#clojure – 2014-04-05

2014-04-05

00:30	LLKCKfan	Does anyone know about old Caloric Prestige Series Ranges(stove/oven)?
00:43	Xavier89	ho
00:43	Xavier89	ho
00:44	Xavier89	hi
00:45	LLKCKfan	Hello
00:45	TimMc	technomancy: You around?
00:46	TimMc	technomancy: LLKCKfan needs kicking again
00:48	TimMc	Paula: ...
00:48	Paula	hla
00:50	TimMc	I didn't even know you could do CTCP with a channel.
00:59	amalloy	TimMc: sounds like a sentence i'd read in an IRC romance novel
02:19	Raynes	ls
02:19	lazybot	bin boot dev etc lost+found root srv sys
02:43	nightfly	pwd
02:43	lazybot	#clojure
02:44	nightfly	whoami
02:44	lazybot	nightfly
03:05	amalloy	exciting evening for lazybot
03:27	AmandaC	ls dev
03:27	lazybot	dev lib lost+found media root sbin selinux src sys var
03:27	AmandaC	lazybot IS FULL OF LIES!
03:36	Raynes	He's full of truth, AmandaC. Pure truth.
03:36	AmandaC	Raynes: YOU’RE LYING!
03:45	ddellacosta	AmandaC, did you just type in IRC thinking it was a term? I do that kind of sh%t all the time
03:46	AmandaC	nah, though I have done that before
03:46	AmandaC	oh wait, that might be before your join
03:46	ddellacosta	AmandaC: wait, does lazybot accept some subset of unix commands!?
03:47	AmandaC	ddellacosta: it appears no, it’s just a joke. :p
03:47	ddellacosta	AmandaC: oh. I'm torn on whether I like the joke or the supposed ability to perform ls on some filesystem in the cloud better...
03:49	ddellacosta	ah, I see now, I should have checked history...
03:49	amalloy	ddellacosta: it's actually a real filesystem, the actual / on the server lazybot runs on. but he randomly chooses like 10-15 directories to actually include in the output
03:50	ddellacosta	amalloy: ha! so it's both a joke and performing ls on some filesystem...
03:51	amalloy	ddellacosta: i included a few commands and called it the unix-jokes plugin
03:51	ddellacosta	amalloy: nice...heh
03:51	amalloy	mutt
03:51	lazybot	Woof!
03:51	ddellacosta	hahaha
03:51	amalloy	this one has actually been triggered once, amazingly
04:06	_gregking	sup
04:09	ambrosebs	sarp
04:09	Raynes	carp
04:10	ambrosebs	sarp?
04:11	ambrosebs	apparently clojurebot has nothing to say
04:48	doky	hello does anybody know how to parse params from command line to map ? i have this code but problem is when some pamam has white space https://www.refheap.com/71995
04:51	supersyy	https://github.com/clojure/tools.cli
04:52	supersyy	that might be a more suitable tool for parsing cli options
04:52	supersyy	since it probably isn't too smart to start out with a string literal to begin with
04:53	doky	supersyy: thanks i will use it
04:56	doky	supersyy: but will it works when i use it in cycle, i need to have it in something like repl, to execute these commands in loop and every time evalute this statements
04:56	clgv	supersyy: doky: I can recommend tools.cli - I used it in 3 projects already
04:57	clgv	doky: huh? what exactly do you want to do? tools.cli is intended as "command line interface"
04:59	doky	clgv: idea is: run program and there you write statemens to evaluate ... for example create,update,delete users
04:59	doky	with options you wrote
04:59	doky	https://www.refheap.com/71995
05:00	clgv	so you want to build a language that you have a repl for to manipulate your business data?
05:01	doky	clgv: yes
05:01	clgv	doky: well, there is a shortcut - you have clojure^^
05:01	supersyy	right
05:01	supersyy	i was thinking the same thing
05:01	cYmen_	good morning
05:01	clgv	seems that your operations are prefix notation anyway
05:02	supersyy	also if you already have a few shell tools laying around, you might want to try something like 'conch'
05:02	cYmen_	or just use the shell of your db ;)
05:02	clgv	doky: just take the verbs like "create" and build functions for them. if really needed for convenience you can build wrapper macros
05:03	clgv	cYmen_: right, but I assumed he wants to build more powerful abstractions
05:03	supersyy	cYmen_ yeah but I assumed he wants something like a wrapper around that stuff :P
05:03	supersyy	haha
05:03	clgv	supersyy: :P
05:04	doky	clgv: supersyy cYmen_ oh im a bit confused .. so what will be the best way to do it ?
05:04	cYmen_	^^
05:04	clgv	doky: can you describe the big picture you envision?
05:06	doky	the only statements i need to evaluate is [create\|update\|delete] [admin\|moderator\|user] [-u NAME\| -p PASS] {-n REALNAME}
05:07	doky	realname is not needed
05:08	clgv	doky: (create :admin <OTHER PARAMS>)
05:09	clgv	doky: the message is, just write the statements as plain clojure function calls (or macro calls if needed)
05:09	doky	clgv: ah ok
05:12	cYmen_	Also, this looks a bit like you have different tables for admins/users/mods. If so, I think that's weird. :)
05:13	clgv	doky: the great benefit of lisp is that you can implement languages on top of it without having to write reader/parser ;)
05:14	doky	cYmen_: table is the same only param changes
05:14	supersyy	yeah... with LightTable its all I need :)
05:14	supersyy	one big toolkit
05:17	supersyy	but as clgv said without the bigger picture,... There are tons of ways of doing the same thing in Clj - just look at the project Euler solutions and how many different approaches people can find to a single problem
05:17	clgv	doky: if all you want to do is programmatically manipulating a database - there are already clojure libraries which provide you with the basic functionality
05:18	cYmen_	Even if you want a dsl for it there is already Korma.
05:18	doky	clgv: i uses korma
05:18	supersyy	aha
05:18	cYmen_	So basically, you want to restrict the possible actions?
05:19	clgv	doky: so then just use it :D
05:21	doky	clgv: ok i haven't though about that solution :) I thought that better way will be to be sure that all params are ok and then store to db
05:22	supersyy	I still don't get what you need the CLI options for then if you use korma
05:23	supersyy	but anyway, processing cli switches, options and such can be a tedious job without a tool and might quickly pop up corner cases
05:24	doky	supersyy: i am not sure if i know what do you think ... can i pass string to korma ?
