#clojure – 2009-04-13

2009-04-13

00:27	joha1	no updates of ClojureCLR in clojure-contrib since late February. Is the project dead, resting, or pining for the fjords? (or perhaps hosted somewhere else?)
00:36	kadaver	figured a really dead simple way to compile haskell to java (each function into a class) but it's basically interpretation.. not sure how to do better
00:37	kadaver	does clojrue do that?
00:41	durka42	do which?
00:41	durka42	clojure source is compiled to bytecode
02:17	kadaver	durka42: ok but is there an intermediate step which turn clojrue code into java classes?
02:19	durka42	well, the bytecode encodes java classes
02:19	durka42	there is no intermediate step with java source code, if that's what you mean
02:20	kadaver	i dont mean .class files, i mean class FunctionFoo {...}
02:21	kadaver	but ok
02:21	kadaver	so any info on how? a namespace is what really, a static class with functions as methods?
02:22	Raynes	kadaver: You've earned first prize for most misspellings of 'Clojure'.
02:23	hiredman	kadaver: no
02:24	hiredman	~def c.l.Compiler
02:24	hiredman	functions are themselves objects
02:24	hiredman	,(class (fn [] ))
02:24	clojurebot	sandbox$eval__2839$fn__2841
02:31	DTrejo	Hey guys, I come from an eclipse and java background; what do you suggest I start learning clojure on? (what ide/setup?)
02:32	hiredman	whatever you are most comfortable with, that being said, there is a large emacs following
02:32	hiredman	I personally use vim
02:32	durka42	does clojure-dev work?
02:32	hiredman	no idea
02:32	durka42	the eclipse plugin
02:32	durka42	http://code.google.com/p/clojure-dev/
02:33	DTrejo	I've installed it, played around a bit
02:33	kadaver	DTrejo: lisp+emacs works very well together, that said you can run a repl in eclispe too so if you are more comfortable with that...
02:33	hiredman	clojurebot: clojure-dev is the eclipse plugin http://code.google.com/p/clojure-dev/
02:33	clojurebot	Alles klar
02:33	kadaver	ah
02:34	durka42	~eclipse
02:34	clojurebot	I don't understand.
02:34	DTrejo	has anyone tried out multiple configs/ides/editors? which is the most well developed?
02:34	DTrejo	err, best user experience
02:35	hiredman	well, vim, obviously :P
02:35	DTrejo	(:))
02:35	durka42	;)
02:35	DTrejo	I'll look into it
02:35	DTrejo	the link is on the clojure site? for the vim config file or whatever
02:35	Raynes	DTrejo: I use Enclojure with NetBeans 6.5.
02:36	DTrejo	how is that raynes?
02:36	DTrejo	how do you like it
02:36	Raynes	I love it, it works fine for my needs. It's a bit buggy, but everything is being worked out. Clojure-dev would be okay if it weren't for the crappy indentation.
02:36	Raynes	I hear that will be fixed soon as well.
02:36	DTrejo	mm
02:37	DTrejo	hiredman is the situation similar for cloj on vim?
02:38	Raynes	I'd have to say the best possible editor to use for Clojure is Emacs, but if you don't want to go through setting it up and stuff then use Enclojure or La Clojure. I for one, don't feel like setting up Emacs so I use Enclojure. I hear VimClojure is good as well.
02:38	hiredman	I don't think I am person to ask
02:38	hiredman	I don't go in for much besides syntax highlighting
02:38	hiredman	vimclojure's repl is nice, when I get it to work
02:38	DTrejo	k
02:39	hiredman	are you on windows?
02:39	DTrejo	yes, xp
02:39	hiredman	you might look at clojure in a box
02:39	DTrejo	I have the same emecs setup shyness
02:39	hiredman	which is something that installs clojure+emacs
02:39	DTrejo	nice
02:39	DTrejo	that looks so easy :)
02:40	DTrejo	have you tried it Raynes ?
02:40	Raynes	DTrejo: Nope.
02:41	Raynes	I'm a NetBeans man. (:
02:41	Raynes	Plus if I don't test for Eric he never seems to get Windows specific bug reports. I'm one of the few Vista users around these parts :\
02:42	DTrejo	mm
02:43	DTrejo	the guy who put together clojure box needs to host it on some faster server
02:43	DTrejo	err host it on some filehost
02:43	Raynes	,(println "Welcome to the wonderful world of Clojure DTrejo :)")
02:43	clojurebot	Welcome to the wonderful world of Clojure DTrejo :)
02:45	DTrejo	,(+ 60 9)
02:45	clojurebot	69
02:46	Raynes	DTrejo: clojurebot is hiredman's work. hiredman is my hero <3
02:46	DTrejo	I was thinking: wow hiredman knows how to use the bot
02:46	DTrejo	cool project
02:49	DTrejo	loving clojure box :)
02:49	DTrejo	thanks for the recommendation
02:58	DTrejo	~eclipse
02:58	clojurebot	Huh?
