#clojure – 2015-06-16

2015-06-16

00:06	Surgo	all the destructuring docs I see for maps use keywords for the keys; is there a doc that shows destructuring where the map keys aren't keywords?
00:08	oddcully	Seeq: :strs and :syms in the special forms page
00:09	oddcully	erm sorry
00:09	oddcully	Surgo: http://clojure.org/special_forms :strs and :syms
00:11	Surgo	thanks!
00:19	WickedShell	I've found update-proxy on clojure docs, which looks to fit my need. But is this really considered the correct way to change a single function within a library? (IE the library has a very long proxy and I only need to modify one of the functions)
03:49	lvh	If I just want to execute a list of side-effecting functions, (doseq [f fs] (f)) is the idiomatic pattern, right?
03:50	lvh	That seems more idiomatic than the alternative (dorun (map apply fs))
03:51	amalloy	does (apply f) even work? i didn't think so
03:51	amalloy	,(apply +)
03:51	clojurebot	#error {\n :cause "Wrong number of args (1) passed to: core/apply"\n :via\n [{:type clojure.lang.ArityException\n :message "Wrong number of args (1) passed to: core/apply"\n :at [clojure.lang.AFn throwArity "AFn.java" 429]}]\n :trace\n [[clojure.lang.AFn throwArity "AFn.java" 429]\n [clojure.lang.RestFn invoke "RestFn.java" 412]\n [sandbox$eval25 invoke "NO_SOURCE_FILE" 0]\n [clojure.lang.C...
03:51	amalloy	no, it doesn't
03:52	lvh	oh, I guess that makes the choice even easier then
03:52	lvh	that seems like an obvious degenerate case for apply though
03:52	lvh	even though the verb doesn't make as much sense anymore since you're not applying it to anything
04:43	TMA	,(funcall +)
04:43	clojurebot	#error {\n :cause "Unable to resolve symbol: funcall in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: funcall in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: funcall i...
04:44	TMA	yea, no need for funcall in lisp-1
04:44	TMA	,(let [f +] (f))
04:44	clojurebot	0
04:49	profil	,(*)
04:49	clojurebot	1
04:49	TMA	,1+
04:49	clojurebot	#<NumberFormatException java.lang.NumberFormatException: Invalid number: 1+>
04:51	TMA	well, that explains the choice of inc instead of 1+
04:51	TMA	,(= 'a 'a)
04:51	clojurebot	true
04:51	TMA	,(= 'a 'A)
04:51	clojurebot	false
04:52	profil	TMA: clojure does not have currying, multi arity
04:53	profil	,(source +)
04:53	clojurebot	Source not found\n
04:55	TMA	profil: Sorry, I do not understand what you are trying to say.
04:55	profil	,(partial + 1)
04:55	Empperi	currying in clojure would be: ##(let [almost-curried (partial + 1)] (almost-curried 1))
04:55	clojurebot	#object[clojure.core$partial$fn__4525 0x64192b7e "clojure.core$partial$fn__4525@64192b7e"]
04:56	profil	Empperi: yes :)
04:56	Empperi	bah, I never remember the inline code example syntax for clojurebot
04:56	Empperi	it was something like that
04:57	Empperi	anyway, that is not real currying
04:57	Empperi	it's something very similar but it's not currying
04:57	TMA	common-lisp:1+ is the function that adds one to its argument -- hence the equivalent of clojure.core/inc
04:57	TMA	what I was testing was whether 1+ is a valid symbol name
04:57	Empperi	well, clojure has several other naming conventions which differ from common lisp
04:58	Empperi	first, rest vs car, cdr and so forth
04:58	TMA	first and rest are there in CL too :
04:58	Empperi	but car cdr is not in clojure
04:59	Empperi	they've been slowly renamed by lisp community over the decades
04:59	Empperi	the original were pretty aptly named considering what they actually did
04:59	Empperi	but current implementations of eg. clojure have nothing to do with that
04:59	Empperi	they just happen to solve the same problem
05:01	TMA	yes, clojure being a lisp-1, its users might appreciate that they can use car as a variable name for holding vehicle data without shadowing the list destructuring primitive
05:02	Empperi	hehe
05:03	TMA	which unfortunately does not extend to the ability to name the list parameter list in a generic list utility function
05:04	profil	Empperi: no currying is like "(+1) :: Int -> Int", written i haskell. Which clojure does not have due to multi arity?
05:05	Empperi	profil: I know what currying is
05:05	Empperi	and multi-arity does complicate things
05:05	TMA	,(let [+ *] (+))
05:06	clojurebot	1
05:06	Empperi	but this comes to the same discussion as with recur and TCO
05:06	Empperi	when it comes to recur I actually prefer the way it's in clojure
05:07	Empperi	when talking about currying I'm not sure
05:07	profil	prefer to what?
05:07	Empperi	prefer to automatic TCO
05:07	Empperi	like it's in haskell and in so many other languages
05:07	Empperi	although in Haskell automatic TCO is less hazard since the whole language is lazy
05:08	TMA	what hazard it is?
05:08	Empperi	I like the fact that clojure compiler tells me if something can be tail call optimized
05:08	Empperi	and that I can't by accident make a normal recursive call when I meant it to be TCOd
05:09	Empperi	the additional "recur" is minimal overhead and actually provides better readiblity too imho
05:09	Empperi	the whole discussion with currying and partial is similar
05:09	TMA	I do not concur.
05:09	Empperi	but there true currying would be more useful
05:10	TMA	The recur is a stopgap measure.
05:10	Empperi	so like I said, I wouldn't mind true currying in Clojure but I'm fine with current implementation too
05:11	j-pb	currying breaks varargs
05:11	Empperi	yup, also mentioned above :)
05:11	j-pb	ah yeah sorry
05:11	TMA	it shifts the burden of doing TCO from the machine to the programmer. And frankly it's the programmer's mind capacity that is the limiting factor these days.
05:12	j-pb	well varargs are such a big part of clojure that I don't think curring would work
05:12	Empperi	TMA: maybe but at the same time I've seen bugs in TCOd languages where the programmer had thought the compiler would take care of the optimization but he had by accident caused a regular recursion
05:13	Empperi	with Clojure you can't do that bug
05:14	TMA	Empperi: could you provide me with an example of such a situation?
05:14	Empperi	usually bugs like that occur when you modify existing code which had been TCOd and after your modifications it isn't
05:14	Empperi	TMA: any recursion call which isn't in tail call position
05:15	Empperi	even more easy with mutual recursion
05:15	TEttinger	Empperi, you totally can in clojure, by using recursion without using loop
05:15	Empperi	to do that bug
05:15	TEttinger	thankfully we have loop :)
05:15	TMA	Empperi: I seek the example, that would be avoided in clojure.
05:15	Empperi	TEttinger: hmm? That's what I said? That if you use 'recur' compiler tells you if your making the call from non tail position?