05:25	supersyy	yes
05:25	doky	supersyy: like whole statement ?
05:25	supersyy	SQL raw or entities
05:25	supersyy	both are supported
05:25	doky	supersyy: aha
05:26	supersyy	Personally I did have some trouble figuring out the Korma particulars, took me a day or 3 before I finally got it
05:27	supersyy	the manual isnt too clear on the mechanics of mostly joins - relations stuff
05:29	doky	supersyy: so the only i need is restricted other statements, becase if user will write pure sql which evaluates, he can do anythink with db
05:31	clgv	doky: well dont let the user write sql at all.
05:32	clgv	doky: this opens the door to SQL injection like problems
05:32	doky	clgv: but when i will execute as raw ?
05:32	clgv	doky: if you want your user to write queries write a query DSL
05:33	doky	clgv: no my idea was to have that params as i wrote
05:37	doky	clgv: sorry if maybe you thnink that i dont get it as you thought but i only learn clojure for not long time
05:37	cYmen_	clgv: I don't see how you can take anything the user inputs (like a name even) and use it without being in danger of sql injections.
05:38	clgv	cYmen_: well, then we are all doomed
05:38	doky	clgv: :)
05:38	clgv	cYmen_: in practice you usually have escaping or checking of inputs to prevent that
05:39	cYmen_	Or we could just escape everything properly. ^^
05:41	doky	the other solution i have is this but here param -n needs to be the last one https://www.refheap.com/71999 and it still produce the last one word as key with value nil
05:41	doky	with this string "create user -u viktor -p secret -n \"myReal name\""
05:42	clgv	doky: why are you so fixed on parsing strings? just write Clojure function calls instead of those strings.
05:43	cYmen_	Second!
05:44	doky	clgv: im not sure if i understand ?
05:45	clgv	doky: well you could just have a function "create" which is called like "(create :admin ...)"
05:46	doky	and params must have fixed possion, right ?
05:46	clgv	doky: if you need to support user queries you can do (clojure.edn/read user-query) to get Clojure data from a given string
05:46	clgv	doky: depends on how you implement that function
05:47	doky	clgv: sure :)
05:47	clgv	doky: you have fixed position or arbitrary key value pairs as default options
06:25	AeroNotix	anything for paypal integration?
06:25	AeroNotix	Soon I'm gonna open source an auth.net library
06:28	doky	clgv: no i haven't, as you wrote that string, params indicate options
06:37	clgv	doky: you did not understand me. I was just stating the default options there are ;)
06:43	wombawomba	Newbie here. I've created a lazy sequence of primes (found at https://gist.github.com/aeriksson/d27ffc64899a0face006) using the algorithm in http://stackoverflow.com/a/10733621. However, my code has some performance issues, and I'm looking for ways to speed it up. Any ideas?
06:47	cYmen_	I doubt anybody will be able to help you unless you show people your code and tell them which "performance issues" it has.
06:47	clgv	wombawomba: maintaining the map is certainly one of the problems
06:48	wombawomba	cYmen_: see the gist I linked; https://gist.github.com/aeriksson/d27ffc64899a0face006
06:48	clgv	wombawomba: I'd maintain a vector of found primes
06:49	clgv	wombawomba: for each new number you can do the divisibility check by e.g. reducing over the vector
06:49	wombawomba	yeah I kindof figured the map might be problematic
06:50	wombawomba	it's central to the algorithm though; using a vector as you propose lowers the space and time complexity
06:50	wombawomba	er, increases
06:51	clgv	wombawomba: are you sure? gotta check the original
06:51	wombawomba	the map only maps integers to integers though, so perhaps I could use some other data structure
06:51	clgv	wombawomba: ah you want to implemet the sieve of eratosthenes for the lazy-seq?
06:51	wombawomba	right
06:51	clgv	wombawomba: I think those two approaches do not fit together well
06:52	clgv	wombawomba: since you cant be really lazy with the sieve approach
06:52	wombawomba	sure I can
06:53	wombawomba	the algorithm I pasted works fine, just slowly
06:53	clgv	but you have performance issues :P
06:53	cYmen_	wombawomba: The core idea of the sieve is to remove all multiples of a number...if you have an infinite sequence that will take a while
06:53	clgv	the vector approach I mentioned will be faster for that lazy-seq ;)
06:53	cYmen_	At least that's what I think clgv means. :)
06:54	wombawomba	the sieve status is stored in the map (and in p), so evaluating it lazily is not really a problem
06:54	wombawomba	also, the map size grows as sqrt(n), which should make it plenty fast
06:55	clgv	first of all I'd store the sieve status in a java.util.BitSet since thats the most efficient way in terms of memory and operation runtime ;)
06:55	wombawomba	the python generator approach is analogous to a lazy-seq afaik, and it works well
06:56	wombawomba	I think my issues stem from the fact that recursing with a constantly changing map is slow
06:56	wombawomba	cool, I'll check that out
06:56	wombawomba	also, would making the map transient make sense?
06:58	clgv	wombawomba: in principle yes. but I'd use sieve of eratosthenes for fixed size ranges only.
07:02	wombawomba	hm.. I can't really use a bitset to encode a mapping between integers though, right?
07:05	clgv	no. you can use a BitSet to mark the primes or maybe primes...
07:05	clgv	it is totally suitable if you build a non-lazy sieve
07:07	cYmen_	How do you profile this?
07:09	wombawomba	cYmen_: I just used time to see how long it took to get the first 2000 primes, as seen at the bottom of the gist I linked
07:09	iXeno	hi... I wanna fire up a clojure runtime from java (or actually from scala, but let's say java for simplicity) - and be able to discard it and reload it when needed... and also provide java objects (or scala objects, bit again lets say java) to it during init... how should I do that?
07:09	cYmen_	Oh, I mean like how do you figure out where the bottlenecks are.
07:09	iXeno	all docs seems to focus on running clojure from lein and have that run java
07:11	wombawomba	oh, well that's a good question then. I'd like to know the answer to that too :)
07:58	ekhall	Hi everyone - was wondering if there were any Datomic users out there. Still getting db-id problems that I can't sort out. I made a gist at https://gist.github.com/ekhall/9991029
07:59	ekhall	I've gotten the same errors in demos when I simply change the entity name in the edn file - can't sort out why such a simple change causes these problems.
