#clojure – 2009-06-22

2009-06-22

01:10	arohner	danlarkin: ping
02:44	vika23	Is there a function to convert string to numbers in clojure ?
02:45	grrrt	vika23: you could do (Integer. "123")
02:45	grrrt	(java equivalent of new Integer("123") )
02:47	vika23	grrrt: Thanks a lot :)
02:47	hoeck	vika23: or (Integer/valueOf "123")
02:48	hiredman	,(Integer/parseInt "123")
02:48	clojurebot	123
03:08	frodef	how do I write a macro that expands to something like (let [foo bar] ~@body (zot foo)) ? I get "Can't let qualified name foo" error..
03:09	hiredman	yeah
03:09	hiredman	clojure's macro system doesn't like non gensymed names because they make for unhygenic macros
03:09	hiredman	so you need to replace foo with foo#
03:10	hiredman	inside a syntax quote (`) foo# expands into a gensymed symbol
03:10	hiredman	,`foo#
03:10	clojurebot	foo__3466__auto__
03:10	hiredman	,`foo#
03:10	clojurebot	foo__3470__auto__
03:10	frodef	but the same one each time?
03:10	frodef	,`(foo# foo#)
03:10	clojurebot	(foo__3474__auto__ foo__3474__auto__)
03:10	frodef	aparently :)
03:11	hiredman	frodef: in the same syntax quote it will be the same
03:11	frodef	ok, thanks.
03:11	hiredman	`(foo# ~`foo#)
03:11	hiredman	,`(foo# ~`foo#)
03:11	clojurebot	(foo__3479__auto__ foo__3478__auto__)
03:37	grrrt	hm. I'm trying to create a function that generates a string consisting of a character c repeated n times.
03:37	grrrt	I have ,(take 10 (cycle ["-"]))
03:37	grrrt	but I'm not sure how to make a string from that
03:38	hiredman	apply str
03:38	grrrt	ah of course! thanks!
03:38	hiredman	you might use repeat instead of cycle
03:38	hiredman	,(doc repeat)
03:38	clojurebot	"([x] [n x]); Returns a lazy (infinite!, or length n if supplied) sequence of xs."
03:38	grrrt	yes much better
03:39	hiredman	,(take 10 (repeat \c))
03:39	clojurebot	(\c \c \c \c \c \c \c \c \c \c)
03:39	grrrt	I thought cycle was a bit strange in this case. cheers
03:40	grrrt	,(apply str (repeat 10 "-"))
03:40	clojurebot	"----------"
07:18	Lau_of_DK	Is there a demo up somewhere of a small compojure app which uses the new session middle-ware stuff?
07:37	emacsen	Chouser, you around?
07:39	opqdonut	can for iterate over two lists at the same rate?
07:39	opqdonut	like cl loop does
07:40	emacsen	usually if you're iterating you're doing something wrong
07:40	emacsen	(not always but so many times)
07:40	Lau_of_DK	emacsen: by what logic ?
07:40	emacsen	Lau_of_DK, you can usually accomplish the same thing with a filter of one or another sort
07:40	emacsen	operating on a data structure rather than iterating through results
07:41	Lau_of_DK	(filter even? (iterate inc 1)) ? :)
07:41	Lau_of_DK	Sometimes it exactly what you want
07:41	emacsen	and I'm late for work so I'm gonna shower and go
07:41	Lau_of_DK	And it beats recursion
07:41	emacsen	I said usually :)
07:41	Lau_of_DK	looping is not really iterating though, and if we make that distinction I agree, usually when I loop its for some sideeffect :(
07:44	opqdonut	emacsen: iterating? wrong?
07:45	opqdonut	i'd just like to be able to write stuff like (map f data (range 1)) using a for
07:46	opqdonut	err, by (range 1) i really meant (iterate inc 0)
08:04	Lau_of_DK	Couldnt you just use apply ?
08:05	emacsen	Lau_of_DK, that was kinda my point. Oftentimes people want to use iterate but they could easily use a different style, as you said, he could probably use apply
08:05	emacsen	hey pjb3
08:06	pjb3	emacsen: hey
08:06	Lau_of_DK	emacs, I kinda got your point, eventually :)
08:06	emacsen	So, since Chouser isn't here, anyone familiar with the Java "exec", as used in the shell-out contrib?
08:06	emacsen	I just want to pass the program some arguments, and that causes it to fail, eg "find /home/foo"
08:06	emacsen	it looks for a program named "find /home/foo"
08:07	Lau_of_DK	emacsen, check out Gitdoc on Github, its not updated, but I use that functionality
08:07	emacsen	Gitdoc?
08:07	Lau_of_DK	http://github.com/Lau-of-DK/gitdoc/tree/master
08:08	emacsen	heh, love the last commit "removed shell-out" :)
08:08	Lau_of_DK	hehe :)
08:09	Lau_of_DK	it should be in engine.clj
08:09	emacsen	which file.. thank you :)
08:10	emacsen	the Runtime/getRunTime part with your exec?