05:16	Empperi	sure you can blow the stack by normal recursion but then you're not using recur
05:16	TEttinger	yeah, I mean something like... that, yes
05:16	TMA	ah
05:16	TMA	now I see
05:16	TEttinger	if someone assumed clojure had TCO, that would be silly, but would soon blow the stack
05:16	Empperi	yup
05:16	TEttinger	I do think explicit recur makes sense
05:17	Empperi	indeed
05:17	Empperi	in the beginning I thought it was a dumb idea but these days I think it is better than automatic TCO
05:17	TEttinger	I think clojure's emphasis on preferring map, reduce, filter, etc. and combinations of them makes even more sense
05:17	TMA	recur contains an assertion "I am called in tail position" and the compiler checks that
05:17	Empperi	TMA: yeah
05:17	Empperi	since then compiler can be sure you really wanted tail call optimization
05:18	Empperi	while with automatic TCO compiler can't make such assumptions
05:18	TEttinger	also, recur I believe is very handy in translating to better bytecode instructions, though I'm not sure
05:18	Empperi	anyway, partial isn't equal to recur but it is it's distant relative :)
05:19	Empperi	there too you tell explicitly to the reader that you are currying the function
05:19	TEttinger	(I believe a call to loop can compile down to approximately the same bytecode as java's for or foreach loop, though I don't know which)
05:19	Empperi	while with true currying you have to know the function being curried that how many arities it has
05:19	Empperi	that will it call the function or just create a new one
05:19	TMA	I can envision (declare (tail-call)) or some other marking that would permit the check that in other languages
05:20	Empperi	TMA: yes, and such things do exist
05:20	Empperi	eg. in scala
05:20	TEttinger	but the JVM still lacks TCO even there
05:20	Empperi	yup
05:20	Empperi	it's done completely on the compiler
05:20	Empperi	if it's done at all
05:24	TMA	lack of support for TCO in JVM is one of my pet peeves. it prevents me to use my usual recursive programming style in Java. It makes me reconsider and rewrite in an inferior way (in a readability sense)
05:25	Empperi	well, in Java we have this thing called for loop for TCO (troll)
05:25	Empperi	I seriously think that IRC needs a trollface emoticon
05:30	j-pb	wh not have both? :D
05:30	r4vi	so I might have to write some Java soon (holdme)
05:49	dysfun	Empperi: no, in that sense defn would also be TCO. ITYM 'recur' :)
06:04	kaiyin	(defn- expired? [[id session]] (pos? (- (:ring.middleware.session-timeout/idle-timeout session) (current-time)))) Shouldn't it be neg? here?
06:04	kaiyin	current-time is always increasing.
06:09	TMA	Empperi: yes, indeed. [response in re: IRC emoticon need]
06:11	kaiyin	Anyways this is a clj file generated by `lein new luminus`, should I file a bug report somewhere?
06:18	kaffeeboehnchen	Anyone who can help me with http-kit? I can start the server without an error but not connect :( https://paste.xinu.at/m-AByN/
06:18	TEttinger	kaiyin: I'd assume it's because it's a check for expiration, and (:ring.middleware.session-timeout/idle-timeout session) returns a larger number if it has timed out, but I'd verify the behavior is wrong first
06:19	TEttinger	kaiyin, sure seems weird, but it may have a reason
06:20	kaiyin	TEttinger: ok, I am not in a hurry, :-), just learning stuff.
06:22	TEttinger	kaiyin, there's a lot I'm not sure about there, is that copied from somewhere online and link-able?
06:23	TEttinger	in particular, I may have the wrong middleware I am looking at: https://github.com/ring-clojure/ring-session-timeout/blob/master/src/ring/middleware/session_timeout.clj
06:23	kaiyin	TEttinger: no, but if you run lein new luminus myapp, and check myapp/src/hipstr/session.clj , you should see the same.
06:24	marbetschar	Hi @all! Are there any good Datomic ressources out there for start playing with it?
06:25	kaiyin	sorry, it's myapp/src/myapp/session.clj , but you probably got it.
06:27	TEttinger	ohhhhh that's why it's so weird...
06:27	TEttinger	,(:ring.middleware.session-timeout/idle-timeout {:ring.middleware.session-timeout/idle-timeout 42})
06:27	clojurebot	42
06:28	TEttinger	it's getting that key from session, not actually calling a fn on session
06:28	TEttinger	the ket being :ring.middleware.session-timeout/idle-timeout
06:28	TEttinger	why it is called that, no idea
06:30	TEttinger	so that key is probably being set to when the session expires, as a number in seconds since the date/time that 0 is (january 1st 1970 I think)
06:30	TEttinger	meaning it expires in the future, unless the current time has caught up
06:31	TEttinger	naming is weird though, I think it's being used to test that things haven't expired?
06:32	kaiyin	TEttinger: than I imagine it should be named not-expired?
06:32	TEttinger	it's private, so I guess it doesn't matter. it's only used in one place
06:32	kaiyin	alright.
06:33	TEttinger	ah, yeah, it is weird but
06:33	TEttinger	(clojure.core/swap! mem #(->> % (filter expired?) (into {}))))
06:35	TEttinger	that takes mem, which is an atom that will contain a map of ids to sessions, and replaces its value with all id/session pairs that expired? returns true for, then sticks those back in a map and makes that the new mem
06:36	TEttinger	expired? returns true if the time the session expires is later than the current time
06:36	TEttinger	so it is taking out any sessions that have expired, because those returned false
06:36	TEttinger	it could definitely be clearer if they used neg? and remove or made it alive? instead of expired?
06:37	kaiyin	TEttinger: yeah.
06:38	TEttinger	and the keyword with a / is just bizarre...
06:39	TEttinger	it looks like that's all meant to be close to internal only, so I guess if it hasn't needed changing they haven't changed it
06:43	kaiyin	Could anyone help me understand this error? https://gist.github.com/kindlychung/c4571765ab3c07e3533e
06:45	kaiyin	If I have modified some clj file after starting lein ring server, what should i do to make this modification take effect?
06:46	mmeix	restart the server (I guess)
06:48	mmeix	Compojure has "wrap-reload"
06:51	kaiyin	thanks.
06:52	mmeix	sorry... Ring I meant
06:53	mmeix	https://ring-clojure.github.io/ring/ring.middleware.reload.html
06:56	oddcully	isn't namespacing this map key there actually a nice thing to do?
06:57	mmeix	you mean :dirs ?
06:57	oddcully	i meant :clojure/TEttinger ;P
06:58	mmeix	ah, ok
06:58	mmeix	(brain in economy drive here)
06:58	TEttinger	oddcully, i didn't know that namespaced it, since / doesn't namespace normally...
07:04	Bronsa	TEttinger / in symbols and keywords is only allowed once and precisely to namespace it
07:04	Bronsa	and it's not uncommon at all
07:13	mskoud	Is there a way to call a function when using deconstruction. I'm using something like (defn route-erp-customer [{{id :id} :params :as req}] , but id i a string and i would like to convert it to an int...
07:20	sdegutis	Is Clojure suitable for parsing a pretty well structured HTML file?
07:24	J_A_Work	sdegutis: This should do nicely: https://github.com/davidsantiago/hickory
07:24	sdegutis	I LIKE!
07:25	sdegutis	lemme try it on my doc
07:26	J_A_Work	Also this; fewer features, but might work fine if all you want is hiccup results. https://github.com/nathell/clj-tagsoup
07:26	J_A_Work	<3 hiccup
08:04	pandeiro	anyone know how I can get liberator to return an image resource (eg image/jpeg)? I've put "image/jpeg" in the :available-media-types but when I try to retrieve the resource, I get 'org/apache/commons/compress/archivers/StreamingNotSupportedException' as a response
08:07	pandeiro	(in :handle-ok I'm returning (ring-response {:status 200 :headers {"Content-Type" mime-type} :body (io/input-stream image-bytes)}) ... thinking liberator should support input streams)
08:12	wombawomba	What's the easiest way to make ring log all requests to stdout?
08:12	pandeiro	wombawomba: easiest imo would be a middleware fn that does a println
08:12	Empperi	guess I'd make a middleware
08:12	Empperi	yeah
08:12	wombawomba	I figured I'd use https://github.com/pjlegato/ring.middleware.logger , but it seems to use https://github.com/pjlegato/onelog , and making that log to stdout seems complicated
08:12	Empperi	(defn logging-mw [handler] (fn [request] (println request) (handler request)))
08:13	Empperi	that's it, just add that to your ring handler
08:13	tdammers	how about timber
08:13	tdammers	doesn't that do what you need?
08:13	pandeiro	timbre yeah has more advanced features, prints the ns, level etc
08:13	tdammers	timbre*
08:15	pandeiro	seems my problem above is with pantomime.mime/mime-type-of, not liberator per se... huh
08:17	jtmarmon	how do you structure a system of components so that the components know that they're in testing/dev/prod mode? in testing, for example, I'd want my "twilio" component to use twilio's magic numbers instead of trying to register real twilio numbers, but that isn't something that can just be tuned by the component inputs (since the inputs to the twilio component are just account credentials - number purchasing is automated)
08:17	pandeiro	jtmarmon: environment variables?
