#clojure – 2016-03-02

2016-03-02

02:55	solatis	are promises/futures actually used often by clojure programmers? or is it more often core.async?
02:56	solatis	or do they complement each other?
03:00	prohobo	HAHA!
03:00	prohobo	(= is the ONLY equality operator in clojure <3
03:00	prohobo	thank god
03:01	amalloy	aside from ==, and identical?, and...
03:02	prohobo	damn it
03:02	prohobo	still better than clisp's eq eql equal equalp
03:03	tolstoy	I don't think I've ever used == or identical?, come to think of it.
03:09	amalloy	== is tough to justify. identical? is useful sometimes
03:10	prohobo	i assume identical isn't just looking for truthy/falsy but more along the lines of same address space?
03:10	prohobo	same object?
03:10	prohobo	errr form/atom
03:11	ridcully	its the java ==: object identity
03:12	ridcully	where = is along .equals
03:12	ridcully	i assume there is more to it, but thats my naive view on the world here
03:30	renl	hi in clojure destructing, i can destruct a map like [{:keys [a b c]} map1] what if I wanna destruct 2 similar maps in the same local binding like [{:keys [a b c]} map1 {:keys [a b c]} map2]?
03:31	opqdonut	don't use :keys, just normal map destructuring
03:32	opqdonut	you could use something like [{a1 :a b1 :b c1 :c} map1 {a2 :a b2 :b c2 :c} map2] if you really must
03:32	opqdonut	but I'
03:32	opqdonut	d just use (map1 :a) etc in the body
03:33	renl	thanks :D that was what i guessed but was wondering if there were some other magic i wasnt aware of heh
03:59	prohobo	clojure makes the simplest things moderately confusing
04:00	prohobo	cool
04:04	shadow6ram420	slow loris still in my search bar. :)
04:05	TEttinger	ha
04:05	TEttinger	shadow6ram420: you mentioned tech support? are you programming in clojure or just looking for tech experts?
04:06	TEttinger	there's a pretty good supply for both topics here :)
04:06	shadow6ram420	i just miss the old chris pirillo chat i used to visit
04:07	shadow6ram420	have been looking any tech community to lurk and just somthing for the second screen.
04:08	shadow6ram420	i am not a programmer but have fallowed along to a few c++ lessons.
04:12	prohobo	shadow6ram420: i recommend #ubuntu-offtopic or something akin to that
04:12	TEttinger	ah ok, yeah clojure's a good friendly community
04:12	TEttinger	that too
04:12	prohobo	if you want random discussions about computer stuff
04:13	prohobo	here we talk about dangerous mammals and clojure
04:14	prohobo	btw, what's the point of destructuring function args?
04:14	prohobo	well i can see the use for destructuring a map
04:15	prohobo	but a vector? what difference does it make
04:15	shadow6ram420	who me? i cmae here for deadly mammal chat ty tho.
04:43	TEttinger	prohobo: actually it can be quite handy
04:43	TEttinger	like you could use [10 20 30] to represent a 3d point
04:44	TEttinger	if you want to bind that to x, y, z, you could destructure to (let [[x y z] pt] ...) where pt is the above three-element vector
04:51	prohobo	TEttinger: ah i haven't gotten to let yet
04:52	TEttinger	ah, it's the same destructuring as in fn args
04:52	prohobo	i just saw something like (defn foo [[arg1 arg2 & opts]] ...)
04:52	TEttinger	ah!
04:52	TEttinger	there's a good benefit there
04:52	prohobo	and that essentially works exactly the same as (defn foo [arg1 arg2 & opts] ...)
04:53	prohobo	what's the benefit?
