#clojure – 2011-09-21

2011-09-21

04:03	Fossi	i found a bug in the ring cookie parsing (it's simply broken with large cookies). anybody know where i could post the testcase/report?
05:08	thorwil	Fossi: since the github page has no Issues, i guess http://groups.google.com/group/ring-clojure
05:15	Fossi	thorwil: thanks, will post
05:24	fliebel	Doesn't cake understand :source-path?
05:33	michaelr525	hello
05:51	scottj	fliebel: there's a cake channel, #cake.clj I think
06:31	terom	Anybody with experience of different CSV libraries for Clojure or Java; any recommendations what library should I use? There seems to be quite many options available (clojure-csv, data.csv, OpenCSV...)... (I'm beginning to write a small application which is going to read few small CSV files and write data to an XML file.)
06:50	clgv	terom: if you get no other answer try those you found. if those dont suit you, you could also write an own abstraction since CSV is pretty easy structured.
07:51	lnostdal	some user defined macros seem to indent proper, while others do not; i suppose this has something to do with naming .. how does one get slime (clojure-mode?) to indent macros with custom names(?) proper too?
08:05	joegallo	(eval-after-load 'clojure-mode '(add-hook 'clojure-mode-hook (lambda () (put-clojure-indent 'your-macro-here 'defun))))
08:05	joegallo	more or less
08:06	joegallo	that'll handle the indenting, but not highlighting like a keyword (which is nice for macros)
08:07	joegallo	for the highlighting, you'd want a similar callback, or just use the same one, and this inside:
08:08	joegallo	(font-lock-add-keywords 'clojure-mode '(("(\\(your-fn-here\\)" (1 font-lock-keyword-face))))
08:08	joegallo	again, more or less
08:11	Blkt	good afternoon everyone
08:12	mdeboard``	morning
08:13	Blkt	could anyone explain me whythis code always returns nil?
08:13	Blkt	(loop [k '(1 4 7 10 13) acc '()]
08:13	Blkt	(cond (< 2 (count k)) acc
08:13	Blkt	:else (recur (drop 2 k) (cons (take 2 k) acc))))
08:13	opqdonut	since < should be > ?
08:14	mdeboard	,(acc '())
08:14	clojurebot	#<CompilerException java.lang.RuntimeException: Unable to resolve symbol: acc in this context, compiling:(NO_SOURCE_PATH:0)>
08:14	clgv	and it returns '() and not nil ;)
08:14	mdeboard	oh
08:14	Blkt	I suppose that means that I'm a bit tired...
08:14	Blkt	should eat something
08:14	opqdonut	,'()
08:14	clojurebot	()
08:14	mdeboard	So, recur just has to be in the tail position for the loop, not the whole function?
08:15	opqdonut	mdeboard: recur needs to be in tail position wrt. the recur point
08:15	mdeboard	opqdonut: Got it
08:15	opqdonut	which is the innermost loop/function/thing
08:15	mdeboard	thanks
08:15	opqdonut	think of loop just as defining a recursive helper function and calling it right away
08:16	Blkt	thanks for the help
08:16	mdeboard	I don't why I was thinking it had to be in absolute tail position, guess that means taht I'm a bit tired...
08:19	clgv	mdeboard: in the above example it also is in "absolute" tail position provided I interpret that term right
08:19	mdeboard	yeah absolute to the outer context
08:19	mdeboard	outer scope*
08:20	lnostdal	joegallo, thank you!
08:20	clgv	mdeboard: in fact to the whole expression
08:21	mdeboard	clgv: How so? `acc` is in the tail position
08:21	clgv	mdeboard: there are two tailposition due to the branching via cond.
08:22	mdeboard	clgv: Maybe I misunderstand what tail position is then...I'll googe.
08:23	manutter	tail position means that the function does not do any further processing on the results of the call to recur
08:23	clgv	mdeboard: one keypoint is that you are not allowed to modify the result of the recursive call.
08:23	mdeboard	manutter: Ok, I think that's clear enough. I was making it more complicated
08:25	manutter	I suppose I should say "the loop or function does not do any further processing"
08:25	manutter	but that's the main point
08:56	khaliG	is there a good reason to seperate model and view (swing) in clojure?
08:58	manutter	probably.
08:58	manutter	:)
08:58	manutter	Is there something you'd rather do instead of keeping them separate?
09:00	khaliG	manutter, yea, not :) i'm just getting fed up abusing closures
09:01	manutter	I've always heard of MVC in connection with OOP, but I can't see any reason why it would be tied to OOP specifically
09:02	manutter	are you sure it's "abuse" and not "idiom"?
09:04	khaliG	manutter, honestly, I don't see the difference between the two :/
09:04	manutter	Heh
09:04	manutter	If it's your own personal project, might be interesting to experiment with the alternatives
09:05	manutter	if MVC is a valid design principle, then you'll start having problems with changes to your model forcing cascading changes to your views
09:05	manutter	but I have to say in my experience a change in the model tends to have that effect anyway
09:08	khaliG	i might experiment - can't be any worse than what i've got so far :P
09:22	pyninja	Question about clj-http: any reason why `curl https://someurl -d "a=b&c=d&..."` might be different than `(http/post url {:query-params data :headers {"Content-Type" "application/x-www-form-urlencoded"}})`? Curl is working, clj-http is not.
09:24	pyninja	could it be an SSL issue?
09:24	pyninja	dakrone: hey are you around?
09:26	manutter	pyninja: what results do you get from clj-http?
09:26	pyninja	manutter: well i can't really tell what request clj-http is actually making (is there a way to see that?), but I'm trying to send a request to an API (paypal :(), and it's giving an error. But the equivalent curl code is working fine.
09:27	manutter	what's the error?
09:27	pyninja	manutter: i mean it's a paypal error - "timeout processing request". not very helpful...
09:27	manutter	(heh, I'm planning on using clj-http to send a "curlish" request to paypal myself, as soon as I get home, so this is very interesting to me)
09:28	pyninja	heh
09:28	pyninja	i'm suspecting it's an SSL thing probably, since Paypal's PHP sample code seems to be turning off SSL verification.
09:29	pyninja	I wonder if there's a way to disable SSL verification in clj-http...
09:29	manutter	yeah, sounds plausible
09:35	Blkt	how do I create a Double[] from a sequence?
