#clojure – 2009-12-19

2009-12-19

00:19	jasapp	does anyone remember how to use the different regular expression flags?
00:20	somnium`	like #"(?i)FoObAr+" ?
00:20	jasapp	yup, that's what I was looking for
00:20	jasapp	thanks
00:21	jasapp	is that in the docs anywhere? I couldn't find it
00:21	_ato	http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html
00:21	_ato	probably the Clojure documentation should link to that
00:21	somnium`	a perl/javascript syntax would be nice
00:22	somnium`	maybe with cinc
00:24	chouser	is it that different?
00:24	somnium`	no
00:25	somnium`	mostly just move the flags to the end it appears
00:26	devlinsf	chouser: ping
00:26	chouser	devlinsf: hi!
00:26	devlinsf	Just saw your feedback
00:27	devlinsf	I modified withMeta because the original code use it
00:27	devlinsf	Wanted to do something "Similar"
00:28	devlinsf	Do you know why the use of EMPTY is there?
00:28	devlinsf	(That was causing the bug, btw)
00:29	devlinsf	Hmm... I wonder if withMeta loses the comparator
00:29	chouser	that's how the other collections do it
00:30	chouser	devlinsf: it used to, I think, but was fixed by using the two-arg constructors. :-)
00:31	devlinsf	Right
00:31	devlinsf	So, should I just break convention here?
00:31	devlinsf	(A quick REPL test shows we're okay)
00:32	chouser	I can't tell you what rhickey is more likely to accept, but that's what I'd do.
00:33	devlinsf	Okay. I'm adding a comment to explain the deviation in the source.
00:34	devlinsf	Should I include some tests too?
00:34	chouser	well, it's different from what used to be there and from the other collections, but it's a pattern used elsewhere in that file.
00:35	chouser	if you want, sure. tests are great. if you do, please put them in the same patch file, though they can be a separate commit if you want.
00:36	devlinsf	Hmm... sounds good
00:37	devlinsf	I'm curious. What's the process of these patches getting into core? Does Rich review all of them?
00:37	chouser	yep, each and every one.
00:37	devlinsf	Okay.
00:39	chouser	I think if people comment that the patch is good, he may be able to approve it more easily, I'm not sure.
00:40	devlinsf	Well, I appreciate the review
00:40	chouser	once he approves, he or I can push it to github.
00:40	chouser	sure, happy to have the help. thanks!
00:41	chouser	I have no sense if he'll want this in 1.1 or not, but I'd like it to be.
00:43	devlinsf	Me too
00:43	devlinsf	It's a bug fix, so that's gotta make the case easier, right?
00:43	chouser	I'd think so.
00:44	chouser	ok, bedtime. thanks again for working on this.
00:45	devlinsf	np
00:46	devlinsf	I'll have patch #2 ready tonight
02:27	scottj_	Does technomancy's swank-clojure try to use tramp to find the source of a function and bail on Windows or is it something else in my setup?
02:27	scottj_	(M-.)
03:41	LauJensen	Morning gents
04:24	triyo	The bean function returns a map that represents the bean. The map contains the :class key with the Class value. When running (json-str (bean my-bean)) it complains about the Class value bound to :class as json write process doesn't know how to convert it I guess.
04:24	triyo	one solution I can think of is to dissoc the :class, is this the best option?
04:25	triyo	also, how do I do this when the bean in question could have number of nested levels of beans with their own :class keys
04:32	triyo	ok, the json lib source says the following: "You can extend this library to handle new types by adding methods to
04:32	triyo	print-json."
05:38	Bjering	What am I doing wrong here?
05:38	Bjering	(build-dataflow[(cell :source a) (cell b (* 2 ?a))])
05:52	vegai	what's the error? Are you supposed to have a space before [?
05:55	Bjering	#<Object java.lang.Object@d70b42>) (NO_SOURCE_FILE:0)>
05:56	Bjering	ah
05:57	Bjering	found it, a missing arg when defining cell a
05:57	vegai	ah, right
05:57	Bjering	This worked (build-dataflow [(cell :source a 0) (cell b (* 2 ?a))])
06:18	hamza	hey guys, i would like to call a function with side effects n times is there a repeat like call for this? i don't care about the return value.
06:19	_ato	,(doc dotimes)
06:19	clojurebot	"([bindings & body]); bindings => name n Repeatedly executes body (presumably for side-effects) with name bound to integers from 0 through n-1."
06:20	_ato	,(dotimes [i 3] (println "hi"))
06:20	clojurebot	hi hi hi
06:21	hamza	_ato: thanks a lot.
07:18	Ankou	hi, the documentation of clojure.walk talks of some examples but where are those examples?
07:22	Ankou	because I can't figure out what clojure.walk is doing?
