
warning and
get logging (which can be nice :), add one of the listed libs in the page above.

Luc

 Hi,
 
 I'm trying to use Quartzite so followed the tutorial but I have a problem 
 at executing the -main function.
 I already add the dependency of 
 
 [clojurewerkz/quartzite 1.0.1]
 
 
 user= (-main)
 SLF4J: Failed to load class 
 org.slf4j.impl.StaticLoggerBinder.#StdScheduler 
 org.quartz.impl.StdScheduler@12993463
 SLF4J: Defaulting to no-operation (NOP) logger implementation
 SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further 
 details. 
 
 Could you figure what is the problem ? 
 
 
 
  * Ability to define jobs, triggers and schedules using a DSL
   * Scheduling, unscheduling, pausing and resuming jobs and triggers.
   * Querying scheduler for information, convenient predicate functions
   * Ability to register listeners for scheduler events
   * Access to durable scheduler data stores (JDBC databases out of the box, 
  other stores via plugins)
   * Solid documentation (my favorite feature)
  ,
 
  New in 1.0 final:
 
   * Documentation updates
   * Stateful jobs support
   * Clojure 1.4 by default
   * Better names for functions that remove triggers
 
  Full change log is available on GitHub [4].
 
  Quartzite targets Clojure 1.3+, tested against 3 Clojure versions x 3 JDKs 
  on travis-ci.org, and is released under the Eclipse Public License.
 
  Learn more in the Getting Started guide [2] and the rest of the docs [1].
 
  The source is available on GitHub [3]. We also use GitHub to track issues.
 
 
  1. http://clojurequartz.info
  2. http://clojurequartz.info/articles/getting_started.html
  3. http://github.com/michaelklishin/quartzite
  4. 
  https://github.com/michaelklishin/quartzite/blob/1.0.x-stable/ChangeLog.md
  -- 
  MK
 
  http://github.com/michaelklishin
  http://twitter.com/michaelklishin
 
 
 
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Re: Request to create new contrib: data.dependency

2012-09-18 Thread Stuart Sierra

It's open source. You can do whatever you want, under the terms of the EPL.
-S

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Re: Why does cljs.core redefine String.prototype.apply?


On 9/18/2012 8:06 AM, David Nolen wrote:

It's a yucky bit of code that needs to be removed. It's there to
support using keywords as functions - in ClojureScript keywords are
just JS Strings.


Is there another way to do the same thing, without a significant 
performance penalty?


Matt



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ClojureScript dead-code elimination

When run in advanced mode, the Google Closure Compiler tries to 
eliminate dead code. This currently doesn't seem to be very effective 
for ClojureScript. A minimal hello-world example currently compiles to 
90 KB in advanced mode. Is this the best that can be done? Is Clojure's 
dynamism an insurmountable obstacle at this point? Or does this area 
just need more work?


Matt



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Re: Why does cljs.core redefine String.prototype.apply?

On Tue, Sep 18, 2012 at 9:27 AM, Matt Campbell mattcampb...@pobox.com wrote:
 On 9/18/2012 8:06 AM, David Nolen wrote:

 It's a yucky bit of code that needs to be removed. It's there to
 support using keywords as functions - in ClojureScript keywords are
 just JS Strings.


 Is there another way to do the same thing, without a significant performance
 penalty?

 Matt

Probably! A simple clean solution could probably deal with the issue
immediately. A more ambitious solution would address the performance
issues that currently exist around keywords as fns.

A patch most welcome.

David

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[ANN] nrepl.el 0.1.4 released

2012-09-18 Thread Tim King

I am happy to announce the release of nrepl.el v0.1.4, an Emacs client for
nREPL.

https://github.com/kingtim/nrepl.el

v0.1.4 is available now on Marmalade, and should also be available on Melpa.
See the github Readme for installation and usage instructions.

Notable additions since our last release:
 - Improvements and simplifications for completion (Tassilo Horn)
 - Fix paredit .. don't make clojure-mode-map parent of
nrepl-interaction-mode-map (Tassilo Horn)
 - Documentation additions and fixes (Ryan Fowler, Nikita Beloglazov,
Bozhidar Batsov, Juha Syrjälä, Philipp Meier)
 - Make completion back-end and error handler configurable (Hugo Duncan)
 - Accept host as well as port on connect (Ken Restivo)
 - Enable nrepl-interaction-mode in clojurescript-mode (Nelson Morris)
 - Emit stdout from interactive evaluations into the repl buffer
 - Various bug fixes:
   - Fixes for ECB interop (Matthew Willson)
   - Namespace qualify tooling calls (Justin Kramer)
   - Eldoc fixes (Jack Moffitt)
   - Fix path quoting in load file for Windows (Philipp Meier)
   - Fix nREPL / Emacs error Unable to resolve symbol: if-let

Many thanks to all the contributors who have reported issues and
submitted pull requests.

