#clojure – 2015-10-10

2015-10-10

01:14	nowprovision	https://clojuredocs.org/clojure.core/lazy-seq#example-542692d3c026201cdc326ff1 why does this stackoverflow?
02:59	sveri	Hi, how can I define a prismatic schema for a "def"?
03:16	Trioxin	is opengl ez to use these days in clojure?
03:16	Trioxin	better yet maybe openCL
03:16	Trioxin	http://clojurecl.uncomplicate.org/
03:17	Trioxin	foking CUDA
04:32	cenzhe	hi, all
04:32	cenzhe	when I read the source file of core.clj
04:32	cenzhe	trying to find out how `case` is implemented
04:32	cenzhe	it further directs me to `case*`
04:33	cenzhe	but I can't find the declaration of `case*` anywhere
04:33	cenzhe	so, where is `case*` declared, and how it is loaded?
05:10	amalloy	it's a special form
05:21	cenzhe	@amalloy I see. But where is it defined?
05:21	amalloy	in the compiler, in java. that's basically what special form means
05:22	cenzhe	https://github.com/clojure/clojure/tree/master/src/jvm/clojure
05:22	cenzhe	somewhere here?
05:23	amalloy	specifically https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java
05:24	amalloy	more specifically still, https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java#L8441
05:26	cenzhe	cool!
05:26	cenzhe	many thanks
05:50	Seylerius	(inc wasamasa)
05:50	Seylerius	,(inc wasamasa)
05:50	clojurebot	#error {\n :cause "Unable to resolve symbol: wasamasa in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: wasamasa in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: wasamas...
05:50	Seylerius	(inc wasamasa)
07:36	boxed	is there some tool that makes developing macros somewhat non-horrible?
08:01	justin_smith	boxed: the thing that's helped me the most is never have logic in macros - macros are for syntax, if you need logic, write a function that does it and have the macro call that function
08:01	boxed	if only I had gotten that far :P
08:02	boxed	actually, now I managed to figure out how to use macroexpand-1 and that helped enough to get that far I think
08:03	justin_smith	oh yeah, macroexpand is another crucial thing of course
08:48	muhuk	say you have a get-in, it's not-found is another get-in. How do you refactor this?
11:01	sveri	Hi, how can I define a prismatic schema for "def"?
11:16	NickSeagull	Hi there, my first time here :)
11:17	emdashcomma	Hi
11:17	skeuomorf	Why does (hash) return a signed 32-bit int and not bytes?
11:17	skeuomorf	very weird
11:18	Empperi	due to java
11:18	NickSeagull	I suppose that too
11:19	Empperi	it returns hashcode not hash as in eg. md5 or similar
11:20	skeuomorf	Empperi: hashcode is a hash like md5 or similar
11:20	skeuomorf	Empperi: It's just that the representation here is stupid
11:20	Empperi	oh no, not in java
11:20	skeuomorf	Empperi: What do you mean? What's the underlying algorithm?
11:20	Empperi	in java it returns object hash code
11:20	Empperi	you define it per class yourself
11:20	Empperi	in java
11:21	Empperi	or it returns object memory address
11:21	skeuomorf	Empperi: Yes, well aware, how is the hashcode generated?
11:21	Empperi	if it's the default implementation
11:21	skeuomorf	Empperi: ah
11:22	NickSeagull	Btw guys, what do you think about core.typed? Do you think it is worth to use?
11:22	NickSeagull	I have read a few about the topic and I think its quite useful/interesting
11:22	NickSeagull	a few posts*
11:23	muhuk	How can I tell a (ring) request from response?
11:27	Empperi	ehm, request goes as function parameters, response comes as return value?
11:31	Empperi	no need
11:31	Empperi	it's just the older java which is funky
11:31	ARM9	wasn't core.typed incredibly slow?
11:31	Empperi	anyway, hashCode in java does not have anything to do with hashing algorithms but with hash trees
11:32	Empperi	it's a convoluted way to force it on every object but it allows them to be placed in hash trees and similar data strucutres
11:32	Empperi	hashCode is one of the worst things in old java
11:33	muhuk	Empperi: and nobody ever works on middlewares, right?
11:33	Empperi	and it gets worse with .equals() ...
