Re: Help me improve and/or simplify this code
Salut Laurent, yes. That's probably even better. Meikel -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
Salut Laurent,
that's a good remark. Collecting and exporting of constants were conflated
in the previous version. So I added another API call: exported-constants.
Usually this are just the ones collected from the child nodes. But for ::fn
it's always empty.
; From your other mail
(defn processor
[pre post]
(fn this [form]
(let [form (pre form)
form (maybe recursive? update-children form this)]
(post form
(defmulti exported-constants :op)
(defmethod exported-constants :default
[form]
(:constants form))
(defmethod exported-constants ::fn
[_]
#{})
(defmulti collect-constants :op)
(defmethod collect-constants :default
[form]
form)
(defmethod collect-constants ::constant
[form]
(assoc form :constants #{(:form form)}))
(defmethod collect-constants ::recursive
[{:as form :keys [children]}]
(- children
(map exported-constants)
(reduce into #{})
(assoc form :constants)))
((processor set-unbox collect-constants) {:op ::fn :children [{:op ::let
:children [{:op ::constant :form 1} {:op ::fn :children [{:op ::constant
:form 2}]}]}]})
; = {:constants #{1}, :op :user/fn, :children ({:constants #{1}, :unbox
false, :op :user/let, :children ({:constants #{1}, :unbox true, :op
:user/constant, :form 1} {:constants #{2}, :unbox true, :op :user/fn,
:children ({:constants #{2}, :unbox true, :op :user/constant, :form 2})})})}
Note how the nested ::fn collects constants from its children but doesn't
export it to its parent without the need of a filter on parent level.
Never ask such things on the list; a discussion about simplified examples
may arise. ;) But hopefully the discussion is helpful for Aaron in his
endeavour.
Meikel
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Re: Help me improve and/or simplify this code
If I may venture an opinion here: aren't some people over-thinking and maybe even gold-plating this? My own version is succinct, and moreover when the requirements were changed/clarified it required only changing a single constants to [] in a single spot in a single line of code to adjust it. YAGNI, folks. *If and when* you need multimethods and other complications rather than condp etc. sufficing, due to evolving requirements, then elaborate. Until then, do the simplest thing that works. :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
2012/2/22 Cedric Greevey cgree...@gmail.com If I may venture an opinion here: aren't some people over-thinking and maybe even gold-plating this? My own version is succinct, and moreover when the requirements were changed/clarified it required only changing a single constants to [] in a single spot in a single line of code to adjust it. YAGNI, folks. *If and when* you need multimethods and other complications rather than condp etc. sufficing, due to evolving requirements, then elaborate. Until then, do the simplest thing that works. :) Peace :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: clj-webdriver: Clojure API for Selenium-WebDriver
Daniel, Thanks again for the effort you've put into documentation and release communication. It's first rate. Tavis -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Lack in the documentation
On Feb 20, 3:05 pm, Sean Corfield seancorfi...@gmail.com wrote: On Mon, Feb 20, 2012 at 1:48 AM, Sergey Didenko sergey.dide...@gmail.com wrote: It looks like our community already has a lot of articles, tutorials, gists, but they are just not very reachable to beginners. May be what we really need is a meta site or article on clojure.org or promotion of other meta site like http://stackoverflow.com/questions/tagged/clojure, with a lot of community rated links to existing resources? Folks could contribute tohttp://dev.clojure.org/display/doc/Home(I believe you need a CA on file and someone has to update your Confluence account permissions) but I believe this is the official hub for community-contributed documentation... Looking at clojure.org, I'd just assumed that the central community- driven documentation is the wiki ( http://en.wikibooks.org/wiki/Clojure_Programming ), which appears to include http://en.wikibooks.org/wiki/Learning_Clojure (why is it a separate wikibook?). A issue that all communities face though, is that some authors prefer to write their own articles and blog posts, rather than update and fine-tune the central community doc. It's understandable, since everyone has their own style (and their own favorite markup format) and it's also nice to get recognition for your very own linked-to and possibly-popular article/blog-post vs. shared authorship of a wiki book. As an aside, my hunch is that it may be easier to get folks to contribute to the wikibooks rather than contribute to http://dev.clojure.org/display/doc/Home --- partly because the wiki seems more familiar and easier to navigate compared to the Confluence site. Also, if the Confluence site requires a signed contributor agreement on-file, I'd bet that inhibits folks who just wanted to clarify a sentence, fix some grammar, add a small example, etc. Regarding a Clojure cookbook, I don't see any reason why it should be separate from the main community-driven wiki. So, my guess is that a good solution would be: 1. have one central wiki that the community is encouraged to monitor and contribute to (the 2 wikibooks?), 2. expand the wiki's cookbook section (possibly split it out into multiple sub-pages), and 3. have a page on that wiki that keeps a community-curated, categorized, and (important!) dated list of useful external articles (perhaps even roughly sorted by date --- newest at the top). I've gone ahead and created an [External Articles](http:// en.wikibooks.org/wiki/Clojure_Programming/External_Articles) page on the main wiki. If you've got any favorite articles and/or blog posts that you think would be useful to others, please add them (creating category sections for them as needed). ---John -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