09:35	Blkt	I need to feed it to class method
09:40	clgv	Blkt:## (doc double-array)
09:40	clgv	&(doc double-array)
09:40	clgv	,(doc double-array)
09:40	clojurebot	"([size-or-seq] [size init-val-or-seq]); Creates an array of doubles"
09:41	joly	,(double-array [1 2 3])
09:41	clojurebot	#<double[] [D@1fd9ce4>
09:41	clgv	,(seq (double-array [1 2 3]))
09:41	clojurebot	(1.0 2.0 3.0)
09:42	Blkt	thanks a lot clojurebot
09:42	Blkt	er...
09:43	Blkt	thanks a lot clgv
09:45	clgv	Blkt: there are more like this for e.g. int
09:45	pyninja	manutter: so yeah it looks like actually ssl is not the issue. i enabled ssl verification in their php sample code, and it still works.
09:46	Blkt	clgv: I just noticed it by M-. double-array
09:48	manutter	pyninja: I'll have to play with it tonight when I'm at my main clojure pc
09:49	clgv	manutter: "clojure mainframe" ? ;)
09:49	manutter	heh, just about :)
09:49	choffstein	Does anyone here use JodaTime or clj-time? I'm having serious issues trying to parse strings that have time-zones … which JodaTime says it can't parse
10:03	khaliG	choffstein, yes, do you have an example pasted somewhere?
10:04	choffstein	Nothing complex. Basically, I have getting strings that are in "E MMM d HH:mm:ss zzz yyyy" format, but when I try to createa custom formatter and then parse a string in that format, clj-time crashes with a "can't parse Time Zone"
10:05	choffstein	(use '[clj-time.format]) (def custom-format (formatter " MMM d HH:mm:ss zzz yyyy")) (parse custom-format "Wed Sep 21 00:00:00 EST 2011")
10:06	dbushenko	which is the most correct way to start slime session: slime-connect or clojure-jack-in?
10:06	choffstein	Err, (formatter "E MMM d HH:mm:ss zzz yyyy")
10:06	manutter	dbushenko: depends if you've done "lein swank" at the command line
10:07	manutter	clojure-jack-in starts swank for you
10:07	dbushenko	manutter, I don't use emacs-starter-kit, so probably my clojure-mode differs a bit
10:07	dbushenko	but when I try to connect with slime-connect
10:08	dbushenko	emacs doesn't open the repl
10:08	dbushenko	clojure-jack-in opens the repl and works fine
10:08	dbushenko	what's wrong with slime-connect?
10:09	manutter	dbushenko: I don't use emacs starter kit either, just clojure mode and swank-clojure
10:09	manutter	are you starting swank with lein swank or something equivalent?
10:09	scottj	dbushenko: did you start swank with lein swank?
10:09	dbushenko	manutter: what package manager and clojure-mode version do you use?
10:09	dbushenko	scottj, sure
10:10	manutter	I'm not sure, but the latest version of each, as far as I know
10:10	dbushenko	manutter, yep, but there are different package managers for emacs, as I know
10:10	dbushenko	which one do you use?
10:10	manutter	do you have a swank buffer in emacs? Might be some interesting info there if so
10:10	scottj	dbushenko: look in Messages or slime events etc for some error message
10:11	dbushenko	manutter, no, swank doesn't open
10:12	dbushenko	scottj, Connecting to Swank on port 4005.. [2 times]
10:12	dbushenko	error in process filter: slime-intern-indentation-spec: Wrong type argument: listp, 1
10:12	dbushenko	error in process filter: Wrong type argument: listp, 1
10:12	dbushenko	seems like this is all of the errors
10:13	manutter	hmm, yeah, sounds like some kind of version conflict between different libraries.
10:14	dbushenko	so which versions do you use?
10:15	manutter	I basically wiped out my old stuff and followed the instructions at https://github.com/technomancy/swank-clojure
10:15	dbushenko	technomancy, hi, I do exactly as described in https://github.com/technomancy/swank-clojure
10:15	dbushenko	but only clojure-jack-in runs, slime-connect doesn't open the repl
10:16	dbushenko	is that ok or I've done something wrong?
10:16	dbushenko	manutter, OMG, I did exactly as described there....
10:16	dbushenko	what could that be?
10:17	manutter	hmm, I'm running out of clues, my only guess is maybe some old libs still hanging around inside .emacs or .emacs.d?
10:18	scottj	M-: (slime-changelog-date)
10:19	scottj	actually not sure if that works with elpa version of slime
10:19	dbushenko	ok, thank you guys, I'll try emacs 24
10:19	dbushenko	bye!
10:23	khaliG	choffstein, yeah i see what you mean. Perhaps you might parse the date without the EST and then convert it to the correct TZ using to-time-zone?
10:23	choffstein	khaliG: That might be an option, but I don't think the string will parse since I have the time zone in there. I suppose I could split the string using space as a sep, remove the time-zone element, and smush it back together -- then parse. But that seems … ugly
10:25	khaliG	choffstein, yep you'd have to preprocess the string before hand, agreed it's not as nice
10:27	choffstein	khaliG: i'll give it a whirl. might not be sexy, but it might get the job done
10:28	khaliG	choffstein, sounds good :)
10:29	bsod1	hi, I'm trying to install counterclockwise eclipse plugin for clojure development but I'm getting this error message: http://paste.pocoo.org/show/479913/ (on eclipse indigo) . can anyone help me?
10:29	clojurebot	clojure bot is not immune to ,(iterate inc 0)
10:32	terom	bsod1: make sure you're using the correct update site (http://ccw.cgrand.net/updatesite)
10:34	terom	Wiki page for installation has some older update site which is not in use, probably
10:34	bsod1	terom: great, thanks
10:48	clgv	bsod1: yeah 0.3.0 is latest CCW version
10:48	bsod1	clgv: is it compatible with eclipse indigo? repl is not working. also clojure perspective is not added.
10:49	clgv	bsod1: yes I have CCW 0.3.0 workin on 3 machines with eclipse indigo
10:49	clgv	no special magic was need to get it running
10:50	bsod1	clgv: ok I'm installing again
10:50	clgv	if you have any old version, get rid of it before installing the new one
10:50	bsod1	no I didn't have any old versions
10:53	scottj	can protocol methods have vargs?