11:34	Empperi	muhuk: oh no, I work with them all the time
11:34	Empperi	or well, not ALL the time :)
11:34	Empperi	but in pretty much every project
11:35	Empperi	but yeah, in middlewares you get request as a parameter and you're supposed to return the response which you get from the function you call in your middleware chain
11:35	Empperi	there's nothing special in it and it's really simple since everything is just normal functions
11:36	Empperi	there is no need to try to find out if you have a request or response in hand since you already know
11:36	skeuomorf	Empperi: Old java, new java, no matter what java, it's verbose java
11:36	skeuomorf	Empperi: :)
11:36	Empperi	nah, it's not that bad in java 8 :)
11:36	Empperi	sure it's verbose especially when compared to clojure
11:36	Empperi	but the enterprisey java and the "de facto way" to write java is pretty horrible
11:37	Empperi	the worst java I see is written by old C guys
11:37	Empperi	that stuff is terrible
11:37	skeuomorf	All Java is worst Java
11:37	Empperi	methods which might be 1-2kloc and classes which can be 5k+
11:38	Empperi	well we can happily disagree and continue with our lives ;)
11:38	skeuomorf	I only write Java when I absolutely have to e.g. Android, Clojure interop
11:39	Empperi	I just decided to write this one app in our system in java instead of clojure
11:39	Empperi	it was more simple to write in java in that particular case
11:40	Empperi	now we have 8 different apps/services, 7 in clojure one in java
11:40	skeuomorf	Well, the current lib I am writing would definitely be much easier in any mutable language
11:40	Empperi	(I think it was 8, currently in a paternity leave and been out from work for over 2 weeks)
11:40	skeuomorf	Some implementations just don't lend themselves well to immutability
11:41	Empperi	yeah
11:41	skeuomorf	Empperi: Congrats on the baby :)
11:41	Empperi	in our case it was the existing framework we had to use (or well, not had to use but it made sense since it had so much ready for us) and it would have been too cumbersome to do with clojure and it's java interop
11:41	Empperi	and thanks, she's now 1 year old
11:42	Empperi	staying home for the rest of the year
11:42	Empperi	my wife went back to work
11:42	skeuomorf	Babies are awesome
11:42	Empperi	usually lol
11:42	Empperi	not always
11:42	skeuomorf	Until they aren't :P
11:43	janus_	Hey, have anyone else encountered this problem? http://lpaste.net/142701
11:43	janus_	lein midje works normally
11:44	Empperi	janus_: looks like nrepl cannot connect
11:44	janus_	I'm using arch linux and leiningen2-git aur package
11:44	Empperi	might be a super tight firewall
11:44	janus_	Empperi: yeah, I've noticed that, but how to fix it?
11:45	Empperi	it's a network problem that's all I can say
11:45	Empperi	anyway gtg, that baby I mentioned :)
11:46	janus_	Empperi: o-kay, thanks anyway
12:58	NickSeagull	So, is core.typed recommended or not? lol
13:22	sveri	NickSeagull ARM9 cannot say anything about the speed. I tried it a few times, but did not manage to type everything. Cannot exactly say which forms, but it's kind of hard. On the other hand, I found some errors in my code with it. There was a post about some "bigger" company switching to prismatic.schema. It described the same pain points I had, except of the speed. But they had 90 namespaces covered, so this will surely take a w
14:26	krzysztof	hey, I have java class comming from external lib and I'd like to be able to have this class to be destrctured. It contains get(int i) method, but is not implementing any standard interface. do you know how can approach this?