Cheers,
Tim

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Re: ClojureScript dead-code elimination

2012-09-18 Thread Moritz Ulrich


Hi,

Matt Campbell writes:

 When run in advanced mode, the Google Closure Compiler tries to 
 eliminate dead code. This currently doesn't seem to be very effective 
 for ClojureScript. A minimal hello-world example currently compiles to 
 90 KB in advanced mode. Is this the best that can be done? Is Clojure's 
 dynamism an insurmountable obstacle at this point? Or does this area 
 just need more work?

 Matt

This is something I'm interested in too.

One solution I can think of is distributing an 'official' precompiled
clojure.core.js file on some CDN. This would enable caching of the
biggest part of the compiled code.

-- 
Moritz Ulrich


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Re: ClojureScript dead-code elimination

On Tue, Sep 18, 2012 at 9:40 AM, Matt Campbell mattcampb...@pobox.com wrote:
 When run in advanced mode, the Google Closure Compiler tries to eliminate
 dead code. This currently doesn't seem to be very effective for
 ClojureScript. A minimal hello-world example currently compiles to 90 KB in
 advanced mode. Is this the best that can be done? Is Clojure's dynamism an
 insurmountable obstacle at this point? Or does this area just need more
 work?

 Matt

Avoid making any assumptions about what advanced compilation can do
based on trivial ClojureScript programs. I've heard of several large
ClojureScript programs that generate 1.2-1.8 *megabytes* of
JavaScript. After advanced compilation and gzipping the applications
are around 40k-50k (http://blog.mezeske.com/?p=552). This is pretty
impressive given that jQuery, which is pretty standard these days,
itself is 32k gzipped.

But yes, we can do better and there are some things in ClojureScript
that seem to prevent some dead code from being eliminated in small
programs. There's an open issue for that though no one has tackled it
yet. Note the dead code issue doesn't have much to do with dynamism -
rather issues with the generated JS such that Closure doesn't seem to
want to remove some unused code.

David

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Re: ClojureScript dead-code elimination


On 9/18/2012 8:57 AM, David Nolen wrote:

I've heard of several large
ClojureScript programs that generate 1.2-1.8 *megabytes* of
JavaScript. After advanced compilation and gzipping the applications
are around 40k-50k (http://blog.mezeske.com/?p=552). This is pretty
impressive given that jQuery, which is pretty standard these days,
itself is 32k gzipped.


That is indeed impressive. I'd say the overhead of ClojureScript in 
small programs is a non-issue then. Sorry for making a fuss about it.


Matt



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Re: Clojure Programming is a great book

2012-09-18 Thread Chas Emerick

On Sep 13, 2012, at 4:40 PM, larry google groups wrote:

 I want to offer a big thanks to Chas Emerick, Brian Carper and Christophe 
 Grand. I just got their book Clojure Programming from Amazon yesterday. 
 Spent the whole night reading it. This is my favorite Clojure book so far. 

Thank you (and anyone else that has said good things about the book) for the 
kind words.  I'm glad that you are enjoying it so far, and I hope it helps you 
along in your Clojure journey. :-)

Cheers,

- Chas

--
http://cemerick.com
[Clojure Programming from O'Reilly](http://www.clojurebook.com)

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mixing clojure source with java class files problem!


Hi all,

I'm having a really ridiculous problem...let's say there is jar on 
clojars with the following structure:


--- top-level (.jar)
  --foo (clojure namespaces)
-a.clj
-b.clj
-c.clj
  --
  --bar (java .class files - no package declaration when compiled)
 --baz
  -d.class
  -g.class
--
  --
project.clj
--

When i require namespaces from foo there is no problem (:require [foo.a 
:as A])...but when I try to import a couple of java class files from 
bar  (:import  [bar.baz d g]) it's not finding them!


I compiled them specifically without package declarations so I can put 
them anywhere...I also tried without the bar.baz prefixing them but it 
doesn't work...


what am I missing? any pointers?

Jim

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Re: mixing clojure source with java class files problem!

On Tue, Sep 18, 2012 at 10:52 AM, Jim - FooBar(); jimpil1...@gmail.com wrote:
 Hi all,

 I'm having a really ridiculous problem...let's say there is jar on clojars
 with the following structure:

 --- top-level (.jar)
   --foo (clojure namespaces)
 -a.clj
 -b.clj
 -c.clj
   --
   --bar (java .class files - no package declaration when compiled)

The package is baked into the .class file format. You can't change it
after the fack by just moving files in the directory structure.

You'll have to use a bytecode editor (such as Jar Jar Links:
http://code.google.com/p/jarjar/) to change the package
after-the-fact.

What are you trying to accomplish by doing this?

--Aaron

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Re: Calling Clojurescript code from Clojure

2012-09-18 Thread Brent Millare

Shantanu,

Quiddity does not fulfill my requirements since I need to control the 
environment from interop such as load-file and interop.

On Tuesday, September 18, 2012 12:03:27 AM UTC-4, Shantanu Kumar wrote:



 On Sep 18, 8:27 am, Brent Millare brent.mill...@gmail.com wrote: 
  I forgot to mention an additional condition, this should work with the 
 browser as an eval environment 

 Quiddity (URL below) may not load an entire file, but you can eval an 
 S-expression by supplying all values: 

 https://github.com/kumarshantanu/quiddity 

 Shantanu 


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Re: Calling Clojurescript code from Clojure

2012-09-18 Thread Brent Millare

Hi Frank,

That is pretty much exactly as I wanted. The only problem is that you are 
calling a private fn and therefore the code is susceptible to change. I 
think this should be looked into more and become officially supported. This 
is a great hook that opens up the door to a more interactive development 
experience for clojurescript.