07:37	hoeck	Ankou: there are some examples of walk at the bottom of its source
07:42	hoeck	Ankou: for example, there: http://github.com/richhickey/clojure/blob/master/src/clj/clojure/walk.clj#L52
08:46	interferon	i compiled a clojure file to java bytecode. when i run it from the command line with "java" it runs everything in -main, but then doesn't terminate
08:46	interferon	could it be because of still-running threads?
08:48	the-kenny	hm.. good question
08:53	interferon	actually, it did terminate after maybe a minute
08:54	notallama	man. glsl is really picky. (or my implementation is). in a for loop, "++i" works, but "i = i + 1" does not.
08:54	interferon	but there's nothing in -main except a print statement, and that has already passed
08:57	notallama	also, would anyone here be interested in a clojure wrapper for lwjgl? i'm working on one, and i'll probably put it on github soon. (i'm going a different direction than penumbra. less gpgpu, more game engine)
08:57	the-kenny	notallama: Sounds cool
08:58	the-kenny	I would at least try it
08:59	notallama	i just got a geometry shader running in it. :) i'll probably put it up and make a post later today or tomorrow.
09:01	interferon	any way to pass in a default value for a param?
09:01	interferon	do i have to do (def foo ([x] (foo x 0)) ([x y] ...)) ?
09:04	jasapp	take a look at defnk in clojure.contrib.def
09:05	interferon	,defnk
09:05	clojurebot	java.lang.Exception: Unable to resolve symbol: defnk in this context
09:07	jasapp	,(require 'clojure.contrib.def)
09:07	clojurebot	nil
09:07	jasapp	,defnk
09:07	clojurebot	java.lang.Exception: Unable to resolve symbol: defnk in this context
09:08	jasapp	heh
09:08	jasapp	,clojure.contrib.def/defnk
09:08	the-kenny	,clojure.contrib.def/defnk
09:08	clojurebot	java.lang.Exception: Can't take value of a macro: #'clojure.contrib.def/defnk
09:08	clojurebot	java.lang.Exception: Can't take value of a macro: #'clojure.contrib.def/defnk
09:08	jasapp	it's early, I'm slow this morning :)
09:08	lpetit	,(doc defnk)
09:08	clojurebot	"clojure.contrib.def/defnk;[[fn-name & fn-tail]]; Define a function accepting keyword arguments. Symbols up to the first keyword in the parameter list are taken as positional arguments. Then an alternating sequence of keywords and defaults values is expected. The values of the keyword arguments are available in the function body by virtue of the symbol corresponding to the keyword (cf. :keys destructuring). defnk accepts
09:08	lpetit	~source defnk
09:09	lpetit	not so early in France :-p
09:11	jasapp	true
09:12	lpetit	there has been also a discussion recently (one to two month from today) on the ml concerning a generalization of defnk via something called like (if I remember correctly) let-kw ...
09:14	jasapp	that'd be interesting
09:14	lpetit	there it is: http://groups.google.com/group/clojure/browse_thread/thread/d6b5fa21073541c1/551f6527b31900ca?lnk=gst&q=defnk#551f6527b31900ca
09:14	jasapp	I have to admit, I do miss cl's default arguments
09:16	lpetit	~lisppaste
09:16	clojurebot	lisppaste8: url
09:16	lisppaste8	To use the lisppaste bot, visit http://paste.lisp.org/new/clojure and enter your paste.
09:16	lisppaste8	lpetit pasted "last version of let-kw placed on the ml" at http://paste.lisp.org/display/92353
09:17	lpetit	must leave, bye guys
09:17	jasapp	thanks for that link
09:17	jasapp	bye
09:28	patrkris	The documentation for clojure and clojure-contrib found on clojure.org/api is for clojure 1.1? Is there anywhere documentation can be found for just 1.0? I'm just asking out of curiosity.
10:04	devlinsf	,(transient (sorted-map 1 2 3 4))
10:04	clojurebot	java.lang.ClassCastException: clojure.lang.PersistentTreeMap cannot be cast to clojure.lang.IEditableCollection
11:13	LauJensen	Mostly for the young: I blogged about 4 simple Rosetta problems as well as the Rosetta project: http://www.bestinclass.dk/index.php/2009/12/rosetta-serving-dish-4/
11:32	jasapp	LauJensen: cool
11:58	a_strange_guy	clojurebot: paste?
11:58	clojurebot	lisppaste8, url
11:58	lisppaste8	To use the lisppaste bot, visit http://paste.lisp.org/new/clojure and enter your paste.
11:59	lisppaste8	devlinsf pasted "test" at http://paste.lisp.org/display/92355
12:05	lisppaste8	a_strange_guy pasted "cond-let?" at http://paste.lisp.org/display/92356
12:05	a_strange_guy	hi everyone
12:05	a_strange_guy	does anyone use cond-let from contrib?
12:06	devlinsf	Hmmm... what ns is it in?