Dear list, In the company where I work [1] we have an opening for a thesis project involving clojure, I’m posting the abstract proposal on this list since some reader might be interested. Here’s some information about the thesis Games configurations are structured collections of connected data represented by documents that drive game logic execution. Configurations need to be easily edited by non technical staff and then rendered in a variety of machine readable formats like xml, json or code. The topic of this thesis is to research the suitability of S- expression as primary representation format of game configurations and a lisp dialect as a primary mean of modifying, analysing, validating and converting configurations. The explicit intent is to take advantage of homoiconicity. Focus of the thesis is to assess and demonstrate advantages deriving by the adoption of S-expression and clojure versus the XML + XSD + OO programming language tool chain usually adopted to deal with this kind of tasks. Within this project a clojure (server component) and clojurescript (client component) application will be developed. The application will internally represents configurations as S- expression while offering an intuitive UI that will enable non technical user to edit configuration data while enforcing formal correctness by applying quantitative and logic constraints and exporting configurations in other formats. As an advanced task compilation of configurations to code in a destination programming language could be considered. The thesis will be developed on site in our office in Berlin, you’ll be embedded in a game team and mentored by one engineer. If you’re interested in this project you can contact me directly paolo.ne...@wooga.com or write to a...@wooga.com with the reference “GSE clojure” [1] Wooga is the third largest social game developer on facebook, every day 9 million persons play one or more of our games. If you’re curious about the company you can check our website http://www.wooga.com, our github page https://github.com/wooga or you can take a look at our engineering conference talks http://www.slideshare.net/wooga/tag/backend -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: mcache 0.1.0 released
On Feb 21, 5:58 am, Jim Crossley jcrossl...@gmail.com wrote: DHM davidhmar...@gmail.com writes: I want to announce the release of mcache 0.1.0: https://github.com/davidhmartin/mcache Very nice. One thing you might consider is implementing core.cache/CacheProtocol [1] in terms of mcache. I've done this [2] for the Infinispan data grid in Immutant. It'd be great to see another distributed option for pluggable memoization. Jim [1]https://github.com/clojure/core.cache [2]https://github.com/immutant/immutant/blob/master/modules/cache/src/ma... Thanks, I'll take a look at that. -Dave -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: mcache 0.1.0 released
I had looked at that but it wouldn't be a good candidate for forking in this case, because the approaches are different. Clojure-memcached talks to the low-level memcached api via socket connections, whereas mcache uses the spymemcached Java library via java interop. -Dave On Mon, Feb 20, 2012 at 8:20 PM, Leonardo Borges leonardoborges...@gmail.com wrote: There's this one: https://github.com/shughes/clojure-memcached It's two years old so definitely out of date but maybe worth forking? Cheers, Leonardo Borges www.leonardoborges.com On Sun, Feb 19, 2012 at 12:14 PM, DHM davidhmar...@gmail.com wrote: Hi, I want to announce the release of mcache 0.1.0: https://github.com/davidhmartin/mcache This provides protocol-based support for memcached and memcached-like clients, with an implementation using spymemcached. I coded this up in support of a web site I'm developing. I didn't find much in the way of existing clojure-based memcached support. I assume this is because it's easy enough to use the java apis directly, but it seemed like there can still be a benefit to putting a wrapper around these and adding some higher-level functionality. This initial version provides functions for add, set, replace, get, and incr/decr, plus a couple of additional functions supporting the caching of data fetched from a persistent store. I'm quite new to Clojure, so any feedback or suggestions of better ways to do things are more than welcome. Thanks! -Dave -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: ClojureScript for form
Hi David
That worked a treat. Thanks!
