#clojure – 2010-07-21

2010-07-21

00:58	Bahman	Hi all!
01:04	technomancy	hello!
01:15	technomancy	who's at oscon?
01:40	cais2002	is clojure.contrib.io now clojure.java.io ?
01:41	mikem	cais2002: yes: http://www.assembla.com/spaces/clojure/tickets/311
01:42	cais2002	thanks, mike
01:56	konr	I'm building an interface using QT Jambi - it should work on Windows, right?
02:08	bortreb	is there any way to get rid of the explicit loop in this code? I'm trying to make it more idiomatic but I'm new to clojure --- http://gist.github.com/484131 thanks :)
02:15	talios	Home time. I'm outta here.
02:16	tomoj	bortreb: maybe it would be nicer to use a promise?
02:19	Raynes	Conjure looks cool.
02:35	bortreb	tomoj: use a promise instead of a future?
02:35	tomoj	instead of an atom
02:35	tomoj	something like this maybe? https://gist.github.com/7108adefc34f7ff2ea73
02:37	raek	bortreb: when a thread derefs a promise object, that thread will block until some other thread delivers a value
02:37	tomoj	derefing a promise will block until it's delivered
02:37	bortreb	tomoj: but what if the other future tries to deliver to the promise before it's future-canceled? wouldn't that throw an exception?
02:37	tomoj	so you can have the futures all compete to be first to deliver
02:37	tomoj	yeah, but do you care?
02:37	bortreb	nope! :)
02:37	tomoj	you won't get the exception in your thread
02:37	bortreb	so i could wrap it in try or something
02:38	tomoj	(right?)
02:38	tomoj	oh, maybe you would, I dunno
02:39	tomoj	seems not
02:40	raek	,(let [p (promise)] (deliver p :foo) (deliver p :bar)]
02:40	clojurebot	Unmatched delimiter: ]
02:40	raek	,(let [p (promise)] (deliver p :foo) (deliver p :bar))
02:40	clojurebot	java.lang.IllegalStateException: Multiple deliver calls to a promise
02:41	tomoj	,(let [p (promise) f (future (deliver p :foo) (deliver p :bar))] @p)
02:41	clojurebot	:foo
02:41	tomoj	the future blows up but doesn't matter, you've got the answer already :)
02:43	bortreb	that's real nice, I did some timing and it seems to be a little faster than the loop method!
02:45	tomoj	won't be spinning on derefing to check ::void
02:46	bortreb	thank you so much!
02:50	konr	how can I get a static field of a java object?
02:51	konr	oh, of course
03:33	neotyk	Hi #clojure!
03:34	neotyk	Yesterday I got an issue that returning vector of bytes is bad design
03:35	neotyk	That I should return ByteArrayOutputStream
03:36	neotyk	I have my doubts, BAOS is java object and you have to use additional tools to deal with it, while vec is native
03:36	neotyk	please advise.
03:37	raek	I guess that depends on what you are youing to do with it
03:38	neotyk	it is http client, and way to transfer body, or body parts, back to caller
03:39	neotyk	http://github.com/neotyk/ahc-clj/issues#issue/1
03:42	Kaali	Hi everyone, I'm trying to create a simple web form validation library. I'm getting an error from my macro which I don't understand: http://gist.github.com/484140 -- the error message from SLIME is in the comment.
03:45	neotyk	Kaali: have you tried macroexpand-1?
03:45	Kaali	Yes, and it seems ok in my eyes.
03:45	Kaali	The problem seems to be with the anonymous functions returned by transform, but they work fine when I run them in REPL.
03:46	Kaali	With macroexpand, the map fn ~validators# expands to the key-fn map as it should.
03:49	tomoj	neotyk: when i was looking at your library earlier today, I found it very odd that a vector of bytes was returned
03:51	tomoj	you're adding each byte one at a time onto that vector
03:51	tomoj	which seems like it would be pretty slow
03:52	tomoj	also consider cases where you don't want the whole response in memory at once
03:53	neotyk	tomoj: agree adding might be slow, disagree on whole resp in memory, as there is streaming api
03:54	neotyk	tomoj: so you would also be in favor of ByteArrayOutputStream?
03:54	tomoj	dunno about that
03:54	tomoj	all I really want is a string :)
03:55	neotyk	but if you're getting png, string will not work
03:55	tomoj	I'm not getting png
03:55	neotyk	lol
03:55	tomoj	(not suggesting String)
03:56	neotyk	helper function to extract string from responses body?
03:56	tomoj	I admit I did give up on your library when I saw the byte-at-a-time-into-vector thing
03:57	neotyk	tomoj: ok, this convinced me, moving out from byte vector to outputstream
03:58	neotyk	tomoj: would (string (:body @resp)) be user friendly enough?
03:58	tomoj	I'd personally be happy with that
03:59	neotyk	tomoj: can I come back to you for review round, once I have it fixed?
03:59	tomoj	I don't think I'll be able to offer much advice.. ByteArrayOutputStream scares me too
03:59	tomoj	my only input is that vector of bytes seemed wrong :)
04:00	tomoj	but I'll be here
04:00	neotyk	I can handle BAOS, would like you tell me if getting string is good :-)
04:01	neotyk	tomoj: thanks for been honest and your input, it is appreciated.
04:01	tomoj	hmm
04:01	tomoj	ByteArrayOutputStream can't be right, can it?
04:02	tomoj	I mean... it's an output stream
04:03	neotyk	tomoj: yes, should be ByteArrayInputStream
04:04	tomoj	btw, why'd you go with all-caps for GET/PUT/etc?
04:04	tomoj	just curious
04:04	tomoj	to avoid clobbering stuff in core?
04:19	neotyk	tomoj: it was named after http verbs, also is kind of counterpart of compojure
04:20	neotyk	and partly because core defines get already
04:27	rdsr	Has anyone received the following error when cloning a repo
04:27	rdsr	error: Unable to find bf17b72ec8320703015ba6509000cd20fed1fd0a under http://github.com/clojure/clojure-contrib.git
04:27	rdsr	Cannot obtain needed tree bf17b72ec8320703015ba6509000cd20fed1fd0a
04:27	bulters	gday...
04:28	tomoj	rdsr: nope
04:28	tomoj	just cloned clojure-contrib fresh, no problem
04:29	tomoj	old git?
04:29	rdsr	git version 1.6.2.2
04:33	rdsr	what's worse, its giving different errors on different retries, now it gives
04:33	rdsr	error: Unable to find 3e3c10a5dfe5d0e8db0094324e55dd14ccb98f8d under http://github.com/clojure/clojure-contrib.git
04:33	rdsr	Cannot obtain needed blob 3e3c10a5dfe5d0e8db0094324e55dd14ccb98f8d
04:33	rdsr	while processing commit e0080e640a2d9b79564a3fb6eb7ee36be1882901.
04:33	rdsr	fatal: Fetch failed.
04:37	Raynes	mmarczyk: Ping.
05:17	opqdonut	anyone else have problems with permgen filling up with clojure?
05:20	naeu	morning
05:21	AWizzArd	Hi naeu
05:21	naeu	is there an equivalent of subvec for lists?
05:21	naeu	I'm playing around with a basic implementation of quicksort
05:21	naeu	and I'm putting in a vector, which is then being split with subvec and then concatenated with concat
05:22	naeu	however, concat appears to return a list
05:22	naeu	which then faile
05:22	naeu	s/faile/fails
05:22	naeu	in the next recur as subvec needs a vector
05:22	AWizzArd	naeu: you could use a composition of take and nthrest
05:23	naeu	AWizzArd: interesting, i've not seen nthrest before
05:52	lozh	,(vec (concat [1 2 3] [2 3 4]))
05:52	clojurebot	[1 2 3 2 3 4]
05:59	cais2002	how do I instruct leningen to ignore some files when creating the jar file?
06:09	Raynes	Why does shuffle return a vector?
06:12	lozh	Raynes: I guess it depends on having a reasonably performant nth implementation
06:14	Raynes	There should probably be a slower list option. :\
06:14	Raynes	It's kind of screwing with me now.
