#clojure – 2015-05-20

2015-05-20

00:19	credulous	Hello. I am trying to learn emacs and clojure at the same time. This may not be wise. Questions are emerging.
00:21	credulous	One question I currently have: how do people conveniently run a web server within emacs? I have been running lein ring server from within an emacs terminal, but startup times are long.
00:21	credulous	Is there a constantly running server, maybe within nRepl, that can reload code on the fly?
00:29	ballpointcarrot	credulous: have you looked into http-kit? It seems to have a hot reload: http://www.http-kit.org/migration.html#reload
00:30	ballpointcarrot	or, just do a search for ring.middleware.reload; it may help instead of killing/restarting ring
00:32	credulous	thanks, ballpointcarrot I'll look into that now
02:56	[mad]	hi
03:31	tdammers	any vim-fireplace gurus here?
03:31	tdammers	I'd like to disable how fireplace changes what vim considers a "word"
03:31	tdammers	is there an easy way to do that without hacking fireplace.vim itself?
03:49	oddcully	tdammers: i sometimes stumble over them too (e.g. /), but i have left them alone for now, since most of the time they work
03:49	oddcully	tdammers: the way i'd try to do that:
03:50	oddcully	tdammers: add an "after" ftplugin and put your `set keyword-=<thechar?` there
03:52	oddcully	tdammers: it's actually `set iskeyword-=...`
03:53	zot	in cider, if I have a stacktrace that points to query.cljc, and I have 2 files (in different subtrees/namespaces) named query.cljc, it often goes to the wrong file when I press enter. any clues on how to give it enough information to go to the right file?
03:58	oddcully	tdammers: works. put `set iskeyword-=/` in your `~/.vim/after/ftplugin/clojure.vim`
04:03	tdammers	ah cool
04:03	tdammers	will try
04:04	tdammers	btw, the reason I don't want to treat / as a kw char is because it makes no sense in file paths and such
04:04	tdammers	and ofc consistent behavior across all the languages I use
04:11	tdammers	oddcully: the -=/ thing works, thanks
04:11	oddcully	yw
04:13	tdammers	while we're discussing fireplace, I noticed that :Require(!) does not reliably show compilation errors
04:13	tdammers	it says that it reloads, and everything seems to be working, and then when I restart the entire thing, it fails to compile because there's a syntax error somewhere
04:20	wagjo	I have stateless cloud instances and I'm looking for some approach to pass configuration to them upon start. Any best practices for that? Was thinking about storing it in s3 object, or using zookeeper but the latter may be an overkill
04:21	tdammers	I wonder if that's a problem with fireplace or with nrepl
04:55	okal	Not sure if this is the right place to do this, but is it possible to use inline dependencies, so as to have auto reloading in leiningen when you change a file in a 3rd party lib?
04:55	okal	s/to do/to ask/g
04:59	Seylerius	Is there a parallel equivalent to mapv?
05:00	kaiyin	Is there any performance penalty in using https://github.com/Prismatic/schema ?
05:01	slipset	Seylerius: don't quite know, but https://www.youtube.com/watch?v=BzKjIk0vgzE is a nice video on the subject
05:01	Seylerius	slipset: Thanks.
05:02	slipset	Seylerius, you're basically looking at mapv because of side-effects, right?
05:03	Seylerius	slipset: I'm looking at mapv because get/assoc prefer vectors.
05:03	slipset	ah, ok.
05:04	slipset	I've generally used mapv because I'm to lazy to figure out how doseq works
05:04	pastafari	Seylerius: what about (comp vec pmap)
05:49	justin_smith	~pmap
05:49	clojurebot	pmap is not what you want
05:50	hyPiRion	hah
05:50	hyPiRion	claypoole is probably more like what you want
06:36	justin_smith	gfredericks: this seems up your alley https://plus.google.com/101584889282878921052/posts/Fni6x2TTeaS
07:06	donbonifacio	my app on heroku keeps taking more than 60s to boot and heroku kills it. I have it precompiled. Is there anything I can do to speed things up?
07:06	donbonifacio	btw my feeling is that the newrelic agent takes the majority of time
07:07	Empperi	how about doing stuff lazily after starting your app?
07:07	donbonifacio	it timeouts _before_ getting to main
07:07	Empperi	ok, you have something seriously funky going on there
07:08	donbonifacio	yes, newrelic agent
07:09	Empperi	anyway, if it dies before getting to main then most likely your library stuff is doing a lot of work in static constructors in java
07:10	Empperi	you could load those classes lazily within your -main
07:10	Empperi	so instead of requiring/importing stuff at the ns level do that explicitly inside -main
07:10	Empperi	and only when it is absolutely necessary
07:11	donbonifacio	kay, I'll investigate, thanks :)
07:13	Empperi	hope that helps
08:08	kaiyin	core.typed has not effect at run time, right?
08:08	kaiyin	s/not/no
08:33	ambrosebs	kaiyin: as of today you can hook it into the compilation process, if that's what you mean
08:34	ambrosebs	kaiyin: there's no type based optimisations yet
08:35	kaiyin	ambrosebs: so after an annotated func is compiled, it will still report type error when it occurs?
08:36	ambrosebs	kaiyin: if the current namespace is "typed", yes
08:37	ambrosebs	try it out here https://github.com/typedclojure/typed-repl
08:43	kaiyin	ambrosebs: I got stackoverflow error when loading this into repl: https://gist.github.com/kindlychung/2d73bbc2f46ff713535e
08:44	kaiyin	ambrosebs: version 0.2.92
08:45	ambrosebs	don't add a self-recursive check-ns in a namespace
08:45	gfredericks	justin_smith: the way the numbers grow reminds me of goodstein numbers, which start 2,4,6,(3*2^402653211-2), ...
08:46	ambrosebs	either do it at the REPL or add ^:core.typed metadata to the namespace with the project.clj nrepl middleware described in that project
08:49	kaiyin	ambrosebs: doing it in repl gives CompilerException java.lang.RuntimeException: No such namespace: -t
08:51	kaiyin	ambrosebs: I have to leave for something else, will continue this later, thanks a lot!
08:52	ambrosebs	kaiyin: thanks for the report though, that's a regression.
08:52	ambrosebs	should be a better error
09:01	mrb_bk	Anyone got recommendations for a good read on packaging/deploying simple Clojure web apps? I have a little 3 route ring JSON API that I want to launch as an executable
09:04	vijaykiran	mrb_bk: generating an uberjar and using a small script to java -jar uberjar.jar should work
09:20	justin_smith	for extra credit, you can use jsvc by making it implement the daemontools interface
09:20	justin_smith	(this has uberjar as a pre-requisite)
09:25	entity	hello, I'm thinking about developing a genetic algo. in Clojure and I need some kind of a fast data structure to hold the genetic information, which would look something like (up down right right ...); i.e. listing actions to take in certain situations
09:26	entity	no sure if that makes much sense
09:26	entity	not*
09:32	mrb_bk	This looks reasonable https://devcenter.heroku.com/articles/clojure-web-application#putting-it-all-together
09:56	entity	how do you make a copy of a string?