08:18	snowell	jtmarmon: https://github.com/weavejester/environ
08:19	jtmarmon	hmmm..it seems to me that using env vars would sort of void the purpose of letting component manage dependency injection. now you have two sources of truth for configuration to worry about
08:20	jtmarmon	rather than just a test config map, prod config map, etc
08:20	pandeiro	jtmarmon: i haven't used component a lot but couldn't the twilio component depend on the config component or something?
08:21	pandeiro	and then the config component sources its data acc. to env
08:22	jtmarmon	pandeiro: right that's my intention - having the config indicate to components what state they should take. it just seems messy to pass in an indicator like (->Twilio "accountsid" "authtoken" :test) to every component that has special state during test mode.. i guess there's not really a better way to do that
08:22	jtmarmon	can you have variadic argument record constructors?
08:23	oddcully	map->Twilio perhaps?
08:25	jtmarmon	oddcully: i'm not quite clear on what the map->* syntax actually does. can you clarify for me?
08:27	pandeiro	jtmarmon: turns a map into a record i believe
08:27	oddcully	it constructs you a record from a map (with keywords like your attributes in the record)
08:28	jtmarmon	got it, ty.
08:33	pandeiro	anyone experienced w/ pantomime/tika know why org.apache.tika.Tika.detect() would be throwing a org/apache/commons/compress/archivers/StreamingNotSupportedException on a [B input?
08:34	TEttinger	[B being bytes?
08:34	TEttinger	,bytes
08:34	pandeiro	TEttinger: yeah, right?
08:34	clojurebot	#object[clojure.core$bytes 0x59424635 "clojure.core$bytes@59424635"]
08:34	pandeiro	is that not the same as a byte array? :)
08:35	TEttinger	[B is the actual type of a primitive byte array, yeah
08:35	TEttinger	but you can also call it, conveniently, bytes, in type hints
08:35	TEttinger	,(type (bytes [1 2 3]))
08:35	clojurebot	#error {\n :cause "clojure.lang.PersistentVector cannot be cast to [B"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.PersistentVector cannot be cast to [B"\n :at [clojure.lang.Numbers bytes "Numbers.java" 1371]}]\n :trace\n [[clojure.lang.Numbers bytes "Numbers.java" 1371]\n [sandbox$eval47 invoke "NO_SOURCE_FILE" 0]\n [clojure.lang.Compiler eval "Compiler.java" 6792...
08:35	TEttinger	hm
08:36	pandeiro	right I see that in pantomime's protocol implementation signatures
08:36	TEttinger	I think bytes is just the cast
08:36	TEttinger	so what class throws this?
08:36	TEttinger	it's possible you need to wrap the byte[] somehow so it can stream it
08:36	pandeiro	java.lang.NoClassDefFoundError: org/apache/commons/compress/archivers/StreamingNotSupportedException
08:37	TEttinger	what code throws the error
08:37	pandeiro	TEttinger: https://github.com/michaelklishin/pantomime/blob/master/src/clojure/pantomime/mime.clj#L50-L53
08:38	pandeiro	...as far as I can tell...
08:40	TEttinger	https://github.com/apache/tika/blob/trunk/tika-core/src/main/java/org/apache/tika/detect/Detector.java#L57
08:41	TEttinger	detect takes an InputStream, and I don't think a byte array can be cast to that
08:41	kwladyka	I am looking in Clojure web framework something similar what Laraver has, for example: return redirect()->back()->withInput()->withErrors($errors); - it redirect to site from request was sended with field inputs and with error msg.
08:41	kwladyka	It is very usefull with POST forms
08:42	TEttinger	huh, never seen (extend byte-array-type
08:42	pandeiro	TEttinger: thanks... odd thing is it works fine in the tests where i generate base64 on the jvm side (then convert to [B, stick in postgres, retrieve at bytes and then extract mime type)...
08:42	pandeiro	s/at/as
08:42	TEttinger	pandeiro, right, there aren't bytes on JS
08:43	pandeiro	yeah so the http handler expects base64 and then does the decoding
08:43	pandeiro	thought maybe the browser's base64 encoding is funky but the file seems identical
08:44	pandeiro	weird thing too is even wrapping pantomime.mime/mime-type-of in a (try ...), the exception 'escapes'
08:45	pandeiro	didn't know that was even possible?
08:49	TimMc	That sounds like something deeper is wrong, like you're looking at the wrong source.
08:49	pandeiro	TimMc: hmm... yeah...
08:50	TimMc	because that sounds impossible
08:50	pandeiro	TimMc: ok good to know, gotta dig through it... but it is the only place in the entire source tree where that namespace and function are used
08:51	pandeiro	and when I comment it out, no exception
08:53	pandeiro	(catch Exception e ...) should catch anything right?
08:57	dnolen	ClojureScript can now compile ClojureScript, only trivial things working but still fun https://github.com/swannodette/cljs-bootstrap
08:57	TimMc	pandeiro: Oh, is this Clojure or CLJS?
08:57	pandeiro	TimMc: clojure
08:57	TimMc	Try Throwable? What is being thrown?
08:57	pandeiro	java.lang.NoClassDefFoundError: org/apache/commons/compress/archivers/StreamingNotSupportedException
08:58	pandeiro	could this be a crazy commons compatibility thing/
08:58	TimMc	Oh yeah, Error is a sister class to Exception, so that's why you couldn't catch it.
08:59	pandeiro	TimMc: ah, so if I want to catch everything, I use Throwable?
08:59	TimMc	Yeah, but it can be a bad idea. :-P
08:59	pandeiro	why?
08:59	clojurebot	why is the ram gone is <reply>I blame UTF-16. http://www.tumblr.com/tagged/but-why-is-the-ram-gone
09:01	TimMc	Some Throwables are things like ThreadDeath, and you really want those to propagate. It's fine for logging purposes (but then you should rethrow), or if a thread absolutely, positively must not die.
09:01	TimMc	I don't remember the details, and it's a bit folkloreish, unfortunately.
09:02	pandeiro	huh, even with (catch Throwable ...) the error/exception propagates
09:02	TimMc	That's alarming.
09:02	pandeiro	I'm alarmed.
09:02	TimMc	It must not be thrown in that scope, then.
09:03	TimMc	Do you have a stack trace that actually implicates that fn, or could it be a compile-time error?
09:03	pandeiro	sure one sec
09:04	pandeiro	http://sprunge.us/dBFF
09:05	TimMc	Well, that's pretty clear, I guess.
09:06	TimMc	I've never heard of (catch Throwable) not catching everything, though, so we're missing something.
09:06	pandeiro	what would the realm of possibilities include?
09:07	pandeiro	i'd really like to leave the mime detection stuff in place and be able to (try ...) in order to just revert to another heuristic or something if/when tika explodes like this...
09:08	TimMc	Well, the class not found could be a dep mismatch; see if `lein deps :tree` turns up any Commons version mismatches.
09:08	pandeiro	dunno if it matters but the code in question is here: http://sprunge.us/bDaL
09:11	TimMc	What is mime-type-of? Is it a macro? I don't see it in the stack trace, and I don't see the definition.
09:11	pandeiro	huh, don't see a direct conflict: http://sprunge.us/PIFG
09:11	pandeiro	pantomime.mime/mime-type-of, sorry
09:11	pandeiro	i :refer it
09:12	TimMc	So, is it a macro?
09:12	pandeiro	no it's a protocol... 'method'?
09:12	pandeiro	being given a byte-array
09:13	pandeiro	so should be this: https://github.com/michaelklishin/pantomime/blob/master/src/clojure/pantomime/mime.clj#L50-L53
09:14	TimMc	I see, that's why it's an anonymous fn in the stack trace.
09:14	pandeiro	yeah that's something i don't like about record/protocol-y stuff :/
09:15	pandeiro	ha
09:15	pandeiro	removing selenium from my deps at least gets me my (try ...) back :)
09:16	TimMc	You're able to catch now?