08:10	Lau_of_DK	http://github.com/Lau-of-DK/gitdoc/blob/26b219792b14c3535850047d3e2c2c7072e56855/src/dk/bestinclass/gitdoc/engine.clj#L137
08:10	Lau_of_DK	Yea, thats what youre looking for I hope
08:11	emacsen	possibly. I'm so java ignorant I have to look up each of those :)
08:11	Lau_of_DK	I dont use a buffer at all though, like I said its outdated, but you'll get the picture, compare that to shell_out and you can make the perfect func
08:11	Lau_of_DK	I gotta jet, l8r
08:11	emacsen	okay thanks
08:15	frodef	is sort and sort-by a stable sort?
08:15	maacl	Newbie question: Why does the following blow the heap: (map (fn [s](apply str s)) (selections (map char (range 97 123)) 4))
08:18	maacl	selections is the selections function from clojure.contrib.combinatorics btw
08:24	Chouser	maacl: works fine here.
08:25	Chouser	It's going to print a lot if you run it at the repl, but wrapping either first or last around it works fine.
08:27	maacl	Chouser I run out of Java heap space if I run the whole thing ie java.lang.OutOfMemoryError: Java heap space
08:32	maacl	Chouser: Also if I try to do a "last"
08:32	Chouser	I don't think there's anything inherently wrong with your expression. It produces 456976 strings which isn't nothing.
08:33	jao	hi. sorry if this a FAQ, but what's the way of writing bindings to a C library in clojure? (asked by someone who knows very little java)
08:33	Chouser	but with 'last' or 'first' it should be throwing them away as fast as they're created.
08:33	Chouser	jao: If you're not overly concerned with speed, I'd recomment JNA: http://github.com/Chouser/clojure-jna
08:34	jao	Chouser: aha, thanks! and if i were concerned? ;)
08:34	Chouser	jao: otherwise you'll have to use JNI, the Java Native Interface.
08:34	maacl	Chouser: I thought so, but "last" just hangs and just running it runs out of heap space
08:34	eevar2	jao: http://java.sun.com/docs/books/jni/
08:35	jao	Chouser, eevar2: i see, thanks again
08:36	Chouser	maacl: very odd. works fine here. What versions of Java and Clojure are you using?
08:36	eevar2	jao: if you're concenred with speed, you're probably better off finding a Java library which does what you want, tho
08:36	maacl	Chouser: java 1.6.0_13
08:38	maacl	Chouser: clojure 1.1 alpha
08:39	maacl	Chouser: oh, "last" actually completes - just took 4-5 mins
08:41	Chouser	maacl: 3 seconds here, on the same jvm and recent clojure
08:43	maacl	Chouser: I will update clojure and try again
08:43	maacl	Chouser: The CPU runs beserk, and no extra memory is used
08:44	Chouser	that sounds right. perhaps that's just how long it takes to compute everything you're asking for on that CPU?
08:46	maacl	Chouser: A Athlon 64 3400+? now brand new, but still?
08:46	Chouser	hmph. that's probably faster than what I'm using. weird.
08:48	rhickey	what's the code?
08:48	maacl	rhickey: (map (fn [s](apply str s)) (selections (map char (range 97 123)) 4))
08:49	rhickey	selections?
08:50	Chouser	(use '[clojure.contrib.combinatorics :only [selections]])
08:50	maacl	rhickey: from clojure.contrib.combinatorics
08:50	durka42	(doc selections)
08:50	clojurebot	"clojure.contrib.combinatorics/selections;[[items n]]; All the ways of taking n (possibly the same) elements from the sequence of items"
08:51	rhickey	maacl: how much memory are you giving the JVM?
08:52	maacl	rhickey: I haven't set any options? should I ?
08:53	maacl	rhickey Chouser: Just tried on my MacBook too - same thing
08:54	Chouser	maacl: are you loading anything else first? using an IDE?
08:54	rhickey	maacl: usually, yes, the default heap is puny use: -Xmx512m where 512 is however many mbs you want to give it
08:54	Chouser	huh. I never set a heap option.
08:55	rhickey	didn't contrib's build used to have a nice message when trying to compile saying it wasn't really without a path to clojure.jar?
08:55	Chouser	yeah
08:55	maacl	rhickey Chouser: I user emacs/slime
08:55	achim	i can reproduce with SLIME, but not in the terminal,with otherwise identical (= default) settings
08:55	Chouser	oooh, we have a culprit
08:55	rhickey	what happened to it?
08:56	maacl	Chouser: sounds like it
08:56	clojurebot	Who??
08:57	Chouser	rhickey: with the latest contrib, I get a WARNING if I don't suppot -Dclojure.jar=... on the ant command-line
08:58	rhickey	.9 secs on my machine
08:59	maacl	rhickey: from slime?
08:59	rhickey	(calling last on that map return)
09:03	rhickey	my bad, old contrib
09:06	maacl	rhickey: did you get .9 from slime?
09:07	maacl	ah
09:08	achim	i'm getting a strage exception when trying to build clojure & contrib using ant ... has anybody seen something like this before?
09:09	lisppaste8	achim pasted "exception when building via ant" at http://paste.lisp.org/display/82282
09:09	Chouser	achim: yeah
09:10	Chouser	achim: http://www.assembla.com/spaces/clojure/tickets/124
09:10	Chouser	compiling with Java 5, I assume?
