#clojure – 2015-05-11

2015-05-11

00:51	bucketh3ad	Is there any way to step through a call to reduce so I can see the intermediate values and figure out where my function is going awry?
00:52	Bronsa	,(reductions + '(0 1 2 3 4))
00:52	clojurebot	(0 1 3 6 10)
00:53	bucketh3ad	That might be helpful, but the reduce call is within a recursive loop, so the results will get thrown away before it returns the final value.
00:57	bucketh3ad	I could use that if I had a way to pause execution before the call to recur.
01:00	mavbozo	bucketh3ad, is logging the reductions result not possible?
01:05	bucketh3ad	That's what I ended up doing mavbozo. I also found this answer on stack overflow which is a pretty useful one-liner macro"
01:05	bucketh3ad	http://stackoverflow.com/a/2352280
03:45	sm0ke	if in lein i have a composite profile [:provided-pom-scope :test-pom-scope :shared] would the pom scopes be still preserved?
04:48	mnngfltg	I just came up with this way of applying operations conditionally in the thread-first macro: https://gist.github.com/pesterhazy/e191d0157b6f5cfe2ed8
04:49	mnngfltg	Is that useful? Am I reinventing something that already exists?
04:52	mpenet	,(doc cond->)
04:52	clojurebot	"([expr & clauses]); Takes an expression and a set of test/form pairs. Threads expr (via ->) through each form for which the corresponding test expression is true. Note that, unlike cond branching, cond-> threading does not short circuit after the first true test expression."
04:53	mnngfltg	Huh
04:53	mnngfltg	mpenet, true, but I'll have to specify a condition (true?) for every expression I'm threading
04:56	mnngfltg	thanks for the pointer though, that seems like what I'm looking for
04:56	mpenet	not necessarly
04:57	mpenet	,(-> {} (cond-> true (assoc :bar 1)))
04:57	clojurebot	{:bar 1}
04:57	mpenet	(-> {} (cond-> (true? true) (assoc :bar 1)))
04:57	mpenet	,(-> {} (cond-> (true? true) (assoc :bar 1)))
04:57	clojurebot	{:bar 1}
04:58	mpenet	it's more or less a macro version of what you wrote
04:58	mnngfltg	right, or I could use :alwaws
04:58	mpenet	(source cond->)
04:58	mpenet	,(source cond->)
04:58	clojurebot	Source not found\n
04:58	mpenet	,(clojure.repl/source cond->)
04:58	clojurebot	Source not found\n
04:58	mpenet	well
04:58	mnngfltg	I'll find the source :)
04:59	mpenet	(require 'clojure.repl)
04:59	mpenet	,(require 'clojure.repl)
04:59	clojurebot	nil
04:59	mpenet	,(clojure.repl/source cond->)
04:59	clojurebot	Source not found\n
04:59	mpenet	giving up :]
05:38	crazydiamond	Hi. Can anyone suggest way to create/delete Datomic DB synchronously?
05:43	ordnungswidrig	crazydiamond: create/delete a fact?
05:44	crazydiamond	ordnungswidrig, I get answer on #datomic now. The problem was that it's deleted and created in async way
05:44	crazydiamond	and I can't make a loop with schema changes
05:44	ordnungswidrig	crazydiamond: :-)
05:45	crazydiamond	but solution is always create new DB
05:45	crazydiamond	also, I'll probably use mem storage. so thanks for answering! :)
05:49	michaelr`	anyone knows of a cool compnay names generator?
05:49	michaelr`	juxt is take ;)
05:49	michaelr`	taken
05:51	ordnungswidrig	michaelr`: the swing demo application had a panel creating those.
05:51	wink	hmm, I only wrote a WoW guild name generator and a product name generator for our company :P
05:55	michaelr`	ordnungswidrig: which one?
05:55	ordnungswidrig	michaelr`: the swingset, I think
05:55	michaelr`	wink: can you generate a few names for me ;)
05:56	ordnungswidrig	michaelr`: I don't know if this is in jdk8 anymore
05:59	wink	michaelr`: you could just try creating a new github repo, it generates random names
05:59	wink	also, https://www.google.de/search?q=random+company+name ;)
06:01	michaelr`	yes, lot's of generators online but they don't give cool names by default
06:01	michaelr`	you'd need to give them some ideas for words to combine but I have none :)
06:01	wink	well yeah
06:02	wink	unless you want to name a company "The Epic Pirate Unicorns of Darkness" then my guild name generator wont help you either
06:03	wink	michaelr`: but feel free to be inspired, https://github.com/winks/GuildNameGenerator/blob/master/GNGText.luahttps://github.com/winks/GuildNameGenerator/blob/master/GNGText.lua
06:04	michaelr`	haha
06:33	borkdude	why is there no dissoc-in? :)
06:34	hyPiRion	borkdude: I think the problem was that it wasn't evident whether (dissoc-in {:foo {:bar {}}} [:foo :bar]) would return {:foo {}} or {}
06:36	bcn-flor	Hi ! I have a map with a tree of nodes, each node has a :children item with the child nodes, eg. {:title "Hi" :children {:title "Child1" :children {:title "Child1-1"}}}... I want to recursively remove (dissoc) some keys from all the nodes in tree. Can anyone point me towads the light ?
06:38	hyPiRion	bcn-flor: Children or just a single child? You example shows only a single map (presumably the child), not a sequence of children
06:40	bcn-flor	You're right, actually it's like this: {:title "a" :children [:child1 child2] :child1 {:title "a" :children [:child3 child4] :child3 {...} :child4 {...}}}
06:41	hyPiRion	ah
06:42	Bronsa	bcn-flor: look at clojure.walk/postwalk
06:45	bcn-flor	Bronsa: will do, thanks..