09:16	pandeiro	yep
09:16	TimMc	yikes
09:16	pandeiro	:)
09:17	pandeiro	tell me about it
09:17	TimMc	what the hell
09:17	pandeiro	it's odd that lein deps :tree didn't complain about any commons-* conflicts
09:18	pandeiro	but that stuff is in 20 different packages it seems so maybe that's why... maybe the dep graph is crazy between those things
09:18	pandeiro	TimMc: super grateful for the help, TEttinger: you too
09:19	TEttinger	I'm glad I could help, even if most of the time I was helping my kitten catch a june bug
09:20	TimMc	TEttinger: That's important.
09:20	pandeiro	yeah a bug's a bug
09:20	TEttinger	(inc kittens)
09:20	pandeiro	i need a cigarette
09:20	TimMc	(dec kittens)
09:20	TimMc	just kidding
09:20	TimMc	(inc kittens)
09:21	TimMc	amalloy_: botdead
09:21	TEttinger	http://i.imgur.com/3ma6cRl.gifv
09:21	TimMc	amalloy_: It's important, I need to give karma to kittens.
09:35	TimMc	TEttinger: Adorable.
09:36	TEttinger	it's octocat!
10:23	irctc	I'm trying to come up with a way of parallelizing my reduce of a huge seq of maps. Order is not important. The vanilla reduce function is to assoc several calculations onto the map. This is pure CPU bound processing (calculating geometric average with BigDecimal). All the fold examples I'm seen are virtually identical, counting items in a map.
10:24	irctc	Anybody have experience with reducers r/fold r/monoid and combining maps back into a vector?
10:25	benhuda	hello
10:26	irctc	benhuda: ciao!
10:38	phillord	Is there a function in clojure that has the "nil-safe" capabilities of some-> but doesn't do the threading
10:39	phillord	so transforms (a (b (c 1))) into something that returns "nil" if any of the c, b or a calls return nil?
10:40	pwzoii	maybe monad?
10:40	pwzoii	phillord: would that design work?
10:41	phillord	pwzoli: in what sense? I mean, some-> has two functionalities -- should be possible to do them both?
10:41	phillord	or rather do them independently
10:42	profil	phillord: and?
10:43	phillord	I was wondering if there were a way -- I not a great fan of threading, but I need the nil short-circuiting
10:43	stuartsierra	phillord: There's nothing built-in that does this. It would have to be a code-restructuring macro like `some->`
10:44	stuartsierra	phillord: `fnil` can make a single function "nil-safe" with a default value.
10:44	profil	phillord: (and (fn1) (fn2) (fn3))
10:45	phillord	no I need it to short-circuit -- the late stuff fails
10:45	profil	and does short-circuit
10:45	phillord	profil: nope, I need to pass values between fn1,fn2 and fn3
10:45	profil	without threading? why?
10:45	phillord	never mind, was just curious -- will use threading instead
10:46	phillord	profile: I may be in a minority, but personally, I find the threading a little confusing
10:46	profil	(-> 1 (c) (b) (a)) is equal to (a (b (c 1)))
10:47	profil	which means that the threading is done the "right" way
10:47	pyrtsa	phillord: I once did this silly little write-up where you can short-circuit by binding (reduced expr) to some "ret" binding: https://gist.github.com/pyrtsa/1af9fdd56267a3631b0c#file-ret-clj-L3-L22
10:48	pyrtsa	Becomes nicer if you use functions (or wrappers) that return (reduced x) in case of error.
10:49	phillord	pyrtsa: looks good -- something like a let binding would make sense!
10:49	phillord	thanks for suggestions!
10:50	pyrtsa	Yep, the transformation from (let [x expr1, y expr2] body) into (ret [x expr1, y expr2] body) is pretty straightforward, I'd say. :)
10:50	pyrtsa	Then just make the exprs short-circuit when needed.
11:19	irctc	,(require '[clojure.core.reducers :as r])
11:19	clojurebot	#error {\n :cause "Could not locate clojure/core/reducers__init.class or clojure/core/reducers.clj on classpath."\n :via\n [{:type java.io.FileNotFoundException\n :message "Could not locate clojure/core/reducers__init.class or clojure/core/reducers.clj on classpath."\n :at [clojure.lang.RT load "RT.java" 449]}]\n :trace\n [[clojure.lang.RT load "RT.java" 449]\n [clojure.lang.RT load "RT.java"...
11:19	irctc	,(r/fold (r/monoid conj list) (r/map #(assoc % :b (inc (:a %))) [{:a 1} {:a 9}]))
11:19	clojurebot	#error {\n :cause "No such namespace: r"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: No such namespace: r, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "No such namespace: r"\n :at [clojure.lang.Util runtimeException "Util.java" 221]}]\n :trace...
11:33	justin_smith	irctc: I think it's because reducers use threads
11:35	irctc	justin_smith: Yeah, threads, security, etc. No worries. Once I looked at the impl of r/monoid, I saw the pattern. Just thought I'd post back the essence.
11:56	voidnoid	dunno if this is OT, can anyone recommend some good books that are more theory based?
11:57	voidnoid	I'm aware of SICP for example, but looking for some other suggestions too if anyone has them
11:59	justin_smith	voidnoid: joy of clojure has some good theory elements to it
12:00	voidnoid	justin_smith: cool thanks
12:01	hiredman	~bookshelf
12:01	clojurebot	bookshelf is http://www.amazon.com/Clojure-Bookshelf/lm/R3LG3ZBZS4GCTH
12:02	kwladyka	hello justin_smith :)
12:03	mmeix	So palletop/leaven serves the same purpose as Component, right? Why would I chose one over the other?
12:03	justin_smith	kwladyka: hello
12:05	mmeix	* palletops/leaven
12:06	justin_smith	mmeix: I don't know leaven at all, but I do know that component has wider general adoption (and for me it works great)
12:08	mmeix	ok, thanks
12:14	justin_smith	oh - leaven looks good, and it's cljs compatible which is cool
12:17	justin_smith	but I like the way component has declarative deps vs. explicit dep order
12:17	justin_smith	I guess that's a style thing? that's the boot / leiningen difference too
12:17	justin_smith	the/a ?
12:37	devn	hello all
12:37	devn	logback + clojure.tools.logging -- is that a thing?
12:41	mnngfltg	devn, I'm pretty sure you can use it, yes
12:42	mnngfltg	doesn't logback simply implement the log4j api?
12:42	TimMc	We use that in a projector two, yeah.
12:42	TimMc	*project or
12:42	devn	other question is -- timbre? decisions, decisions.
12:43	devn	i have a situation or two where i'll need to refer to specific classes for things like Layout
12:43	devn	it's not totally clear to me if timbre supports that, but i havent finished digging into it
12:45	devn	that's kind of how i feel about it
12:45	devn	but timbre does have a few things that i'd like to have, utility-wise
12:45	devn	but i suppose there's nothing that precludes me from just using those fns
12:46	justin_smith	log4j can have per-package config, right? like applying a different log level on a package basis?
12:46	justin_smith	I sometimes think it would be nice to be able to modulate logging per namespace
12:46	devn	justin_smith: yes you can do that
12:47	devn	specifically thinking of stuff like logged-future, log-and-rethrow-errors, uncaught-jvm-exceptions! -- those are nice to have
12:47	justin_smith	cool, so I assume the per-package stuff using the namespace package might just work?
12:47	devn	mnngfltg: so are you using logback with a logback.xml?
12:51	mnngfltg	devn, no I used regular log4j
12:52	devn	ah ok
13:05	m1dnight_	seems like there is a meeting of the .be clojure community at my uni
13:05	m1dnight_	they just invited me to come and listen :>>>
13:37	Guest53	Hi @all! I'm currently playing a bit with xmpp-clj, but in the repl it seems the bot is not keeping online?
13:37	Guest53	(xmpp/start-bot :username "username" :password "password" :host "host" :domain "domain" :handler (fn [m] "Hi, I'm 'Bot'!")))
13:37	Guest53	returns in REPL with {:default #<XMPPConnection org.jivesoftware.smack.XMPPConnection@12368a85>}
13:38	Guest53	how to send/receive messages?
13:49	jtmarmon	how does one write tests for an application using components? I need access to the datomic connection so I can add test data - is there a way I can directly get components from the system without being a component myself?