Adrian
On Feb 21, 4:55 am, David Nolen dnolen.li...@gmail.com wrote:
for creates lazy sequences - this can be a problem if you need side
effects. I suggest using doseq instead.
David
On Mon, Feb 20, 2012 at 11:26 AM, Adrian Mowat adrian.mo...@gmail.comwrote:
Hi Everyone,
I have been coding clojure for a few months and I've just started
using clojurescript and I am struggling to use for forms inside event
handlers. Sorry if this is covered elsewhere but I have searched as
best I can without finding the answers.
I have an event handler that listens for changes in an input element
(def search-input (dom/get-element search))
(def test-area (dom/get-element test-area))
(event/listen search-input
:keyup
(fn [e]
(let [search-results [a b]]
(dom/append test-area (dom/element :p {} (first search-
results)))
(dom/append test-area (dom/element :p {} (second search-
results))
It works fine. Everytime I type in the input box, some text is
appended to 'test-area'
However, this doesn't work any more when I switch to using for
(event/listen search-input
:keyup
(fn [e]
(let [search-results [a b]]
(for [x search-results] (dom/append test-area (dom/element :p {}
x))
Stepping through the generated code, I noticed that the generated
javascript calls the function with null as the first argument (second
last line below) but I can't figure out why or how to change the
behaviour.
clojure.browser.event.listen.call(null,
smws_numbers.cljs.smws_numbers.search_input, \ufdd0'keyup,
function() {
return function b(c) {
return new cljs.core.LazySeq(null, !1, function() {
for(;;) {
if(cljs.core.truth_(cljs.core.seq.call(null, c))) {
var d = cljs.core.first.call(null, c);
return cljs.core.cons.call(null,
clojure.browser.dom.append.call(null,
smws_numbers.cljs.smws_numbers.test_area,
clojure.browser.dom.element.call(null, \ufdd0'p,
cljs.core.ObjMap.fromObject([], {}), d)), b.call(null,
cljs.core.rest.call(null, c)))
}
return null
}
})
}.call(null, cljs.core.Vector.fromArray([a, b]))
});
I fell sure I'm missing something fairly basic, but it's escaping me
for now so any help you can provide would be greatly appreciated.
Many Thanks
Adrian
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Trouble using the fetch Clojurescript library.
hi,
I am putting together a small Clojurescript project and trying out Chris
Granger's library, fetch.
I can call functions defined in the fetch.util namespace no problem but
when ever I try and use things defined in the fetch.remotes namespace it
fails.
The compilation is successful but the browser spits an error saying that
the function in fetch.remotes is undefined.
Anyone got any ideas?
here is the namespace imports, second one work, first doesn't
(:require [fetch.remotes :as fr])
(:use [fetch.util :only [clj-js]])
Here is a sample of my project.clj file
(defproject my-proj 1.0.0-SNAPSHOT
:description FIXME: write description
:dependencies [[org.clojure/clojure 1.3.0]
[noir 1.3.0-alpha10]
[seesaw 1.3.1-SNAPSHOT]
[jayq 0.1.0-SNAPSHOT]
[fetch 0.1.0-SNAPSHOT]]
:cljsbuild [{:source-path src
:crossovers [proj.core]
:compiler {:output-dir resources/public/js
:output-to resources/public/js/my_proj.js
:externs [resources/externs/highcharts.js]
:optimizations :simple
:pretty-print false}}])
Cheers,
James
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Compilation model
Hi all, I had a question about clojure's compilation model, which my co-worker suggest to redirect here :-) I wonder what clojure does during compilation of a file? Can side-effects occur (definition of variables, functions, macros, etc in the compiler)? Does clojure have an EVAL-WHEN construct for specifying compile-time evaluations, or is there a convention for splitting code across different source files? And then, how does this tie in to a module system? Thanks in advance for any information or references :-) Yong -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: ClojureScript + Overtone
You, sir, are doing it right! Thanks for posting this. :) On 2/20/12 7:09 PM, Chris Granger wrote: People have been asking for an example using Noir and CLJS for a while, so today I threw together a recording and a blog post of me building an iPad controller for overtone :) HN link: http://news.ycombinator.com/item?id=3615022 Post: http://www.chris-granger.com/2012/02/20/overtone-and-clojurescript/ Cheers, Chris. signature.asc Description: OpenPGP digital signature
Re: MacOS menu bar time tracker in Clojure
it is cool On Tue, Feb 21, 2012 at 04:12, Philip K p...@eleven-percent.at wrote: Hey, I just made a text file based menu bar timer tracker as a weekend project in Clojure. It allows for easy task management using your favorite text editor, easy prioritization, time tracking and easy Dropbox integration; it doesn't scale well beyond a single person, but for small projects it may be a good alternative. If anybody wants to take a look, here is the repo: https://github.com/pkamenarsky/atea -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- https://twitter.com/number23_cn -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Trouble using the fetch Clojurescript library.
