#clojure – 2015-07-16

2015-07-16

00:02	TEttinger	,(boolean 0)
00:02	clojurebot	true
00:02	TEttinger	,(boolean (/ 0.0 0.0))
00:02	clojurebot	true
00:02	TEttinger	,(if Double/NaN true "wat")
00:02	clojurebot	true
00:07	whomp	is traversal of a set as a sequence deterministic?
00:25	tomjack	whomp: I _think_ (= (seq xs) (seq xs)), but definitely not necessarily (if (= xs ys) (= (seq xs) (seq ys)))
00:36	vas	So I want to make a "remember which page the user requested and forward them after they log in" feature
00:39	H4ns	vas: popular solutions include including the original url in the login form as hidden parameter, in a query parameter of the login page, using an extra cookie or storing the url in the user's session if you already have session tracking set up at that point.
00:40	vas	H4ns: thank you so very much. My login system is a bit different in that a user just gives me their email and I send them a login link which they must click to login. I'm going to try setting a session variable and see if that does the trick (assuming the user uses the same browser for both accesses)... perhaps it makes sense to encode it into the login link.
00:42	H4ns	vas: a session variable is unlikely to work unless you have persistent sessions and can refer to them through the url that you send out. i'd just use a parameter in the url.
00:44	H4ns	vas: ah, i did not read carefully. anyway, an extra parameter will be more robust. you could also store the "initial url" in the user's record in the database if you want to avoid the extra parameter.
00:49	vas	H4ns: Thanks, that makes sense. I think I'll just tag it onto the link. I'm avoiding database reads/writes by just checking a hash in the provided link/URL instead of reading to see if the user has the credentials so avoiding a db read would be in keeping with that.
00:50	vas	H4ns: there is an initial read to make sure the user has the right privs and all when they request a link, but the handler just checks a hash (which can only be received with proper creds). ... dunno if i explained that well enough but you might get the picture
00:52	crocket	Hello clojour guys
00:52	crocket	multimethod rocks.
00:52	crocket	It lets me code polymorphic behaviors without types.
00:57	vas	H4ns: anyway, thanks for your help :D
00:57	H4ns	vas: yw
01:12	bcham	Can someone help me?
01:12	bcham	I can't seem to find why these two functions aren't equivalent
01:13	bcham	(defn clean-code [class-name]
01:13	bcham	#((html/wrap :pre) (html/wrap :code '{class (str "src" class-name)}) (html/text %)))
01:13	bcham	(defn clean-code [class-name]
01:13	bcham	(fn [x] ((html/wrap :pre) ((html/wrap :code '{:class (str "src " class-name)}) (html/text x)))))
01:13	bcham	why aren't those equivalent?
01:21	crocket	bcham, Do you want (= f1 f2) to return true?
01:22	bcham	I get an arity issue when I use the first one in another function, but not if i use the second function
01:22	crocket	Plus, your functions are awfully difficult to read.
01:22	bcham	and I can't seem to figure out why.
01:22	bcham	baby steps crocket :)
01:23	bcham	I don't want to functions themselves to be equal, rather i want what they do to be equal.
01:24	crocket	They are not equal
01:25	bcham	empirically I know that, I'm wondering why.
01:25	crocket	bcham, I formatted those functions in emacs clojure-mode, and I got http://dpaste.com/1KTZV06
01:25	crocket	They are not equal.
01:25	crocket	You got parens wrong.
01:26	crocket	Also, there are other differences.
01:26	crocket	You should look for differences.
01:26	bcham	what's the hot key to format in clojure-mode?
01:26	bcham	I will thank you.
01:26	crocket	bcham, tab
01:27	crocket	bcham, You should seriously learn emacs.
01:27	bcham	I use emacs
01:27	crocket	I don't think you use emacs effectively.
01:28	crocket	By the fact that you don't know how to use TAB in emacs, I think you're a newbie.
01:28	bcham	I am.
01:28	amalloy	crocket: this is not very welcoming behavior
01:28	crocket	And, you should use a pastebin to paste codes.
01:29	bcham	Thank you for the feedback, as I sated above. I'm just learning. "Baby steps" means I don't know what I'm doing, and am trying to figure it out.
01:30	amalloy	bcham: you're doing just fine. do keep in mind refheap.com for pasting larger snippets in future
02:11	crocket	How do I call a function whose symbol obtained by (symbol "log" "info")?
02:12	H4ns	if you're thinking clojure.tools.logging/log, then that is a macro and cannot be called.
02:12	crocket	no
02:13	crocket	It's taoensso.timber/info
02:13	crocket	(require '[taoensso.timber :as log])
02:14	rpaulo_	is there any lisp language that you can compile and deploy?
02:14	TEttinger	rpaulo_: sorta an odd question, what do you mean by deploy?
02:14	rpaulo_	I'm looking for something small that can be run standalone on a server
02:15	H4ns	crocket: ((resolve (symbol "log" "info")) [arg])
02:15	rpaulo_	i.e., without installing the actual VM (it would be bundled in the file)
02:15	TEttinger	small as in language or small as in installation requirements?
02:16	rpaulo_	installation requirements
02:16	TEttinger	there are almost certainly Common Lisp implementations that produce somewhat small binaries. there's more work done at the embedded-ish hardware field with Scheme variants than Common Lisp ones.
02:17	rpaulo_	scheme would work too
02:17	TEttinger	I'd look into Chicken Scheme and maybe Gambit Scheme
02:17	TEttinger	I'm no expert there though
02:17	rpaulo_	nice, thanks
02:27	crocket	H4ns, good
02:55	crocket	http://dpaste.com/2G6Y88A is a config file for DDNS client I'm writing.
02:56	crocket	I want a function named update! to behave differently according to provider name.
02:56	crocket	How should I implement it?
02:56	H4ns	so you're doing the resolve/symbol thing to log at the correct level? sounds gross.
02:56	crocket	Protocol + record, multimethod, or ???
02:56	lazybot	crocket: How could that be wrong?
03:00	crocket	hmm....
03:00	crocket	Currently, it separates provider name from config.
03:00	crocket	This justifies passing two arguments to a multimethod.
03:07	crocket	https://github.com/crocket/clj-ddns-client/blob/master/src/clj_ddns_client/providers/dnsever.clj#L28
03:07	crocket	I feel that this is wrong.
03:08	crocket	Why should I have to pass the name of provider to a log function?
03:08	crocket	I shouldn't have to
03:19	crocket	Ok, this is ok.
04:09	crocket	Wow
04:10	crocket	Is there an eager version of map?
04:12	crocket	(doall (map...
04:40	crocket	Do you usually avoid dynamic vars?
04:49	magnars	crocket: if you want an eager map, you could use mapv - but maybe you are doing side-effects and should look at doseq?
05:37	Pupeno	Is it possible to somehow resolve a symbol to the namespace it is located in lexically, and not dynamically? Inside the namespace korma.db I'm doing this (ns-resolve 'korma.db (symbol protocol)) and I would like not to have to repeat myself with korma.db there.
05:42	oddcully	Pupeno: just `resolve`?
05:43	Pupeno	oddcully: that resolves to the current dynamically scoped namespace, not the lexically one.
05:44	Phoh4ang	So I've tried clojurescript with figwheel+cider and it's totally awesome, everything works, super cool! But now I want to have not only cljs repl, but the clojure one too. I'm not sure how can I get one more repl buffer in cider without starting another jvm process. Can anybody give a direction?
05:45	Phoh4ang	Pupeno: there is no such thing as "lexical namespace". I guess you are writing macro; google about &env and &syms hidden arguments.
05:46	Pupeno	Phoh4ang: no, I'm not writing a macro, I'm calling a function by having the name on a string. Since there's no lexical namespace, I'll have to hard-code it.
05:47	Phoh4ang	Pupeno: I'm not sure what do you mean... So you have to call a function by its name given as a string, and the function is defined in a let block?
05:47	Phoh4ang	So (let [foo (fn ...)] (magic "foo")) something like this?
05:47	Pupeno	Phoh4ang: no, the function is a top level function in the namespace 'korma.db.
05:48	Phoh4ang	Pupeno: well then you don't need anything "lexical" at all, just use ns-resolve or whatever.
05:49	Pupeno	Phoh4ang: well, with ns-resolve I have to specify the namespace 'korma.db when this function I'm writing is already in the 'korma.db namespace and I was hopping to be able to infer it (so that for example, if the name of the namespace changes, it doesn't break).
05:50	Phoh4ang	Pupeno: eh, what's wrong with just `resolve` then?
05:51	Pupeno	If I'm in namespace foo.bar and I call korma.db/db-uri and db-uri evaluates (resolve :func), it evaluates to foo.bar/funk, not korma.db/func. I want korma.db/func.
05:51	Pupeno	(db-uri is the function I'm writing)
05:52	Phoh4ang	Ah, you have a function, not a macro, right. Well just save the ns somewhere when you defining your function.