03:01	Raynes	It seems even the people who /use/ Scala don't seem to like it very much.
03:02	Raynes	DTrejo: http://code.google.com/p/clojure-dev/
03:04	DTrejo	Raynes yes I tried that. That's too bad about scala
03:04	DTrejo	I know a guy who likes it tho
03:05	Raynes	DTrejo: It's just odd, when I see the enthusiasm people have about Clojure, and then look at what the Scala community is saying, it's as dull as it gets.
03:05	DTrejo	Raynes ohh you're saying they aren't in love with clojure
03:05	DTrejo	I misunderstood
03:06	DTrejo	well, its cus they already have a substitute I'd say
03:06	DTrejo	it steals their thunder
03:06	Raynes	DTrejo: No, you understood. They aren't enthusiastic about Scala the way Clojure users are enthusiastic about Clojure
03:08	zakwilson	That's sad. I'm thinking maybe I should take that as a sign to not bother with Scala.
03:09	DTrejo	oh, ok
03:09	Raynes	zakwilson: I'm trying to learn Clojure, but when I hear stuff like that about it, it really takes away my motivation. :\| Maybe I should just learn Smalltalk for object orientation. :\
03:09	DTrejo	glad you clarified
03:09	Raynes	Scala*
03:09	Raynes	I can't type tonight. :\|
03:09	DTrejo	now everythings all mixed up hehe :)
03:09	DTrejo	how is smalltalk? I don't hear much about it
03:10	DTrejo	I mean the community
03:10	zakwilson	I suppose it depends on why you want to learn OO, or what you want to learn about it.
03:10	Raynes	DTrejo: I dunno. Pretty dead as far as I can tell.
03:11	zakwilson	Though I had some exposure to C++ and such, the first object system I really used was CLOS.
03:11	DTrejo	too bad
03:11	Raynes	zakwilson: Because I'll never get very far without decent knowledge of object orientation. But I really... Really don't want to learn Java or C#.
03:11	DTrejo	zakwilson: I wish lisp had been my first language, like a buddy of mine - he took it for 4 years in HS
03:12	zakwilson	Raynes: Well, I'm not sure about not getting very far... the basic concepts are simple enough.
03:12	DTrejo	and had a hardass funciontional fanatic teacher
03:12	zakwilson	Lisp wasn't my first language, but it's the first language I did non-trivial OO in.
03:13	DTrejo	Ideally I want to know clojure, python, maybe R/ROR. (already decent in java)
03:14	Raynes	I could learn Python, it has some object orientation.
03:14	Raynes	:\|
03:14	DTrejo	mostly I just need to get out there and code, starting this summer when things open up
03:14	DTrejo	Raynes why that face?
03:14	zakwilson	Raynes: you may want to make an object system, or study one implemented in the language from which it is used.
03:15	zakwilson	I think somebody made one for Clojure
03:17	DTrejo	what languages do you know right now Raynes ?
03:17	Raynes	DTrejo: Clojure, some Haskell, and enough Java to know a little about object orientation.
03:18	DTrejo	I thought cloj had some OO
03:18	zakwilson	Wow... good choices!
03:18	zakwilson	It has some OO-like things, but they don't work in the traditional way.
03:18	zakwilson	Traditional being Smalltalk/Ruby/Python/Java-like
03:19	DTrejo	i think clof is more 100yr than arc
03:19	DTrejo	cloj*
03:20	DTrejo	opinions?
03:20	zakwilson	I think Arc has not been developed enough to tell.
03:20	DTrejo	mm
03:20	DTrejo	yes
03:20	Raynes	DTrejo: Arc could probably be good, but Paul Graham will end up dying of old age before he gets 0.0.4 out :\
03:20	zakwilson	Clojure feels like a great language for the next decade, and it probably has a lot of what a 100 year language will have.
03:21	zakwilson	Arc feels really unfinished. I'm sure revision 3 of Clojure did too.
03:22	DTrejo	I think clojure is going to do well just because it has a great pursuasive website. Really is open about the nature of itself
03:23	DTrejo	and the community of cours
03:23	DTrejo	Raynes I agree
03:23	zakwilson	It convinced me to use the JVM. That's impressive pursuasion right there.