09:56	entity	does str make a copy?
09:58	socksy	strings are immutable
09:58	patrickgombert	entity: strings are immutable so it wouldn't necesarrily matter if it made a copy or not
09:59	socksy	(they are just java strings)
09:59	entity	ah, I dodn't know they were immutable, assumed they're mutable since they're java strings
10:00	socksy	java strings are immutable :)
10:00	entity	java.lang.String is immutable?
10:00	socksy	yes
10:01	entity	ah, all the methods return new copies
10:01	entity	right, thanks
10:01	wasamasa	they are in all the sane languages
10:01	socksy	wasamasa: that's not fair, you could say that about nearly every data structure ;)
10:01	wasamasa	ruby and C and elisp are therefore out :>
10:03	wasamasa	socksy: my point is that strings being mutable is the exception
10:03	entity	so suppose I wanted to kinda merge two strings together, taking a random character from each string... so (merge "abcd" "xyzw") could return "xbzw"
10:03	entity	is there a fast way to do this, not making a new string object at each character?
10:05	entity	or would it be more efficient to have the strings represented as lists/vectors of character in this case
10:08	socksy	I'd do vectors of chars personally
10:09	entity	looks like it will be easier to do that
10:09	socksy	actually, I wouldn't care about performance at all until it was slow enough to warrant rewriting it, so I'd probably do any old collection with single char strings
10:10	socksy	once you have the map logic hashed out, then look into optimisations, perhaps
10:10	wasamasa	hum, in clojure (seq "foobar") gives you (\f \o \o \b \a \r), but in clojurescript it's ("f" "o" "o" "b" "a" "r")
10:10	entity	socksy: thanks for the tips, I'll go with vectors for now
10:14	mgaare_	anyone have any luck getting clojure.tools.namespace.repl and cljx to play nice?
10:16	patrickgombert	wasamasa: https://github.com/clojure/clojurescript/wiki/Differences-from-Clojure#the-reader
10:16	patrickgombert	there are no character literals in javascript
10:19	wasamasa	it totally makes sense, I've just learned that using seq on a string gives me something else than substrings and was surprised about clojurescript behaving differently
10:20	CookedGryphon	Hi, I'm loading a runtime dependency with pomegranate. How can I call a contained static method?
10:20	CookedGryphon	if it was a clojure function, I'd use resolve and the quoted form
10:21	CookedGryphon	but I get a NPE doing that with a static java method
10:31	mrb_bk	Anyone got recommendations for simple signal handling?
10:32	mrb_bk	Need to handle TERM and INT with a ring server
10:32	gfredericks	mrb_bk: like handling unix signals from the jvm?
10:33	mrb_bk	gfredericks: Oh hi! Yes
10:33	gfredericks	I have some stuff somewhere that casually did this
10:33	mrb_bk	gfredericks: dope, casual is fine
10:33	gfredericks	please coat this code in disclaimers
10:34	gfredericks	https://github.com/clojure/test.check/blob/gfredericks/prng-comparison/src/dev/clojure/clojure/test/check/prng_comparison.clj#L6-12
10:35	mrb_bk	sun.misc
10:35	mrb_bk	Is so dope
10:35	mrb_bk	gfredericks: thanks
10:35	gfredericks	mrb_bk: np
10:35	mrb_bk	https://github.com/hyPiRion/beckon looks somewhat reasonable
10:38	gfredericks	yeah I bet so
10:43	entity	I'm trying to use fireplace with vim... I can see fireplace in :scriptnames, but commands like :Connect or :cpp fail, saying they're not an editor command
10:44	entity	although things like 'K' seem to work
10:45	entity	weird, maybe I jsut can't use it :P
10:45	entity	oh, it's not :cpp it's cpp
10:45	kaiyin	hi, ambrosebs. i am back.
10:45	entity	nevermind then
10:45	kaiyin	So what's the better version of that error msg?
11:13	entity	how can I dynamically create a vector of length n?
11:14	entity	the docs for assoc are confusing
11:14	Bronsa	entity: start with an empty vector and just keep adding elements to it
11:14	entity	Bronsa: using assoc?
11:14	Bronsa	,(conj [] 1)
11:14	clojurebot	[1]
11:14	entity	ah, thanks
11:15	kaiyin	ambrosebs: I have created a bug report on jira.
11:16	justin_smith	entity: if you know the exact size vector (or the contents) ahead of time, there is vec
11:16	justin_smith	,(vec (repeat 10 nil))
11:16	clojurebot	[nil nil nil nil nil ...]
11:17	Bronsa	justin_smith: it makes little sense to create an "empty" vector of size n in clojure, imho
11:17	Bronsa	justin_smith: usually that's something you need to do in langs with mutable colls/explicit memory allocation
11:18	entity	awesome, I can replace 'nil' with a function, I assume?
11:18	Bronsa	entity: using repeatedly rather then repeat, yes
11:18	entity	ah okay, cool
11:19	Bronsa	,(repeatedly 10 (constantly 3))
11:19	clojurebot	(3 3 3 3 3 ...)
11:35	wombawomba	So running `lein deps` doesn't seem to download all my dependencies; when I run `lein ring server`, a bunch of extra dependencies are downloaded. Is there any way to get around this?
11:35	justin_smith	wombawomba: by using lein ring you alter your deps
11:36	wombawomba	justin_smith: any way I can make that alteration ahead of time?
11:36	justin_smith	Bronsa: it looks like creating a vector all in one go has perf benefits compared to conj https://www.refheap.com/101346
11:37	justin_smith	wombawomba: not that I know of. I hope this isn't a concern because you want to use lein ring in production. Don't do that.
11:37	justin_smith	Bronsa: whether those are worth it is an open question, and probably depends on context too...
11:38	wombawomba	I'm trying to build a docker container that has my app in it, and that runs `lein ring server-headless`
11:38	justin_smith	wombawomba: make an uberjar instead, and run the uberjar with java
11:38	wombawomba	...but running lein ring means it takes forever
11:38	Bronsa	justin_smith: it sure does, my point is that I don't think it's something one should need to do in clojure
11:39	justin_smith	Bronsa: OK.
11:39	sobel	+1 uberjar
11:39	sobel	works well.