05:52	Phoh4ang	Like (let [my-ns ns] (defn my-fn ...)) or something similar. It should work, if I undestand thing correctly.
05:57	Phoh4ang	Pupeno: yep, just quickly checked it: https://www.refheap.com/106617 that's what you want, right?
05:57	Pupeno	Phoh4ang: yes.
05:58	Pupeno	Phoh4ang: I don think the loss in readability of having a defn inside a let is not worth the gains in the case the namespace name changes or something like that.
05:59	Pupeno	Phoh4ang: but it does answer my question.
05:59	Phoh4ang	Pupeno: well, having defn inside a let doesn't reduce readibility at all in my opinion.
06:00	Pupeno	I can see that. I'm contributing to someone else's code, so I'm trying to stay as readable and clean as possible
06:02	Phoh4ang	Oh, I see. Actually it's kinda interesting. I can't imagine why such weird thing with all that resolving stuff is required.
06:04	Pupeno	Phoh4ang: in korma.db there's a set of functions named after database protocol, postgres, mysql, oracle, etc. They enhance a database connection specification with some sane defaults. I'm making a function that takes a jdbc uri (instead of a hashmap with user, pass, host, db, port, etc) and calls the appropriate function, mysql, postgresql, etc. So I'm extracting the name of the function I'm calling from the jdbc uri: ht
06:04	Pupeno	tps://gist.github.com/pupeno/bc0363f61e0da2d73da4
06:09	Phoh4ang	Pupeno: hm, I see. That makes sense, though imho it would be somewhat clearer to explicitly define these functions with a special macro which would maintain a map of strings->functions.
06:09	Phoh4ang	On the other hand, less code is better.
06:21	Akshay	why clojure not lisp
06:21	Akshay	??
06:21	lazybot	Akshay: What are you, crazy? Of course not!
06:21	clojurebot	BOT FIGHT!!!!!111
06:25	loke	Note that Akshay just asked the opposite thing on #lisp
06:25	oddcully	what was the bot response there?
06:28	loke	oddcully: No bot response.
06:28	ronh	<loke> There are no benefits to clojure compared to Lisp
06:28	loke	Yep
06:28	oddcully	then clojure wins clearly in terms of bot hilarity
06:28	loke	oddcully: Indeed
06:28	loke	I somewhat intentionally fed the troll
06:29	tdammers	bot hilarity is strictly the most important factor in a programming language's success
06:29	loke	tdammers: the #lisp bot used to do meme quotes
06:29	loke	Like doge
06:29	H4ns	back in the day, when it still worked
06:29	loke	Since it doesn't do that anymore, I guess that's the death of lisp :-(
06:31	tdammers	death of lisp... not again...
06:34	loke	tdammers: None of us want that, I think. Therefore the #lisp bot must immediately be fixed.
06:34	H4ns	loke: you can discuss #lisp's problems in #lisp, i guess :)
06:34	loke	H4ns: Yes
06:35	loke	H4ns: But you'd kick me if I did :-)
06:35	H4ns	loke: i got no ops and with my temper, it is good that way
06:48	crocket	less is better
07:14	crocket	Does anyone know a good clojure logging library than timbre?
07:14	crocket	Does anyone know any other good clojure logging library than timbre?
07:14	crocket	timbre doesn't have a decent rolling appender.
07:17	oddcully	unilog?
07:21	crocket	unilog?
07:22	crocket	unilog uses logback.
07:22	crocket	an uberjar would have to include logback as well.
07:33	crocket	So, I'd have to choose between small and big.
07:40	xificurC	yesterday I got a recommendation for fighweel and react from justin_smith. Can anyone point me to some nice guide to cljs in general and possibly these libs? I did clojure for a couple of months when it was 1.3 so I'm not completely clueless, but not up to speed either
07:41	kwladyka	if i want to do random test x times should i use "dorun" or is there something better?
07:43	oddcully	xificurC: have you seen the figwheel quickstart? https://github.com/bhauman/lein-figwheel/wiki/Quick-Start
07:45	oddcully	xificurC: there are lots of libs around react (om, reagent, rum, ...)
07:45	oddcully	xificurC: also clojurescript has it's own irc channel - just fyi
07:49	xificurC	oddcully: no I haven't, and that actually links to a quick start for cljs as well, thanks
07:58	kwladyka	https://www.refheap.com/3fc8e81c4cf03e0631232fb53 - how to run this test x times? The problem is when i do (dorun x (deftest)) or (deftest foo (dorun x (testing))) etc. it wouldn't work because deftest has to be first and is has to be first in testing etc.
08:14	noncom	kwladyka: what?
08:15	noncom	kwladyka: can you describe more? i don't get your question
08:15	kwladyka	noncom, i want run this test x times, how to do that?
08:15	kwladyka	it is random test so i want run it more then once
08:16	kwladyka	and it is not so simple as it looks :)
08:17	noncom	kwladyka: are you using this? https://clojuredocs.org/clojure.test/deftest
08:18	kwladyka	noncom, as i shown https://www.refheap.com/3fc8e81c4cf03e0631232fb53
08:18	noncom	so, yeah
08:18	kwladyka	the problem is about "is" in tests
08:18	kwladyka	because of java.lang.IllegalArgumentException: Don't know how to create ISeq from: java.lang.Boolean
08:19	kwladyka	this exception occur when somebody is between is and testing or between testing and deftest
08:19	noncom	can you post full stack trace?
08:19	kwladyka	"is" has to be always just behind "testing" or "deftest"
08:20	kwladyka	noncom, https://www.refheap.com/e18f0703e8291bc76681dcc15
08:20	kwladyka	*somebody - something
08:21	kwladyka	you can do this in repl, just change my code to anything else, even (= 1 1)
08:21	kwladyka	and try do it 5 times
08:25	kwladyka	maybe what i am trying to do is impossible with clojure.test and i have to use additional library like test.check
08:25	kwladyka	but honestly i dont want in this case
08:30	m-erger	is closure a good first language?
08:30	kwladyka	mmm but maybe i will do (for) or something like that in condition and i will return list of true/false.... i don't see better solution
08:31	kwladyka	m-erger, i don't know. I am not sure somebody try. It is still new technology :)
08:32	kwladyka	m-erger, i think it is like question about is it better to start play on violin or guitar or something like that
08:32	wasamasa	m-erger: closure is a concept, not a language
08:32	noncom	m-erger: from me, i'd say "yes"
08:33	noncom	kwladyka: hmmm, honestly i never used the testing framework...
08:33	noncom	kwladyka: so, you need to run this very test like 100 times and get the 100 results, right?
08:34	kwladyka	wasamasa, i guess it is misspell and he wanted write clojure?
08:34	kwladyka	noncom, yes
08:35	kwladyka	first i wanted to run test x times, but now i see only one solution using clojure.test is return '(true true true true true ....) to check condition
08:35	kwladyka	it is still good but no so elegant :)
08:36	kwladyka	just it makes code more unreadable
08:37	m-erger	closure is a concept?
08:38	oddcully	m-erger: cloJure vs cloSure
08:38	noncom	m-erger: https://en.wikipedia.org/wiki/Closure_(computer_programming)
08:40	kwladyka	which function works like (for [x (1 2 3 4 5)] body) but like (f 5 body)? I mean i want this function to return results like for, but i don't need input as x
08:41	kwladyka	i can't find function like this, maybe is it just doesn't exist? :)
08:43	lumafi_	how about repeatedly
08:43	noncom	repeatedly, yes
08:45	kwladyka	(repeat x body) :)
08:50	kwladyka	so if somebody is interested in it is my solution https://www.refheap.com/106622
08:50	kwladyka	i am not repeating tests, but i am repeating the condition
08:51	kwladyka	i don't see any other way
08:59	tgoossens	is it possible (not just plain JavaCompiler) in clojure to take clojure code and compile it
08:59	tgoossens	and how?
09:01	tgoossens	as far as I understand clojure
09:01	tgoossens	this should be extremely easy
09:01	puredanger	call the http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/compile function
09:02	tgoossens	-.-
09:02	tgoossens	thanks puredanger
09:02	puredanger	most build tools have a way to ahead-of-time (AOT) compile many source files
09:05	tgoossens	puredanger, What I actually am going to do is (using instaparse) to convert a DSL into clojure code wich then needs to be compiled to a java class
09:05	tgoossens	*which
09:06	puredanger	I presume you have requirements that rule out the option of gen-class ?
09:07	tgoossens	not that I'm aware of
09:07	tgoossens	(yet)
09:07	tgoossens	that might be a good idea actually
09:08	puredanger	well depends on your process a bit but it's effectively a Clojure DSL to generate Java classes
09:08	kwladyka	is function like repeatedly but without lazy-seq?