On Tuesday, September 18, 2012 2:00:08 AM UTC-4, FrankS wrote:

 I have the same requirement to have a clojurescript-form in my 
 clojure-environment that I want to evaluate in the browser… 

 To make the following code-snippet work, you're supposed to have a 
 browser-repl session running, and start a new repl-session on that same JVM 
 from where you invoke the following forms to execute either javascript-code 
 or clojurescript-forms in the browser. 

 --- 
 user= (require 'cljs.repl) 
 nil 

 user= (require 'cljs.repl.browser) 
 nil 

 user= (cljs.repl.browser/browser-eval alert('No Way!')) 
 {:status :success, :value } 

 user= (def my-repl-env {:port 9000, :optimizations :simple, :working-dir 
 .lein-cljsbuild-repl, :serve-static true, :static-dir [. out/], 
 :preloaded-libs []}) 
 #'user/my-repl-env 

 user= (def my-env {:context :statement :locals {}}) 
 #'user/my-env 

 user= (#'cljs.repl/eval-and-print my-repl-env my-env '(js/alert Yes 
 Way!)) 
 nil 
 nil 

 user= 
 --- 

 The public function cljs.repl.browser/browser-eval seems to allow you to 
 send javascript code as a string to the browser to execute over the 
 existing browser-repl connection. 

 The private function cljs.repl/eval-and-print will take a clojurescript 
 form, compile it to javascript and send it to the browser for execution. 
 The my-repl-env and my-env values are artifacts needed that are 
 normally only available within the context of the function. 

 My apology for this hugeugly hack… please see it as a proof of principle. 

 There may be much more elegant solutions available… I've only scratch the 
 surface of understanding how this clojurescript repl works in detail. 

 -Enjoy, FrankS 


 On Sep 17, 2012, at 9:03 PM, Brent Millare brent@gmail.comjavascript: 
 wrote: 

  And yes by eval I mean compile and run on the target (browser) 
  
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Re: mixing clojure source with java class files problem!


On 18/09/12 16:00, Aaron Cohen wrote:

The package is baked into the .class file format. You can't change it
after the fack by just moving files in the directory structure.


regardless of whether there is an actual package declaration?

So, you're saying that if I compile the java source inside a replicated 
directory structure as the one it will be consumed from, everything will 
be fine?
I honestly thought i could skip all that, by not having any packages at 
all! I also tried putting the class files right next to the clj files 
but again it wouldn't find them!



What are you trying to accomplish by doing this?


well, the short story is that I'm wrapping a library but I'm not 
completely satisfied with the way it does a couple of things...too many 
assumptions in some places - so I'm trying to sort of re-implement a 
couple of classes/interfaces and include them already compiled in a 
separate folder in the jar in case someone else faces similar issues. It 
took a while to write the java code and of course compile it 
successfully against all the prerequisites...now, apparently i need to 
recompile in a replicated dir structure...


I did not use proxy and the gang cos it just seemed easier (mutable 
variables/inheritance etc etc)


Jim

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Re: Calling Clojurescript code from Clojure

2012-09-18 Thread Brent Millare

Actually, after looking through the source myself, I noticed eval-and-print 
just calls evaluate-form, which is better since its public. I can take care 
of printing myself so this is probably better.

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Re: mixing clojure source with java class files problem!

It still not finding the compiled classes! I compiled them all using the 
exact same package declaration as the one found in the jar that I'm 
producing!
I was also careful to convert the hyphen (directory name) to an 
underscore (in the .java file)...


I am still getting a :

ClassNotFoundException encog_java.customGA.CustomNeuralGeneticAlgorithm 
java.net.URLClassLoader$1.run (URLClassLoader.java:366)


the jar i'm referring to is on clojars [enclog 0.5.6-SNAPSHOT] in case 
you have any doubts that the classes are in there...


any pointers are greatly appreciated...

Jim





On 18/09/12 16:16, Jim - FooBar(); wrote:

On 18/09/12 16:00, Aaron Cohen wrote:

The package is baked into the .class file format. You can't change it
after the fack by just moving files in the directory structure.


regardless of whether there is an actual package declaration?

So, you're saying that if I compile the java source inside a 
replicated directory structure as the one it will be consumed from, 
everything will be fine?
I honestly thought i could skip all that, by not having any packages 
at all! I also tried putting the class files right next to the clj 
files but again it wouldn't find them!



What are you trying to accomplish by doing this?


well, the short story is that I'm wrapping a library but I'm not 
completely satisfied with the way it does a couple of things...too 
many assumptions in some places - so I'm trying to sort of 
re-implement a couple of classes/interfaces and include them already 
compiled in a separate folder in the jar in case someone else faces 
similar issues. It took a while to write the java code and of course 
compile it successfully against all the prerequisites...now, 
apparently i need to recompile in a replicated dir structure...