11:39	wombawomba	justin_smith: I could do that, but I'm doing this for development
11:39	justin_smith	wombawomba: with an uberjar, your docker no longer needs to contain git, or lein
11:39	justin_smith	wombawomba: oh
11:39	wombawomba	so I don't want to have to rebuild my container every time I change the code
11:39	sobel	i generally can't hear any meaning in the phrase, "but this is for development"
11:39	sobel	code is code
11:40	justin_smith	sobel: point being that he wants eg. the reloading behavior you get with lein ring, and to edit his code while the server runs.
11:40	justin_smith	inside a docker container
11:40	wombawomba	right
11:41	sobel	oh so the whole container is a dev instance
11:41	wombawomba	exactly
11:41	justin_smith	wombawomba: part of what lein-ring does is that it adds deps to be resolved. I'm not sure if there is a simple way to add those deps manually.
11:42	justin_smith	wombawomba: weavejester might be able to tell you if there's a trick for that, if he was around.
11:42	wombawomba	hmm
11:42	arohner	wombawomba: you can probably make it happen using 'lein with-profile
11:43	wombawomba	I guess I could try to find another way to get the autoreloading running
11:43	justin_smith	there is the wrap-reload middleware
11:43	arohner	wombawomba: ah, no, lein ring just adds a dep on '[ring-server/ring-server "0.4.0']. If you add that to your deps, it will probably be downloaded
11:43	justin_smith	that plus some embedded ring server (jetty, aleph, http-kit)? should get you what you want
11:44	justin_smith	arohner: oh, it's that easy? nice.
11:44	arohner	+1 for reading the source :-)
11:44	justin_smith	(inc arohner)
11:44	lazybot	⇒ 1
11:44	entity	can someone please take a look at this code? I can't fihure out what's going on http://pastie.org/10198865#9
11:44	wombawomba	arohner: neat :)
11:45	justin_smith	entity: defn needs a parameter vector
11:45	justin_smith	entity: so change it to (defn rand-dna [] ...
11:45	entity	ahh
11:45	entity	thanks
11:45	justin_smith	also, that fn rand-gene is a no-op
11:45	justin_smith	it doesn't get called or returned
11:46	justin_smith	so it is effectively not there
11:46	entity	it is called on the line below
11:46	justin_smith	no, it isn't
11:46	justin_smith	because there is no binding :)
11:46	justin_smith	it doesn't exist as far as the next line is concerned
11:46	justin_smith	you need to use let or letfn
11:47	entity	oh, I see
11:47	entity	thanks again :)
12:23	andyf_	cfleming: Bronsa: I was reminded of Eastwood's WARNING in its documentation about how it will 'launch the missiles' if require or use on your namespaces would also do that. I am guessing that whatever static analysis Cursive does would not launch the missiles on similar source files? Sounds tricky to get good knowledge of what symbols mean without full eval.
12:25	andyf_	Lots of common cases could be handled without full eval, of course, so perhaps Cursive just handles the common cases?
12:29	kaiyin	why does this block indefinitely after msg1?
12:30	gfredericks	kaiyin is blocking after the first message and so cannot send the second message with the actual code in it
12:31	kaiyin	sorry, copy/paste stopped working suddenly. https://gist.github.com/kindlychung/3f7c7a82f9dcecc4eb18 why does this hangs indefinitely on msg1?
12:34	kaiyin	ah, i think timeout is misused here.
12:35	kaiyin	how can I make it sleep for some time in a go block?
12:37	gfredericks	I think that would be a misuse of go blocks
12:38	gfredericks	you probably want to read a message from the timeout channel
12:38	gfredericks	but I'm not the bestest with core.async so dunno
12:42	kaiyin	ok
12:52	edbond	how to access environment by environ.core/env in project.clj? I want to pass database-url to ragtime in project.clj
12:53	edbond	environ page says I need to add lein-environ to :plugins. What's next?
12:54	edbond	https://www.refheap.com/101349
12:58	justin_smith	you add an :env key (usually under some profile), or alternatively set an environment variable in the shell so that lein will see it
12:58	justin_smith	typical is :env key for dev config, shell environment for prod
12:59	justin_smith	edbond: see the second block of source code here https://github.com/weavejester/environ#example-usage
13:00	justin_smith	that hash-map would go under :profiles
13:00	edbond	justin_smith, yes, I created profiles.clj
13:00	justin_smith	OK, then you are done
13:00	edbond	question is how to access it in :ragtime { :database <here> }
13:00	justin_smith	(env :ragtime)
13:01	justin_smith	in your source
13:01	edbond	that's not my source, it's project.clj, see https://www.refheap.com/101349 part of project.clj
13:02	justin_smith	right. That sets the data. In your source you use env to access it.
13:02	justin_smith	but :ragtime has to be under the :env key
13:02	justin_smith	like in the example I pointed out
13:03	edbond	I need to access environ.core/env in project.clj, in :plugins
13:04	edbond	hm, wait
13:05	edbond	profiles.clj will be merged in project.clj without subkey?
13:05	justin_smith	oh, I misunderstood, sorry
13:05	edbond	I mean as is?
13:06	edbond	or under :profiles key in project.clj?
13:06	justin_smith	I'd say for a tool like ragtime, it makes more sense to just have profile-specific configs, rather than using indirection via env
13:08	faveteli1guis	what am i missing here, any ideas? https://gist.github.com/favetelinguis/de0071d7b237a600f310
13:13	edbond	faveteli1guis, #(0 > 1) => #(> 0 1)
13:13	edbond	,(> 0 1)
13:13	clojurebot	false
13:13	edbond	,(0 > 1)
13:13	clojurebot	#error {\n :cause "java.lang.Long cannot be cast to clojure.lang.IFn"\n :via\n [{:type java.lang.ClassCastException\n :message "java.lang.Long cannot be cast to clojure.lang.IFn"\n :at [sandbox$eval49 invoke "NO_SOURCE_FILE" 0]}]\n :trace\n [[sandbox$eval49 invoke "NO_SOURCE_FILE" 0]\n [clojure.lang.Compiler eval "Compiler.java" 6792]\n [clojure.lang.Compiler eval "Compiler.java" 6755]\n [c...
13:14	edbond	justin_smith, yes, I still don't get how to access env in project.clj using :plugins [lein-environ]
13:15	justin_smith	edbond: doing that makes no sense to me, sorry
13:15	edbond	or I don't understand correct "If you want to be able to draw settings from the Leiningen project map, you'll also need the following plugin"
13:16	edbond	hm, how the to make project.clj environment aware? (if dev [criterium "x.x"]) for example
13:17	justin_smith	well this is what profiles are supposed to be for, and I really don't see what environ does that would improv it in any way
13:17	justin_smith	but maybe I'm missing something here
13:22	edbond	justin_smith, found in internets this thing: ~(System/getenv "artifactory_username")
13:23	justin_smith	that would get it out of the environment as set by the shell
13:23	justin_smith	I don't see how this would help during development, and in production you shouldn't be using project.clj at all
13:24	edbond	why not? I need to run migrations using ragtime - lein ragtime migrate in production.