09:13	achim	Chouser: don't think so, unless ant overrides the system default. java -version is "1.6.0_13"
09:14	rhickey	when tests burn in broken behavior:
09:14	rhickey	[java] FAIL in (test-range) (sequences.clj:840)
09:14	rhickey	[java] expected: (= (range 2.5) (quote (0 1)))
09:14	rhickey	[java] actual: (not (= (0 1 2) (0 1)))
09:14	rhickey	[java]
09:14	rhickey	[java] FAIL in (test-range) (sequences.clj:840)
09:14	rhickey	[java] expected: (= (range 7/3) (quote (0 1)))
09:14	rhickey	[java] actual: (not (= (0 1 2) (0 1)))
09:14	clojurebot	☕
09:14	Chouser	oh, I guess Steve reported Java 6 failing on Leopard as well.
09:15	maacl	Chouser: confirm I got it to work from the REPL. Who should I report the error to?
09:16	Chouser	I guess that agent shutdown patch should be backed out. It was only meant to solve an annoyance -- current behavior sure seems more annoying for the poeple it affects.
09:16	Chouser	maacl: for a slime bug? I don't really know, sorry.
09:17	maacl	Chouser: ok, also hard to know if it is a slime or swank-clojure bug really
09:19	achim	Chouser: ah, thanks for the pointer!
09:42	frodef	what does this mean? java.lang.NoClassDefFoundError: clojure/lang/IteratorSeq
09:42	frodef	Do I need to import some iterator-seq library?
09:46	frodef	It seems to happen when I try to access an ArrayList I get from java.
09:47	frodef	,(seq (new java.util.ArrayList))
09:47	clojurebot	nil
09:47	frodef	I get that error..?
09:57	Chousuke	frodef: classpath problems probably :P
09:58	frodef	yes, I had messed up my jars, it seems. fixed it.
09:58	frodef	thanks.
10:11	achim	re: http://www.assembla.com/spaces/clojure/tickets/124 - if i have ant fork the JVM for compilation, it seems to work fine
10:13	achim	granting a modifyThead permission as outlined here doesn't seem to work:http://ant.apache.org/manual/CoreTypes/permissions.html - all other permissions seem to get revoked when doing that
10:13	achim	does anybody have a deeper understanding of the ant/java permissions scheme?
10:13	Chouser	achim: thanks a lot for looking at that. I spent 2 minutes googling and gave up.
10:29	Chouser	achim: you could attach a patch to that ticket
10:29	achim	Chouser: seems to work for java 1.5/osx, 1.6/osx and 1.6/ubuntu - i'll see if i get git to make me a patch
10:30	achim	it's a patch to a patch - how to go about this? should my patch include the other change? is there a way to do this and preserve authorship info?
10:30	Chouser	achim: there are instructions at http://clojure.org/patches
10:31	Chouser	since the other patch is already committed, I think you should go ahead and patch again master
10:32	achim	Chouser: ok
10:56	dhaza	how does clojurebot prevent people from evaling evil things?
10:57	stuartsierra	,(eval '(System/exit 0))
10:57	clojurebot	DENIED
10:57	Chouser	dhaza: a combination of a java sandbox and special form blacklisting
10:57	Chouser	that was the blacklist
10:58	Chouser	,(System/exit 0)
10:58	clojurebot	java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
10:58	Chouser	there's the sandbox
10:58	Jonathan-Smith	(eval '(+ 2 3))
10:59	Jonathan-Smith	,(eval '(+ 2 3))
10:59	clojurebot	DENIED
11:00	Jonathan-Smith	eval is denied
11:00	Chouser	indee
11:00	Chouser	indeed
11:00	achim	clojure-contrib has the same compilation issue. is it okay to file contrib tickets?
11:03	Chouser	achim: I think so, but I guess file it in the contrib project.
11:07	danlarkin	arohner: sorry we keep missing eachother. Short answer (if you haven't found it already) is that keys in json objects must be strings
11:08	achim	Chouser: of course. i wasn't sure because of missing GC tickets
11:08	Chouser	achim: oh, I see. yeah, go ahead.
11:09	Chouser	I'm not sure if anyone's going to bother bringing over all the closed tickets or not.
11:10	arohner	danlarkin: and that's a restriction imposed by JSON?
11:11	Chousuke	Chouser: We did that with Clojure, but I suppose it's not really needed.
11:11	Chouser	Chousuke: yes, and I'm sure it's appreciated. Clojure's history is a bit more critical than contrib's, I think.
11:11	Chouser	And contrib's tickets may be brought over yet.
11:12	danlarkin	arohner: correct, to be valid json the keys must be strings. Of course, nothing stopping you from producing invalid json, but yeah that's why clojure-json prints them as strings
11:12	Chouser	But having the closed tickets a bit out of order hardly seems critical.
11:12	Chousuke	yeah.
11:13	arohner	danlarkin: is that json different from a map literal in a javascript call?
11:14	arohner	or do the JS libraries violate the spec?
11:14	danlarkin	arohner: an object literal in javascript has non-string keys
11:14	arohner	sigh. ok. I thought they were the same thing
11:15	Chouser	danlarkin: really?
11:15	danlarkin	Chouser: yep :-/ it's dumb
11:15	Chouser	what kind of object literal?