03:23	DTrejo	:)
03:24	Raynes	http://stackoverflow.com/questions/743256/why-does-scala-have-very-little-enthusiasm-about-it Get your thoughts in before it's closed.
03:25	DTrejo	(I don't have anything to say)
03:25	leafw	s/pursuasive/persuasive
03:25	leafw	(hurts my eyes :)
03:26	DTrejo	I don't understand the slashes, what does that mean?
03:26	DTrejo	[sic] ?
03:27	zakwilson	My only attempt at using stack overflow didn't impress me.
03:27	Raynes	DTrejo: It's a regex s/replacethis/withthis/
03:28	zakwilson	http://stackoverflow.com/questions/513523/what-language-features-can-you-live-without-closed
03:31	leafw	DTrejo: in vi editor, it means "substitute first expr. by second expr."
03:31	DTrejo	ah
03:31	DTrejo	now I know more
03:31	leafw	DTrejo: in skype, it fixes typos in previous lines as well.
03:34	DTrejo	oh dang
03:34	DTrejo	s/dang/dangg
03:34	DTrejo	aw it doesn't work here
03:34	leafw	no, IRC is a different beast.
03:38	Raynes	DTrejo: Though it doesn't work in IRC, users use it as symbolism to correct their previous messages.
03:40	zakwilson	I have not seen any signs of that actually altering a conversation in skype.
03:40	Raynes	http://xkcd.com/528/
03:49	leafw	zakwilson: AFAIK only works in macosx skype.
03:49	zakwilson	leafw: that would explain it.
03:50	DTrejo	so it updates other people's screens too?
03:52	leafw	I think so.
03:52	leafw	very orwellian.
03:54	DTrejo	mm, another reason for me to get a mac
03:54	DTrejo	haha
04:01	Raynes	http://stackoverflow.com/questions/743256/why-does-scala-have-very-little-enthusiasm-about-it/743285#743285
04:01	Raynes	The man has a point.
04:05	leafw	yes: clojure is the first JVM language that attracted people per se, not by the need of avoiding the horror of writing java code.
04:08	zakwilson	leafw: agree - I might never have used the JVM without Clojure.
04:16	leafw	with our fiji setup, one isn't even aware of the JVM at all ... I can launch clojure with all jars in classpath just with ./fiji --clojure
04:17	leafw	( http://pacific.mpi-cbg.de/wiki/index.php/Clojure_Scripting )
06:00	joha1	I'm translating Java code with the "instanceof" operator. How can I express this in Clojure? (.instanceOf ...) didn't work
06:02	joha1	nor (.instanceof ...)
06:07	antifuchs	(isa? (class object) TheDesiredClass) ; wfm
06:07	joha1	aha, (instance? <class> <obj>) seems to work
06:08	antifuchs	oh, heh. looks like I should rewrite some of my code, then (:
06:08	antifuchs	thanks, joha1 (:
06:08	joha1	np
06:15	Raynes	joha1: There is also instance?
06:15	Raynes	,(instance? Integer 3)
06:15	clojurebot	true
06:16	joha1	yes, I just found instance? in the API doc
06:17	Raynes	And class?
06:17	Raynes	Which is less useful, but still. :)
07:32	yason	How to extract the local name out of a fully qualified symbol?
07:36	leafw	,(doc name)
07:36	clojurebot	"([x]); Returns the name String of a symbol or keyword."
07:36	leafw	yason: I guess that answers it.
07:40	mihand	hey guys. do next and rest differ only in how they handle empty seqs?
07:41	leafw	mihand: no.
07:41	mihand	in core they seem to have runtime support
07:41	leafw	mihand: rest is eager, I think.
07:43	mihand	did rest change recently? because i have the feeling that in the screencasts it returned nil
07:43	durka42	yes
07:44	durka42	rest changed with the introduction of lazy sequences
07:44	durka42	you should now use next instead, unless you are writing a lazy seq
07:45	leafw	mihand: it changes about 2 months ago or so
07:45	mihand	thanks
08:47	powr-toc	Hey... I was wondering, is there an idiomatic clojure way to wrap an object into a seq-able abstraction?
08:48	powr-toc	assuming I have a java object that's similar to an Iterator
08:50	powr-toc	I've seen there is iterator-seq... the problem is I don't have an iterator
08:50	powr-toc	or rather, the object doesn't implement Iterator directly
08:55	powr-toc	Ok, just looking at re-seq's implementation... looks like the pattern is to use lazy-seq to build a sequence out of consing iterations together...
08:59	yason	leafw: yes, thanks! exactly what I was looking for
10:54	StartsWithK	fyuryu: hi, your the author of cloak?