13:24	edbond	For this I will need another database-url, most likely set in env
13:32	edbond	For this I will need another database-url, most likely set in env
13:47	kaiyin	could anyone help with this?
13:47	kaiyin	http://stackoverflow.com/questions/30356859/upper-limit-for-number-of-jobs-in-a-do-block
13:49	noncom	kaiyin: puts and jobs are different
13:49	noncom	puts are queued on the channel
13:49	noncom	(afaik)
13:50	kaiyin	ok, i see.
13:51	noncom	kaiyin: or, better, 1 channel allows for no more tahn 1024 putting/taking jobs
13:51	noncom	you may increase the size or use the buffering window
13:52	noncom	also, you may have more channels and more go-blocks
13:52	noncom	the keyword is that 1024 is max on a single channel
13:55	kaiyin	noncom: how do you use a buffering window?
13:56	noncom	kaiyin: http://clojure.github.io/core.async/ look at sliding-buffer and dropping-buffer
13:58	noncom	kaiyin: you can also pass a number of max buffer elements to a channel or buffer when creating them]
14:00	kaiyin	ok
14:03	harrigan	is there any way to stop seque from holding onto the head of a seq?
14:03	harrigan	e.g. so that (let [r (seque (range 1e8))] [(first r) (last r)]) will not run out of memory
14:06	cfleming	noncom: Did you receive my email? Did it help?
14:31	harrigan	sorry, it's not holding onto head -- some other issue -- (last (seque (range 1e8))) also runs out of memory
14:38	andyf	cfleming: Does Cursive ever eval Clojure source code for the purposes of analyzing it (I don't mean in a REPL)
14:41	sritchie	anyone used a project with lein-modules on dokku or heroku?
14:41	sdegutis	Look. You have a function create-widget which takes [state, number] and returns [state, widget], alright? And you have a seq of numbers, so you want to create a seq of widgets. Normally you could use map, right? But look, you need to thread the returned state from one call into the next call.
14:41	sritchie	***ing the bed in a big way: java.io.IOException: Cannot run program "lein" (in directory "/tmp/build/queue"): error=2, No such file or directory
14:42	sdegutis	Na'm sa'n?
14:42	sdegutis	So I thought to myself, surely this sounds like a job for some kind of monad. But I don't know Haskell, and this is Clojure.
14:42	sdegutis	So how do you solve this?
14:44	btobolaski	Use the threading macro inside the map?
14:45	sdegutis	Sorry I don't mean threaded like -> or ->>
14:46	sdegutis	I mean, the state returned from one call to create-widget needs to be passed into the next call of create-widget as the first parameter.
14:48	andyf	sdegutis: reduce ?
14:48	sdegutis	Hmm yeah maybe that will work. Seems like a weird way to map, but if it gets the job done...
14:48	andyf	There's always loop, if you have to, or just prefer the way the code looks
14:49	Bronsa	andyf: I think cursive only does static analysis -- no eval
14:50	andyf	Bronsa: Makes sense, if so. Sounds like a lot of work to write, with weird corner cases it won't quite do, unless I'm missing something.
14:50	infinity777	Disco Melee is hiring clojure developers. We are a fun team that is growing rapidly. Help us shape the future of gaming! https://docs.google.com/document/d/1GvnrSCUbYgbY9XdFs_DUx-0QZG2bIYT8Mbr0zdpTeew/edit?usp=sharing
14:51	andyf	I think it is the right way to go for a commercial tool. Not criticizing, just thinking about the approach and what it can do.
14:51	Bronsa	andyf: lot of work for sure. I believe it also requires custom rules for macros in order to do correct symbol resolution
14:54	Bronsa	andyf: I only partially agree -- no eval is definitely better than eval for an IDE but since it's so common to have live repls, runtime code might be available anyway. could have the best of both worlds combining static analysis with slime-like runtime introspection
14:55	Bronsa	but I understand cfleming is just one guy and it'd be probably impossible time-wise to do both :P
14:55	andyf	I'm just idly imagining what a Clojure lint tool would have to look like in order to avoid 'launching the missiles'
14:56	andyf	I suppose an approach like clojail might help protect you.
14:56	lvh	Doesn't kibit do a lot of that?
14:56	lvh	(It does it by parsing the code and doing pattern matching on the sexps; no evaling)
14:57	Bronsa	andyf: while worth it for a code editor, I don't think it'd be worth for a linter. would require too much config for the user
14:57	andyf	Yes, but kibitz doesn't catch the kinds of potential mistakes that Eastwood does (which evals)
14:57	andyf	s/kibitz/kibit/
14:57	lvh	sure
14:57	Bronsa	kibit is significantly less powerful than eastwood
14:57	lvh	it seems like there's an opportunity for limited evaluation for stuff like "is this actually a fn"
14:57	lvh	I don't know if that means "clojail" or "implement a handful of behaviors separately"
14:58	sdegutis	Figured it out.
14:58	sdegutis	I shouldn't have side-effect-ish functions like this that take and return state.
14:58	sdegutis	Instead I should be building up descriptions of side effects to run, and then committing them all at once.
14:58	sdegutis	Because working with data is way easier than working with state.
14:59	andyf	Preach it, sdegutis.
14:59	andyf	(I mean that in an encouraging, not sarcastic, way)
14:59	sdegutis	Plus I'll be able to add another badge to my nerd sash.
14:59	mlb-	Not trolling, but is there a guide for Java design patterns for Clojure programmers?
15:00	sobel	mlb-: i can explain why that's not 1:1
15:01	mlb-	sobel: I'm not expecting a complete 1:1 mapping of Clojure idioms to Java GoF design patterns ;]
15:02	andyf	mlb-: Do you mean a book on design patterns in Java, targeted at someone who knows Clojure already, but not Java?
15:02	sobel	are you looking for a getting-started group?
15:02	allenj12	this might be a litttle too big of an example but is it possible to make this use a transducer instead of reduce? http://pastebin.com/5tgRccPN
15:03	mlb-	andyf: If such a thing existed, I'd be very interested.
15:04	andyf	Some Lisp developer, maybe Paul Graham, wrote a summary of some OO design patterns, and how many of them were unnecessary in Common Lisp
15:04	mlb-	sobel: "Getting-started group"? I think so?
15:04	sobel	mlb-: are you starting clojure?