04:53	tdammers	it's not exactly the same
04:53	tdammers	you pass the vector as one argument
04:53	TEttinger	normally, if you wanted to pass a collection to the second kind of fn you just entered, you'd need apply
04:54	prohobo	hmmm
04:54	prohobo	i guess ill see
04:54	TEttinger	,(defn foo [a b & more] (+ a b (count more)))
04:54	clojurebot	#'sandbox/foo
04:54	TEttinger	,(foo 1 2 3 4 5)
04:55	clojurebot	6
04:55	TEttinger	,(defn bar [[a b & more]] (+ a b (count more)))
04:55	clojurebot	#'sandbox/bar
04:55	TEttinger	,(bar (range 1 6))
04:55	clojurebot	6
04:55	TEttinger	similar to
04:55	TEttinger	,(apply foo (range 1 6))
04:55	clojurebot	6
04:56	prohobo	o_o
04:56	prohobo	i cant see it
04:56	TEttinger	not sure I picked a good example
04:56	TEttinger	apply lets you turn a seq of arguments into individual args, essentially
04:56	TEttinger	,(+ 1 2 3 4)
04:56	clojurebot	10
04:57	TEttinger	,(apply + [1 2 3 4])
04:57	clojurebot	10
04:57	TEttinger	if you just did that last one without apply... not working
04:57	TEttinger	,(+ [1 2 3 4])
04:57	clojurebot	#error {\n :cause "Cannot cast clojure.lang.PersistentVector to java.lang.Number"\n :via\n [{:type java.lang.ClassCastException\n :message "Cannot cast clojure.lang.PersistentVector to java.lang.Number"\n :at [java.lang.Class cast "Class.java" 3176]}]\n :trace\n [[java.lang.Class cast "Class.java" 3176]\n [clojure.core$cast invokeStatic "core.clj" 351]\n [clojure.core$_PLUS_ invokeStatic "co...
04:58	TEttinger	if you know something is going to give you a vector or seq of some kind, you can either use apply along with a fn that takes individual args, or you can use a fn that destructures that vector or seq
04:59	TEttinger	(if you have that kind of logic where you know there's a bunch of elements, but other fns aren't a good fit like map or reduce)
04:59	prohobo	ah i see
04:59	prohobo	apply is like a split
04:59	TEttinger	yeah, similar indeed
05:00	TEttinger	it's one of the most common fns in clojure, along with map, filter, reduce...
05:00	TEttinger	I'm only mentioning the fns that take other fns as args, because they're the most useful in general
05:01	tdammers	on a related note; I wonder why function composition isn't anywhere near as popular in clojure as it is in other FP languages
05:01	tdammers	same for currying
05:01	TEttinger	tdammers: have you seen justin_smith's one-liners in here? :)
05:01	tdammers	not that I consciously remember :D
05:01	TEttinger	he's gotten some pretty good point-free style stuff working before
05:02	tdammers	yeah, but it's not a very common idiom, is it
05:02	TEttinger	and that often uses comp, juxt, and partial
05:02	TEttinger	yeah, it isn't as practical I suppose as in haskell where currying is there anyway
05:02	tdammers	e.g., in Haskell I'd write sth like: foo = apply bar
05:03	TEttinger	(partial apply bar) might come close, but I agree that it isn't as common
05:03	tdammers	yeah
05:03	TEttinger	not quite sure why
05:03	tdammers	especially not to define foo
05:03	tdammers	(def foo (partial apply bar))
05:03	TEttinger	the fns are a bit more verbose, partial instead of the implicit currying
05:04	mpenet	well, the more you write clojure code the more you tend to avoid apply in my exp.
05:04	TEttinger	mpenet: I think it largely depends on how much you control the environment too
05:04	TEttinger	if using a lib that has weird conventions, it may be more common, I'd think
05:05	mpenet	Just checked our (large'ish) codebase, 3 apply calls (on external libs that do unrolled option maps in api)
05:05	mpenet	yeah
05:05	TEttinger	woah
05:06	mpenet	on carmine too sometimes
05:07	TEttinger	I'm going to be writing a clojure wrapper for a large-ish java lib I've been writing. I haven't quite figured out cursive yet, there seems to be a bug that is normally intermittent and resolves itself but isn't for me
05:07	TEttinger	I'm pretty rusty with clojure though
05:28	tangled_z	ugh, got disconnected.
05:38	sunset-shimmer	hello!