12:06	a_strange_guy	in c.c.cond
12:07	a_strange_guy	i thought that it works like if-let
12:07	a_strange_guy	was trying to replace my nested if-lets with it
12:08	devlinsf	Never use it much
12:08	a_strange_guy	but it doesn't work as expected, and the docs dont make any sense to me
12:09	devlinsf	Yeah, the docs are opaque
12:10	ksm	How do I force a stop in the repl?
12:11	devlinsf	ksm: C-c C-c
12:11	devlinsf	At least, that works in SLIME
12:11	the-kenny	devlinsf: In Emacs, of course
12:11	ksm	I'm using the vimclojure
12:12	devlinsf	ksm: Enclojure has a "reset REPL" option
12:12	devlinsf	Sorry, can't help :
12:12	devlinsf	:(
12:14	a_strange_guy	does emacs+slime provide a better repl than enclojure?
12:15	the-kenny	a_strange_guy: Emacs + Slime is the nonplusultra for lisp programming.
12:16	a_strange_guy	gotta try emacs for once ^^
12:16	devlinsf	I love SLIME. The one thing I like about Enclojure better is that it does a better job of handling classpath/build stuff. I wish emacs had support for easy classpath stuff
12:17	the-kenny	devlinsf: It has: M-x swank-clojure-project
12:17	a_strange_guy	how well does slime handle completions?
12:17	devlinsf	Oh?
12:17	a_strange_guy	clojure aswell as java completions
12:17	the-kenny	devlinsf: If you have a "default" setup (lib/ src/ and classes/) you can invoke swank-clojure-project on the dir and emacs will start a repl
12:17	devlinsf	the-kenny: Could you post a link to docs for that
12:18	the-kenny	devlinsf: It's perfect if you use leiningen
12:18	the-kenny	Stand By
12:18	the-kenny	devlinsf: http://github.com/technomancy/swank-clojure "Project Layout"
12:18	the-kenny	(In the Readme)
12:19	devlinsf	Okay
12:19	the-kenny	a_strange_guy: Clojure completions are either based on "simple" expansion of buffer contents or based on reflection of the clojure api.
12:20	a_strange_guy	so it looks up the current vars?
12:20	the-kenny	a_strange_guy: Yes, it detects all the contents of the current namespace.
12:20	the-kenny	a_strange_guy: It also supports fuzzy completion: "skeys" expands to "select-keys"
12:21	a_strange_guy	does that also work for java Classes and calls?
12:21	a_strange_guy	i'm trying to make java scriptable
12:21	the-kenny	hm.. I'm not sure
12:22	the-kenny	a_strange_guy: Looks like it works for imported classes, but not for their methods
12:23	the-kenny	a_strange_guy: Shouldn't be very hard to implement.. maybe I'll give it a try someday
12:24	a_strange_guy	the-kenny: do you have any good links for setting up emacs+slime on linux
12:24	proppy	Hi, how do I install package from clojars ?
12:27	proppy	ah got it I should create a skeleton project first
12:27	the-kenny	a_strange_guy: Yeah, the readme. It covers anything clojure-specific. A tutorial for emacs is included in emacs
12:27	the-kenny	C-h t or so
12:30	the-kenny	(C-h t means: Hold ctrl, press h, release ctrl and press t
12:30	the-kenny	+)
12:34	alexyk	chouser: any better idea how built-in sort-by beats a Schwarzian transform?
12:51	chouser	alexyk: nope. It's a HotSpot Christmas Miracle!
12:52	chouser	afaict, there's no way as it's written for the java routine that actually does the sorting to know avoid calling the keyfn twice for every comparison
12:53	chouser	and the way I wrote it, which should do a very fast transform once before and once after a simpler sort doesn't go any faster.
12:53	alexyk	chouser: we'll take such miracles any day, and twice for xmas! :)
12:53	chouser	I haven't profiled mine. Perhaps I'm doing something dumb that's slowing it down.
12:58	jweiss	if i want to truly treat code as data - let's say i want to generate new fns using an existing fn as a template (but i can't change the original fn). i know there's the "source" fn to use in a macro to get the code of the original fn, but it doesn't work in a repl. is there another way?
12:59	devlinsf	jweiss: What exactly are you trying to do?
13:00	Chousuke	the source function is not a reliable way to get the function source
13:00	jweiss	devlinsf: I want to use existing fns as a template, keeping the original fn as-is (as readable as it was before), and create new "patched" fns from it
13:00	Chousuke	it's just a quick and dirty repl tool :)
13:00	devlinsf	Ah
13:00	jweiss	Chousuke: is there another way?
13:00	Chousuke	no.
13:01	Chousuke	the source of a function is not stored anywhere after the function is defined.
13:01	Chousuke	unless you use a custom macro I guess.
13:01	devlinsf	Is the "Patch" easy to encapsulate in a fn?