15:05	mlb-	andyf: Ah, no. Other way about. I got my team hooked on Clojure, but $WORK has mandated future development should be in Java
15:05	andyf	There may be a link to that article on this page: http://c2.com/cgi/wiki?AreDesignPatternsMissingLanguageFeatures
15:05	atankanow	mlb-: you may want to look up some of Venkat Subramaniam's java books or if you just want Java best practices read Effective Java
15:05	sobel	i can point you at some items to look at if you are trying to solve a specific case, otherwise... start doing stuff, ask specific questions. you will be amazed how fast just using clojure will cause you to need answers to specific questions :)
15:06	sobel	oh, bummer
15:06	andyf	Reading that page will be demotivating to anyone tasked with switching from Clojure to Java, I think :)
15:08	cfleming	andyf Bronsa: That's right, Cursive only does static analysis of the source
15:08	atankanow	mlb-: Venkat has a nice Functional Pogramming in java book ... it's better than starting with lots of value objects as I learned when i started
15:08	mlb-	andyf: I was demotivated when I heard the underlying motivation to move from Clojure to Jave :(
15:09	cfleming	andyf Bronsa: It is indeed very tricky and it does also require custom rules for macros (currently only provided by me, but that will change)
15:10	mlb-	atankanow: Ah, thanks. I found it on Amazon
15:10	atankanow	mlb-: yw
15:10	atankanow	mlb-: what was the motivation to move to java?
15:12	mlb-	atankanow: Concerns over finding qualified candidates and assumptions of salary making them costly to retain.
15:12	cfleming	andyf Bronsa: The main limitation is the macro issue - once that's dealt with, it allows some very powerful functionality. For example, I'm currently doing type inference for Java interop, so completion etc will (hopefully) work as well as Java
15:12	andyf	cfleming: Thanks for the info. I am happy to be amazed at your achievements, without reimplementing them :)
15:13	cfleming	andyf: Hehe - it's definitely been more work than I expected!
15:15	atankanow	mlb-: ah ... well ... there are lots of expensive bad java devs out there too =)
15:16	andyf	mlb-: Might not be possible to convince your management otherwise, but I noticed that Alex Miller at Clojure/West had everyone in the room hiring Clojure developers raise their hands, and then put them down. Then everyone looking for work writing Clojure raise their hands. He commented that they should all be talking to each other :)
15:17	mlb-	Haha, true. Sadly, I've uncovered there's more cargo-culting here than observation of facts :(
15:18	atankanow	mlb-: i write java at work ... it's not a bad language ... like anything it can be corrupted
15:18	sobel	i really like my niche here, where i write extensions to a mostly-java code base in Clojure and call into them as needed.
15:18	sobel	library sized extensions
15:19	mlb-	atankanow: I fear that only works when your coworkers also have enough discipline to not do things the sloppy way
15:20	atankanow	nice ... that is cool ... I asked Neal Ford of thoughtworks once how I can get clojure into my java-based work projects, his response was to simply use AOT compilation and put the jars out ... no one will be the wiser
15:20	TEttinger	also never throw an exception
15:20	mlb-	my current escape hatch is to extend the existing Clojure stuff and let "new" projects be Java ;]
15:22	sritchie	gah, why am I still seeing this WARNING: please set :license in project.clj.
15:22	sritchie	err
15:22	sritchie	No credentials found for clojars
15:22	sritchie	I know they’re in credentials.clj;
15:23	sritchie	under #”https://clojars.org/repo"
15:23	sritchie	is there something else I need to do to alias the entry as “clojars” or something?
15:28	allenj12	sorry for the repeat, but does anyone have experience with transducers? http://pastebin.com/5tgRccPN
15:29	atankanow	given a map where the vals are vectors, what is the idiomatic way to sort every val in the map?
15:29	atankanow	this is what i have:
15:29	sritchie	anyone using credentials.clj?
15:29	atankanow	,(map (fn [[k v]] [k (sort v)]) {:a [4 3 2 1]})
15:29	clojurebot	([:a (1 2 3 4)])
15:29	atankanow	,(map (fn [[k v]] [k (sort v)]) {:a [4 3 2 1] :b [\d \c \b \a})
15:29	clojurebot	#<RuntimeException java.lang.RuntimeException: Unmatched delimiter: }>
15:30	atankanow	,(map (fn [[k v]] [k (sort v)]) {:a [4 3 2 1] :b [\d \c \b \a]})
15:30	clojurebot	([:a (1 2 3 4)] [:b (\a \b \c \d)])
15:31	allenj12	atankanow: that looks good, you could use (into [] .. ) if you want the vector back
15:31	atankanow	right ... the point was actually to sort the map by keys and vals, so i just put the output of that map (into (sorted-map) ...)
15:32	tcrawley	sritchie: I use a ~/.lein/credentials.clj.gpg, with: {#"https://clojars.org/.*" {:username "foo" :password "barbell"}}
15:33	tcrawley	and that works for me
15:33	sritchie	tcrawley: looks like I had two maps in that file by accident. whoops
15:33	sritchie	fixed my big issue on OS X by installing GPGTools
15:33	tcrawley	gpg is the bestest
15:34	tcrawley	glad you figured it out though
15:35	TimMc	mlb-: Just tell them you'll switch to writing Java but occasionally pull in Clojure "just as a library". ;-)
15:35	allenj12	atankanow: If your using the clojure beta you can use transducers
15:35	allenj12	(into {} (map (fn [[k v]] [k (sort v)])) {:a [4 3 2 1]})
15:35	TEttinger	atankanow:
15:35	allenj12	,(into {} (map (fn [[k v]] [k (sort v)])) {:a [4 3 2 1]})
15:35	TEttinger	(doc sorted-map-by)
15:35	clojurebot	"([comparator & keyvals]); keyval => key val Returns a new sorted map with supplied mappings, using the supplied comparator. If any keys are equal, they are handled as if by repeated uses of assoc."
15:35	clojurebot	{:a (1 2 3 4)}
15:37	TEttinger	atankanow, what kind of input to what kind of output do you want?
15:38	sritchie	tcrawley: thanks!
15:38	atankanow	TEttinger: {:a [4 3 2 1} -> {:a [1 2 3 4]} ... yes ... i could rigth a k/v comparator and used sorted-map-by
15:38	atankanow	write
15:40	allenj12	atankanow: so you want it to be sorted by key aswell?
