#clojure – 2016-02-02

2016-02-02

00:16	patchwork	Are there any performance issues or otherwise with having deeply nested vectors? (like hundreds of levels deep)
00:16	patchwork	They are not broad, just deep
00:17	patchwork	Or is there a better data structure for representing deeply nested trees?
05:03	jonathanj	,#{:a :a}
05:04	clojurebot	#<IllegalArgumentException java.lang.IllegalArgumentException: Duplicate key: :a>
05:04	jonathanj	,(hash-set :a :a)
05:04	clojurebot	#{:a}
05:05	digiorgi	,(println "i'm happy")
05:05	clojurebot	i'm happy\n
05:07	steerio	,(:doc (meta #'hash-set))
05:07	clojurebot	"Returns a new hash set with supplied keys. Any equal keys are\n handled as if by repeated uses of conj."
05:07	jonathanj	,(doc hash-set)
05:07	clojurebot	"([] [& keys]); Returns a new hash set with supplied keys. Any equal keys are handled as if by repeated uses of conj."
05:08	steerio	I was afraid that'll return too many lines.
05:09	steerio	...but it's nifty that it has its own version of doc. :)
06:49	athinggoingon	testing
06:50	ecelis	Test failed :)
09:01	Kneiva	What is "-?>"?
09:02	wmealing	i'm far from being awesome at this, but is that used in a macro Kneiva ?
09:02	dysfun	i don't think that's core, which library is it from?
09:02	steerio	Kneiva: (doc -?>)
09:03	dysfun	,(doc -?>)
09:03	clojurebot	Pardon?
09:03	steerio	like you said, not core. :)
09:03	steerio	but they probably have it referred, so it'll work on their REPL
09:03	dysfun	no, that was clojurebot telling me the syntax was invalid :)
09:03	wmealing	i thought ~ meant it was used as unquoted in macros
09:03	wmealing	?> may be something else.
09:03	wmealing	it might be defined somewhere
09:03	steerio	,(list '-?>)
09:03	clojurebot	(-?>)
09:03	wmealing	in his code base
09:03	steerio	it's accepted as as symbol
09:04	steerio	(there could've been the possibility that ? is only acceptable in a final position)
09:04	dysfun	,(doc ->?)
09:04	clojurebot	Titim gan éirí ort.
09:04	dysfun	i see
09:04	steerio	i don't
09:06	dysfun	meanwhile, anyone know how to write Array.prototype.slice.call(div_list) in clojurescript? :)
09:07	ridcully	js/Array.slice?
09:07	Glenjamin	,(doc to-array) ; perhaps
09:07	clojurebot	"([coll]); Returns an array of Objects containing the contents of coll, which can be any Collection. Maps to java.util.Collection.toArray()."
09:07	dysfun	does that take a NodeList?
09:08	Glenjamin	(to-array (js/document.querySelectorAll "div")) seems to work
09:08	Glenjamin	tried it in http://himera.herokuapp.com/index.html
09:09	dysfun	ooh, nice, thanks :)
09:09	dysfun	so what's the easiest way to turn a nodelist into an appropriate cljs data structure?
09:10	Kneiva	-?> is mentioned in an example in a a readme of cemericks bandalore library
09:10	dysfun	(comp js->cljs to-array) ?
09:11	dysfun	okay, it's probably from bandalore then
09:12	dysfun	hrm, okay, i see it in the README
09:12	dysfun	i think it's probable he meant -> and typo'd it
09:13	dysfun	(great excuse to pull request it)
09:14	ridcully	or some-> in disguise?
09:14	dysfun	https://github.com/cemerick/bandalore
09:14	dysfun	i'm pretty sure it was ->
09:14	ridcully	maybe from some lib? isn't swiss arrows full of those?
09:14	dysfun	yeah my immediate thought was swiss arrows, but it's the only instance on the page and -> makes sense from a quick scan of the code
09:15	Glenjamin	probably a typo of ->>, since all other examples use ->>
09:15	dysfun	yeah, or that one
10:34	souterrain	Anyone using clojure with openjdk on FreeBSD? Any pitfalls?
10:34	wmealing	i used it on linux, i dont imagine it'll be much different
10:35	dysfun	souterrain: i don't have any practical advice yet, but if you get any good experience, i'd love for you to keep me up to date about it since i'm planning to deploy some clojure on freebsd soon
10:36	jsabeaudry	Is it correct to say that (send! ...) is pretty much (future (swap! ... ))?