I did not use proxy and the gang cos it just seemed easier (mutable 
variables/inheritance etc etc)


Jim



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Re: mixing clojure source with java class files problem!


decompiling a simple interface gives:

*package*encog_java.customGA;

*import*org.encog.ml.MLRegression;
*import*org.encog.ml.genetic.population.Population;

*public**abstract**interface*CalculateScore
{
*public**abstract**double*calculateScore(MLRegression paramMLRegression);

*public**abstract**boolean*shouldMinimize();

*public**abstract**void*setPopulation(Population paramPopulation);
}

the package declaration seems perfectly fine in the class files (as  
expected)...what on earth is happening? Tried both hyphen/underscore 
when :import-ing but i get the same error!


Jim

On 18/09/12 16:51, Jim - FooBar(); wrote:
It still not finding the compiled classes! I compiled them all using 
the exact same package declaration as the one found in the jar that 
I'm producing!
I was also careful to convert the hyphen (directory name) to an 
underscore (in the .java file)...


I am still getting a :

ClassNotFoundException 
encog_java.customGA.CustomNeuralGeneticAlgorithm 
java.net.URLClassLoader$1.run (URLClassLoader.java:366)


the jar i'm referring to is on clojars [enclog 0.5.6-SNAPSHOT] in 
case you have any doubts that the classes are in there...


any pointers are greatly appreciated...

Jim





On 18/09/12 16:16, Jim - FooBar(); wrote:

On 18/09/12 16:00, Aaron Cohen wrote:

The package is baked into the .class file format. You can't change it
after the fack by just moving files in the directory structure.


regardless of whether there is an actual package declaration?

So, you're saying that if I compile the java source inside a 
replicated directory structure as the one it will be consumed from, 
everything will be fine?
I honestly thought i could skip all that, by not having any packages 
at all! I also tried putting the class files right next to the clj 
files but again it wouldn't find them!



What are you trying to accomplish by doing this?


well, the short story is that I'm wrapping a library but I'm not 
completely satisfied with the way it does a couple of things...too 
many assumptions in some places - so I'm trying to sort of 
re-implement a couple of classes/interfaces and include them already 
compiled in a separate folder in the jar in case someone else faces 
similar issues. It took a while to write the java code and of course 
compile it successfully against all the prerequisites...now, 
apparently i need to recompile in a replicated dir structure...


I did not use proxy and the gang cos it just seemed easier (mutable 
variables/inheritance etc etc)


Jim





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Re: mixing clojure source with java class files problem!

What did you use to compile this? I don't believe hyphens are legal in
Java package names.

It will be hard to use this in clojure, clojure converts hyphens to
underscores automatically behind the scenes in package names. But your
package actually has a (possibly invalid) hyphen in it's name, so the
mangling prevents your class from being found.

--Aaron

On Tue, Sep 18, 2012 at 11:58 AM, Jim - FooBar(); jimpil1...@gmail.com wrote:
 decompiling a simple interface gives:

 package encog_java.customGA;

 import org.encog.ml.MLRegression;
 import org.encog.ml.genetic.population.Population;

 public abstract interface CalculateScore
 {
 public abstract double calculateScore(MLRegression paramMLRegression);

 public abstract boolean shouldMinimize();

 public abstract void setPopulation(Population paramPopulation);
 }

 the package declaration seems perfectly fine in the class files (as
 expected)...what on earth is happening? Tried both hyphen/underscore when
 :import-ing but i get the same error!

 Jim


 On 18/09/12 16:51, Jim - FooBar(); wrote:

 It still not finding the compiled classes! I compiled them all using the
 exact same package declaration as the one found in the jar that I'm
 producing!
 I was also careful to convert the hyphen (directory name) to an underscore
 (in the .java file)...

 I am still getting a :

 ClassNotFoundException encog_java.customGA.CustomNeuralGeneticAlgorithm
 java.net.URLClassLoader$1.run (URLClassLoader.java:366)

 the jar i'm referring to is on clojars [enclog 0.5.6-SNAPSHOT] in case you
 have any doubts that the classes are in there...

 any pointers are greatly appreciated...

 Jim





 On 18/09/12 16:16, Jim - FooBar(); wrote:

 On 18/09/12 16:00, Aaron Cohen wrote:

 The package is baked into the .class file format. You can't change it
 after the fack by just moving files in the directory structure.


 regardless of whether there is an actual package declaration?

 So, you're saying that if I compile the java source inside a replicated
 directory structure as the one it will be consumed from, everything will be
 fine?
 I honestly thought i could skip all that, by not having any packages at all!
 I also tried putting the class files right next to the clj files but again
 it wouldn't find them!

 What are you trying to accomplish by doing this?


 well, the short story is that I'm wrapping a library but I'm not completely
 satisfied with the way it does a couple of things...too many assumptions in
 some places - so I'm trying to sort of re-implement a couple of
 classes/interfaces and include them already compiled in a separate folder in
 the jar in case someone else faces similar issues. It took a while to write
 the java code and of course compile it successfully against all the
 prerequisites...now, apparently i need to recompile in a replicated dir
 structure...