Sorry for the noise, this is working now. Really not sure what the problem was. Either I am misunderstanding something or the compilation process is a bit flaky. Cheers, James -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
love ? 2012/2/22 Cedric Greevey cgree...@gmail.com If I may venture an opinion here: aren't some people over-thinking and maybe even gold-plating this? My own version is succinct, and moreover when the requirements were changed/clarified it required only changing a single constants to [] in a single spot in a single line of code to adjust it. YAGNI, folks. *If and when* you need multimethods and other complications rather than condp etc. sufficing, due to evolving requirements, then elaborate. Until then, do the simplest thing that works. :) Peace :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- Softaddictslprefonta...@softaddicts.ca sent by ibisMail! -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
2012/2/22 Softaddicts lprefonta...@softaddicts.ca love ? I will always love you, Luc :-D 2012/2/22 Cedric Greevey cgree...@gmail.com If I may venture an opinion here: aren't some people over-thinking and maybe even gold-plating this? My own version is succinct, and moreover when the requirements were changed/clarified it required only changing a single constants to [] in a single spot in a single line of code to adjust it. YAGNI, folks. *If and when* you need multimethods and other complications rather than condp etc. sufficing, due to evolving requirements, then elaborate. Until then, do the simplest thing that works. :) Peace :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- Softaddictslprefonta...@softaddicts.ca sent by ibisMail! -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
On Wed, Feb 22, 2012 at 6:51 AM, Laurent PETIT laurent.pe...@gmail.com wrote: 2012/2/22 Cedric Greevey cgree...@gmail.com If I may venture an opinion here: aren't some people over-thinking and maybe even gold-plating this? My own version is succinct, and moreover when the requirements were changed/clarified it required only changing a single constants to [] in a single spot in a single line of code to adjust it. YAGNI, folks. *If and when* you need multimethods and other complications rather than condp etc. sufficing, due to evolving requirements, then elaborate. Until then, do the simplest thing that works. :) Peace :) I learned a lot from both solutions, thanks again to both. :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
This might interest you, it's not Clojure, but Lisp. Do you know the online game Vendetta? They have used Lisp extensively for non-player character behavior, and have a REPL integrated into the game. http://www.vendetta-online.com Vendetta Online has a Lisp environment (using SBCL) which controls much of its NPC behavior and will soon be in charge of generating player and NPC missions. Partly in order to get around some thread-safety issues, and partly for convenience we built an REPL into a secret chat channel. (it only responds to developer accounts) http://www.a1k0n.net/2005/11/04/lisp-repl-vendetta-online.html Later they started using Erlang in combination with Lisp since they had some problems with concurrency and garbage collection in SBCL. http://www.vendetta-online.com/x/msgboard/1/15560#196333 We chose common lisp primarily for its rapid-prototyping capabilities. In CL, it is very easy to define 'mini-languages', which is what I've done for missions, objectives, senses, reflexes, state-machines, business-models and more. All the code written in these special languages will remain untouched, and be auto-translated (by CL code) into erlang. As I develop new missions, reflexes, etc, I will continue to use the mini-languages; the processes they describe will simply be running on a distributed, fault-tolerant, erlang-based platform instead of the simplistic single-threaded one they have been running on. We had hoped for the simplistic system to continue to serve for a while yet, so that we could focus on player-visible features, but we always knew it would need to be made more scalable at some point. If you know of a 'more mainstream (/debugged/tested/reliable)' language/runtime than erlang that provides: 1) *very* light-weight processes 2) distributed, message-passing concurrency; 3) unification/pattern-matching 4) a soft-real-time, distributed, disk and/or ram-based relational/object database usable with or without transactions (just a few of mnesia's features), 5) facilities for zero-downtime code-upgrades, and other high-availability features 6) a powerful enough set of semantics (eg. closures) to make auto-translation from lisp less painful than a complete rewrite - Raju -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: Help me improve and/or simplify this code