13:01	jweiss	yeah, i realize i could make all my fns macros, but that sounds like a bad idea to me
13:02	Chousuke	no I mean, a custom macro for defining the fns
13:02	the-kenny	jweiss: You could create a new macro based on defn: defn-source or so.
13:02	Chousuke	instead of defn.
13:02	devlinsf	Try writing it as a higher order function
13:02	jweiss	oh i see
13:02	Chousuke	but yeah, I think a higher-order function would be the most idiomatic approach :/
13:02	jweiss	i'm not sure what that means
13:02	jweiss	write what as a higher order fn
13:03	devlinsf	jweiss: can you post your fn & a "patched" version?
13:03	jweiss	ok
13:03	devlinsf	Like, on the group or lisppaste?
13:04	jweiss	(defn myproc [] (print "a") (print "b")) -> (defn myproc2 [] (println "hello") (print "b"))
13:04	devlinsf	Ah
13:04	jweiss	i just want to replace one of the forms. i'm ok with marking the form somehow
13:04	devlinsf	Does your fn have side affects?
13:04	jweiss	devlinsf: yes
13:04	devlinsf	Ah. I vote for a macro
13:05	jweiss	devlinsf: how would i do that
13:05	Shantanu	hi all
13:05	jweiss	the macro won't have access to the original forms of the fn
13:05	devlinsf	Well... wait a sec
13:05	Shantanu	can anybody tell me a Maven2 repo for Clojure 1.1 RC ?
13:06	devlinsf	,(let [myproc-2 (fn [f] (f "a") (f "b))] (myproc-2 print))
13:06	clojurebot	EOF while reading string
13:07	devlinsf	,(let [myproc-2 (fn [f] (f "a") (f "b"))] (myproc-2 print))
13:07	clojurebot	ab
13:07	devlinsf	,(let [myproc-2 (fn [f] (f "a") (f "b"))] (myproc-2 println))
13:07	clojurebot	a b
13:07	devlinsf	Notice that myproc-2 takes a fn as an argumet
13:07	devlinsf	argument
13:08	devlinsf	That's called a higher-order fn
13:08	jweiss	devlinsf: yeah, but that's too simplistic, my real examples won't be using the same arguments either
13:08	devlinsf	Well, can you post the real deal?
13:09	jweiss	devlinsf: i'll have to think of an example that clojurebot can evaluate
13:09	devlinsf	Nah, just use lisppaste
13:09	jweiss	but basically i want to be able to replace (print "b") with ANY form
13:09	devlinsf	http://paste.lisp.org/new/clojure
13:10	devlinsf	Any form? Hmmm... maybe you want to use clojure.template?
13:10	jweiss	i want a way to tell clojure "this new fn is just like the old one, but replace this form with this one"
13:10	devlinsf	That's custom macro teritory
13:10	devlinsf	As in (defmacro defmycustom...)
13:12	jweiss	hm templates seems to be somethnig i could make use of
13:12	Shantanu	(Repeat question) Can anybody tell me a Maven2 repo for Clojure 1.1 RC ?
13:15	devlinsf	Shantanu: Here's Rich's post
13:15	devlinsf	http://groups.google.com/group/clojure/browse_thread/thread/24b9745199afbd89#
13:15	devlinsf	Shantanu: No mention of maven, though :(
13:16	Shantanu	devlinsf: Thanks, i guess i would use a local copy for a while until 1.1 arrives in th Maven repo
13:17	devlinsf	Shantanu: Yeah, sorry. Mention this on the group. I know Rich is interrested in having Maven work
13:17	Shantanu	devlinsf: I was expecting clojars.org to have it at least, but no luck there :-(
13:18	Shantanu	devlinsf: I will
13:19	devlinsf	jweiss: If clojure.template solves you problem, could you post your experience to the list?
13:20	jweiss	devlinsf: well, it won't solve the problem by itself, that's for sure. biggest hurdle right now is keeping the source of the original fn somewhere as data. which Chousuke pointed out i might do with a customized defn-like macro
13:20	the-kenny	4Isn't the one from build.clojure.org usable in maven?
13:21	jweiss	but it would be nice if the language did this for me
13:21	jweiss	i guess it's pretty rare that someone would want that
13:22	devlinsf	jweiss: Do you really need to keep the source? Could you provide a list of symbols & custom forms, and def everything at once?
13:22	jweiss	devlinsf: i probably could, i'm just worried the resulting code would be pretty unreadable.
13:23	devlinsf	That's where the template comes in... hmmmm...
13:24	the-kenny	Maybe a (binding) is possible to
13:24	the-kenny	Something like a macro which does bindings according to some table where the changed symbols are kept
13:25	abedra	is there an easy way to make the return of a function into a regex pattern?