15:44	TEttinger	,(into (sorted-map-by (fn [[k1 v1][k2 v2]] (compare v1 v2)) (map (fn [[k v]] [k (sort v)]) {:a [4 3 2 1] :b [\d \c \a \b]} ))
15:44	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
15:45	TEttinger	,(into (sorted-map-by (fn [[k1 v1][k2 v2]] (compare v1 v2))) (map (fn [[k v]] [k (sort v)]) {:a [4 3 2 1] :b [\d \c \a \b]} ))
15:45	clojurebot	#error {\n :cause "nth not supported on this type: Keyword"\n :via\n [{:type java.lang.UnsupportedOperationException\n :message "nth not supported on this type: Keyword"\n :at [clojure.lang.RT nthFrom "RT.java" 933]}]\n :trace\n [[clojure.lang.RT nthFrom "RT.java" 933]\n [clojure.lang.RT nth "RT.java" 883]\n [sandbox$eval47$fn__50 invoke "NO_SOURCE_FILE" 0]\n [clojure.lang.AFunction compare...
15:45	TEttinger	aww
15:47	crack_user	why I should put a '@' in front the keyword when it refers a atom?
15:47	TEttinger	crack_user: @ dereferences it, it gets the current value
15:48	TEttinger	otherwise you are passing the wrapping atom, which can later change, not its current value
15:48	crack_user	TEttinger: so atom store others values beyond the current?
15:48	tcrawley	sritchie: my pleasure!
15:49	fourq	What kind of lists do lines 2 and 3 evaluate to? (They just look like floating keywords) https://gist.github.com/anonymous/6f3059ea59a5713f08e5#file-clj-L2-L3
15:50	puredanger	repl is a macro that takes options as alternating key/value pairs
15:50	puredanger	I guess I don't know if it's a macro, prob a fn actually
15:50	TEttinger	,(let [adam (atom [])] (do (print adam) (print @adam) (swap! adam conj :eve) (print adam) (print @adam)))
15:50	clojurebot	#object[clojure.lang.Atom 0x2facf711 {:status :ready, :val []}][]#object[clojure.lang.Atom 0x2facf711 {:status :ready, :val [:eve]}][:eve]
15:51	TEttinger	crack_user, just printing adam isn't very useful, as you can probably tell :)
15:51	atankanow	as an Adam, I appreciate that reference ... and dereference ... thanks TEttinger!
15:51	TEttinger	heh
15:52	fourq	puredanger ty
15:59	crack_user	TEttinger: thx, I get it
16:20	Reefersleep	Hey peeps
16:20	Reefersleep	Anyone use Vim for Clojure development?
16:21	Reefersleep	I'd like to pick your brain about vim-fireplace and indentation via =G
16:21	Reefersleep	or = anything
16:25	oddcully	Reefersleep: i do and = usually leaves my brain alone
16:27	Reefersleep	Cool oddcully
16:27	Reefersleep	So you never experience anything weird when using = to indent?
16:28	kaiyin	Here is the hotdog machine example from Clojure for the brave and true: https://gist.github.com/kindlychung/36ffd585378c69b4895c
16:29	kaiyin	Using one channel seems quite enough, what's the advantage of using two channels?
16:29	Reefersleep	I've experience a weird, unnecessary deep level of indentation after a line containing \[, that is, the character "["
16:29	Reefersleep	I think the indenting mechanism interprets it as the beginning of a vector
16:29	Reefersleep	or something like that
16:30	oddcully	Reefersleep: let me try that...
16:31	Reefersleep	Cheers :)
16:32	oddcully	cheers in deed. need a beer. well could you provide some snippet via pastebin/gist/refheap/... ? my naïve attempt don't break (e.g. (str "asdf" \[ "adsf"))
16:33	Reefersleep	lemme whip something up
16:41	Reefersleep	here you go oddcully
16:41	Reefersleep	http://pastebin.com/dCN5iHwx
16:41	Reefersleep	That's as it appears when I do gg =G
16:42	Reefersleep	I've got stuff in my .vimrc of course
16:42	Reefersleep	let me just try with an empty .vimrc
16:44	oddcully	i pasted this, paredit added the ] and after cleaning out some whitespace the internet gods gave me, this indents quite correct for me
16:44	oddcully	the (+ is under (prn
16:48	Reefersleep	here's with an empty .vimrc
16:48	Reefersleep	it actually looks fine. Well, not wrong, anyway.
16:48	Reefersleep	http://pastebin.com/6t7Bxvik
16:49	sorbo_	I'm trying to "roll up" a vector of maps into a map of maps. Anyone done something like this? Gist here: https://gist.github.com/anonymous/05428c95465d590400be
16:50	sorbo_	vector of maps -> map of maps makes sense to me, but I'm not sure how to "update" fields as I zip
16:51	Reefersleep	I guess I gotta find the culprit in my .vimrc
16:51	Reefersleep	I don't use paredit
16:51	Reefersleep	for some reason, the Leader key does not work in my current Vim
16:52	oddcully	paredit most likely does not fix indenting
16:52	Reefersleep	and without it paredit doesn't work the way it's supposed to
16:52	Reefersleep	Well, just to say that I don't use it :)
16:54	oddcully	i am the first to turn of stupid "autocomplete" stuff in any program... but paredit + i/a motions is really handy
16:54	gfredericks	sorbo_: you just have the id key and the one other key?
16:54	sorbo_	gfredericks: there are other keys, but those don't need to accumulate. they're the same from map to map.
16:55	gfredericks	sorbo_: okay so those would not be included in the return value?
16:56	gfredericks	sorbo_: I think this does what you want https://github.com/Prismatic/plumbing/blob/master/src/plumbing/core.cljx#L160-169
16:56	Reefersleep	hm, it was not "set filetype indent on"
16:56	sdegutis	Is there an idiomatic Clojure pattern for this that doesn't use a custom function?
16:57	sdegutis	I have a list of maps, and I want to get the first one (if any) with a key matching a given value.
16:57	Reefersleep	oddcully, I'm sure it's neat (paredit), and I'd love to give it a go - I think I need to recompile Vim or something to fix the Leader key first, though
16:57	sorbo_	gfredericks: this looks promising, I'll give it a go
16:57	sorbo_	thanks!
16:57	sdegutis	Only way I know how to do it is with (first (filter #(= value (:key %))))
16:58	sdegutis	Hi I'm new to Clojure, please help?
16:58	oddcully	Reefersleep: maybe you have just configured it wrong? my leader is the default \ iirc. i have several commands on , as pseudo leader
16:58	justin_smith	sdegutis: lol
16:58	oddcully	Reefersleep: at least things like \sh for slamhound work
16:59	sdegutis	I mean new to writing good Clojure.
16:59	sdegutis	Sorry for ambiguity.
16:59	oddcully	Reefersleep: but paredit (for me) needs no leader at all. it just works its magic with (){}[]""
16:59	gfredericks	sdegutis: I think that's how most people do it
16:59	sdegutis	gfredericks: there must be a better way
17:00	sdegutis	I thought I found one the other day, but I can't remember it.