06:45	hyPiRion	I find it usually easier to just implement a recursive function. It would probably look something like (defn tree-dissoc [root key] (-> (reduce (fn [root' child] (update-in root' [child] tree-dissoc key)) root (:children root)) (dissoc key)))
06:48	bcn-flor	hyPiRion: yeah, I've been trying to build the two-liner for 3 hours.. but haven't tried with reduce
06:50	bcn-flor	hyPiRion: was trying to (merge (dissoc mymap :bad-key) mapped_children) , where mapped children is a recusrive map over the child nodes, converted back to {}. Doesn't work though
06:53	hyPiRion	bcn-flor: that should also work, but you have to use (apply merge ...) or (reduce merge)
06:54	hyPiRion	,(apply merge {:foo :z} [{:bar :a} {:baz :g}])
06:54	clojurebot	{:foo :z, :bar :a, :baz :g}
07:05	joelkuiper	I'm not sure if it's against the rules ... but there's a stackoverflow question that's been bothering me https://stackoverflow.com/questions/30081260/enumerate-namespaces-and-dynamically-load-them-in-clojurescript
07:25	borkdude	joelkuiper you can try something in combination with a macro or cljc?
07:25	borkdude	joelkuiper so the vars also are created in clojure/jvm
07:25	borkdude	joelkuiper and you can enumerate them from there and use that output in clojurescript
07:31	joelkuiper	borkdude: yeah, I guess something like that would work. It's a bit contrived though, since I'll be relying on the cljc compiler
07:32	joelkuiper	borkdude: In plain clj I would've probable tried to get the reified vars by name, but that's not an option in cljs
07:32	borkdude	joelkuiper you could write a macro that registers the var to a collection inside an atom when you define a component
07:33	borkdude	joelkuiper or just do it manually when you define a component
07:33	joelkuiper	borkdude: yeah that was my other thought ... I tried a similar approach without macro's but that lead to some circular dependencies in some edge cases
07:34	joelkuiper	borkdude: I could fix those cases probably, and indeed just call some (register component) fn that writes to an atom. Still have to list all the namespaces though
07:34	joelkuiper	but that's inevitable I guess
09:58	escherize	When I'm using emacs inside a clojure file, what's the best way to jump to or create its test file counter part??
09:58	lazybot	escherize: What are you, crazy? Of course not!
09:58	escherize	:(
09:59	timvisher	is there a library that makes the output of :pre and :post conditions a little more humane?
09:59	timvisher	like maybe printing the offending value and the expression that produced it?
09:59	hyPiRion	Raynes: I think lazybot's responses just cause confusion right now. People assume it's a serious reply
10:00	hyPiRion	isn't that true lazybot???
10:00	lazybot	hyPiRion: Oh, absolutely.
10:00	timvisher	i'll second hyPiRion here :)
10:00	wink	timvisher: if your values offend you and you need humane output, maybe try a badword censoring? ;)
10:01	escherize	I've been told pre and post conditions are a code smell.
10:02	bensu	escherize: what's the reasoning behind that?
10:06	escherize	If it's not clear enough with out them your functions need refactoring
10:06	escherize	Is what I was told
10:06	escherize	I dont actually use them either, though.
10:06	wink	it shouldn't be about clarity, imo
10:07	escherize	That's a good point. I usually use prismatic.schema/defn if I want to be explicit about preconditions. And havn't thought terribly hard about post conditions.
10:07	wink	invariants aren't bad, they're just not very commonly used. in any language
10:07	escherize	I use invariants a bit
10:07	wink	most people just seem to write tests instead :P
10:08	escherize	yeah I need to be writing more tests.
10:08	escherize	BTW: When I'm using emacs inside a clojure file, what's the best way to jump to or create its test file counter part??
10:08	lazybot	escherize: Definitely not.
10:08	escherize	Thanks lazybot
10:08	wink	stop using ?? then ;)
10:10	escherize	why??
10:10	lazybot	escherize: Uh, no. Why would you even ask?
10:11	escherize	lazy bot why must u harrass me??
10:11	lazybot	escherize: What are you, crazy? Of course not!
10:16	joelkuiper	hehe??
10:16	lazybot	joelkuiper: What are you, crazy? Of course not!
10:16	joelkuiper	nice
10:20	justin_smith	escherize: I know there is a function in cider to derive the recommended test file location given a namespace, so if there isn't a "jump to test file" already, it seems like it would be easy to write
10:23	bensu	justin_smith escherize: cider-test-infer-test-ns
10:24	justin_smith	bensu: thanks
10:24	justin_smith	(inc bensu)
10:24	lazybot	⇒ 1
10:24	bensu	justin_smith: you are right, ideally you would just (comp jump-to cider-test-infer-test-ns)
10:24	bensu	:)
10:24	justin_smith	bensu: I knew it was there, but not being a cider user myself it would be tricky to find :)
10:25	bensu	justin_smith: well, I remember because I customized it. It used to be: append "-test" to the ns
10:25	bensu	but I use preppend "test." to the namespace
10:26	justin_smith	oh, there would be an extra step, if it gives you the ns - you would also have to turn the ns into a path under test/
10:27	bensu	justin_smith: that's right!