13:59	tmtwd	(ns my.library) is a namespace or a module?
14:04	amalloy	tmtwd: there's not really any such thing as a module
14:04	tmtwd	oh ok
14:05	amalloy	that form creates a namespace named my.library, and doesn't put anything in it
14:05	justin_smith	jtmarmon: you can instantiate an individual component and call call start on it individually
14:06	justin_smith	no need to build a system if you only need one component for a test
14:06	tmtwd	how do you get just a plain clj repl running in emacs or the terminal?
14:06	tmtwd	(or lein)
14:06	justin_smith	likely you would pass in placeholders (somewhat like mocks) for any other components it expects to use
14:06	justin_smith	tmtwd: plain cljs, or lein?
14:06	justin_smith	err, clj
14:07	tmtwd	either
14:07	justin_smith	tmtwd: the easiest is java -jar clojure.jar
14:07	amalloy	tmtwd: if you have lein already, the easiest is lein repl
14:07	tmtwd	ah ok
14:07	justin_smith	where you likely have clojure-foo.jar in your ~/.m2/ somewhere already
14:07	justin_smith	amalloy: yeah, you are right, I meant "simplest" not easiest
14:09	amalloy	justin_smith: an interesting proposal. yours is certainly simplest from clojure's POV, but i wonder if lein repl is simpler from the user's point of view since it doesn't entangle notions of what filesystem paths the relevant jars are on
14:12	oddcully	yet nothing what an alias cant fix for repetitive use
14:12	oddcully	and some nice rlwrap-ping
14:13	TimMc	and pretty soon you've built lein
14:40	justin_smith	amalloy: I perhaps misunderstood the thing required - "plain clj repl" to me implied just clojure with no project deps
14:40	justin_smith	amalloy: and reliably getting that from lein would likely require some weird hoops
14:41	justin_smith	(my brain is a bit scattered today)
14:41	amalloy	probably it would, indeed. the requirements were not spelled out to an exacting level of detail, and we filled in the blanks differently
15:07	pandeiro	why might tika bork on trying to detect bytes received via jetty/http, but not when simulating the requests/response with peridot?
15:09	pandeiro	it's [base64 -> bytes -> tika -> mime type string] both days
15:09	pandeiro	i've compared the base64, identical... how can i compare the bytes?
15:09	justin_smith	pandeiro: are you sure the http stream is base64? and not the bytes themselves?
15:10	justin_smith	identical base64 will always be identical bytes
15:10	pandeiro	justin_smith: yeah for sure, i'm sending it base64 intentionally
15:10	pandeiro	right and because it's ascii encoding couldn't be it, right?
15:10	pandeiro	(like jetty doing something weird)
15:10	justin_smith	yeah, valid base64 only uses the ascii subset
15:11	justin_smith	unless one side is using utf16?
15:11	justin_smith	something that is not ascii compatible
15:11	pandeiro	javascript uses utf16 internally but i don't think that's it
15:11	justin_smith	java also uses utf16 or something very close to it internally
15:11	pandeiro	i've compared the base64 i get from the browser and what my tests produce and it's identical
15:12	justin_smith	if you had a utf8/ascii string on one side, and utf16 on the other, and they were being processed the same, you could see some issue
15:12	justin_smith	OK
15:14	pandeiro	another weird possibility: a lein development profile task running and a test profile task could have different versions of common deps potentially, i wonder?
15:15	pandeiro	i keep thinking my issue must be related to conflicting versions of apache commons stuff, but i don't see it in lein deps :tree
15:15	pandeiro	and there is only one version of tika anywhere
15:16	justin_smith	compare the numeric output of (.getBytes s) for the base64 strings on each side
15:16	justin_smith	(into [] (.getBytes s)) might be more convenient to read
15:17	justin_smith	,(into [] (.getBytes "hello" "UTF-16"))
15:17	clojurebot	[-2 -1 0 104 0 ...]
15:17	justin_smith	,(into [] (.getBytes "hello" "UTF-9"))
15:17	clojurebot	#error {\n :cause "denied"\n :via\n [{:type java.lang.SecurityException\n :message "denied"\n :at [clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]}]\n :trace\n [[clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]\n [clojurebot.sandbox.proxy$java.lang.SecurityManager$Door$f500ea40 checkPropertyAccess nil -1]\n [java.lang.System getProperty ...
15:17	justin_smith	,(into [] (.getBytes "hello" "UTF-8"))
15:17	clojurebot	[104 101 108 108 111]
15:17	pandeiro	justin_smith: nice, let me try that
15:20	pandeiro	ouch printing byte arrays into emacs shell buffer
15:27	pandeiro	byte arrays are identical...
15:45	pbiggar	anyone know a nice way to retry clojure.test tests if they fail? we have some flaky tests that I'd love to just retry 4-5 times (until they pass at least once)
15:46	pbiggar	(so I'm looking to do something like wrap them in a middleware where if the test fails its retried and if it succeeds it isn't marked as a failure)
15:58	zerokarmaleft	pbiggar: imho, at that point I think you have to ask yourself if those tests are providing any value
15:59	pbiggar	zerokarmaleft: Already did :) They provide a lot of value. But they're unreliable. Deleting them sucks. Keeping them being unreliable sucks. Retrying them doesn't suck
16:00	zerokarmaleft	is there any way to adjust the seam along which you're testing so that you can rewrite the tests to be deterministic?
16:00	pbiggar	they test against an unreliable 3rdparty service
16:00	pbiggar	so no
16:00	pbiggar	mocking isn't an option for this test
16:01	TimMc	pbiggar: Write a lazy seq that runs the fn under test, filter it for the desired answer, and test that you get at least one valid.
16:01	TimMc	Also say 3 Hail Marys.
16:02	pbiggar	@TimMc: interesting. OK, will try that. Very smart, thanks!
16:02	TimMc	Maybe also donate to a charity.
16:03	pbiggar	TimMc: what about the (is) calls in the fn. Won't they update the global count?
16:05	TimMc	Only one (is) call. (is (not= (first (filter is-valid? (repeatedly 5 the-test))) nil)) or something.
16:06	pbiggar	i was thiking about putting the (is) calls in the test, so that it doesn't really change how we write tests
16:06	TimMc	Well, that won't get you what you want.
16:06	pbiggar	so something like (deftest my-test-name (with-retries 5 ....)
16:06	TimMc	I don't know enough about clojure.test in order to write that. My suggestion will "work" without any extra research.
16:07	pbiggar	maybe if I bind the assertion failure counts. starting to get messy
16:07	pbiggar	TimMc: yes, it will
16:07	TimMc	It should look ugly. :-)
16:08	pbiggar	That isa philosophy I don't subscribe to :)
16:08	pbiggar	looks like I can bind do-report
16:13	kaiyin	I hate to have to deal with html and css stuff, what libraries should I learn if want to develop a website using just clojure and clojurescript?
16:15	TimMc	pbiggar: If it's too easy to use, people will use it.
16:15	TimMc	Remember to test that any failures are the expected kind of failure, otherwise you'll miss real failures of other sorts.
16:16	TimMc	kaiyin: You'll still have to deal with HTML and CSS. :-)
16:16	kaiyin	ok, :-(
16:16	kaiyin	they are just ugly.
16:16	TimMc	I won't dispute that. :-)
16:18	TimMc	There's a safe version of Hiccup you can use: https://github.com/ato/clojars-web/blob/master/src/clojars/web/safe_hiccup.clj (Don't use unmodified Hiccup, you'll get cross-site scripting vulnerabilities in your website.)
16:18	eriktjacobsen	/join #leiningen
16:18	eriktjacobsen	whups
16:21	eriktjacobsen	Does anyone have any good guides on running down compile issues? We had some conflicting versions, so I started normal route of “lein deps :tree” and start adding exclusions. The problem is now I’ve hit a brick wall in that I am getting notice a specific package is breaking, but that package has no shown dependency issues and all the correct versions should be loading for it. The compile error and output from deps is
16:21	eriktjacobsen	here: https://gist.github.com/eriktjacobsen/9d02b57225db92dbe496
16:22	eriktjacobsen	Adding the exclusions got me through a douplicate signer error and two other missing class issues, but those seem to have resolved via exclusions unrelated to the cheshire package
16:27	arohner	eriktjacobsen: are you AOT'ing?