10:53	choffstein	Anyone know a way to drop the nth item in a sequence?
10:53	choffstein	I suppose I could index the items then filter … but that just seems ugly
10:54	clgv	scottj: no they cant
10:54	pdk	(doc drop-nth)
10:54	clojurebot	It's greek to me.
10:54	clgv	but you dont get an error in clojure 1.2 and the '& is interpreted as param name
10:55	scottj	clgv: ty
10:57	choffstein	alright. gotta run. have a good one everyone
10:59	bsod1	clgv: I've uninstalled and installed again but still same, can't run REPL and clojure perpective isn't added
11:00	clgv	bsod1: so what did you do after installing? did you create a clojure project?
11:00	bsod1	yes
11:00	manutter	bsod1: other plugins installed?
11:00	bsod1	manutter: no, just standart eclipse indigo
11:01	bsod1	manutter: erm, and viPlugin
11:01	clgv	bsod1: there is no clojure perspective yet, but there are several views
11:01	clgv	bsod1: you'll get a repl by running a clojure file of your project
11:02	bsod1	clgv: wait, I opened REPL view and can run commands now
11:02	bsod1	clgv: ok ok, I think all I need was to open a REPL view. but it still strange that when I run "load this file to REPL", I get an error message
11:03	bsod1	clgv: also, is there a way to disable rainbow parens?
11:04	clgv	bsod1: why would you want to disable coloring of parens?
11:05	clgv	whats the error message? the ctrl+alt+s works well here
11:05	bsod1	clgv: looks bad, it already highlights it's pair when I move cursor on to a paren
11:06	bsod1	clgv: hmm, looks like after opening REPL view, ctrl+alt+s works
11:07	bsod1	clgv: do you know any must-know hotkeys for counterclockwise? like `show documentation`?
11:07	clgv	ctrl+alt+n is useful to switch the repl to the namespace of the file you are in (when changing the file after starting the repl)
11:09	TimMc	C-M-n, you mean
11:09	kzar	If you're dealing with large XML files what's a sensible way to go about it? Just clojure.xml/parse and then map over it? I tried using clojure.xml/parse and it seems to take absolutely ages - the file is 5 megs though.
11:10	clgv	bsod1: the outline view is also nice
11:10	bsod1	clgv: can you look at my REPL view? something wrong, it's not working http://ompldr.org/vYWduNg/counterclockwise.png
11:10	clgv	TimMc: no I do not
11:11	TimMc	You don't?
11:11	clgv	bsod1: seems you killed the nrepl server. the view still stays alive
11:12	clgv	bsod1: you kill the nrepl server via the "terminate" button in the console view, but that doesnt close the repl view
11:14	clgv	bsod1: solution => just close the old view and restart a repl
11:17	kzar	Oh it looks like this might do what I want. https://github.com/marktriggs/xml-picker-seq
11:18	simard	I have a function f1 that should take a list as argument and apply a function f2 to its elements, only if the element is a {}. if the element is itself another list, it should instead call f1 on it. what's the most idiomatic way of doing that ?
11:19	clgv	simard: examples! got a knot in my head reading the description
11:23	simard	ok: (draw (list {:a 1} (list {:a 2} {:a 3}) {:a 4})) should yield (f2 {:a 1}), (draw {:a 2} {:a 3}) and (f2 {:a 4})
11:23	simard	and that draw should yield (f2 {:a 2}) (f2 {:a 3})
11:24	bsod1	clgv: I've tried reopening REPL view but didn't work, I restarted eclipse and still the same, something wrong with this REPL view
11:27	clgv	bsod1: no. you have to restart a repl! not the view.
11:28	joly	simard: maybe something like (defn draw [xs] (doseq [x xs] (if (map? x) (f2 x) (apply draw x))))
11:28	clgv	bsod1: the view is only a nrepl client which needs an nrepl-server that is started when you do ctrl+alt+s or F9 (run) in a file
11:30	bsod1	clgv: do you mean this? http://ompldr.org/vYWducA
11:30	manutter	eclipse is too complicated, I'm sticking with something easy like emacs.
11:30	clgv	manutter: roflmao!
11:30	Bronsa	lol manutter
11:31	manutter	sry, couldn't resist :)
11:32	clgv	bsod1: just close that repl view, go to the console view and terminate all running processes. then click into your test1.clj and select "run" from the menu
11:32	simard	joly: hum that doesn't actually build a tree out of the return values of draw does it ?
11:32	simard	it's just for side effecs
11:32	simard	effects*
11:33	joly	can change doseq to for if you want the results back
11:33	bsod1	clgv: I have nothing in console view :)
11:33	joly	simard: ^
11:33	simard	oh :)
11:33	simard	thank you
11:33	joly	sure thing :)
11:34	bsod1	clgv: do you want a screenshot :)
11:34	clgv	bsod1: ah hm. your source folder is displaying an error. you should have a look at that
11:34	bsod1	clgv: really? it's a java project(actually java standart api source code from oracle JDK)
11:34	clgv	bsod1: what? didnt you create a clojure project?
11:35	bsod1	clgv: clojure_test project is clojure project, and test1.clj is in it
11:35	clgv	bsod1: ah k that is another project :P
11:36	bsod1	clgv: :) I just created a new clojure project and now everything is working :) I think the problem was when I remove counterclockwise to reinstall, something went wrong about old project
11:37	bsod1	clgv: thanks
11:37	clgv	bsod1: yeah I guess there is no backwards compatibility between 0.0.64 and 0.3.0 ;)
11:42	simard	shouldn't that produce a multiline string with numbers from 1 to 10 ? (with-out-str (map println (range 1 10)))
11:42	clgv	,(with-out-str (map println (range 1 10)))
11:42	clojurebot	""
11:43	simard	,(with-out-str (println 10))
11:43	clojurebot	"10\n"
11:43	clgv	simard: ah lol. the lazy map gets evaluated outside the with-out-str
11:43	clgv	,(with-out-str (doall (map println (range 1 10))))
11:43	clojurebot	"1\n2\n3\n4\n5\n6\n7\n8\n9\n"
11:44	simard	clgv: even when I enclose it with a (spit ...), it doesn't work
11:44	clgv	simard: it only prints to the string within the with-out-str form but the evaluation of the lazy map does not take place in there
11:44	simard	oh
11:45	simard	makes sense
11:45	simard	tricky :)
11:45	clgv	,(doall (with-out-str (map println (range 1 10))))
11:45	clojurebot	""
11:45	clgv	see above ^^
11:45	clgv	simard: you can use doseq for side effects
11:46	clgv	,(with-out-str (doseq [i (range 1 10)] (println i)))
11:46	clojurebot	"1\n2\n3\n4\n5\n6\n7\n8\n9\n"
11:49	simard	is there a function that combines (doseq) and (flatten) ?