10:28	escherize	(inc bensu)
10:28	lazybot	⇒ 2
10:29	escherize	I learned you can also projectile-find-test-file (in prelude C-c p T)
10:31	justin_smith	at my workplace, we tried to do a workshop on Friday to change colorization in cljs and cljc files via elisp. We hit some weird speed bumps.
10:39	escherize	like what justin_smith?
10:42	wasamasa	font-lock in emacs is generally weird
10:43	justin_smith	escherize: trying to override highlighting locally is weird. At first we just tried to apply a buffer-specific color scheme, but this just didn't seem to work (thought the docs seemed to claim it would).
10:43	justin_smith	root problem is probably just that we were a bunch of amateur elispers (despite being professional clojure devs) and should not have expected results in the first two hours of work.
10:44	escherize	sounds pretty scary to me
10:44	escherize	I'm getting back into learning about emacs - i just made an anki deck for prelude
10:46	escherize	also stuff like C-u C-u C-u C-n
10:47	wasamasa	justin_smith: I did for instance have to use M-x font-lock-fontify-buffer to reapply it interactively
10:47	justin_smith	escherize: alternately, M-4 C-n
10:47	wasamasa	justin_smith: doing so for a C buffer however... is slow as heck
10:48	justin_smith	wasamasa: ahh, maybe we got it right, but had to explicitly ask for refontification
10:48	wasamasa	justin_smith: it isn't necessary if you've just started writing a document though as it seems to do lazy contextual updates
10:48	escherize	justin_smith: C-u C-u C-u C-n moves down 64 lines
10:48	wasamasa	justin_smith: and many more weirdness :P
10:49	justin_smith	escherize: oh, I thought it went up by powers of 2
10:49	escherize	it's powers of 4 i guess, but even so M-4 C-n moves me 4 spots
10:50	justin_smith	escherize: C-u 64 C-n is still arguably better if I am avoiding chords, though it's not easier to type of course
10:50	escherize	I really should learn mark better.
10:51	escherize	yeah I don't use chords either
10:51	escherize	I think i might use helm till i die though
10:51	justin_smith	escherize: I actually switched to evil mode because I have some residual memory of vi, and wanted to cut back drastically on chord usage
10:52	escherize	with spacemacs?
10:53	justin_smith	no, I don't do canned configs, I just turned evil mode on
10:53	wasamasa	death to canned configs
10:55	broquaint	Quick straw poll - any one do mainly Java dev but use Clojure for poking about etc? (yes that's quite a hand-wavey question)
10:55	escherize	I didn't do much Java before I picked up Clojure
10:57	kaiyin	How do you create a byte in clojure?
10:58	broquaint	escherize: Me either, but I'm about to do a whole lot of Java :)
11:00	patrickgombert	kaiyin: https://clojuredocs.org/clojure.core/byte
11:01	kaiyin	patrickgombert: thanks. I am wondering what these two functions are for, they don't seem to do anything: https://github.com/smee/binary/blob/master/src/org/clojars/smee/binary/core.clj#L29-L35
11:01	kaiyin	or maybe i still don't quite understand the difference between byte and unsigned byte.
11:03	patrickgombert	kaiyin: Java doesn't have unsigned types afaik
11:03	escherize	looks like they swap between 2s compliment unsigned notations
11:04	escherize	byte being signed?
11:05	kaiyin	escherize: that only matters when you convert it to an int, right?
11:05	hyPiRion	or from an int to a byte
11:05	hyPiRion	,(unchecked-byte 255)
11:05	clojurebot	-1
11:10	kaiyin	hyPiRion: yeah.
11:10	kaiyin	how exactly does this convert a byte into a unsigned byte? (defn byte->ubyte [b] (int (bit-and b 255)))
11:12	hyPiRion	,(bit-and (byte -20) 255)
11:12	clojurebot	236
11:12	hyPiRion	the int wrapper just ensures it's an integer instead of a long, I guess
11:13	hyPiRion	,(bit-and (byte -20) (unchecked-byte 255)) ;; => -20
11:13	clojurebot	-20
11:15	kaiyin	hyPiRion: ok, this means (int ...) turns -20 into 236?
11:16	hyPiRion	I probably confused you with the byte calls. Better example:
11:16	hyPiRion	,(bit-and -20 255)
11:16	clojurebot	236
11:17	hyPiRion	-20, which presumably is a byte, is converted into a long, which is then bit-anded with 255 (lowest 8 bits). Finally it's cast to an int.
11:19	kaiyin	well, why should bit-and do anything to -20 in this case? 255 is just 11111111.
11:19	kaiyin	why is it converted to a long first?
11:20	hyPiRion	kaiyin: because 255 is a long
11:20	kaiyin	ah, ok.
11:21	hyPiRion	I'm pretty sure the behaviour is equal in Java, actually. (byte)-20 & (long)255 should yield 236 as a long.
11:21	kaiyin	but still, why doesn't (bit-and -20 255) return -20?
11:23	kaiyin	,(Integer/toString -20 2)
11:23	clojurebot	"-10100"
11:25	hyPiRion	yeah, that's a stupid way of representing it.
11:25	hyPiRion	Or well, it's not stupid, but it's confusing.
11:25	hyPiRion	,(defn bitify [n] (apply str (for [b (range 32 -1 -1)] (bit-and 1 (bit-shift-right n b)))))
11:25	clojurebot	#'sandbox/bitify
11:25	hyPiRion	,(bitify -20)
11:25	clojurebot	"111111111111111111111111111101100"
11:25	hyPiRion	,(bitify 255)
11:25	clojurebot	"000000000000000000000000011111111"
11:26	hyPiRion	,(bitify (bit-and -20 255))
11:26	clojurebot	"000000000000000000000000011101100"
11:26	hyPiRion	kaiyin: Does it make more sense now, or is it still black magic?