06:17	lozh	shuffle just delegates to java.util.Collections.shuffle might be able to adapt it
06:18	lozh	,(seq (shuffle [1 2 3]))
06:18	clojurebot	(2 3 1)
06:23	dsop	,(clojure-version)
06:23	clojurebot	"1.2.0-master-SNAPSHOT"
06:24	dsop	,(partition-all 5 [104 104])
06:24	clojurebot	((104 104))
06:25	lozh	Raynes: shuffle-to-list @ http://clojure.pastebin.com/8rKpGYfW
06:26	Raynes	(into '() ..) also works. :p
08:35	brweber2	any ideas how to submit a ticket via assembla? There is no create button on the tickets page....
08:36	raek	brweber2: if you aren't a contributor, you can create a ticket at the support tab: http://www.assembla.com/spaces/clojure/support/tickets
08:37	raek	I think you need to create an account, though
08:38	raek	but being a watcher of the project is enough to create tickets
08:38	brweber2	raek Even on that page, there is no button/link to create a ticket, sounds like I need more permission?
08:39	raek	brweber2: are you watching the space?
08:39	raek	the new ticket is there once you have logged in
08:39	brweber2	raek Thought I was b/c it showed up in 'My Start Page' but turns out I wasn't! Fixed now, thanks.
08:39	raek	s/new ticket/new ticket button/
08:39	sexpbot	the new ticket button is there once you have logged in
08:40	raek	I really wish rhickey would check the CA post box soon
08:41	raek	I have two really anoying bugs I want to fix
08:41	opqdonut	how much does 1.2 break at the moment?
08:42	opqdonut	is its performance any better?
08:42	Raynes	I'm pretty sure it's source compatible with 1.1.
08:42	opqdonut	our code is spending 23% execution time in isInstance...
08:47	lozh	What are you using to get the performance profile?
08:50	opqdonut	yourkit
11:42	lpetit	Hi,
11:48	rubydiamond	to buy kindle dx or not
11:49	nDuff	rubydiamond, I gave you my advice already.
11:50	esj	hey lpetit
11:50	nDuff	rubydiamond, ...if your goal is to read the Joy of Clojure or other content from Manning, it works well for the task.
11:50	rubydiamond	nDuff: heh
11:50	rubydiamond	yes
11:50	rubydiamond	nDuff: I had ordered it and it got returned back to shipper due to my absense
11:51	technomancy	it's great for public domain books as well; that's all I use mine for
11:51	technomancy	but you don't need the DX for that
11:51	lpetit	esj: hey !
11:52	rubydiamond	technomancy: what do you mean by you don't need DX for that
11:53	technomancy	rubydiamond: well the point of a DX is that the page layout is kind of close to what you'd see in a paper book... so if you've got a carefully-crafted PDF with diagrams and such, it helps
11:54	technomancy	but for just reading text, there's no advantage of having the larger model
11:54	lpetit	ccw users, like it or not, but the next release candidate will embark with an even more automatic mode :-) (I've not yet started to implement the result of the lessons learned from the ml thread)
11:55	rubydiamond	technomancy: so do you recommend Kindle 2?
11:55	technomancy	rubydiamond: I recommend the Kindle 1 actually
11:55	rubydiamond	haha .. ?
11:55	rubydiamond	technomancy: why?
11:55	technomancy	I hate how they dropped the analog place-ribbon
11:55	technomancy	they moved all the UI feedback to the screen, and the screen has a lousy refresh rate
11:56	lpetit	don't panic: in fact it will be a correction of a bug: currently, when you start a REPL (I should say launch a clojure environment via clojure.main), nobody is loaded by default. And as soon as you save any file, everything in the project is loaded. This was somehow inconsistent. With the bug corrected, a new launch wil automatically trigger the load of the project, without waiting for a...
11:56	lpetit	...first save
11:56	technomancy	with the Kindle 1, you could get faster feedback on what you were selecting that wasn't rate-limited by the crap refresh rate
11:56	rubydiamond	technomancy: do you have kindle 2 or 1?
11:56	technomancy	plus it had an analog scroll wheel instead of a d-pad, which is much nicer
11:56	technomancy	rubydiamond: I have the v1
11:56	technomancy	rubydiamond: plus it supports SD-cards
11:57	technomancy	the only advantage of the v2 is the 15%-ish faster refresh rate
11:57	rubydiamond	technomancy: okay.. but is Kindle 2 device worth buying?
11:58	technomancy	rubydiamond: sure, as long as you're not paying more for it than you'd pay for a v1
11:58	technomancy	just don't buy any books from amazon
11:58	rubydiamond	technomancy: yeah.. also how many books you have read on your kindle 1?
11:58	rubydiamond	and how many tech books ? :p
11:58	technomancy	probably 30-40 books; maybe 5 tech books
11:59	technomancy	the code samples in tech books are hard to read on the smaller screen
12:00	rubydiamond	aw.. but technomancy, do you think that it's bad thing?
12:04	technomancy	depends on the book... some rely on code more than others
12:05	rubydiamond	okay.
12:05	rubydiamond	technomancy: do you think kindle 2 is must have device?
12:06	lpetit	rubydiamond: by looking at the characteristics of the different models from the wikipedia page, seems like Kindle DX International 2 is what I would buy, would I buy one of these devices
12:07	rubydiamond	hmm
12:07	rubydiamond	confused..
12:07	technomancy	rubydiamond: it's great for people who like to read, especially those who like to read books that are out of copyright
12:07	lpetit	http://en.wikipedia.org/wiki/Amazon_Kindle#Kindle_DX_International_2
12:07	technomancy	rubydiamond: I can't recommend the Amazon book store, but for reading content from feedbooks.com etc. it's absolutely fantastic.
12:08	rubydiamond	$379 > $189 I think I would go for Kindle 2 .. and not DX..
12:08	technomancy	and with tech publishers it varies; some of them are good about releasing DRM-free ebooks and some are not. oreilly and the prags are the best.
12:09	rubydiamond	I am hoping that I would be able read tech pdfs I have (10+ in my pool)
12:09	lpetit	rubydiamond: I understand, but I'm not a frenetic consumer, and when I spend money, I prefer to spend more money on something that will make me the most happy for the most time
12:10	technomancy	rubydiamond: ah, actually I realized the Kindle 2 does have one other advantage over v1; it supports PDFs natively
12:10	rubydiamond	lpetit: I think same.. but as technomancy said .. less size is better for mobility
12:10	technomancy	the v1 has to go through a manual conversion process. so I don't know how PDFs look on v2
12:10	rubydiamond	technomancy: yeah
12:10	rubydiamond	technomancy: hmm
12:11	technomancy	but... there's still no way you could show some of the code samples without line-wraps
12:11	rubydiamond	the only missing information I have is that how people find reading pdfs on Kindle 2
12:11	rubydiamond	:)
12:12	lpetit	rubydiamond, technomancy: I understand the less size argument, but I fear that it would somehow decrease the pleasure to read, because currently most formats still respect US / A4 and thus either the page will be reduced, either you will not be able to see one page at once
12:13	technomancy	also depends on where you're planning on reading it. if you have a long commute each day you'd need something smaller vs reading on the couch at home.
12:14	lpetit	sure
12:14	rubydiamond	http://upload.wikimedia.org/wikipedia/commons/0/0b/Kindle_DX_Front.jpg vs http://upload.wikimedia.org/wikipedia/commons/d/d7/Kindle_2_-_Front.jpg
12:14	lpetit	and the kindle dx is approximately the same size and price of an iPad, hmmmm
12:15	rubydiamond	lpetit: yeah
12:15	rubydiamond	that's what I am thinking bad about it .. I think i would never click 'confirm payment' button for dx
12:16	rubydiamond	looks like I am going to buy Kindle 2
12:16	lpetit	rubydiamond: your 2 screen shots convinced me that I'm not yet ready to read on these devices unless needed. So maybe yes, I also may choose the smallest one after all, and use it only when forced to
12:17	technomancy	those photos make it look blurry; it's actually very crisp.
12:17	rubydiamond	lpetit: why when forced..
12:17	lpetit	rubydiamond: 'cause I'm still considering that they are poor replacements for POBs.
12:17	lpetit	Plain Old Books
12:18	rubydiamond	lpetit: that's true.. but when you are commuting or waiting state.. you don't have POB with you most of time
12:18	dakrone	lpetit: if you travel with books, a kindle is amazing
12:18	technomancy	lpetit: you should see how easy it is to get new content from feedbooks on the Kindle
12:18	dakrone	took mine to Europe, so much better than a suitcase full of books
12:18	technomancy	lpetit: you think to yourself, "I want to read Sherlock Holmes" and 30 seconds later it's in your hand.
