#clojure – 2009-08-28

2009-08-28

00:01	technomancy`	heh... now I've switched it back and can't repro.
00:01	technomancy`	should have checked it in I guess
00:02	technomancy`	or at least stashed
00:02	cark	=)
00:04	technomancy`	http://github.com/technomancy/sketchbook/tree/master <= if you're curious
00:04	technomancy`	having some fun with Processing
00:04	technomancy`	even if the language itself is crap, calling it from Clojure is pretty nice.
00:05	krumholt__	can someone tell me why (java.nio.IntBuffer/wrap (into-array [1 2 3 4 5])) is not working?
00:06	krumholt__	ah i allready know
00:06	cark	,(int-array [1 2 3 4])
00:06	clojurebot	#<int[] [I@172bab9>
00:06	krumholt__	yes that its
00:06	krumholt__	thank you very much
00:06	cark	,(into-array Integer/TYPE [1 2 3 4])
00:06	clojurebot	#<int[] [I@26b12d>
03:46	AWizzArd	hiredman: ping
03:58	eevar2	anyone here with commit rights to sourceforge's clojure-contrib?
04:00	eevar2	i think someone should make a commit cleaning out all the files, like on google code. but maybe get rid of the license files as well; don't really need 3-4 different licenses to go along with your text file explaining that the project has moved
04:03	vIkSiT	hi all
04:03	vIkSiT	anyone around?
04:03	vIkSiT	I'm getting a compilation error on def.clj in clojure-contrib at line 106
04:04	vIkSiT	[java] java.lang.Exception: Unable to resolve symbol: next in this context (def.clj:106)
04:04	vIkSiT	any ideas?
04:05	eevar2	sure you use compatible versions of clojure and the contrib source? i.e. both from master, or both from an 1.0-branch on github?
04:09	vIkSiT	eevar2, hmm I think I have, although let me refresh to make sure
04:12	vIkSiT	eevar2, I guess I could use both versions from master?
04:13	AWizzArd	sounds good
04:14	eevar2	yes, master and the 1.0 branches aren't compatible
04:15	eevar2	trying to build (master) here now. just in case ;)
04:15	vIkSiT	curiously - vimclojure vs emacs-slime as mode of choice?
04:15	opqdonut	emacs
04:15	eevar2	enclojure :p
04:16	vIkSiT	does anyone here use vimclojure at all? :)
04:16	eevar2	if you're already damaged, you might as well stick with emacs
04:16	vIkSiT	hehe eevar2 - except, moved to using vim after that because of ssh and not liking emacs -nw - and now like it better
04:17	vIkSiT	hehe
04:19	eevar2	my build of clojure, contrib & compojure, current master branch, went ok
04:24	AWizzArd	vIkSiT: I use emacs+slime. The author of VimClojure is often here (but not right now). Has many happy users.
04:25	vIkSiT	ah
04:25	AWizzArd	Last time I checked VimClojure had unique features. For example it can autocomplete the names of static methods.
04:37	vIkSiT	ah I see
04:37	vIkSiT	alrighty, thanks all
06:44	G0SUB	How do I access the values of a Java HashMap?
06:45	G0SUB	(mymap "key") throws an error. says it can't be cast into an IFn
06:45	G0SUB	keys are strings, by the way
06:45	AWizzArd	Use the method get
06:45	AWizzArd	(.get mymap "key")
06:46	G0SUB	AWizzArd: any way to convert that HashMap to an IFn?
06:46	jdz	i think into works, like (into {} mymap)
06:46	AWizzArd	Yes, use into
06:46	G0SUB	jdz: interesting. thanks.
06:47	AWizzArd	G0SUB: if your Map is very big then this operation is maybe not required.
06:48	AWizzArd	you could leave it as a j.u.HM
06:48	G0SUB	AWizzArd: makes sense
06:49	AWizzArd	Especially if it is a read-only object. When there are no writers, then read access is thread-safe
06:57	ole3	Hello, I have to syncronize access to a struct.
06:57	ole3	Is it better to put the whole struct into a reference or let the slot be references?
07:06	ole3	ok
07:14	AWizzArd	in most cases it would make sense to put a whole struct instance into a ref.
07:14	AWizzArd	But, it can also make sense to have refs in refs, if you need to keep identity of objects in a collection which itself is in a ref.
07:17	ole3	well in my struct is a stack and i have to push and pop elements from it.
07:18	ole3	it is easy if that stack is in a ref.
07:48	Fossi	ole3: that sounds as if the stack should be one ref
07:57	Licenser	hmmm I wanted to write a few macros that make some things in compojure easyer (namely adding restfull resources) I'm not getting far sadly :/. I wonder if someone could be so nice and take a look and help me out? http://gist.github.com/176928 (as a warning I'm a beginner)
07:58	Fossi	might be totally unrelated, but the appengine has a deadline after 30 seconds and it's the second time that it fails while starting up in Keyword.intern/ConcurrentHashMap.putIfAbsent
08:02	ole3	Fossi & AWizzArd: thanks for the response, the stack is now the ref.
08:10	Chousuke	Licenser: what do you seek to accomplish with that let in the resource macro?
08:11	Chousuke	oh, I see now. that won't work.
08:11	Licenser	that the 'inner macros' like list_items know how the resource is named
08:11	Licenser	I noticed that
08:11	Chousuke	,(list `foo# `foo#)
08:11	clojurebot	(foo__2476__auto__ foo__2477__auto__)
08:11	Chousuke	autogensyms in different syntax quotes are never the same.
08:11	Licenser	I fear it's even 'bad style' since the macros like list_items would not be how is it clled, a function of it's values
08:12	Licenser	nods
08:12	Licenser	okay again something learned
08:12	Chousuke	you should instead make those macros use some globally bound resource-name
08:12	Licenser	o.o
08:12	Licenser	isn't that very badish?
08:12	Chousuke	then do (binding [resource-name whatever] (some-macros-here) (some-more-here))
08:12	Licenser	ah okay binding localizes it?
08:13	Chousuke	dynamic global bindings are very common in lisps, and in clojure.
08:13	Fossi	who would be responsible for the Keywork.java code? rhickey?
08:13	Licenser	I love the (doc thing)
08:13	Chousuke	there are no global (uncontrolled) variables in clojure so it's all fine.
08:13	Licenser	Okay
08:14	Chousuke	also, don't use underscores
08:15	Chousuke	list-items, get-item, etc. are better.
08:15	AWizzArd	Fossi: yes
08:15	Licenser	Okay, thanks for the advice
08:15	Fossi	AWizzArd: k, i'll ask him later then
08:15	Licenser	wow something is working!
08:17	Licenser	okay it compiles, now just to get it working too ^^
08:18	Chousuke	Licenser: also instead of all those nths you could do `(let [~p [(params :id)]] ...) or `(let [~p [(params :id) params]] ...)
08:19	Chousuke	eg. use destructuring.
08:19	Licenser	hmm sneaky
08:19	Chousuke	eh, not eg; ie. ;(
08:19	Licenser	thanks
08:19	Fossi	destructuring is the shit.