09:08	puredanger	but it can't do everything
09:08	kwladyka	i don't wont unnecessary (take x)
09:08	tgoossens	puredanger, thanks for the hint :)
09:08	kwladyka	i just want something like (repeatedly 5 f)
09:09	tgoossens	puredanger, now i'm going to try and figure out how to take a string of generated clojure code and use core.compile on it
09:09	kwladyka	or in another words something like (for [x (range 5)] body) but (for 5 body)
09:10	kwladyka	what i did last time when i asked doesn't work
09:10	kwladyka	so problem coming back :)
09:11	snowell	kwladyka: repeatedly takes an optional length arg
09:11	snowell	So (repeatedly 5 f) should work
09:11	puredanger	loop?
09:11	clojurebot	loop is https://www.refheap.com/90332
09:11	kwladyka	snowell, thx!
09:12	kwladyka	puredanger, loop is not the same, because it return values in another way
09:14	puredanger	if you're collecting results in addition to running side-effecty functions, you should look at run! (new in 1.7)
09:14	puredanger	actually I guess you can't return results with run!
09:15	puredanger	but you could get similar eager return with reduce
09:17	fourq	Anyone here know the answer to Anna's clojure question posted on Twitter? I'm curious too. https://twitter.com/AnnaPawlicka/status/621667387847348224 "#clojure folks, why isn't x cleared when it’s a number in a ^:once-decorated function, but is for strings & keywords? "
09:18	Bronsa	fourq: Herwig responded
09:18	fourq	Is that the answer?
09:18	kwladyka	huh so who can explain this magic ? https://www.refheap.com/b41e5a2b51028306dbefb883d for [x (range 3)] works but repeatedly 3 throw exception
09:18	Bronsa	fourq: only Objects can be set to null, x is a primitive long in that binding
09:18	fourq	he said "i bet"
09:18	kwladyka	ClassCastException java.lang.Boolean cannot be cast to clojure.lang.IFn clojure.core/repeatedly/fn--4750 (core.clj:4716)
09:19	Bronsa	fourq: well that's the right answer anyway :)
09:19	kwladyka	so magic :)
09:19	fourq	=)
09:19	fourq	thanks Bronsa
09:20	snowell	kwladyka: Try putting a # before the call to make it an anonymous function.
09:21	snowell	Right now it's using the return value, where repeatedly needs a Fn
09:21	kwladyka	snowell, oh....
09:22	kwladyka	snowell, thx
09:23	kwladyka	i need a brake
09:31	kaiyin	how can i `lein deploy clojars` without entering password every time?
09:32	tcrawley	kaiyin: take a look at https://github.com/technomancy/leiningen/blob/master/doc/DEPLOY.md#gpg
09:54	kaiyin	tcrawley: thanks!
10:18	kwladyka	what is the best way to not pass all the time the same parameters to all functions? i have parameter cols and rows which mean number of columns and number of rows. I need this information in almost every function in namespace. Should i use ref or atom or something like that or another solution?
10:19	snowell	You could always (defonce cols 8) at the top of the ns
10:19	snowell	Who doesn't like a good global variable? :D
10:20	kwladyka	snowell, but rows and cols are not constant
10:20	snowell	Ha, oh...
10:21	kwladyka	i have to operate on board
10:21	kwladyka	but board can have different dimension each time
10:21	kwladyka	but i have many operations on each board and each operation need to know about size of this board
10:21	snowell	You can probably make a Board object with things like deftype and just pass that around
10:22	snowell	Having no experience with that sort of thing in clojure, however, I will defer to others :)
10:22	kwladyka	but still in all function i need to add additional parameter, i am not sure it is good way
10:22	kwladyka	or maybe it is
10:23	kwladyka	i have this code to remember terminal size:
10:23	kwladyka	(def terminal-size (ref [0 0]))
10:23	kwladyka	(defn handle-resize [cols rows]
10:23	kwladyka	(dosync (ref-set terminal-size [cols rows])))
10:23	kwladyka	and maybe it is good idea to remember board size
10:23	kwladyka	or maybe i shouldn't do that and i should pass this as parameter
10:24	kwladyka	i am not sure how looks the best practice
10:24	snowell	I might consider using deftype to define a Board, with cols and rows fields
10:24	snowell	Then you can pass the Board into your function and read the cols and rows from it
10:25	snowell	Differently-sized boards would then just be separate Board objects
10:25	kwladyka	and also i have to pass iteration, because i draw many boards on screen and i have to know which one it is
10:25	kwladyka	and again i have to pass to all functions additional parameter
10:26	kwladyka	but maybe it is like it should be
11:04	justin_smith	kwladyka: the error you got with the test was not related to testing or is or deftest, it is some issue with your code https://www.refheap.com/106627
11:05	kwladyka	justin_smith, the problem wasn't about that
11:05	justin_smith	kwladyka: also, you can run is inside a doseq or loop
11:05	kwladyka	but it is solved anyway
11:05	justin_smith	OK
11:06	kwladyka	justin_smith, hmm i tried with (dorun 5 (is)) and it didn't work
11:06	kwladyka	but maybe i did some mistake
11:10	justin_smith	kwladyka: that's not how dorun works...
11:10	kwladyka	5
11:11	justin_smith	kwladyka: test updated to use totimes to run is 100 times https://www.refheap.com/106627
11:11	justin_smith	*dotimes
11:12	kwladyka	oh yes dotimes not dorun, sorry i have mess in my head after all day
11:12	kwladyka	but for me it wasn't work... mmm so good to know it works
11:17	kwladyka	justin_smith, hmm and why it doesn't work with dorun? Is any function works like dotimes but without x? (dotimes [x 5]) - i know i can use _
11:18	kwladyka	it didn't work because i was trying use dorun...
11:18	justin_smith	kwladyka: dorun is a function that forces a lazy value without holding onto the results
11:18	justin_smith	that is all it does
11:18	justin_smith	,(dorun (map inc (range 100)))
11:18	clojurebot	nil
11:18	justin_smith	,(dorun (map inc (range 1000000000)))
11:19	clojurebot	eval service is offline
11:19	kwladyka	oh...
11:19	justin_smith	that timed out
11:19	justin_smith	because it was evaluating every inc
11:22	kwladyka	do you have maybe any idea can i find font with size NxN (square)? I need that for console to draw board
11:23	justin_smith	kwladyka: quick google finds this http://www.dafont.com/theme.php?cat=301
11:23	kwladyka	yeah but i didin't mention as default system font :)
11:24	justin_smith	kwladyka: what system?
11:24	kwladyka	every :)
11:24	justin_smith	that's a really tall order
11:24	kwladyka	i need only numbers, Q, K, B, N, B letter
11:24	kwladyka	and space
11:25	kwladyka	i know :)
11:25	justin_smith	wouldn't it just be easier to make some tiles and use those instead of a font?
11:25	kwladyka	but my purpose is to have board to be square on screen
11:26	kwladyka	justin_smith, i use clojure-lanterna
11:26	kwladyka	i don't know any better solution
11:30	kwladyka	i don't know any better solution to draw in console board
11:31	kwladyka	chess board exactly
11:33	justin_smith	and you control the font of the console?
11:34	kwladyka	justin_smith, yes it has option to set font http://sjl.bitbucket.org/clojure-lanterna/reference/#font-names
11:35	justin_smith	oh, it launches a new terminal window, you could do it that way, of course :)
11:35	kwladyka	this is just to be good if i achieve square but it is not the main problem
11:36	justin_smith	at first I thought that meant it was somehow changing the font from inside the terminal (which afaik is not possible)
11:37	kwladyka	but still i don't know how to draw square board :)
11:37	kwladyka	because font is not square
11:39	kwladyka	but... maybe it is just mission impossible :)
11:39	TimMc	mission improbable
11:40	justin_smith	TimMc: cue theme music. Zoom in on man in black, climbing down a rope, to buy a lottery ticket.
11:42	TimMc	"The Terms and Conditions, should you choose to accept them..."
11:42	justin_smith	rofl
11:43	kwladyka	i need definitely break, going train Wing Tsun. See you later! :)
11:46	sdegutis	Hello. This is my question. Is Instaparse suitable for parsing an INI file. Thank you for your time. Good bye.
11:46	blkcat	um
11:48	wasamasa	this is even weirder than that guy's requests over at #emacs
11:48	hellofunk	clj ninja: two maps, same keys. want new map containing only keys where value is different, always using the second map's values where applicable. what's a good one-liner to do this?
11:53	oddcully	the ninja disqualifies me, but i'll give it a shot ,(into {} (let [old {:a 1 :b 2} new {:a 1 :b 3}] (filter (fn [[k v]] (not (= (k old) v))) new)))
11:55	justin_smith	oddcully: that's better than mine was going to be
11:57	hellofunk	oddcully: was hoping for something even more elgant. i asked because i too come up with these little monsters
11:58	hellofunk	where is amalloy when you need him
11:58	justin_smith	,(first (reduce (fn [[m' m] [k :as e]] (if (= (find m k) e) m' (conj m' e))) [{} {:a 0 :b 1 :c 2}] {:a 0 :b 1 :c 3})
11:58	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
11:58	justin_smith	err
11:58	hellofunk	glad to know this simple task requires much verbosity from others than just me :)
11:59	sdegutis	Does anyone know whether this is the case or not. Thank you.