 I did not use proxy and the gang cos it just seemed easier (mutable
 variables/inheritance etc etc)

 Jim



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Re: mixing clojure source with java class files problem!


On 18/09/12 17:28, Aaron Cohen wrote:

What did you use to compile this? I don't believe hyphens are legal in
Java package names.


I used regular

*javac -cp blah:blah:blah  encog-java/customGA/*.java*

the compiler did not complain because the actual package declaration 
uses underscore instead of hyphen.
yes hyphens are indeed illegal... that is, you cannot write package 
foo-bar; but you can write package foo_bar;  when in fact being in 
the foo-bar folder.



It will be hard to use this in clojure, clojure converts hyphens to
underscores automatically behind the scenes in package names. But your
package actually has a (possibly invalid) hyphen in it's name, so the
mangling prevents your class from being found.


exactly!!! when I ask from clojure  (:import [encog-java.customGA 
aClass]) clojure should convert the hyphen to match the actual package 
found in the declaration of class files. UNderscores are certainly legal 
characters...the thing is, it doesn't matter whether i use an underscore 
or not when importing - I always get the same error which makes me 
slightly suspicious...


In my desperation, I went into my ~/.m2 directory and actually modified 
the jar by hand so the folder encog-java was renamed to encog_java 
but again the same story! I don't get it!!!


Jim

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Re: mixing clojure source with java class files problem!

On Tue, Sep 18, 2012 at 12:39 PM, Jim - FooBar(); jimpil1...@gmail.com wrote:
 On 18/09/12 17:28, Aaron Cohen wrote:

 What did you use to compile this? I don't believe hyphens are legal in
 Java package names.


 I used regular

  javac -cp blah:blah:blah  encog-java/customGA/*.java

 the compiler did not complain because the actual package declaration uses
 underscore instead of hyphen.
 yes hyphens are indeed illegal... that is, you cannot write package
 foo-bar; but you can write package foo_bar;  when in fact being in the
 foo-bar folder.

 It will be hard to use this in clojure, clojure converts hyphens to
 underscores automatically behind the scenes in package names. But your
 package actually has a (possibly invalid) hyphen in it's name, so the
 mangling prevents your class from being found.

I was actually wrong here, I think. I should probably check closer,
but I now think that clojure only mangles its own package names when
necessary. I don't think it ever mangles doing pure interop.


 exactly!!! when I ask from clojure  (:import [encog-java.customGA aClass])
 clojure should convert the hyphen to match the actual package found in the
 declaration of class files. UNderscores are certainly legal characters...the
 thing is, it doesn't matter whether i use an underscore or not when
 importing - I always get the same error which makes me slightly
 suspicious...

 In my desperation, I went into my ~/.m2 directory and actually modified the
 jar by hand so the folder encog-java was renamed to encog_java but again
 the same story! I don't get it!!!

I actually just tried this (I don't recommend this approach though),
and it worked for me, maybe you missed a step.

 I think you'll have best luck if you make your directory structure
match the package name.

--Aaron

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Re: mixing clojure source with java class files problem!


On 18/09/12 17:50, Aaron Cohen wrote:

I actually just tried this (I don't recommend this approach though),
and it worked for me, maybe you missed a step.


what? seriously? You mean you downloaded the jar and managed to import 
some class from inside encog_java/customGA/ in some dummy project of yours ?


Jim

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Re: mixing clojure source with java class files problem!


On 18/09/12 17:50, Aaron Cohen wrote:

I actually just tried this (I don't recommend this approach though),
and it worked for me, maybe you missed a step.



what jar is lein2 using? the one with the nice name or the one with the 
numbers at the end? which one of the 2 did you modify?


Jim

ps: btw thanks a million for your time

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Re: mixing clojure source with java class files problem!

On Tue, Sep 18, 2012 at 12:54 PM, Jim - FooBar(); jimpil1...@gmail.com wrote:
 On 18/09/12 17:50, Aaron Cohen wrote:

 I actually just tried this (I don't recommend this approach though),
 and it worked for me, maybe you missed a step.



 what jar is lein2 using? the one with the nice name or the one with the
 numbers at the end? which one of the 2 did you modify?

 Jim

 ps: btw thanks a million for your time

The one with the full timestamp. I extracted the whole thing, renamed
the directory and recompressed it.

user= (import encog_java.customGA.CustomNeuralGeneticAlgorithm)
encog_java.customGA.CustomNeuralGeneticAlgorithm

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Re: ClojureScript dead-code elimination

2012-09-18 Thread Mimmo Cosenza

I'm studying clojurescript/closure to better understand if using 
clojurescript could be really a step ahead in developing rich web based 
application. So, I'm still a newbie. I found in some way useful this google 
service http://closure-compiler.appspot.com/home  to evaluate gclosure 
benefits form code reduction point of view.