11:49	simard	like... dotree
11:50	clgv	simard: not that I know of. just put the flatten call where range was in the example
11:50	clgv	or do you need traversing in a certain order?
11:51	simard	clgv: linear order, so flatten will do
11:51	kzar	I've added [org.clojure/clojure.contrib "1.2.0"] to my deps in project.clj but now `lein deps` is failing to grab the pom. Pretty sure I'm doing it right, any ideas?
11:52	clgv	kzar: [org.clojure/clojure-contrib "1.2.0"]
11:52	clgv	minus instead of dot
11:52	kzar	ah balls, thanks clgv
11:53	hugod	anyone know of a way to get the current test var within an :each fixture in clojure.test?
12:11	Blkt	cya tomorrow everyone
12:13	jli	I have a file with tens of thousands of lines in it, each line is short (say <50 chars). I'd like to build an index from each line in the file to the line number. I have something, but it seems slow
12:14	jli	basically: (zipmap (line-seq (clojure.java.io/reader file)) (map inc (range)))
12:19	clgv	jli: what will you do with the index?
12:19	kzar	How do you have `lein deps` grab Java libraries that aren't hosted on Clojars?
12:19	kzar	I wanted to use nu.xom.Document
12:20	clgv	kzar: you can specify repositories, see the example on leiningens github page
12:22	joegallo	i think that you won't even need to do that, xom is already on maven central, which i'm pretty sure is in the list of default repositories
12:23	joegallo	but i could be wrong, of course
12:23	clgv	joegallo: might depend on the leiningen version.
12:24	joegallo	good point
12:24	clgv	but I think I remember it being on the list
12:25	clgv	I got swingx via mavencentrel
12:25	joegallo	seems to work as i thought here with leiningen 1.6.1
12:28	clgv	Ihave 1.6.1.1
12:34	arohner	repo support was added to lein a long time ago, like 1.3 or 1.4, you should have no problems with that
12:34	arohner	kzar: make sure your dependency is written correctly, that's where most problems occur
12:37	kzar	arohner: Yea I just had no idea how to go about it. Thanks to the tips I've made a bit of progress though, I found it on the maven core website and from that could add it to my project file
12:38	joegallo	http://mvnrepository.com/
12:38	joegallo	i usually just search for the library name here, and it spits out something usable, the 75% of the time the website is up at all
12:57	zippy314	in clojurescript, whats the right way to convert a string to an integer?
12:58	malkomalko	hey all, is there a way to force a reload of your clojure files in a repl? I know you can do a specific ns by adding :reload, but is there anyway to reload all dependencies of a file?
13:02	hugod	:reload-all
13:05	malkomalko	wonderful!
13:14	dnolen	zippy314: js/parseInt, Google Closure probably has something as well.
13:14	zippy314	dnolen: thanks! I just figured out the js namespace. Not very well documented!
13:22	simard	I need to have a global variable point (a [x y] couple) that I want to change from within a few select functions, what is the best strategy to use here ? a ref ?
13:23	simard	ie.: it seems vars won't do because I don't want lexical scope binding but permanent change of the value stored in point
13:23	drewr	an atom may suffice
13:23	drewr	no earmuffs
13:26	hiredman	or even better, pass in the function you need to where you need it
13:27	hiredman	(binding [function-to-map inc] (map (range 10))) ;; kind of silly
13:27	srid	i ran (run-jetty ...) on REPL (emacs swank), and now it hangs for ever. is it possible to interrupt this function alone, without restarting swank?
13:27	hiredman	C-c C-c
13:27	srid	alternatively, is there a way to launch the server and return immediately.
13:27	hiredman	yes
13:27	hiredman	read the docs for the function
13:27	srid	that works, thanks
13:30	srid	:join? and defonce will work, http://stackoverflow.com/questions/2706044/
13:34	hiredman	srid: having a (defonce server (run-jetty ...)) in the middle of your source file is a bad idea, means jetty will be launched anytime the file is evaled/compiled
13:35	hiredman	you should have a function that starts the server, and just call that function at the repl when you want to start a server
13:36	srid	hiredman: i defonce in repl. but now i'm inclining to use ring's "ring server"
13:36	hiredman	from lein ring?
13:36	srid	yes
13:36	hiredman	it's a nice plugin
13:36	srid	it auto restarts on file change.
13:39	srid	here's my simple aleph http server (wrapped in ring) https://gist.github.com/1232768 - it is throwing an IllegalArgumentException (No implementation of method: :consumer of
13:39	srid	; protocol: #'lamina.core.channel/ChannelProtocol found for class: nil) ... any idea why?
13:40	hiredman	I imagine protocols don't play nice with lein-rings reloading
13:51	srid	hiredman: seems so. not using lein-ring fixes the issue
13:51	srid	hiredman: is there a workaround, so I can still use lein-ring? (i haven't read about protocols and records yet)
13:53	hiredman	not really
13:58	srid	the streaming requests example from aleph doesn't work at all.
13:59	srid	maybe i should stop relying on beta software to get something up and running today
14:21	zippy314	here's a closure issue with clojurescript. Check out this simple example https://gist.github.com/1232866 which adds in some new elements and (I thought) a listener for each of them which responds differently depending on which one is clicked. What actually happens is that the value of hid in the anonymous function will simply be the last value from the doseq list. Is this a bug in clojurescript?
14:23	manutter	zippy314: no, that's plain old js closure
14:23	manutter	you need a function that takes hid as an argument, and returns the anonymous function you've got there
14:28	zippy314	manutter: Hmm yah. I just updated the gist with what you said and it works. But shouldn't the clojurescript compiler detect this case and insert an anonymous function like that?