05:39	prohobo	hello
05:42	sunset-shimmer	I've created macros that help me wrap requests to database in something like "with-connection" form. So, now I can write (def-db-cmd [fname args] (cmd args)) and it expands in (defun fname [cmd args] (with-connection conn (cmd args))). I like it, but
05:43	ridcully	sunset-shimmer: your text got cut herish: `I like it, but`
05:43	sunset-shimmer	I am Cursive user and Cursive cannot help me with autocompletion of such functions (functions that was generated with macro)
05:43	sunset-shimmer	the question is - is it possible in principle?
05:47	tangled_z	Hi guys, can anyone advice how I could add middleware to a compojure-api api?
05:50	sunset-shimmer	By "it" I mean autocompletion for such functions. May be anyone who uses Cursive too can help me?
05:53	sunset-shimmer	tangled_z: hi! Did you try did it like in this example https://github.com/metosin/compojure-api/wiki/Building-Documented-Apis#middleware
05:55	Leonidas	,@(java.util.concurrent.FutureTask. (fn [& _] 42))
05:55	clojurebot	eval service is offline
05:55	Leonidas	Any idea why this code does not terminate?
05:56	Leonidas	Calling .get on it does not work either.
06:01	amalloy	futuretask doesn't run a thing unless you ask it to
06:01	amalloy	@(doto (...) (.run))
06:07	tangled_z	sunset-shimmer: hi! thanks for replying
06:08	tangled_z	I didnt see that example before, but I tried working with it now, and am getting a bit confused about this part: (middleware [wrap-head [wrap-params {:keywords true}]]
06:08	tangled_z	sunset-shimmer: could you explain what the [wrap-head [wrap-params reffer to?
06:09	tangled_z	Im trying to put wrap-cors into it
06:09	tangled_z	but Im not sure if (wrap-cors) should replace "wrap-head" or "wrap-params" in the example
06:17	sunset-shimmer	tangled_z: I haven't used cors but it looks as you can put it in place of any. Like :middleware [wrap-cors]. I think wrap-head and wrap-params are just examples.
06:22	tangled_z	sunshet-shimmer: hmm, it keeps giving me weird errors when I try to put in my code for wrap-cors into it. would you know of any working examples of any other middleware I could have a look at?
06:31	sunset-shimmer	tangled_z: I did't know any. I can try to compose one myself if you have some time for waiting.
06:31	tangled_z	sunset-shimmer: sure! that would be nice of you.
06:32	tangled_z	Im trying to basically put the example from here https://github.com/r0man/ring-cors into the compojure-api middleware
06:34	sunset-shimmer	okay! I'll be back in a moment.
06:47	sunset-shimmer	well, http://pastebin.com/PhgqsRDS that code compiled without errors at any rate
06:47	sunset-shimmer	did you have compile time errors?
06:48	sunset-shimmer	GET http://localhost:3000/api/ping -> {"ping":"pong"}
06:50	tangled_z	sunset-shimmer: ooh that made progress,thanks! no compile errors
06:50	sunset-shimmer	but if we need params like in example... http://pastebin.com/ixhEkKyH that gives error!
06:51	tangled_z	yeah i was about to say, i just tried that
06:51	tangled_z	:(
06:51	tangled_z	any idea why?
06:53	sunset-shimmer	not yet. but lets try to replace vector with lambda.
06:54	tangled_z	hmm
06:55	sunset-shimmer	http://pastebin.com/ZSaf9qfP
06:55	sunset-shimmer	like here
06:56	tangled_z	oooh no errors!
06:56	sunset-shimmer	great!
06:56	tangled_z	:D
06:56	tangled_z	let me see if this works for data transfer
06:56	sunset-shimmer	yes
06:57	sunset-shimmer	I mean, let's go.
06:59	tangled_z	Ok, hmmm... Nope. chrome still says that cross origin requests are not supported
06:59	Empperi	you can do that with CORS
07:00	Empperi	but yeah, it still says that and will always say that
07:00	Empperi	thank god
07:01	tangled_z	Empperi: what do you mean?
07:01	tangled_z	Im trying to use cors and it's not working. I cant figure out where the problem is.