In any case I think that the dead-code elimination is a great thing, but 
more importants, IMHO, are others two issues:

a) resolving impedance mismatch between FP/UI (functional reactive 
programming? use macro to minimize incidental complexity in using OO UI?) 

b) clojurescript debugging 

I would never choose clojurescript on the client-side just to obtain a 
dead-code reduction (in any case it's a plus), but because it can reduce 
develoment time and increase robustness.

Mimmo 

On Tuesday, September 18, 2012 4:03:29 PM UTC+2, Matt Campbell wrote:

 On 9/18/2012 8:57 AM, David Nolen wrote: 
  I've heard of several large 
  ClojureScript programs that generate 1.2-1.8 *megabytes* of 
  JavaScript. After advanced compilation and gzipping the applications 
  are around 40k-50k (http://blog.mezeske.com/?p=552). This is pretty 
  impressive given that jQuery, which is pretty standard these days, 
  itself is 32k gzipped. 

 That is indeed impressive. I'd say the overhead of ClojureScript in 
 small programs is a non-issue then. Sorry for making a fuss about it. 

 Matt 



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Re: mixing clojure source with java class files problem!


On 18/09/12 17:54, Jim - FooBar(); wrote:

On 18/09/12 17:50, Aaron Cohen wrote:

I actually just tried this (I don't recommend this approach though),
and it worked for me, maybe you missed a step.



what jar is lein2 using? the one with the nice name or the one with 
the numbers at the end? which one of the 2 did you modify?


Jim

ps: btw thanks a million for your time


 it's the jar with the funny numbers at the end!!! I was trying the 
other one with the proper name!


ok I guess I'll push one more SNAPSHOT without any hyphens/underscores!

thanks a lot Aaron... :-)

Jim

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instantiating a clojure record from Java

I want to instantiate a record and call a fn from java source code... 
I've got this in my .java file:


//prepare java-clojure interop
private static IFn requireFn = RT.var(clojure.core, require).fn();
static {requireFn.invoke(Symbol.intern(Clondie24.games.chess));} 
//the namespace
private static IFn fitnessFn = RT.var(Clondie24.games.chess, 
ga-fitness).fn();  //the fn I need






private int compete (final MLRegression contestant){
  BasicNetwork opponent = pickRandom();
   if (!contestant.equals(opponent))
return (Integer)fitnessFn.invoke(new 
Clondie24.games.chess.Player(contestant, 1),
 new 
Clondie24.games.chess.Player(opponent, -1));//the actual tournament

   else
return compete(contestant);  //recurse once
}



and this in my clj :

(defrecord Player [brain direction])

However i get again:  ClassNotFoundException Clondie24.games.chess.Player

It seems I've underestimated the degree of difficulty when going from 
clojure to java and back to clojure!


thanks for any pointers...

Jim


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Re: instantiating a clojure record from Java


trying at the repl:


(class (Player. nil 1))
 =Clondie24.games.chess.Player

if the fully-qualified name won't work I don't know what will! 
weird-stuff...


Jim



On 18/09/12 19:04, Jim - FooBar(); wrote:
I want to instantiate a record and call a fn from java source code... 
I've got this in my .java file:


//prepare java-clojure interop
private static IFn requireFn = RT.var(clojure.core, 
require).fn();
static {requireFn.invoke(Symbol.intern(Clondie24.games.chess));} 
//the namespace
private static IFn fitnessFn = RT.var(Clondie24.games.chess, 
ga-fitness).fn();  //the fn I need






private int compete (final MLRegression contestant){
  BasicNetwork opponent = pickRandom();
   if (!contestant.equals(opponent))
return (Integer)fitnessFn.invoke(new 
Clondie24.games.chess.Player(contestant, 1),
 new 
Clondie24.games.chess.Player(opponent, -1));//the actual tournament

   else
return compete(contestant);  //recurse once
}



and this in my clj :

(defrecord Player [brain direction])

However i get again:  ClassNotFoundException Clondie24.games.chess.Player

It seems I've underestimated the degree of difficulty when going from 
clojure to java and back to clojure!


thanks for any pointers...

Jim




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Re: Some feedback on clojurescript

2012-09-18 Thread Alexey Petrushin

 issues on JIRA
Theres a barrier - You has to register to JIRA to submit issue - many 
people won't bother with that and just ignore small bugs or proposals vs. 
almost everyone has github account.

 JVM
Yeah, would be nice to have JS-on-the-fly compiler (like CoffeeScript)

Would be also nice to have Node.js and NPM support.

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Re: Some feedback on clojurescript

On Tue, Sep 18, 2012 at 2:29 PM, Alexey Petrushin
alexey.petrus...@gmail.com wrote:
 issues on JIRA
 Theres a barrier - You has to register to JIRA to submit issue - many people
 won't bother with that and just ignore small bugs or proposals vs. almost
 everyone has github account.

Small bugs are submitted to JIRA all the time. It may be barrier for
some, but more contributions does not mean better contributions. The
contributions we've received so far have been stellar - so I'm
inclined to think the barrier is an illusion.

Bigger proposals generally need discussion - that's what the
clojure-dev mailing list and the Confluence design pages are for.

 JVM
 Yeah, would be nice to have JS-on-the-fly compiler (like CoffeeScript)

Yes it would, but by and large the users of ClojureScript are Clojure
users. So we haven't seen much real interest in this yet.