11:27	mikerod	Does anyone have a good way to type hint the return value of an anonymous function?
11:27	mikerod	I found this to be surprisingly difficult/impossible?
11:28	mikerod	I don't mean to type hint it when you call it.
11:31	bensu	I remember a google group discussion about this
11:31	bensu	mikerod: ^
11:32	mikerod_	Hmm, I guess I'll start searching then
11:32	bensu	https://groups.google.com/forum/#!topic/clojure/2DyGQ6fH1ZU
11:32	bensu	not sure if it leads somewhere
11:33	mikerod_	some initial searching has left me empty of ideas. I could just read some compiler and see probably.
11:33	puredanger	mikerod_: there is a ticket related to that that was fixed in 1.7
11:33	mikerod_	puredanger: oh, interesting
11:33	puredanger	http://dev.clojure.org/jira/browse/CLJ-1378
11:34	bensu	mikerod_: who needs google when you have puredanger? :)
11:34	puredanger	some day I will reclaim my memory of thousands of JIRA tickets and be able to remember other general knowledge
11:35	mikerod_	(inc puredanger)
11:35	lazybot	⇒ 49
11:35	mikerod_	puredanger: that was some amazingly fast Jira link response time
11:35	mikerod_	I've actually read this Jira before myself - and forgot about it...
11:35	mikerod_	thanks!
11:35	puredanger	I have a lot of them memorized unfortunately
11:36	puredanger	hyPiRion: there is also http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#toBinaryString(int) for binary string conversion btw
11:36	kaiyin	hyPiRion: that's cool. totally makes sense.
11:36	puredanger	(Integer/toBinaryString -20)
11:37	puredanger	,(Integer/toBinaryString -20)
11:37	clojurebot	"11111111111111111111111111101100"
11:37	hyPiRion	puredanger: That's convenient, didn't know about that one.
11:37	puredanger	also toHexString, etc
11:37	Bronsa	(inc puredanger)
11:37	lazybot	⇒ 50
11:37	hyPiRion	(inc puredanger)
11:37	lazybot	⇒ 51
11:43	escherize	(inc puredanger)
11:43	lazybot	⇒ 52
11:44	escherize	does this oracle end of lifing java have any effect on me a humble clojure dev?
11:45	TimMc	escherize: You mean EOL'ing Java 7?
11:45	TimMc	Unless I've missed some pretty big news.
11:46	escherize	Yes thats what i meant
11:49	puredanger	it means you won't get security updates on Java 7 unless you pay oracle
11:49	puredanger	other than that, no
11:49	escherize	(inc puredanger)
11:49	lazybot	⇒ 53
11:50	puredanger	I expect we will remove java 6 support from Clojure in the next release or two
11:50	TimMc	puredanger: I read that as "add java 6 support to Clojure" :-D
11:52	TimMc	escherize: It means you should feel a little more free to use features introduced in Java 8 and should probably not have Java 7 the default on your own computers.
11:52	escherize	I havent written any java in like 3 years
11:53	TimMc	escherize: You use the Java libraries and JVM features from Clojure so that's neither here nor there.
11:54	escherize	But I dont breathe any style into them
11:57	puredanger	"next release" not including Clojure 1.7 that is
12:18	marcoslamuria	Hi folks, I have a question about types and protocols
12:20	marcoslamuria	is anyone here?
12:21	Bronsa	marcoslamuria: ask your question and you might get an answer
12:21	marcoslamuria	is it possible to have a type that extends another type and implements a protocol?
12:22	Bronsa	no. deftype doesn't support type inheritance
12:23	marcoslamuria	humm
12:24	marcoslamuria	ok thanks
12:24	patrickgombert	marcoslamuria: it can happen with some macro magic (eg https://github.com/sdegutis/oops)
12:26	marcoslamuria	humm
12:26	marcoslamuria	let me see
12:27	Bronsa	patrickgombert: he asked about extending a type to another type. that's not possible no matter how many layers of macros you use, deftype simply doesn't allow it
12:28	patrickgombert	yeah, you're right... it might be possible to do something similar though
12:29	Bronsa	i might be wrong but the way he phrased the question, it sounded like he wanted concrete type inheritance, not mixins
12:29	marcoslamuria	yeh a want concrete type
12:30	marcoslamuria	ok, no problem.. I'll find another way to do what I need
13:13	clojer	Is there a significant difference between reloading a Clojure web app (eg. Luminus) already loaded into a REPL and reloading a Scala/Play2 app compiled inside InteliJ? I'm trying to understand how Clojure REPL editing differs from Scala/SBT reloading.
13:18	wasamasa	I'd describe it for lisp generally as "additive"
13:18	wasamasa	where a few dialects like clojure or racket offer the option to flush out everything and replace it with a clean slate
13:19	clojer	wasamasa: Does this mean with Clojure you're not actually recompiling after an edit but in Scala/Java it's always a full recompile?
13:20	wasamasa	clojer: you recompile selectively
13:20	wasamasa	clojer: or compile a new addition
13:20	wasamasa	clojer: I didn't try out scala, but I can confirm that for java you need a full recompile, yes
13:21	clojer	wasamasa: So as your codebase increases that could make a big difference in your edit/reload cycle?
13:21	wasamasa	clojer: yes
13:21	wasamasa	clojer: it also makes for fun bugs you only encounter while developing :P
13:21	wasamasa	clojer: so there's that
13:22	clojer	wasamasa: Are you saying you find these bugs better with Clojure?