08:35	pyrtsa	ekhall: I'm sorry, I can't comment in detail without seeing the definition of add-patient, but it seems to me you haven't created a partition named :db.part/patient (and you're not allowed to: the "db" namespace prefix is reserved for Datomic).
08:36	pyrtsa	Either create your own partition (its ident could be e.g. :part/patient) or keep using the :db.part/user partition in your tempids.
08:37	ekhall	pyrtsa: thank you Pyrtsa, I added the clojure file to the gist with the update-patient.
08:37	pyrtsa	The partition needs to be installed with a transaction like [{:db/id (d/tempid :db.part/db), :db/ident :part/patient, :db.install/_partition :db.part/db}].
08:38	pyrtsa	ekhall: ^ So update your schema with the above. (Of course, replacing (d/tempid ...) with #db/id[...].)
08:39	wombawomba	clgv: FWIW, the slowdown in my code seems to have mainly stemmed from my update-map function. I changed it to use a loop instead, and my code now seems to run faster than that from contrib/lazy-seq
08:39	pyrtsa	ekhall: The error message said just that, btw: "Invalid db/id: #db/id[:db.part/patient -1000003]"
08:39	ekhall	prytsa: So in the other examples where there was a User entity that worked that partitiion was already set up? I guess the thing that confuses me is that (while learning) I've taken example schema that have occasionally worked (such as a "User" entity) and simply changed the entity name and suddenly it doesn.t
08:40	ekhall	I'll have to go look at that partitioning. Thank you.
08:40	pyrtsa	ekhall: Datomic has three partitions installed by default: db.part/db (for attributes etc.), db.part/tx (for transaction entities only), and :db.part/user (for you to play with, but you should create your own partitions).
08:41	ekhall	Ah, so user is already setup. I had a feeling it was something like that. Thank you pyrtsa
08:41	clgv	wombawomba: ah yes, using lazy operations for collections you want to compute eagerly is always not optimal...
08:41	pyrtsa	ekhall: Partitions are essentially just dedicated subranges of the positive values of Long typed entity IDs.
08:43	ekhall	Thank you pyrtsa - now I'm headed in the right direction.
08:43	pyrtsa	Cool.
08:43	pyrtsa	ekhall: There's also #datomic for Datomic specific discussion.
08:46	wombawomba	clgv: fixing that gave a 350x speedup for 2000 primes, and making the map transient gave a further 0.3x
08:47	wombawomba	I'm now 8x faster than the code in contrib.lazy-secs for 20000 primes
08:47	clgv	wombawomba: you are implementing this for learning purposes right?
08:48	wombawomba	yup
08:48	wombawomba	why?
08:48	clojurebot	why is Why
08:48	clgv	that I do not need to ask how you use the primes ;)
08:49	wombawomba	heh, I'm using them to solve https://projecteuler.net/ problems
08:49	wombawomba	which, again, is for learning :)
08:50	clgv	btw: for benchmarking you should usually use "criterium" though in this case for large numbers you get a fair comparison with "time" as well I guess
08:50	clgv	wombawomba: well, for using primes in different algorithms a lazy sequence is in most cases not that optimal as far as I can tell from experiences with spoj.com
08:53	wombawomba	yeah I guess that's probably true
08:53	wombawomba	although I think it makes for cleaner code :)
08:54	clgv	a function returning a vector of primes can be implemented cleanly as well ;)
09:07	petron	why aren't regexes functions?
09:07	petron	e.g. (#"a*b" "aaaabbb") => true
09:08	petron	hm, maybe they are. checks
09:08	gfredericks	they aren't
09:08	petron	and would it be possible to make them act as if they are?
09:08	clgv	petron: since they are not on the JVM and Clojure function calls are based on the clojure.lang.IFn interface
09:09	gfredericks	petron: not possible as a language user; clojure could be changed to let them be
09:09	gfredericks	you'd have to decide if they should act like re-find or re-matches
09:09	clgv	you'd either need to create a subclass of Pattern or you'd need a IFn protocol instead of the interface
09:09	petron	meh, that raises ClassCastException java.util.regex.Pattern cannot be cast to clojure.lang.IFn
09:09	gfredericks	,(proxy [java.util.regex.Pattern clojure.lang.IFn] [])
09:09	clojurebot	#<VerifyError java.lang.VerifyError: Cannot inherit from final class>
09:09	gfredericks	sounds like subclassing Pattern isn't possible either
09:09	clgv	petron: gfredericks is right, there'd be the problem what the function call to a pattern would do since there a multiple possibilities
09:10	petron	so that (#"ab" "aaaabbb") is equal to (re-find #"ab" "aaaabbb")
09:10	clgv	gfredericks: I'd have bet on that ^^
09:10	gfredericks	petron: you can do this is CLJS because IFn is a protocol there
09:10	gfredericks	s/is/in/
09:10	clgv	gfredericks: comes to my mind: http://steve-yegge.blogspot.de/2010/07/wikileaks-to-leak-5000-open-source-java.html
09:11	gfredericks	:)
09:11	gfredericks	I love how easy it is to call private functions in clojure
09:13	gfredericks	"Today the Eclipse Foundation put out a private briefing calling me a 'non-thread-safe AbstractKeywordRemovalInitiatorFactory'"
09:13	clgv	:D
09:16	ambrosebs	haha!
09:18	siscia	Hi all, is clojars down ?
09:18	TimMc	clgv: That is fantastic.
09:19	gfredericks	http://www.downforeveryoneorjustme.com/clojars.org
09:19	gfredericks	^ says clojars is up
09:19	clgv	siscia: no
09:19	gfredericks	and so do I
09:20	siscia	clgv: Thanks :)
09:25	gfredericks	my test.check failure has been shrinking for ~14 hours now
09:25	jonh	everything good takes time
09:25	jonh	:D
09:25	gfredericks	I'm thinking I might need to start a fork/helper-lib for integration-style testing w/ test.check
09:25	gfredericks	I guess helpers would be better so you can use it both ways
09:27	clgv	gfredericks: uff!
09:27	clgv	you need a progress report for that one ;)
09:29	ambrosebs	gfredericks: what's testing?