You're welcome. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
Erlang's actor model seems like a perfect fit to MMORPG development -- maybe even more so than Lisp. On the other hand, Lisp letting you update things on the fly is also of obvious value to an MMORPG, which tends to involve adding and tweaking stuff from time to time but you really don't want to take the game servers down, ever, if you can avoid it. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
On the other hand, Lisp letting you update things on the fly is also of obvious value to an MMORPG, which tends to involve adding and tweaking stuff from time to time but you really don't want to take the game servers down, ever, if you can avoid it. That's also a major feature of Erlang. On-the-fly code updating is actually one of its strengths. http://en.wikipedia.org/wiki/Erlang_(programming_language)#Hot_code_loading_and_modules That being said, the syntax of Erlang is so insanely bad, I can't bring myself to touch it. Timothy -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
I haven't written such code myself, but one motivation for creating Erlang was software for telecommunications systems, where they have very high uptime requirements and needed the ability to update code on a running system. It can replace definitions of functions in place as well as any Lisp. Andy On Feb 22, 2012, at 8:37 AM, Cedric Greevey wrote: Erlang's actor model seems like a perfect fit to MMORPG development -- maybe even more so than Lisp. On the other hand, Lisp letting you update things on the fly is also of obvious value to an MMORPG, which tends to involve adding and tweaking stuff from time to time but you really don't want to take the game servers down, ever, if you can avoid it. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
On Wed, Feb 22, 2012 at 11:40 AM, Timothy Baldridge tbaldri...@gmail.com wrote: On the other hand, Lisp letting you update things on the fly is also of obvious value to an MMORPG, which tends to involve adding and tweaking stuff from time to time but you really don't want to take the game servers down, ever, if you can avoid it. That's also a major feature of Erlang. On-the-fly code updating is actually one of its strengths. http://en.wikipedia.org/wiki/Erlang_(programming_language)#Hot_code_loading_and_modules That being said, the syntax of Erlang is so insanely bad, I can't bring myself to touch it. Sounds like what we need is a Lisp with the actor model. Ideally, Clojure with a distributed version of agents, maybe built on top of agents and Java's RMI. Then again, what you said about Erlang's syntax lots of people say about Lisp's. ;) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
Have you looked at Akka http://akka.io/ at all? ~Adam~ -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
On Wed, Feb 22, 2012 at 12:08 PM, Adam les...@gmail.com wrote: Have you looked at Akka at all? Looks like it's a Java library. Using it apparently involves a fair amount of subclassing, so we'd probably want to write at least a partial clojure wrapper instead of users having to write proxy this, reify that all over their code. :) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: ANN travis-ci.org, a hosted CI service for the open source community with first class Clojure support
On Feb 21, 2012, at 5:44 PM, Phil Hagelberg wrote: Michael Klishin michael.s.klis...@gmail.com writes: travis-ci.org is a hosted continuous integration system for the open source community. It started in the Ruby community in 2011; since then, it has grown to support Erlang, Clojure, Node.js, PHP, Java, Groovy, and Scala, and now hosts over 6000 projects, including some big names like Ruby on Rails, RubyGems, Bundler, Leiningen, parts of JRuby, Node.js, Rubinius and so on. We've been using Travis for Leiningen and it's been quite useful. Looking forward to seeing where it goes from here. Seconded. I started using it with Clutch a few months ago, joyfully. The build pass/fail badges are particularly nice (you can see one @ https://github.com/clojure-clutch/clutch), as they give potential new users of libraries a clear indication of the health and sanity of the project. All in all, a much more pleasant and productive experience than mucking about with hudson/jenkins. - Chas -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 training in Europe/UK??