11:15	dhaza	many json libraries dont implement json correctly
11:15	dhaza	which is funny, because it has one of the sparsest syntax i've seen
11:15	danlarkin	Chouser: {foo:1, bar:2}
11:16	dhaza	and the pretty graphs on json.org make it even easier
11:16	Chouser	({foo:1, bar:2})["foo"] returns 1 for me in firefox
11:16	dhaza	Chouser, keep in mind that many implementations will try to accept malformed json if it can
11:17	Chousuke	Chouser: I think JS will allow you to access attributes using strings.
11:17	Chousuke	it's quite dynamic :P
11:17	danlarkin	Chouser: oh.. yes... attribute access uses strings, defining the literal object, though, uses non-strings
11:17	arohner	danlarkin: thanks for your help
11:18	dhaza	Chousuke, yes - obj["foo"] <=> obj.foo
11:18	Chouser	but if I can get and set object literals using string keys, what's the difference?
11:18	dhaza	in js
11:18	dhaza	http://stackoverflow.com/questions/61088/hidden-features-of-javascript
11:19	danlarkin	Chouser: just that when you're defining the object literal in JS, you can't use string keys, you have to use symbols... {foo:1} instead of {"foo":1} like most languages
11:20	Chouser	oh, as in {"foo":1} is legal json but not legal js?
11:21	danlarkin	Chouser: correct... and the opposite is also true: {foo:1} is legal js but not json
11:22	Chouser	beautiful.
11:23	Chouser	so all this time I thought I was using json so I could eval in the brower, I was only doing json-ish.
11:24	Chousuke	hm
11:24	danlarkin	eval() is a really bad javascript json parser, which is ironic of course... most javascript libraries like jquery et al. package their own json parser
11:25	Chousuke	firefox doesn't complain about {"foo":1}.foo
11:25	Chousuke	it gives 1
11:26	Chousuke	but I thought the whole point of json is that it's valid javascript.
11:26	Chouser	danlarkin: in what way is it bad? I mean, I wouldn't eval js from untrusted sources, but other than that it runs very fast and has worked fine for me.
11:26	danlarkin	Chousuke: yeah it's just trying to do the right thing IMO, other engines are less forgiving
11:27	dhaza	Chousuke, it would be nice, but it would uglify things
11:27	dhaza	for example
11:27	dhaza	is {false:true} a bool or a string key?
11:27	dhaza	well, i guess you cant have bool keys
11:27	dhaza	:(
11:28	dhaza	i meant a bool or string value
11:28	danlarkin	Chouser: yeah, eval just has security implications... it's true that it's very fast
11:28	dhaza	danlarkin, i don't think that should be a concern with modern javascript engines coming to the forefront
11:28	dhaza	v8/squirrelfish/etc
11:29	dhaza	they compile js down to native code
11:30	dhaza	ps: why are we talking about json?
11:32	Chouser	string keys appear to be allowed for object initializers, according to the ecmascript spec
11:32	Chouser	http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf page 41 and 42
11:33	Chouser	propertyname can be an Identifier, StringLiteral, or NumericLiteral
11:33	Chouser	identifiers and numbers are converted to strings for use as the property name
11:35	danlarkin	Hmmmmm
11:42	danlarkin	Chouser: welp, looks like you're right!
11:42	Chouser	danlarkin: don't worry, I won't let it go to my head
13:24	tsdh	Hi. Are hyphens in namespaces somehow forbidden? I have de.tsdh.utils.tgraph-inspector but the ant job fails because it cannot find de/tsdh/utils/tgraph_inspector__init.class or de/tsdh/utils/tgraph_inspector.clj.
13:25	kotarak	tsdh: - translates to _ in the filename
13:25	Chouser	(and the class name)
13:25	tsdh	So the file should be tgraph_inspector.clj, right?
13:25	kotarak	yup
13:26	tsdh	kotarak: Works! Thanks a lot.
13:26	kotarak	np
13:56	kotarak	Offtopic, but.. : why do I get different git checksums for commits I pulled via githubs ForkQueue?
13:57	dysinger	ask on #github or #git ?
13:58	kotarak	k, just thought, there might be a simple answer one of the git fans could give.
14:04	dysinger	kotarak I only notice different checksums when I cherry pick
14:05	dysinger	I haven't used github fork queue but about 3 times so not sure what's going on there - it should be just a merge
14:07	danlarkin	github's fork queue does a cherry pick
14:07	dysinger	there you go
14:07	kotarak	-.- That means, I get double commits, when I pull now from the master repo?
14:17	dysinger	Even if you get double commits the second commit will not add anything strange
14:20	danlarkin	right, they are idempotent!
14:20	danlarkin	right? I think
14:24	kotarak	I'll try and see what happens...
14:33	dhaza	the diff should fail
14:33	dhaza	you can just ignore it
15:06	eliantor	hi
15:07	dhaza	howdy
15:08	eliantor	how can i change a global variable defined in another namespace?
15:08	eliantor	for example print-pretty or load-tests from clojure contrib?
15:09	technomancy	~binding
15:09	clojurebot	No entiendo
15:09	technomancy	eliantor: use binding
15:09	kotarak	(doc binding)
15:09	clojurebot	"([bindings & body]); binding => var-symbol init-expr Creates new bindings for the (already-existing) vars, with the supplied initial values, executes the exprs in an implicit do, then re-establishes the bindings that existed before."
