#clojure – 2015-07-25

2015-07-25

00:00	TEttinger	I can kinda tell what's going on
00:00	TEttinger	,(let [o *] (Math/floor (o (o (o 1/2)))))
00:00	clojurebot	0.0
00:00	TEttinger	,(let [o /] (Math/floor (o (o (o 1/2)))))
00:00	clojurebot	2.0
00:02	TEttinger	so it either repeats 0 times for *
00:02	TEttinger	err
00:02	TEttinger	repeats n times for *
00:02	TEttinger	or n + 2 times for /
00:03	justin_smith	yup
00:03	justin_smith	that's so we get the right answer no matter which one gets picked
00:04	TEttinger	,(/ (/ 3))
00:04	clojurebot	3N
00:04	TEttinger	,(* (* 3))
00:04	clojurebot	3
00:05	kavkaz	How do I calculate the sqare root of a number in Clojure?
00:05	justin_smith	,(Math/sqrt 2)
00:05	clojurebot	1.4142135623730951
00:05	TEttinger	kavkaz: typically you use the built in stuff in Java's Math class
00:05	TEttinger	like justin_smith demonstrated
00:05	justin_smith	TEttinger: remember reduce supplies two args - that's the last bit to solving the whole thing
00:05	TEttinger	Math does not have a cube root, but it does have pow
00:06	kavkaz	Oh I see, thanks justin_smith, TEttinger
00:06	kavkaz	I thought I tried the same thing before, but trying it again in the REPL showed me i had a typo
00:06	TEttinger	,(reduce * [2 2])
00:06	clojurebot	4
00:07	TEttinger	,(reduce / [2 2 2 2])
00:07	clojurebot	1/4
00:07	TEttinger	ah
00:07	justin_smith	and there you have it
00:07	TEttinger	,(/ (reduce / [2 2 2 2]))
00:07	clojurebot	4N
00:07	TEttinger	,(* (reduce * [2 2]))
00:07	clojurebot	4
00:07	TEttinger	neat
02:44	TEttinger	justin_smith: re: core.matrix I think it's a great idea but I don't know how it interops with existing java code that produces 2d primitive arrays?
02:45	justin_smith	TEttinger: it's a protocol, at least one of the backing implementations uses jblas
02:48	crocket	Is clojurescript ok for making command line apps?
02:51	TEttinger	hm. vectorz has an impl for double arrays (1D I think) being "vectorizable"
03:19	crocket	Does clojurescript run on node.js without much hassle?
03:36	crocket	Can reader monad be an idiomatic construct in clojure?
03:38	crocket	Reader monad can pass log config data down to the function at the bottom of a call stack without adding the log config to every function in the middle.
03:39	crocket	Reader monad obviates global log config var.
03:47	xtrntr	hi, i tried this example on rosetta code
03:47	xtrntr	it doesn't work
03:47	xtrntr	http://rosettacode.org/wiki/Draw_a_sphere#Clojure
03:47	xtrntr	"could not locate quil/core_init.class or quil/core.clj on classpath" it says
03:50	xtrntr	i followed the instructions on the quil homepage too, met with the same problem
04:00	oddcully	xtrntr: have you started with the lein template as described here: https://github.com/quil/quil/wiki/Installing ?
04:43	xtrntr	oddcully: sorry for the late reply
04:43	xtrntr	i saw that page and yea it works for me now :)
04:49	xtrntr	the example on the page works, not the rosetta code snippet
04:49	xtrntr	will -try- at it
05:21	kwladyka	i stack during write algorithm, i recursive problems :P Do you know good pattern or best practice to write complex algorithms? I don't know, like draw this on paper or something. I am looking new creative things which will help me solve it.
05:52	crocket	How do I pass log config to every log function concisely?
05:53	crocket	log/info(log-config "ok, log this")?
05:53	crocket	This is not working well.
05:53	crocket	You're going to use a global object, or pass log-config everywhere.
05:53	crocket	What else do we have in clojure?