10:36	souterrain	ok, will do. I'm a clojure noob so was hoping for some sage advice, but I will certainly relay my experiences.
10:37	dysfun	i think i was just sort of hoping it would work. i've seen a few patchsets floating about and a tool that builds jdk releases for freebsd
10:37	dysfun	but when we have acquired the kit and test it, we'll soon find out what's wrong
10:38	dysfun	remember that java runs on solaris as well, so i imagine the codebase is fairly portable
11:41	cortexman	can you explain what this is doing and why (def ^:dynamic base-url "https://news.ycombinator.com/")
11:41	cortexman	from the enlive tutorial
11:43	opqdonut	it defines a constant named base-url with the value "https://news.ycombinator.com/"
11:43	cortexman	that would be (def base-url "https://news.ycombinator.com/")
11:43	opqdonut	the :^dynamic marks the variable as dynamic, so you can override it locally with (binding [base-url ...] ...)
11:43	opqdonut	perhaps for testing
11:43	cortexman	ok thanks
11:44	opqdonut	in general ^ attaches metadata to the next thing
11:44	opqdonut	and :dynamic is metadata that the compiler interprets
11:44	opqdonut	you could also say for example (def ^{:doc "this is a docstring"} foo ...)
12:34	averagehat	Hello all. Does anyone know how to create a list of bounded size in core.logic?
12:39	Shayanjm	dam is clojars down?
12:39	justin_smith	again?
12:39	cap10morgan_	yes: http://status.clojars.org
12:42	cap10morgan	you can use a clojars mirror for reading (but not deploying new artifacts): https://github.com/clojars/clojars-web/wiki/Mirrors
12:55	fuuduCoder	is clojars down
12:55	tcrawley	yes
12:55	tcrawley	see http://status.clojars.org/
12:55	tcrawley	in the meantime, you can use https://github.com/clojars/clojars-web/wiki/Mirrors to still pull dependencies
13:31	tcrawley	clojars is back up, but upstream is still reporting issues, so we it may go down again: http://status.clojars.org/incidents/pdpppjllmjff
13:43	rcassidy	kinda funny that clojars opening line on the site is "clojars is a dead easy community repository...."
13:43	rcassidy	cos then I just read "clojars is a dead"
14:15	macrolicious	is there a command for evaluating a clojure expression a pointer is anywhere within, rather than at the end of, in an emacs buffer? maybe that's illogical, as emacs wouldn't know which expression to evaluate… although I often want to evaluate a block with a blank line before and after it.
14:15	macrolicious	I'm using cider, btw
14:18	macrolicious	once again, I'm asking an #emacs question in here, sorry
14:20	tolstoy	I think C-c C-c works, no?
14:31	justin_smith	macrolicious: C-M-x
14:34	amalloy	either of the two above commands work, presuming you want the top-level form
14:34	amalloy	if you want magical inference of subforms, then as you guessed you are out of luck
14:36	rhg135	I'm pretty sure fireplace did this with 'cpp'
14:39	ridcully	cpp is for where your cursor is, :Eval for the whole form
14:40	rhg135	I think that's what he meant, but i'm not sure
14:40	csd_	Will it create a race condition if i have a function that does (do (quartz-delete-task...)(quartz-add-same-task-id)) where those functions are actually writing to a core async channel which then from a go-loop does the work?
15:04	macrolicious	C-c C-c did the trick! playing with theo others now
15:14	rhg135	that issue with lazybot reconnecting to a void may be a freenode thing
15:15	rhg135	or a common bug in irc code
15:15	Shayanjm	for some reason requiring clj-http.client is throwing a weird error for me suddenly
15:17	Shayanjm	namespace 'potemkin.utils' not found
15:18	Shayanjm	http://pastebin.com/GCD8hAGF
15:18	Shayanjm	narrowed it down to it being caused by clj-http but not sure why/how to fix
15:19	dakrone	Shayanjm: probably due to version conflict on classpath, check out `lein deps :tree` and see where else potemkin is being pulled in
15:22	melipone	hiya! is it possible to have a variable number of arguments and also some keywords as arguments to a function?
15:22	Shayanjm	dakrone: Just did lein deps :tree and weirdly its only a dep of clj-http
15:23	dakrone	Shayanjm: what version of clj-http? can you gist the deps somewhere?