I'm interested in taking some hands-on, training in Clojure. Is there anyone in Europe that offers such public training courses? thanks in advance. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
Perhaps SXML could help the writer a bit http://en.wikipedia.org/wiki/SXML On 02/21/2012 02:55 PM, Paolo Negri wrote: Dear list, In the company where I work [1] we have an opening for a thesis project involving clojure, I’m posting the abstract proposal on this list since some reader might be interested. Here’s some information about the thesis Games configurations are structured collections of connected data represented by documents that drive game logic execution. Configurations need to be easily edited by non technical staff and then rendered in a variety of machine readable formats like xml, json or code. The topic of this thesis is to research the suitability of S- expression as primary representation format of game configurations and a lisp dialect as a primary mean of modifying, analysing, validating and converting configurations. The explicit intent is to take advantage of homoiconicity. Focus of the thesis is to assess and demonstrate advantages deriving by the adoption of S-expression and clojure versus the XML + XSD + OO programming language tool chain usually adopted to deal with this kind of tasks. Within this project a clojure (server component) and clojurescript (client component) application will be developed. The application will internally represents configurations as S- expression while offering an intuitive UI that will enable non technical user to edit configuration data while enforcing formal correctness by applying quantitative and logic constraints and exporting configurations in other formats. As an advanced task compilation of configurations to code in a destination programming language could be considered. The thesis will be developed on site in our office in Berlin, you’ll be embedded in a game team and mentored by one engineer. If you’re interested in this project you can contact me directly paolo.ne...@wooga.com or write to a...@wooga.com with the reference “GSE clojure” [1] Wooga is the third largest social game developer on facebook, every day 9 million persons play one or more of our games. If you’re curious about the company you can check our website http://www.wooga.com, our github page https://github.com/wooga or you can take a look at our engineering conference talks http://www.slideshare.net/wooga/tag/backend -- Eduardo Bellani omnia mutantur, nihil interit. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 training in Europe/UK??
Yes! Luke VanderHart and I will be teaching a 3-day Clojure course at EuroClojure in May. http://euroclojure.com/2012/3-day-clojure-training/ -Stuart Sierra clojure.com -- 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 Note that posts from new members are moderated - please be patient with your first post. 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
options for a function
clojure.data.csv has options for the following:
(defn write-csv
Writes data to writer in CSV-format.
Valid options are
:separator (Default \\,)
:quote (Default \\\)
:guote? (A predicate function which determines if a string should
be quoted. Defaults to quoting only when necessary.)
:newline (:lf (default) or :cr+lf)
[writer data options]
(let [opts (into {} options)
separator (or (:separator opts) \,)
quote (or (:quote opts) \)
quote? (or (:quote? opts) #(some #{separator quote \return
\newline} %))
newline (or (:newline opts) :lf)]
snip
Since (into {} options) is used to get the options into a map, it
seems that you need to specify options in this (write-csv writer data
[:separator \;] [:newline :lf+cr]).
Is this the recommended way to offer options? I was expecting (write-
csv writer data :separator \; :newline :lf+cr).
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Re: options for a function
I don't know that there is necessarily a recommended way to offer
options. Sometimes people want keyword options, sometime the want to
take options as a map, sometimes they need to do it one way or another
for various reasons, sometime they do it one way and later learn of a
better way.
To take options in the way you have specified, you can use
destructuring to simplify:
(defn write-csv [writer data {:as opts}] ...)
- or -
(defn write-csv [writer data {:keys [separator quote ...]}] ...)
- or -
(defn write-csv [writer data {:keys [separator quote ...] :as opts}] ...)
On Wed, Feb 22, 2012 at 3:47 PM, Michael michael-a...@db.com wrote:
clojure.data.csv has options for the following:
(defn write-csv
Writes data to writer in CSV-format.
Valid options are
:separator (Default \\,)
:quote (Default \\\)
:guote? (A predicate function which determines if a string should
be quoted. Defaults to quoting only when necessary.)
:newline (:lf (default) or :cr+lf)
[writer data options]
(let [opts (into {} options)
separator (or (:separator opts) \,)
quote (or (:quote opts) \)
quote? (or (:quote? opts) #(some #{separator quote \return
\newline} %))
newline (or (:newline opts) :lf)]
snip
Since (into {} options) is used to get the options into a map, it
seems that you need to specify options in this (write-csv writer data
[:separator \;] [:newline :lf+cr]).