07:02	Empperi	CORS is a slightly tricky beast which requires multiple pieces to be put together to make it work
07:02	Empperi	unnecessarily many imho
07:02	tangled_z	Empperi: yeah it is always a pain for me. :( Struggled with it when I was learning django an
07:02	tangled_z	and now again with clj
07:02	Empperi	https://www.refheap.com/52e1ce4a5a560301a3d952909
07:03	Empperi	that's what you need on the server side
07:04	Empperi	after that it should be relatively straightforward
07:05	Empperi	when you try to make a cross domain request browser first sends an OPTION request
07:06	Empperi	then it'll receive those headers and find that the domain it is currently sitting on is declared at Access-Control-Allow-Origin:
07:06	Empperi	after that you can make the XHR request to that domain
07:06	Empperi	oh and yeah, that "Auth" header part: specific to our app :)
07:07	Empperi	but generic enough
07:07	Empperi	it's a bit tedious since you need to list every HTTP method you like to use and every HTTP header
07:07	tangled_z	Empperi: thanks a lot for the code and explanation!
07:07	tangled_z	Erm
07:07	tangled_z	Though
07:08	tangled_z	It's more low level than what Im working with, Im not sure how to connect it with my own code.
07:08	tangled_z	Would you have a use-example?
07:08	Empperi	unfortunately no, this is a closed source project
07:08	Empperi	but you pretty much need to add that stuff into HTTP responses sent from the server
07:09	Empperi	after that browsers will handle everything else automatically
07:09	Empperi	so you can just make a GET request or whatever and browser will under the hood make that OPTION request
07:09	tangled_z	Ohhhh, I see!
07:09	tangled_z	and so the "host" is the host that I am allowing the connection to?
07:09	Empperi	but of course you need to handle that OPTION request :)
07:10	Empperi	yeah
07:10	Empperi	that is the host which is serving the javascript trying to make the cross domain XHR request
07:11	Empperi	if you're serving that js from eg. https://foo.com and making a cross domain request to https://bar.com then the OPTION responses from bar.com should declare foo.com as allowed host
07:11	tangled_z	What do you mean by "handling the option request"? will that not be done automatically?
07:11	Empperi	depends on your application
07:12	Empperi	but OPTIONS is a HTTP request just like GET is
07:12	Empperi	let's say you're trying to make GET https://bar.com/api/save-the-world
07:13	Empperi	browser will first call OPTIONS https://bar.com/api/save-the-world
07:13	Empperi	and checks if the appropriate CORS headers are in place and if a) current host is allowed to make requests b) if GET method is allowed
07:13	Empperi	if both match then it proceeds to make the original GET request
07:14	Empperi	so, if you don't have a proper http request mapping for OPTIONS /api/save-the-world then the caller side will not receive the CORS headers and it will not work
07:14	Empperi	the easiest way to handle this is to make a universal OPTIONS mapping which receives all OPTIONS requests
07:15	Empperi	and just return the headers
07:15	Empperi	the reason why it is like this is that there might be a scenario where one would want to limit cross domain requests per URL
07:16	Empperi	so in essence when your javascript calls any cross domain URL it'll first do that OPTIONS call - always
07:16	Empperi	so you'll end up doubling your XHR requests
07:16	tangled_z	Empperi: Ahh yes, that makes sense!
07:17	Empperi	so make damn sure your OPTIONS handler is lightning fast, meaning it doesn't do any additional stuff :)
07:17	Empperi	we created a middleware for that
07:18	Empperi	it rules out using OPTIONS within our application in route mappings but that shouldn't be a problem
07:18	sunset-shimmer	I should save your conversation for the future use...
07:19	tangled_z	so that means you can't use cors?
07:19	Empperi	sure you can use it
07:19	tangled_z	sunset-shimmer: Oh, I always save helpful conversations :)
07:19	Empperi	it just makes stuff slightly slower
07:20	tangled_z	Hmm. But if you need OPTIONS to pass cors, and you've disabled OPTIONS using the middleware.. hmm.. I am a bit confused!