05:55	TEttinger	you may be able to set a log-config as a default? what logger are you using?
06:06	crocket	TEttinger2, I currently use tools.loggin and unilog.
06:06	crocket	I even contribute to unilog.
06:06	crocket	It uses logback.
06:06	crocket	It's not going to work on clojurescript.
06:28	kwladyka	it is maybe stupid question, but i am totally confuse now... When use for and when use loop with recur? i have some situations where i am not sure which one should i use in algorithm.
06:29	kwladyka	i need to build tree of solutions, like backtracking
06:30	kwladyka	and some of branch will fail so shouldn't be show as result
06:30	kwladyka	but some will pass
06:31	kwladyka	oh... it is just complex :)
06:31	kwladyka	maybe i will find something in the Internet
06:45	crocket	Reader monad for the win
06:49	wasamasa	crocket: stuart sierra's component library gives you dependency injection to solve that problem
06:55	xtrntr	i get this error when following the clojurescript tutorial
06:55	xtrntr	Error: Could not find or load main class clojure.main
06:55	xtrntr	when i try to run java -cp cljs.jar:src clojure.main build.clj in termianl
06:56	xtrntr	using os X
06:56	xtrntr	anyone knows why?
07:34	jaarod	hi.. if you are typed clojure user, are you using it everywhere in your new code?
07:35	xtrntr	oh :(
07:39	crocket	Is component sort of reader monad?
07:49	crocket	If a library uses clojure 1.6 and another uses 1.7, will there be a problem?
08:23	stian	crocket: clojure rarely breaks backward compatibility, 99% of the time stuff just works after an upgrade without any changes.
08:25	crocket	If A requires clojure 1.6 and B requires 1.7 and C requires A and B, C will end up requiring 1.6 and 1.7.
08:26	crocket	JVM wasn't known to handle multiple versions of the same dependency well.
08:27	crocket	stian, ^^
08:28	justin_smith	"If A requires clojure 1.6 and B requires 1.7 and C requires A and B, C will end up requiring 1.6 and 1.7." - no, this is 100% wrong
08:28	crocket	Then, what
08:28	justin_smith	one of the versions is picked, the logic for picking one is up to the tool (likely lein in your case)
08:29	justin_smith	the primary job of lein is to take your project.clj and build a classpath. Only one of those deps will end up in the classpath it generates.
08:29	crocket	If 1.6 and 1.7 are incompatible, what happens?
08:29	justin_smith	crocket: then you are fucked. But they are compatible, so you are fine.
08:29	stian	crocket: afaik, it will use the clojure version defined in your project, not the one defined in the library.
08:30	justin_smith	stian: yes, if you explicitly have a top level dep, it will override transitive deps (with some caveats)
08:30	crocket	I don't like this.
08:31	justin_smith	crocket: feel free to find a language ecosystem where libs don't have versions.
08:31	crocket	justin_smith, I think it makes sense to be able to load two versions of the same dep.
08:31	crocket	npm does that.
08:31	justin_smith	and it sucks
08:32	justin_smith	crocket: note that with clojure on node, you can't have two versions of the same namespace
08:32	crocket	Is it ok to use OSGi to load multiple versions of the same dep?
08:32	crocket	Ah, right
08:32	justin_smith	crocket: it's possible, and it sucks.
08:33	crocket	namespace doesn't support versions.
08:33	justin_smith	right
08:33	crocket	This is very common.
08:33	crocket	A depends on logback 0.9, and B depends on logback 1.3.3.
08:34	crocket	logback 0.9 is incompatible with 1.3.3
08:34	crocket	Then, I can't depend on both A and B.
08:34	justin_smith	there's an experimental version of clojure from rritoch that supports multiple versions of a namespace via osgi, but I don't really think the result is worth the complexity
08:35	crocket	I wish Rich Hickey solved that problem up front.
08:35	justin_smith	he did, the solution is not to support multiple versions of one namespace
08:36	crocket	That's not a solution
08:37	crocket	It amounts to declaring that it's a non-problem.