14:29	manutter	you might not always want it to :)
14:32	manutter	the compiler is behaving correctly, you just have to understand function scope and how to use it
14:32	manutter	since hid was a var outside the scope of the anonymous function, all the anonymous functions you created referred to the same "hid"
14:33	manutter	by making a function that took hid as an argument, and returned an anonymous function, each anonymous function got its own unique value of hid
14:34	pandeiro	Should ClojureScript always follow the prototype chain when dealing with objects with inherited properties and methods?
14:35	pandeiro	I want to call preventDefault on an event but it's saying the method doesn't exist
15:20	carllerche	is there anyway to dispatch a protocol on a byte array?
15:21	kjeldahl	Anybody have any pointers to using jdbc with a persistent connection, i.e. not using with-connection, but rather some variant of get-connection?
15:25	kjeldahl	Never mind; with-connection uses get-connection, and I guess a "top-level" with-connection neatly solves it.
15:25	dnolen	carllerche: yes, http://dosync.posterous.com/51626638
15:32	carllerche	dnolen: huh that's interesting
15:32	carllerche	you can extend types at runtime? i did not know that
15:37	ibdknox	dnolen: I have bad news on the cljs perf front
15:40	mattmitchell	anyone here use midje?
15:41	fdaoud	mattmitchell: have took it for a spin but that's it
15:42	khaliG	so i'm using (fn [&{:keys [...]}] for keyword arguments and wondering if there is a way to access the arguments programatically inside the function, something like (doseq [a args] (if a ...)) - is this possible?
15:42	mattmitchell	fdaoud: what'd you think?
15:43	fdaoud	mattmitchell: looks nice, will go back to it but for now clojure.test satisfies my needs
15:43	mattmitchell	fdaoud: cool thanks
15:49	dnolen	ibdknox: what in particular? I've done a few tests myself.
15:49	ibdknox	dnolen: iterating over anything is incredibly slow
15:49	ibdknox	dnolen: as in 3-4 orders of magnitude slower than native JS
15:50	fdaoud	mattmitchell: have you tried it?
15:51	dnolen	ibdknox: ah yeah, to be expected at this point - 3-4 orders slower doesn't really make much of a difference when you're dealing w/ common client side JS operations.
15:51	mattmitchell	fdaoud: Yes we use it for all of our tests. I'm curious to see if others are using it, and what their experiences are.
15:51	ibdknox	dnolen: matters if you want to do any canvas rendering
15:51	dnolen	ibdknox: that said I think there's a place for amap, areduce, etc. in ClojureScript which compiles down to more efficient operations.
15:52	fdaoud	mattmitchell: interesting. do you do mocking with it? that would be my primary interest.
15:52	dnolen	ibdknox: could that be solved for your usecase w/ amap/reduce ?
15:52	the-kenny	Aren't closures supported in ClojureScript? I see the following behavior in repljs: https://gist.github.com/1233113
15:52	mattmitchell	fdaoud: we do yes, works pretty well actually
15:53	ibdknox	dnolen: an efficient doseq would cover everything for me
15:53	ibdknox	dnolen: the one other place it would be nice amap would be perfect
15:53	fdaoud	mattmitchell: great, thanks
15:53	dnolen	the-kenny: you're just seeing a oddity of REPL output, that works as advertised.
15:54	kjeldahl	Using the jdbc with-connection (which closes connection after executing) seems terribly inefficient. Any better methods, or hints about why my assumption is wrong?
15:54	the-kenny	dnolen: Ah, okay :) Thanks
15:54	fdaoud	kjeldahl: use a connection pool perhaps?
15:56	joegallo	yeah, seriously, get c3p0 or something behind it and you'll be rockin'
15:57	kjeldahl	fdaoud: Pointers? I'm finding something about apache dbpc, but that's yet another abstraction, which need yet another clojure interface I guess. Anything simpler (reusing a single connection or similar, disregarding obvious challenges about synchronizity which may or may not be handled by the driver)?
15:58	kjeldahl	Easier than I though I guess: https://gist.github.com/470904
15:59	fdaoud	kjeldahl: like joegallo I'd recommend c3p0 http://www.mchange.com/projects/c3p0/index.html
15:59	dnolen	ibdknox: looking at the implementation of ISeq for arrays. Have you benched loop/recur ?
15:59	ibdknox	dnolen: not yet, does it look like it might be more efficient?
16:03	dnolen	ibdknox: yes it looks more efficient, one things that's missing for ClojureScript to be really fast for Canvas like stuff is inlining.
16:04	kjeldahl	fdaoud/joegallo: Thanks, I will have a look at it. It does seems that dbcp has some clojure hand-holding already however; http://clojars.org/org.bituf/clj-dbcp , but if c3p0 is the way to go in the java world I guess I need to look into it.
16:04	dnolen	worth bringing up on the ML to see if we can move forward on that, especially since you could benefit from it now.
16:05	ibdknox	dnolen: yeah
16:06	ibdknox	dnolen: I'll throw together some stuff on my findings.
16:07	dnolen	ibdknox: that would be awesome.
16:09	dnolen	ibdknox: actually doseq expands to loop/recur so I think you're paying for the indirection of function calls when you really want inlining.
16:10	ibdknox	dnolen: yeah, that's what I assumed was killing me. I think a single (doseq [n [1 2 3]] ) ends up making a ridiculous number of function calls
16:10	ibdknox	all done with apply, which I believe slows it down even more
16:11	dnolen	ibdknox: hmm I'm not so sure about the apply part.
16:11	ibdknox	dnolen: to give you an idea of what I was seeing, a for loop in native JS over 1,000,000 elements took 1-4ms to complete
16:11	ibdknox	dnolen: in cljs it was around 3.5-4s
16:12	dnolen	ibdknox: I know, I've seen the same things. I've been focusing on DOM related things so those things haven't bothered me much yet.
16:12	dnolen	you can't even write keys in localStorage faster than 5000 kv pairs / sec :P
16:12	ibdknox	lol
16:13	ibdknox	well, perhaps a less contrived scenario was me trying to render tiles in a game. only 144 elements, but it was taking longer than the render-loop's execution time
16:19	choffstein	Anyone want to test a lein plugin I wrote? :D https://github.com/newfoundresearch/lein-clj-doc-test
16:19	dnolen	ibdknox: the challenge here is that we can't just inline the function + into something better like you can on the JVM (which eliminates the method call overhead quite well) ...