12:00	ambrosebs	hellofunk: tried clojure.data/diff ?
12:00	amalloy	(into {} (remove (set m1) (select-keys m2 (keys m1))))?
12:01	amalloy	,((fn [m1 m2] (into {} (remove (set m1) (select-keys m2 (keys m1))))) {:a 1 :b 2} {:a 1 :b 3})
12:01	clojurebot	{:b 3}
12:01	justin_smith	,(let [m {:a 0 :b 1 :c 2}] (reduce (fn [m' [k :as e]] (if (= (find m k) e) m' (conj m' e))) {} {:a 0 :b 1 :c 3}))
12:01	hellofunk	amalloy: since both maps will always have same keys, select-keys is probably unnecessary?
12:01	clojurebot	{:c 3}
12:01	amalloy	oh, same keys
12:02	amalloy	then sure
12:02	sdegutis	I am finding it difficult to get started with a sample of Instagram.
12:02	sdegutis	Thanks in advance.
12:02	hellofunk	amalloy wins
12:02	sdegutis	I mean Instaparse.
12:02	crocket	Why does clojure say "clojure.lang.Symbol cannot be cast to clojure.lang.IPersistentVector" when it compiles https://www.refheap.com/106630 ?
12:02	amalloy	(into {} (remove (set m1) m2))
12:02	hellofunk	amalloy: totally awesome. i knew it was out there
12:02	hellofunk	(inc amalloy)
12:02	amalloy	,(disj {1 2} [3 4])
12:02	lazybot	⇒ 287
12:02	clojurebot	#error {\n :cause "clojure.lang.PersistentArrayMap cannot be cast to clojure.lang.IPersistentSet"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.PersistentArrayMap cannot be cast to clojure.lang.IPersistentSet"\n :at [clojure.core$disj invoke "core.clj" 1452]}]\n :trace\n [[clojure.core$disj invoke "core.clj" 1452]\n [sandbox$eval101 invoke "NO_SOURCE_FILE" 0]\n [cloj...
12:03	hellofunk	amalloy: funny how three of us had these paragraph-long ideas. if there's one thing 4clojure has taught me, there is almost always a simple expression for stuff like this
12:04	wasamasa	sdegutis: well, it requires you to already know the theory behind parsing
12:04	sdegutis	Thank you.
12:04	wasamasa	sdegutis: perhaps you find it easier to get into https://github.com/youngnh/parsatron
12:04	crocket	Help
12:05	sdegutis	I have a simple INI file.
12:05	sdegutis	Please if you know how these two libraries compare in terms of community mentality.
12:05	crocket	Ah...
12:05	sdegutis	wasamasa: Thank you in advance, best regards.
12:06	wasamasa	sdegutis: the former does a lot more than the latter
12:06	wasamasa	sdegutis: basically it supports every approach to parsing you'd encounter in the wild
12:06	sdegutis	wasamasa: I only need to parse a simple INI format. So it sounds like the latter might be suitable. However if it is completely terrible, and everybody hates it, that might be a problem.
12:06	wasamasa	sdegutis: while the latter does recursive-descent parser combinators only
12:06	crocket	I should surround an anonymous function in parentheses in ->
12:07	sdegutis	I admire that it uses ClojureScript however this is not a feature I have absolutely any need for. So if this is the primary target of this library then we have differing philosophies and thus should part ways.
12:07	sdegutis	Thank you.
12:08	wasamasa	wat
12:08	wasamasa	could you please drop this superfluous speak, this isn't email
12:09	wasamasa	asides from that, I find it very hard to believe there's no existing library for parsing ini files: https://clojars.org/search?q=ini
12:09	sdegutis	I do not really have an INI file, it is very similar though. It is a custom text based format that we employ and which is very similar to INI format and simply has a defined text-based format.
12:10	sdegutis	It has a simple specification, mostly using newlines for delimiters, but at one well-defined point also using brackets.
12:10	sdegutis	Our CEO asked me originally to just use an Excel file as the format but I had to explain why this was not an appropriate idea.
12:12	sdegutis	It might even be simple enough to use simple Clojure sequence processing to transform it. However this is not strictly a good idea and thus I want to use some technique and/or methodology that is quite a bit more appropriate.
12:12	sdegutis	However that is why I have considered Instaparse and now Parsatron.
12:12	sdegutis	Thank you for your advice and continued help.
12:13	wasamasa	have fun learning parsing theory then
12:13	sdegutis	This person suggests that Parsatron is dead: https://twitter.com/kurisuwhyte/status/382699042938974208
12:13	wasamasa	suuure
12:14	wasamasa	that must be why I had to extend its grammar for a work project
12:14	sdegutis	That does make sense.
12:15	sdegutis	wasamasa: I may be able to come up with an EBNF grammar, will that suffice for this?
12:15	sdegutis	Thanks in advance.
12:17	wasamasa	sdegutis: if you get it perfectly right the first time, yes
12:19	sdegutis	Thank you.
12:24	sdegutis	How do you specify "any alphanumeric, punctuation, or whitespace character except newline"?
12:24	sdegutis	In other words "any printable character except newline" in Instaparse?
12:25	blkcat	have you considered using a regex?
12:28	wasamasa	lol, you write parsers because you're doing something better than merely using regex
12:28	wasamasa	anyhow, I'm out as this is as far as my knowledge on the topic goes
12:28	blkcat	haha, that's fair :P
12:37	sdegutis	blkcat: that might be appropriate
12:37	Shayanjm	Does anyone here have implementation experience in quantum computing?
12:39	sdegutis	I don't think that's a real thing yet.
12:39	sdegutis	I think it's mostly theoretical.
12:39	justin_smith	Shayanjm: gfredericks has done some qc related projects
12:39	Shayanjm	sdegutis: nah there are tons of quantum simulators
12:39	sdegutis	Oh.
12:40	justin_smith	Shayanjm: simulator related, of course
12:40	sdegutis	Brb writing Clojure instead of Haskell or JavaScript.
12:40	Shayanjm	justin_smith: great, thanks. I'm trying to build my own simulator on clj
12:40	tolstoy	Is there a way to make lein use the latest clojure when running outside a project context?
12:40	Shayanjm	@ gfredericks - would love to pick your brain a little bit when you have a moment
12:40	justin_smith	Shayanjm: yeah, you could probably start with one of his
12:40	tolstoy	Corollary: Is leiningen ever going to be updated?
12:41	Shayanjm	justin_smith: creeping his site, checking out his quantum circuit visualization. Looks really cool
12:43	sdegutis	I am attempting the following: Str = #'\\w\|\\W'+
12:43	sdegutis	Please advice.
12:45	sdegutis	Anyone here prefer Boot over Lein?
12:48	puredanger	they serve different users imo - for a basic Clojure project, lein is going to satisfy most of your needs for a long while
12:48	justin_smith	puredanger: who do you see as the target demographic for boot?
12:48	puredanger	boot is better the more customization you have to do, particularly intermediate file generation type tasks
12:48	puredanger	most cljs builds can probably benefit from it (I think) and more advanced large-project builds
12:49	rhg135	puredanger is correct. I do my plain clj in lein
12:50	gfredericks	Shayanjm: what's up?
12:50	hiredman	I disagree
12:50	puredanger	I'd love to hear your opinion
12:52	rhg135	Simpler cljs builds are fine with figwheel imo
12:52	hiredman	generally, builds are terrible, and javascript builds (for whatever reason) are the worst
12:52	puredanger	I think the other thing is that lein comes at the problem from the "declarative project model / lifecycle" perspective (like Maven) and boot comes more from an imperative "task" perspective - assembling pipelines of things that are useful for your particular build.
12:53	puredanger	those might fit different projects and people differently
12:53	cfleming	I agree that the more complicated the build, the more flexible something like boot will end up being.
12:53	hiredman	people generally react to that by calling for more tooling, I've already seen people calling for tooling above and beyond boot for wiring together all the cljs build parts
12:53	hiredman	but the tooling is more strata to dig through when it breaks
12:54	hiredman	it is terrible
12:54	sdegutis	I am successfully using Instagram to parse my text file format.
12:54	rhg135	I'm hoping for a lein update soon
12:55	rhg135	I like my 1.7
12:56	sdegutis	Is Clojure 1.7 released then?
12:56	rhg135	Yeah
12:57	hiredman	boot may or may not be good, but I think it's adoption is driven by an need to escape the terribleness of ui builds and a willingness to try anything to do that, without much reflection about if a solution actually solved anything
12:59	rhg135	It's better than writing dozens of shell scripts
12:59	puredanger	I'm looking at it for stuff that has nothing to do with ui and there many things I like about it
12:59	hiredman	the same impluse behind all the javascript build tools that make it impossible to get a node project up and running from source
13:00	sdegutis	I had to add this rule: Str = #'.+'
13:01	rhg135	It'd be useful for post/pre processing
13:01	rhg135	Like js gen or dexing
13:04	sdegutis	puredanger: Thanks for the comprehensive analysis and comparison of Boot vs Lein. I appreciate it. And it seems very accurate and compatible with my own experience using both and reading their documentations.