17:00	sdegutis	I think it used juxt and set.
17:01	gfredericks	there's certainly weirder ways to do it
17:01	sdegutis	Sorry no I am looking for idiotic way.
17:01	sdegutis	idiomatic
17:01	justin_smith	(first (filter (comp #{:v} :field) [{:field :a} {:field :b} {:field :v}])) ; something like this?
17:01	justin_smith	,(first (filter (comp #{:v} :field) [{:field :a} {:field :b} {:field :v}]))
17:01	clojurebot	{:field :v}
17:02	sdegutis	Looks right.
17:02	sdegutis	How the..
17:02	justin_smith	it's classier I guess, but not neccessarily better
17:02	sdegutis	Why not better?
17:02	gfredericks	readability
17:02	sdegutis	I'm trying to idiomatic my Closure code.
17:02	justin_smith	a simple equality check is more directly what you want, and more efficient than the set lookup I would assume
17:02	sdegutis	I want repeatability over readability.
17:03	sdegutis	And generalizationiability.
17:03	sdegutis	This is more general solution which works for more than just maps and attributes.
17:03	sdegutis	For example, the function I want to compare right now involves comp, not just a key test.
17:03	sdegutis	Ima comp a datomic entity attribute to another lazy datomic entity relationship and get that guys attribute key.
17:04	justin_smith	I think the main thing it has going for it is it makes the reader thing "gee whiz, I bet the person who wrote that is a functional programmer"
17:04	sdegutis	I always thought it was better form to write more general and functional code and fewer anonymous functions.
17:04	sdegutis	Since anonymous functions encourage repeating the same algorithm everywhere instead of giving it a name.
17:05	justin_smith	I'm being a bit glib there
17:05	sdegutis	Even after reading the definition of glib I don't know what you mean sorry.
17:05	gfredericks	you could argue that readability is a lot more important than maximizing generality
17:05	Reefersleep	Whatever I comment out, stuff is not right
17:05	Reefersleep	I can get rid of the \[ problem, but then other stuff happens
17:06	sdegutis	(def get-first [things finder value] (first (filter (comp #{value} finder) things)))
17:06	sdegutis	gfredericks: they're equally important
17:06	sdegutis	gfredericks: they both have a precedence of 120
17:06	gfredericks	okay
17:06	gfredericks	good to know
17:06	sdegutis	(if you compile with default flags)
17:06	justin_smith	sdegutis: if the person is looking for false or nil, that will fail
17:07	sdegutis	justin_smith: ugh dangit
17:07	sdegutis	then maybe just =
17:07	sdegutis	(partial = value)
17:07	justin_smith	I would use (partial = value) yeah
17:07	sdegutis	Great.
17:07	sdegutis	Still feels better than #(= value %)
17:07	justin_smith	if you had values (partial contains? (set values))
17:07	sdegutis	I'm sure it is better, even though I can't fully explain why.
17:08	justin_smith	,((partial (contains? (set [:a :b :c]))) :a)
17:08	clojurebot	#error {\n :cause "Wrong number of args (1) passed to: core/contains?"\n :via\n [{:type clojure.lang.ArityException\n :message "Wrong number of args (1) passed to: core/contains?"\n :at [clojure.lang.AFn throwArity "AFn.java" 429]}]\n :trace\n [[clojure.lang.AFn throwArity "AFn.java" 429]\n [clojure.lang.AFn invoke "AFn.java" 32]\n [sandbox$eval49 invoke "NO_SOURCE_FILE" 0]\n [clojure.lang....
17:08	justin_smith	ergh
17:08	justin_smith	,((partial contains? (set [nil :a :b :c])) nil)
17:08	clojurebot	true
17:09	sdegutis	justin_smith: thanks for helping me with this i appreciate the patience
17:09	sdegutis	and gfredericks thank you for your persistence in helping finding a good solution
17:09	gfredericks	np
17:10	sdegutis	attribute is too specific to objects, whats a better word for a function that can be operated on a value to turn it into another value somehow
17:10	sdegutis	maybe function?
17:10	sdegutis	like "its a function of this thing"
17:11	gfredericks	key-fn is used a lot in clojure.core
17:11	gfredericks	,(doc min-by)
17:11	clojurebot	Excuse me?
17:12	gfredericks	&(doc min-by)
17:12	lazybot	java.lang.RuntimeException: Unable to resolve var: min-by in this context
17:12	gfredericks	&(doc min-key)
17:12	lazybot	⇒ "([k x] [k x y] [k x y & more]); Returns the x for which (k x), a number, is least."
17:12	sdegutis	but it mightnt be a key, it might be any arbitrary derivation
17:12	sdegutis	derivation-fn seems more apt
17:12	sdegutis	amirite
17:12	Reefersleep	oddcully: some stuff worked in paredit without the leader key
17:12	gfredericks	sdegutis: the min-key and max-key functions use "key" in a more abstract way
17:12	gfredericks	that is similar to yours
17:12	sdegutis	oh
17:12	sdegutis	ok maybe keyfn
17:12	sdegutis	why the dash tho?
17:12	sdegutis	keyfn isnt ambiguous
17:13	gfredericks	somepeoplelikedashes
17:13	Reefersleep	oddcully: it was kind of weird, though. According to the documentation, stuff that was supposed to be preceded with the leader key just worked without
17:13	sdegutis	keyfn is short enough to not be difficult to visually parse
17:13	gfredericks	okay
17:13	sdegutis	so-mepe-ople-liked-ashes btw fwiw
17:13	Reefersleep	oddcully: and this caused a problem whenever I passed over function names from clojure core (I think), because it would try to look up the documentation (I think)
17:14	Reefersleep	oddcully: which caused lag. Which, you can guess, was immensely annoying. Imagine lag for every third w
17:14	Reefersleep	horrible.
17:15	oddcully	Reefersleep: brain fade... i actually use the leader there all the time for \W, \w{ and \s etc
17:16	Reefersleep	oddcully: Anyhow, I looked through my .vimrc with /indent and commented out any line I found, one by one, and tried to indent afterwards with each individual change.
17:16	oddcully	Reefersleep: but i feel the pain. i have configured plugins to my needs because they used some odd leader which cramped my style
17:16	sdegutis	It workd be.
17:16	sdegutis	btw
17:16	Reefersleep	oddcully: And I could not get sane indentation with any of the individual options left out.
17:17	Reefersleep	oddcully: I've read that this is a common problem with Vim :(
17:17	oddcully	not with my vim it aint ^_^
17:17	Reefersleep	oddcully: Good for you :)
17:18	oddcully	Reefersleep: i run std gentoo vim 7.4.273
17:18	Reefersleep	oddcully: I'll figure the leader out eventually, and I'm looking forward to parediting :)
17:18	Reefersleep	oddcully: how do you get the version?