13:22	wasamasa	clojer: no, I mean that if you for instance evaluate version A of a function, decide to change it to version B and rename it
13:23	wasamasa	clojer: code still using the old name will keep using the old definition
13:23	wasamasa	clojer: so you won't run into an error telling you the function isn't defined because you're additively accumulating state
13:23	justin_smith	see also redefinition of defrecord
13:23	justin_smith	(related but different error)
13:24	wasamasa	clojer: and only cleaning up the namespace (be it with advanced trickery or a REPL restart) will make that obvious
13:24	wasamasa	clojer: what I'm trying to convey is that it's a mixed bag for me, on the one hand very useful because it makes for a faster workflow, on the other hand messier
13:26	clojer	wasamasa: Does clojure.tools.namespace.repl cover all these bases safely?
13:27	wasamasa	clojer: C-c C-x does that namespace cleanup here, I don't appear to have the necessary middleware installed for it though
13:29	justin_smith	clojer: clojure.tools.namespace.repl/refresh works well, though you need to code your app so that it won't break (by using defonce for things that carry state for example)
13:29	clojer	Thanks. Have to dash.
13:35	goracio	hi, are there any monger users ?
13:36	goracio	i got something like that {:_id #<ObjectId 554e4552162a0207b425a903>, :title "First article"} how i can transform _id key to just int ?
13:53	jlegler	You don't have much of a say in that unless you yourself will be generating the ids.
13:53	jlegler	You can ignore them and put int your own int ids if you want to use ints.
13:54	jlegler	The _int paradigm is a mongo thing, not a monger thing.
13:58	jlegler	the _id thing I mean. Mongo doesn't use ints for ids.
14:12	djames	I'm wondering about pub-sub options in Clojure ... perhaps over nrepl or ZeroMQ. Any suggestions on what to look at?
14:12	djames	Also interested in how lightweight one could make a JVM process to serve as an nrepl server
14:29	wasamasa	lol
14:31	justin_smith	djames: grench exists as a lightweight nrepl client (written in ocaml)
14:31	djames	justin_smith: thanks, will look
14:31	djames	I think I'll look closer at Netty too
14:44	goracio	hey there ) given [{:a 1} {:b 2}] how to change :a value with string 1-> "1" in each map in vec
14:44	goracio	and return [{:a "1"} {:b 2}]
14:50	justin_smith	,(map #(reduce-kv (fn [m k v] (assoc m k (if (= k :a) (str v) v))) {} %) [{:a 1} {:b 2}])
14:50	clojurebot	({:a "1"} {:b 2})
14:56	goracio	justin_smith: this is crazy )
14:56	goracio	(map #(update-in % [:_id] str) ( [{:a 1} {:b 2}]))
14:57	goracio	,(map #(update-in % [:a] str) ( [{:a 1} {:b 2}]))
14:57	clojurebot	#error{:cause "Wrong number of args (0) passed to: PersistentVector", :via [{:type clojure.lang.ArityException, :message "Wrong number of args (0) passed to: PersistentVector", :at [clojure.lang.AFn throwArity "AFn.java" 429]}], :trace [[clojure.lang.AFn throwArity "AFn.java" 429] [clojure.lang.AFn invoke "AFn.java" 28] [sandbox$eval55 invoke "NO_SOURCE_FILE" 0] [clojure.lang.Compiler eval "Compil...
14:57	goracio	,(map #(update-in % [:a] str) [{:a 1} {:b 2}])
14:57	clojurebot	({:a "1"} {:b 2, :a ""})
14:59	goracio	ah sorry [{:a 1} {:a 2}] this is the case )
14:59	goracio	,(map #(update-in % [:a] str) [{:a 1} {:a 2}])
14:59	clojurebot	({:a "1"} {:a "2"})
15:20	justin_smith	goracio: if you always expect an :a key, yes update-in is simpler. But the reduce-kv (or something equivalent) is needed if the :a key may not be present
15:21	goracio	ок
15:21	justin_smith	also you can use update instead of update-in for this case
15:21	justin_smith	,(map #(update % :a str) [{:a 0} {:a 1}])
15:21	clojurebot	({:a "0"} {:a "1"})
15:22	justin_smith	with newer clojure versions
15:22	amalloy	,clojure-version
15:22	clojurebot	{:major 1, :minor 7, :incremental 0, :qualifier "master", :interim true}
15:23	amalloy	justin_smith: 1.7 isn't even out yet, right? so you have to be running an alpha to use update
15:23	justin_smith	or a beta, yeah
16:03	amalloy	cfleming: intellij keeps giving me warning messages like "The directory /Users/.../myproj/ is under Git, but is not registered in the Settings". do you know what the deal is with that? the best i could find online was a 2-year-old SO question with the answer "you can't do anything about it"
16:04	cfleming	amalloy: You should be able to fix that - go to Settings->Version Control and set up the directory as a git root
16:05	amalloy	cfleming: that's fine, but it does this for every project
16:05	amalloy	why do i need to keep adding them as git roots?
16:05	cfleming	amalloy: But once you've configured it for a particular project it stops, right?
16:05	amalloy	i think so
16:06	cfleming	ok
16:06	cfleming	So you just want to turn that warning off?
16:06	goracio	is there are any way to run server and figwheel in one process ? or in one repl ?