15:09	eliantor	so i've to wrap everithing in the binding form?
15:10	kotarak	yes
15:10	eliantor	ok thanks
15:10	kotarak	beware of thread boundaries
15:10	kotarak	and lazy seqs (read map and friends)
15:11	eliantor	i knew of binding but i thought there was another way
15:11	technomancy	you can use set! and with-ns, but that's shaky
15:12	ataggart	if you def a function from inside a binding, will invokgin that function from outside the binding use the original value or the bound value?
15:12	ataggart	I guess I should just try it
15:12	kotarak	ataggart: I think, the value in effect during the call.
15:13	ataggart	bindings being threadlocal, that would be my assumption as well
15:13	weissj	sorry this has probably been asked a million times, but i have searched and can't find anything: where is the equivalent of caar or cddr in clojure? there's no ffirst or rrest.
15:14	kotarak	(doc nnext)
15:14	clojurebot	"([x]); Same as (next (next x))"
15:14	Chousuke	weissj: ffirst is there :/
15:15	ataggart	so is fnext
15:15	kotarak	(doc ffirst)
15:15	clojurebot	"([x]); Same as (first (first x))"
15:15	Hun	somehow i like c[ad]{1,5}r better...
15:15	weissj	ok, sorry i was looking for rrest - so, next and rest are the same?
15:15	Chousuke	not quite.
15:16	weissj	Hun: me too. car and cdr are meaningless but you can make better complex forms out of them :)
15:16	ataggart	also, it's not arbitrary like c[a\|d]r
15:16	ataggart	in terms of how deep you go
15:16	Chousuke	next is equivalent to (seq (rest ..))
15:17	Chousuke	so it returns nil if rest returns an empty seq
15:17	Hun	weissj: and they're faster than first and rest. you know, they are hardware ;)
15:18	weissj	so, nnext is not the same as rrest. there is no rrest. so it's just missing then?
15:18	Chousuke	I'm not much of a fan of combining car and cdr though.
15:18	Chousuke	I find them difficult to read :/
15:18	ataggart	Hun: when does one typically use the deep c[ad]r stuff?
15:18	weissj	Hun: the hardware is so old I'm not so sure :)
15:19	Chousuke	if you're nesting a lot then you should have a more meaningful function to extract the parts you want. even if it's just an alias for caddr or something :P
15:20	Chouser	weissj: right, rest is used when you're explicitly avoiding realizing the next step of the seq. Thus rrest would almost never be used.
15:20	Hun	ataggart: i haven't used anything deeper than 3 - in this case it was an optimization for a tree i knew to be at max 3 levels deep
15:21	weissj	Chouser: i have a data type that is a name, desc, and then a seq of nested data. isn't rrest exactly what i want to get the list of nested data?
15:22	Chouser	nnext
15:22	vika23	I am trying java-gnome with clojure . There is a Window class and it has a nested interface DeleteEvent , i want to implement it. How do i use with proxy, (proxy [???] ...).
15:22	duncanm	vika23: did you check out the API docs online?
15:22	Chousuke	Window$DeleteEvent
15:22	kotarak	weissj: {:name .. :desc ... :data seq-here} is probably what you want instead of nnext...
15:23	ataggart	then (:data mymap)
15:24	vika23	Chousuke: thanks
15:25	eliantor	i'm following the example of using binding on clojure.org, but it doesn't work
15:25	eliantor	it always use the bindings estabilished by def
15:26	hiredman	eliantor: pastebin
15:26	eliantor	http://clojure.org/vars what's wrong?
15:26	hiredman	lisppaste8: url?
15:26	lisppaste8	To use the lisppaste bot, visit http://paste.lisp.org/new/clojure and enter your paste.
15:28	hiredman	eliantor: are you doing exactly what it shows there?
15:29	lisppaste8	eliantor pasted "untitled" at http://paste.lisp.org/display/82294
15:30	eliantor	hiredman: yes
15:30	hiredman	eliantor: are you using clojure 1.0?
15:30	eliantor	hiredman: 1.1, is there a bug?
15:31	hiredman	eliantor: nope
15:32	hiredman	dunno what to tell you, works perfectly with my pre-1.0 clojure and my 1.1-alpha clojure
15:32	eliantor	...
15:32	hiredman	eliantor: restart your repl and try again
15:34	eliantor	hiredman: always the same behaviour, i'll try to update and recompile
15:36	ataggart	eliantor: are you using the 1.0.0 jar?
15:37	weissj	what's the equivalent in clojure to '#
15:37	weissj	to pass a function by name without evaluating it
15:38	kotarak	?? You mean the Var?
15:38	kotarak	#'foo
15:38	eliantor	i've updated clojure and the problem is solved, thanks
15:38	Chouser	weissj: you can just refer to a function by name
15:39	Chouser	,map
15:39	clojurebot	#<core$map__4435 clojure.core$map__4435@6f2a75>
15:39	hoeck	weissj: clojure is a lisp-1, so vars have no function and value slots
15:42	weissj	in the REPL, if my code throws an exception how can i tell where the exception was thrown from? the error message just has (repl-1:110) as the line number
15:43	weissj	the error is definitely NOT on that line: (all-subtasks-complete? x)
15:43	Chouser	(.printStackTrace *e)
15:49	weissj	Chouser: perfect thanks
15:50	weissj	ok, and if i want the exception that i throw to have a message and concat the string representation of a list, how to convert?