08:20	AWizzArd	??
08:20	AWizzArd	Wieso dasn?
08:20	Fossi	the shit. ask google :)
08:25	Chousuke	Licenser: http://gist.github.com/176962 this should work
08:25	Licenser	so *
08:26	Licenser	looks at it
08:26	Chousuke	your (do ~@body)'s were superfluous so I removed the dos
08:26	Licenser	hmm why ~'resource-name in the one macro?
08:26	Licenser	okay I had that from the macro documentation ^^
08:26	Chousuke	because otherwise it would become qualified.
08:27	Chousuke	and you can't bind to qualified names I think
08:27	Licenser	ah it would resolve to the value you mean
08:27	Chousuke	no, I mean
08:27	Chousuke	,`warn-on-reflection
08:27	clojurebot	clojure.core/warn-on-reflection
08:27	Chousuke	,`~'warn-on-reflection
08:27	clojurebot	warn-on-reflection
08:28	Chousuke	maybe it's possible to use binding with qualified names though.
08:28	Chousuke	but with let it fails :)
08:28	Chousuke	(it helps people to not shoot themselves in the foot with macros)
08:28	Licenser	yes with let it did, I tried something like that :P
08:29	Chouser	binding is on vars, so it gets qualified either manually or automatically.
08:29	Licenser	I wanted to shoot myelf in the foot, or nearly did
08:29	G0SUB	Is it possible to create private defmulti & defmethods ? like defn- ?
08:29	Chousuke	(defmulti #^{:private true} foo)
08:29	G0SUB	Chousuke: Thanks. What about the defmethods?
08:29	Chousuke	they can't be private I think.
08:30	Chouser	you don't call them directly anyway -- they are reachable through the multi, so if that's private you're safe.
08:31	Licenser	hmmm
08:31	G0SUB	cool
08:31	G0SUB	Chousuke: I put the same metadata after the defmethod. it compiled fine.
08:31	Licenser	when a function takes arguments like (function a1 b1 a2 b2) can I pass it a list too?
08:31	Licenser	it will destruct it right?
08:32	Chouser	G0SUB: that metadata is probably being ignored.
08:32	G0SUB	Chouser: right.
08:32	Fossi	Licenser: you can use apply the list
08:32	Fossi	today no english me
08:32	Licenser	hmm hmm
08:33	AWizzArd	,(re-find #".* \(" "foo (bar)")
08:33	clojurebot	"foo ("
08:33	AWizzArd	but I want only "foo"
08:33	G0SUB	What is the best way to figure out if the arg to a defmethod is a HashMap? I am using (identical? (type arg) (type {}))
08:34	Chousuke	AWizzArd: use capturing groups and take the first group? :/
08:34	G0SUB	,(re-find #"(.*) \(" "foo (bar)")
08:34	clojurebot	["foo (" "foo"]
08:34	G0SUB	,(re-find #"(.*) \(" "foo (bar)")[1]
08:34	clojurebot	["foo (" "foo"]
08:34	Chouser	,(re-find #".*(?= \()" "foo (bar)")
08:34	clojurebot	"foo"
08:35	AWizzArd	G0SUB: you can use instance? for the check
08:35	Chousuke	oh, right. :)
08:35	Chouser	positive zero-length lookahead assertion
08:35	AWizzArd	,(instance? java.util.HashMap (java.util.HashMap.))
08:35	clojurebot	true
08:35	Chouser	,(map? {})
08:35	clojurebot	true
08:36	AWizzArd	,(map? (java.util.HashMap.))
08:36	clojurebot	false
08:36	AWizzArd	so I check in my programs for being java.util.Map
08:36	AWizzArd	because I need to capture all those cases
08:36	AWizzArd	,(doc map?)
08:36	clojurebot	"([x]); Return true if x implements IPersistentMap"
08:36	Chouser	ah
08:37	AWizzArd	Chouser: are you in for a very hard regex again? ;-)
08:37	AWizzArd	I think it is so hard that noone here can solve it.
08:37	Chouser	heh. well, statements like that are a good way to get me interested
08:38	AWizzArd	I got some funny file format that someone invented and I parse it with a function now. But I think a regex may be able to do it too.
08:38	AWizzArd	I have a string, similar to .csv, in which columns are separated either by , or ;
08:38	AWizzArd	"15,hello;30;4"
08:38	AWizzArd	but...
08:39	AWizzArd	it also contains strings in which , or ; may show up. Those should not be splitting. These strings are marked by the entries BEGIN;now some,,;;string is here;; with no\n splitting.;ENDTEXT;
08:41	AWizzArd	"93257,1257 ;1;341;NULL;BEGINTEXT,[zzz] MR813.txt[2009-04-21 14:44];ENDTEXT;BEGINTEXT;>> \r\n>> Hello, it is good; but not now. \"It\" is.\r\n>> Ok;ENDTEXT;BEGINTEXT;NULL,ENDTEXT;BEGINTEXT,NULL;ENDTEXT"
08:41	AWizzArd	This is an example input
08:41	Chouser	wow. so pretty.
08:42	AWizzArd	and it should split into "93256" "1257 " "1" "341" "NULL" "[zzz] MR813.txt[2009-04-21 14:44]" ">> \r\n>> Hello, it is good; but not now. \"It\" is.\r\n>> Ok" "NULL" "NULL
08:42	jdz	and nobody ever puts BEGINTEXT etc in those fields?
08:42	jdz	:)
08:42	AWizzArd	I hope. I don't know who invented it sigh
08:43	AWizzArd	But I assume that it does not happen.
08:43	AWizzArd	So, the [,;] should split only when not inside a BEGIN END block.
08:43	AWizzArd	And the BEGINs and ENDs need to be eliminated from the result.
08:43	Chouser	I assume the \" are just for Clojure, not in the file itself?
08:44	jdz	i think i'd create a filter that would escape those separators inside begin/end
08:44	AWizzArd	Chouser: right
08:44	jdz	ard remove begin/end themselves
08:45	AWizzArd	jdz: yes, I am doing it in a similar way, in a function. But they are important markers, because the [,;] inbetween must not split.
08:45	jdz	actually, i think using regular expressions here is more trouble than they help
08:45	AWizzArd	I was just curious weather this can be expressed with a regex.
08:45	AWizzArd	jdz: yup
08:46	AWizzArd	I think noone here can solve that
08:46	jdz	i'm not gonna trip on that one
08:46	jdz	i have my own devices to tinker with :)
08:47	AWizzArd	Yes. I think most people will just give up on it after a few tries. It is really complex, and easily solved in an ordinary function.
08:48	AWizzArd	Fossi: the BDFL arrived (Keyword.java).
08:48	Fossi	AWizzArd: ah, excellent :) super assistent ;)
08:53	Fossi	rhickey: (Keyword.java:25) if i read the javadoc right, putIfAbsent returns the old key if it already exists, so the check in :26 is unnecessary
08:54	Fossi	rhickey: that being said we have a strange problem on the app engine where we time out in initializing. it happened to be twice in that line, so could it be some concurrency issue?