09:30	Bronsa	so it looks like calling `symbol` is not as unexpensive as I thought
09:30	Bronsa	I got a 10% perf improvements in tools.analyzer simply by avoiding a bunch of unnecessary calls to it
09:31	ambrosebs	serious
09:31	clgv	Bronsa: commit?
09:31	Bronsa	ambrosebs: looks like calling String.intern is quite expensive
09:31	Bronsa	clgv: https://github.com/clojure/tools.analyzer/commit/71c0484e99f53f8bb50fdf215625ace78183917f
09:32	clgv	interesting
09:32	ambrosebs	Bronsa: how did you figure that out?
09:32	Bronsa	ambrosebs: yourkit
09:32	ambrosebs	nice
09:33	ambrosebs	and omg 10% nice work!
09:47	yotsov	is there ongoing work on clojurescript equivalents to tools.analyzer.jvm and tools.emitter.jvm ?
09:50	ambrosebs	yotsov: Bronsa has a GSoC proposal for that
09:51	yotsov	ambrosebs: thanks
10:34	gfredericks	okay so let's say
10:34	gfredericks	a library wants to be able to serialize-deserialize things.
10:34	gfredericks	e.g., via pr and clojure.edn/read
10:34	gfredericks	but it needs to customize some special cases
10:35	gfredericks	like byte arrays or specific 3rd-party types
10:35	gfredericks	extending print-method seems like a bad choice for a library to be making
10:35	gfredericks	but what else is there?
10:37	xeqi	gfredericks: tagged elements? though it would have to include some data_readers iirc
10:37	gfredericks	edn tags are very asymmetric
10:37	gfredericks	you can make your own inside your library and not bother anybody else and that's great
10:38	gfredericks	but to make the corresponding types print with the tag requires a global change to print-method
10:38	gfredericks	I keep running into this whenever I make a library that needs to serialize/deserialize generic data
10:51	john2x	is there a library that provides Midje's checkers for clojure.test?
11:09	wombawomba	I'm getting some strange results when using a transient map in my algorithm. Specifically, I have two different versions of the same lazy sequence, one using a transient map and the other using a dynamic binding: https://gist.github.com/aeriksson/6f2a4c34481221f953a1. While the latter sequence produces correct results, the results of the former are subtly incorrect. What gives?
11:13	ambrosebs	wombawomba: looks like you're bashing the transient in place.
11:13	ambrosebs	Use assoc! like assoc.
11:13	ambrosebs	don't rely on side effects.
11:15	ambrosebs	,(doc assoc!)
11:15	clojurebot	"([coll key val] [coll key val & kvs]); When applied to a transient map, adds mapping of key(s) to val(s). When applied to a transient vector, sets the val at index. Note - index must be <= (count vector). Returns coll."
11:15	mahakala	Does anyone in here have experience with heroku, postgresql, and setting environment variables? My app won't deploy and I need help.
11:15	ambrosebs	The doc for assoc! is awful, ignore it.
11:17	wombawomba	ambrosebs: Sorry, I'm not sure I understand. How should I use assoc!, do you mean?
11:17	ambrosebs	wombawomba: use the result of assoc!, and don't assoc! a transient more than once
11:17	gfredericks	ambrosebs: yeah it misleads wrt usage and is incorrect since it occasionally doesn't return coll
11:18	gfredericks	I might create a jira ticket just to slightly bog down the process with docstring updates
11:18	wombawomba	ah, I see
11:18	ambrosebs	gfredericks: please do
11:19	gfredericks	on it!
11:19	gfredericks	I'll have to decide on new wording myself though.
11:19	ambrosebs	assuming there's no current ticket.
11:20	gfredericks	http://dev.clojure.org/jira/browse/CLJ-1385
11:21	gfredericks	I think alex misunderstood the description
11:21	gfredericks	unless it was edited later
11:21	wombawomba	ambrosebs: I actually started out using it that way, but it ran slowly because I had to use persistent! when building my lazy-seq (since I can't use recur) for that.
11:21	wombawomba	Is there any way to get around both these issues?
11:24	mahakala	Can anyone here answer my question?
11:27	gfredericks	bjeanes: where are you when somebody has questions about heroku and env variables
11:28	ambrosebs	wombawomba: I can't read your code. Might help to rewrite it with persistent data structures.
11:29	wombawomba	ambrosebs: oh, I have that too. one second
11:29	ambrosebs	thanks
11:29	mahakala	is bjeanes the man for this topic?
11:31	ambrosebs	wombawomba: maybe post your first transient attempt
11:39	jonasen	https://github.com/jonase/elements <- a fun app I've been working on (using CLJS, SVG, React&Reagent and ofcourse core.async)
11:40	wombawomba	ambrosebs: all four versions are now at https://gist.github.com/aeriksson/6f2a4c34481221f953a1
11:47	ambrosebs	wombawomba: can you add an extra loop argument for the c's in (cons c ...), then just pass the tranisent around with recur, and use persistent! at the end, and use the result to build a lazy-seq?
11:47	ambrosebs	wombawomba: very likely I'm missing something
11:49	ambrosebs	ah sieve is infinite?
11:50	wombawomba	yes
11:54	ambrosebs	wombawomba: haven't used it myself, but maybe try https://github.com/ztellman/bizarro-collections
11:55	ambrosebs	I don't think transients can help here
11:56	ambrosebs	I'm not particularly an expert, hopefully someone will double check.
12:00	wombawomba	hm oka
12:00	wombawomba	y. I'll have a look
12:02	alpheus	What transforms a vector into a vector of pairs? e.g. (f [1 2 3 4 5 6]) => [[1 2] [3 4] [5 6]]
12:03	ambrosebs	,(vec (map vector (partition 2 [1 2 3 4 5])))
12:03	clojurebot	[[(1 2)] [(3 4)]]
12:03	ambrosebs	close enough
12:03	alpheus	partition -- that's what I was looking for
12:09	ambrosebs	wombawomba: might be worth checking if you're using the fasted arithmetic ops https://github.com/ztellman/primitive-math
12:10	ambrosebs	*fastest
12:43	favetelinguis	total beginner trying to get things running in lighttable so i can use test.check in school project but not much is going my way, anyone got time to help?
13:56	abaker	so what's the preferred mechanism for asserting constraints on function inputs … pre/post? something in a do form? something else?