 Would be also nice to have Node.js and NPM support.

There is rudimentary support for Node.js. I think everyone would love
to see more support but any such additions will be driven by a
community of people that actively develop these desirable features.
The most popular usage of ClojureScript seems to be Clojure
applications that want to target browser based clients.

David

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Re: instantiating a clojure record from Java

2012-09-18 Thread Sean Corfield

On Tue, Sep 18, 2012 at 11:04 AM, Jim - FooBar(); jimpil1...@gmail.comwrote:

 However i get again:  ClassNotFoundException Clondie24.games.chess.Player


That suggests the Clojure code isn't AOT compiled and/or isn't on your
class path?
-- 
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An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/

Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)

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Re: Some feedback on clojurescript

2012-09-18 Thread Gergely Nagy

Wes Freeman freeman@gmail.com writes:

 A separate mailing list for ClojureScript would be great. Also, enabling
 the label [Clojure] for all subjects of emails would be great (this must be
 a setting in google groups, because most of the larger groups have it
 enabled), as I filter through a great deal of email I don't care about, and
 I actually would like to read the latest emails from the Clojure list.

As far as the subject prefix goes: there's already List-Id: and
X-BeenThere headers on all mails to the list, which you can filter
on. GMail supports these well too, so adding a label onto them to make
it clear what list a mail arrived to is very, very easy.

Personally, I like that everything Clojure-ish is here, from Clojure,
through ClojureCLR to ClojureScript. The subject usually makes it clear
which of those the mail is about, so it can easily be marked read.

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Confused by reference to capturing (as opposed to binding) in C. Grand's talk (not= DSL macros)

2012-09-18 Thread Alex Dowad

In his talk entitled (not= DSL macros), C. Grand recommends designing the 
core of a DSL with capturing rather than binding, then adding binding 
macros as an extra layer on top if desired.

I'm trying to understand what exactly he means by capturing in this 
context. I'm familiar with the use of the word capture to describe what 
lexical closures can do with variables from the surrounding scope, and also 
to describe what non-hygienic macros can do with variables from the 
surrounding scope, but it seems he's referring to something else here. A 
Google search doesn't bring up anything enlightening. Can anyone offer a 
brief explanation?

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Re: Confused by reference to capturing (as opposed to binding) in C. Grand's talk (not= DSL macros)

2012-09-18 Thread Baishampayan Ghose

Variable Capture (a common problem with unhygenic macros) can
introduce defects in your code.

Wikipedia has some info on it -
https://en.wikipedia.org/wiki/Common_Lisp#Variable_capture_and_shadowing

For more, you should take a look at On Lisp by Paul Graham.

Regards,
BG

On Tue, Sep 18, 2012 at 12:33 PM, Alex Dowad alexinbeij...@gmail.com wrote:
 In his talk entitled (not= DSL macros), C. Grand recommends designing the
 core of a DSL with capturing rather than binding, then adding binding
 macros as an extra layer on top if desired.

 I'm trying to understand what exactly he means by capturing in this
 context. I'm familiar with the use of the word capture to describe what
 lexical closures can do with variables from the surrounding scope, and also
 to describe what non-hygienic macros can do with variables from the
 surrounding scope, but it seems he's referring to something else here. A
 Google search doesn't bring up anything enlightening. Can anyone offer a
 brief explanation?

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Re: Confused by reference to capturing (as opposed to binding) in C. Grand's talk (not= DSL macros)

2012-09-18 Thread Alex Dowad

Dear B.G., thanks for your response. I already understand the problem of 
variable capture in macros well. However, is that really what C. Grand is 
talking about in (not= DSL macros)? If you have a video of the talk, the 
part where he talks about capturing comes at about 13:40.

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ANN Welle 1.3.1

2012-09-18 Thread Michael Klishin

Welle is an expressive Clojure client for Riak with batteries included.

1.3.1 is a bug fix release:

 * Welle now uses reasonable vclock pruning settings by default

Detailed change log:
https://github.com/michaelklishin/welle/blob/1.3.x-stable/ChangeLog.md

Documentation guides:
http://clojureriak.info
-- 
MK

http://github.com/michaelklishin
http://twitter.com/michaelklishin

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Re: Confused by reference to capturing (as opposed to binding) in C. Grand's talk (not= DSL macros)

2012-09-18 Thread Baishampayan Ghose

Apparently blip.tv is down now. I will take a look at the video when
it's available again and get back to you.

Regards,
BG

On Tue, Sep 18, 2012 at 12:47 PM, Alex Dowad alexinbeij...@gmail.com wrote:
 Dear B.G., thanks for your response. I already understand the problem of
 variable capture in macros well. However, is that really what C. Grand is
 talking about in (not= DSL macros)? If you have a video of the talk, the
 part where he talks about capturing comes at about 13:40.

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Re: array literal syntax

2012-09-18 Thread Andrew

In my ClojureScript unit tests, the following doesn't evaluate to true (= 
(array 1 2) (foo)) even though all foo does is return (array 1 2). 