08:55	Chouser	AWizzArd: (map #(or (% 1) (% 2)) (re-seq #"(?s)(?:^\|[,;])(?:BEGINTEXT[,;](.*?)[,;]ENDTEXT\|(?!BEGINTEXT)([^,;]+))" x))
08:55	Fossi	("it" happened: the timeout)
08:55	Chouser	now, who couldn't love a solution like that? :-P
08:58	ole3	hello, how do i check if a process is still running? (.exitValue process) ?
08:58	Fossi	brb
09:03	jdz	ole3: solutions to Java related issues can also be tried in #java
09:03	jdz	(i hope)
09:03	ole3	jdz: good idea, thank you.
09:04	AWizzArd	Chouser: let me test, one sec
09:05	Chouser	AWizzArd: (re-seq #"(?s)(?<=BEGINTEXT[,;]).*?(?=[,;]ENDTEXT)\|(?<=^\|,\|;)(?!BEGINTEXT)[^,;]+" x)
09:05	Chouser	there, without the map.
09:05	bstephenson	hello, have a quick question for the clojure experts, if I could
09:06	bstephenson	I have a vector of hours (e.g. [0 1 2 0 4 3]) and a map of that holds the totals hours in each day used already (e.g., {:day1 0 :day2 2 :day3 3 :day4 7 :day5 6}. Is there a straightforward way (or any way, really) to add the vector values to the map values such that the nth vector value gets added to the value of "day-nth" in the map? The map and vector counts will always be the same.
09:07	jdz	bstephenson: hardcoding day names in your map keys seems to be a bad idea (to me)
09:08	bstephenson	how would you approach it?
09:08	AWizzArd	Chouser: looks good. You were the first who made that. I gave that puzzle to some friends so far and they gave up.
09:09	jdz	bstephenson: but anyway, you can have a separate map which will give you vector indices when given day names
09:09	jdz	bstephenson: well, why not use vectors of hours or maps in both cases?
09:10	bstephenson	well, I was using the map to use the assoc function to update the value, but I think now that you are probably correct, two vectors will work better than a vec and a map, they will always have the same index.
09:11	bstephenson	jdz: thx
09:28	rhickey	Fossi: how is the check unnecessary? If the key was there I need to return the old one, if not the new one. I can't just return the result of putIfAbsent as it will be null if it wasn't there
09:30	rhickey	Fossi: do you get a stack trace when you timeout?
10:08	liwp	Chouser: I think you need to add ENDTEXT to the negative lookahead as well
10:08	liwp	,(re-seq #"(?s)(?<=BEGINTEXT[,;]).*?(?=[,;]ENDTEXT)\|(?<=^\|,\|;)(?!BEGINTEXT\|ENDTEXT)[^,;]+" "BEGINTEXT;foo;ENDTEXT")
10:08	clojurebot	("foo")
10:09	liwp	Chouser: and thanks for all the effort you're putting into these regexp challenges, I'm learning a lot here
10:11	Chouser	,(re-seq #"(?s)(?<=BEGINTEXT[,;]).*?(?=[,;]ENDTEXT)\|(?=^\|,\|;)(?!BEGINTEXT)[^,;]+" "BEGINTEXT;foo;ENDTEXT")
10:11	clojurebot	("foo")
10:11	liwp	maybe I messed up my copy pasting...
10:11	Chouser	oh, no, I think I did.
10:11	liwp	,(re-seq #"(?s)(?<=BEGINTEXT[,;]).*?(?=[,;]ENDTEXT)\|(?<=^\|,\|;)(?!BEGINTEXT)[^,;]+" "BEGINTEXT;foo;ENDTEXT")
10:11	clojurebot	("foo" "ENDTEXT")
10:12	liwp	that's what I got earlier
10:12	AWizzArd	hmm
10:12	Chouser	the one I just pasted above is not right. please ignore it
10:13	AWizzArd	what is this (?s) thing with which it starts?
10:13	liwp	who knows ;-)
10:14	Chouser	liwp: yes, you're right. I had this in my command history, but somehow pasted the wrong one instead. I think this is right (and essentially the same as you have):
10:14	Chouser	(re-seq #"(?s)(?<=BEGINTEXT[,;]).*?(?=[,;]ENDTEXT)\|(?<=^\|,\|;)(?!BEGINTEXT)(?!ENDTEXT)[^,;]+" "BEGINTEXT;foo;ENDTEXT;bar")
10:14	Chouser	the (?s) at the beginning says that . should also match \n for the rest of the regex
10:15	liwp	The other question mark stuff is related to lookaround: http://www.regular-expressions.info/lookaround.html
10:16	liwp	for those of us who didn't know how it all worked
10:17	Chouser	and if you ever think regex can't do something or other, keep this in mind: http://blog.n01se.net/?p=12
10:18	liwp	urgh, some people have too much time on their hands
10:19	AWizzArd	There is this programming language Malbolge ( http://en.wikipedia.org/wiki/Malbolge ) in which only "Hello World" was the only program ever written. And this hello world program was not written by a human, but by a Lisp program :)
10:20	AWizzArd	If people really have a lot of time...
11:06	Fossi	rhickey: ah, ok, the documentation says it's equal to a if !contains, put else get, which would return the old one, so i didn't care to read the actual return documentation
11:06	Fossi	a little inconsisten there
11:08	Fossi	rhickey: is it ok if i pm you the stacktrace?
11:10	Fossi	(as a paste link of course)
11:18	lpetit_	hello
11:18	lpetit_	I can't seem to get rid of reflection warning here, missing something trivial I think :(let [to-name-fn #(-> #^File %
11:18	lpetit_	.getPath
11:18	lpetit_	(str2/drop (inc (-> builds-dir
11:18	lpetit_	.getPath
11:18	lpetit_	.length)))
11:18	lpetit_	(.replace "/" "."))]
11:19	lpetit_	The last call to .replace generates a "call to replace can't be resolved."
11:20	lpetit_	.replace works on a String, and takes CharSequences as arguments. How can I indicate the "mutation" of the threaded argument ?
11:27	jdz	lpetit_: i'd try macroexpanding that form and look what's there
11:30	lpetit_	,(macroexpand '#(-> #^File % .getPath (.replace "/" ".")))
11:30	clojurebot	(fn* [p1__2529] (-> p1__2529 .getPath (.replace "/" ".")))
11:31	jdz	seems to me that the type tag is lost
11:31	jdz	or maybe not
11:32	jdz	,(macroexpand '(-> p1__2529 .getPath (.replace "/" ".")))
11:32	clojurebot	(. (clojure.core/-> p1__2529 .getPath) replace "/" ".")
11:34	cark	str2/drop must be returning an Object
11:34	cark	so you could #^String (str2/drop ...
11:34	lpetit_	I'll try, thanks (was working on the wrong s-exp :-( )
11:36	lpetit_	weird, I tried it but still same warning
11:36	cark	mhh
11:37	cark	builds-dir is untyped too
11:38	lpetit_	Reflection warning, /home/lpetit/*******_tests.clj:28 - call to replace can't be resolved.
11:41	cark	and when you run it you have no errors ?