13:26	abedra	e.g i have a function "delimiter" that decides what a string delimiter is
13:26	the-kenny	abedra: (re-pattern your-string)
13:26	abedra	and i want to take the return of that and just call re-split (delimiter foo)
13:27	abedra	thanks
13:27	abedra	i think that will do it
13:32	devlinsf	jweiss: You totally want clojure.template :)
13:34	devlinsf	jweiss: Check this out http://gist.github.com/260186
15:06	devlinsf	chouser: ping
15:07	chouser	devlinsf: hi
15:07	devlinsf	chouser: Just saw your comment
15:08	devlinsf	chouser: I used the exact same filename. Was that bad form?
15:08	chouser	hm... I thought I checked for that.
15:08	devlinsf	chouser: lemme check too
15:09	devlinsf	chouser: Yeah, the file is attached to the ticket.
15:09	devlinsf	chouser: It has the changes in it.
15:10	chouser	ohhh, I see.
15:11	chouser	you've got the previous patch in there too, adding the 2-arg withMeta, and then removing it again.
15:12	devlinsf	Yeah
15:12	devlinsf	Is that a problem
15:12	devlinsf	?
15:15	devlinsf	chouser: I did everything in the same branch. Still learning git
15:15	chouser	well, it's probably less good.
15:16	chouser	same branch is a matter of personal preference. The generated patch is fine either way.
15:17	devlinsf	okay. I'll keep that in mind next time
15:17	chouser	I should say, rhickey hasn't provided firm direction on most of this, so all I can give is my own opinion.
15:17	chouser	I'd genereally try to keep the diff itself as small as possible -- less for people to review.
15:18	chouser	so deleting unreleated commented-code, for example, I'd generally avoid.
15:19	devlinsf	Right, I can see that
15:19	chouser	and including code in one commit that's deleted in the next, all in one patch, can also be confusing.
15:20	chouser	Your fix, in the end, is just replacing two lines and adding some tests. It'd be nice if that's all that shows up in the diff.
15:21	devlinsf	Right.
15:21	devlinsf	Resubmit or leave it?
15:21	chouser	I can do it if you don't want to.
15:22	devlinsf	Only if it's quick. Don't want to eat up too much of your time on this issue
15:23	chouser	sure, I'll do it.
15:23	Chousuke	squashing commits is pretty easy with git.
15:24	devlinsf	Cool
15:26	chouser	oh, shoot, I should have included your tests.
15:27	devlinsf	chouser: What about the java comments I added above empty?
15:27	devlinsf	Do they make the next guy's job easier?
15:31	chouser	good question
15:31	devlinsf	I don't follow Rich's style here (because that was causing the bug)
15:33	chouser	what do you mean?
15:33	devlinsf	Well, Rich uses a static field EMPTY to generate empty each time
15:34	chouser	oh, right. but avoiding the use of EMPTY is used elsewhere in that same file for the same reason.
15:34	devlinsf	He calls EMPTY.withMeta(meta())
15:35	devlinsf	Not always. Look at create(items)
15:36	devlinsf	Anyway, this departs from the way things are done in the rest of Clojure
15:36	devlinsf	Hence, the /** java commets*/ Are probably a good idea. Javadoc will pick those up, too.
15:37	devlinsf	That's what I was thinking when I put them in.
15:39	hiredman	withMeta :(
15:43	chouser	devlinsf: Sometimes it's appropriate for comments to describe an alternate way something could be implemented and explain why it isn't, but I think those cases are pretty rare.
15:43	chouser	hiredman: what's wrong with withMeta?
15:44	devlinsf	chouser: Okay, cool. I guess the tests will prevent regression, so this should be fine.
15:44	hiredman	it replaces the map with another map, which leads to multiple functions that muck with metadata stepping on each other's feet
15:45	devlinsf	metdata is persistent
15:45	devlinsf	hiredman: I had your reaction initially
15:46	hiredman	for example, zippers store stuff in metadata
15:46	hiredman	(-> some-zipper some-function-which-naively-uses-withmeta zip/node) ;BOOM
15:47	hiredman	better to use vary-meta or similar where possible
15:48	devlinsf	hiredman: can you reproduce the bug?