15:51	weissj	i want the string that print prints, but print doesn't return this string
15:51	stuartsierra	pr-str
15:52	Chouser	,(throw (Exception. (str "This is a bad list: " (pr-str '(bad wrong icky nasty)))))
15:52	clojurebot	java.lang.Exception: This is a bad list: (bad wrong icky nasty)
15:53	Chousuke	hmm
15:53	Chousuke	,(str '(foo bar))
15:53	clojurebot	"(foo bar)"
15:54	emacsen	Chouser, you still here?
15:54	Chouser	emacsen: yes
15:55	kotarak	,(str '("foo" "bar"))
15:55	Chouser	,(str '(foo "foo" :foo))
15:55	clojurebot	"(\"foo\" \"bar\")"
15:55	clojurebot	"(foo \"foo\" :foo)"
15:55	Chouser	hmm.
15:55	emacsen	Chouser, in your shell-out "sh" function, how do you pass the command arguments?
15:56	Chouser	emacsen: there are examples at the end of the file
15:56	emacsen	oh, okay, I'm just an idiot :)
15:56	Chouser	(sh "ls" "-l")
15:56	emacsen	I coulda sworn I tried that but apparently not :)
15:57	Chouser	emacsen: not at all! someday all the documentation will be full of examples, easily searchable, and cross-linked.
15:57	Chouser	for now, asking here is fine. :-)
15:57	emacsen	ah. I see. I tried passing it a list
15:57	emacsen	I did (sh '("ls" "-l"))
15:57	emacsen	your way is better :)
15:58	Chousuke	Chouser: You dream big.
15:58	Chouser	well, maybe. if you're constructing a list of args and also want to use keyword args, you have to do something like (apply sh :out :bytes "ls" args-list) ...not sure that's ideal
15:58	bpattison	Chouser what namespace is printStackTrace in?
15:59	Chouser	Chousuke: heh. :-)
15:59	kotarak	bpattison: it's a method of the exception. (.printStackTrace *e) (note the leading dot)
15:59	Chouser	bpattison: it's not! It's a method of the Java Excpetion class.
16:00	kotarak	Is there now a Core team?
16:00	Chouser	kotarak: I don't think so.
16:01	kotarak	Chouser: I saw some committers besides Rich, no?
16:01	Chouser	the git commits give primary credit to the original patch author, so it looks like there are lots of committers now.
16:01	kotarak	Oh.
16:01	Chouser	but anyone who's signed a CA can get a patch in.
16:02	Chouser	instructions here: http://clojure.org/patches
16:06	Chouser	I'm not sure I said that quite right. rhickey has always taken patches from contributors, but he manually gave credit in the commit message, so his name was still the most prominent.
16:06	Chouser	so other than some process techincallities the only real change is that git automatically gives primary credit to the original patch author.
16:07	vika23	how old is clojure ?
16:08	ataggart	just a couple of years
16:08	kotarak	3.5 years, 1.5 years in the public
16:08	hiredman	~git e54a1ff1ac0d02560e80aad460e77ac353efad49
16:08	clojurebot	created IDEA project
16:08	hiredman	bah
16:09	hiredman	clojurebot: why don't you show the date?
16:09	clojurebot	why not?
16:09	kotarak	Chouser: I just thought, that there is now a team, because there are some signed-off-by things, if I saw this correctly. So I thought there is now a team of Leutnants doing some filtering for rhickey.
16:11	Chouser	kotarak: I'm doing some of the grunt work pushing patches in for him, but no patch gets in without rhickey's explicit approval.
16:11	kotarak	Yes. I wouldn't expect that there is some change w/o rhickey's approval.
16:12	ataggart	is it possible to do a no-arg defmethod ?
16:12	Chouser	ataggart: what would it dispatch on?
16:13	ataggart	well, it wouldnt need to
16:13	ataggart	ince there could only be one
16:13	Chouser	ataggart: why make it a defmethod instead of just a defn?
16:13	ataggart	heh
16:14	ataggart	I was thinking of a no-arg that called an arg'd method using a default value
16:14	Chouser	oh, I see.
16:14	Chousuke	you could use rest args for the dispatch?
16:15	ataggart	then I'd need a more funky dispatch function
16:15	ataggart	right?
16:15	kotarak	One could use (fn [& args] (if (> 0 (count args)) (dispatch-somehow) :default)) as dispatch function, no? and (defmethod bla :default ([] (bla :xxx)) ...))
16:15	ataggart	somehow (my-fn) needss to get routed to the right method
16:16	ataggart	ahh I see
16:16	ataggart	didn't realize you could return :default from the dispatch function
16:16	ataggart	though it makes perfect sense that it should work
16:17	kotarak	Haven't tried, though.
16:28	ataggart	what's the most straightforward way to dispatch on the types of more than one arg?
16:29	kotarak	ataggart: a vector (fn [&args] (vec (map type args))) (defmethod bla [Integer String] ...)
16:29	ataggart	ah excellent thx
16:31	kotarak	ataggart: note that there is no [Integer :default]. For that one needs a ::Bottom type, which one derives everything from.... (derive Object ::Bottom) (defmethod bla [Object ::Bottom] ...)