08:37	crocket	no problem, no solution.
08:37	justin_smith	there's no way of allowing multiple versions of a namespace in one process that is better than not having the feature
08:46	crocket	I don't think Rich Hickey would accept OSGi...
08:46	crocket	He tries to be conservative.
08:46	crocket	bruncol, You just sent me a spam message.
08:47	crocket	Are you on windows?
08:53	crocket	justin_smith, Do you know reader monad, typeclass, and dependency injection?
09:09	justin_smith	I'm familiar with these concepts to various degrees...
09:10	justin_smith	in clojure we use protocols and multimethods instead of typeclasses
09:12	justin_smith	crocket: typically when I think I need a monad what I end up with is an extra parameters or bindings map that each "monadic" function takes and passes to other functions
09:15	crocket	Passing log-config to every function that doesn't need to log is not right.
09:15	crocket	I'm not sure how reader monad is different from dependency injection like component.
09:15	crocket	I'll have to learn.
09:16	justin_smith	it is a form of dependency injection, but used in a different way of course
09:17	justin_smith	crocket: so the alternative to passing the logging config to every function is to use a monad which lifts every function into a thing that holds the logging config?
09:18	crocket	could be
09:18	crocket	My guess
09:18	crocket	I'll soon start learning those tools
09:19	crocket	justin_smith, What do you think is the best way to handle log config without introducing impurity?
09:19	crocket	A global var doesn't sound right
09:19	justin_smith	crocket: one problem with monads in clojure is that unlike haskell, clojure is a very naive compiler, so monads are inevitably slow because they replace the call stack with a less efficient abstraction
09:19	justin_smith	crocket: does the log config change during one runtime?
09:19	crocket	yes
09:19	crocket	justin_smith, Refer to timbre
09:19	justin_smith	then it's impure
09:19	crocket	timbre has a mutable var.
09:19	crocket	timbre has a mutable log-config
09:20	justin_smith	right, yes it does
09:20	crocket	It is even dynamic.
09:20	crocket	I currently use unilog.
09:20	crocket	logback has a similar approach.
09:20	crocket	It is worse.
09:21	crocket	Plus, monad seems to intertwine every function it touches.
09:21	crocket	Like, a phase transition.
09:21	crocket	Just like any dependency injection framework.
09:21	justin_smith	yes, once you use a monad everything using that feature has to be lifted into monad-world
09:22	crocket	justin_smith, What is your suggestion?
09:22	crocket	It is hard to avoid a global state and a global function signature change at the same time.
09:23	justin_smith	crocket: if you want something to change, and thus alter how everything works, that is a global state, no matter what fancy technique you wrap on top of it
09:24	justin_smith	so why not accept that it's global state and manage global state in a reasonable way.
09:24	justin_smith	crocket: I use timbre with the per-namespace configs
09:26	crocket	justin_smith, Just do keep in mind that the current timbre maintainer is a tyrant.
09:26	crocket	He blocks people who want changes.
09:27	crocket	How do you apply per-namespace config?
09:27	crocket	By the way, unilog maintainer is open to changes....
09:27	justin_smith	crocket: it's a documented feature of the config
09:41	cmarques	I am trying to run tests from my editor, which is connected to a repl. My tests depend on things defined in the :test environment, however the repl is running with :dev profile. Is there any way to change the current profile when I execute the tests in a test namespace? Thanks!
09:43	justin_smith	cmarques: perhaps you could create a repl using the :test profile
09:44	justin_smith	cmarques: you can't change profiles at runtime, the profile isn't a thing that exists by the time your code is loaded - it's used to create the classpath / prep tasks / etc. that are used to launch your code
09:44	justin_smith	perhaps what you want is a runtime mechanism that changes some of the things your profile is controlling?