07:20	Empperi	we can't do OPTIONS mappings within our application if the middleware stops those requests and handle those itself
07:20	sunset-shimmer	tangled_z: did you test it at localhost? Chrome doesn't support localhost for CORS
07:21	Empperi	yes, that is an additional hassle, forgot that
07:21	Empperi	but you can tell chrome to accept those
07:21	Empperi	it's ok for development
07:22	tangled_z	Wait what
07:22	tangled_z	Yeah I tested it with chrome -_-
07:27	Empperi	anyway, I need to do some work :)
07:27	Empperi	hope that clarified a bit
07:27	tangled_z	Alright! Thanks for the advice! :)
07:27	tangled_z	Yeah that was a massive help :)
07:27	Empperi	CORS is pretty complex beast but security stuff tends to be :P
07:27	tangled_z	Yeahh it makes sense why
07:28	tangled_z	Just a paaaaain atm
07:28	Empperi	indeed
07:28	tangled_z	Spent far far longer on it than id want to
07:28	amoe	I'm finding the auto-reloading functionality of "lein ring server" to be very flaky, as in it doesn't notice changed files half the time, and I can't figure out why
07:28	Empperi	we had to do CORS requests since we had to serve our app on HTTP (don't ask) but we still wanted to make all our XHR requests with HTTPS
07:28	Empperi	and that equals as cross domain request for browsers
07:29	tangled_z	That sounds frustrating
07:29	tangled_z	All I'm doing is trying to communicate between localhost:3000 and localhost:3994 at the moment!
07:32	sunset-shimmer	amoe, me too
07:33	tangled_z	Oh my god WHAT
07:34	tangled_z	It was a typo on the f'cking client the entire time
07:34	tangled_z	God damn it.
07:34	tangled_z	Ok, thanks for the help sunset-shimmer and Empperi. (At least now I know about middle-ware and headers more in depth)
07:35	sunset-shimmer	you are welcome!
07:35	tangled_z	:D
07:35	tangled_z	Yeah it was helpful.
07:35	Empperi	lol
07:35	tangled_z	I am so annoyed with myself right now. Like, I was so convinced that "CORS is difficult so I MUST have made the mistake on the server" that I never double checked the client-side stuff
07:41	amoe	Why would someone write "(let [] (some-expr))"? what use is a let without any bindings?
07:42	opqdonut	amoe: well you can use (let [] ...) instead of (do ...) to turn multiple expressions into one
07:42	opqdonut	amoe: but yeah, let [] doesn't make much sense
07:42	Empperi	but it's just stupid to do it like that
07:43	Empperi	I didn't even know that compiles :)
07:43	sunset-shimmer	lol
07:43	opqdonut	well it's nice for macro-writing that you can have empty lets
07:43	opqdonut	and empty dos
07:43	opqdonut	etc
07:45	Empperi	true, with macros empty let can make sense
07:46	Empperi	one doesn't have to handle the special case then
12:28	morbid_ape	hi everyone
12:28	morbid_ape	burn all jews in oven
12:28	morbid_ape	death to infidel
12:28	morbid_ape	allahu akhbar
12:35	phillord	Is there a syntax for getting a short int in Clojure?
12:37	Bronsa	phillord: there's no real short type in the JVM
12:37	morbid_ape	Bronsa you filthy jew
12:37	Bronsa	only int/long exist at the VM level
12:37	morbid_ape	burn in oven you foul jew
12:37	morbid_ape	death to infidels
12:37	morbid_ape	you foul infidel
12:37	Bronsa	puredanger: ping
12:38	phillord	Bronsa: learn something every day!
12:39	morbid_ape	allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!!
12:39	demophoon	ops?
12:39	Bronsa	amalloy_:
12:55	justin_smith	phillord: it is possible to put a short into a ByteBuffer though
12:55	morbid_ape	allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!!
12:55	morbid_ape	allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!!
12:55	justin_smith	(or the universally agreed representation of one)
12:55	morbid_ape	4allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!!