12:19	rubydiamond	I spend time when I am waiting for somebody .. that time I could just open up my bad and start reading books .. like Joy of Clojure on my Kindle
12:19	lpetit	pain of taking notes, no colors yet, you can't jump with your fingers from one page to the other, bad support for "visual memory", etc.
12:19	rubydiamond	dakrone: kindle 2 or dx?
12:19	dakrone	rubydiamond: kindle 2
12:20	lpetit	dakrone: granted, but still seens as a "plan B" for when travelling
12:20	dakrone	it's not a replacement for physical books, but it still quite nice
12:21	dakrone	put stuff on instapaper, put your instapaper on your kindle
12:21	rubydiamond	dakrone: how is for reading tech pdfs?
12:22	lpetit	technomancy: is it a real feature, or a gadget feature ? Having the book quickly is now easy, reading it not so (or do you have the same learning machine as is used in Matrix ? :-) )
12:22	dakrone	rubydiamond: I've read the Practical Clojure book on it with no problems. I also read a lot of tech whitepapers without too much trouble
12:22	dakrone	if you have bad eyes or like large text, it will be harder
12:22	lpetit	rubydiamond: I almost always have a bag with my laptop and a book in it :-)
12:22	rubydiamond	dakrone: can't I just zoom text on pdf?
12:23	lpetit	rubydiamond: a good muscle exercise, for us who sit behind a desktop all day long :)
12:23	technomancy	lpetit: I'm just saying I have read significantly more fiction since getting a kindle
12:23	dakrone	rubydiamond: yea, you can. If it's a text/azw/html document though, when the text is large the wrapping can make code snippets hard to read
12:23	lpetit	technomancy: now that's interesting
12:24	dakrone	but that's only if you use a large text size
12:24	rubydiamond	dakrone: you mean I can't zoom for pdf .. that's not good news
12:24	technomancy	YMMV of course. =)
12:24	dakrone	rubydiamond: no, you can zoom for pdf
12:24	rubydiamond	dakrone: then I can just zoom and read
12:24	rubydiamond	:)
12:24	dakrone	rubydiamond: yep
12:25	dakrone	plus, super-basic web browsing for emergencies ;)
12:25	lpetit	I make a difference between books from which there is something to be learned, to which one will want to come back (and make his "sensorial" / "visual" memory work), from fiction book you will rarely ever re-read again
12:25	technomancy	lpetit: yes, the kindle is terrible for reference materials
12:25	technomancy	if it's something you want to come back to and page through
12:25	lpetit	technomancy: forgive my bad english: terrible with the "very bad" meaning ?
12:26	technomancy	right
12:26	rubydiamond	:(
12:26	rubydiamond	that's my use case .. reading lots of tech pdfs ..
12:27	dakrone	rubydiamond: how do you normally study/read tech stuff?
12:27	technomancy	rubydiamond: well there are different kind of tech books
12:27	dakrone	do you take notes? highlight?
12:27	technomancy	some are meant for a linear read, while others are meant for a more "cookbook" style of reading
12:27	rubydiamond	dakrone: I normal read physical tech books.. I also read pdfs on macbook pro
12:27	lpetit	do you have a more "visual" than "auditive" memory ?
12:28	rubydiamond	I have purchased 10+ tech books in last year .. I never completed reading my tech pdfs..
12:28	lpetit	that's a sign ...
12:30	dakrone	rubydiamond: do you normally just read through them, or do you take notes and/or highlight as you go?
12:30	dakrone	do you use margins in books?
12:30	lpetit	not trying to prevent you from consuming, but setting the expectations at the right level helps not being disappointed
12:31	dakrone	if you want to see how a particular PDF looks, I suppose I could load it up and take a picture of the kindle for you if that would help
12:33	rubydiamond	got disconnected..
12:33	rubydiamond	did I miss something
12:34	dakrone	rubydiamond: if you want to see how a particular pdf looks, I offered to load it up on mine and take a picture if that would help
12:34	rubydiamond	dakrone: yea it would definitely help
12:35	dakrone	rubydiamond: do you have a PDF you want to see?
12:35	rubydiamond	you can use practical clojure / joy of clojure
12:36	technomancy	I wonder how Practical Clojure would sell if they had actually promoted it before it came out.
12:37	rubydiamond	I am wondering how Jay Fields and Uncle Bob are liking and loving Clojure
12:37	rubydiamond	both are icons..
12:37	dakrone	rubydiamond: the only clojure book I own is _Programming Clojure_, that okay?
12:37	rubydiamond	dakrone: yeah okay..
12:37	rubydiamond	:)
12:40	lpetit	rubydiamond: First time I'm hearing of Jay Fields, that okay ? :)
12:41	rubydiamond	lpetit: not very okay.. if you are online for last 5-6 years and following programming things..
12:41	rubydiamond	lpetit: http://blog.jayfields.com/
12:41	lpetit	'cmon
12:42	slyrus	what's the conventional leiningen layout for test code myproject/test or myproject/src/test?
12:43	rubydiamond	dakrone: waiting for your pic.. :)
12:44	tomoj	anyone successfully installed clojure-test-mode from elpa lately?
12:44	dakrone	rubydiamond: takes time, hold on :)
12:44	technomancy	tomoj: there are problems using the stock package.el; try my patched version: http://p.hagelb.org/package.el
12:44	tomoj	technomancy: thanks
12:44	lpetit	must leave, bye guys
12:48	dakrone	rubydiamond: http://imgur.com/oYBvd.jpg http://imgur.com/Z6o01.jpg http://imgur.com/GsG6N.jpg http://imgur.com/Vqd9n.jpg
12:48	Lajla	,(let [large + black 1 phallic 2 cock 3] (large black phallic cock))
12:48	clojurebot	6
12:49	dakrone	excuse the poor quality, it's a phone camera
12:49	technomancy	dammit, what happened to my /ignore list
12:49	rubydiamond	dakrone: checking
12:52	rubydiamond	dakrone: have you zoomed the text in later screenshots
12:52	dakrone	rubydiamond: yea, 150%
12:53	rubydiamond	dakrone: okay..
12:53	rubydiamond	text looks good when zoomed... but not for 100% size
12:53	rubydiamond	but that's fine..
12:54	dakrone	yea, however, Amazon also has a free service that will convert a doc to kindle format so it behaves like regular text, if you would rather use that
12:55	rubydiamond	dakrone: okay..
12:55	dakrone	anyway, we've hijacked the #clojure room for long enough probably, feel free to pm me if you have any other questions :)
12:55	rubydiamond	dakrone: thanks for the help.. it would definitely help me
12:56	rubydiamond	dakrone: yeah.. lets stop talking about kindle.. and i am ordering one .. kindle 2
12:56	rubydiamond	technomancy, lpetit thanks guys.. gonna order one
12:57	nDuff	rubydiamond, ...personally, I wouldn't buy a non-DX Kindle -- if I wanted something for which I'd be using non-reflowed text (that is, not PDFs), I'd buy a reader with ePub support to reduce vendor lockin.
12:59	technomancy	it's pretty trivial to translate between .epub and .mobi though
12:59	technomancy	they're both HTML subsets
13:00	rubydiamond	technomancy: yeah right ..but code snippets would lose formatting
13:03	TakeV	What is the function to import clojure scripts into the current namespace, if they are not in the same directory? Like, if I was working in ~/cljapp, and I needed a script from ~/libraries/clojure?
13:05	rys	load-file at a guess
13:05	TakeV	(doc load-file)
13:05	clojurebot	"([name]); Sequentially read and evaluate the set of forms contained in the file."
13:05	pdk	(doc alias)
13:05	clojurebot	"([alias namespace-sym]); Add an alias in the current namespace to another namespace. Arguments are two symbols: the alias to be used, and the symbolic name of the target namespace. Use :as in the ns macro in preference to calling this directly."
13:06	TakeV	Hmm, alright, thanks.
13:07	tomoj	TakeV: don't do that, though
13:07	tomoj	:)
13:09	TakeV	tomoj: Why not?
13:09	tomoj	well, maybe there could be some situation in which that would be a good thing to do
13:10	cmiles74	TakeV: I think you want to use the "ns" macro.