14:21	kenrestivo	i'm getting an access denied ("Reason: forbidden") when doing lein deploy clojars, using the same username and password that i can log in just fine using the web interface.
14:21	kenrestivo	sorry "ReasonPhrase: Forbidden"
14:24	xeqi	kenrestivo: that version already exists
14:24	kenrestivo	yep
14:24	kenrestivo	xeqi: thanks, bumped version and all is well
14:29	doky	hello can anybody know how to correctly receive data ? https://www.refheap.com/72300
14:34	xeqi	doky: you're doing a read-string then a pr-str and then a read-string again on the response text?
14:34	lemonodor	kenrestivo: i run into that all the time. a friendlier error message might be nice.
14:35	doky	xeqi: and how it should be ?
14:36	xeqi	just read the string once and get back the vector?
14:38	doky	xeqi: ok i will try
14:44	doky	i'm confused ... still get only one of maps https://www.refheap.com/72300
14:45	doky	xeqi: isnt problem with emit-clojure-ds ?
14:47	xeqi	doky: possibly, you're not including the server code or your middleware stack that will transform :body into a string
14:49	xeqi	it looks like your read-string call is only returning the first map (since you wrap that result in vector). this leads to thinking its a server setup problem
14:50	doky	xeqi: https://www.refheap.com/72300
14:52	doky	xeqi: do i need something like to write it to stream or something like that ?
14:56	xeqi	doky: looks like ring servlet stuff treats a vector :body as a chunked response, and then sends the individual elements https://github.com/ring-clojure/ring/blob/1.2.2/ring-servlet/src/ring/util/servlet.clj#L89
14:57	xeqi	which would make coorespond with what your seeing
14:57	xeqi	I'd wrap :body in a pr-str
14:57	xeqi	so that :body is a string and it gets sent as a string representing the entire vector
14:57	doky	ok i will try
15:02	doky	xeqi: thanks you very much :) thats work great :)
15:07	munderwo	Hi all. Im using aleph and compojure to write a proxy. Im running into an exception 'localedata.jar (Too many open files)' . Anybody have an idea what localdata.jar does or who might be calling it too many times?
15:20	yotsov	munderwo: I guess I would check if the problem persists if switching to another java implementation: if using 1.5 then trying 1.6, if using openjdk then trying oracle jdk...
15:21	munderwo	thanks, I gave that a shot. Mysteriously it seems to have happened in connection with me doing something stupid with configuration and atoms… weird.. but have fixed it now.
15:23	afgdf	hello, do i need to learn cypher to fully use neo4j in clojure(neocons)?
15:31	yotsov	afgdf: it is probably very subjective, but I would think if you want to use any data store, it pays to know its "native" query language. I am trying to imagine using Postgres only via Hibernate never learning SQL... not a nice thought. When you have a data store, and you want to go prod with it, you always end up with times when you want to talk to it directly, with nothing standing between you and it
15:51	Bronsa	,(require 'clojure.reflect)
15:51	clojurebot	nil
15:52	ivan	https://github.com/monsanto/nreplds nREPL domain socket support; I had no idea this existed
15:52	Bronsa	,(->> (clojure.reflect/type-reflect clojure.lang.ISeq) :members (filter (comp '#{equals} :name))))
15:52	clojurebot	()
15:52	Bronsa	:/
15:53	Bronsa	err
15:53	Bronsa	,(->> (clojure.reflect/type-reflect clojure.lang.ISeq :ancestors true) :members (filter (comp '#{equals} :name))))
15:53	clojurebot	()
15:54	Bronsa	looks like type-reflect doesn't return Object members when the class doesn't override them
15:56	cddr	Any idea how one might run a lein task from a test?
16:00	gfredericks	cddr: that's tricksy because of lein's dual-jvm architecture; why're you trying to do that?
16:13	cddr	Trying to practice "TDD" and so before adding doc generator to the project, I was thinking of writing some tests to ensure that the docs get generated correctly
16:14	cddr	Maybe overkill for most use-cases and if you really want to do this, you can write those unit tests in bash
16:15	cddr	Can you expand on the dual-jvm architecture? A google search doesn't come up with anything useful
16:22	gfredericks	leiningen's default behavior is to have one jvm for itself and another for everything that runs in your project
16:22	gfredericks	so in your case this means that the code for running a lein task isn't even around when your tests are running
16:25	cddr	That makes sense
16:25	Ihearyouman	gfredericks: that also means it uses a clojure compiler for itself and another for every project right?
16:27	gfredericks	Ihearyouman: I'm not sure exactly what you mean by that, but probably so?
16:31	Ihearyouman	gfredericks: like it uses its own clojure.jar for its stuff and a different clojure.jar for projects
16:32	gfredericks	that's definitely true when the requested version of clojure is different from the one leiningen happens to be using
16:32	gfredericks	otherwise they'd be the same jar, coincidentally
16:41	Ihearyouman	gfredericks: ok, I asked cause 'lein run' downloaded a clojure.jar the first time for lein app project but I don't really know what clojure version is lein using internally
16:55	gfredericks	Ihearyouman: ah right
17:05	zakwilson	When I try to run a freshly-generated project from lein-droid (with lein droid doall, or subsequently with lein droid run), I get java.io.FileNotFoundException: Could not locate clojure/tools/nrepl/server__init.class or clojure/tools/nrepl/server.clj on classpath
17:25	zakwilson	And this problem happens consistently with multiple newly-created projects and even different versions of lein-droid.
17:26	cYmen_	Could somebody tell me what "reify" means?
17:27	cYmen_	And how to pronounce it. :p
17:30	andyf_	cYmen_: The definition is roughly the phrase "thing making" or "to make a thing out of"
17:30	cYmen_	uh...so? :)
17:31	andyf_	I've heard it pronounced two different ways: REE-if-eye and RAY-if-eye
17:32	zakwilson	Google gives the definition as "make (something abstract) more concrete or real"
17:32	andyf_	In Clojure it more specifically means to make a Java object (a thing) with a certain set of method behaviors implemented for it
17:32	cYmen_	So it creates a class and an instance of it?
17:34	zakwilson	Yes
17:37	andyf_	zakwilson: Have you tried 'lein deps :tree' to see if tools.nrepl is in your dependencies, perhaps somewhere indirectly you didn't intend it? I haven't used lein-droid, so can't help you more specifically there.