16:06	amalloy	i don't know. i want to know why that warning exists, so i know what i should do about it, which might be turning off the warning
16:08	cfleming	amalloy: So IntelliJ has to have that configured so that its VCS integration works. In multi-module projects these setups can get pretty complex (i.e. multiple VCSes or multiple roots for a single IntelliJ project)
16:08	amalloy	can i uh...turn off VCS integration?
16:08	cfleming	amalloy: So generally in those settings you configure this. Since people might not realise that they have to do that, IntelliJ warns you when it hasn't been done.
16:09	cfleming	amalloy: Sure - if you only ever use Git on the command line, Settings->Plugins and remove Git
16:09	amalloy	aha
16:09	amalloy	thanks
16:13	cfleming	amalloy: While you're there, it's generally a good idea to remove any other plugins you're not using too
16:13	amalloy	yeah, i did
16:18	goracio	so ?
16:25	cfleming	goracio: Try asking in #clojurescript
16:25	cfleming	goracio: brucehauman (the Figwheel author) hangs out in there
16:26	goracio	ok
17:15	hyPiRion	Is the common pattern when you have a protocol definition and want to provide a default implementation for one of the protocol methods to split it into two protocols?
17:27	the-kenny	hypirion: I think so, yes.
17:28	hyPiRion	thanks
17:59	kaiyin	,(aset ^ints int-array 4 5) why do we need the ^ints here, since it's obviously an int-array?
18:00	clojurebot	#error{:cause "clojure.core$int_array cannot be cast to [I", :via [{:type java.lang.ClassCastException, :message "clojure.core$int_array cannot be cast to [I", :at [sandbox$eval25 invoke "NO_SOURCE_FILE" -1]}], :trace [[sandbox$eval25 invoke "NO_SOURCE_FILE" -1] [clojure.lang.Compiler eval "Compiler.java" 6792] [clojure.lang.Compiler eval "Compiler.java" 6755] [clojure.core$eval invoke "core.clj" ...
18:00	kaiyin	,(aset ^ints int-array 4 5)
18:00	clojurebot	#error{:cause "clojure.core$int_array cannot be cast to [I", :via [{:type java.lang.ClassCastException, :message "clojure.core$int_array cannot be cast to [I", :at [sandbox$eval49 invoke "NO_SOURCE_FILE" -1]}], :trace [[sandbox$eval49 invoke "NO_SOURCE_FILE" -1] [clojure.lang.Compiler eval "Compiler.java" 6792] [clojure.lang.Compiler eval "Compiler.java" 6755] [clojure.core$eval invoke "core.clj" ...
18:01	kaiyin	sorry, my bad.
18:01	kaiyin	,(def i (int-array [0 1 2 3 4 5 6]))
18:01	clojurebot	#'sandbox/i
18:02	kaiyin	,(aset ^ints i 4 5)
18:02	clojurebot	5
18:04	amalloy	kaiyin: why is it obviously an int-array?
18:04	kaiyin	well, it's generated by int-array.
18:06	TimMc	kaiyin: Clojure's compiler doesn't do very much type inference.
18:06	amalloy	kaiyin: once you def it to something, it's just a var with an unknown value. that's the downside of dynamic typing
18:06	TimMc	Also, that ... yeah, what he said.
18:06	amalloy	of course you don't need the ^ints hint - it still works fine without it, but it's faster if you hint it
18:08	kaiyin	ok, got it.
19:58	escherize	Good news! I merged a cljs project into a clojure project! (I started them seperately for some reason.)
19:58	escherize	What's the best approach for deployment? I guess it doesn't matter
19:59	escherize	my previous workflow is a script that ssh's in, git pulls a tag, and restarts the app
19:59	escherize	but with the cljsbuild step, should I actually commit my advanced compiled javascript files in the repo?
20:02	justin_smith	escherize: git and lein on prod is a bad idea anyway
20:03	justin_smith	create your js while generating an uberjar
20:04	escherize	oh really, justin_smith? Lein I can understand, but why is git a bad idea on prod? I worked at a sizable clojure shop for a while and never encountered this line of thought
20:04	escherize	also you're On the Money with the uberjar idea
20:05	justin_smith	escherize: git on prod means an intruder gets to not only your server instance, but your repository.
20:05	justin_smith	which means they can backdoor not just a machine, but your infrastructure
20:06	justin_smith	and also uberjars are just simpler - you just deploy one artifact, and maybe a couple of scripts
20:08	escherize	thanks man
20:08	escherize	I wonder if I still have git access.. over there.. :)
20:09	justin_smith	haha
20:09	escherize	so totally unrelated.. what's a good way to ransom a set of servers.. or sell trade secrets on the black market?
20:16	cfleming	Does proxy propagate type hints to the parameters of method implementations?
20:18	amalloy	cfleming: reify certainly does. i'm not sure about proxy; the code for that is pretty complicated
20:19	cfleming	amalloy: Yeah deftype/defrecord do as well
20:19	amalloy	right, those are basically the same code
20:19	cfleming	amalloy: Looks like it doesn't
20:20	cfleming	,(binding [warn-on-reflection true] (proxy [MouseAdapter] [] (mousePressed [event] (.getButton event))))
20:20	clojurebot	#error{:cause "Can't resolve: MouseAdapter", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.Exception: Can't resolve: MouseAdapter, compiling:(NO_SOURCE_FILE:0:0)", :at [clojure.lang.Compiler macroexpand1 "Compiler.java" 6644]} {:type java.lang.Exception, :message "Can't resolve: MouseAdapter", :at [clojure.core$proxy$fn__5707 invoke "core_proxy.clj" 329]}], :trace [[clo...