15:48	hiredman	,(use 'clojure.zip)
15:48	clojurebot	java.lang.IllegalStateException: next already refers to: #'clojure.core/next in namespace: sandbox
15:48	hiredman	,(require '[clojure.zip :as zip])
15:48	clojurebot	nil
15:49	hiredman	,(-> '(1 2 3) zip/seq-zip)
15:49	clojurebot	[(1 2 3) nil]
15:49	hiredman	,(-> '(1 2 3) zip/seq-zip (with-meta {}) zip/node)
15:49	clojurebot	(1 2 3)
15:49	hiredman	gah
15:49	hiredman	,(-> '(1 2 3) zip/seq-zip meta)
15:49	clojurebot	{:zip/branch? #<core$seq_QMARK___4482 clojure.core$seq_QMARK___4482@1b53c44>, :zip/children #<core$identity__4959 clojure.core$identity__4959@1cf287e>, :zip/make-node #<zip$seq_zip__8135$fn__8137 clojure.zip$seq_zip__8135$fn__8137@7173bf>}
15:50	hiredman	,(-> '(1 2 3) zip/seq-zip zip/down meta)
15:50	clojurebot	{:zip/branch? #<core$seq_QMARK___4482 clojure.core$seq_QMARK___4482@1b53c44>, :zip/children #<core$identity__4959 clojure.core$identity__4959@1cf287e>, :zip/make-node #<zip$seq_zip__8135$fn__8137 clojure.zip$seq_zip__8135$fn__8137@1808c77>}
15:51	hiredman	gah
15:51	hiredman	ok, zippers don't work exactly like I thought
15:51	hiredman	but the metadata thing is still an issue
15:52	chouser	vary-meta is build on withMeta()
15:52	slashus2	Is there a good tutorial on using zippers? The only ones I see are in Haskell.
15:52	hiredman	chouser: sure
15:53	hiredman	I'm not saying withmeta is horrible, I am saying using it without regard for what metadata might already exist is bad
15:53	chouser	yes, true.
15:54	chouser	brb
16:18	the-kenny	If I use swap on an atom, is the supplied function f retried when another thread has changed the value?
16:18	the-kenny	*value of the atom
16:22	Chousuke	the operation is atomic, so yes.
17:17	rads	anyone know why when I do `lein swank` I get "Could not find clojure.main. Make sure you have it in your classpath"?
17:18	the-kenny	rads: Try running lein deps first
17:22	rads	the-kenny
17:22	rads	er, that worked, thanks
17:22	the-kenny	You're welcome
17:26	rads	when I do M-x slime-connect it seems to connect fine, but no REPL pops up
17:50	the-kenny	Interesting blog post about tail call optimization in the jvm: http://weblogs.java.net/blog/forax/archive/2009/12/18/tailcall-anyone
17:52	hiredman	I can't figure out how to emit the wide bytecode withe the asm lib bundled with cojure
17:52	alexyk	liebke: ping
17:53	liebke	alexyk: hey
17:53	alexyk	couple questions: if I want to contribute, e.g. the clustered scatter-plot, where should I add it in a fork?
17:53	alexyk	or, rather, preprocessing of xy's to compressed xy's
17:54	liebke	ah, good question
17:55	liebke	what about transformations
17:55	alexyk	ok
17:55	alexyk	at top level?
17:55	liebke	yeah
17:56	alexyk	so, src/main/clojure/incanter/transformations.clj?
17:56	liebke	yep
17:57	alexyk	ok. Another problem: when I chart from remote server via X, (use '[incanter ...]) inits the local X on my MacBook. From that moment on, if MBP goes to sleep, that kills remote X server and the clojure repl, with gigs of painfully loaded data.
17:58	liebke	hmmm
17:58	alexyk	So I'm stuffing it all back into Mongo, thank G-d for that. But is there a way to unload incanter after plotting, or disconnect from X, or something?
17:59	liebke	good question, but I don't have an answer
17:59	the-kenny	hm.. I will give mongodb a try
17:59	liebke	if you figure out a fix, let me know
18:00	alexyk	I tunnel X via ssh -X or ssh -Y. In general, I think it's a common setup for data mining on big boxes remotely, so would be good to find a way to be able to suspend clients without killing servers.
18:00	the-kenny	Fast: Best mongodb-lib for clojure
18:00	alexyk	the-kenny: congomongo
18:00	liebke	yeah, I use ssh -X myself
18:01	alexyk	liebke: did you experience this server quitting?
18:01	liebke	I haven't run into the problem yet, but it doesn't mean I won't
18:03	hiredman	the issue is really with the X protocol, your best bet is just not to let your laptop go to sleep
18:04	Anniepoo	question for all - I'm needing to do a fuzzy word match. Anybody here with any experience with such?
18:04	hiredman	you might try using some kind of vnc instead of tunneling x11
18:04	hiredman	x2vnc or something
18:05	liebke	hiredman: hmm, interesting idea. I guess it's good to know about this problem with x11
18:07	thearthur	whats the functions to return true if any member of a collection matches a predicate?
18:07	hiredman	putting the laptop to sleep will kill the X connection, and the x archtecture makes it not, uh, "restartable"
18:07	hiredman	some
18:09	thearthur	hiredman, thanks, had my brain stuck on any?
18:10	gravity	There are programs that will act as the equivalent of "screen" for X11. I don't know if they'll work for OSX though, but it's worth a look
18:10	hiredman	really? I guess I shouldn't be surprised
18:10	liebke	gravity: thanks, I'll have to look for one
18:11	gravity	http://www.insanelymac.com/forum/index.php?showtopic=80076 lists mac-specific options (xmove)
18:12	alexyk	hiredman: interesting
18:12	liebke	gravity: cool thanks
18:12	gravity	np
18:27	the-kenny	mh.. congomongo looks so... big and ugly compared to clojure-couchdb
18:34	jasapp	the-kenny: how so?