17:46	zakwilson	andyf_: I had not, and I think that has me pointed in the right direction (it's not using the dev profile for dependency resolution, and that's where the nrepl dependency is specified, but something tries to use it at runtime)
17:49	zakwilson	andyf_: and now I have it not crashing on launch by using 'with-profile dev'. That'll do.
17:50	andyf_	cool
17:50	amalloy	cYmen_: well, reify creates a class once at compile-time, and creates instances of that class at runtime
17:50	cYmen_	hm okay
17:50	amalloy	(which, really, is what a lot of things in clojure do - fn does that as well, for example)
17:51	amalloy	in particular reify creates classes that satisfy a set of interfaces+protocols that you choose
17:51	cYmen_	So basically you're creating something like a java interface?
17:53	amalloy	no
17:53	cYmen_	Glad I asked.
17:53	amalloy	you're creating an implementation of an existing interface
17:53	cYmen_	At runtime but the interface is defined at compile time?
17:53	amalloy	,(.close (reify java.io.Closeable (close [this] (println "closing!"))))
17:53	clojurebot	closing!\n
17:53	cYmen_	O_o
17:54	amalloy	no. no interface is ever created by reify
17:54	cYmen_	Uh...okay but a class?
17:54	amalloy	yes
17:55	amalloy	here i took an existing interface, java.io.Closeable, and created an object implementing it; then i called its .close method like i would any other object
17:55	cYmen_	So it's like a cast?
17:55	amalloy	not at all
17:56	amalloy	cYmen_: what other languages are you familiar with, for analogy?
17:56	cYmen_	But if you're just creating an instance of a class what does the function definition do there?
17:56	cYmen_	C++, Python
17:57	andyf_	The function definition gives the behavior of that instance when that method is called on it.
17:57	cYmen_	At compile-time?
17:58	andyf_	Perhaps clearer to say "that class" rather than "that instance"
17:58	amalloy	yes, at compile time
17:59	cYmen_	Alright, so basically what the statement above does is define a new class which adheres to an interface and then instantiate it?
18:00	amalloy	yes, although those two things happen at different times. consider: (defn foo [message] (reify Closeable (close [this] (println message))))
18:00	amalloy	that creates a class once, at compile time, and creates an instance every time it is called
18:01	cYmen_	So, the best way to think about it is like this is Java's "new" with the class definition being sort-of in-place?
18:02	amalloy	well, that exists in java: (reify Closeable (close [this] (println message))) => new Closeable() {public void close() {System.out.println(message);}};
18:03	amalloy	that's exactly what reify does
18:03	cYmen_	okay
18:03	cYmen_	thanks
18:19	AmandaC	,true
18:19	clojurebot	true
19:04	AmandaC	ClojureScript question — how could I set a value on a window object, specifically __onGCastApiAvailable
19:12	gtrak	AmandaC: aset?
19:17	amalloy	or just set!, as long as you have the externs set up so that gclosure doesn't optimize that away
19:55	AmandaC	If I want multiple statements in an if’s “true” block, what should I be using?
19:56	gfredericks	if the false part is empty, you want when
19:56	gfredericks	otherwise you just nest a do
19:57	AmandaC	,(doc do)
19:57	clojurebot	It's greek to me.
19:57	AmandaC	o.o
19:57	gfredericks	do just combines multiple statements into one
19:58	AmandaC	ah
19:58	gfredericks	,(do (println 3) (println 4) "Five")
19:58	clojurebot	3\n4\n"Five"
19:58	gfredericks	the docs are "missing" because it's a special form
19:58	gfredericks	,(clojure.repl/doc do)
19:58	clojurebot	excusez-moi
19:58	gfredericks	&(clojure.repl/doc do)
19:58	lazybot	⇒ ------------------------- do (do exprs*) Special Form Evaluates the expressions in order and returns the value of the last. If no expressions are supplied, returns nil. Please see http://clojure.org/special_forms#do nil
19:58	gfredericks	hey there it is
20:23	yedi	in om: having to manually manage / persist scroll state seems so inelegat
20:23	yedi	s/inelagat/inelegant
20:53	arrdem	,(source when)
20:53	clojurebot	Source not found\n
20:54	arrdem	,(defmacro arrdems-shitty-when [c & forms] `(if ~c (do ~@forms)))
20:54	clojurebot	#'sandbox/arrdems-shitty-when
20:54	arrdem	,(source arrdems-shitty-when)
20:54	clojurebot	Source not found\n
20:54	arrdem	~botsmack
20:55	amalloy	arrdem: source works by looking up :line and :file metadata, and then going to read the file
20:55	amalloy	it's never going to work for something you def at the repl
20:55	arrdem	amalloy: lame... source should be metadata :P
20:56	arrdem	that would actually be cool... if the expression tree was metadata...
20:56	amalloy	sure, but people complain about clojure's slow startup time already
20:56	arrdem	I didn't mean for production...
20:57	amalloy	you can always use technomancy's serializable-fn
20:57	amalloy	which indeed stores the source, and lexical closure, as metadata
20:58	arrdem	shiny...
20:58	arrdem	(inc technomancy)
20:58	lazybot	⇒ 105
21:00	arrdem	Raynes: is there a better way for me to do IO on lazybot than just a /msg?
21:01	Raynes	I don't understand the question. Can I buy a vowel?
21:01	arrdem	I'm pondering digging my cloutjure project back up again, part of which was going to be tracking per user chan karma
21:02	Raynes	So you want to talk to lazybot to do what?
21:02	Raynes	Get the amount of karma?
21:02	arrdem	yarp
21:03	arrdem	ideally without spamming #clojure :P
21:03	Raynes	That would be a lot of /msg
21:03	amalloy	well, it would be like zero /msg, because karma is channel-local
21:03	Raynes	It'd be best if you could just talk to his database.
21:04	arrdem	yeah that's why this is hard... I mean I could design a query system designed to detect when #clojure is idle and spam then... but why.
21:04	amalloy	pffft
21:04	arrdem	lol @ amalloy
21:04	khushildep	Hello all - I wanted to ask, is it a breach of guidelines to post a link to a position we are looking to fill in our company for strong functional programmers?