13:10	tomoj	if it's simply that your project in ~/cljapp depends on a project living in ~/libraries/clojure, you should use leiningen or maven or something instead
13:11	tomoj	or at least jar up whatever's in ~/libraries/clojure and put it on the classpath for ~/cljapp
13:11	cmiles74	Something line (ns takev.cljapp (:use [clojure.contrib.logging]))
13:14	tomoj	if you do a load-file with an explicit path to ~/libraries/clojure/..., no one else will be able to use your code, it will be a pain in the ass to deploy
13:14	tomoj	and probably other terrible things will happen
13:14	polypus	~ping
13:14	clojurebot	PONG!
13:17	TakeV	tomoj: Hmm, then is there anyway to have a general library like I'm trying to do, without having to recompile it and move it to the new folder, each time I make a change to one of the files?
13:19	tomoj	lein 1.2.0 can do that
13:20	tomoj	it may actually be easier for you right now to use some evil load-file stuff for development
13:20	tomoj	just get rid of it eventually :)
13:20	TakeV	I'd rather do it right than do it easy, but if they are one in the same then I'll do that. :)
13:21	rhudson	Don't use and require work with source files as well as compiled?
13:21	tomoj	but these source files aren't on the classpath
13:21	tomoj	(unless using lein's new checkouts thingy..)
13:21	TakeV	rhudson: I'm just not sure how to get them to work, when they are not in the project folder.
13:21	rhudson	The containing directory would have to be, sure
13:24	rhudson	If you have ~/mylib/pkg1/src1.clj, and src1.clj starts with (ns pkg1.src1), and ~/mylib is on your classpath
13:25	tomoj	hmm, looks like lein will end up putting a checkout dep on the classpath twice, one from the checkout, one from whatever's in your .m2
13:25	tomoj	wonder if that could cause trouble
13:27	TakeV	Hmm, actually, wonder if Clojars would be a good way to handle that. Lein would take care of the busywork.
13:27	tomoj	how would clojars help?
13:29	TakeV	tomoj: Lein's deps function would pull the library when needed.
13:30	technomancy	tomoj: the copy in checkouts will take precedence
13:30	tomoj	I guess clojure jars are special in that having multiples can break things?
13:31	technomancy	shouldn't be
13:31	tomoj	oh, maybe it's just that when you have multiples they might end up in the wrong order on the classpath
13:31	technomancy	there are ways to search the classpath beyond the first hit for a given file, but use and require will only honor the first.
13:31	technomancy	yes, ordering is important.
13:31	tomoj	I meant clojure jars as in, clojure.jar and clojure-contrib.jar
13:32	tomoj	TakeV: yeah, but you'd have to recompile and push every time you made a change
13:32	tomoj	you could get the same effect without clojars by just `lein install`ing after each change, but again that's a pain, so, checkout deps to the rescue :)
13:32	TakeV	tomoj: Yeah, but that is still easier than manually copying the jar to each project that uses it when I make a change.
13:33	tomoj	ah, right
13:33	TakeV	Hmm, how do checkout deps work? I'm not familiar with them.
13:33	tomoj	`lein install` in the changed project then `lein deps` in the other will do that for you
13:33	tomoj	(no need for clojars)
13:34	TakeV	Deps can grab a jar from, say, ~/libraries/clojure?
13:34	tomoj	`lein install` in your ~/libraries/clojure/foo lein project will install the foo jar into your local maven repo
13:35	tomoj	then `lein deps` in the other project uses that one
13:35	technomancy	TakeV: create a "checkouts" dir in your project root, and then symlink the checkout of the dependency into that directory
13:35	TakeV	The checkout being the jar?
13:39	Bahman	Hi all!
13:40	technomancy	TakeV: no, the root directory of the project you're depending on
13:40	TakeV	Ah, alright. That makes sense.
13:40	TakeV	Thank you.
13:43	matt3402382	Hi! Any pointers on how I can access the xml in a POST request in compojure? (btw I can get key=value params from a POST request in compojure and all works fine)
13:46	tomoj	hmm, do you have to visit the file in emacs through the symlink?
13:46	tomoj	guess I'll try it out..
13:51	tomoj	somehow it works, awesome
13:54	matt3402382	anyone familiar with compojure? I have a simple example working, and can pull out key=value pairs from an http POST on the server side, however when I use a client side framework which does an http POST with a piece of xml (not key=value pairs) I have no idea how to access it from the request on the server. Any ideas?
14:08	dakrone	matt3402382: I would try the #compojure room and see if anyone there knows
14:10	matt3402382	dakrone: ok thanks!
14:23	cemerick	hrm, looks like it's not possible to redefine a protocol interface if it's available in a prior AOT'ed form on the classpath
14:23	cemerick	...even if the only evaluated form is a new protocol definition :-/
14:41	yacin	is there a way to make lein compile-java have the -Xlint:deprecation option?
14:47	lancepantz	yacin: i don't know, but i would expect it to respect the JAVA_OPTS env
14:48	dpritchett	Silly question but does anyone know a particular resource that will help me understand when to use which higher-order function? I find myself using map or reduce when I see other folks using apply and I don't know if it matters.
14:49	dpritchett	I'm doing simple arithmetic for project euler problems such as "find the max of this list" or "find the max of the products of the contents of these lists"
14:51	jmatt	dpritchett: Look at the source is probably the simplest way to decide which function to use.
14:54	yacin	lancepantz: huh, doesn't seem to work so hot
14:54	yacin	25402 clj-ml-3.7.1:upstream!? % lein compile-java 2010-07-21 14:53:01 ynadji ttys012
14:54	yacin	Unrecognized option: -Xlint:all
14:54	yacin	Could not create the Java virtual machine.
14:55	jmatt	dpritchett: (use 'clojure.contrib.repl-utils) then you can do (source apply) etc
14:55	lancepantz	yacin: not sure man, i actually don't use lein, but i'm surprised that doesn't work
14:56	yacin	you and me both
14:56	dpritchett	thanks jmatt! I'm looking at map, reduce, and apply on clojuredocs.org right now
14:59	hugod	cemerick: same problem as #371?
15:00	jmatt	dpritchett: also doc is useful from the repl example: (doc apply) If you want more information on those concepts - any scheme or lisp book will work. No reason to look for something that is clojure specific.
15:00	cemerick	hugod: Seems like it, yes
15:01	dpritchett	jmatt: maybe i should dig sicp out again tonight. i'm not too far through it yet
15:06	kriyative	Hi all, quick leiningen question: any suggestions on speeding up `lein deps'? Seems to take a long time cycling through the various repos. Or is this more an issue with maven?
15:07	technomancy	kriyative: the more snapshot versions you have, the slower lein deps runs.
15:08	kriyative	technomancy: I'm not intentionally specifying any snapshot versions i.e, all the dependencies are to stable versions
15:09	technomancy	hmm; in that case future runs should be fast
15:09	technomancy	the first run will always be slow
15:10	kriyative	ok, perhaps the repo servers themselves are hard hit, because it seems to take 60-120 seconds to decide the repo doesn't have the necessary pom or jar, and move on to the next repo
15:14	kriyative	technomancy: so, this initial slow run is maven related?, and does it help to have a local maven proxy, at least for second and later developers?
15:15	kriyative	sorry to badger with these questions, but I'm new to maven and leiningen. I really like leiningen but maven ... not so much :)
16:04	erikcw1	I just upgraded to lein-1.2 and now I'm having trouble creating jars. I'm using lein-javac to compile so Java code into my project. It seems to work fine (puts class files in classes/ directory). The problem is that lein uberjar deletes the contents of the classes/ directory as its first step. So I get a compile error about the missing class. How do I include lein-javac as a build step?
16:12	tomoj	erikcw1: hooks
16:12	tomoj	I assume
16:13	erikcw1	tomoj: I guess I'll have to read up on that. Wasn't sure if anyone else had run up against the same issue
16:13	tomoj	there's a bit of info in the PLUGINS.md
16:17	bhenry	can someone help me make this better. https://gist.github.com/62e3f6c5c8cd3ddd4d5e i'd like to be able to have a list of extensions and match all files case-insensitively with those extensions.
16:18	bhenry	(get-files dir) returns all file objects within that dir and its subdirs.
16:19	bhenry	for now i'm only looking at jpg, gif, and png, but in the future i may want to add more to that list, so it would be nice to make the get-images function more adaptable
16:20	Chousuke	bhenry: you could combine the regexes into a single one
16:21	bhenry	i'm not so good with regexes. plus how do i make it match JPG as well?
16:21	tomoj	clojurebot: regex?