13:05	puredanger	my opinions are still forming on it, so for sure, do your own analysis
13:06	sdegutis	My understanding is that Lein + a few mainstream plugins are what most Clojure people will use, since they share the common mentality of wanting to as much as possible in Clojure, and letting other libraries and plugins help them with the common cases, such as building dependencies, uploading to EC2, etc.
13:06	sdegutis	And that Boot is a reaction to this, to try simplifying it when you want more flexibility in any of these steps, which currently is a headache involving creating custom Lein plugins etc.
13:07	sdegutis	I am a fan of neither and would prefer to just use GNU Make.
13:07	sdegutis	But alas we're in the Java world here.
13:07	puredanger	sdegutis: you might want to look at cmma
13:07	puredanger	https://github.com/ohpauleez/cmma/
13:07	puredanger	Paul uses it pretty extensively to manage Clojure apps with make
13:08	sdegutis	Its README's rhetoric is too vague: cannot tell what it does, and how it's different than anything else.
13:08	puredanger	it uses make to manage Clojure projects
13:08	sdegutis	Oh!
13:08	puredanger	it wraps other build systems (lein, boot, etc) to steal the dep-mgmt parts
13:09	sdegutis	Ahh crap.
13:09	sdegutis	Implies: So many JVMs starting and stopping constantly.
13:10	puredanger	mmm, don't think so? once you grab jars, you have them. no need to do that on every build.
13:10	sdegutis	Every `lein run` rebuilds my Clj source and runs it.
13:10	sdegutis	That's where this would come in.
13:14	slester	Hello hello; I'm sure this channel gets this question frequently, but since I can't use Clojure at work, I'm looking for a project (pref. GPL) to work on. Any suggestions? Sometimes it's a bit opaque how to get started in a community
13:15	justin_smith	slester: is epl good enough? there isn't much gpl clojure
13:15	justin_smith	but there is a lot of epl clojure
13:16	justin_smith	slester: the leiningen project has a tag for issues that would be easy for a newcomer to work on in their github issue tracker
13:17	justin_smith	It's EPL
13:17	sdegutis	Is there a better way to write (fn [s & _] s) ?
13:17	justin_smith	first
13:17	justin_smith	well, no, not first
13:17	justin_smith	(comp first list)
13:18	justin_smith	,((comp first list) :a :b :c :d :e)
13:18	sdegutis	I tried `first` at first.
13:18	clojurebot	:a
13:18	sdegutis	justin_smith: Thanks. Which way do you think is clearer?
13:19	justin_smith	sdegutis: probably your version
13:19	justin_smith	sdegutis: also (apply (comp first list) (range)) goes into a loop, (apply (fn [s & _] s) (range)) returns 0 immediately
13:20	TMA	sdegutis: if you need a name, in common lisp this function is called prog1
13:20	sdegutis	TMA: Thank you. That fully solidifies my distaste for CL.
13:21	justin_smith	clearly program-one is the right name for it
13:22	TMA	sdegutis: maybe you shall restructure the solution to avoid the need for such a distasteful function :)
13:22	slester	justin_smith: whoa, thanks, for some reason my IRC client/internet connection just sent me 20 messages at once
13:23	justin_smith	slester: yeah, the IRC protocol is kind of weird, things like this are not uncommon
13:23	slester	justin_smith: and yep, EPL is fine.
13:23	slester	justin_smith: leiningen seems kind of massive, I'll have a look through its issues though. I do like it a lot and would like to help.
13:24	justin_smith	another bonus to working on leiningen is that nearly all of us use it
13:24	justin_smith	which amplifies the warm-fuzzies of contribution
13:24	slester	a very important part of contribution, if often not spoken of :)
13:24	sdegutis	TMA: I am interfacing with Instaparse. It is impossible to rework anything.
13:25	sdegutis	Oops. It's actually (fn [s _] s) that I wanted to investigate replacing.
13:25	sdegutis	It's a two-argument thingy.
13:26	sdegutis	Actually, wait. Is it possible to just tell Instaparse to omit a certain thing from the output tree?
13:26	sdegutis	I have a literal '\n' in my rule (to indicate end of line as the terminator for that rule). But it keeps emitting this stupid character in my output tree.
13:27	TimMc	slester: lein has some issues marked "newbie" which don't require as much background
13:27	justin_smith	TimMc: yeah, that's why I brought it up
13:27	sdegutis	Anyone know if this is possible somehow?
13:27	sdegutis	To tell it "hey don't omit this character in my rule"?
13:28	xemdetia	sdegutis, did you look at 'transform'
13:28	sdegutis	I am currently using it.
13:29	sdegutis	That's where I'm putting (fn [s _] s)
13:30	sdegutis	One way would be to give a name to my Newline character and then transform it into nil in the transform, if that even works. But that might not work. And even if it does, I don't want to name Newline.
13:30	xemdetia	can't you just do :newline-token nil
13:30	xemdetia	well it is a token in your input stream?
13:30	sdegutis	xemdetia: It's a literal '\n'
13:30	xemdetia	since you are using it as a meaningful delimiter instead of whitespace?
13:31	sdegutis	Entry = Thing+ '\\n'
13:31	xemdetia	so for the grammar to accept the input it must have a literal newline token
13:31	xemdetia	so it makes sense it would be in your output
13:32	sdegutis	Not with how well-structured Instaparse's output tree already is.
13:32	sdegutis	I don't need the newline in my output, it's just there for the sake of the parser. Now that it's parsed, I don't need this token anymore.
13:33	xemdetia	so tag it as a token and do a tree transform to get rid of it, that's really the answer if you are not able to override how the newline token is added to the tree
13:33	xemdetia	this is more general parser theory than exactly instaparse
13:36	sdegutis	Oh.
13:36	sdegutis	Thanks xemdetia for your expert help.
13:36	xemdetia	accepting a grammar in a parser is one job, the data structure it emits as a representation is a separate part, if the path between lexer and tree is a black box to you
13:36	xemdetia	you just have to deal with it on the output side
13:37	sdegutis	Most excellent.
13:38	sdegutis	Transforming it into `nil` does not help.
13:38	sdegutis	It is still present, only now as nil.
13:38	sdegutis	(hehehehehheh)
13:39	justin_smith	sounds like a job for mapcat
13:40	xemdetia	only when you need mapcat to be
13:40	xemdetia	during the day mapcat is just cat, a noble blue collar worker
13:40	xemdetia	taking files from over there and dumping them to screens for the luxurious
13:40	xemdetia	but at night
13:40	xemdetia	mapcat gets lispy
13:40	justin_smith	haha
13:40	justin_smith	(doc cat)
13:40	clojurebot	"([rf]); A transducer which concatenates the contents of each input, which must be a collection, into the reduction."
13:42	xemdetia	sdegutis, will nil be happily handled by the reader of that tree
13:42	xemdetia	if not maybe you just have to do some dissoc/remove-keys magic
13:42	sdegutis	xemdetia: no, it still requires me to use (fn [s _] s)
13:43	xemdetia	well I didn't mean through instaparse transfor
13:43	xemdetia	just use it like a tree
13:43	sdegutis	It ends up inside a ["mystring" "\n"], where I ultimately just want to get "mystring" out.
13:44	xemdetia	I mean you have a ref to a map that is your output, just use it like a map? filter maybe?
13:44	xemdetia	I am not remembering how instaparse emits
13:44	xemdetia	been playing with antlr more lately
13:45	sdegutis	How do you match the very end of a file?
13:45	sdegutis	Should I just append \0 to the file and match for that?
13:47	xemdetia	we're talking about a few different things? when/how do you want to match the eof?
13:48	xemdetia	I mean from lexer/parser land usually you just invent an eof token so you don't have to worry about it
13:48	sdegutis	Pretend that, in the file my professor will give us, there may not be a trailing newline at the end of the file, whereas it belongs to a repeating rule.
13:49	sdegutis	For example if Line was a rule to match a line and ends in '\n', and you might have many lines, but the last one doesn't end in a newline.
13:49	sdegutis	Does this make sense?
13:49	snowell	sdegutis: You can use brackets to exclude it from the output: Entry = Thing <'\n'>?
13:49	sdegutis	snowell: Awesome!!!
13:50	sdegutis	Let me try.
13:50	sdegutis	Ahhh: "Angle brackets on the right-hand side of a rule correspond to the hide combinator."
13:50	sdegutis	I did not look for "hide" anywhere ever. Only "ignore" and "omit".
13:56	sdegutis	Yes, <> works perfect. To ignore the token itself but leave the rule name, I put it on the right side. To ignore both, I put it on both sides.