12:22	fyuryu	StartsWithK: hi, yes
12:23	StartsWithK	hi again :)
12:23	StartsWithK	whats the state of cloak?
12:23	StartsWithK	i looked at it, last update was 2 months ago
12:24	StartsWithK	it looks good, i would like to use it to replace someting like 40-60 ant builds, they are all small script and call external programs like jar or ant, svn..
12:25	StartsWithK	is this kind of thing you had in mind for cloak?
12:25	fyuryu	StartsWithK: needs an update, some of the code that I've written for it is now in contrib
12:25	StartsWithK	can it be usead as library?
12:25	gnuvince_	What's cloak?
12:26	hiredman	"simple automation tool inspired by rake, written in Clojure"
12:26	fyuryu	StartsWithK: are you familiar with rake?
12:26	StartsWithK	any plans for, lets say that rm could be more sensitive to content, like if do rm in svn project, it uses svn remove
12:26	StartsWithK	fyuryu: to some extent, i used buildr
12:26	StartsWithK	and rake is just a thing i would like to use, light, simple..
12:27	StartsWithK	or things like (cp ["%s/text.file" root-dir] ["%s/dest.file" dest-dir])
12:27	fyuryu	StartsWithK: the idea was to automate calling external commands
12:28	fyuryu	and have some Clojure/Java specific bonuses (eq. compiling)
12:28	StartsWithK	so you have a CA signed?
12:29	fyuryu	StartsWithK: yes, I sent one, but don't know if Rich got it
12:30	fyuryu	StartsWithK: it is also possible to use cloak with Lancet - that gives you access to all the ant tasks
12:30	fyuryu	and there are a lot of them
12:31	StartsWithK	well my build is ant, i would like to use just cloack, looked at lancet and skipped it
12:31	StartsWithK	cloak*
12:32	fyuryu	one thing that Lancet doesn't have is resolving circular dependencies
12:32	StartsWithK	also, i see for now only one problem
12:32	StartsWithK	it has no build system
12:32	StartsWithK	in ant
12:33	Drakeson	Do you have a snippet to put in user.clj that `use's all utilities in contrib, as their name? conceptually: (doseq [x clojure-contrib-libraries] (use '[clojure.contrib.x as x]))
12:33	StartsWithK	i would need something like that so i cn bootstrap my build
12:33	StartsWithK	would you accept such a patch?
12:33	fyuryu	StartsWithK: you mean an build.xml to compile cloak?
12:33	StartsWithK	yes
12:33	lisppaste8	lethe pasted "xml-zip filtering" at http://paste.lisp.org/display/78492
12:34	lethe	Why does xml1-> in ^ seem to return a function and not the location?
12:35	fyuryu	StartsWithK: yeah, I was supposed to write that, but since I hava a special script with CLASSPATH for cloak set, I forgot about it
12:35	fyuryu	StartsWithK: but sure, a patch would be nice :-)
12:36	StartsWithK	fyuryu: ok, i'll find you in couple of days when i sort cloak intergation with my build
12:36	StartsWithK	thanks for replays
12:36	fyuryu	StartsWithK: will you be doing any Clojure code compilation from cloak?
12:37	StartsWithK	fyuryu: only calling of ant thro shell
12:37	StartsWithK	some jar manipulations and svn git hg checkouts
12:38	fyuryu	StartsWithK: ah, ok. Just wanted to be sure you are aware abt. the standard CLASSPATH pains
12:38	StartsWithK	will it run ok if i call multiple cloak files (separate processes) from inside ant <parallel> task?
12:40	powr-toc	Is there a reason why (seq? []) returns false?
12:40	fyuryu	StartsWithK: it should, unless you're going to try to access the same resources from different processes
12:40	powr-toc	I thought vectors were sequences
12:40	fyuryu	StartsWithK: etc
12:40	dakrone_hb	,(seq? [])
12:40	clojurebot	false
12:40	powr-toc	,(seq? ())
12:40	clojurebot	true
12:41	StartsWithK	fyuryu: thanks
12:41	gnuvince_	powr-toc: it implementes the sequence interface
12:41	hiredman	vectors are not seqs
12:41	gnuvince_	,(iseq? [])
12:41	clojurebot	java.lang.Exception: Unable to resolve symbol: iseq? in this context
12:41	fyuryu	StartsWithK: you're welcome
12:41	hiredman	,(seq? (seq []))
12:41	clojurebot	false
12:41	hiredman	well
12:41	hiredman	,(seq? (seq [1]))
12:41	clojurebot	true
12:41	dakrone_hb	,(list? [])
12:41	clojurebot	false
12:42	hiredman	a seq is a view over a collection
12:42	dakrone_hb	,(set? [])
12:42	clojurebot	false
12:42	dakrone_hb	,(vector? [])
12:42	clojurebot	true
12:42	powr-toc	hiredman: Then is there a common (testable) abstraction across vectors, lists and hashmaps?