11:42	cark	could you paste your current code ?
11:42	lpetit_	currently trying to cut it down to the minimum
11:43	lpetit_	no error when running
11:43	Chouser	-> builds a new list for each step past the first
11:44	Chouser	,(binding [print-meta true] (prn (macroexpand '(-> a #^Integer (b)))))
11:44	clojurebot	(b a)
11:44	lpetit_	now that's interesting:
11:44	lpetit_	1:41 engine-tests=> #(.replace "/" ".")
11:44	lpetit_	Reflection warning, NO_SOURCE_PATH:41 - call to replace can't be resolved.
11:44	lpetit_	#<engine_tests$eval__250$fn__252 engine_tests$eval__250$fn__252@15d616e>
11:45	cark	mhh i know i resolved type warning within ->
11:45	lpetit_	I also remember this demonstrated on the ml
11:46	lpetit_	(note : working with clojure-1.0)
11:46	Chouser	-> could be patched to copy metadata from the given form to the produced one.
11:46	lpetit_	don't misinterpret : it's not working with clojure-1.0, I'm using clojure-1.0
11:47	lpetit_	,(binding [print-meta true] (prn (macroexpand '(-> a (#^Integer b)))))
11:47	clojurebot	(#^Integer b a)
11:48	lpetit_	beh
11:49	lpetit_	Maybe we're not focusing on the right problem, see:
11:49	lpetit_	1:43 engine-tests=> (fn [] (.replace "/" "."))
11:49	lpetit_	Reflection warning, NO_SOURCE_PATH:43 - call to replace can't be resolved.
11:49	lpetit_	#<engine_tests$eval__262$fn__264 engine_tests$eval__262$fn__264@c5aa00>
11:49	Chouser	.replace needs 3 args
11:50	Chouser	only 2 within ->
11:50	lpetit_	oh yes sorry
11:50	cark	chouser : indeed it's not working
11:50	lpetit_	so the goes back to the -> , of course
11:51	cark	anyways you could insert a str call juste before the (.replace
11:51	lpetit_	within -> it's normal the first is the threaded argument
11:52	lpetit_	so in my original example with ->, there are 3 arguments to .replace
11:53	Chouser	try (#^String str2/drop ...)
11:56	lpetit_	that's it !
11:58	lpetit_	I could also tackle it directly in clojure-contrib/str-utils2 : changing defs like (defn drop [#^String s n] into (defn #^String drop [#^String s n]
11:58	Chouser	str2 could use some hints splinkled around.
11:58	Chouser	yeah
11:58	lpetit_	post collision :)
11:58	lpetit_	ok I'll do it
11:59	lpetit_	around the beginning of next week, it 6pm here in France, by guys
11:59	lpetit_	and thx for all
12:00	hiredman	AWizzArd: pong
12:51	stuartsierra	commit 4b4f6ab5bcab58c4219eb50395bd366daea3ecc3: str_utils2.clj: added type hints for String return values; fixes #27
12:58	fsodomka	hi all!
12:58	fsodomka	couple days ago I saw discussion about new possible multimaps and their syntax... some time ago I played with Rebol, so I wanted to point out its syntax if anyone wants to get inspired...
12:58	fsodomka	Values: http://rebol.com/docs/core23/rebolcore-3.html#section-2
12:58	fsodomka	Evaluating Simple Values: http://rebol.com/docs/core23/rebolcore-4.html#section-4.2
12:58	fsodomka	and their use: Conditional Blocks: http://rebol.com/docs/core23/rebolcore-4.html#section-6.1
12:58	fsodomka	... not sure if that helps...
13:54	Chouser	rathore: nice job posting! Sounds interesting.
14:01	cark	a sample executable jar build process using ant : http://github.com/cark/clj-exe-jar/tree/master
14:02	cark	~executable jar?
14:02	clojurebot	Pardon?
14:03	cark	~executable jar is a sample executable jar build using ant : http://github.com/cark/clj-exe-jar/tree/master
14:04	cark	hum
14:04	hiredman	:(
14:04	ababo	Hi there, please help me to figure out why casting to an interface is not working!
14:04	cark	clojurebot: don't do thhis to me !
14:04	clojurebot	Pardon?
14:04	ababo	,(cast javax.script.Invocable (.getEngineByName (javax.script.ScriptEngineManager.) "js"))
14:04	clojurebot	nil
14:05	ababo	That returns ScriptEngineManager instead of Invocable
14:05	stuartsierra	Clojure is dynamic, no need to cast anything.
14:05	ababo	When I try to call a method of the interface it fails.
14:07	Chouser	,(doc cast)
14:07	clojurebot	"([c x]); Throws a ClassCastException if x is not a c, else returns x."
14:08	ababo	Aha, got it, thanks!
14:08	cark	is there some good soul that would provide me with the equivalent linux clojure startup script for the sample project i just linked ?
14:08	stuartsierra	ScriptEngine isn't required to implement the Invocable interface.
14:09	cark	equivalent to run-clojure.bat
14:09	stuartsierra	cark: there are sample launch scripts in contrib
14:10	Chouser	cark: line 2 looks like it would work as-is -- what does line 1 do?
14:10	cark	i'm at home and don't have a linux handy. I wouldn't want to screw an example
14:11	cark	chouser : line 1 changes current directory to the .bat file's directory
14:11	dmix	anyone recognize whats causing this error? http://gist.github.com/177119 I can't decipher it
14:13	cark	dmix : maybe show us the code that produces the error ?
14:16	hiredman	~executable jar is a sample executable jar build using ant : http://github.com/cark/clj-exe-jar/tree/master
14:16	clojurebot	Ok.
14:16	hiredman	~executable jar
14:16	clojurebot	executable jar is a sample executable jar build using ant : http://github.com/cark/clj-exe-jar/tree/master
14:16	cark	hiredman : thanks !
14:16	ababo	My bad, method name is .invokeFunction but the example code has .invoke
14:16	ababo	Thanks for the input!
14:20	Chouser	#!/bin/bash
14:20	Chouser	cd "$(dirname $0)"
14:20	Chouser	cark: Those two lines instead of your first should do it.
14:20	cark	chouser : ok and the filename should be run-clojure.sh ?
14:21	Chouser	you could leave of the .sh, but sure.
14:21	cark	i'm a linux ignoramus
14:21	cark	ok thanks
14:21	hiredman	:(
14:22	hiredman	#!/bin/sh
14:22	hiredman	#!/bin/bash is horrible
14:26	hoeck1	cark: and split paths on the java -cp line with a colon instead of a semicolon
14:26	Chouser	hiredman: oh? what OS do you use?
14:26	cark	ah yes indeed !
14:26	Chouser	hoeck1: oh, good catch -- I missed that.
14:26	Chouser	hiredman: $() is a bash thing anyway -- /bin/sh wants me to use backquotes or something.