12:56	phillord	justin_smith: true -- I guess I am not worried about performance here, though. Really I just need a range which is smaller than int. There are probably better ways to do this, now that I think more clearly
12:56	justin_smith	phillord: you could just use bitwise-and
12:57	justin_smith	,(doc short)
12:57	morbid_ape	bitwise operators are for infidels
12:57	morbid_ape	death to infidels
12:57	clojurebot	"([x]); Coerce to short"
12:57	justin_smith	,(short 32768)
12:58	clojurebot	#error {\n :cause "Value out of range for short: 32768"\n :via\n [{:type java.lang.IllegalArgumentException\n :message "Value out of range for short: 32768"\n :at [clojure.lang.RT shortCast "RT.java" 1153]}]\n :trace\n [[clojure.lang.RT shortCast "RT.java" 1153]\n [sandbox$eval47 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval47 invoke "NO_SOURCE_FILE" -1]\n [clojure.lang.Compiler eval "Co...
12:58	justin_smith	,(short 32767)
12:58	clojurebot	32767
12:58	morbid_ape	CLOJURE IS INFIDEL PROGRAMMING LANGUAGE
12:59	justin_smith	,(type (short 1)) ; haha
12:59	clojurebot	java.lang.Short
12:59	justin_smith	oh wait, in my repl at home that returns java.lang.Long
12:59	justin_smith	the plot thickens!
13:00	rcassidy	weird, i get Short
13:00	rcassidy	,(clojure-version)
13:00	clojurebot	"1.8.0"
13:00	justin_smith	rcassidy: never mind, PEBKAC on my end
13:00	rcassidy	ha, gotcha
13:00	justin_smith	so yeah, it does return a Short
13:01	morbid_ape	SIEG HEIL
13:01	morbid_ape	HEIL HITLER
13:02	justin_smith	Bronsa's info is usually good, so I wonder what's going on there - the official docs mention short as a primitive and Short as a class https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
13:02	WorldsEndless	How to relative paths work in a project? If I specify a file at "resources/myfile.docx" where is it actually going to look relative to my application dir?
13:02	justin_smith	WorldsEndless: it depends who is looking
13:02	justin_smith	WorldsEndless: many lookups are classpath relative
13:02	justin_smith	but some are file system relative
13:02	justin_smith	the latter is very prone to breaking in deployed code though
13:03	WorldsEndless	Sounds like a messy problem...
13:03	WorldsEndless	How can I reliably reference files shipped with my app?
13:03	justin_smith	WorldsEndless: the best practice is that unless you specifically need something that is on disk, use classpath relative lookup
13:03	justin_smith	WorldsEndless: use clojure.java.io/resource and that returns something as found on the classpath
13:04	morbid_ape	sieg heil
13:04	justin_smith	your resources and your source dirs are all on the classpath, both at dev time and when running from a jar
13:04	morbid_ape	4allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!! allahu akhbar!!!!
13:05	WorldsEndless	justin_smith: So are you saying that a resources/myapp.docx call will check in each location until it finds a matching one, or not?
13:06	justin_smith	WorldsEndless: I'm saying that if you have a file in resources/myapp.docx and resources in in your resources-path (which is the default in lein) then (io/resource "myapp.docx") will find that as a readable resource as runtime
13:07	justin_smith	WorldsEndless: note it will give you something you can read from, but not a file- because things inside jars are not yet files
13:07	justin_smith	(at deploy time that is)
13:07	WorldsEndless	I don't see a :resources-path specified in my project.clj, so I guess it just checks project/resources ?
13:07	rhg135	Usually url
13:07	justin_smith	but you can slurp it or send it via a ring handler or whatever
13:07	justin_smith	WorldsEndless: the default is resources
13:08	justin_smith	WorldsEndless: in a repl, try io/resource - you should get a non-nil return value for things in your resources directory, and they will be included in an uberjar
13:09	justin_smith	and the point of io/resource is it works the same, whether in a repl with files on disk or in a java process with files inside the same jar
13:10	WorldsEndless	Ah! I see. beautiful
13:25	cortexman	is there a version of conj that preserves the order of the arguments?
13:26	cortexman	maybe i just need to reverse the order of my arguments
13:26	cortexman	i'm doing conj on a bunch of dicts, and the last one comes first
13:27	justin_smith	cortexman: it has nothing to do with conj, hash-maps do not preserve order
13:27	cortexman	i need a vector of maps that are in a certain order
13:27	justin_smith	and vectors always conj to the end, and lists always conj to the beginning
13:27	cortexman	i see.. hmm..