14:27	justin_smith	(.get O 0) (or whatever number)
14:32	rhg135	I don't think you can directly
14:32	justin_smith	oh, if you literally mean destructuring yeah, no, you're out of luck
14:42	jeremyheiler	rhg135: you can try to fake it by writing a function that acts as a lazy seq over the obj
14:43	jeremyheiler	https://gist.github.com/jeremyheiler/86dffef5b0fbe6a7eed3
14:43	justin_smith	oh, good point, yeah
14:43	rhg135	I know hence the "directly" :P
14:44	jeremyheiler	gotcha
14:46	jeremyheiler	oops, you weren't asking the question
14:46	jeremyheiler	lol
14:46	rhg135	a better approach would be to lazily produce only the results you want
14:46	rhg135	no worrie.rs
14:47	rhg135	meh, I'm learning dvorak so typos ahoy
14:48	sveri	rhg135 You might want to have a look at neo. I also learned dvorak, but found neo to be better suited for the parantheses stuff
14:48	sveri	And switched to neo some time ago
14:48	jeremyheiler	rhg135: my obj-seq does dot hat
14:48	jeremyheiler	do that*
14:48	rhg135	sveri: will do
14:49	rhg135	but I also write
14:50	rhg135	jeremyheiler: if you request, say, 1, wouldn't it pull 0 too?
14:52	jeremyheiler	there's no 0 in the example input
14:52	jeremyheiler	which is [1 2 3]
14:53	rhg135	I mean index
14:54	jeremyheiler	rhg135: ok
14:54	jeremyheiler	i updated my gist with an example
14:57	rhg135	I see maybe. I need to go eat, I'm seeing hazy.
14:57	rhg135	bbiab
15:01	rhg135	Index 0 would be the 1,but I mean you can't assume .get() will be fast and idempotent
15:05	rhg135	For all you know .get(0) will try to contact a remote server, when all you need is .get(1)
15:11	phil_v	Hey all. Has anyone played around with the latest version of clojurefx? I can't figure out how to actually get anything to display.
15:17	rhg135	I need to check that out
15:18	rhg135	FRP will soon rule the programmer world
15:18	phil_v	:)
15:23	jeremyheiler	rhg135: sure... but just like you can't assume that, you cannot assume it isn't, either
15:24	rhg135	Better safe than sorry :-P but in that case you'd be explicit so nbd
15:26	jeremyheiler	rhg135:
15:26	jeremyheiler	oops
15:26	jeremyheiler	your point is valid, if you knew the operations were safe and idempotent, then go for it
15:27	jeremyheiler	but we don't know :-)
15:27	jeremyheiler	because the person who asked the question didn't specify
15:27	rhg135	I just never trust 3rd party java code
15:28	jeremyheiler	it could be legacy 1st party code
15:29	jeremyheiler	or it could be java sdk code that states that it's idempontent
15:29	jeremyheiler	https://github.com/jeremyheiler/xenopath/blob/master/src/xenopath/dom.clj#L24
15:44	rhg135	I guess I just assumed
15:52	muhuk	why is ring.util.request/body-string defined over ISeq & File while the spec says request body is an InputStream?
15:54	justin_smith	muhuk: I'd guess for mocking
15:54	justin_smith	I mean, it's also defined for InputStream, as one would expect
16:20	muhuk	Aleph aware Transit middleware: https://github.com/muhuk/ring-transit-middleware
16:40	abhir00p	Hi what would be some good libraries written in Clojure to start contributing?
16:40	abhir00p	I am looking for something beginner to intermediate
16:40	justin_smith	abhir00p: leiningen is very open to contributions, and keeps a list of newbie-friendly issues to fix on github
16:42	rhg135	but no releases
16:48	abhir00p	Thanks justin
16:48	abhir00p	Any other suggestions
16:49	abhir00p	I would like to take a look at atleast a couple of libraries
17:32	luckvery	I have a javascript to clojure question if anyone wouldn't mind a dm
19:57	raspasov	hey everyone - what's the state of affairs about Clojure tree-shaking, I recall Rich Hickey or someone else tweeting that some progress has been done but can't find the old link
20:19	justin_smith	raspasov: there's an option for lazy loading of libs, but you pay a runtime penalty because there's the extra step of checking if things are loaded before using them
20:19	justin_smith	that's not quite the same as tree-shaking though
20:38	Jabberz	so I noticed there's a bunch of schedulers (Quartzite, Chime, cronj, etc) -- any comparisons done out there, or recommendation for lightweight / memory optimal?
20:39	Jabberz	chime appears to be like 3 functions on top of core.async, so I presume is one of the lightest weight out there of them all
20:39	justin_smith	Jabberz: the most lightweight is definitely to use the native java scheduler class
20:39	justin_smith	Jabberz: http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ScheduledExecutorService.html
20:50	raspasov	justin_smith: thanks! I assume this will help for decreasing RAM usage but not for decreasing the JAR size?