16:21	clojurebot	Sometimes people have a problem, and decide to solve it with regular expressions. Now they have two problems.
16:22	Chousuke	bhenry: I think there are some special regex thingies
16:22	mefesto	bhenry: i think this would work: #"[.](jpg\|png\|gif)$"
16:23	Chousuke	hmm
16:23	bhenry	mefesto: i'll try it out
16:24	Chousuke	put a ?i at the front of the regexp to make it case-insensitive
16:26	blais	Is there a way to escape a newline char in a multi-line string literal in clojure?
16:26	blais	e.g. using '\' at the EOL does not work
16:26	tomoj	Chousuke: how? thought we couldn't do that in java
16:27	bhenry	mefesto that worked! thank you.
16:27	chouser	blais: as in you want a newline in your code, but not in the resulting string?
16:27	mefesto	,(re-find #"(?i)[.](png\|jpg\|gif)$" "test.JPG")
16:27	clojurebot	[".JPG" "JPG"]
16:27	tomoj	oh, in parens?
16:27	blais	chouser: Yes.
16:27	Chousuke	tomoj: I got that from the JVM docs :/
16:28	blais	I have some sort of multi-line template which I'm declaring (and later on, massaging). I want the first line without a newline, but I also want to start it at column 0 in my input file. I'd escape the first newline char.
16:28	chouser	blais: yeah, I don't think there's a way to do that in a single string literal
16:28	blais	tomoj: btw thx the other day for your assistance, the problem was that somehow leiningen fell out of sync, I must have interrupted it while it was downloading, and it was in a funky state. Killing ~/.m2 and redownloading fixed the issue.
16:29	blais	chouser: thx.
16:29	bhenry	mefesto: thanks again! i couldn't get chousuke's suggestion to work until you posted the correct syntax.
16:29	mefesto	np, lemme pass a thanks to chousuke since I didn't even know about (?i) till he said it :)
16:38	blais	An emacs / swank question: when I eval (println "blablabla") output goes to my slime repl buffer.
16:39	blais	However, when I eval (do (for [x [1 2 3 4]] (println x))), output goes to my minibuffer.
16:39	blais	Any idea why?
16:40	mefesto	blais: where does a (doall (for [x [1 2 3 4]] (println x))) go?
16:41	blais	Ah.
16:41	blais	To the repl
16:42	blais	I suppose the code that forces the evaluation of the seq overrides the out stream somehow.
16:42	blais	mefesto: Thx.
16:42	technomancy	kriyative: sorry, was at lunch. yes, a local maven proxy will help.
16:46	blais	What is the best way to (read) and entire file's definition and return the values of all the top-level expressions contained therein?
16:48	chouser	blais: 'read' consumes only one top-level expression at a time from the IO stream you give it, so you could do that in a loop, eval'ing each one separately.
16:49	fualo	bas
16:49	blais	chouser: thx; That's what I've been doing just now; I thought there might be something pre-cooked since it feels like something common (e.g. use a clj file itself as an input file and gather the definitions therefrom).
16:49	fualo	er, sorry, wrong window!
16:50	chouser	blais: if you can require the input be a single expression (perhaps a literal map) that would simplify things.
16:50	blais	Riiight.
16:51	dpritchett	I'm uncomfortable with the look of this code, can anyone offer an improvement? (take 10 (map first (iterate (fn [[t n]] (let [i (inc n)] [(+ t i) i])) [1 1]))))
16:51	dpritchett	my first attempt had (+ 1 i) in two places so I figured I'd replace those with (inc i) and then I really didn't want to write (inc i) twice and so i switched to the let but now it's longer than before and I don't like that either
16:53	dpritchett	looks like I have a superfluous ) at the end, sorry. i copied this from my definition of a lazy sequence for triangle numbers
16:53	clojurebot	gender is irrelevant
16:53	blais	chouser: here's what I did: http://pastebin.com/pm10kn8d
16:53	blais	chouser: (I'm a clj newbie, any comments welcome)
16:53	chouser	dpritchett: perhaps (take 10 (map first (iterate (fn [[t n]] [(+ t n) (inc n)]) [1 2])))
16:54	LauJensen	Any Clojure-Maven fundamentalists in the house tonight?
16:55	chouser	dpritchett: ooh, I think I found a nice solution using 'reductions'
16:56	blais	I'm on a REPL high, don't want to go back to the compiler. Have been trying to wean myself of this clj toy project all day now :-)
16:56	chouser	blais: read-expressions looks solid. I suspect there may be a better formulation of read-eval-expr
16:57	chouser	hm, actually you should probably close the reader too when you're done. maybe use 'with-open'
16:59	chouser	blais: read-eval-expr has a non-tail recursion that's a bit worrisome. perhaps use 'repeatedly' insteada?
17:00	mefesto	is it possible to create a temp namespace, load the file, then inspect that ns using ns-publics or something?
17:00	dpritchett	your rewrite of my triangle function makes sense chouser, curious about your reduction solution
17:00	chouser	mefesto: yeah, I've done that, but it's probably not ideal.
17:00	chouser	,(reductions + (range 1 10))
17:00	clojurebot	(1 3 6 10 15 21 28 36 45)
17:01	chouser	mefesto: you'd lose the order of things (if that matters), plus it's simply not pure functional anymore.
17:01	fualo	this is more of a introductory lispy question (I come from python/C) but what is the clojurey/lispy way to insert something in the middle of a list? or is this code smell?
17:01	arete	is there a canonical way of defining a root binding that preserves the bound value across a compile-and-load cycle?
17:01	arete	or does one just use an if bound?
17:02	chouser	fualo: depends on what you're doing. not automatically a code small at all.
17:03	chouser	arete: defonce
17:03	arete	hah go figure, thanks =)
17:05	erikcw1	How do I use :keywords with a space in them. (keyword "test this") seems to work, but I can figure out how to use the keyword using the : syntax.
17:05	technomancy	erikcw1: keywords with spaces in them aren't really kosher
17:06	technomancy	it's an open question whether (keyword "test this") should even work
17:06	chouser	erikcw1: that's not a readable keyword. the fact that the 'keyword' function lets you make them is a bit of a bug.
17:06	chouser	http://www.assembla.com/spaces/clojure/tickets/17
17:06	fualo	thanks chouser!
17:07	technomancy	oh hey, there it is
17:07	chouser	fualo: you can insert stuff in the middle of a sorted map, for example.
17:07	chouser	fualo: or in the middle of a sequence
17:08	fualo	chouser: ah, that seems to be a good way. If you had to do it in a list, would you just cycle through to the point and return the concatenated list?
17:08	fualo	this is just early understanding stuff - nothing practical
17:08	fualo	(for me)
17:08	chouser	well -- I would generally try to avoid doing it in a list.
17:09	fualo	chouser: ah, ok. It would be O(n) worst unvoidably, no?
17:09	chouser	fualo: right
17:09	fualo	thanks
17:09	chouser	fualo: for something like a priority queue, a sorted map works well
17:10	fualo	right, right
17:10	fualo	awesome thanks
17:10	fualo	I have the MEAP version of your book btw, great work; I quite like it
17:10	chouser	if you really want to insert something at a specific index and still want fast lookup by index, this may be one of the rare use cases for finger trees.
17:10	chouser	fualo: ah great, thanks!
17:11	Blaine	I'm using clojure for the first time, it is freakin' sweet
17:12	dpritchett	Here's an ugly attempt, not sure you'd want to keep it but:
17:12	dpritchett	,((fn [n] (lazy-cat (take-while #(not= n %) '(1 2 3 4 5 6 7)) (drop-while #(not= n %) '(1 2 3 4 5 6 7)))) 5)
17:12	clojurebot	(1 2 3 4 5 6 7)
17:15	Blaine	I wish the docs had examples under each function though
17:15	chouser	Blaine: not an uncommon desire. clojuredocs.org seems to be filling in pretty well there at the moment.
17:15	mefesto	Blaine: the mailing list was talking about this site: http://clojuredocs.org/
17:15	dpritchett	Blaine - clojuredocs.org and clojure-examples.appspot.com both have examples side by side with docstrings and source
17:17	Blaine	oh wow
17:17	Blaine	that is slick
17:22	dpritchett	chouser how would you turn your (reductions + (range 1 10)) example into a lazy sequence?