16:27	arohner	eriktjacobsen: or depending on any packages that have been AOT'd?
16:27	eriktjacobsen	:aot :all
16:28	arohner	AOT also transitively compiles all dependencies
16:28	arohner	and .class files are loaded with higher priority than source .clj files
16:29	arohner	so for your deps to be respected, make sure your tree is clean, and make sure a dep isn't AOT'ing a lib version that you want to specify
16:30	pandeiro	arohner: if a dep were AOT'ing a lib, that version would be reflected by `lein classpath` right?
16:30	pandeiro	(i'm also in dep hell right now [i think])
16:31	arohner	pandeiro: I don't think so
16:31	eriktjacobsen	well, I do run lein clean before each compile, so no classes in target/. I’m guessing next step is to remove :aot during conflict resolution. How would I tell if a dep was AOT’ing a lib version I wanted to specify
16:31	pandeiro	huh
16:31	arohner	pandeiro: lein dep tells you the lein/mvn .pom asks for, not what .class files are on disk
16:31	arohner	eriktjacobsen: inspect the jar for .class files :-/
16:31	pandeiro	arohner: ie, in `target/`?
16:31	pandeiro	or in .m2 as well?
16:31	arohner	pandeiro: could also have .class files in a jar
16:32	arohner	and that's the tricky one
16:32	pandeiro	so how does one get the definitive list of which versions of what are being loaded by a lein process?
16:33	justin_smith	pandeiro: lein cp will generate the actual classpath used, and I have been able to plug that into an explicit java call
16:33	TimMc	Worst case you could launch a repl and ask for the .class and .clj resources.
16:34	pandeiro	there's no existing tool to diff classpaths from clojure right?
16:34	TimMc	or iterate through the classpath, call unzip -l on each one, and grep for the class.
16:34	TimMc	pandeiro: It's not even the classpath that matters here, all you'll get is jars and target/ and such.
16:35	pandeiro	ah ok
16:35	TimMc	Where to look, not what's there.
16:35	arohner	pandeiro: what I'm trying to get at is there's only a loose connection between a version, and what actually gets loaded. If you have a "malicious library maintainer", they could AOT their lib against [foo "1.0"], set the project.clj to [foo "2.0"], and then zip up
16:36	arohner	pandeiro: your program downloads the lib, and [foo "2.0"], but because AOT, the foo 1 classfiles get loaded
16:36	arohner	now, that's an extreme case, and unlikely
16:36	arohner	but I've seen similar things in the wild
16:36	pandeiro	yeah, i wish mine were that exciting but i'm sure it's more banal than that
16:37	pandeiro	i get a ClassNotDefError when i run code with profile dev, but not with test
16:37	pandeiro	same code
16:37	pandeiro	looking at lein classpath from both profiles shows the same version of the package with the class in question
16:38	amalloy	pandeiro: i don't think there's any such thing as a ClassNotDefError. if you are going to tell people error messages, they should probably be the actual error messages, copy/pasted
16:38	pandeiro	amalloy: sure good point
16:38	pandeiro	NoClassDefFoundError
16:39	TimMc	,(defn foo [] )
16:39	clojurebot	#'sandbox/foo
16:40	TimMc	,(.getResource (class foo) "clojure/core__init.class")
16:40	clojurebot	nil
16:40	TimMc	,(.getResource (class foo) "clojure/core.clj")
16:40	clojurebot	nil
16:40	TimMc	Interesting. But run those locally, you'll see the clj and class files be found.
16:41	TimMc	(I'm using fn's class because it's a cheap and dirty way to get the right classloader.)
16:48	TimMc	As a bonus, it will tell you where it found them. :-)
16:48	pandeiro	TimMc: yeah i tried it at the repl, that's cool
16:49	pandeiro	unfortunately i don't see how to really apply that to my problem
16:49	pandeiro	i have to figure out the filepath of where the the not Def'd class ought to be, i guess?
16:50	pandeiro	i tried (println (.getResource org.apache.commons.compress.archivers.StreamingNotSupportedException "org/apache/commons/compress/archivers.class")), which is wrong apparently
16:53	pandeiro	tried the file 'org/apache/commons/compress/archivers/StreamingNotSupportedException.java' (where it exists in the commons-compress src) too, grasping at straws here...
17:00	matthavener	is (seq X) idiomatic for (not (empty? X)) ?
17:00	pandeiro	matthavener: there's (not-empty x) too
17:01	matthavener	ah cool, thank you
17:02	amalloy	ugh do not use not-empty for that
17:02	amalloy	that is what seq is for
17:03	AimHere	What's not-empty for then?
17:04	matthavener	from amalloy: http://stackoverflow.com/questions/3118962/what-is-the-correct-clojure-way-to-check-if-a-collection-is-non-empty#comment7947976_3120045
17:04	amalloy	it is for when you need to test for emptiness but not convert it into a seq if it's non-empty
17:04	amalloy	eg (when-let [xs (not-empty (build-some-map)] (...use xs as a map))
17:07	TimMc	pandeiro: Oh, I got two conversations confused. That was actually for eriktjacobsen, I think.
17:07	eriktjacobsen	TimMc: “Worst case you could launch a repl and ask for the .class and .clj resources.” How would I go about doing that? If I remove :aot then I can start the repl, and even (require ‘cheshire.core) and see the same error message
17:08	eriktjacobsen	Also sanity check: in cheshire it complains about tag not being public…. in generate.clj there is a (defmacro tag), and in generate_seq.clj there is (:use [cheshire.generate :only [tag]]) in the namespace…. and the latter is whats failing
17:09	csd_	When I try to cider-jack-in, it tells me I'm connected to the nrepl but doens't actually open a window with the repl. When I look at the buffers, I see it creates 2 nrepl buffers, one for "server" and the other for "connection". As I recall from using cider before, there should only be one nrepl window and another window labeled cider .... What might be causing this?
17:09	eriktjacobsen	afaik defmacro should be public for the :use… so just in case there is some unrelated to compiling issue this might be source problem
17:09	TimMc	eriktjacobsen: The method I described would only help you probe for AOT'd versions of a specific namespace, unfortunately.
17:09	TimMc	I don't know if an easy way to search for such things.
17:10	eriktjacobsen	TimMc: so if I take out AOT and merely try to require the offending library from the repl and get same error message… any idea how I’d start running down the issue? It doesnt seem to be a problem with this often used library so I’m 99% sure its my local environment
17:12	pandeiro	csd_: the nrepl-server buffer may have useful info
17:12	csd_	pandeiro: alas, it does not :-/
17:12	pandeiro	sometimes it's just downloading 200 dependencies and taking a while
17:13	pandeiro	nothing at all?
17:13	csd_	it just says im connected, have a nice day
17:14	eriktjacobsen	TimMc: also I’m a bit of a loss as to what you were using the second argument of getResource… I can (require ‘cheshire.generate) without error but can’t call “ (.getResource (class cheshire.generate))”
17:16	jcrossley3	csd_: pandeiro: i'm seeing the same
17:17	csd_	jcrossley3: think its a bug?
17:17	pandeiro	brand new cider?
17:17	csd_	yeah
17:17	jcrossley3	yep, 0.9.0
17:19	pandeiro	working for me with cider-20150615.1053
17:19	pandeiro	(0.9.0-SNAPSHOT)
17:19	csd_	pandeiro: would i need to use git to dl that?
17:20	pandeiro	csd_: no just emacs
17:20	pandeiro	with the melpa repo enabled
17:20	pandeiro	that will get the latest snapshots
17:20	csd_	ah looks like i installed from melpa-stable
17:21	TimMc	eriktjacobsen: You need to get ahold of a Class that has the right classloader. The Class of a function defined in your program works for that.