09:44	cmarques	justin_smith yeah, I thought about it, but then I'll need two instances of my editor running, one for each profile. It would be nice if there was a way to force the profile to be :test when I load a test file, like (load-profile :test) or something
09:45	justin_smith	cmarques: what editor? emacs at least can be connected to multiple repls
09:45	justin_smith	cmarques: like I said, the profile ceases to exist by the time your code is loaded
09:45	cmarques	justin_smith I guess that's the problem, I am using Vim with vim-fireplace
09:45	justin_smith	cmarques: what about the profile is different in your repl with :test ?
09:46	cmarques	justin_smith database connection urls
09:46	cmarques	for example
09:46	justin_smith	cmarques: I'd use a mechanism that allows runtime update - look into env for example
09:46	cmarques	justin_smith cool, I'll have a look. Thanks!
09:47	justin_smith	cmarques: my typical approach is to have separate edn files for each config, and some code that loads one of the configs when bootstrapping the code
09:47	justin_smith	cmarques: then, I can still load another config at runtime, regardless of my initial config
09:48	justin_smith	this mixes well with stuartsierra/component
09:48	cmarques	justin_smith Hum... I am trying to use environ, which seems to be doing to much magic
09:48	cmarques	justin_smith looks like your approach offers more control
09:49	justin_smith	cmarques: environ is miniscule (check out the source, there's hardly anything there) - I use environ to guide loading my defaults, but have a function that can still be used at runtime
09:49	flor-bcn	sorry, got disconnected. Asking the same question again, so I have two vectors of equal size, representing questions and answers. How do I merge the two vectors into a vector of hasmaps, something like [{:question "from v1" :answer "from v2"}] ?
09:51	justin_smith	,(map merge [{:question "from v1"}] [{:answer "from v2"}])
09:51	clojurebot	({:question "from v1", :answer "from v2"})
09:52	justin_smith	or ##(map (fn [q a] {:question q :answer a}) ["from v1"] ["from v2"])
09:52	lazybot	⇒ ({:question "from v1", :answer "from v2"})
09:53	flor-bcn	justin_smith: I need each :question and :answer to come from a respective item in the vector. So first item in both vector produces {:question "my question" :answer "first answer"}, second item in both vector produces {:question "second question" :answer "second answer"}, etc
09:53	justin_smith	depending on what your input looks like
09:53	justin_smith	flor-bcn: that's what both those examples do
09:53	cmarques	justin_smith thanks for your help, I'll have a look at environ's source and see if I can come up with a way of redefining some of the values at runtime
09:53	justin_smith	,(map (fn [q a] {:question q :answer a}) ["from v1" "also from v1"] ["from v2" "also from v2"])
09:53	clojurebot	({:question "from v1", :answer "from v2"} {:question "also from v1", :answer "also from v2"})
09:54	justin_smith	cmarques: like I said it's pretty bare bones, I just use it to generate the default initial argument eg. :staging or :dev, that drives the real config
09:55	flor-bcn	v1 = ["q1" "q2" "q3"] , v2 = ["a1" "a2" "a3"] . Required result: [{:question "q1" :answer "a1} {:question "q2" :answer "a2"}....]
09:55	justin_smith	flor-bcn: that is what that code does!
09:55	justin_smith	,(map (fn [q a] {:question q :answer a}) ["q1" "q2" "q3"] ["a1" "a2" "a3"])
09:55	clojurebot	({:question "q1", :answer "a1"} {:question "q2", :answer "a2"} {:question "q3", :answer "a3"})
09:56	jaarod	hi.. if you are typed clojure user, are you using it everywhere in your new code?
09:56	snowell	Wrap it in (vec) or (into []) if you really need a vector
09:56	flor-bcn	justin_smit: you're right, thank you so much !
09:56	jaarod	or just in certain parts of your code (which?)
09:57	justin_smith	snowell: s/map/mapv for that, of course
09:57	snowell	Heh, I always forget that exists
10:10	jaarod	,(map inc "hi123")
10:10	clojurebot	#<ClassCastException java.lang.ClassCastException: java.lang.Character cannot be cast to java.lang.Number>
10:10	jaarod	,(inc '1')
10:10	clojurebot	#<RuntimeException java.lang.RuntimeException: Unmatched delimiter: )>
10:10	justin_smith	,(apply str (map (comp char inc int) "hi123")
10:10	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
10:10	justin_smith	,(apply str (map (comp char inc int) "hi123"))
10:10	clojurebot	"ij234"
10:11	jaarod	comp char inc int?