14:27	hiredman	Chouser: $() is a sh thing
14:27	hiredman	I use an OS that does not come with bash, and addon software doesn't get installed in /
14:28	Chouser	hiredman: so... not linux. :-)
14:28	cark	i think any linux user picky enough to want one or the other should be able to make the change
14:29	hiredman	cark: #!/bin/sh
14:30	cark	haha looks like i have to make a vm to test this anyways =/
14:31	hiredman	two characters, and suddenly your shell script will run on any unix
14:39	rsynnott	and you'll want the permissions to be right
16:03	kotarak	Chouser: thanks for for!
16:21	hiredman	http://www.scala-lang.org/node/3069 "He found that it is, on average, 30% faster to comprehend algorithms that use for-comprehensions and maps, as in Scala, rather than those with the iterative while-loops of Java."
16:23	ankou	hi, I just read the chapter about lazy sequences in Programming Clojure and I am surprised that lazy sequences use normal recursion instead of tail-recursion but seam to work with large numbers as well? why? or is this a missunderstanding?
16:24	hiredman	ankou: sort of
16:24	hiredman	lazy-seqs sort of recur
16:25	hiredman	but the recursion and stack depth are controled by sequence consumption
16:25	kotarak	ankou: when the recursive call happens the original call, where the recursion was "started" already returned. So there is no build up of stack frames
16:25	hiredman	so if you consume the sequence, but throw away the parts you have already seen, you don't consume space
16:25	kotarak	you can still blow the stack by piling eg. map on map on map on map ...
16:27	kotarak	And - man - cl-format sure is on steroids...
16:34	Chouser	kotarak: I didn't write 'for', it's all I can do to understand it just enough to tweak a bit here and there.
16:34	Chouser	but you're welcome for the chunked version. It was hard!
16:38	Chouser	This has gotten a bit interesting recently: http://github.com/richhickey/clojure/graphs/impact
16:40	kotarak	github doesn't like me. :( The network graph for contrib seems frozen for days now. :(
16:41	kotarak	The small fixes could use some turbo. :\|
16:43	rhickey	Chouser: neat, I'd never seen that view
16:44	Chouser	rhickey: btw, the finger tree paper does define deque ops, tail-l and tail-r. I just missed them somehow.
16:45	rhickey	oh, good
16:46	Chouser	so split is only useful or needed for annotated (measure/reduce) tree.
16:46	rhickey	okasaki famously left out delete from his example red black tree
16:46	Chouser	heh
16:48	Chouser	someone asked me last night why you didn't do finger trees in the first place. I had some guesses, but didn't know.
16:48	Chouser	instead of vectors, I suppose.
16:48	rhickey	so I wonder - how important are the annotated versions?
16:48	rhickey	finger tress are unlikely to touch the perf of the vectors
16:50	Chouser	annotations can give you random-access, priority queues, ordered sequences...
16:51	Chouser	also I suspect some clever application-specific uses. For testing I'm using the str fn for both measure and reduce, so I always have a correctly-ordered string representation of the whole collection.
16:51	rhickey	neat
16:52	rhickey	reigy working ok for you?
16:52	rhickey	reify
16:52	Chouser	not there yet.
16:52	Chouser	probably start trying to use it this weekend.
16:53	Chouser	the transition from haskell-ish to clojure is big enough by itself. I wanted to get a taste of that before I tried to figure out the right way to use reify.
16:54	rhickey	makes sense
16:54	Chouser	do you have a gut feeling about whether a node of 2 to 4 items should be an array of 4, an array of needed size, or 4 separate fields?
16:55	Chouser	oops, gotta go. I'll read the history later...
16:56	rhickey	Chouser: do the node of different N have different behavior? If you look at the different Clojure data structures you'll see a lot of Node polymorphism
17:03	lpetit	stuartsierra: hi, I saw you were quicker than me to add missing type hints on c.c.str-utils2 :)
17:03	lpetit	would you mind applying them on the compat branch, also ? (I didn't check, maybe already done ?)
17:13	stuartsierra	lpetit: ok
17:17	stuartsierra	ok, done
17:18	Chouser	rhickey: ah, I hadn't thought of that. I'll have to look again to see how transients are done now.
17:18	lpetit	stuartsierra: thanks a lot!
17:19	rhickey	Chouser: not just for transients, see e.g. PersistentTreeMap
17:20	rhickey	Okasaki's pattern matches turned into polymorphic dispatch
17:23	lpetit	stuartsierra: did not see the commit yet
17:24	lpetit	stuartsierra: did you make "clojure-contrib behaviour breaking changes" on the clojure-1.0-compatible branch ? (templating system, etc.)
17:27	lpetit	stuartsierra: I thought clojure-compatible was not only compatible with also clojure-1.0, but also just a maintenance branch of clojure-contrib, so that people know they have a "1.0 with no breaking changes clojure/clojure-contrib" duo ?
17:29	lpetit	stuartsierra: note that importing new functionality does no harm, but sometimes it has side effects as importing newer (incompatible ?) versions of some other dependencies ...
17:31	stuartsierra	Wait, did I just break the git repo?
17:32	stuartsierra	lpetit: no, I did not (intentionally) make any behavior-breaking changes
17:33	lpetit	stuartsierra: ok, glad to have been able to catch it, then.
17:36	lpetit	stuartsierra: woops, you pushed 110 commits from master to compat branch
17:36	stuartsierra	Damn.
17:36	stuartsierra	How the heck did that happen?
17:37	lpetit	stuartsierra: you did some sort of merge instead of a cherry pick
17:37	lpetit	stuartsierra: probably
17:37	stuartsierra	Great. Now I have to figure out how to fix that.
17:38	lpetit	stuartsierra: let's think about it together
17:38	stuartsierra	Anybody know how to fix this
17:40	lpetit	ok I'm pretty sure you did a merge (not a rebase) from what I can see from gitk
17:40	lpetit	so it will be very easy to do the reverse change
17:40	stuartsierra	ok, just cloned a new copy of clojure-contrib
17:42	lpetit	it's just a matter of making the compat label point to the rev with comment "repl-utils: Fix init state for...", that is rev e0080e640a2d9b79
17:42	lpetit	now we must find the appropriate command :)
17:44	stuartsierra	yeah
17:45	lpetit	the simpler could be to do a git reset ...(options to determine) and if you have commit rights, to push it. It will definitely delete the wrong commit.
17:45	stuartsierra	I think it was an older commit, though.
17:45	lpetit	If nobody tried to checkout or fetch compat in the time interval, nobody will be harmed
17:46	stuartsierra	let's go with that assumption
17:47	lpetit	ok, so enter git reset --hard e0080e640a2d9b79 in your clone
17:47	stuartsierra	They seem to diverge on "build.xml: run compile-clojure in headless..." 3073f0dc0614cb8c95f2debd0b7e6a75c1736ece
17:51	stuartsierra	ok, did: git checkout origin/clojure-1.0-compatible
17:51	lpetit	no, chouser ported a correction in commit e0080e640a2d9b79
17:52	lpetit	no, don't do that !