13:56	sdegutis	I never even saw the "Controlling the tree structure" section! This is useful.
13:56	xemdetia	sorry, haven't used instaparse enough
13:57	xemdetia	but yeah there is a separation between 'accept grammar' and 'data structure'
13:57	xemdetia	you either have hooks or you don't
14:06	sdegutis	So if you have a file with multiple Lines, each Line ending in '\n', but the last line omits the newline -- how do you express this?
14:06	sdegutis	Or do you just add an \n at the end of the file just in case, ignoring a second \n that might be at the end?
14:08	xemdetia	sdegutis, one way could just accept '\n'+
14:08	sdegutis	xemdetia: But it might have 0 newlines on the last line
14:09	xemdetia	or I might have misread it
14:09	sdegutis	And * doesn't work since every line before it requires at least one
14:09	snowell	? translates to 0 or 1
14:09	sdegutis	It's a text file where each line is an entry, but the whole file might not end with a newline
14:09	xemdetia	right, are you slurping the input file directly into instaparse or are you buffering it first
14:09	sdegutis	(slurp)
14:10	sdegutis	(->> file (slurp) (parse))
14:10	xemdetia	can you just stick an extra newline on the end? _
14:10	sdegutis	Yep. That's my current plan.
14:10	snowell	I would use ?
14:10	xemdetia	he can't
14:10	sdegutis	But it makes me feel dirty.
14:10	xemdetia	newline is a meaningful character
14:10	hellofunk	cljs repl experiments by mfikes are trending high on HN right now
14:11	sdegutis	(inc mfikes)
14:11	lazybot	⇒ 1
14:11	xemdetia	sdegutis, its not really dirty. massaging input before lexing is just something you have to do
14:11	sdegutis	It's a thing?
14:11	sdegutis	Phew.
14:11	sdegutis	xemdetia++
14:11	xemdetia	well I mean in most of my grammars I have an end of input thing
14:12	xemdetia	and usually that is something I glue in lexer - EOF APPEND - parser
14:12	xemdetia	if it is not convenient to do another way
14:13	snowell	You could parse with a regex
14:13	justizin	anyone using clojure to test existing java code with no coverage?
14:13	snowell	sdegutis: Entry = Thing + <#
14:13	snowell	bah
14:14	hiredman	justizin: yes
14:14	snowell	Entry = Thing + <#"[\n\|\Z]">
14:14	sdegutis	xemdetia: I've done that too in the past -- my lexer would append a special :EOF token to the end of the token stream.
14:14	sdegutis	xemdetia: But Instaparse is fun.'
14:14	snowell	That will match on \n or end of string
14:14	hiredman	well, maybe "that depends"
14:14	xemdetia	that's true
14:15	xemdetia	but yeah just throwing an eof on the token string is easiest
14:15	xemdetia	because then you aren't relying on some condition of the input to be exactly right
14:15	xemdetia	which makes debugging easier
14:15	snowell	Easiest, sure. But like sdegutis I feel dirty doing something like that :D
14:16	xemdetia	well
14:17	xemdetia	this is why using whitespace as a delimiter is awkward
14:17	xemdetia	if you used semis for every line you wouldn't have this problem at all
14:17	xemdetia	and you would have a clean token string to feed the parser
14:17	sdegutis	+1
14:17	snowell	Of course then a user comes along and puts a semi in the input
14:18	sdegutis	xemdetia: the real problem is having to parse something that humans edited
14:18	xemdetia	yes
14:18	justizin	hiredman: any tips on where to start? examples?
14:18	sdegutis	*and assembled
14:18	xemdetia	the real problem is the people
14:18	xemdetia	remove the people
14:18	sdegutis	OF COURSE
14:18	sdegutis	ROBOTICIZE THIS JOB
14:18	sdegutis	how could i not think of this
14:18	sdegutis	Welp, at least I'm not parsing Excel files.
14:19	slester	this is how the robot wars begin
14:19	hiredman	justizin: the first thing you'll need to figure out is how to tie the clojure tests in to your java project, the easiest way to do that is to build the java project using lein, then you can run with tests with `lein test` and write them using clojure.test
14:20	hiredman	if you can't do that you can look at clojure, it is a java and clojure project, built using maven, tested in clojure
14:21	sdegutis	Thanks in advance, regards.
14:21	justizin	hiredman: tks
14:22	sdegutis	My awful hacky solution: https://gist.github.com/sdegutis/7ca83a4a4a61b7ced970
14:22	sdegutis	Passes all tests!
14:22	sdegutis	And now I'm done 3 hours early.
14:22	sdegutis	Time to convert Sass to Stylus.
14:23	sdegutis	I really want to convert it to Clj to be honest. But let's face it JVM startup time won't be acceptable for 15 more years.
14:24	justizin	hiredman: somehow this idea came out of the thought of using lein instead of maven
14:24	justizin	i have a little experience with lein from working with jepsen and LightTable
14:25	hiredman	sure, lein does well building java, and then you can point test.check at your java, it is great
14:25	justizin	sweet
14:25	justizin	it feels like it might be less typing to write lots of new tests of a java module with clojure
14:26	bauhaus	anyone seen a deps error in the latest version of datomic: I/O exception caught when processing request to {}->http://jline.sourceforge.net:80: Connection reset >.<
14:28	sdegutis	We are very far behind in Datomic versions. Years old.
14:29	sdegutis	Also in Clojure version.
14:29	sdegutis	We can't update. Too expensive.
14:30	bauhaus	thought the sourceforge ship had sunk
14:31	bauhaus	guess not
14:31	sdegutis	bauhaus: yes it has
14:31	bja	just submitted a PR to a project that introduces eval, preparing to get roasted...
14:34	wasamasa	for what reason?
14:34	wasamasa	inb4 it's in a macro
14:38	bja	I'm generating destructure arguments and have a macro that does let passing those bindings in (manual-let), I need to eval the result of that along with the symbols I want out
14:38	bja	at least as far as I can tell
14:39	bja	so the macro builds a let*, then I want to eval it so I can grab the result of the destructuring
14:39	justizin	hiredman: any examples of java projects built with lein? the documentation is all like 'clojure clojure clojure'
14:39	bja	https://github.com/stuartsierra/component/pull/37/files#diff-998bb67cf5bc59512267d4e162873450R137
14:40	hiredman	https://github.com/sonian/Greenmail/blob/master/project.clj
14:40	bja	justizin: storm used to be built with lein, but it's moved to straight maven during the 0.9 cycle
14:43	wasamasa	bja: can I get a cookie for guessing right?
14:43	bja	well, the eval isnt' in a macro
14:44	bja	but I guess you can have a cookie anyway, since it's pretty close
14:44	wasamasa	yay
14:45	bja	(inc wasamasa)
14:45	lazybot	⇒ 1
14:56	sdegutis	Is there a nice way to prettily diff two not-too-deep maps. Thanks?
14:56	H4ns	sdegutis: https://clojuredocs.org/clojure.data/diff
14:58	H4ns	minus the "nice" and "pretty", i fear
14:58	sdegutis	Sorry I mean to print.
14:59	snowell	,(doc prn)
14:59	clojurebot	"([& more]); Same as pr followed by (newline). Observes flush-on-newline"
14:59	snowell	sdegutis: ^
15:00	sdegutis	snowell: Thanks. I fear prn does not work well for many vectors.
15:01	snowell	Well you said they weren't too deep. pr-str / pr / prn are about as pretty as you can print
15:02	snowell	You could try clojure.pprint/pprint I suppose
15:03	xemdetia	you could print to legal and get out some highlighters
15:03	xemdetia	I think I still have some stickers in a drawer somewhere
15:21	atyz	Does anyone know where I can find information on how to efficiently query nested entities (of the same type, they all have the same ref - like a tree) in datomic?
15:41	iwillig	atyz: you might want to try the datomic channel
15:41	iwillig	but would the pull api be enough for you ?
15:41	fredfe	Is net.mikera/core.matrix a prefered/stable matrix match lib?
15:59	gfredericks	sdegutis: the puget library might be useful
16:09	hcumberdale	Hi! :)
16:09	hcumberdale	How to register a log4j.properties file during a lein plugin execution ?
16:10	hcumberdale	Files under ./resources does not seem to be seen during plugin execution
16:21	nicola	i'm having a similar issue - my (clojure) code uses cassandra which logs A LOT of stuff on the console; is there a simple way to turn it off?
16:24	hcumberdale	nicola: generally you can set things via resources/log4j.properties
16:24	hcumberdale	but this isn't recogniced during a plugin run
16:24	nicola	i'll try that, thanks
16:27	justin_smith	nicola: another option is to use lein repl in the console, which will start a repl and also start listening on a port, then you can use 'lein repl connect' in another terminal. The logging goes to the first one, and will not interrupt your work in the second.