12:43	hiredman	yeah
12:43	hiredman	,(ancestors (class []))
12:43	clojurebot	#{clojure.lang.IPersistentStack clojure.lang.Seqable java.util.RandomAccess clojure.lang.Counted clojure.lang.Sequential java.util.List clojure.lang.IPersistentVector clojure.lang.IFn clojure.lang.Associative java.lang.Runnable clojure.lang.IObj java.util.Collection java.io.Serializable clojure.lang.IPersistentCollection clojure.lang.Reversible clojure.lang.IMeta java.util.concurrent.Callable clojure.lang.Streamable java.
12:44	hiredman	,(ancestors (class {}))
12:44	clojurebot	#{clojure.lang.Seqable clojure.lang.Counted java.util.Map clojure.lang.IFn clojure.lang.Associative java.lang.Runnable clojure.lang.IObj java.io.Serializable clojure.lang.IPersistentCollection clojure.lang.IMeta java.util.concurrent.Callable java.lang.Iterable clojure.lang.IPersistentMap java.lang.Object clojure.lang.Obj clojure.lang.APersistentMap clojure.lang.AFn}
12:44	hiredman	actully
12:44	hiredman	I think you should just use coll?
12:44	dakrone_hb	,(seqable? [])
12:44	clojurebot	java.lang.Exception: Unable to resolve symbol: seqable? in this context
12:44	hiredman	,(coll? [])
12:44	clojurebot	true
12:45	hiredman	,(coll? (java.util.ArrayList.))
12:45	clojurebot	false
12:45	hiredman	erm
12:45	hiredman	,(doc coll?)
12:45	clojurebot	"([x]); Returns true if x implements IPersistentCollection"
12:45	hiredman	I see
12:45	powr-toc	hiredman: cheers... that's exactly what I'm after
12:46	hiredman	(instance? java.util.Collection [])
12:46	hiredman	,(instance? java.util.Collection [])
12:46	clojurebot	true
12:46	hiredman	even more general
12:46	hiredman	and seq works on most (all?) Collections
12:46	hiredman	,(seq (java.util.ArrayList. [1 2]))
12:46	clojurebot	(1 2)
12:47	hiredman	I kind of assumed coll? was a test for java.util.Collections
12:49	hiredman	,(seq (java.util.HashMap. {:a 1}))
12:49	clojurebot	(#<Entry :a=1>)
12:49	hiredman	,(first (first (seq (java.util.HashMap. {:a 1}))))
12:49	clojurebot	java.lang.IllegalArgumentException: Don't know how to create ISeq from: Entry
12:50	hiredman	,(seq (first (seq (java.util.HashMap. {:a 1}))))
12:50	clojurebot	java.lang.IllegalArgumentException: Don't know how to create ISeq from: Entry
12:50	hiredman	interesting
12:52	marklar	How do you type hint the Math.abs function? java.lang.Math/abs is showing a reflection warning
12:52	Chouser	marklar: it wants to know the type of the arg
12:53	marklar	Chouser: Ah, thanks
13:32	twansit	hmm.. can someone show me a example of using the 'update-in' function?
13:34	twansit	disregard ... got it.
13:35	hiredman	http://log.damog.net/2009/04/rubx-twitters-ruby-shell/
13:35	hiredman	oooo
13:37	leafw	"her"
13:37	leafw	clever way to gather publicity.
13:38	hiredman	I guess I'd better write a real twitter interface to start
13:43	cp2	heh
14:22	hiredman	I do feel slightly unmaned by the fact that every attempt (of mine) at translating a java twitter poster to clojure seems to result in 401's
14:24	technomancy	hiredman: running into API limits?
14:25	technomancy	I'm trying to write a function to return the absolute filename of the caller. I tried using .getStackTrace on a new Throwable, but that doesn't give the full path, just the base name.
14:25	technomancy	any ideas?
14:26	technomancy	sorry, the absolute file name of the file containing the caller
14:26	hiredman	the caller of a function?
14:26	technomancy	yes
14:27	hiredman	hmmm
14:27	technomancy	this is what I've got that gives me the base name: (defn caller-file [] (.getFileName (second (.getStackTrace (Throwable.)))))