17:52	stuartsierra	ok, clearly I don't understand git as well as I thought I did
17:53	lpetit	I'm not 100% sure, but pretty sure it's a bad thing : it is intended as being a mirror of what is on the remote
17:53	lpetit	I also have git repos for Counterclockwise, and work only on private trees that I push from time to time
17:54	lpetit	on your fresh clone, switch to your local branch for compat, maybe you have named it compat, maybe something else, so type git branch to see all your branches, and once you've localised it, git checkout <theRightName>
17:55	lpetit	then issue the command I stated previously : git reset --hard e0080e640a2d9b79
17:55	lpetit	then try to push. If this does not work, there are some things in the configuration I don't master yet.
17:56	lpetit	you'll finish in the spam black list of everybody :-p
17:57	drewr	are you guys trying to push to the public repo after a local git reset --hard?
17:57	lpetit	:-$
17:58	lpetit	oups, caught
17:58	stuartsierra	We're trying to erase a bunch of commits that I accidentally merged into the clojure-1.0-compatible branch.
17:58	drewr	you would have gotten away with it if it weren't for a couple of commits that just came in from others :-/
17:58	stuartsierra	damn
17:58	stuartsierra	now what?
17:59	lpetit	drewr: no the problem is on the compat branch of clojure-contrib
17:59	drewr	git rebase origin/master :-)
17:59	stuartsierra	No, master is fine. It's only the clojure-1.0-compatible branch that I messed up.
17:59	drewr	at this point it's probably best to just leave it alone
18:00	lpetit	compat branch has just the last merge commit wrong.
18:00	drewr	the history will be a little dirty, but that's ok
18:00	lpetit	Seriously, for the compat branch, no big deal to quickly correct this ?
18:00	stuartsierra	Assuming we can figure out how.
18:01	lpetit	(is it me that is saying that)
18:01	lpetit	stuart, did you try my "instructions" ?
18:01	drewr	maybe the couple of msgs I saw were from you guys
18:01	stuartsierra	lpetit: not yet, hang on
18:02	drewr	as long as no one else has committed, you can "git reset --hard COMMIT_YOU_WANT && git push -f origin/clojure-1.0-compatible"
18:02	lpetit	I'll reproduce it locally too.
18:02	stuartsierra	Ok, starting fresh.
18:03	stuartsierra	git clone git@github.com:richhickey/clojure-contrib.git
18:03	stuartsierra	cd clojure-contrib
18:03	lpetit	git branch -r ; copy the name origin/clojure...compatible ...
18:04	stuartsierra	git checkout -b compat origin/clojure-1.0-compatible
18:04	lpetit	git checkout -b compat origin/clojure... ; compat will be the name of your branch
18:04	lpetit	ok
18:05	stuartsierra	git reset --hard e0080e640a2d9b79
18:05	lpetit	now, the hard reset git reset --hard e0080e640a2d9b79
18:05	lpetit	ok !
18:05	lpetit	and the command from drew (thanks!)
18:05	stuartsierra	Now what do I push to?
18:05	stuartsierra	"git push origin/clojure-1.0-compatible" ?
18:06	stuartsierra	Or just "git push"?
18:06	lpetit	let's try that
18:06	lpetit	the fully specified first
18:06	drewr	you'll likely have to push -f
18:07	drewr	because the histories don't agree
18:07	stuartsierra	"error: src refspec clojure-1.0-compatible does not match any."
18:07	lpetit	true
18:08	lpetit	would -f help ?
18:08	drewr	not for that error
18:08	stuartsierra	same error
18:08	drewr	let me update and look aroudn
18:08	lpetit	based on the criteria of "shooting yourself on the feet", I would say git is way powerful than clojure :)
18:09	lpetit	stuart : and just git push -f
18:09	lpetit	if you still are in the compat branch, of course
18:09	drewr	stuartsierra: remove the slash
18:09	drewr	it should be "origin cloj..."
18:09	stuartsierra	did that
18:10	stuartsierra	lispaste: url
18:10	stuartsierra	lisppaste: url
18:10	lisppaste8	To use the lisppaste bot, visit http://paste.lisp.org/new/clojure and enter your paste.
18:10	drewr	you could do "git push origin :clojure-1.0-compatible && git push origin clojure-1.0-compatible"
18:11	drewr	that'll delete the branch and recreate it
18:11	lpetit	seems dangerous
18:11	stuartsierra	But git seems to be telling me that the branch doesn't exist in the first place
18:11	lisppaste8	stuartsierra pasted "Trying to push to github" at http://paste.lisp.org/display/86203
18:11	drewr	stuartsierra: what does "git branch -a" tell you?
18:12	lisppaste8	stuartsierra annotated #86203 "git branch -a" at http://paste.lisp.org/display/86203#1
18:12	lpetit	it may be because there are some implicit conventions, and since you did not give the same name to your local branch and the remote one, some more typing may be involved
18:12	drewr	ahh
18:12	stuartsierra	ah, pes
18:12	stuartsierra	yes
18:12	Chousuke	you should not use -f to push
18:12	drewr	so you would do...
18:13	drewr	since your local branch is a different name
18:13	stuartsierra	stuart@wsgrhl700c3:/tmp/clojure-contrib$ git push -f origin compat:clojure-1.0-compatible
18:13	stuartsierra	Total 0 (delta 0), reused 0 (delta 0)
18:13	stuartsierra	To git@github.com:richhickey/clojure-contrib.git
18:13	stuartsierra	+ 69f810b...e0080e6 compat -> clojure-1.0-compatible (forced update)
18:13	Chousuke	if you use -f and push a branch that is not a descendant of the branch you're pushing to, you'll screw up other people's repos
18:14	drewr	Chousuke: that's what they're trying to do
18:14	stuartsierra	Chousuke: I know, normally I would not push -f, but in this case I already screwed up the repo and I'm trying to fix it.
18:14	Chousuke	ah, okay :)
18:14	drewr	stuartsierra: ok, so you got it?
18:14	stuartsierra	I think that did it. Look at http://github.com/richhickey/clojure-contrib/commits/clojure-1.0-compatible
18:15	lpetit	better, I'll do a fetch and see locally :)
18:15	drewr	looks good here
18:16	lpetit	yeah
18:16	lpetit	fiouu
18:16	stuartsierra	ok, phew
18:16	drewr	git log -1 --pretty=oneline
18:16	drewr	e0080e640a2d9b79564a3fb6eb7ee36be1882901 repl-utils: Fix init state for add-break-thread!
18:16	lpetit	oh sorry phew is fiouu in french :)
18:16	lpetit	yes that's what we wanted
18:16	stuartsierra	fiouu is a better spelling, anyway :)
18:17	lpetit	so now, stuart, please man git-checkout :-)
18:17	lpetit	no, man git-cherry-pick
18:17	lpetit	:à
18:17	lpetit	;-)
18:17	stuartsierra	yeah, I still don't understand it. I did cherry-pick then push, what could be simpler?
18:18	lpetit	oh
18:18	stuartsierra	Wait, I know.
18:18	stuartsierra	I did "git checkout -b compat" without specifying which branch to track, so I got the master branch.
18:18	stuartsierra	Then pushed it back.
18:19	lpetit	yes, but how come it was then checked in the compat branch ?
18:19	lpetit	do you stil have the history of the commands?