16:31	ataggart	what's the double-colon notation mean?
16:31	kotarak	namespace-qualified keyword
16:31	ataggart	ah k
16:31	kotarak	,::foo
16:31	clojurebot	:sandbox/foo
16:32	kotarak	Keywords need to be qualified to be allowed in a derive.
16:35	stuartsierra	Things you never knew about Java: http://stackoverflow.com/questions/15496
16:43	Chouser	that's a great thread
16:47	bpattison	is there a string construct in clojure similar to python's triple quote where line break don't need to be escaped?
16:48	Chouser	line breaks in regular double-quotes don't need to be escaped.
16:48	bpattison	so I don't need "\n\n" ?
16:48	Chouser	right, you can just continue on the next line.
16:48	bpattison	ah -- okay -- great
16:49	bpattison	ah. sweet
16:51	Chouser	of course python's triple-quote allows unescaped double quotes as well -- there's no way to do that in Clojure code currently.
16:52	bpattison	line-breaks is a big plus -- especially with test data
16:56	dhaza	reader macros ftw
17:00	Drakeson	is there anyone using mac? git clone git://github.com/richhickey/clojure.git and then cd clojure, and run ant. it fails.
17:01	Chouser	Drakeson: hang on a sec.
17:01	Drakeson	master~2 does not fail. apparently the commit before last is at fault.
17:01	Chouser	yes
17:03	ataggart	is there a more sensible way to do default values than: (let arg (if arg arg default-value) ...) ?
17:03	Chouser	Drakeson: http://www.assembla.com/spaces/clojure/tickets/124
17:09	Drakeson	There is a patch that allegedly resolves it. Is it a workaround until a real fixed is developed?
17:09	Chouser	Drakeson: I don't know. try a fresh pull now.
17:09	Drakeson	s/allegedly// (I tried and it works)
17:10	Chouser	I don't know enough about the issue to know if the ant fork solution is a good permanent solution or not.
17:10	Drakeson	thanks.
17:11	Chouser	For now the change that broke Compile is removed until the right way forward is decided.
17:28	lazy1	..
17:28	Jetien	hi kotarak! sorry to bother you but i'm having problems with vimclojure again. I try to run this example http://java.ociweb.com/mark/clojure/article.html#DesktopApps and again no side-effects (no windows open, etc.) occur when this is evaluated from within vimclojure. same problem as the snake example from yesterday. do you have any hints?
17:33	kotarak	Jetien: I'm not sure, I understand, what's going on.
17:33	kotarak	(doto (JFrame.) (.setVisible true)) opens a new window.
17:35	Jetien	yep, i can confirm that
17:36	Jetien	i was afraid that wasn't going to work at all
17:37	kotarak	I don't know, why it sometimes doesn't work. I'm not really a Java guy...
17:38	Jetien	is there a way to debug?
17:38	kotarak	The Repl does nothing return, right? Not even nil or something.
17:40	Jetien	correct
17:40	Jetien	but it should at least return something, right?
17:40	kotarak	Yeah.
17:42	kotarak	Something cheesy is going here...
17:42	Jetien	is there a way to circumvent the nailgun server and use clojure directly?
17:42	kotarak	you can start a normal repl and the nailgun server from there.
17:42	kotarak	So you can work directly in the clojure.main repl, but still can send forms from inside vim.
17:43	Jetien	i wonder if this solves the problem
17:44	kotarak	if so, it's a VC problem, otherwise it's maybe a deeper thing in Clojure itself.
17:45	Jetien	how do you start the ng server? (ng ?)
17:47	kotarak	com.martiansoftware.nailgun.NGServer/main
17:47	Jetien	thanks
17:47	kotarak	You probably want to do this in a separate thread. Haven't tried that manually actually.
17:48	kotarak	But it should work... in theory... ;)
18:27	hircus	anyone here using Netbeans?
18:28	ataggart	I tried. Gave up.
18:28	hircus	my problem is not really with Netbeans+Enclojure, but with trying to use the generated classes from a Java project
18:29	hircus	I use Enclojure to generate a class (:gen-class) that implements an interface, yet the Java project that uses it claims that that class does not exist
18:29	hircus	(building using Ant works, though, so obviously the class does exist)
18:30	ataggart	is the dir where the classes are dumped to in the classpath for netbeans?
18:30	ataggart	for the project, I mean
18:31	hircus	Enclojure creates a JAR, and the other project referenced that JAR, so yes
18:31	hircus	(Netbeans can actually build the project just fine, since that just triggers an Ant task -- but when editing the code, the part that imported the clojure class is always marked as an error
18:31	hircus	i.e. the "import com.example.myclojureclass" part
18:32	ataggart	k, my knowledge has been exhausted. sry
18:32	hircus	no prob. it's really rather bizarre
19:37	dreish	chunked branch slows down (reduce + (range 1000000)) by roughly a factor of 10.
19:46	hiredman	dreish: what about apply?
19:46	dreish	I think that was worse.
21:11	Jonathan-Smith	are there any good articles on getting data out of xml/parsed stuff using clojure?
21:12	combasa	it seems that sometimes Slime gets disconnected from the current frame with my clojure file, how can stop slime and then restart from that frame?