16:21	ibdknox	dnolen: I know.. I thought a little bit about it and I think this is actually going to be really complicated to solve. I'm not entirely sure the solution exists at the CLJS compiler level. I think it might actually have to be a pass over the generated JS itself, which would be a lot of work
16:21	dnolen	ibdknox: nah, we just need to find out how disdained js* really is.
16:21	ibdknox	lol
16:22	dnolen	ibdknox: if it is disdained then something else is needed that accomplishes what it does.
16:23	Raynes	cemerick: I didn't know you were doing another fundraiser! Cool stuff.
16:23	ibdknox	dnolen: So your thought is for certain constructs (loops in this cases), we explicitly write the JS it should output?
16:23	Raynes	I'm surprised I missed all the tweets about it.
16:24	dnolen	ibdknox: no doseq does the correct thing.
16:24	dnolen	what's wrong is that artithmetic primitives are fn calls and not inlined into JS +, -, /, *, <=, etc.
16:26	cemerick	Raynes: Yup; seemed like something worth repeating, as much as that's possible. :-)
16:27	cemerick	putting it out there during the conf ended up not being a fantastic idea.
16:27	cemerick	There was only one way to see what would happen, tho.
16:30	dnolen	speaking of which please all, retweet this - https://twitter.com/swannodette/status/116610530575269888
16:30	dnolen	cemerick: ^
16:31	cemerick	dnolen: thanks :-)
16:33	renjikken	I have installed clojure and clojure.contrib via aptitude and am able to run clojure via the 'clojure' command (not using java -cp ...). When I try to (ns mynamespace (:require clojure.contrib.X)) I'm told clojure.contrib isn't in my classpath. How can I fix this?
16:33	ibdknox	dnolen: Inlining those would definitely help, but I don't think those operations are the limiting factor in the loops
16:35	ibdknox	renjikken: your life will be much easier if you use leiningen: https://github.com/technomancy/leiningen
16:35	dnolen	ibdknox: what else would be the problem?
16:35	ibdknox	dnolen: I'll try to dig into it and find out :)
16:36	scottj	did rich's strangeloop talk have very many slides?
16:38	cemerick	A fair number. Maybe more than usual, even.
16:40	Raynes	I wish I could pull off a talk with one slide and one bullet point.
16:40	Raynes	Don't think that'll work out this go around though.
16:41	scottj	https://github.com/strangeloop/2011-slides if anyone's interested (no dnolen or rhickey yet though)
16:42	renjikken	Yeah... ibdknox you've really only introduced a lot more complexity to my problem here.
16:43	theignorati	how do I set POST data with clj-http? :#
16:43	scottj	renjikken: that clojure command is non-standard most likely very few here use it
16:43	scottj	renjikken: or have a clue how it works/accepts changes to classpath
16:43	ibdknox	renjikken: heh. Lein makes it very easy to handle your classpath.
16:44	ibdknox	renjikken: how are you running clojure? Just with java -jar?
16:44	renjikken	ibdknox: That's great but that means I have to learn a whole new tool first. It'd be pretty swell if you could actually tell me something I could do _now_ so I can get my homework done _tonight_. :)
16:44	renjikken	No. As I said in my first message, with just 'clojure'.
16:44	ibdknox	lol
16:44	ibdknox	passive agressive much?
16:44	scottj	ibdknox: it's probably a debian only script
16:44	ibdknox	I'm trying to help you.
16:45	scottj	renjikken: install lein it takes 5 minutes
16:45	renjikken	Yes I believe I've done that.
16:45	renjikken	Though I'm now forced to look through this Lein to manage my classpath instead. Not any closer to a solution as far as I can see.
16:45	ibdknox	renjikken: project.clj
16:46	ibdknox	renjikken: add clojure.contrib as a dependency.
16:46	renjikken	ibdknox: whatdoesthatevenmean.py
16:46	arohner	kjeldahl: I saw an 8x perf improvement by switching from dbcp to c3p0
16:46	arohner	kjeldahl: and the code to set up the DB connections halved
16:46	ibdknox	renjikken: Good luck with your homework then :)
16:46	TimMc	renjikken: Try installing not-acting-like-an-entitled-asshat.deb
16:47	theignorati	.jpg.exe
16:47	icey	renjikken: what timmc said, but you might have to use sudo first… i.e. "sudo not-acting-like-an-entitled-asshat.deb"
16:47	renjikken	I'd be happy to as soon as someone would like to try actually answering my question rather than throwing names of things I don't know at me.
16:47	scottj	renjikken: have you read the readme? https://github.com/technomancy/leiningen
16:48	renjikken	I have looked at it a little, scottj. We've never actually worked with java before (crazy, right?) though, so I'm not familiar with the org.clojure stuff (which is some java convention?).
16:49	ibdknox	renjikken: from a terminal: lein new my-project
16:49	ibdknox	cd my-project
16:49	scottj	not important
16:49	ibdknox	vim project.clj
16:50	scottj	renjikken: or rather, dependencies have 3 main parts, group (who made them), artifact (name of the lib), and version. org.clojure is the group part
16:50	ibdknox	make your dependencies look like this: https://github.com/ibdknox/sudoku-solver/blob/master/project.clj
16:51	ibdknox	lein deps
16:51	ibdknox	you're done
16:54	theignorati	is there a http client lib with proper docs?
16:54	cemerick	Gosh, if only Clojure were easier.
16:56	theignorati	found one
16:57	scottj	theignorati: which one?
16:57	theignorati	clj-apache-http
16:57	renjikken	Alright. It seems to have worked. Do I have to install the dependencies every time I make a project, though? Or is that not what it was doing?
16:57	zerokarmaleft	you configure project deps on a project by project basis
16:57	scottj	renjikken: it downloaded them to ~/.m2 it will copy them from there into each new project's dir by default
16:59	renjikken	I see. Alright. Thanks for the help.
17:00	zerokarmaleft	renjikken: https://github.com/technomancy/leiningen/blob/1.x/sample.project.clj <= technomancy went to the effort of commenting the hell out of this
17:00	renjikken	Right on.