15:23	Shayanjm	but there are some suggested exclusions which throw kafka-clj into question, despite potemkin not showing up under its deps
15:23	Shayanjm	yup
15:23	Shayanjm	i'll gist the whole output
15:24	Shayanjm	dakrone: https://gist.github.com/shayanjm/89192c933ec6598494c3
15:28	dakrone	Shayanjm: hmm.. doesn't look like it should be a problem, fun-utils also uses potemkin, but 0.4.1 (same version as clj-http)
15:28	dakrone	if you manually put potemkin 0.4.1 in your project.clj and try it does it work?
15:28	Shayanjm	Let me check
15:28	dakrone	do you have a plugin that might be interferring?
15:30	Shayanjm	dakrone: nope, didn't work. And not that I know of, but let me check
15:32	Shayanjm	dakrone: I don't think any of these conflict
15:32	dakrone	you removed the original paste :( now I can't see the error again
15:32	Shayanjm	oh shit my bad 2 secs
15:33	Shayanjm	dakrone: https://gist.github.com/shayanjm/7aabb450c36d4a899354
15:35	dakrone	hmmm... doesn't really make sense to my why it wouldn't be there..
15:35	dakrone	is this a public project I can try out?
15:38	Shayanjm	dakrone: not at the moment unfortunately
15:39	Shayanjm	dakrone: if you want I can add you to the private project quickly?
15:45	Kamuela	Seems like this book Clojure Applied is exactly what I need for this phase
15:45	cortexman	i'm new to clojure and wanting to use clj-webdriver. however, these instructions are really obscure https://github.com/semperos/clj-webdriver/wiki/Clojure-and-Java-Dependencies
15:45	cortexman	i obtained selenium-java-2.50.1.zip - now where do i put its contents?
15:45	cortexman	just on my CLASSPATH?
15:45	dakrone	Shayanjm: I can try and look, but I'm not an expert where classloading is concerned :-/
15:45	cortexman	it says "You must add the Selenium-WebDriver JAR's you need explicitly in your project's dependencies. This library does not ship with runtime dependencies on any version of Selenium-WebDriver to allow compatibility with Selenium-WebDriver's upstream releases."
15:46	Shayanjm	No worries, would love a second opinion anyway. Mind sending me over your gh username?
15:46	cortexman	however, there is no example code for what that explicit dependency should look like
15:55	cortexman	annnd nothing.
16:23	blake__	I want to pass data to a Reac component function. The server's sending data and I want to use that to update the component. Should I just create an atom and update that rather?
16:23	dakrone	Shayanjm: dakrone :)
16:25	blake__	It seems so ... non-Clojure-y. =P
16:32	dysfun	blake__: a future perhaps?
16:32	dysfun	or promise. i always forget which is which
16:32	blake__	Hmmm.
16:33	dysfun	or a core.async channel
16:33	blake__	I'm not sure how that would get the data to the component.
16:33	dysfun	which approach?
16:34	blake__	Either, really. It seems like you encapsulate a zero-parameter function to make a react comopnent.
16:35	dysfun	i have to confess i haven't really used react directly, so i don't know how it models state
16:35	dysfun	but there are a bunch of clojurescript react tools
16:35	dysfun	and you can use them with all of these approaches
16:36	blake__	Everything I've seen has state in an atom. So I guess that's what I'll do.
16:36	dysfun	you might just want to use someone else's library
16:36	dysfun	i think reagent looked most promising last time i was playing, but i went off react
16:37	blake__	dysfun: I'm using reagent. =)
16:37	dysfun	right, my memory is a bit hazy, but i'm sure you can use that with atoms
16:37	dysfun	(it does seem to be the most sensible way to manage state)
16:38	blake__	Sure. I was trying to avoid atoms. 'cause the actual state is the displayed object.
16:39	dysfun	i remember it all being generally quite frustrating
16:41	blake__	Well, I'll see how well this works out for me. Reagent seems pretty straightforward.
16:41	dysfun	yes, i think it's about as good as it gets without ripping out the javascript element entirely
16:46	averagehat	blake__, reagent should handle interfacing with react for you?
16:48	blake__	averagehat: Sure. But in straight Clojure, I'd expect to call a function with the parameters describing how to draw the component.
16:48	blake__	But I think the "automaticity" requires state.