21:12	combasa	hmm thats probably more of an emacs question I guess
21:12	hiredman	Jonathan-Smith: you've seen clojure.xml/parse ?
21:13	hiredman	oh
21:13	hiredman	xml/parsed is the past tense of clojure.xml/parse then?
21:13	Jonathan-Smith	yes i've got it turned into a structure of what looks like vectors and maps
21:14	Jonathan-Smith	just wondering if there is a simple rule for how to traverse it
21:15	hiredman	there is xml-zip
21:15	hiredman	clojure.zip/xml-zip
21:15	Jonathan-Smith	oh really?
21:15	hiredman	yeah
21:15	Jonathan-Smith	does that let you treat it like a tree or something?
21:16	hiredman	yeah
21:16	hiredman	a zipper
21:16	hiredman	there is also some stuff in contrib, and enlive
21:16	hiredman	(doc xml1->)
21:16	clojurebot	"clojure.contrib.zip-filter.xml/xml1->;[[loc & preds]]; Returns the first item from loc based on the query predicates given. See xml->"
21:17	Chouser	dreish: Intersting -- I'm seeing more like x7 slowdown, but chunked is definitely slower than master for that expression.
21:17	hiredman	~def xml1->
21:18	dreish	I'd believe x7. I didn't do a very careful analysis.
21:18	Jonathan-Smith	i think this filter is what i want as i want to extract a set of nodes from the xml
21:22	Chouser	I really really need to try enlive so that I can authoritatively direct people away from zip-filter.
21:42	Jonathan-Smith	i get this error:
21:42	Jonathan-Smith	java.lang.ClassNotFoundException: clojure.contrib.zip-filter.xml (repl-1:8)
21:42	Jonathan-Smith	when trying to use clojure.contrib.zip-filter.xml
21:43	Jonathan-Smith	i'm using clojure-dev and have looked in my sources and it is there
21:45	holmak__	You are using Eclipse?
21:46	Jonathan-Smith	yes
21:46	Jonathan-Smith	should i build a new clojure-contrib?
21:46	holmak__	Hm. You have to make sure clojure-contrib.jar is on the classpath, but I'm not familiar with Eclipse.
21:47	holmak__	I thought clojure-dev provided clojure.jar and clojure-contrib.jar for you prebuilt, but I may be wrong.
21:48	Jonathan-Smith	it does, i can see them in the refrenced libraries section
21:50	holmak__	I can type "(use 'clojure.contrib.zip-filter.xml)" fine at the REPL on the command line, so it's definitely a legitimate library. I don't know what's going wrong in Eclipse.
21:51	Jonathan-Smith	hmm
21:51	Jonathan-Smith	i can do that too
21:52	Jonathan-Smith	hmm
21:53	Jonathan-Smith	it seems that if i 'use' it it works but if I 'require' it it does not work
21:53	Jonathan-Smith	note to self...
21:54	holmak__	require behaves strangely, I always had weird problems with it
21:54	holmak__	I think the general recommendation is to stick to :use and :import, or so I've read.
21:55	grrrt	hm I tend to use require so I don't pollute my namespaces
21:55	Chouser	I've never had an issue with 'require'
21:56	Chouser	I very much dislike naked use -- it makes it harder to read code because you can see names being used and not know where they're coming from.
21:56	Jonathan-Smith	is interesting because :require has been working fine with all of the Java libraries i've been been calling
21:57	holmak__	I just always have awful luck getting Java namespace stuff to work right.
21:57	Chouser	but (use '[clojure.contrib.zip-filter.xml :only [xml1->]]) or something is fine.
21:57	Chouser	Jonathan-Smith: :require does do Java libraries -- it's only for Clojure namespaces.
21:57	Chouser	:import is for Java classes.
21:57	Jonathan-Smith	ooh
21:58	Jonathan-Smith	i was trying to import clojure.contrib
22:00	Chouser	gah. :require does NOT do Java libraries. sheesh.
22:00	Chouser	I only forget the word "NOT" when it's really critical
22:19	jwinter_	Does this logo look familiar to anyone else? http://en.wikipedia.org/wiki/Super_Fresh
22:20	MononcQc	jwinter, how about http://blog.plover.com/prog/haskell/logo.html
22:21	jwinter_	heh
22:25	emacsen	Chouser: any idea why w/ sh "find" seems to fail miserably?
22:26	Chouser	(sh "find" "/tmp") worked fine for me just now.
22:26	clojurebot	for is a loop...in Java
22:27	grrrt	,(doc sh)
22:27	clojurebot	"clojure.contrib.shell-out/sh;[[& args]]; Passes the given strings to Runtime.exec() to launch a sub-process. Options are :in may be given followed by a String specifying text to be fed to the sub-process's stdin. :out option may be given followed by :bytes or a String. If a String is given, it will be used as a character encoding name (for example \"UTF-8\" or \"ISO-8859-1\") to convert the sub-process's stdout to a Stri
22:27	Chouser	clojurebot! What's a "Stri"!?
22:28	emacsen	lol... it just started working... I swear I just used the up arrow in my buffer and now it works
22:29	Chouser	hm. lovely.
22:29	emacsen	and now it fails again... maybe it's my inferior lisp
22:32	emacsen	ah... the problem is my side... stupid symlinks... nevermind :)
22:36	Chouser	whew