17:00	zerokarmaleft	or maybe it was someone else
17:01	zerokarmaleft	anyway, that's super useful
17:01	renjikken	It certainly will be. Thanks.
17:03	zerokarmaleft	i detect an edge of surliness there
17:32	kij	Is there an way to move forms around in vim? pretty sure i used something for emacs back in the days, just cant remember the name :/
17:33	grim_radical	when using defmethod, where in the declaration would one place a docstring?
17:34	scottj	grim_radical: maybe only in defmulti
17:34	cemerick	grim_radical: defmethod doesn't actually intern a new var, so there'd be no place for docs to go
17:35	grim_radical	cemerick: ah, ok
17:35	scottj	kij: it's called paredit in emacs, I think there's a minimal port to vim
17:36	kij	scottj: thanks, ill have a google.
17:36	ibdknox	kij: ya( ca(
17:36	ibdknox	there are text objects for parens :)
17:37	ibdknox	kij: ci( would change everything inside of a paren pair
17:47	kij	this is what i was looking for: https://github.com/vim-scripts/slimv.vim/blob/master/plugin/paredit.vim
17:59	dnolen	ibdknox: hmm, I wonder if limiting the the use of js* to :inline metadata would be enough ...
18:02	ibdknox	dnolen: that sounds reasonable to me
18:37	ozataman	hi all. I'm having some trouble getting emacs play with clojure. c-x c-e says no lisp sub-process; s-c s-z says no such file or directory, lisp. not sure where to go from here...
18:38	ozataman	I have package, clojure-mode, slime, slime-ritz installed.
18:38	scottj	ozataman: lein project? M-x clojure-jack-in
18:38	ozataman	scottj: it's just a single file I wanted to use for experimenting/learning
18:38	scottj	ozataman: ok not sure anyway if clojure-jack-in works with ritz
18:39	scottj	ozataman: so have you started ritz (or swank)?
18:39	scottj	ozataman: btw do you know why you're using ritz or did you just install it because it had slime in the name?
18:42	scottj	ozataman: btw if you don't need slime/swank you could do C-u M-x inferior-lisp java -cp pathtoclojure.jar clojure.main that would give you C-x C-e
18:46	ozataman	scottj: sorry, was pulled away for a bit. not sure if I have started ritz. the only reason I installed that is because I saw in some post that it is what you need for slime. I'm pretty new to all this, so not sure what the right setup is to get even a simple clojure-emacs setup.
18:46	scottj	ozataman: ritz is sweet but I'd hold off on that till later
18:46	ozataman	I first tried swank, then saw ritz succeeded it as a project, so switched
18:47	scottj	ozataman: best install lein first create a play project then follow https://github.com/technomancy/swank-clojure instructions and use clojure-jack-in
18:50	ozataman	scottj: I tried that as well. still having the problem. I created a new lein project, got in the core.clj inside the project, did the jack-in and c-x c-e is still not working.
18:50	scottj	did jack in bring up a slime repl
18:51	ozataman	no, the minibuffer "starting swank..." message just goes away after a while
18:51	scottj	well you still have slime-ritz installed?
18:52	scottj	btw you can try lein swank in term then M-x slime-connect
18:52	ztellman	srid: were you able to get something up and running with the changes suggested on the mailing list?
18:52	ozataman	scottj: I deleted slime-ritz from the elpa folder and restarted emacs
18:52	ozataman	let me try that
18:52	scottj	ztellman: just read through your slides, thanks for sharing
18:53	ztellman	scottj: I hope they make sense without my color commentary
18:53	ozataman	scottj: slime-connect seems to have worked but I don't see a repl. just some feedback on the minibuffer when I do c-x c-e
18:54	ztellman	according to alex miller, it may be several months before the video is released
18:54	scottj	last time that was the case it showed up on infoq
18:55	scottj	ztellman: the psuedocode was just that right, not a real language?
18:56	ztellman	scottj: yeah, just pseudocode
18:56	scottj	ozataman: the repl normally comes up at the slime-connect not when you do C-x C-e, loook for buffer slime-repl clojure
18:56	ozataman	scottj: don't have one. is slime-repl something I need to install? package-install gives an error when I try that.
18:57	ozataman	scottj: also, is slime-clj needed?
18:58	scottj	ozataman: no to slime-clj, not sure on slime-repl that could be why you're not seeing it
18:59	srid	ztellman: i will take a look, but i fixed that problem by not using lein ring (which is not idea) ... now, I can't get the streaming example working. the browser (and curl) is forever "loading" that page
18:59	srid	oh, aleph requires netty, I see
18:59	scottj	ozataman: anyway if you're happy with C-x C-e you don't need the repl :)
19:00	ztellman	srid: you need to start the server using aleph.http/start-http-server
19:00	srid	ztellman: yea, I did that.
19:00	ozataman	scottj: well, repl would be nice :) I'm just trying to get the hang of it all
19:00	srid	ztellman: i can paste my program if you want
19:00	ztellman	yeah, please do
19:00	ozataman	scottj: ahha, slime-repl was the reason. I have a repl now!
19:02	srid	ztellman: just a moment, i'm currently registering for clojure/conj :)
19:02	ztellman	srid: no rush
19:02	ozataman	scottj: thank you
19:10	ozataman	scottj: on a swank buffer, I see "sh: line 1: lein: command not found" after tyring clojure-jack-in. any idea how I can get aroudn this?
19:21	ztellman	srid: I'm going to step out for a bit
19:21	ztellman	if I copy/paste the example into a command-line repl, it works fine
19:22	ztellman	using a lein swank repl seems to screw up future calls, though
19:22	ztellman	so if you're using swank, try replacing the future call with (.start (Thread. #(… ))
19:34	technomancy	(fixed in lein 1.6.1.1)
19:40	srid	technomancy: coming to clojure/conj this year?
19:41	technomancy	srid: fer sher
19:44	srid	this will be my second conference. i broke my leg at the first.
19:46	technomancy	better luck this time
19:51	ozataman	is it normal for slime-repl to crash on a wrong type argument?