18:35	qed	http://blog.labnotes.org/2009/12/19/all-your-maven-are-belong-to-us/
18:35	qed	interesting stuff
18:35	jasapp	I've been using congomongo, but haven't used couchdb at all
18:36	the-kenny	jasapp: I think it's because the interface to couchdb is much simpler (just http).
18:37	jasapp	ahh
18:38	somnium	writing BSON encoders for tcp/ip is definitely a PITA
18:39	the-kenny	Oh sorry somnium, I didn't want to decry your work.
18:39	somnium	the-kenny: shrug Ive been wrapping the java driver
18:40	jasapp	did you have any ideas on doing the map reduce stuff, or the sorting?
18:40	jasapp	somnium, for congomongo?
18:40	jasapp	I've got some time over the next few weeks, and I wouldn't mind hacking on it some.
18:40	somnium	jasapp: yes, the biggest obstacle is the java driver
18:41	jasapp	I guess I haven't looked at the java part too closely
18:41	jasapp	what's limiting?
18:41	somnium	jasapp: the encoding, its in Bytes or one of the subclasses
18:42	somnium	ah, for map-reduce etc, its mostly there in the java driver
18:43	jasapp	is there anyway to write map reduce functions in clojure, instead of js?
18:43	jasapp	short of using the clojure to js translator
18:44	somnium	jasapp: have to gen js somehow
18:44	the-kenny	there are two clojure -> js libs I'm aware of
18:45	somnium	Im working on one with basic support for TCO and clojureish semantics
18:45	jasapp	cool
18:46	somnium	maybe just alter the prototype for array and object to support seq could work
18:47	somnium	but clojure encoders would mean sorted-maps, hash-sets, whatever could be stored in mongo with great performance
18:48	jasapp	if there is anything I can help with, please let me know
18:48	somnium	jasapp: if working on a tcp/ip BSON client sounds like a fun project... (hint hint)
18:48	jasapp	hmm, I might be interested in tackling that
18:49	jasapp	so you avoid using the java drivers completely?
18:50	somnium	yeah, the main issue is performance
18:51	somnium	but right now some work is being repeated, so deftype based clojure encoders should be equivalent if not faster
18:52	jasapp	I'll take a look at bson and see if it's something I can handle
18:53	somnium	its bit twiddling the byte buffers where Im mostly clueless
18:53	jasapp	someone mentioned on here the other day that clojure was particularly slow when it cames to bits
18:54	jasapp	I think that's maybe fixed in 1.1 though
18:55	somnium	hopefully byte arrays are pretty fast
18:56	somnium	the driver uses os-streams through java.nio
19:03	_ato	jasapp: bit-twiddling and arithmatic in Clojure should be no slower than Java as long as you are careful about it and use appropriate casts to avoid boxing.
19:04	jasapp	_ato: thanks for the info
19:04	jasapp	I wish I could remember who said that, and what exactly they said
19:04	jasapp	does clojurebot keep a log?
19:05	the-kenny	jasapp: Yes
19:05	somnium	maybe the bit-shift operators?
19:05	the-kenny	clojurebot: logs
19:05	clojurebot	logs is http://clojure-log.n01se.net/
19:05	_ato	it could be because the bit-shift operators are java function ca
19:05	_ato	lls
19:05	_ato	but I would have thought hotspot would inline them anyway
19:08	somnium	hmm, bit-and calls out to clojure.lang.Numbers, do they get boxed on the way?
19:08	_ato	~def bit-shift-right
19:08	_ato	hmm
19:08	_ato	you're right
19:08	_ato	that's worrying
19:08	_ato	since they're wrapped in Clojure functions without inlines that's going to be forcing boxing
19:09	somnium	jasapp: the encoders just need to bash on ByteBuffers, no actual bit-twiddling needed
19:10	jasapp	alright
19:10	_ato	bit-not, bit-or etc have inlines, just looks like set, test and shifts are missing them
19:11	somnium	ive only ever used bit-twiddling on euler problems :/
19:11	hbock	has anyone attempted to run clojure on an embedded JVM, e.g., Squawk?
19:12	the-kenny	hbock: I've not.. but I would like to see it running on the lejos-jvm :)
19:12	hiredman	a lot of that stuff doesn't use "modern" jvms
19:13	hiredman	e.g. 1.5 or later
19:13	hbock	the-kenny: interesting.
19:13	_ato	hbock: it works in jamvm, it's kind of slow though
19:13	hiredman	squawk is j2me which is 1.4
19:13	hiredman	so no dice
19:13	hbock	:(
19:13	hbock	damn.