16:27	justin_smith	in place of lein repl :connect, you can also use a client like cider of course
16:28	nicola	hcumberdale: didn't seem to work :( still logs a lot of stuff
16:29	hcumberdale	nicola: depends on what logging framework loggs this stuff.
16:29	nicola	justin_smith: by console i meant stdout, not repl/cider
16:29	nicola	hcumberdale: i'm pretty sure it's log4j (at least from looking at cassandra's source code) but i'm still trying to sort this out so i might be wrong
16:29	justin_smith	nicola: then explicitly open a file handle and output to that instead of using stdout?
16:29	hcumberdale	nicola: what is writing to stdout? A framework? Yur application
16:30	hcumberdale	nicola: it might be java commons logging
16:30	nicola	i'm calling some function from cassandra; these functions in turn log a bunch of stuff to stdout, which i don't want
16:30	justin_smith	nicola: that would be the hack version at least. if you figure out what logger it is using, you can configure that logger of course.
16:30	hcumberdale	you can bundle all logs into a slf4j adapter
16:30	hcumberdale	see: https://github.com/kremers/clojurewebtemplate/blob/master/project.clj << logging
16:31	hcumberdale	it is using logback as backend
16:31	justin_smith	nicola: what is consuming your stdout?
16:31	hcumberdale	configured here: https://github.com/kremers/clojurewebtemplate/blob/master/src/logback.xml
16:32	hcumberdale	nicola: the java driver for cassandra is using slf4j
16:33	nicola	justin_smith: i'm just printing to console; i mean lein uberjar, then java -jar target/...-standalone.jar; i'm not piping this to anything
16:33	nicola	hcumberdale: oh interesting
16:35	justin_smith	nicola: the reason I ask, is if nothing is programatically consuming it in real time, you can even just use something like grep
16:35	nicola	justin_smith: oh i see; i'd want to take it out anyway though
16:36	justin_smith	clearly a misunderstood a few things, heh
16:40	nicola	YES! here's the solution (set to only warnings) (.setLevel (org.slf4j.LoggerFactory/getLogger ch.qos.logback.classic.Logger/ROOT_LOGGER_NAME ) ch.qos.logback.classic.Level/WARN)
16:40	nicola	thanks for the tip about slf4j hcumberdale
16:41	hcumberdale	nicola: better you use a file. So you are able to adjust it later without redeployment etc.
16:42	nicola	true
16:49	hcumberdale	hmmm technomancy not here
16:51	slester	Just read this on HN: "Slow launch means you tend to write monolithic applications. You can't write cli tools with Clojure. You can't compose Clojure applications. You have to write a big bulky JVM app. Which definitely has its place, but ClojureScript is expanding Clojure's reach." -- Is that true? I mean the repl does take forever to start, but does that inhibit CLI?
16:54	hiredman	it is ridiculous
16:54	hiredman	my ~/src has 18 shebang scripts written in clojure in it
16:55	blkcat	the jvm startup time is not what i would call ideal
16:55	hiredman	(counted via find $PWD -name \*.clj -exec head -1 {} \;\|grep '#!'\|grep jar\|wc -l)
16:55	blkcat	just getting usage from lein takes a little under 4 seconds on my system
16:56	hiredman	the shebang lines for those 18 files are some variation of #!/usr/bin/java -jar /Users/hiredman/src/clojure/target/clojure-1.7.0-master-SNAPSHOT.jar
16:56	justin_smith	blkcat: the lein repl startup time is not caused by the jvm, the culprits are mainly nrepl, lein, and clojure.core, in that order last I checked
16:57	justin_smith	if you can avoid the lein and nrepl parts of the equation, you'll like your startup time much more
16:57	slester	hiredman: and I guess the responsiveness is fast?
16:57	slester	I searched and found https://en.wikibooks.org/wiki/Clojure_Programming/Tutorials_and_Tips#Shebang_Scripting_in_Clojure
16:59	hiredman	I have no idea, they are not interactive, there is one to delete old clojurebot postgres backups from s3, one to launch the daily show on my roku, one to generate a youtube playlist from the gist of songs played in the strange loop main hall
17:00	hiredman	I've never cared, or used time on them, and they work great
17:00	puredanger	I can run this in 0.893 sec: time java -cp clojure.jar clojure.main -e "(+ 1 1)"
17:00	puredanger	which starts a repl, evaluates an expr and shuts down
17:00	slester	hiredman: launch the daily show on your roku? :O
17:00	puredanger	well I guess starts a runtime, not a repl
17:01	hiredman	slester: sure, that script is retired, replaced by a little web app that I used from phone, and then I moved and never set it up again
17:03	hiredman	the webapp was sweet, I ran it on a beaglebone and could use it to drive my tv, roku, even the fireplace
17:04	hiredman	I touching a single button it would turn on the tv, set it to right input, then launch the hulu roku app, search of the daily show, then launch the most recent episode
17:05	hiredman	I do a lot of stuff, and I do with clojure, and it works great
17:07	hiredman	https://gist.github.com/hiredman/7682917
17:08	vas	hiredman; that's impressive.
17:11	csd_	does there exist some macro that makes it easy to thread a async channel through a stateful series of functions for testing purposes? is this even a good practice to consider?
17:26	adrians	Anyone around who is using Emacs/cider and who could answer a few questions?
17:27	mk	adrians: best way to find out is to just ask :)
17:29	Seylerius	adrians: I'm not massively experienced, but I'm using CIDER atm and could experiment. Speak your queries.''
17:37	adrians	for some reason I don't seem to be getting the doc popup in my editor buffer when using cider/company-mode, but I do have it in my cider-repl buffer - same minor modes seem to be in effect for both buffers
17:42	adrians	Would anyone know what I should look for to determine why I'm not getting the help popup in the editor?
17:45	adrians	Seylerius, mk: still around?
17:45	Seylerius	adrians: Yep.
17:46	adrians	Any suggestion?
17:46	mk	yes, but I don't use either of those
17:46	Seylerius	adrians: Which help popup?
17:46	adrians	one that comes up after the auto completion popup appears
17:54	Seylerius	adrians: The one that's supposed to provide the argument possibilities?
17:56	adrians	Seylerius: the package is called company-quickhelp
17:56	Seylerius	Ah, that one.
17:56	adrians	it shows the function signature plus the doc string
17:56	adrians	is this meant to work only in the repl buffer?
17:56	arrdem	there's also eldoc-mode
17:57	adrians	arrdem: yes, I'm using that too, but I like the multi-line popup in addition to that
17:57	arrdem	and no both will work fine in both code and the repl
17:58	arrdem	assuming you're in cider-mode with a live connection among other things
17:58	adrians	aardem: so what could be a reason not to see it in a regular editor?
17:58	adrians	aardem: I am connected - I get the popup in the repl buffer
17:59	adrians	and on the github page, I see no configuration other than for turning it on and setting the delay
17:59	arrdem	so you have to hook company-quickhelp-mode to cider-mode
17:59	arrdem	or turn it on yourself
17:59	arrdem	I don't think cider does that automagically
18:00	arrdem	that's something I think got added to the README recently along with adding company-mode to cider-mode. if not then it needs to be in the README
18:02	arrdem	adrians: did/does that help?
18:02	adrians	yes, thanks aardem
18:16	broma0	a good data structure for O(1) push/pop at both the front and back?
18:20	arrdem	broma0: doubly linked list
18:20	arrdem	not immutable tho.
18:21	arrdem	finger trees may be able to do that as well, but they're gonna be O(log32(n)) push/pop
18:21	amalloy	i think the main persistent options are finger trees and RRB trees
18:21	amalloy	arrdem: really? i know that's true of RRB trees, but i don't think finger trees have and kind of 32-wide branching
18:21	arrdem	amalloy: I don't remember the specifics of finger trees, maybe I have them confused with vectors
18:21	arrdem	s/maybe/probably/g
18:22	amalloy	i think so. RRB trees are the thing bagwell gave a talk about, as a way to improve clojure's vectors
18:22	arrdem	heh
18:24	hcumberdale	How to enable the log4j debug logger on root level when executing leiningen plugins
18:38	broma0	arrdem: amalloy: Thank you
18:39	TEttinger	gfredericks: I have some RNG puzzling to do that perhaps you are already an expert on
18:39	TEttinger	gfredericks: I'm interested in implementing the PCG family of RNGs in Java (making them usable to Clojure as well, of course)
18:40	TEttinger	http://www.pcg-random.org/
18:43	TEttinger	they're a very conceptually simple modification on a linear congruential generator (or multiplicative congruential generator, which is what I'm interested in) where they use the values in the low-period low bits as shift or rotation operands, and/or use them to perform a xorshift on the high bits of the LCG output
18:45	TEttinger	downside is I need a better LCG than Java's, since java will only produce 32 bits with a period of 2^48, and there aren't nearly enough bits to work with there
19:03	crocket	Can anyone recommend a good command line parser?