Is this the recommended way to offer options? I was expecting (write-
csv writer data :separator \; :newline :lf+cr).
--
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Re: Help me improve and/or simplify this code
It occurs to me that a simpler no-library-needed way to get something like actors in Clojure would be to just send forms over the network to other nodes. The simplest thing would be to send forms to *eval*. But that requires some serious security precautions. Like, say, authentication plus encryption of the links. Another thing would be to set up an agent server which receives forms the reader can read. These would *not* be sent to eval; instead, just passed through the reader (with read-eval false to close a possible security hole) and then (apply send-off (map my-resolve form)). The first element of the form should, therefore, name an agent on the target node; the next, a function that exists in the namespace where the agent server is in that node; and optional arguments to that function. If the nodes all share a common codebase then the defs and defns will be the same, including the defs of agents and the defns of functions to invoke them on. The my-resolve function is a tricky detail: it needs to resolve symbols to Vars and leave everything else alone, a kind of weak eval. This could still be maliciously misused, by triggering arbitrary actions by arbitrary actors (enabling cheating in games, for instance) and by sending lots of CPU-heavy requests as a denial of service attack. Authentication and encryption would still be a good idea here, but not using full eval on the traffic adds another layer of protection. Someone who cracks the encryption can cheat at your MMORPG but not send, say, (System/exec rm -rf /). (Not running the nodes as root provides still more damage limitation, of course.) Also, handing the guys that might want to cheat the decryption key would be stupid, so this protocol would obviously be used internally by the server (a distributed network of game hosting machines) with some other, much less generally-capable protocol between these and clients to limit the possibilities for cheating using a nonstandard client. (Things analogous to client-side gold-farming bots or super-reflex-equipped combat bots will always be possible, of course. There's no in-principle way to be sure it's carbon rather than silicon sitting in the player's chair, other than if commands are sent absurdly fast. Even 24/7 farming for weeks without letup could be humans working in shifts.) -- 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 Note that posts from new members are moderated - please be patient with your first post. 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 thesis opportunity
On Feb 22, 6:00 pm, Cedric Greevey cgree...@gmail.com wrote: On Wed, Feb 22, 2012 at 11:40 AM, Timothy Baldridge tbaldri...@gmail.com wrote: On the other hand, Lisp letting you update things on the fly is also of obvious value to an MMORPG, which tends to involve adding and tweaking stuff from time to time but you really don't want to take the game servers down, ever, if you can avoid it. That's also a major feature of Erlang. On-the-fly code updating is actually one of its strengths. http://en.wikipedia.org/wiki/Erlang_(programming_language)#Hot_code_l... That being said, the syntax of Erlang is so insanely bad, I can't bring myself to touch it. Sounds like what we need is a Lisp with the actor model. Ideally, Clojure with a distributed version of agents, maybe built on top of agents and Java's RMI. Then again, what you said about Erlang's syntax lots of people say about Lisp's. ;) Thanks everyone for the interesting replies and pointers to other resources. I find pretty intriguing that erlang and the actors came up in this thread since we already do write game backend in erlang and we reported reported regularly about our experience at conferences [1], [2], [3]. Indeed the actor pattern is a very effective way of modeling game servers and the erlang OTP framework offers out of the box with tools and constructs that simplify dealing with the complexity of a multitude of concurrently evolving states. Still, the topic of this thesis is not really focused on game servers but about improving how games are configured, balancing the values that drive the evolution and progresse in virtual words is a very interesting and complex task, configurations appears as naked data but they actively drive the execution of many aspects of games, in some way you might think about configuration as a form of execution plan game logic, this is why having configuration in a form that can be interpreted both as data and code is of special interest. Another interesting aspect is that in our erlang game server we take XML configurations files and generate code (each XML file is compiled into an erlang module) so our servers effectively are configured by code, not data, this also make it easier to upgrade configurations on a running system thanks to the erlang hot code reload facilities, changin configuration actually mean running a newer version of the configuration code. I'm looking forward to your comments and ideas on the topic. [1] http://www.slideshare.net/wooga/from-0-to-100-daily-users-with-erlang [2] http://www.erlang-factory.com/conference/London2011/speakers/PaoloNegri [3] http://www.erlang-factory.com/conference/SFBay2011/speakers/PaoloNegri Thanks. -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: options for a function
This seems like a bug in clojure.data.csv and someone should create a
JIRA ticket for it, perhaps with a patch?