14:27	technomancy	but StackTraceElement doesn't seem to have any other methods that deal with filenames
14:28	hiredman	r1349
14:29	hiredman	that might help, if that information is then propagated in the stacktrace
14:29	technomancy	interesting; thanks
14:30	technomancy	I get the feeling like it's trying to protect me from thinking about whether a file is source on disk or compiled in a jar or something, but in this case it's getting in the way.
14:30	Chouser	but vars and fns are very different things
14:33	Chouser	technomancy: it's entirely possible the information you want is simply not stored anywhere that you can get to
14:34	Chouser	technomancy: you can't redefine the problem at all? use a macro call instead of a function call, for example?
14:40	technomancy	oh, if I used a macro I would have access to file; is that right?
14:40	Chouser	source-path yeah
14:41	technomancy	thanks
14:42	technomancy	hrm; source-path is a relative filename as well.
14:43	Chouser	yeah, just noticed that.
14:43	Chouser	what are you using to load the file? 'require', 'load-file'?
14:43	technomancy	it'd be load-file since it's not on the classpath
14:44	Chouser	you were right: file
14:57	hiredman	google code is dead
15:02	leafw	hiredman: http://code.google.com/ ?
15:03	hiredman	leafw: requests for project pages like http://code.google.com/p/java-twitter/ are timing out
15:08	hiredman	I really wish I could figure this twitter thing out
15:09	hiredman	shelling out to curl is lame, and the code seems simple enough, every example I have seen is so similar that I can code it from memory
15:12	hiredman	I wonder if it is a user-agent thing
15:15	pjstadig	what's up with code.google.com lately?
15:18	hiredman	weird
15:19	hiredman	when I change my username I get two requests in the logs
15:48	hiredman	java.io.IOException: Not enough storage is available to process this command
15:48	hiredman	bah
17:40	technomancy	sets are unordered by default, right?
17:40	technomancy	so conj'ing on to them could add the new value at any position?
17:41	gnuvince_	technomancy: hash-sets, yes.
17:41	technomancy	if inventory is a ref to a regular set, this seems to work: (str-join "\n " (conj @inventory "You are carrying:"))
17:42	technomancy	but in this case it's working by coincidence, right?
17:42	technomancy	there's no guarantee
17:51	Chouser	technomancy: but use (seq @inventory) instead to get consistent results
17:59	technomancy	oh sure; that works. I think it's cleaner to put the message outside the str-join though.
18:25	Chouser	sure
18:29	powr-toc	Is there a clojure equivalent of Ruby's String#succ http://www.ruby-doc.org/core/classes/String.html#M000794
18:29	powr-toc	that'd turn a string of "abcd" into "abce"
18:34	Cark	powr-toc : have a look in tge java luibrary, i wouldn't bet on it though
18:35	powr-toc	Cark: it's nto
18:35	powr-toc	not
18:36	Cark	i wonder what's the use case =)
18:37	powr-toc	being able to generate sequential names
18:42	technomancy`	what's a good way to generate a filename that's based on a URL?
18:43	technomancy`	was thinking of either replacing all illegal-in-filename chars or just hashing it.
18:44	powr-toc	technomancy`: hashing it is probably the easiest way... but if you want them to be human readable then you have to replace chars
18:44	technomancy`	yeah, I don't think human-readability is important here
18:47	technomancy`	hrm; looks like to calculate SHA1 with Java you need to do it a byte at a time?
18:49	technomancy`	never mind
18:50	powr-toc	technomancy`: Yeah, I think so... Checkout Integer.toHexString though
18:51	lisppaste8	dnolen pasted "md5" at http://paste.lisp.org/display/78517
18:52	dnolen	perhaps someone might find this useful, I converted it from an example I found somewhere on the Internet, short and sweet.
18:52	technomancy`	thanks
18:52	powr-toc	dnolen: nice...
18:53	technomancy`	short for Java anyway. =)
18:54	dnolen	;)
18:55	aperotte	hello everyone
19:11	technomancy`	I'm a little shaky on Java IO; how would you finish this snippet to write the contents of a URL to disk? (with-open [in (reader url) out (writer filename)] [...])
19:12	technomancy`	some kind of variation on this I guess? (while (not (eof? in)) (print (read-line)))
19:20	st3fan	is there a concept like Python's yield in Clojure?
19:28	Cark	stefan : we do loops from the outside with constructs like map and reduce
19:30	technomancy`	I'm trying to instantiate a CharBuffer for writing data to disk... what's wrong with this? (java.nio.CharBuffer. (make-array Character 1000))
19:31	Cark	isn't there an allocate static function on char buffers ?