19:13	hbock	FIRST robotics is using the Squawk JVM
19:14	hbock	we were hoping to get clojure running on our bot.
19:15	hiredman	hbock: I could be wrong, there might be some kind of j2me that is 1.5+
19:15	hiredman	(not as far as I can tell though)
19:16	hiredman	~maxine
19:16	clojurebot	Titim gan éirí ort.
19:16	hiredman	clojurebot: maxine is http://research.sun.com/projects/maxine/
19:16	clojurebot	Roger.
19:19	notallama	so, would it count as writing a jvm in java if you wrote it in clojure?
19:21	hiredman	I'm not sure if maxine does a bytecode transform or a transform over source (to get the native bits)
19:22	hiredman	maybe asm could be reworked to emit some special bytecodes
19:22	hbock	hmm. newbie question: does paredit work without modification with clojure?
19:22	somnium	does hotspot completely rewrite the output from javac?
19:23	hiredman	somnium: eh?
19:24	somnium	I watched a talk a while back, and the gist I got was that hotspot undoes all of javac's optimizations and completely reoptimizes at runtime
19:25	hbock	ahh. looks like there's a clojure-paredit.el
19:26	hiredman	somnium: hotspot generally is about generating native code from bytecode
19:27	somnium	hiredman: it was yegge bashing on java/c++ I think, so some of it might have been hyperbole I guess
19:27	hiredman	it might not be
19:28	hiredman	but hotspot watches for hotspots and kicks in, so you have to do x executions before it kicks in
19:29	hiredman	x is generally on the order of 1000, I hear
19:29	chouser	somnium: I'm under the same impression, that hotspot decompiles what javac produces and then does its own optimizations.
19:29	somnium	http://www.youtube.com/watch?v=tz-Bb-D6teE
19:29	hiredman	so for the first 1000 you have only what javac gave you
19:30	somnium	it does make Foo foo = ((Foo)Foomaker.MakeFoo()) seem particularly silly
19:32	hiredman	that is purely a compiler issue
19:33	hiredman	while the bytecode is typed and you do casts and such, the compiler could be smarter and do inference, etc
19:35	lopex	javac doesnt do any optimizations
19:35	lopex	except for very obvious ones, like constant propagation for static finals
19:48	interferon	do lazy sequences do any kind of caching? if i evaluate the first 10 elements of a lazy sequence and then later ask for the first 20, will the first 10 be computed again?
19:48	somnium	interferon: if its the same lazy-seq it will be cached
19:49	somnium	,(doc lazy-seq)
19:49	clojurebot	"([& body]); Takes a body of expressions that returns an ISeq or nil, and yields a Seqable object that will invoke the body only the first time seq is called, and will cache the result and return it on all subsequent seq calls."
19:49	interferon	great. thanks.
19:58	alexyk	how do you refer to the whole pattern, e.g. fn [[k v]] -- how do you get [k v] back too?
19:59	somnium	,(let [[k v :as all] [1 2]] (list k v all))
19:59	clojurebot	(1 2 [1 2])
20:00	alexyk	ah
20:43	xochipil1i	fffffffffffffffffffffffff
20:43	xochipil1i	wtf
21:06	alexyk	somnium: can mongo do merges?
21:14	somnium	alexyk: like (merge {:a :b} {:c :d}) ?
21:14	alexyk	yeah, inside mongo
21:14	alexyk	before returning
21:15	alexyk	I have two big collections, same keys
21:15	alexyk	:user
21:15	somnium	alexyk: I dont know :/
21:16	somnium	try #mongodb?
21:16	alexyk	somnium: I have a sense it might... will ask mongo ppl
21:16	alexyk	yeah
21:17	somnium	my actual use of mongo so far has just been as a read-only fact-table
21:19	somnium	/join #mongodb
21:19	somnium	\join mongodb
21:19	somnium	sry
21:21	alexyk	,(count (second (first [[:a [1 2 3]] [:b [4 5]]]))) ; how do I use comp to get rid of some ()s?
21:21	clojurebot	3
21:22	chouser	,(->> [[:a [1 2 3]] [:b [4 5]]] first second count)
21:22	clojurebot	3
21:23	chouser	,((comp count second first) [[:a [1 2 3]] [:b [4 5]]])
21:23	clojurebot	3
21:23	alexyk	chouser: cool. But is comp applicable here too?
21:23	alexyk	ah yes
21:24	chouser	:-)
21:24	hiredman	:)
21:24	somnium	♥ ->>
21:43	devlinsf	quick git question
21:43	devlinsf	how do I "forget" all the changes since my last commit
21:45	dnolen	devlinsf: git reset --hard HEAD^
21:46	dnolen	remove --hard if you don't want to blow away the index
21:46	tolstoy	git --reset --har..... ah, yeah.
21:47	devlinsf	Works, thanks!