16:49	averagehat	I'm not quite sure what you're looking for, but reagent revolves around atoms. The atoms trigger the re-rendering functions that dereference that atom
17:52	MJB47	in-ns ?
18:01	amalloy	(doto 'ns require in-ns)
18:08	devth	MJB47: doesn't load it
18:08	devth	amalloy: yeah ok. not that bad
18:08	devth	meanwhile: clojure.lang.Reflector.invokeInstanceMethod on prod box that I can't reproduce locally :(
18:22	amalloy	devth: what can't it find? nobody can help if you truncate the useful part of an error message
18:22	devth	not really asking for help. just lamenting the sadness of invokeInstanceMethod
18:22	devth	it came from tentacles
18:23	devth	found out why - i had a slight config difference and github was 301'ing on a post
18:23	devth	which causes tentacles' `safe-parse` to blow up
18:24	devth	thanks for the offer though :-)
19:23	tolstoy	Hm. Is it possible to use prismatic schema to validate a map for just one or two keys, not all of them? As in, not have to mention all possible "optional" keys?
19:24	justin_smith	tolstoy: you can add a k/v that basically mean "any set of kays with any values are allowed"
19:25	justin_smith	*keys
19:25	justin_smith	or you can do a select-keys first, and validate what remains
19:25	tolstoy	Oh, that might do it.
19:26	tolstoy	I mean, select keys sounds great. If only my map wasn't so nested.
19:28	justin_smith	tolstoy: {s/Any s/Any :a s/Int} => validates as long as you have :a mapped to an integral, doesn't care what other keys are or are not present
19:28	tolstoy	So, s/Any can map to multiples? I'll try it. ;)
19:29	justin_smith	yeah, it will hapilly map to anything
19:30	tolstoy	I don't know why they don't have these extreme corner cases I'm interested in right there on the front page! ;)
19:32	tolstoy	Worked!
19:50	mb123	compojure-api: do you guys have an example of passing command line arguments with an uberjar?
19:51	justin_smith	mb123: java -jar my-uber.jar a b c d
19:51	justin_smith	a b c and d are command line args
19:52	justin_smith	or, java -cp my-uber.jar clojure.main -m my.ns a b c d
19:54	mb123	justin_smith: ah, we did that, but getting "clojure.lang.ArityException: Wrong number of args" when using this library https://github.com/metosin/compojure-api
19:54	justin_smith	mb123: does it define main for you or something?
19:56	justin_smith	mb123: I see this, for example, which would mean it eats all your command line args and sends them to start
19:57	justin_smith	which would be specified by :start in project.clj
19:57	justin_smith	err, this that is https://github.com/metosin/compojure-api/blob/71ae7304b0f9cbb7cfa50d381b1bf7559c117809/src/compojure/api/main.clj#L16
19:59	mb123	ah gotcha, thanks justin_smith
20:09	lockdown	does someone has the clojure applied book close to him?
21:02	sfz-	Is it possible to have a let assignment that can be used within all blocks of a multi-signature function?
21:03	sfz-	But that's local to the function, not the namespace?
21:05	sfz-	Ah, nevermind, I figured it out, just needed to use (def f (fn)) instead of shortcut (defn f)
21:13	ferz_	is there a way to connect to nREPL on a specific port from a terminal?
21:14	justin_smith	ferz_: lein repl :connect <port>
21:15	ferz_	that did it, thanks, I couldn't find info online for some reason.
21:16	justin_smith	for future reference, lein help, lein help repl, etc.
22:30	Shayanjm	justin_smith: gotta pick your brain about kafka again if you have a bit...
22:31	Shayanjm	I'm using this: https://github.com/gerritjvv/kafka-fast/ and having some trouble making my consumer work.
22:38	justin_smith	Shayanjm: be back in a moment
22:39	Shayanjm	take your time :)
22:52	justin_smith	Shayanjm: so what's the issue?
22:54	justin_smith	Shayanjm: are you sure this is a kafka lib and not a redis wrapper that inexplicably has kafka in the name?
22:57	justin_smith	Shayanjm: OK, looks like this lib implements the kafka server / client in clojure, but does not use the actual kafka implementation from the kafka project at all
23:09	justin_smith	Shayanjm: oops, leaving again, maybe we can catch up tomorrow
23:30	Shayanjm	justin_smith: sorry about that - just got back to my desk
23:30	Shayanjm	let me know if you're still there otherwise I'll pick your brain tomorrow