19:51	technomancy	can't say that it is, no
19:52	ozataman	it makes emacs freeze for ~45secs and then recovers
19:52	ozataman	I keep seeing a blinking white square at the middle of the screen
19:52	technomancy	hmm; never heard of that before
19:54	ozataman	very strange; commands are all garbled up now. can't do much unless I restart emacs
19:55	ozataman	several of these got posted in the messages buffer: error in process filter: Wrong type argument: characterp, nil
19:56	technomancy	that's an elisp bug
19:56	ozataman	any several functions got unbound - I can't even list buffers, etc.
19:57	technomancy	wow
19:58	amalloy	ozataman: blinking white square in the middle sounds like the visible bell
19:58	ozataman	whatever I try - like c-x c-b, I keep getting the same error: define-key: Wrong type argument: characterp, nil
19:58	ozataman	amalloy: I see - I thought I had disabled it; started seeing it again after installing the starter-kit
19:58	technomancy	oh, I thought you said it became unbound
19:59	ozataman	it's almost like the error I caused through slime-repl got stuck
19:59	ozataman	technomancy: sorry, still new to both emacs and lisp. pardon my lack of proper terminology.. trying to get there :)
20:02	technomancy	the only elisp package required to use M-x clojure-jack-in is clojure-mode
20:02	technomancy	you can try removing the others; some of them are known to be incompatible (slime-clj) and seeing if you can repro
20:03	ozataman	ok, will try
21:47	choffstein	Anyone know a good clojure or java library that can perform a minimization of a given function?
21:47	choffstein	So, likely, a math library. Incanter doesn't seem to have what I need
22:36	quotemstr	Can Clojure run as an applet?
22:38	amalloy	quotemstr: it should certainly be possible. but it might need to be an applet with more privileges than the built-in sandbox: for example, it probably needs permission to install a new classloader
22:38	quotemstr	amalloy: Thanks.
22:39	amalloy	and clojurescript is more "hip" for client-side execution of clojure, at the moment
22:40	quotemstr	amalloy: Of course, but if I need to write an applet to use some API anyway, I might as well use Clojure to write it.
22:53	nkoza	why this don't work? (binding [get #(+ %1 %2)] (get 4 5)) ? I see "get" as a Var like anyother
22:54	hiredman	,(meta #'get)
22:54	clojurebot	{:ns #<Namespace clojure.core>, :name get, :file "clojure/core.clj", :line 1387, :arglists ([map key] [map key not-found]), ...}
22:54	hiredman	,(:inline-arities (meta #'get))
22:54	clojurebot	#{2 3}
22:55	hiredman	^- gets inlined by the compiler
22:55	jli	huh, interesting
22:55	hiredman	binding like that also won't work on 1.3
22:55	hiredman	since binding only works on dynamic vars and dynamic vars are not the default anymore
22:56	nkoza	thanks
22:56	jli	hiredman: oh? is (def ...) in user code no longer dynamic?
22:57	nkoza	btw, in 1.2 I can do (set! warning-on-reflection true) but I can't do (def w 3) and a (set! w ..) outside a binding form. How warning-on-reflection is different from w?
22:58	amalloy	the repl establishes a top-level thread-local binding for warn-on-reflection for you
22:59	amalloy	you could (binding [w 10] (set! w 100) (...w is 100 until binding ends...))
22:59	amalloy	but don't do that
23:00	nkoza	amalloy: so doing (set! warning-on-reflection ..) outside the repl (and outside a binding form) will not work ?
23:00	amalloy	it might be clojure.main that establishes it, but i'm pretty sure there are contexts where that won't work, yes
23:02	nkoza	ok, thanks
23:05	nkoza	I read methods implemented inside the defrecord definition are faster than ones implemented with extend, how they differ behind the curtains?
23:18	adam_	hey guys, anyone here using clojure in academia?
23:20	symbole	adam_: Somebody probably is using it. You'd have to be more specific.
23:21	adam_	thanks, i've never used IRC before
23:21	symbole	Welcome!
23:22	adam_	i just wanted to talk about clojure, since everyone I know has no idea what it is
23:23	symbole	You've come to the right place.
23:23	adam_	anyway, i was wondering if anyone knows of any bioinformatics/ computational biology projects that use clojure
23:24	adam_	that is, beyond bioClojure and that type of thing
23:41	devth	i have a `let` clause that defines a few vars for me. i need to use this same let clause in a few spots. how do i extract that into a separate function?
23:41	nkoza	use a macro
23:42	devth	nkoza: ah, right. thanks. first day of clojure :)
23:46	dakrone	adam_: there's a group that started not too long ago working on https://github.com/jayunit100/BioClojure
23:48	adam_	thanks dakrone
23:50	quotemstr	Is there any reason the compiler allows (let [foo 42] (foo)) to compile without a peep?
23:50	jli	it's a dynamic language
23:51	quotemstr	jli: Of course, but it's pretty obvious that that construct will never work.
23:51	quotemstr	Ahwell.
23:51	jli	it's a dynamic language :)
23:52	nkoza	the "sufficient advanced compiler" can detect itthe problem, but that compiler is always a mythical creature :)
23:52	quotemstr	Is there anything like elisp's (format "%S" obj) that'll print out a representation of any kind of object?
23:53	jli	quotemstr: (str whatever-object)
23:54	quotemstr	Awesome! Thanks.
23:54	jli	hm, how do you use clojurebot
23:54	jli	(doc str)
23:54	clojurebot	"([] [x] [x & ys]); With no args, returns the empty string. With one arg x, returns x.toString(). (str nil) returns the empty string. With more than one arg, returns the concatenation of the str values of the args."
23:54	srid	quotemstr: yet another elisper learning clojure?
23:55	symbole	quotemstr: foo can refer to a Var or a function. It's not clear that it shouldn't be allowed.
23:55	quotemstr	srid: And CLer. :-)
23:55	quotemstr	srid: The FORMAT incantation just wasn't coming to mind.
23:55	srid	quotemstr: the "quick ref" at clojuredocs.org is pretty handy
23:56	quotemstr	(~S maybe?)
23:56	srid	if you look at the 'format' docs at clojuredocs.org it links to the java docs with full format spec
23:56	jli	there's also clojure.core/format
23:56	jli	(doc format)
23:56	clojurebot	"([fmt & args]); Formats a string using java.lang.String.format, see java.util.Formatter for format string syntax"
23:57	srid	yes, you need the java docs for format spec, which is linked from the unofficial docs site. that is what i like about it; anybody can edit docs (well, more like adding links and examples)