What should I do differently?

On Tuesday, January 10, 2012 2:51:06 PM UTC-5, David Nolen wrote:

 There is no array literal syntax yet, but (array 22 33) should work for 
 you.

 On Tue, Jan 10, 2012 at 2:46 PM, billh2233 bill@gmail.comjavascript:
  wrote:

 How do I code an array literal in clojurescript that translates to an
 array literal in javascript? What's the syntax?

 If I code in clojurescript:
 ... [22 33] ...
 it translates to a javascript vector:
 cljs.core.Vector.fromArray([22,33])

 Javascript (fx/Animation) needs an array defining an X Y point and
 complains that this parameter is not an array.

 Thanks.

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Re: array literal syntax

On Tue, Sep 18, 2012 at 4:54 PM, Andrew ache...@gmail.com wrote:
 In my ClojureScript unit tests, the following doesn't evaluate to true (=
 (array 1 2) (foo)) even though all foo does is return (array 1 2).

 What should I do differently?

Those are primitive mutable arrays and are compared via identity.

David

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Re: array literal syntax

2012-09-18 Thread Andrew Cheng

FYI, in #clojure, duck11232 suggested the following which works for me.

(defn arr= [a b] (not (or ( a b) ( a b

On Tue, Sep 18, 2012 at 4:54 PM, Andrew ache...@gmail.com wrote:

In my ClojureScript unit tests, the following doesn't evaluate to true (=
(array 1 2) (foo)) even though all foo does is return (array 1 2).

What should I do differently?

On Tuesday, January 10, 2012 2:51:06 PM UTC-5, David Nolen wrote:

There is no array literal syntax yet, but (array 22 33) should work for
you.

On Tue, Jan 10, 2012 at 2:46 PM, billh2233 bill@gmail.com wrote:

How do I code an array literal in clojurescript that translates to an
array literal in javascript? What's the syntax?

If I code in clojurescript:
... [22 33] ...
it translates to a javascript vector:
cljs.core.Vector.fromArray([**22,33])

Javascript (fx/Animation) needs an array defining an X Y point and
complains that this parameter is not an array.

Thanks.

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Re: Modelling for DAG with identity map - or not?

2012-09-18 Thread Bob Hutchison


On 2012-09-16, at 3:21 PM, Patrik Sundberg patrik.sundb...@gmail.com wrote:

 I'm asking myself though if there's a more functional design for 
 accomplishing the same goals? My main goals are to do things consistently so 
 that changing a value X propagates properly, and being able to find 
 dependencies of a given value. A DAG+identity map is my first take, but there 
 may be something more natural for FP I'm completely missing.

Sounds like a reasonable approach to me. There's nothing wrong with state, just 
how you manipulate it. The STM in Clojure is really nice in this regard. You 
might want to have a look at Functional Reactive Programming (FRP). There's a 
lot of stuff available about that in the Haskell community, but usually for UIs 
and things like that. They sometimes use spread sheets as an example (spread 
sheets can be thought of as a DAG with values and computations in cells… you 
can see the mapping between them in your application (where the mapping doesn't 
work or is hard might be pointing at something quite interesting). There's also 
something called 'Cells' in Common Lisp that might be interesting. I'm not sure 
what's been done in Clojure.

Cheers,
Bob

 
 Thanks,
 Patrik
 

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Re: array literal syntax

On Tue, Sep 18, 2012 at 5:07 PM, Andrew Cheng ache...@gmail.com wrote:
 FYI, in #clojure, duck11232 suggested the following which works for me.

 (defn arr= [a b] (not (or ( a b) ( a b

This is not valid Clojure. Using this in CLJS will result in things
like the following:

(arr= (array 1) (array 1))
;; = true

 and  only have defined behavior when given numerical values - not
arrays, not strings, etc. Depending on this behavior is not
recommended.

David

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Re: Confused by reference to capturing (as opposed to binding) in C. Grand's talk (not= DSL macros)

2012-09-18 Thread Matching Socks


The Google can find a PDF by that name.  It uses capturing in the sense 
of regular expressions.  I think his idea is that in the DSL you identify 
or produce information (capture it), but you do not specify the names by 
which the user's program will refer to it (bind it).

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Re: Request to create new contrib: data.dependency

2012-09-18 Thread Stuart Sierra

I didn't get approval to create data.dependency, so instead I've merged 
that work into tools.namespace, currently available as 0.2.0-SNAPSHOT.

-S

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Re: array literal syntax

2012-09-18 Thread Andrew

I tried this but it didn't work. (identical? (array 1 2) (foo)) Did you 
mean this?

On Tuesday, September 18, 2012 5:08:11 PM UTC-4, David Nolen wrote:

 On Tue, Sep 18, 2012 at 4:54 PM, Andrew ach...@gmail.com javascript: 
 wrote: 
  In my ClojureScript unit tests, the following doesn't evaluate to true 
 (= 
  (array 1 2) (foo)) even though all foo does is return (array 1 2). 
  
  What should I do differently? 

 Those are primitive mutable arrays and are compared via identity. 

 David 


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Re: array literal syntax