20:20	cfleming	,(binding [warn-on-reflection true] (proxy [java.awt.event.MouseAdapter] [] (mousePressed [event] (.getButton event))))
20:20	clojurebot	#object[sandbox.proxy$java.awt.event.MouseAdapter$ff19274a 0xfe6ce0c "sandbox.proxy$java.awt.event.MouseAdapter$ff19274a@fe6ce0c"]
20:21	amalloy	cfleming: binding doesn't work there
20:21	cfleming	Hmm, I guess clojurebot doesn't show the warnings, but I get one in my REPL here
20:21	amalloy	because the binding applies to runtime, but you want to set it at compile time
20:21	cfleming	It doesn't?
20:21	cfleming	Actually I .... right
20:21	amalloy	cfleming: you shouldn't, if you were actually using binding and not set!
20:22	cfleming	amalloy: I used set! here
20:22	cfleming	(set! warn-on-reflection true)
20:22	cfleming	,(set! warn-on-reflection true)
20:22	clojurebot	#error{:cause "Can't change/establish root binding of: warn-on-reflection with set", :via [{:type java.lang.IllegalStateException, :message "Can't change/establish root binding of: warn-on-reflection with set", :at [clojure.lang.Var set "Var.java" 221]}], :trace [[clojure.lang.Var set "Var.java" 221] [sandbox$eval75 invoke "NO_SOURCE_FILE" -1] [clojure.lang.Compiler eval "Compiler.java" 6792] ...
20:22	cfleming	Meh
20:22	cfleming	Anyway, I get a warning, so I guess hints are not propagated for proxy
20:23	amalloy	yeah. i was trying to read through the source for proxy to find out, but your way is better
20:23	cfleming	Yeah, often the code is just too complicated to figure out reliably
20:24	cfleming	I'm adding type inference for Java interop, should be pretty nice - type aware autocompletion etc
20:24	escherize	nice
20:25	amalloy	cfleming: how do you plan for it to work when the target object isn't known yet? eg in (.foo bar), how can you help me with typing foo?
20:26	cfleming	amalloy: You'll be able to type (bar .fo<caret>), when you autocomplete I'll convert that to (.foo bar <caret>)
20:27	cfleming	amalloy: In cases where the type is already present that won't be necessary, like if you wrap an existing form and then start typing (so the second form is already there)
20:27	cfleming	amalloy: The second form is also implicitly already there in threading forms etc
20:28	amalloy	interesting. what about not even requiring the parens or the space, so it looks like i'm typing a java method invocation? bar.foo<tab> -> (.foo bar)
20:29	cfleming	I thought about that, it's a little trickier since bar.foo is normally resolved as a single symbol - I might be able to make that work though. The form with the space is more consistent when the first form is e.g. a list
20:29	cfleming	i.e. ((.method object).otherMethod<caret>)
20:31	crack_user	hello guys
20:31	amalloy	oh sure, i forgot foo.bar already looks like a classname
20:31	crack_user	someone knows what can cause this error? java.lang.IllegalArgumentException: No implementation of method: :success? of protocol: #'buddy.auth.accessrules/IRuleHandlerResponse found for class: buddy.auth.accessrules$success
20:32	cfleming	amalloy: In cases where it's really unknown I can also be smarter now by walking all available local symbols, looking at their types, and offering methods available on those types
20:32	amalloy	crack_user: you probably reloaded the namespace containing a protocol definition, while leaving around instances of the old protocol
20:33	cfleming	amalloy: right, I can special case that though, so if foo.bar looks like a classname but doesn't actually resolve to a class I can then do a secondary search
20:59	escherize	anyone seen java.lang.NoClassDefFoundError: clojure/tools/logging/impl/LoggerFactory before?
21:04	justin_smith	escherize: with clojure.tools.logging you can provide an implementation (sl4j or log4j are the main ones iirc) - it can't depend on either, but one of them has to be present
21:05	escherize	Ahh thank you
21:06	amalloy	cfleming: i had a clojure file with some usages of class Foo in it, which were correctly flagged by cursive as errors, because i hadn't added an import for Foo. then in emacs, i added an import for Foo. now cursive still thinks the usages of Foo are unresolved and i have an unused import of Foo in my ns form
21:10	amalloy	cfleming: i think it's because i also added the dependency to my project.clj, but cursive hadn't reloaded/synced it. a bit weird that it thought the imports were unused as well as being unresolvable, but i guess as long as it flags them as unresolvable it's not a huge deal that it also flags them as unused
21:12	escherize	how do I put the log4j jar on the classpath, like it says to do in https://github.com/clojure/tools.logging
21:13	justin_smith	escherize: add log4j as a dep in project.clj
21:13	escherize	I downloaded apache-log4j-2.2-bin.tar.gz and it unzips into a folder with a lot of jars in it.
21:13	escherize	derp
21:17	escherize	so then, the vector I added to :dependencies is [org.apache.logging.log4j/log4j-core "1.2.17"]
21:18	escherize	but that is wrong :)
21:18	escherize	http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
21:18	escherize	lein could not find the artifact in maven or clojars (probably it will be in maven?)
21:19	escherize	oh yeah i got it.
21:19	escherize	[org.apache.logging.log4j/log4j-core "2.2"] worked. Thanks again justin_smith
21:19	escherize	(inc justin_smith)
21:19	lazybot	⇒ 252
21:46	escherize	well, I'm still getting the same problem. It looks like I'm using the wrong neo4j? the clojure.tools.logging wants the one listed here https://github.com/clojure/tools.logging/blob/master/src/main/clojure/clojure/tools/logging/impl.clj#L145 , but The only two I can find are [org.apache.logging.log4j/log4j-core "2.2"] and [log4j/log4j "1.2.17"]
21:47	escherize	so I'm pretty confused about how to pull "org.apache.log4j.Logger" into my project.