17:22	freeone3000	I'm trying to get my first clojure application working, an anagram finder. My application so far looks like: https://gist.github.com/freeone3000/19d6224a8d2dd7142274 . my errors are included in the paste. Where am I attempting a cast?
17:23	TimMc	If you take out AOT from your own llib, you still have to contend with the possibility of an AOT'd library conflicting with a dependency. Let's say you depend on Bar and Baz, and both depend on Foo.
17:23	TimMc	If Baz is AOT'd then you'll have the Foo dependency on your classpath, but also Baz's compiled version of it.
17:23	eriktjacobsen	TimMc pretend I know nothing about java/ jvm (I’ve been progrmaming in clojure for years but rarely have to worry about the java backend). where would I find the class of a defined function?
17:24	eriktjacobsen	Gotcha about AOT’d dependencies
17:24	TimMc	Just like I demonstrated -- (defn foo [] ) and use (class foo) as your Class. The explanation is kind of complicated, I can't provide it at the moment.
17:24	eriktjacobsen	Ok. So class = function name?
17:24	TimMc	No, each Clojure function is backed by a Class.
17:24	TimMc	,(class +)
17:24	clojurebot	clojure.core$_PLUS_
17:25	amalloy	freeone3000: you want (defn frequency-table [words])
17:25	TimMc	,(Class/forName "clojure.core$_PLUS_")
17:25	clojurebot	clojure.core$_PLUS_
17:25	csd_	pandeiro: its giving me an error saying my nrepl version is 0.2.6 when im using the 0.9.0 release. any idea what that's about?
17:25	jcrossley3	csd_: this may help: https://github.com/clojure-emacs/cider/issues/1050
17:26	freeone3000	amalloy: Ah, I accidentally a reserved word. Thanks.
17:26	amalloy	well actually you aren't even using that words argument
17:26	amalloy	no, i don't think you did
17:26	freeone3000	amalloy: So why "words" and not "word"?
17:26	amalloy	freeone3000: i guess i am confused. it doesn't seem like your source file, as written, should cause that error
17:26	eriktjacobsen	TimMc: I’m trying to require cheshire.generate-seq but it is failing, so I can’t use anything in there as a function… likewise my own project’s core.clj includes the cheshire so it also will fail in a (require).. what function should I be putting into class? Just a random function I create in the repl itself?
17:27	freeone3000	amalloy: But "words" instead of "word" fixes it.
17:27	amalloy	uh
17:27	amalloy	freeone3000: the important change was removing the &, not the name change
17:27	amalloy	but i think if you change it back it should still work
17:27	clojurebot	It's greek to me.
17:27	amalloy	because you aren't even using the argument, and the name you give it doesn't matter at all
17:28	freeone3000	amalloy: Ah. Okay.
17:28	eriktjacobsen	TimMc: I’ve tried that, and upon entering (.getResource (class foo)) I get “No matching field found: getResource for class java.lang.Class"
17:28	TimMc	eriktjacobsen: You ned to ask it for a resource. (It needs another argument.)
17:30	freeone3000	amalloy: Okay, it looks like there's some change between when I make a code change and when running the program gets different results. is there a clojure agent or something similar to the scala agent that could cause problems like this?
17:30	eriktjacobsen	Gotcha, thanks. per my previous msg: “also I’m a bit of a loss as to what you were using the second argument of getResource”. So what is the other argument “cheshire.generate-seq” as this is the failing to compile file?
17:31	justin_smith	(inc eastwood)
17:31	lazybot	⇒ 9
17:31	justin_smith	finds my bugs :)
17:31	amalloy	freeone3000: no. possible causes might include AOT, but it doesn't look like you're doing any; or your IDE is doing some funny business; or you are expecting changes to be applied before you press Save or something
17:31	TimMc	eriktjacobsen: You're asking the JVM to find the actuall .class and .clj files in the jars.
17:32	TimMc	It's a quick way of searching the jars, subject to the limitation of your classloader.
17:33	eriktjacobsen	Alright, I believe I understand what you’ve said, however I’m not sure how that relates to the second argument. Is that the “actual clj files” in the jars? I’ve been throwing random strings at it, and I do get back something for “cheshire/core.clj” and the other files.
17:33	eriktjacobsen	Ok so I’m getting back: user=> (.getResource (class foo) "cheshire/core.clj") #<URL jar:file:/Users/eriktjacobsen/.m2/repository/cheshire/cheshire/5.5.0/cheshire-5.5.0.jar!/cheshire/core.clj>
17:34	devn	how do i prevent clojure.tools.logging from using commons-logging, and instead have it use log4j?
17:34	eriktjacobsen	All 3 source files in question (core, generate, generate_seq) all show up as coming from cheshire version 5.5.0, however it still won’t include with (require) as it is giving this “Tag not public” error.
17:37	TimMc	eriktjacobsen: What if you look for cheshire/core__init.class ?
17:37	tcrawley	devn: I think (alter-var-root #'clojure.tools.logging/logger-factory (constantly (clojure.tools.logging.impl/log4j-factory))) should do the trick
17:38	eriktjacobsen	ah
17:38	timvisher	what's this error mean? `No namespace: foo, compiling bar` ?
17:38	eriktjacobsen	TimMc: AHA file:/Users/eriktjacobsen/.m2/repository/collectiveds/scraper/0.9.2/scraper-0.9.2.jar!/cheshire/core__init.class>
17:38	TimMc	There you go! The culprit.
17:38	eriktjacobsen	TimMc: How did you know to look at core__init.class, and where can I find a book or guide that would give me that same information in the future
17:39	TimMc	I happened to know that that's the format of classname that namespaces get compiled to. :-/
17:39	TimMc	I think I knew that because of poking around in AOT'd JAR files or something.
17:40	eriktjacobsen	So why was looking at “cheshire/core.clj” giving me different than “cheshire/core__init.class”… because .class is higher precedence to .clj files? So I should always be inspecting with the “__init.class” appended to whatever I want to really look for?
17:40	TimMc	Maybe there's a book or guide that would tell you that but... unfortunately, I doubt there is.
17:41	TimMc	Yeah, the classfile would be the first place to look. It's higher precedence in Clojure 1.6.0 and below. I think 1.7.0 switches it.
17:41	puredanger	no, it does not
17:42	TimMc	Huh. WHat does it change, then? There's something about this...
17:42	puredanger	the primary change in 1.7 is that class loads will now inspect the dynamic class cache before going to disk
17:42	puredanger	but .class will still be picked over .clj if both are on the classpath
17:43	puredanger	I have not read the back chat
17:43	puredanger	so apologies if I'm missing all the relevant context :)
17:43	TimMc	Oooh, OK. I think I heard differently in the channel at some point.
17:44	TimMc	puredanger: Context is dependencies and transitive AOT conflicts.
17:44	puredanger	well, there's a lot of subtleties :)
17:46	puredanger	is this while compiling your own project perhaps?
17:46	puredanger	uberjar for example?
17:48	puredanger	I have to step away, but happy to discuss tomorrow if neede
17:48	TimMc	puredanger: Not my project, no.
17:49	TimMc	Found the issue in eriktjacobsen's project, and am somewhat curious as to what I had misunderstood about .class vs. .clj precedence.
17:53	jcrossley3	csd_: you get it working?
17:54	jcrossley3	csd_: reinstalling clojure-mode got things working for me
17:57	eriktjacobsen	TimMc: better question…. is AOT the specific reason this doesn’t show up with “lein deps :tree” ?
18:05	TimMc	eriktjacobsen: Yep.
18:06	justin_smith	~clean
18:06	clojurebot	excusez-moi
18:17	pandeiro	anyone able to draw any leads from this: http://sprunge.us/SMhO
18:24	justin_smith	pandeiro: looks like you need to download the whole file before tika can tell you what it is?
18:24	pandeiro	justin_smith: yeah no it's downloaded, i'm testing with local files
18:24	justin_smith	http://commons.apache.org/proper/commons-compress/javadocs/api-1.8/org/apache/commons/compress/archivers/StreamingNotSupportedException.html
18:24	justin_smith	weird!
18:25	justin_smith	so ArchiveStreamFactory is being used erroneously?