http://dev.clojure.org/jira/browse/DCSV
This once again makes me question why this CSV library ended up in
contrib (without any discussion) rather than the more actively
maintained and widely used clojure-csv library by David Santiago -
https://github.com/davidsantiago/clojure-csv
On Wed, Feb 22, 2012 at 1:17 PM, Mark Rathwell mark.rathw...@gmail.com wrote:
I don't know that there is necessarily a recommended way to offer
options. Sometimes people want keyword options, sometime the want to
take options as a map, sometimes they need to do it one way or another
for various reasons, sometime they do it one way and later learn of a
better way.
To take options in the way you have specified, you can use
destructuring to simplify:
(defn write-csv [writer data {:as opts}] ...)
- or -
(defn write-csv [writer data {:keys [separator quote ...]}] ...)
- or -
(defn write-csv [writer data {:keys [separator quote ...] :as opts}] ...)
On Wed, Feb 22, 2012 at 3:47 PM, Michael michael-a...@db.com wrote:
clojure.data.csv has options for the following:
(defn write-csv
Writes data to writer in CSV-format.
Valid options are
:separator (Default \\,)
:quote (Default \\\)
:guote? (A predicate function which determines if a string should
be quoted. Defaults to quoting only when necessary.)
:newline (:lf (default) or :cr+lf)
[writer data options]
(let [opts (into {} options)
separator (or (:separator opts) \,)
quote (or (:quote opts) \)
quote? (or (:quote? opts) #(some #{separator quote \return
\newline} %))
newline (or (:newline opts) :lf)]
snip
Since (into {} options) is used to get the options into a map, it
seems that you need to specify options in this (write-csv writer data
[:separator \;] [:newline :lf+cr]).
Is this the recommended way to offer options? I was expecting (write-
csv writer data :separator \; :newline :lf+cr).
--
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clojure.java.jmx 0.1 - problem getiing java.lang:type=Threading :AllThreadIds attribute
I was trying to convert result of JMX attributes query to JSON, and encountered problem while reading one particular attribute value of java.lang:type=Threading. Here is the REPL transcript: demo.server= (require '[clojure.java.jmx :as jmx]) nil demo.server= (jmx/read java.lang:type=Threading :AllThreadIds) #long[] [J@1bd97d0d demo.server= This seems to be Java long array reference, The jmx/mbean function that returns all attribute name as keywords associated with their values carries this value through. Attempt to convert such map to JSON string causes exception, since in this case a clojure vector of longs would be expected instead of Java array. This particular piece information (list of application ThreadIs) is not of particular interest to me anyway, so it is easy just to remove the offending map entry as a workaround. I have noticed some recent activity in clojure.java.jmx github repo, so I thought it would be appropriate to rise this issue, since it may be affecting some other attributes as well. Regards Zoka -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: options for a function
I'll fix this today. Thanks, Jonas -- 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 Note that posts from new members are moderated - please be patient with your first post. 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: options for a function
I just pushed the fix to github and released version 0.1.2. Sorry for the inconvenience. I'm not really happy with the write part of data.csv. In the clojure spirit of simplicity it complects quoting of values with writing to disk. There might be different policies for when an api-user wants there values to be quoted: * Quote everything (this can be done by setting :quote? to (constantly true) * Quote nothing (this can be done by setting :quote? to (constantly false)) * Quote only when necessary (this is the default) * Quote only the first row (i.e,, header) * Quote (for example) the first and third column * etc. I thought about this a couple of days ago and the best I could come up with was to remove quoting from the writing part and have users quote there values as a pre-processing step before writing. If that is the way forward then there is almost nothing more to do in the writing part of the data.csv, e.g., you could just as well write (with-open [w (io/writer some-file)] (with-binding [*out* w] (doseq [row data] (println (string/join , row))) So It's not entirely clear to me if csv-write is needed at all and instead have a few helper functions, for example (quote-string s \'), together with a good description of how to use with-binding, doseq, str/join etc. in the README file. Ideas welcome. Jonas -- 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 Note that posts from new members are moderated - please be patient with your first post. 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