20:50	raspasov	uberjar, I mean
20:51	justin_smith	right
20:51	justin_smith	and it helps startup time
20:57	raspasov	justin_smith: what is that feature called, can't easily find info about it?
21:00	justin_smith	raspasov: hmm... maybe that branch isn't so active... https://github.com/clojure/clojure/compare/fastload
21:00	raspasov	justin_smith: ok thanks anyway!
21:01	justin_smith	raspasov: there are also alternate compilers, like skummet
21:04	TEttinger	skummet!
21:07	raspasov	justin_smith: thanks Skummet looks cool
21:14	bashed	Instead of a list of strings, I want to use '(list of strings) in quoted form. Is there something that takes that and converts it to a list of strings?
21:14	bashed	Just so I don't have to use the double quotation for each element in the list.
21:15	Seylerius	bashed: Write your whole list as a single string, and split on linebreaks, maybe?
21:15	Seylerius	But that's a lot of lazy.
21:16	Seylerius	Why don't you want to individually quote your strings?
21:17	justin_smith	,(map name '(you mean like this?))
21:17	clojurebot	("you" "mean" "like" "this?")
21:17	justin_smith	because that isn't a list of strings, it's a list of symbols
21:19	bashed	justin_smith: Thats exactly what I wanted. Sorry for the wrong terminologies. I'm pretty new to lisp and clojure.
21:19	bashed	Thanks
21:30	weathered-tree	java interop question: I'm trying to use java.nio.file.Paths/get with a string. There is an overload which takes a URI. When attempting to compile it tries to cast the string to a URI throwing a ClassCastException. Am I calling this incorrectly?
21:30	justin_smith	weathered-tree: the method that takes string takes varargs strings
21:31	justin_smith	so you need to call (Paths/get "a" (into-array ["b" "c" "d"]))
21:31	justin_smith	or (Paths/get "a" (into-array String []))
21:33	weathered-tree	thanks!
21:33	weathered-tree	(inc justin_smith)
21:35	rhg135	he's not coming back it seems
21:35	rhg135	lazybot I mean
21:35	justin_smith	rhg135: there were talks, I may be the no botkeeper? who knows
21:35	justin_smith	s/no/new
21:36	rhg135	ah, I see
21:36	rhg135	get to work! :P
21:37	justin_smith	if/when there's a transfer of ownership, I'll be sure to get it running, it's on a host shared by Raynes and amalloy right now though
21:38	rhg135	why did it go down anyway?
21:38	justin_smith	rhg135: it's got this bug where it gets disconnected but is not aware it is disconnected, so requires a restart
21:40	rhg135	ah, would it be worth to excise irclj?
21:40	justin_smith	rhg135: what would the replacement be?
21:41	rhg135	pircbot is what clojurebot uses no?
21:42	justin_smith	is it?
21:42	rhg135	maybe, for sure it is not irclj
21:43	justin_smith	theoretically lazybot could use pircbot, I'd need to take a closer look to see how extensive a rewrite it would be
21:43	rhg135	pretty extensive
21:44	rhg135	the plugins rely on it
21:44	justin_smith	right, it wouldn't be a drop in replace, it would be pulling out irclj, then making an irclj compatible wrapper for pircbot
21:44	rhg135	yup
21:44	justin_smith	a full rewrite to be pircbot compatible would be a waste of time
21:45	rhg135	pircbot-shim
21:46	rhg135	pircbot-irclj-shim*
21:46	justin_smith	exactly
21:47	rhg135	when I did my datomic experiment, unfortunately a shim was not an option
22:50	naeluh	yo!
22:51	naeluh_SATureday	hello ? Hows it going
22:51	rhg135	hello, naeluh_SATureday, quite well.
23:19	naeluh_sat	yo
23:51	mkr	Hey, I am trying to create a web application with async FB login.
23:51	mkr	Facebook says that i have to include a lot of Javascript components provided in its pages
23:51	mkr	Is there a equivalent cljs wrapper?
23:52	mkr	anyone has a good wrapper that wraps FB SDK?
23:56	justin_smith	mkr: you can probably embed those components via interop, right?