17:25	chouser	,(take 10 (reductions + (iterate inc 1)))
17:25	clojurebot	(1 3 6 10 15 21 28 36 45 55)
17:27	dpritchett	Is that O(n)? I can't figure out whether or not it is starting from 1 each time you pop one off
17:28	chouser	heh, it's not starting anything over. reductions is O(1) per item consumed
17:28	chouser	reductions is like reduce in that it feeds the result of one iteration into the next
17:29	dpritchett	ah, thanks
17:29	chouser	the difference is that instead of doing that eagerly and returning a single value at the end, it does it lazily, returning a lazy seq of each intermediate value
17:34	dpritchett	so the final value of the reduction is the same as the return value of reduce would've been?
17:34	dpritchett	final element in the reduction sequence that is
17:34	dpritchett	,(last (take 10 (reductions + (iterate inc 1))))
17:34	clojurebot	55
17:35	chouser	drewolson: right, but you'll have to rearrange that to keep reduce from running forever.
17:36	chouser	,(reduce + (take 10 (iterate inc 1)))
17:36	clojurebot	55
17:36	chouser	,(last (reductions + (take 10 (iterate inc 1))))
17:36	clojurebot	55
18:03	thunk	e
18:04	thunk	er, sorry. emacsarrhea.
18:05	kriyative	technomancy: thanks for the follow-up; the "deps" performance improved over time, which leads me to think it was either a connectivity issue or server load. I'll look into setting up a local maven proxy.
18:09	mabes\|away	aside from removing it, how does one handle a circular dependency in clojure?
18:10	mabes	is there some way to do forward declaration (across namespaces)? I've tried opening up the ns and using declare but it seems like the real ns is then never compiled...
18:13	danlarkin	mabes: pet peeve of mine
18:13	danlarkin	you cannot have circular dependencies
18:14	danlarkin	unless you do it at runtime... which you really shouldn't
18:14	mabes	danlarkin: sigh.. I know it is usually a sign of coupling but it seems legit in this case
18:20	arohner	mabes: you can (with-ns 'foo (declare bar))
18:20	danlarkin	mabes: yep :-/ it's dumb
18:21	danlarkin	well, dumb is not right. I understand the reasons it's not supported. It's hard
18:21	danlarkin	it's just occasionally quite annoying
18:21	mabes	arohner: ah, I had tried in-ns and just ns.. let me try that.. in one case that may help, but I'm also running into issues with defrecord as well which I'm willing to bet there is no way around it..
18:21	arohner	mabes: with-ns is in contrib somewhere, don't remember off the top of my head
18:21	arohner	*don't remember where
18:22	mabes	arohner: I'll find it and try it out
18:24	danlarkin	ns-utils or something
18:26	mabes	it is in with-ns .. however, I am getting class not found errors with it
18:46	mabes	arohner: is this what you meant when you suggested with-ns? https://gist.github.com/485247/2b012c9f6403ff7c12402733cdfeb97d1ce1d0dd
18:47	mabes	arohner: see foo.core
18:47	mabes	arohner: I've tried that, in-ns, and simply ns, and I think danlarkin is right.. you can't really have circular deps in clojure (unless you do it during runtime as dan pointed out)
19:15	technomancy	anyone know what the plexus/components.xml file in jars is for?
19:29	Blaine	is there a clojure equivalent to something like this in haskell: function 1 = false; function 2 = true; function n = [...] ?
19:32	Blaine	basically some pattern matching foo that determines the behavior of the function
19:32	Blaine	or am I just going to have to use some big nasty if statements?
19:33	defn	im not following you
19:34	Blaine	defn: http://gist.github.com/485313
19:34	Blaine	something like that
19:34	Blaine	it doesn't work of course
19:34	Blaine	but it'd be awesome if it did
19:35	Blaine	haskell supports something like that
19:35	defn	so you want a specific condition for 1, 0, 2, and x?
19:35	Blaine	yeah, without a big mess of if statements
19:35	defn	use cond
19:35	eckroth	what is the simplest way to replace an element in a vector without knowing its position in the vector?
19:35	defn	or condp
19:35	defn	Blaine: depending on what x is you sort of have the right idea
19:36	Blaine	sweet, that'll do
19:36	defn	(defn foo ([x] ...) ([x & xs] ...))
19:36	defn	you can do that when the arity is different
19:36	defn	but otherwise you need cond
19:37	Blaine	could one whip up a macro to implement that hair-brained idea?
19:37	defn	er uhh emmm, thinking
19:38	Blaine	it's a really nice feature I miss from haskell
19:38	Blaine	it has a more mathy feel to it
19:38	defn	i guess you could write a macro i think
19:38	defn	im not a macro aficionado
19:38	defn	but that seems doable
19:38	Blaine	me either, unfortunately
19:41	Blaine	also, what the heck is this? #<user$is_prime_QMARK___2 user$is_prime_QMARK___2@320cf66b> 101
19:41	technomancy	Blaine: http://github.com/technomancy/serializable-fn
19:42	technomancy	(it's the compiled representation of a function)
19:43	Blaine	oh, freakin' sweet
19:44	eckroth	It's a bit counter-intuitive to me that (find map key) needs a key and returns the value; is there a function like (find' map val) that returns the key?
19:46	Blaine	technomancy: this may seem like a retarded question, but is there a way to install that nifty library globally?
19:47	Blaine	other than specifying it as a dependency in my project.cls file
19:47	technomancy	Blaine: no, dependencies are done on a per-project basis
19:47	mabes	Blaine: when you use leinigen it uses maven under the hook and it caches it in your ~/.m2 dir
19:47	mabes	Blaine: this project may be what you are looking for though: http://github.com/liebke/cljr
19:48	Blaine	oooh yeah, that sounds exactly like what I'm looking for
19:48	Blaine	something like rubygems or python's easy_install
19:50	mabes	technomancy: wow, I have been looking for something like serializable-fn forever, thanks!
19:52	dnolen_	eckroth: you could write a function that iterates over the whole map and find the matching key for a val. But that'll be slow. Might be wiser if your going to do that a lot to create a map that holds the reverse lookup. With Clojure's STM you can sleep well at night knowing that you can update both maps atomically.
19:52	eckroth	fwiw, my solution: (assoc this :vals (map #(if (= % special-value) (transform special-value) %)) (:vals this))
19:52	technomancy	mabes: cool
19:52	eckroth	dnolen_: ah a reverse-lookup map; good idea
19:54	technomancy	,(let [m {:a :b :c :d}] (zipmap (vals m) (keys m)))
19:54	clojurebot	{:d :c, :b :a}
19:55	eckroth	technomancy: thanks I'll copy that
19:58	mmarczyk	technomancy: have you actually come across a jar with a plexus/components.xml file inside it?
19:58	mmarczyk	technomancy: here's a description of what it's supposed to do: http://plexus.codehaus.org/guides/developer-guide/configuration/index.html
19:58	technomancy	mmarczyk: no... I am just trying to clean up some lein code that mentions it
19:59	technomancy	thanks
19:59	mmarczyk	technomancy: but to my eyes, it's some inscrutable piece of Javaish weirdness
19:59	mmarczyk	technomancy: also, thanks for the bump to my lein access level
19:59	technomancy	yeah, pretty much
20:00	technomancy	mmarczyk: np... just remember the spiderman thing about great power/great responsibility =)
20:00	mmarczyk	sure... I'm still planning to have my code reviewed before inclusion, so you're not escaping pings when new stuff is ready :-P
20:05	blais	Is there a way to implement a constructor for a (deftype) if it is not AOT compiled?
20:05	mmarczyk	technomancy: this might be relevant too... just to get a muddier (= more realistic) picture of thiings: http://www.mail-archive.com/dev@maven.apache.org/msg74346.html
20:08	TakeV	So, if 1.2 in it's pre-release stage? I notice it hasn't been updating in a while.
20:08	mmarczyk	blais: it doesn't matter whether it's aot'd or not, (deftype Foo []) -> (Foo.) is available
20:09	mmarczyk	TakeV: have you noticed the move to GitHub's "organisation" facility? -> http://github.com/clojure
20:09	mmarczyk	Raynes: pong? (I think I missed a ping earlier...)
20:10	TakeV	mmarczyk: Ah, no.
20:11	Raynes	mmarczyk: I was wondering if you ever got around to fixing that quote bug in that monstrosity?
20:11	Raynes	;p
20:12	Raynes	I'm actually using it in gotmilk, because it's not necessarily likely that anyone will try to escape quotes.