21:48	justin_smith	wait, that's a version?
21:48	justin_smith	log4j-core 2.2 shoudl provide org.apache.log4j.Logger
21:49	escherize	I'm using [org.apache.logging.log4j/log4j-core "2.2"]
21:50	escherize	so I'm thinking (Class/forName "org.apache.log4j.Logger") should just work?
21:50	justin_smith	that's what I thought...
21:50	justin_smith	it is definitely provided by log4j 1.2 https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html
21:50	justin_smith	perhaps it is missing from 2.x
21:50	escherize	is there a special place to put the log4j.properties file?
21:51	justin_smith	it just needs to be on classpath
21:51	escherize	so, I've tried: [log4j/log4j "1.2.17"]
21:53	escherize	it's in ./resources so that should be ok
21:55	escherize	cool, so (Class/forName "org.apache.log4j.Logger") works from the repl. but lein uberjar is throwing the same error.
21:55	justin_smith	try lein do clean, uberjar
21:59	amalloy	lein do clean, clean, clean, uberjar just in case
21:59	justin_smith	haha
21:59	escherize	ikr
21:59	escherize	I bet my uberjar task is fudged.
21:59	justin_smith	in all seriousness, I have had situations where I changed my deps and uberjar went wrong until I did an explicit clean
22:00	cfleming	amalloy: Right, if Cursive can't resolve the class correctly it can't know that the import and the class usage are the same class
22:01	cfleming	amalloy: Well, anything is possible, obviously, but that's all built around class resolution now
22:43	escherize	ouch, my brain. So my main file won't compile because no logging factory. Then I import the logging factory in the same repl: https://gist.github.com/f2143af6deb55923676b
22:52	justin_smith	escherize: I don't know what's going on there
22:53	justin_smith	escherize: do you have to tell it to use a particular impl?
23:10	loke	I have a long list of things, and I want to apply a transformation on the first element that matches a certain criteria. Right now I've implemented it as such: (map (fn [v] (if (criteria v) (dosomething v) v) some-list). However, this has two problems: 1) It applies the function on every single element when it would be efficient to stop after the first one that matches criteria and 2) if I really want to prevent processing of subsequent matches, I need a stat
23:10	loke	e variable to track that. Is there a better solution?
23:13	justin_smith	,(loop [acc [] [e & r] [2 4 6 7 8 10]] (if (odd? e) (into (conj acc (inc e)) r) (recur (conj acc e) r)))
23:13	clojurebot	[2 4 6 8 8 ...]
23:13	justin_smith	that's one way to do it at least
23:14	loke	justin_smith: Thanks
23:15	loke	justin_smith: Another solution I was thinking of was to first get the index of the first match and then use a single conj on that element. Would that be more efficient?
23:17	justin_smith	I wanted to use reduce / reduced, but it needs to use the remains of the coll
23:17	justin_smith	could be, if the input is a vector
23:17	loke	The input is indeed a vector
23:18	loke	I was surprised to notice that standard clojure doesn't seem to have an equivalent of CL's POSITION function. Or did I miss something?
23:19	justin_smith	loke: many functions aren't implemented in clojure if they don't have a fast solution (not sure if that's why position is missing though)
23:24	justin_smith	eg. that's definitely why we have hashtables but no alists
23:24	loke	Interesting
23:25	loke	Alists are faster than hashtables though, up to some value of n.
23:25	loke	I have no idea what n is, which might be the reason why it's not supported.
23:25	justin_smith	that's true, but clojure opts not to implement them (it's biased toward fancy data structures)
23:26	justin_smith	loke: small hashtables may be something close to that, but they autopromote
23:26	justin_smith	,(type {:a 0})
23:26	clojurebot	clojure.lang.PersistentArrayMap
23:26	loke	justin_smith: Yes. It's clearly a very different application. The application I'm working on has the server written in Common Lisp, but the client side were recently rewritten in clojurescript, which is why I'm here askign questions. :-)
23:27	justin_smith	,(type (reduce conj {:a 0} (repeat 100 [1 2])))
23:27	clojurebot	clojure.lang.PersistentArrayMap
23:27	justin_smith	hmm... I think I did that wrong
23:28	justin_smith	oh, of course, lol
23:29	justin_smith	,(type (into {:a 0} (map vector (range 1000) (range)))
23:29	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
23:29	justin_smith	,(type (into {:a 0} (map vector (range 1000) (range))))
23:29	clojurebot	clojure.lang.PersistentHashMap
23:29	justin_smith	there we go
23:29	justin_smith	repeating the key won't force the switch :)
23:30	justin_smith	more info http://clojure.org/data_structures#Data%20Structures-ArrayMaps
23:30	puredanger	of course that may all change post 1.7 with unrolled small collections :)
23:30	justin_smith	puredanger: what difference would you expect to see?
23:31	puredanger	array maps will basically be replaced a family of N-pair map implementations
23:31	justin_smith	ahh
23:31	puredanger	up to some TBD N
23:31	justin_smith	so the same kind of unrolling we see for arities in clojure.core
23:31	puredanger	yeah, code generated
23:32	puredanger	given the typical distribution for map sizes, it might be a significant bump in perf
23:33	puredanger	I can't remember what Zach measured in his impl but it was bigger than I expected
23:35	puredanger	creation time was 5x faster than PAM