18:19	Chousuke	hmm, yeah, master is still a descendant of the compat branch, is it?
18:20	lpetit	no, Chouser commited something on July
18:20	lpetit	stuart, it work, the reverse spamming has begun :)
18:20	lpetit	it works
18:21	stuartsierra	yay
18:22	lpetit	so now, let's try the cherrypick ? :-) git checkout compat && git cherry-pick -x 4b4f6ab5bcab58c4219e
18:23	stuartsierra	no, I'm going home. I'll try the cherry-pick when I'm more awake
18:23	lpetit	if it's possible to do this as a patch I can do it and then attach it to the issue
18:23	lpetit	at your convenience
18:24	Chousuke	well you can always do the cherrypick yourself and then use git format-patch
18:24	Chousuke	the end result will be the same.
18:24	stuartsierra	That won't help, will it? I (or someone) still have to push to the right branch.
18:24	stuartsierra	I just have to get good with git.
18:25	lpetit	ok, so we'll let this as an exercise for the reader :)
18:25	stuartsierra	yeah, g'night folks
18:25	Licenser	I think it is great to have those videos
18:25	lpetit	g'night
18:26	Licenser	night lpetit
18:31	drewr	whenever I'm about to venture into uncharted territory with git I always create a test repository, clone it, try whatever on the clone, and then push
18:32	drewr	you can do that in /tmp in 5 min
18:32	drewr	and they're both gone
18:32	drewr	(lpetit and stuartsierra that is)
19:53	JAS415	is there a way to match and replace a string without java doing the regex machinations?
19:58	Chouser	what's wrong with Java doing it? I like contrib str-utils2/replace
20:01	dmiles_afk	are some you guy s masters at understanding verify errors?
20:01	dmiles_afk	javaclassloader verify errors that is
20:02	dmiles_afk	does clojure use invokeinterface ? or just invokevirtuals?
20:03	dmiles_afk	(thats eigther only invokevirtuals vs both)
20:10	dmiles_afk	ah it uses a private copy of ASM whichmakes it more transparent
21:39	lowlycoder	is there a macro for scheme-like define in clojure? one that acts more like letfn than defn? (i.e. define the function in the local lexical environment~ not the global one)
21:42	cemerick	lowlycoder: I think so. I remember someone asking something very similar, and there was either something in place, or perhaps in contrib?
21:43	lowlycoder	not finding it grepping for "define " in clojure-contrib
21:43	JAS415	hmm
21:43	JAS415	how do i replace a $ with an escaped $ in a string?
21:43	lowlycoder	then again~ i'm running clojure 1.0.0 with the relevant clojure-contrib
21:43	JAS415	with a regex
21:44	JAS415	you could just use letfn all over
21:44	lowlycoder	no; i have the indenting
21:44	lowlycoder	s/have/hate
21:45	JAS415	oh, indenting
21:45	JAS415	you could make a macro
21:46	tomoj	lowlycoder: didn't we already talk about this?
21:46	lowlycoder	yes; we concluded that clojure and scheme are different
21:47	tomoj	also that a macro for the inner defines alone wouldn't help
21:47	tomoj	you'd need to use a macro for the toplevel form
21:47	lowlycoder	of course not
21:47	lowlycoder	right
21:47	lowlycoder	this looks like a messy job
21:47	lowlycoder	and also screws up debugging support
21:47	lowlycoder	(like mismatching of source code lines)
21:48	lowlycoder	so i'm hoping someone else has handled this already
21:48	tomoj	macros mismatch source code lines?
21:48	cark	lowlycoder : are you looking for letfn ?
21:49	lowlycoder	no~ i'm looking for a macro that ends up writing letfn
21:49	JAS415	um
21:49	lowlycoder	s/writing/calling
21:49	cark	what's the local envioronment you're talking about ?
21:50	JAS415	i forget how define in scheme works
21:50	tomoj	I think you would need to macroexpand all the forms in the body, take the initial segment that start with def, and then turn those into a letfn that you wrap around the rest of the body
21:50	tomoj	or if you use "define" in the inner defines as well, it would be even easier
21:50	JAS415	upi cam
21:50	cark	oh i see now
21:50	JAS415	you can't just use let
21:50	lowlycoder	cark: it's hard to explain unless you use scheme; it's obvious if you do
21:50	JAS415	?
21:51	cark	i got it now
21:51	JAS415	let = define..
21:51	JAS415	we're talking about lexical scope?
21:51	lowlycoder	yes
21:51	cark	i don't think you can access the environement from a macro in clojure
21:52	tomoj	sure you can
21:52	tomoj	just have the macro produce a letfn
21:52	cark	right but he wants to have the "define" valid after it is err ... defined
21:53	tomoj	that's why you need a macro
21:53	lowlycoder	cark: there we go :-)
21:53	tomoj	it needs to convert those into a proper letfn
21:53	JAS415	have the define valid after is define
21:53	cark	but how would your macro know what are the next forms
21:53	JAS415	hum
21:53	tomoj	it's just the rest of the body
21:54	tomoj	all the forms in the body besides the initial segment which start with "define"
21:54	JAS415	hmm
21:54	JAS415	well idunno
21:54	JAS415	it sounds like a lot of work to reimplement scheme :-P
21:54	cark	that's what he wants (def bleh [] (define somefunc (fn [] (println "hello")) (somefunc))
21:55	tomoj	cark: no, the new macro goes at the top level
21:55	tomoj	(define bleh [] (define somefunc (fn [] ...)) (somefunc))
21:56	tomoj	in that case the toplevel define can take the initial segment of forms starting with "define" it its body and convert them into a letfn, then wrap that around the rest of the body
21:56	cark	ah in this case the define macro could walk the code and do it, yes
21:56	tomoj	you're right, seems impossible to add inner defines to defn
21:57	cark	but i don't like it, because the semantic of the outer define is not the same as the inside one
21:57	tomoj	well you could name it whatever
21:57	cark	mhh no scratch that
21:58	cark	it would be ok as the outer lexical scope is the namespace
21:58	tomoj	to really get this working like scheme you would have to define new versions of fn, let, letfn, defn
21:58	lowlycoder	where is richhickey?
21:58	tomoj	since inner defines can be used in all the scheme equivalents
21:58	lowlycoder	i want to hear his reasons for changing this
21:59	tomoj	changing it?
21:59	cark	well i want to hear your reasons to have it your way =P
21:59	tomoj	did clojure support inner defines at one time?
21:59	lowlycoder	yeah~ for making the semantics of defn clojure != scheme define
21:59	tomoj	clojure did not derive from scheme...
21:59	lowlycoder	all languages derive from scheme
21:59	tomoj	hah
21:59	JAS415	no
21:59	cark	hehe
22:00	JAS415	all languagse derive from fortran
22:00	JAS415	:-(
22:00	JAS415	fortran and algol
22:00	lowlycoder	all langauges derive from waving a magnet over a harddrive
22:00	JAS415	:-( :-(
22:00	tomoj	I mean it's not like he took scheme and then said for each feature, "hmm.. should we keep this feature or change it?"