10:11	justin_smith	characters are not numbers, but "int" will return a number when given a character
10:11	jaarod	,(map (comp char inc int) "hi123")
10:11	clojurebot	(\i \j \2 \3 \4)
10:11	jaarod	I see
10:11	justin_smith	(comp char inc int) returns a function that applies int, then applies inc to the result, then finally applies char
10:12	jaarod	,(str (map (comp char inc int) "hi123"))
10:12	clojurebot	"clojure.lang.LazySeq@7ad6df1"
10:12	justin_smith	it's equivalent to (fn [c] (char (inc (int c))))
10:12	jaarod	ah
10:12	justin_smith	jaarod: apply str uses each element of the coll as an argument
10:13	justin_smith	as opposed to str which simply looks at the coll itself. Because lazy-seqs are potentially unlimited, str does not look at their contents
10:13	justin_smith	but apply gets around that
10:14	Bronsa	justin_smith: it actually realized the collection anyway :/
10:14	Bronsa	,(str (range))
10:14	clojurebot	"(0 1 2 3 4 ...)"
10:14	Bronsa	damned clojurebot
10:14	justin_smith	,(str (map pr (range)))
10:14	Bronsa	,(def a (str range))
10:14	clojurebot	#'sandbox/a
10:14	Bronsa	wat
10:14	clojurebot	eval service is offline
10:14	Bronsa	,(def a (str (range)))
10:14	clojurebot	#'sandbox/a
10:14	Bronsa	:\|
10:14	Bronsa	,clojure-version
10:14	clojurebot	{:major 1, :minor 7, :incremental 0, :qualifier "master", :interim true}
10:15	justin_smith	Bronsa: the eval service offline was in response to me
10:15	justin_smith	oh, you mean the def a returning immediately?
10:15	Bronsa	yeah
10:16	justin_smith	,(def b (map identity (str (range))))
10:16	clojurebot	#'sandbox/b
10:16	justin_smith	,(def b (str (map identity (range)))
10:16	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
10:16	Bronsa	,(def a (str (iterate inc 0)))
10:16	clojurebot	#'sandbox/a
10:16	Bronsa	wtf
10:16	Bronsa	justin_smith: well try that in your repl
10:17	Bronsa	no idea how clojurebot works
10:18	jaarod	I like comp, first time I see it
10:18	jaarod	is it a function or a macro?
10:18	Bronsa	a function
10:18	justin_smith	a function, a very nice one
10:19	justin_smith	jaarod: see also, juxt - if you like comp you'll likely like juxt too
10:19	justin_smith	,(map (juxt dec identity inc) (range))
10:19	clojurebot	([-1 0 1] [0 1 2] [1 2 3] [2 3 4] [3 4 5] ...)
10:21	Bronsa	https://groups.google.com/forum/?fromgroups=#!topic/clojure-dev/F68GRPrbfWo
10:21	crocket	justin_smith, Is it with_config that you use in timbre?
10:23	justin_smith	crocket: I misremembered, I was actually just using the :ns-blacklist feature to turn off logging in some overly chatty namespaces at runtime
10:23	justin_smith	s/runtime/dev time
10:24	justin_smith	Bronsa: yeah, clearly I thought clojure was being smarter than it actually was
10:25	justin_smith	Bronsa: I mean the intuitive thing is that if a lazy-seq is not printed readably, that's to avoid realizing it...
10:25	Bronsa	justin_smith: there's no good reason for the toString of lazyseqs to be the way it currently is :/
10:25	justin_smith	(inc Bronsa)
10:25	lazybot	⇒ 116
10:25	justin_smith	always with the facts!
10:33	crocket	I'm back.