13:28	cortexman	ah.
13:28	justin_smith	so by picking between () and [] as your starting value, you should get the order you want, right?
13:28	morbid_ape	YOU ARE A FILTHY HOMOSEXUAL JUDEN ANIMAL PERPETRATOR
13:28	cortexman	yep
14:03	@amalloy	oh, he left already
15:40	Shayanjm	So I have (yet another) optimization question. I need to perform a transformation as efficiently as reasonably possible - essentially taking a list of 'filters' with their owners attached, and turning it into a list of owners with their filters attached
15:41	Shayanjm	here's a direct example of the input/expected output: https://gist.github.com/shayanjm/2f731644ffd964df6961
15:41	Shayanjm	I could trivially build the output using a bunch of nested loops but was wondering if anyone had anything more performant/elegant in mind?
15:52	wgator	list T>1
15:52	wgator	\list T>1
15:58	TimMc	Shayanjm: One reduce and a map oughtta do it.
16:04	justin_smith	TimMc: or a transduce with a map transducer, since efficiency was mentioned after all
16:11	TimMc	...I still haven't tried out transducers.
16:22	amalloy	isn't Shayanjm's problem just "implement group-by"?
16:26	Shayanjm	exactly amalloy
16:26	amalloy	so, why implement group-by instead of using group-by?
16:41	justin_smith	amalloy: I'd say it's more three filters in a vector, maps show up in more than one of the outputs, I don't see how that can be done with group-by?
16:42	amalloy	i see. i hadn't noticed that part
16:43	amalloy	i guess i would say, how sure are you that performance matters here? start with the really dumb thing of like (apply merge-with into (for [filter filters, user (:users filter)] {user [filter]})) and see what happens
16:44	amalloy	(this is way more trivial than "a bunch of nested loops")
16:47	justin_smith	yeah, that actually looks close to the answer
16:51	amalloy	well it's a correct solution. whether it's fast enough is one Shayanjm can measure
16:52	justin_smith	{:user-id user :filters [filter]} but sure
16:54	boom	could i trouble someone for help with an error?
16:55	justin_smith	boom: you can always just go ahead and describe the error, but if you need to share more than one line of code, or a stack trace, use a paste site
16:55	boom	ok, I don't think it will take too many lines to describe
16:56	boom	I have a compojure application, and when attempting to build an uberjar, it gives me an error
16:56	boom	Compiling myapp.routes Uberjar aborting because jar failed: clojure.lang.MapEntry cannot be cast to clojure.lang.IPersistentMap
16:56	justin_smith	boom: what that means usually is that you provided a single map where it wanted a sequence of maps
16:56	boom	I've looked at myapp.routes, and the file seems to be fine, but I'm not sure if the error that 'lein uberjar' gives is related to the previous file or not
16:57	boom	I'll double check
16:57	justin_smith	boom: does the app actually run outside the uberjar context, if you just use lein run or whatever?
16:57	boom	yes it runs fine
16:58	justin_smith	,(def filters [{:data "DATA1" :name "NAME1" :users #{1 2 3} :url "URL1" :title "TITLE1"} {:data "DATA2" :name "NAME2" :users #{1 3} :url "URL2" :title "TITLE2"}])
16:58	clojurebot	#'sandbox/filters
16:58	justin_smith	,map (fn [[n fs]] {:user-id n :filters fs}) (sort (apply merge-with into (for [filter filters user (:users filter)] {user [filter]}))))
16:59	clojurebot	#object[clojure.core$map 0x4a52f74d "clojure.core$map@4a52f74d"]
16:59	justin_smith	,(map (fn [[n fs]] {:user-id n :filters fs}) (sort (apply merge-with into (for [filter filters user (:users filter)] {user [filter]}))))
16:59	clojurebot	({:user-id 1, :filters [{:data "DATA1", :name "NAME1", :users #{1 3 2}, :url "URL1", :title "TITLE1"} {:data "DATA2", :name "NAME2", :users #{1 3}, :url "URL2", :title "TITLE2"}]} {:user-id 2, :filters [{:data "DATA1", :name "NAME1", :users #{1 3 2}, :url "URL1", :title "TITLE1"}]} {:user-id 3, :filters [{:data "DATA1", :name "NAME1", :users #{1 3 2}, :url "URL1", :title "TITLE1"} {:data "DATA2", ...