22:01	JAS415	how do i replace a $ in a string with an escaped $?
22:01	JAS415	i've got this far
22:01	JAS415	(.replaceAll "$324" "\\$" "\$")
22:02	JAS415	(.replaceAll "$324" "\\$" "\\$")
22:03	JAS415	this far
22:03	Chouser	,(.replaceAll "$324" "\\$" "\\$")
22:03	hiredman	oops
22:03	JAS415	it returns $324
22:03	tomoj	,(.replace "$324" "$" "\\$")
22:03	clojurebot	"\\$324"
22:03	JAS415	but i'm guessing i want \$324
22:03	JAS415	so i try to escape it
22:04	hiredman	you have to \\\\
22:04	hiredman	,(.replace "$324" "\\$" "\\$")
22:04	clojurebot	"$324"
22:04	hiredman	,(.replace "$324" "\\\\$" "\\$")
22:04	clojurebot	"$324"
22:04	hiredman	,(.replace "$324" "\\\\$" "\\\\$")
22:04	clojurebot	"$324"
22:04	JAS415	,(.replaceAll "$324" "\\$" "\\\\$")
22:04	clojurebot	java.lang.StringIndexOutOfBoundsException: String index out of range: 3
22:04	JAS415	oh i need 5
22:04	JAS415	okay
22:04	JAS415	i was trying 4
22:04	tomoj	I must not understand what you're trying to do..
22:05	tomoj	you want to replace "$" in a string with "\\$" ?
22:05	JAS415	well i got this string, which i'm going to use in a regular expression...
22:05	JAS415	which i pulled from an 'unknown source'
22:05	JAS415	so the internets
22:06	JAS415	and it comes back something like "Blahblah $60,000"
22:06	hiredman	,(.replace "$324" "$" "\\$")
22:06	clojurebot	"\\$324"
22:06	hiredman	like that?
22:06	JAS415	wow
22:06	JAS415	exactly like that
22:06	JAS415	there's a plain old replace?
22:06	JAS415	nice
22:06	tomoj	das hab ich auch gesagt..
22:06	Chouser	oh, use \Q
22:06	Chouser	,(re-seq #"\Q$1" "$1")
22:06	clojurebot	("$1")
22:09	wtetzner_	is there a function to check if a value is contained in a sequence?
22:09	wtetzner_	i know there is contains?, but that checks if a key exists in something associative
22:09	JAS415	nice (.replace works perfectly
22:09	Chouser	if you can use a set instead of a sequence, your life will be easier
22:09	JAS415	i'll have to look up \Q
22:10	wtetzner_	oh, that should be ok
22:10	wtetzner_	thanks
22:10	hiredman	calling .contains is much faster than creating a set and testing for set membership
22:11	hiredman	fyi
22:11	cemerick	so, I've got this lib whose most significant hotspot is isa? and friends
22:12	cemerick	I did a bunch of profiling, and supers (and to a much lesser extent, bases) is the fundamental culprit
22:12	wtetzner_	oh, thanks hiredman
22:12	wtetzner_	so is .contains part of the collection interface, but doesn't have a corresponding clojure function?
22:12	cemerick	I memoized supers, and got a very large factor speed improvement -- perhaps up to an order of magnitude, but I haven't taken a precise measurement
22:13	cemerick	(memoizing bases helped a little more, but was far less impactful)
22:13	cemerick	Does it seem like memoizing supers (+ bases, perhaps) is a good idea in general?
22:14	cemerick	I'm thinking that using a WeakHashMap would be more correct, so as to allow dead classes to go away, etc.
22:14	hiredman	cemerick: if your hierarchs are not java classes, it seems like they can be mutated
22:14	cemerick	hiredman: bases and supers are only concerned with classes and interfaces
22:14	hiredman	oh
22:14	hiredman	of course
22:15	cemerick	so, I'm thinking that this might be a safe optimization to apply, but I'm unsure of any impact on touchy module systems
22:15	cemerick	...and any other things I'm not thinking of.
22:15	cemerick	One way or the other, the perf improvement is very significant.
22:16	cemerick	anyway, I'm going to write some results up for a msg to the group, but I wanted to see if anyone had any immediate reasons why this would be a bad idea
22:17	hiredman	I wonder how good Class's .hashCode is
22:18	cemerick	hiredman: it doesn't override it
22:19	cemerick	which I think is good in this case
22:19	cemerick	e.g. if a new version of a class with the same name as another comes into supers/bases, it'll get its bases/supers recalculated
22:19	cemerick	that might actually be what saves me with the module systems
22:19	cark	the usage of isa? that needs to be optimzed, is it in a loop under your control ?
22:20	cemerick	cark: yes, but the size of the dataset isn't
22:21	cark	you could (binding [super (memoize super)] ...] ...) around your loops maybe ?
22:21	cark	or whatever function
22:21	cemerick	heh, that's sneaky :-)
22:21	cemerick	but, if this is safe, I'd like to see it made available to everyone's code
22:22	cark	mhh i don't think it is safe, i wouldn't want that a default in clojure
22:22	cark	some classes might be unloaded
22:23	cemerick	cark: that's why a weakhashmap would be more appropriate
22:23	Chouser	classes don't go away unless they're loaded by a classloader that goes away
22:23	cark	right
22:24	cark	this is a pretty obvious optimization, don't you think the java people would have done that already if it was a good idea ?
22:24	cemerick	cark: the point is, using a weakhashmap would allow those unloaded classes to get collected as they would be otherwise
22:25	Chouser	the supers of a class can't change, can they?
22:25	cemerick	nope. (JDK 7 majick aside)
22:25	Chouser	until we get interface injection, or whatever it's called.
22:25	cemerick	right
22:26	cark	hum if there's one exception, that's it, you can't do it anymore
22:26	cemerick	OK, quick numbers. Before memoization, 17165ms. After memoizing, 2749ms
22:26	cemerick	me likey :-)
22:28	cemerick	cark: exception? Like java.lang.Exception?
22:28	cark	nope i mean like "an exception to the rule that you can do it"
22:28	cark	like say jdk 7 =)
22:29	cemerick	oh, sure. If it's not safe, then that's it.
22:29	Chouser	well, you just need to know when to invalidate your cache
22:29	cemerick	jdk 7 is an externality until it actually exists in a meaningful way :-)
22:30	cemerick	Chouser: yeah, I'd assume interface injection would come with some kind of notification mechanism we could hook into
22:31	Chouser	actually didn't they say you had to do the injection before doing anything else with the class?
22:31	cemerick	I don't know...
22:31	cemerick	doesn't that defeat the point?
22:32	cark	are they trying to do something like c# extention methods ?
22:34	Chouser	ok, I remembered that wrong. Here's what I was thinking of: "For any given class and injectable interface, the injector method is called the first time the question arises whether the class implements the interface. (This could be an invokeinterface, an instanceof, or a reflective operation.) Just before the decision, the class is called an injection candidate."
22:34	cemerick	ah
22:34	cemerick	after injection, does a new class get consed up and swapped in for the old?
22:41	hiredman	I hope not