19:31	technomancy`	ah, I didn't realize that's what it was for; thanks
19:33	technomancy`	oh... but writers don't work with CharBuffers.
19:35	technomancy`	silly me for assuming that readers and writers worked the same way.
19:35	Cark	but they should work with bytebuffers
19:35	Cark	so just wrap a bytebuffer around your charbuffer (i guess)
19:36	technomancy`	nope, the reader won't work with a byte buffer
19:37	technomancy`	there's got to be a better way to write the contents of a URL to disk
19:37	Cark	what are the classes of your writer and reader ?
19:37	technomancy`	I'm using duck-streams
19:38	technomancy`	maybe that's a mistake
19:38	Cark	why do you need a charbuffer then ?
19:39	technomancy`	because that's what my reader's .read method accepts
19:39	technomancy`	and I'm assuming read-line and println won't work with binary data
19:40	Cark	ah that's a binary file ?
19:40	technomancy`	well it could be
19:40	Cark	then you surely don't need a charbuffer =)
19:40	Cark	that's some kind of a file copy function ?
19:40	technomancy`	at this point I'm tempted to shell out to curl
19:40	technomancy`	because this should not be ten lines. =\
19:41	Cark	you need to use errr ...one second
19:42	Cark	fileinputstream and fileoutputstream for possibly binary data
19:42	technomancy`	thanks
19:42	technomancy`	java.net.URL could construct the input stream for me, right?
19:43	Cark	hum try passing that to the stream constructor
19:44	Cark	is that doesn't work, there might be some way to convert to a File object
19:48	technomancy`	(.openStream (java.net.URL. "http://technomancy.us"))
19:48	Cark	ah nice =)
19:49	technomancy`	so when I call read on that, how do I know when it's done?
19:50	technomancy`	I'd expect it to throw an exception if I keep reading from it, but it just keeps going forever.
19:50	technomancy`	does it do something silly like return -1?
19:51	technomancy`	hah; it does. wow.
19:51	Cark	don't you loce java programming ?
19:51	Cark	love
19:52	powr-toc	how do you perform a primitive cast in clojure? I want to cast an int as a char
19:52	dnolen	,(char 10)
19:52	dnolen	oops clojurebot is dead
19:53	dnolen	but that should work
19:53	powr-toc	cool
20:16	hiredman	~how much do you know?
20:17	clojurebot	I know 280 things
20:17	hiredman	I guess that'll do
20:21	Chouser	:-)
20:52	powr-toc	how do I flatten a sequence?
20:53	powr-toc	I can't seem to find a function for it
20:53	hiredman	I think there is a flatten in seq-utils in contrib
20:53	hiredman	there is also apply concat
20:54	gnuvince_	,(filter (complement seq?) (tree-seq [1 [2 3 [4 5] 6 7] 8 [9]]))
20:54	clojurebot	java.lang.IllegalArgumentException: Wrong number of args passed to: core$tree-seq
20:54	hiredman	,(apply concat [[1 2 3] [4 5 6]])
20:54	clojurebot	(1 2 3 4 5 6)
20:54	gnuvince_	,(doc tree-seq)
20:54	clojurebot	"([branch? children root]); Returns a lazy sequence of the nodes in a tree, via a depth-first walk. branch? must be a fn of one arg that returns true if passed a node that can have children (but may not). children must be a fn of one arg that returns a sequence of the children. Will only be called on nodes for which branch? returns true. Root is the root node of the tree."
20:56	hiredman	,(tree-seq vector? seq [1 [2 3 [4 5] 6 7] 8 [9]]))
20:56	clojurebot	([1 [2 3 [4 5] 6 7] 8 [9]] 1 [2 3 [4 5] 6 7] 2 3 [4 5] 4 5 6 7 8 [9] 9)
20:58	hiredman	,(re-seq #"\w+" "foo bar baz")
20:58	clojurebot	("foo" "bar" "baz")
20:59	powr-toc	I think apply concat'll do... but I wish flatten was in the core libs
20:59	powr-toc	it seems like a common thing to want to do
20:59	hiredman	,(reduce vector (re-seq #"\w+" "foo bar baz"))
20:59	clojurebot	[["foo" "bar"] "baz"]
20:59	rhickey	Is the person responsible for incanter (http://github.com/liebke/incanter/tree/master) ever here?