17:03	Shayanjm	looks great, thanks for your help both justin_smith & amalloy
17:12	boom	ok so I commented out the entire file except for a single route definition, and I'm still receiving the same error from 'lein uberjar'
17:14	TimMc	boom: Maybe post it on a pastebin.
17:18	amalloy	why would you call sort on a map like that? just build a sorted map to begin with. (apply merge-with into (sorted-map) (for ...))
17:19	cortexman	i am getting Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: :db.error/not-a-data-function Unable to resolve data function: :db/id when i try to transact this: [{:db/id #db/id[:db.part/ some-part] :some/id someval}]
17:19	cortexman	driving me mad
17:20	tolstoy	Maybe try (d/tempid :some-part) instead of the reader macro thing?
17:22	cortexman	tolstoy, no difference
17:22	cortexman	does it matter that i have a vec of hashmaps
17:23	tolstoy	I'm not sure. Got a paste with the full function call?
17:24	tolstoy	@(d/transact conn [{:db/id (d/temp-id :part) :user/id (d/squuid) :user/name "Ezzie Boof"} {:db/id (d/temp-id :part) :org/name "Dance Club"}])
17:24	tolstoy	That sort of thing works for me all the time.
17:25	tolstoy	Unless I 1) forget the vector, or 2) use an incorrect value for "conn", or 3) forget the conn parameter.
17:30	cortexman	the error message is just so inscrutable
17:30	cortexman	as far as i can tell, i'm doing what you pasted
17:31	tolstoy	Hm. Maybe I can fire up an app here and see if I can reproduce it.
17:33	cortexman	i'm going to keep hacking on it
17:41	amalloy	so i'm having a problem editing this macro: https://gist.github.com/amalloy/76a82d8f736afcb9ccd8 - it's a simplified version of my real problem, but the issue that i can't seem to get metadata on the list `(force ~delay-sym). you can see what i mean via: (set! print-meta true) (macroexpand-1 '(let-later [^String foo "test"] (.length foo)))
17:42	amalloy	wait never mind, somehow when i wrote it out like that it totally works. what was i doing before that is not working. brb
17:42	justin_smith	amalloy: as an aside, I'm fascinated to see force
17:42	justin_smith	,(force 1)
17:42	clojurebot	1
17:43	justin_smith	,(force (delay 42))
17:43	clojurebot	42
17:43	justin_smith	cool!
17:43	justin_smith	I always just used deref on delays but that's super handy
17:44	tolstoy	Thinking it makes things clearer?
17:44	justin_smith	tolstoy: yeah, and also it's handy that force on non-delayed things works
17:44	tolstoy	Ah, ok.
17:45	amalloy	~justin_smith is fascinated by force
17:45	clojurebot	Ik begrijp
17:50	amalloy	sigh. now it works perfectly, but it does me no actual good because clojure.tools.macro discards the metadata i went to all the trouble of putting on my forms
18:48	eeepc	i just want to get kicked out of a bunch of channels
18:48	eeepc	why is no one cooperating??
18:48	eeepc	#trump2016
18:48	eeepc	cant stump the trump
18:48	eeepc	cant stump the trump
18:48	eeepc	cant stump the trump
18:48	eeepc	cant stump the trump
18:48	eeepc	cant stump the trump
20:30	renl	is there a way for filter to produce 2 vectors one which pass the condition and one that does not
20:30	renl	as opposed to doing filter twice with inverse conditions
20:31	renl	oh partition-by i answered my own question heh
20:41	amalloy	that's not what partition-by does
20:44	amalloy	,(partition-by even? (range 6))
20:44	clojurebot	((0) (1) (2) (3) (4) ...)
20:46	pilne	ok, now this time i won't fubar my smeggin install by futzing around with too many languages >.< can i get an a-men?