18:25	pandeiro	justin_smith: no idea! none of this is thrown when i do the exact same thing in tests
18:26	pandeiro	i'm getting close to `rm -rf ~/.m2`
18:29	justin_smith	pandeiro: in my experience that doesn't really help much
18:29	pandeiro	it's not even clear to me which class is not being found
18:29	pandeiro	or which class definition
18:30	pandeiro	i am 80% it's related somehow to the classpath, not any actual app or library code
18:38	voidnoid	is there a good basics book available online? the primary docs http://clojure.org/reader seem to be geared more as a reference manual than an instructional book
18:38	voidnoid	rather, I'm guessing there is, wondering what people might suggest
18:42	pandeiro	voidnoid: http://www.braveclojure.com/ is pretty good imo
18:43	voidnoid	pandeiro: k thanks
18:47	arohner	does ring-mock (or any other ring testing library) support passing cookies around, similar to clj-http cookie manager?
18:48	pandeiro	arohner: peridot manages cookies
18:49	arohner	pandeiro: great!
19:09	arohner	pandeiro: peridot appears to be sending the header "Set-Cookie" rather than "Cookie". Am I doing something wrong?
19:11	pandeiro	arohner: ah, you're setting the cookie for the request manually?
19:11	arohner	pandeiro: no
19:11	arohner	pandeiro: trying to login to an app that uses friend for auth
19:11	pandeiro	Set-Cookie: is the name of the header that the response includes
19:12	arohner	pandeiro: right, but then the next request is sending Set-Cookie rather than Cookie
19:12	pandeiro	so with peridot i do something like (-> (session my-app) (do-login sample-user) (api-request :foo))
19:12	pandeiro	where api-request is just a wrapper over my api
19:13	pandeiro	and would include a cookie for my session if login succeeded
19:13	arohner	yup
19:15	arohner	hrm, actually it looks like it's losing cookies during a follow-redirect
19:23	arohner	pandeiro: aha! peridot doesn't like it if you mess with the Host header, because it uses that to decide which cookies to send
19:36	jacob_	hey guys i’m having problems connecting to datomic inside a docker container when datomic is hosted on aws. I have no problem connecting to a database that is in my local network though. any ideas?
19:37	eriktjacobsen	security groups? have you verified the port is open to that machine?
19:37	jacob_	i can expose only 1 port
19:37	jacob_	i have tried many different ones, like 4334
19:38	jacob_	which i think is the one that database is on
19:38	eriktjacobsen	get on the box running datomic and do “sudo netstat -nutlp” and see
19:38	eriktjacobsen	it’ll tell you what ports are listening
19:38	eriktjacobsen	Also: Yet another compilation question: My project has 2 libraries, lets say foo and bar, which each use the same underlying library, Bob, at different versions, 1 and 2. Foo requires 3 different sections of Bob version 1: A,B and C. (this shows in lein deps :tree as “com.Bob/A” vs “com.Bob/B”. Bar only requires A and B from version 2. If I put all 3 exclusions on bar, or all 3 on foo, or just the 2 overlapping on foo,
19:38	eriktjacobsen	I get different “ClassNotFoundException”.
19:39	eriktjacobsen	I’m bit of a loss as what to do. Never been a java / jvm guy. Coding clojure for 3 years and still rarely run into issues that aren’t solved with a quick exclusion
19:43	pandeiro	arohner: nice catch! good to know for future reference too
21:58	iamjarvo	are there any open source clojure webapps that show testing?
22:23	justin_smith	iamjarvo: I think circleci does
22:25	iamjarvo	i think it's just their frontend
22:25	danielcompton	amalloy: you around?
22:26	amalloy	could be
22:26	justin_smith	iamjarvo: oh, so you aren't interested in cljs test
22:27	danielcompton	amalloy: would it be possible to consolidate all of the flatland and ninjudd protocol buffer repos? It's really confusing having forks that both seem to be updated and maintained
22:27	iamjarvo	both, but more on the clojure side of things
22:33	wildnux	what is the idiomatic way of matching strings in a sequence and creating a map out of it ? for eg: ["//this is a comment line" "01-this is data line" "//TODO: todo line"]
22:34	wildnux	to {:comment "//this is a comment line" :data "01-this is data line" :special "//TODO: todo line"}
22:34	justin_smith	wildnux: perhaps (group-by line-categorizer lines)
22:35	justin_smith	where line-categorizer takes a line of text and returns :comment or :data or :special
22:35	justin_smith	,(group-by first ["hello" "world" "hippo" "welsch" "hottentot" "alabama"])
22:35	clojurebot	{\h ["hello" "hippo" "hottentot"], \w ["world" "welsch"], \a ["alabama"]}
22:36	wildnux	justin_smith: thank you, let me try
22:36	wildnux	justin_smith: coming from java background, i can think of line-categorizer as something in the line of: (if (.startsWith "//) ... )
22:36	amalloy	danielcompton: i dunno. the idea was that we wanted them to be flatland repos, but those didn't show up in our personal github profiles so it looked like we never did anything interesting
22:37	justin_smith	wildnux: sure, though it needs to be a function of course
22:37	wildnux	justin_smith: is there functional way of avoiding if then else ?
22:37	amalloy	so we re-hosted the repos, and then forked them back to flatland so old links would still work and so on
22:37	justin_smith	wildnux: cond can be nicer than nested ifs at least
22:37	justin_smith	(doc cond)
22:37	clojurebot	"([& clauses]); Takes a set of test/expr pairs. It evaluates each test one at a time. If a test returns logical true, cond evaluates and returns the value of the corresponding expr and doesn't evaluate any of the other tests or exprs. (cond) returns nil."
22:38	wildnux	justin_smith: aah yes, thank you.. let me try it
22:38	danielcompton	amalloy: I'm pretty sure that's no longer the case, they'll show up under "Repositories contributed to"
22:40	justin_smith	,(group-by #(cond (.startsWith % "//TODO: ") :special (.startsWith % "//") :comment :true :data) ["//this is a comment line" "01-this is a data line" "//TODO: todo line"])
22:40	clojurebot	{:comment ["//this is a comment line"], :data ["01-this is a data line"], :special ["//TODO: todo line"]}
22:40	justin_smith	of course the real art will be in making the categorizer better (eventually you might want a parser or at least regex?)
22:45	danielcompton	amalloy: the current situation is really confusing. If you still wanted it to show up as your repo on GitHub, could you remove the flatland forks, but keep the groupID as flatland?
23:12	wildnux	justin_smith: yeah, for now this should work :)
23:26	lvh	When I open up a nrepl session, say, in CIDER, it automatically honors stuff from project.clj, like :init-ns, :init and other :repl-options. What's the part that actually makes that work for CIDER? How does it ask leiningen what it shoudl to do the REPL before giving it to the user? I'm asking because I'd like to contribute that behavior to figwheel.
23:27	amalloy	lvh: leiningen does all that, not cider
23:27	amalloy	cider just says "hey lein, gimme a repl"
23:29	justin_smith	and lein's all like "OK, current wait time for a repl is about 45 seconds" and then puts cider on hold
23:30	lvh	Oh, okay.
23:31	lvh	amalloy: So, right now, figwheel sets up an nrepl server, but it ignores all the nrepl middleware and other :repl-opts stuff from project.clj, since, well, it's not lein
23:31	lvh	I'm not sure what the best way to fix that is
23:31	lvh	just using stuff from project.clj seems fine, since it's already lein-figwheel
23:31	lvh	you can't really use it without it AFAIK
23:32	lvh	justin_smith: sad but true :(
23:32	lvh	I guess I'll look into leiningen to see if I find any nrepl-specific stuff? Although I guess it's not just nrepl, it's any repl
23:33	lvh	I'm kind of hoping there's something I can call that will worry about project.clj's contents for me, and specifically knows all about :repl-opts and just.. does it
23:33	lvh	I guess lein repl is always nrepl? IIRC
23:33	justin_smith	yes, but "lein run -m clojure.main" gives a vanilla repl
23:34	lvh	amalloy: Thanks! :)
23:34	lvh	Ah :)