21:00	hiredman	,(reduce vector (re-seq #"\w+" [] "foo bar baz"))
21:00	clojurebot	java.lang.IllegalArgumentException: Wrong number of args passed to: core$re-seq
21:00	hiredman	~seen liebke
21:00	clojurebot	no, I have not seen liebke
21:01	hiredman	2009:Apr:13:06:24:59-!- dliebke [n=dliebke@134.192.133.202] has joined #clojure
21:02	rhickey	~seen dliebke
21:02	clojurebot	no, I have not seen dliebke
21:02	hiredman	the seen information doesn't persist
21:16	rhickey	http://lotrepls.appspot.com/
21:20	Chouser	huh
21:20	hiredman	wow
21:20	hiredman	cute
21:24	dliebke	rhickey: Hi, do you have a question about incanter?
21:24	Chouser	all those langages hooked up, and he wrote it in java.
21:24	hiredman	:P
21:25	rhickey	dliebke: Hi - incanter looks neat. I was wondering what you were doing with Colt, and whether you had tried Parallel Colt?
21:26	dliebke	thanks, I've looked at parallel colt in the past, but I'm not using it at this point -- although it might be a good idea
21:27	rhickey	are you happy with Colt?
21:28	dliebke	yes, nice scope, good performance -- better than anything else I've used written in Java
21:29	dliebke	I've extended the colt matrix class and implemented the ISeq interface, which has been really powerful
21:29	rhickey	I've thought about providing direct support for (some of) Colt in Clojure
21:30	dliebke	that would be fantastic!
21:31	rhickey	some sort of DSL for defining/combining Colt Functions
21:34	djkthx	is it possible to have an array of bytes or bits in clojure, instead of just an int-array?
21:34	gnuvince_	djkthx: yes
21:35	hiredman	,(byte \a)
21:35	clojurebot	java.lang.ClassCastException: java.lang.Character cannot be cast to java.lang.Number
21:35	hiredman	,(byte (int \a))
21:35	clojurebot	97
21:35	gnuvince_	,(make-array Byte/TYPE 10)
21:35	clojurebot	#<byte[] [B@15d601f>
21:36	djkthx	ah, nice
21:37	djkthx	didn't realize /TYPE would make it a primitive
21:38	djkthx	thanks
21:40	dliebke	rhicky, I'd like to hear more about your ideas on colt as you flesh them out :)
21:40	djkthx	colt?
21:43	rhickey	dliebke: nothing too radical, just something to let you write functions and chains using normal */+- syntax, plus something to wrap assign to make it functional
21:44	cp2	rhickey: i dont quite understand
21:44	dliebke	djkthx, colt is a numeric library written in Java
21:44	cp2	oh
21:44	cp2	i see
21:44	dnolen	this will be super cool
21:44	dliebke	that would have made it much easier to write incanter :)
21:46	rhickey	there you go
21:48	djkthx	nifty
21:48	rhickey	http://piotr.wendykier.googlepages.com/parallelcolt
21:49	gnuvince_	When they say "high performance numeric library", do they mean for complex numeric types or even for simple ints?
21:49	cp2	20:37 ::: netjoin/#clojure rhickey (n=rhickey@ool-457e4394.dyn.optonline.net)
21:49	cp2	er
21:49	cp2	JCublas provides Java bindings for the NVIDIA CUDA BLAS implementation, thus making the parallel processing power of modern graphics hardware available for Java programs.
21:49	cp2	awesome
21:53	dliebke	gnuvince_: all my work with colt has been with doubles, I don't think it supports complex numbers or ints.
21:55	gnuvince_	ok
21:57	arohner	rhickey: I've seen a few people mention the idea of gradual typing recently. What is your opinion on gradual typing in clojure?
22:44	toplay22	Hey, I'm having problems with the interactions between clojure and slime.
22:45	toplay22	I'm using clojure-mode (which uses slime and swank-clojure), but in Emacs when I do a "M-x slime", it takes a REALLY long time to finally connect.
22:45	toplay22	I get this error:
22:46	toplay22	Polling "/tmp/slime.29096".. (Abort with `M-x slime-abort-connection'.) [644 times]
22:47	toplay22	But it eventually connects.
22:47	toplay22	I don't have any trouble using another lisp, like sbcl or cmucl.
22:48	gnuvince_	toplay22: how long is a really long time?
22:50	toplay22	About 10 minutes.
22:52	gnuvince_	Are all your versions up to date? Clojure, slime, clojure-swank?
22:56	toplay22	yes
22:59	toplay22	Do you know of any way I can get more information about why it is just repeatedly polling and not connecting?
23:03	toplay22	Oh, and this is why happens in the buffer that is starting the inferior-lisp:
23:03	toplay22	http://pastebin.com/m21ca2c11
23:04	toplay22	*why happens -> what happens