19:04	Surgo	tools.cli
19:04	Surgo	https://github.com/clojure/tools.cli
19:04	Surgo	your definition of good may vary
19:05	crocket	Is tools.cli simple and small?
19:05	Surgo	simple, you can decide on that yourself by checking the readme
19:06	Surgo	small, it has no dependencies aside from clojure
20:57	jhn	if I have a set of maps, how can I test if there is some key in any of the maps that has a particular value?
20:59	scriptor	,(map #(contains? % :key) [[:key 1] [:bar 2]])
20:59	clojurebot	(false false)
20:59	scriptor	sorry
20:59	scriptor	,(map #(contains? % :key) [{:key 1} {:bar 2}])
20:59	clojurebot	(true false)
21:03	jhn	ty
21:16	julianleviston	um
21:17	julianleviston	that’s not going to test if there’s a key that has some particular value… unless you mean “how can I test that the map has a particular key”? which wasn’t what you asked.
21:18	julianleviston	jhn Precision of language: This is a set of maps: #{{:a 1} {:b 2}} is this what you meant when you said “if I have a set of maps”?
21:19	jhn	julianleviston Yes, I noticed, but that gave me the hint as to what I could do.
21:19	jhn	And yes, I meant an actual set.
21:21	julianleviston	good o
21:23	gfredericks	TEttinger: was there a question associated with that?
21:24	TEttinger	gfredericks: ah I assumed you weren't around and it was going to get passed out of history
21:25	TEttinger	gfredericks: are you familiar with L'Ecuyer's LCG constants?
21:26	TEttinger	I was having a hard time understanding why he claims certain numbers for MCGs produce reversed-order generators compared to certain other numbers, and I think I don't understand his meaning
21:26	gfredericks	it doesn't sound familiar
21:26	TEttinger	http://www.ams.org/journals/mcom/1999-68-225/S0025-5718-99-00996-5/S0025-5718-99-00996-5.pdf
21:26	gfredericks	the most I looked into LCGs was to read the knuth volume without doing any of the exercises
21:27	TEttinger	I gotta say I still haven't finished watching your splittable RNG talk :(
21:27	TEttinger	it was starting to go over my head when I stopped
21:27	TEttinger	I did look into Java 8' SplittableRandom source
21:28	TEttinger	http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8-b132/java/util/SplittableRandom.java
21:28	gfredericks	what part was head-over? the algorithm descriptions?
21:28	gfredericks	yeah I looked at that file quite a lot :)
21:28	TEttinger	I can't remember, I don't understand the threading stuff that well
21:28	TEttinger	why you would want splittability, I mean
21:28	gfredericks	oh there are different reasons
21:28	gfredericks	doesn't have to be threading
21:29	gfredericks	e.g. test.check more or less needs it and is single-threaded
21:29	TEttinger	ah
21:29	gfredericks	laziness is the key factor in the test.check case
21:29	gfredericks	but the biggest reason is just that the state monad is a giant pain
21:29	gfredericks	especially if the haskell compiler is not holding your hand
21:29	TEttinger	hm.
21:30	gfredericks	so if you want to write complex deterministic programs that depend on pseudorandomness, you can't give them an arbitrary structure, you have to manually linearize the program
21:30	gfredericks	I will admit this probably doesn't matter for most people
21:31	TEttinger	I think I can implement PCG-Random's bit-fiddling over any 64-bit-state, 64-bit-output generator and get a 32-bit generator out of it
21:31	gfredericks	if you're using a haskellesque language though, the language forces this to be important
21:32	TEttinger	gfredericks, are you using SplittableRandom now or your own RNG?
21:32	TEttinger	(in test.check)
21:32	gfredericks	I ported it to clojure
21:32	TEttinger	ah!
21:32	gfredericks	SplittableRandom is OOP style
21:32	gfredericks	the port is clojure/functional style
21:32	TEttinger	cool
21:32	gfredericks	but it gives you identical results
21:33	TEttinger	can you skip ahead?
21:33	TEttinger	(efficiently?)
21:33	gfredericks	I don't think there's a need to?
21:33	gfredericks	I'd be curious to hear a use for that
21:33	gfredericks	that can't be met by general splittability
21:33	gfredericks	(you might still be able to, I just haven't thought about it)
21:34	TEttinger	eh, it's sometimes a handy feature. you can do it regardless of having been split, so it could be added onto a SplitMix style RNG
21:35	TEttinger	you could have a decent-sized collection of SplitMix RNGs, right? each has tiny state so having lots isn't a problem
21:36	julianleviston	is there a flip combinator in clojure?
21:36	gfredericks	I'm not sure what splitmix means exactly
21:36	TEttinger	gfredericks: it's the type of generator SplittableRandom uses
21:36	gfredericks	oh that sounds familiar
21:36	gfredericks	the "skipping ahead" question doesn't actually fit well with the API I aimed at because it's not linear at all
21:36	gfredericks	there is no inherent "sequence of numbers" to skip ahead in
21:37	gfredericks	though the SplittableRandom algorithm is more sequence-like
21:37	gfredericks	I just decided to more or less ignore that sequence
21:37	TEttinger	they could all be seeded with the same state. the update step for SplittableRandom adds the gamma to state, then takes that value (not modifying state anymore) and xorshifts/multiplies it some
21:38	TEttinger	it's fairly straightforward to add gamma many times and only get the overflow out of it
21:38	gfredericks	oh yes, that's right
21:38	TEttinger	that would be equivalent to skipping ahead
21:38	gfredericks	yep
21:39	gfredericks	f(state + gamma * n)
21:39	TEttinger	yes, but not quite
21:40	gfredericks	eh?
21:40	TEttinger	if you wanted to skip ahead 1000 iterations, will that be OK with regards to overflow?
21:40	TEttinger	hm, to the clojurebot
21:40	gfredericks	I believe the unchecked jvm arithmetic ops Just Work
21:40	gfredericks	you just want to do modular arithmetic
21:41	TEttinger	oh, also: do you know how to get either of the bots to do unchecked-math ?
21:41	gfredericks	,(set! unchecked-math true)
21:41	clojurebot	#error {\n :cause "Can't change/establish root binding of: unchecked-math with set"\n :via\n [{:type java.lang.IllegalStateException\n :message "Can't change/establish root binding of: unchecked-math with set"\n :at [clojure.lang.Var set "Var.java" 221]}]\n :trace\n [[clojure.lang.Var set "Var.java" 221]\n [sandbox$eval25 invoke "NO_SOURCE_FILE" -1]\n [clojure.lang.Compiler eval "Compile...
21:41	gfredericks	you can always just call unchecked-foo directly
21:41	gfredericks	,(unchecked-multiply 382947923 723782542342)
21:41	clojurebot	469860187885181426
21:42	TEttinger	,(unchecked-multiply (quot Long/MAX_LONG 2) (quot Long/MAX_LONG 2))
21:42	clojurebot	#error {\n :cause "Unable to find static field: MAX_LONG in class java.lang.Long"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to find static field: MAX_LONG in class java.lang.Long, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "Unable to f...
21:43	TEttinger	,(unchecked-multiply (quot Long/MAXVALUE 2) (quot Long/MAX_VALUE 2))
21:43	clojurebot	#error {\n :cause "Unable to find static field: MAXVALUE in class java.lang.Long"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to find static field: MAXVALUE in class java.lang.Long, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "Unable to f...
21:43	TEttinger	,(unchecked-multiply (quot Long/MAX_VALUE 2) (quot Long/MAX_VALUE 2))
21:43	clojurebot	-9223372036854775807
21:43	TEttinger	NICE
21:43	gfredericks	you gotta be careful with them though
21:43	TEttinger	yeah I got some weird thrown errors
21:43	gfredericks	there's this goofy half-bug where they do checked arithmetic if you're not using primitives
21:43	gfredericks	,((fn [a b] (unchecked-multiply a b)) 2984289278487 472737237232)
21:43	clojurebot	#error {\n :cause "integer overflow"\n :via\n [{:type java.lang.ArithmeticException\n :message "integer overflow"\n :at [clojure.lang.Numbers throwIntOverflow "Numbers.java" 1501]}]\n :trace\n [[clojure.lang.Numbers throwIntOverflow "Numbers.java" 1501]\n [clojure.lang.Numbers multiply "Numbers.java" 1867]\n [clojure.lang.Numbers$LongOps multiply "Numbers.java" 467]\n [clojure.lang.Numbers ...
21:44	TEttinger	that helps a lot thanks
22:33	bcham	Quick question: In this test, the code isn't being executed and I'm not sure why. The result of the expression ((clean-code "python") ...) is the correct answer, but when I run the test it just shows the unexecuted code. http://pastebin.com/bpv1K7bF
22:36	bcham	Actually I think I figured it out
23:55	lvh	In Compojure, how do I spell "anything with this route match prefix, go to this handler fn"
23:57	lvh	basically /xyzzy, /xyzzy/ and /xyzzy/* (where the asterisk means "anything") should be handed off to this ring handler fn