13:06	smandy	hi I've got a java8 class that takes a lambda - can I call it from clojure? i.e is there some sugar in clojure to let me create the expected SAM implementation?
13:16	smandy	foos
14:40	arkh	smandy: i think you would do this through normal clojure<->java interop
14:49	arkh	smandy: nevermind - I just looked into it and wonder the same thing now
14:50	amalloy	you can just reify an interface
15:30	iamjarvo	if one wanted to run this snippet of code how would one go about it? http://pastie.org/private/bsmntfmjesikndoruxdksa my thought process now is i can use lein exec and execute the script or create a lein project. any thing simpler?
15:34	justin_smith	iamjarvo: java -cp <class path goes here> clojure.main -e '(load-file "path/to/that/file.clj")'
15:34	justin_smith	class path would hold any jars needed
15:34	justin_smith	if generating a classpath is complicated, then use a proper lein project and lein will do it for you
15:37	iamjarvo	justin_smith thanks
15:45	justin_smith	also, for a script, you can potentially create a project, use `lein cp` to output a classpath, and just run java directly when invoking the script
15:45	justin_smith	though uberjar might make more sense
15:51	Fare	I'm trying to reexport a var from one ns into another. That used to work, but I recently updated to 1.7.0 and it doesn't seem to work anymore
15:54	Fare	I get this error: java.lang.IllegalStateException: apropos already refers to: #'pyjure.debug/apropos in namespace: pyjure.core
16:01	justin_smith	sounds like you re-exported it already?
16:07	Fare	justin_smith, but no, I only re-exported it once
16:07	Fare	if I remove that re-export, the code loads, but the function is not exported.
16:14	xeqi	Fare: are you requiring pyjure.debug with a :refer?
16:14	wasamasa	pyjure??
16:14	lazybot	wasamasa: What are you, crazy? Of course not!
16:26	Fare	xeqi: as a :use
16:31	bcham	I'm using the monger client at http://clojuremongodb.info/ and if I don't have an instance running on my local machine, I can't uberjar my app.
16:32	bcham	For some reason the connection is being called but I don't have it in a def or anything
16:32	justin_smith	bcham: move your db connection into a function called in -main instead of doing it at the top level
16:32	justin_smith	bcham: clearly something is trying to connect while you are building, right? that means it's happening in a top level call somewhere.
16:33	bcham	justin_smith: that's what I figured it was and that's what I had done, I thought but I guess I'll double check. Just wanted to make sure there wasn't something else I wasn't thinking about.
16:33	bcham	Yeah I'm with you thank you.
16:37	bcham	Yup got it, there was just one little thing that I hadn't looked at. Thanks justin_smith.
16:37	bcham	FWIW I'd really like to thank this IRC channel, always super helpful and nice.
16:38	justin_smith	thanks, it's great to hear that
17:59	ed-g	What do people use for web-application user login?
18:03	justin_smith	ed-g stored bcrypt hash, and a signed token that the client provides with each request (so that one of the load-balanced servers can verify not only the token, but also the contents)
18:09	ed-g	justin_smith, that sounds good. did you follow a tutorial or docs to set it up, or just dive in and experiment with libraries such as Friend. I'd like to use them but I haven't found examples of working applications, it isn't clear to me which parts of the authentication I am supposed to write versus what the libraries provide.
18:10	justin_smith	ed-g: by the time I figured out enough so friend would make sense I already had my own solution
18:12	ed-g	yeah it's weird to me that no examples ever actually show a login page, or a complete web application. glad it's not just me.
18:14	ed-g	is the login portion of your application open-source, would you mind if I used it as an example?