20:12	mmarczyk	Raynes: check out that SO answer, I've updated it recently :-)
20:12	Raynes	Cool. I'll check it out in a little while.
20:12	mmarczyk	Raynes: I've definitely not fixed the 'monstrosity' part, though
20:12	Raynes	It works though!
20:12	Raynes	:D
20:12	Raynes	And I didn't have to write it.
20:12	Raynes	:)
20:12	mmarczyk	well, hopefully :-)
20:12	mmarczyk	right. :-)
20:35	arohner	is there a fast way to "memset" a whole java array, rather than looping on aset?
20:36	hugod	technomancy: plexus/components.xml is used in maven plugins
20:37	hugod	technomancy: have a look in clojure-maven-plugin.jar
20:41	technomancy	hugod: any idea what this is about? http://github.com/technomancy/leiningen/blob/master/src/leiningen/uberjar.clj#L58
20:43	dnolen_	arohner: this might be helpful, http://www.searchenginecaffe.com/2007/03/how-to-quickly-reset-value-of-java.html
20:44	arohner	dnolen_: thanks
20:45	hugod	technomancy: at a higher level than that it is just skipping the component.xml's?
20:54	dnolen_	hmm
20:55	dnolen_	why can't you derive, underive, derive?
20:55	dnolen_	,(derive ::bar ::foo)
20:55	clojurebot	nil
20:55	dnolen_	,(underive ::bar ::foo)
20:55	clojurebot	nil
20:55	dnolen_	(,derive ::bar ::foo)
20:55	dnolen_	,(derive ::bar ::foo)
20:55	clojurebot	java.lang.NullPointerException
20:56	dnolen_	clojurebot henceforth can no longer derive ::bar ::foo
21:00	pdk	how many other ways are there that we can break the bot then
21:01	pdk	id figure its smart enough to not let you put in obvious infinite loops
21:05	dnolen_	pdk: the point wasn't really about breaking the bot, I think that's a bug in Clojure's hierarchies
21:05	pdk	well
21:05	pdk	in spirit!
21:06	dnolen_	,(derive ::y ::x)
21:06	clojurebot	java.lang.NullPointerException
21:06	dnolen_	huh actually the hierarchy is now borked
21:06	dnolen_	period
21:10	mmarczyk	dnolen_: got it -- there's a typo in underive
21:10	dnolen_	mmarczyk: sweet
21:10	mmarczyk	dnolen_: should be :parents, is: :parent
21:11	mmarczyk	dnolen_: apparently underive is not among the most used functions in clojure.core ;-)
21:13	mmarczyk	dnolen_: I'll make a ticket for that, though with my CA still not ack'd, it'll be without a patch...
21:14	dnolen_	mmarcyzk: it's a pretty bad bug and an easy fix, perhaps some else will move on that.
21:16	hugod	technomancy: sorry, bed time for the kids. It looks like it is building a combined components.xml, out of the individual components.xml files.
21:17	hugod	'just collecting all the :component tags
21:18	hugod	putting the return of copy-entries into the result vector, and then ignoring it looks strange
21:20	mmarczyk	dnolen_: https://www.assembla.com/spaces/clojure/support/tickets/406-typo-in-underive-causes-breaking-in-the-resulting-hierarchy
21:22	dnolen_	mmarczyk: thx.
21:36	blais	mmarczyk: but can I override it and provide my own?
21:41	mmarczyk	blais: you can't do that with deftype regardless of whether you aot or not
21:56	blais	Does clojure have memq? What's the equivalent?
21:56	blais	Arrg contains?, go tit.
22:10	mmarczyk	blais: contains? is not a memq equivalent
22:11	mmarczyk	blais: in fact, there isn't one... you can build it yourself with some, though
22:11	mmarczyk	,(some #{:foo} [:bar :foo :baz])
22:11	clojurebot	:foo
22:12	mmarczyk	(notice how it only checks for the presence of the element in the collection; but you could use the general idea to recreate member/memq with help from other seq fns)
22:24	Lajla	,(contains? 2 '(1 2 3 4 5))
22:24	clojurebot	false
22:24	Lajla	mmarczyk, how does contains work then?
22:24	Lajla	,(contains? '(1 2 3 4 5) 3)
22:24	clojurebot	false
22:25	Lajla	,:phallic
22:25	clojurebot	:phallic
22:27	Lajla	,(let [I + Worship 1 His 2 Shadow 3] (I Worship His Shadow))
22:27	clojurebot	6
22:29	lancepantz	,(contains? #{1 2 3 4 5} 3)
22:29	clojurebot	true
22:29	lancepantz	Lajla: it operates on sets
22:29	Lajla	lancepantz, ahhh
22:29	Lajla	Then
22:29	Lajla	Ahh
22:30	Lajla	it gives a bool
22:30	Lajla	not null/3
22:30	lancepantz	yes
22:30	Lajla	lancepantz, may I worship your shadow?
22:30	Lajla	Your Divine Shadow
22:31	lancepantz	i hate tool
22:35	tomoj	,(contains? [3 4 5] 2)
22:35	clojurebot	true
22:35	lancepantz	suppose one should say it operates on indexed seqs?
22:36	lancepantz	oh wait
22:36	tomoj	oh fuck
22:36	tomoj	suddenly M-x slime-connect doesn't bring up a repl
22:36	lancepantz	ah, right, because 2 is the index of 5
22:36	blais	tomoj: you're using the old stuff.
22:36	tomoj	I think it operates on Associatives or something like that
22:36	tomoj	old stuff?
22:37	blais	I like the new way better: you start your process (which runs swank).
22:37	blais	Then use slime-connect to connect to it.
22:37	blais	So much less confusion.
22:37	tomoj	isn't that what I said?
22:37	blais	oh right.
22:38	blais	mmarczyk: what's the equivalent of memq/memberq then?
22:38	tomoj	I just recently upgraded slime and slime-repl, but have restarted emacs since then and verified that they still work :(
22:38	tomoj	,(some #{2} [1 2 3])
22:38	clojurebot	2
22:38	blais	who
22:38	blais	whoa
22:38	blais	that sounds inefficient
22:39	blais	come on... there just HAS to be a find operation, that just HAS to be supported.
22:39	tomoj	umm
22:39	blais	e.g. (find-first coll k) or soemthing
22:39	tomoj	were you expecting constant time?
22:39	blais	Nope.
22:39	tomoj	why does it sound inefficient, then?
22:40	blais	I took note of this while reading SHalloway's book, but of course the book is sitting at home now.
22:40	tomoj	there is a find-first, but it's not like that
22:40	blais	B/c what you wrote is more general, it's checking for inclusion of a set, i just want to check for a single element
22:40	blais	"is this element present in the sequence"-p
22:40	tomoj	yes, (some #{element} sequence) is the idiomatic way
22:41	blais	Wow.
22:41	tomoj	and it's just as efficient as any other solution
22:41	blais	I just have t fall on my butt for a 1000 years.
22:41	blais	Wait, I need to get back on my chair now.
22:41	blais	(some #{2 3 4} seq) will have to build a temp. data structure, or be > O(N)
22:42	tomoj	huh?
22:42	blais	i'll go to the repl, I _must_ be missing something
22:42	tomoj	it just calls #{2 3 4} on successive elements of seq until it gets a truthy return value
22:42	tomoj	i.e. it has found either 2, 3, or 4
22:43	tomoj	(or it returns nil if it never does)
22:43	blais	Ah I seen, EITHER is the key
22:43	blais	got it.
22:43	blais	In any case, wouldn't it make sense to have memq too?
22:43	tomoj	I dunno
22:44	blais	Languages are so interesting.
22:44	tomoj	this is a FAQ
22:44	tomoj	but if rich didn't have a good reason, he would've changed it by now
22:44	tomoj	wonder what the reason is
22:46	blais	"Sequential lookup is not an important operation."
22:46	rhudson	As I recall, he's said that he really wants to encourage people to use the appropriate collection type for the operations expected on it.
22:47	blais	in the programming faq.
22:48	blais	Well there is a "verb" in my mind that means "is-this-object-in-this-sequence"-p and I'll code myself one.
22:49	blais	Languages have funny quirks; this is one. This is the equivalent of Python not having linked-lists as a native data type and people being fine with it.
22:50	tomoj	that doesn't sound right
22:50	blais	This is an interesting quirk though.