21:04	AmandaC	I don’t suppose there’s any way I could get a hybrid clojure/clojurescript REPL in Emacs? Preferably with the -script one running in my webpage. I imagine not, but I figured I’d ask anyway. :p
21:05	arrdem	khushildep: to this chan or to the mailing list... the mailing list seems to put up with it but I've never seen anyone try to recruit here in ~20 months of activity.
21:06	khushildep	arrdem: thanks for the advice so mailing list is the best place or is there somewhere else which would be more suited?
21:07	arrdem	khushildep: probably... but don't come to me if your email gets moderated.
21:07	khushildep	:)
21:07	amalloy	there are occasional recruiting messages to the mailing list
21:07	amalloy	i think it's fine
21:07	gfredericks	reiddraper: woohoo I finally figured it out: https://github.com/fredericksgary/test.check/blob/1941fa1f78e59013fefb2bebed5b63549a15a7e8/src/main/clojure/clojure/test/check/generators.clj#L626
21:07	amalloy	but then, i don't read the mailing list :P
21:08	gfredericks	I thought for a couple days it was going to have to be terrible
21:08	arrdem	I skim the daily digest... takes ~30s and I get to feel more involved without contributing anything :P
21:08	xeqi	khushildep: I've seen several job posts on the mailing list, and I'd welcome them there
21:09	arrdem	$seen nsa
21:09	lazybot	I have never seen nsa.
21:09	arrdem	sneaky bastards
21:10	arrdem	dang someone else thought of that already :P
21:17	gfredericks	$seen the matrix
21:17	lazybot	I have never seen the.
21:17	gfredericks	$seen Community
21:17	lazybot	I have never seen Community.
21:17	gfredericks	there we go
21:21	gfredericks	pro tip: you cannot (reasonably) recur in a macro because of the arg-mismatch caused by &env and &form
21:22	gfredericks	apparently this is the first time I've wanted to recur inside a macro
21:24	gfredericks	eh, it was a dumb idea anyways. emitting a call to the macro works just fine.
21:27	amalloy	that's interesting, gfredericks. i guess i've never tried it either
21:27	amalloy	you can always (defmacro foo [x] (loop [x x] (... (recur (rest x))))), though, even if emitting a call to the macro were no good (eg, because you've lost some other context
21:27	amalloy	)
22:25	mercwithamouth	arrays in clojure are FIFO?
22:27	technomancy	arrays on the jvm are fixed-length
22:29	mercwithamouth	technomancy: hmm i was more so looking for an explanation to https://gist.github.com/anonymous/37688d104f0fd7420a42
22:29	mercwithamouth	i see what's going on. i was wondering if it starts from the bottom because thats how arrays work when iterating over them or if 'assoc' was behind it
22:31	tmciver	mercwithamouth: [1 2 3 4] is a vector. reduce takes one element at a time, left to right.
22:32	mercwithamouth	new developer... if left to right would the result be {1 1, 2 4...} then?
22:32	mercwithamouth	wouldn't*
22:33	tmciver	mercwithamouth: ah, that's a map and its keys are not in the same order as the input collection (vector).
22:34	mercwithamouth	ok so i shouldn't put much emphasis on the order since with maps order is inconsistent since lookup focuses on the key
22:34	mercwithamouth	alright
22:34	tmciver	mercwithamouth: yep
22:34	mercwithamouth	works for me
22:59	AmandaC	Can someone point me at some simple code that uses core.async so I can get a feel for how I should be using it?
23:01	AmandaC	Actually, which would be more idiomatic — I’m making something that pulls contacts out of a contacts database. I was thinking of using it where it’s a channel that gets retuned and then the API’s user can pull from that, but I’m thinking maybe a lazyseq would be more idiomatic?
23:03	AmandaC	Argh, I think I’m getting ahead of myself again in this mess.
23:05	bob2	I'm still learning c.a, too, but do you have code that does the above already, without c.a? I'm finding it easier to go from working code to core.async'd than to jump straight to it.
23:06	AmandaC	The problem is what spits out the contact info is a callback, one contact at a time.
23:07	bob2	ah, it's an existing api?
23:07	AmandaC	Yep
23:07	mercwithamouth	hmm why doesn't this work? https://gist.github.com/anonymous/a08eefaaf162fac167a3
23:07	coventry	AmandaC: That does sound like a good context for using a core.async channel.
23:08	mercwithamouth	reverse (str greet reply) in the gist, sorry
23:08	bob2	mercwithamouth, what did you want (greet "hey!") to do?
23:08	bob2	greet is presumably a string not a callable?
23:08	mercwithamouth	return the string "hey"
23:08	mercwithamouth	then join the two
23:10	coventry	AmandaC: There are some examples of serializing javascript callback outputs in the dotsters game, might give you some ideas about how to do it with the db callbacks. http://rigsomelight.com/2013/08/12/clojurescript-core-async-dots-game.html (It's cljs, but for this purpose the behavior should be the same for clj.)
23:10	mercwithamouth	bob2: oops =P
23:10	mercwithamouth	dur...thanks
23:17	gtrak	is there a way to link async channels to cascade on close?
23:17	gtrak	besides incidentally in things like pipe and friends?
23:30	yedi	in om: is there a way to update the cursor of the parent node?
23:31	yedi	i'm using build all to build some subcomponents, but those subcomponents need to be able to update the parent components state
23:32	ap-	hello all! Clojure newcomer here (but long time common lisp user)
23:32	yedi	hey there
23:32	yedi	welcome
23:32	ap-	I have question regarding tooling...
23:33	arrdem	welcome to the land without setq :P
23:33	ap-	there must be a way of doing this.. but what the heck is equivalent of break-on-signals ?
23:33	ap-	i.e. have clojure stop and show me a stack trace when an exception is raised?
23:33	eraserhd	What simple html generation mechanism are people using these days?
23:33	jph-	eraserhd, templating? i'm using selmer atm, but many use hiccup
23:33	arrdem	ap-: it should do that by default. the exception stack isn't terribly readable, but that's the default behavior.
23:34	arrdem	ap-: as long as you allow the exception/signal to propagate to the top level at least
23:34	ap-	no - it only does it if the signal is uncaught
23:34	ap-	which is totally different
23:34	eraserhd	jph-: Hiccup seems good for working with html as data, but not good for templating. Unless I'm missing something.