18:16	justin_smith	not the one I'm describing, no
19:27	peat	Hello everyone. Clojure noob here. I have a pretty common pattern, but I'm not finding a clean way to address it -- most likely because I don't know what the name is. I created a gist to try and explain what I'm after. Thanks for your advice! https://gist.github.com/peat/982ad29845bfb003845b
19:32	scriptor	peat: that's an essential idea behind monads, actually
19:33	scriptor	I'm not sure what the idiomatic way to to it in clojure is
19:33	peat	scriptor: Right. :) I'm wary of using the word "monad" because strictly speaking it's not, and people get a little bent out of shape about such things. ;)
19:34	peat	scriptor: I'm tempted to spend the evening hacking on the thread-first macro to get out a proof of concept, but ... I didn't want to re-invent the wheel if it's already been done.
19:34	peat	... granted, I might do it anyway just to learn me a Clojure the hard way.
19:35	scriptor	peat: yeah, I purposely avoided saying that's what a monad was, just that it's an important idea
19:35	crazydiamond	Hi. Are there any tools for Clojure, that take e.g. two pure functions, and extract common piece of code? Or refactor it to provide maximum entropy/minimum entropy/maximum of nested levels etc, whatever applicable?
19:36	peat	scriptor: :)
19:36	scriptor	peat: https://clojuredocs.org/clojure.core/some-%3E
19:37	peat	Yes!
19:37	peat	scriptor: Thank you! I can run with that.
19:37	scriptor	peat: no prob! For future reference I just looked at the related functions of --> on clojuredocs
19:38	peat	... and it looks like there is a cond-> ... literally re-inventing the wheel over here. Haha.
19:38	amalloy	cond-> is a pretty different thing from what you asked for
19:38	peat	... although it's conditional at each step
19:38	peat	amalloy: Yup, it allows for a custom test at each form, which is pretty nifty. :)
19:39	peat	Alright, I'm a happy camper. Thanks scriptor.
21:03	arrdem	Silly question that shows how long it's been since I've touched Java... what's a good example of a class with a public static mutable field?
21:04	justin_smith	/win 8
21:06	arrdem	lols
21:10	amalloy	arrdem: System.out?
21:11	amalloy	$javadoc java.lang.System setOut
21:11	lazybot	http://docs.oracle.com/javase/6/docs/api/java/lang/System.html#setOut(java.io.PrintStream)
21:11	justin_smith	oh yeah, and the properties list exposed by System/getProperty
21:12	amalloy	i think that's not mutable without reflection cheats?
21:12	amalloy	oh, no
21:12	amalloy	setProperties indeed
21:12	justin_smith	right
21:14	arrdem	hum looks like System/out is not directly assignable
21:15	arrdem	I should probably just add a test class.
21:17	justin_smith	and System/getProperty System/getProperty is still a getter / setter pair not an exposed mutable field...
21:17	arrdem	right.
21:17	arrdem	I'm trying to test TEMJVM's mutable field setter
21:17	arrdem	test coverage was pretty bad, I've dragged it up to about 79%, trying to get it to 90.
21:34	Seylerius	There any easy way to turn 5.597661 days into a clj-time interval?
21:35	arrdem	Seylerius: do you have that number as days or are you sourcing it as milli/microsecond
21:35	arrdem	*ds
21:36	Seylerius	arrdem: I have a function that takes that number in days.
21:36	Seylerius	A math formula, rather.
21:38	Seylerius	Actually, thought of a way around it.
21:39	arrdem	That's probably for the best... I didn't want to reccomend anything with a loss of precision.
21:52	Seylerius	Okay, what's the clojurish way to take the first entry of an infinite, lazy seq that satisfies a function?
21:52	justin_smith	(comp first (partial filter pred))
21:53	justin_smith	,((comp first (partial filter even?)) [1 3 5 8 7 12 3])
21:53	clojurebot	8
21:53	Seylerius	justin_smith: That returns a transducer that eats colls?
21:53	justin_smith	it returns a function
21:53	Seylerius	Wait, yeah.
21:54	Seylerius	And that whole process is lazy?
21:54	justin_smith	not quite - when called it will evaluate items in the input until one of the items is returned by filter
21:55	justin_smith	but yeah, it is lazy enough not to consume a huge indefinite sequence
21:55	Seylerius	Lazy enough.
21:57	arrdem	You could make it lazier with memoize...