22:50	blais	tomoj: which part?
22:50	tomoj	(memq foo bar) vs. (some #{foo} bar) seems trivial
22:50	tomoj	lack of a certain native data type could be a big pain though
22:50	hiredman	,(.contains '(foo) 'foo)
22:50	clojurebot	true
22:51	blais	It's a slightly different "verb.", the latter just happens to include the former.
22:52	tomoj	it does seem quirky, yeah
22:52	tomoj	I wonder if rich has explained this somewhere on the ML
22:52	tomoj	that .contains is already there might be good enough reason
22:54	blais	Ahh I see. .contains. See I don't know anything about java so these don't come to mind.
22:55	tomoj	good enough reason for rich, I should say
22:55	mmarczyk	blais: you can use (some #(= foo %) bar)
22:56	mmarczyk	if you're worried about constructing a set
22:56	mmarczyk	but you shouldn't be
22:56	blais	mmarczyk: yeah, that's closer to what I'm interested in. Thx.
22:56	tomoj	constructin a set seems cheaper than constructing a fn
22:57	mmarczyk	blais: I'm finding it hard to measure the difference in runtime between (some #{:foo} ...) and (some #(= :foo %) ...)
22:57	tomoj	oh, d'oh
22:57	blais	Wont' the fn be baked at compile time?
22:58	blais	I can bet, maybe it's me being a bit of a purist.
22:58	tomoj	but you get a class for the fn, right?
22:58	mmarczyk	I wouldn't call that "purist"
22:58	tomoj	I didn't have slime-repl installed
22:59	mmarczyk	used to memq, perhaps ;-)
22:59	blais	tomoj: DK. Still a newbie, don't quite understand what's going on under the covers yet.
22:59	blais	Maybe I should just play it idiomatic and stfu.
23:00	mmarczyk	there are valid reasons for #(= foo %) in some, though
23:00	mmarczyk	if foo might be nil or false
23:01	blais	good point
23:01	mmarczyk	you'll want either that or {foo true} (a map)
23:01	mmarczyk	etc.
23:01	tomoj	huh
23:01	tomoj	never thought about that
23:01	mmarczyk	and I don't think anyone would complain about your code being nonidiomatic if you write #(= foo %) as a matter of preference
23:01	tomoj	I missed it, you mean like (let [x nil] (some #{x} aseq)) ?
23:01	mmarczyk	tomoj: yeah
23:02	tomoj	guess that is pretty rare
23:03	mmarczyk	blais: but there's no performance issue with (some #{foo} ...), except that often it is a better idea to use a data structure which better supports key lookups to begin with
23:04	tomoj	,(doc some)
23:04	clojurebot	"([pred coll]); Returns the first logical true value of (pred x) for any x in coll, else nil. One common idiom is to use a set as pred, for example this will return :fred if :fred is in the sequence, otherwise nil: (some #{:fred} coll)"
23:04	mmarczyk	thereby avoiding O(n) complexity
23:04	blais	mmarczyk: totally in your boat.
23:04	mmarczyk	blais: :-)
23:05	blais	Note that I'm using Clojure to avoid writing Java (:-)) and I'm having to deal with a lot of snafu'ed stuff.
23:05	blais	(Not always my choice.)
23:05	mmarczyk	:-)
23:05	blais	I've been hacking some Clojure shtuff all day, I can't stop. Still sitting at the terminal at work and it's 11pm!
23:06	blais	"The repl experience"
23:06	blais	So addictive.
23:06	mmarczyk	indeed :-)
23:09	tomoj	hacks and glory await!
23:17	blais	How do you convert a keyword into its equivalent symbol?
23:17	arohner	,(symbol (name :foo))
23:17	clojurebot	foo
23:18	blais	Aaa, nice. (name). Didn't know. Thx arohner.
23:32	tomoj	I think you need a macro
23:33	blais	tomoj: in order to eval within "." ?
23:33	blais	this fails too:
23:33	blais	(let [msg (VersionMessage.)] (set! (. msg (symbol (name :version_major))) 2))
23:33	blais	(same story)
23:34	tomoj	I believe the problem is that you can't do (. msg (symbol "foo"))
23:34	tomoj	needs to be (. msg foo)
23:34	tomoj	don't have any objects with public fields handy to play around with
23:35	tomoj	(or do I?)
23:35	talios	System.out :)
23:35	talios	Its a class with a public field at least
23:37	tomoj	can you set! it?
23:37	tomoj	it's final I think?
23:37	talios	yep
23:38	talios	I do it often - reassign System.out to a be a Writer than delegates to log4j or something
23:38	blais	public and non-final
23:38	tomoj	hmm
23:38	blais	I can set it when I specify the attribute explcitly.
23:38	tomoj	I get an IllegalAccessError trying to set it to nil
23:39	blais	Hey, another one: is there a way to set the cdr to a cons cell not as a list, in CLojure?
23:39	mmarczyk	(.set (some #(= (.getName %) "foo") (.getFields VersionMessage)) "value")
23:39	mmarczyk	?
23:39	mmarczyk	blais: nope, no classic cons cells
23:39	blais	e.g. in elisp: '(1 . 2)
23:39	blais	I see.
23:40	mmarczyk	there are also setBoolean, setChar etc. methods for primitive types
23:40	blais	So I'd use something like `(~x ~y) instead of a cons cell
23:40	blais	Which makes it tempting to use [x y] instead (but more costly)
23:40	mmarczyk	you'd use [x y]
23:40	mmarczyk	and it is not costly
23:41	blais	Well it creates a vector underneath, no?
23:42	blais	I mean, costly in the sense that vectors will pre-allocate a minimum size, vs. a list
23:42	mmarczyk	'(1 . 2) creates a cons cell underneath
23:42	blais	Or maybe it's not idiomatic to worry about such petty things :-)
23:42	tomoj	if it matters, your program is not doing anything else but this
23:43	tomoj	I mean, it doesn't matter
23:43	blais	a single cons cell is cheap; not sure how that translates for vectors, but them being persistent, I'm guessing parts of them allocated in chunks of 16 or 32 entries.
23:43	mmarczyk	32, yes
23:44	mmarczyk	still, allocating Object[32] is not that expensive, unless you do it excessively often, in which case you might want to consider not using a data structure at all
23:44	tomoj	(list x y) > `(~x ~y) imo
23:45	mmarczyk	if you could pass those things around as function arguments, say
23:45	blais	mmarczyk: in a map where you're consing for every single element the thought of allocating a 32-entry array for each does worry me.
23:46	mmarczyk	of course you can make yourself a classic cons in 1.2, btw, (deftype LispCons [car cdr]) :-)
23:46	blais	It's all relative I guess.
23:46	blais	hahahah
23:46	tomoj	but isn't your map bound by the number of fields in this object?
23:48	seancron	Hi everyone
23:48	seancron	I'm trying to read a csv file, and create a new dataset if the file doesn't exist using Incanter, but my code is behaving weirdly. Can anyone see what I'm doing wrong? http://gist.github.com/485530
23:48	mmarczyk	or if you want to take this a bit further, (defprotocol PLispCons (car [this]) (cdr [this]) (set-car! [this obj]) (set-cdr! [this obj])) (deftype LispCons [^{:volatile-mutable true} _car ^{:volatile-mutable true} _cdr] PLispCons (car [_] _car) (cdr [_] _cdr) (set-car! [this obj] (set! _car obj) this) (set-cdr! [this obj] (set! _cdr obj) this))
23:49	mmarczyk	(car (set-car! (LispCons. 1 2) 5)) ; => 5
23:51	mmarczyk	blais: anyway, don't optimise your code just yet ;-)
23:52	mmarczyk	seancron: weirdly in what way?
23:53	seancron	mmarczyk: I get this error "java.lang.IllegalArgumentException: Wrong number of args (1) passed to: core$assoc" when I type "data" into the REPL
23:53	clojurebot	you mean clojure.main
23:56	defn	im having a hard time (use)ing a library i included as a dependency -- i check out clojure-hadoop*.jar in my lib/ directory, look at the pom and it says org.clojars.choas, artifactID: clojure-hadoop
23:56	defn	however, i can't seem to load this...
23:56	defn	ive tried all sorts of permutations with no luck
23:58	mmarczyk	seancron: could you see if the (dataset ...) form throws the same exception?
23:59	tomoj	defn: does (use 'clojure-hadoop.job) work?