23:34	jph-	eraserhd, checkout selmer
23:34	jph-	yogthos/selmer on github
23:35	jph-	for a quick example, create a demo project with "lein new luminus testapp"
23:35	arrdem	ap-: we're sitting atop the JVM here. You can manually implement your catch cases to do a stack trace print, but there is no standard way to get such printing for free.
23:35	jph-	and then browse the src/testapp/views directory
23:36	eraserhd	jph-: This looks useful.
23:36	arrdem	ap-: the core.stacktrace library provides the utilities you want to do this.
23:36	ap-	arrdem: thanks
23:36	jph-	eraserhd, yep, it has nice inheritance stuff for partial views, etc
23:36	arrdem	ap-: no worries!
23:37	ap-	I sure do miss the slime debugger/inspector I tell you that.
23:37	ap-	but clojure really rocks.
23:37	arrdem	yeah.. the lack of out of the box form stepping is one of the things that several people are working on with varying degrees of success.
23:37	ap-	even if I've had to reprogram my brain to write code with immutable structures
23:38	jph-	ap-, "It Gets Better"
23:39	jph-	and once you realise the benefits you get from immutability
23:39	arrdem	jph-: we have awesome stuff like a real load path! :P
23:39	jph-	yep
23:39	jph-	clojure has spoilt me for almost all other languages
23:39	jph-	i took a brief look at the CL variants recently
23:39	ap-	arrdem: whatyda mean?
23:39	jph-	none really stood out for me
23:39	ap-	like, libraries?
23:40	jph-	ap-, for me, i want a CL that has a good third party library packaging/dependency system
23:40	arrdem	ap-: to me Clojure's namespace and selective import structures are huge features. Only in the last six months did R7RS bring anything remotely like that to Scheme, and CL still doesn't have an equivalent that I consider usable.
23:40	jph-	arrdem, i fucking love how clojure does namespaces now i 'get it'
23:41	arrdem	jph-: I mean quicklisp is a thing... but it's not a thing I like
23:41	arrdem	anyway. we shouldn't be trash talking in front of the new guy :P
23:41	ap-	arrdem: weird... I thought how weird/clunky clojure namespaces were for the first 4 weeks. (compared to how nice the symbol based ones of CL were.)
23:41	ap-	arrdem: must be one of those things your head gets used to.
23:42	jph-	ap-, for a month or two namespaces were voodoo to me, i had to keep looking at examples to figure out how to use them
23:42	jph-	now it's second nature
23:44	arrdem	jph-: I mean from a language implementation sandpoint, namespaces are kina weird.
23:44	arrdem	jph-: not first class and all... which is actually nice about CL's namespaces.
23:44	jph-	arrdem, you mean they're hidden away elsewhere?
23:44	ap-	I'm thinking of writing something where there would be thousands (literally) of agents around. Is that "normal" or insane? The idea is that periodically, some subset of them would be "woken up" by some external event. Is such a design going to get me into troubles with some limitations I don't yet understand?
23:45	jph-	i remember a friend bitching about namespace overlapping in ruby... i only experienced it once, i never have that issue in clojure
23:45	jph-	i have so much control over my namespaces
23:45	arrdem	ap-: depends on how your threadpool is controlled and how many agents you expect to have active at once
23:45	jph-	at first i thought it was too much control, and made code harder to read
23:46	arrdem	ap-: that may actually be a better use of the core.async library
23:46	jph-	ie, you could either (:require [clojure.string :as s / str / string] or :refer :all or :refer [upper-case]
23:46	jph-	lots of power
23:46	arrdem	I still don't get why use lets you :exclude and require doesn't...
23:46	arrdem	,(doc require)
23:46	ap-	arrdem: are there guidelines? i.e. a grunty server, 8 cores, 64 Gb ram... 10,000 threads should be ok?
23:46	clojurebot	"([& args]); Loads libs, skipping any that are already loaded. Each argument is either a libspec that identifies a lib, a prefix list that identifies multiple libs whose names share a common prefix, or a flag that modifies how all the identified libs are loaded. Use :require in the ns macro in preference to calling this directly. Libs A 'lib' is a named set of resources in classpath whose contents...
23:47	arrdem	ap-: I mean the only way to find out is to try... right? :P
23:47	arrdem	ap-: benchmark then optimize and all that..
23:47	ap-	arrdem: yeah, but that's the expensive way... others may have the relevant experience already
23:47	ap-	I noticed Rich Hickey's Ants demonstration just declared a big array of agents at startup, no?
23:47	arrdem	I've got 1k DOGE says I can spin up and hammer 10k threads in < 15 lines...
23:48	ap-	but it's just a toy...
23:48	arrdem	... and a high load toy is a reasonable approximation of a presumably lower load production system, no?
23:48	ap-	arrdem: oh, spinning them up is easy... keeping them from starving and keeping each other from working is another story
23:49	arrdem	totally. all that depends on the parallelism semantics of your application and I can't comment.
23:49	ap-	but my impression is that clojure is encouraging me towards this sort of design. Just curious if others have done that.
23:49	arrdem	clojure.core.reducers may be something for you to look at
23:49	ap-	I guess I'm a bit scared because I have no idea how I would profile/debug such a design (at the moment).
23:50	ap-	(core.reducers? don't even know what that is. I'll go check it out).
23:50	arrdem	$google clojure core reducers
23:50	lazybot	[Clojure - reducers] http://clojure.org/reducers
23:51	jph-	ap-, the difference is you dont have state to really worry about
23:51	jph-	ap-, due to immutability
23:52	arrdem	jph-: unless he does evil things with mutables or atoms...
23:52	jph-	yeh
23:52	jph-	which reminds me, i always get a laugh about that "one library that rich hickey doesnt want you to know about!"
23:52	jph-	that lets you mutate stuff
23:52	ap-	well... yeah, each agent will at least have to keep some sort of state
23:53	ap-	but it's fairly well contained; an event occur; some subset of agents each "consider" the task, compute some internal state, and add some value to a priority queue somewhere, then go back to sleep.
23:53	jph-	you do have to learn a different way to think
23:54	jph-	but at the end, you have a much more dependable, performant system
23:54	arrdem	anyone know of a 2d topology library for Clojure or am I just gonna have to roll my own..
23:56	jph-	i'd assume there's something in the java world you can leverage
23:56	arrdem	yeah I'm looking at JTS now.
23:57	arrdem	well this is garbage... no circles! only polylines...