17:18	oddcully	run vim - it's in the middle of the screen
17:18	Reefersleep	VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Apr 22 2014 11:08:18) MacOS X (unix) version Included patches: 1-258 Compiled by buildbot@tenseven-slave.macports.org Huge version without GUI. Features included (+) or not (-):
17:19	Reefersleep	(from :version)
17:19	oddcully	there for sure is some --version too
17:19	Reefersleep	Hm. I thought it would be compiled by me. Maybe I've accidentally removed a symlink or something
17:20	oddcully	maybe relevant plugins are: paredit, fireplace, typedclojure, slamhound, eastwood, surround, matchit
17:20	oddcully	rather excessive list for a try-and-error-run :/
17:20	Reefersleep	Of those, I only have fireplace
17:20	Reefersleep	I could try commenting out pathogen infect
17:22	Reefersleep	No difference without vim-fireplace
17:22	oddcully	i have used all my vim foo for today. i have no clue, where i would start to look for such an indenting problem
17:22	Reefersleep	Well, thanks for spending it on me, oddcully :)
17:22	oddcully	its hard to believe, that they broke it in those about 15 patches
17:22	Reefersleep	Huh?
17:23	oddcully	haha! no i actually helped one today with a oneliner on the right place
17:23	Reefersleep	Of whom are you talking, and what patches?
17:23	oddcully	258 vs 273
17:23	Reefersleep	aah
17:23	Reefersleep	Hm
17:23	oddcully	i assumed your "included patches" there refers to my patchlevel
17:23	Reefersleep	Guess so
17:24	Reefersleep	Well
17:24	Reefersleep	Do you have any idea who I could ask about this stuff?
17:24	Reefersleep	A forum or specific peeps?
17:25	oddcully	do you have some account in the world, where you could test at least another version? if nothing else, i'd try to report a bug
17:25	Reefersleep	I guess I could just try a different version
17:26	oddcully	i meant, if you have an account to some unix box somewhere. opening a .clj file there should give some results
17:26	Reefersleep	oh, no. :/
17:26	Reefersleep	But I could run Linux from a USB I guess
17:26	Reefersleep	?
17:26	Reefersleep	Some Linux.
17:27	oddcully	na no hastle
17:29	sandbags	is it possible to redefine count for a record type?
17:30	gfredericks	don't think so
17:30	gfredericks	kind of the point of defrecord is to be map-like in all the mappy ways. deftype is the lower-level thing that lets you make whatever alien thing you want
17:31	sandbags	gfredericks: yeah, my record is essentially a list + some housekeeping info
17:31	sandbags	so i wanted it to act like a list in some contexts
17:31	gfredericks	it's probably cleaner to just explicitly convert it when necessary
17:32	sandbags	gfredericks: yeah, i was hoping to avoid having to create type specific functions for common ops
17:32	sandbags	but you could be right
17:32	gfredericks	metadata can be an okay way to sneak housekeeping info along for the ride if you're passing things through code you don't control
17:32	sandbags	gfredericks: i thought about that, but it didn't feel right
17:33	gfredericks	making a record have a different count is a lot less right :)
17:33	sandbags	okay, i guess i give up the yak shave and get on with solving my problems
17:33	sandbags	gfredericks: i'm not sure about that but i'll take your word for it
17:35	gfredericks	sandbags: magical data structures can confuse the hell out of people that don't know what you're doing
17:35	sandbags	gfredericks: and thanks for the info
17:36	sandbags	gfredericks: i do agree although i think context is important in making that judgement
17:36	gfredericks	I once spent hours debugging only to find out that clj-http or ring or something was using a magical case-insensitive map for http headers
17:36	sandbags	i suppose i could deftype if i really care enough
17:38	amalloy	!lm . abyss.exit x=turn
17:38	amalloy	oops
17:39	Reefersleep	oddcully: Thanks a lot for your help :)
17:39	gfredericks	amalloy: seems like a weird password to me but who am I to judge
17:39	gfredericks	I wouldn't have guessed it so I guess it's a good one
17:40	amalloy	/msg nickserv identify amalloy<3gfredericks4ever
17:40	oddcully	BUSTED!
17:40	Reefersleep	oddcully: I'm heading off. hope I'll figure it out eventually. Starting to consider checking out Emacs with Evil mode or maybe Spacemacs
17:40	oddcully	Reefersleep: yw, good luck, like any state ridden blob this is sometimes hard...
17:41	Reefersleep	Aye
17:41	Reefersleep	Thanks :)
17:41	gfredericks	amalloy: ha
17:53	danielcompton	Does anyone have a guide for porting clojure libraries to cljc libraries? I'm fine with writing the reader conditionals, but I'm getting stuck with how to build the ClojureScript part of it
17:57	arohner_	with friend, is there a way to make unauthorized requests return 40x rather than 302 to "/login"? I've found :login-failure-handler, but that only handles POST to /login, not unauthorized requests to e.g. /api/foo
17:58	arohner_	aha, looks like I need :unauthenticated-handler
18:01	TimMc	Anyone know of a lein plugin that will diff two versions of a project file? Perhaps just looking at what resolved dependencies differ between them?
18:01	TimMc	Thinking of writing one, don't want to waste effort.
18:02	justin_smith	TimMc: well, you could use read + data.diff I guess
18:02	kaiyin	,(get (iterate inc 1) 14)
18:02	clojurebot	nil
18:02	TimMc	justin_smith: This would be slightly more than that since I have to resolve the deps, and add a little around profiles.
18:02	justin_smith	kaiyin: vectors are associative, lazy-seqs are not
18:02	kaiyin	ok
18:03	justin_smith	kaiyin: but nth would work
18:03	justin_smith	,(nth (iterate inc 1) 14)
18:03	clojurebot	15
18:03	kaiyin	ah, cool.
18:03	justin_smith	the difference is that get guarantees constant time
18:03	kaiyin	i see.
18:03	justin_smith	but there is no constant time way to get the nth item of a lazy-seq
18:04	kaiyin	sure, you might have to realize stuff.
18:05	TimMc	justin_smith: What's data.diff?
18:06	justin_smith	,(require 'clojure.data)
18:06	clojurebot	nil
18:06	justin_smith	,(dir clojure.data)
18:06	clojurebot	Diff\nEqualityPartition\ndiff\ndiff-similar\nequality-partition\n
18:06	justin_smith	,(doc clojure.data/diff)
18:06	clojurebot	"([a b]); Recursively compares a and b, returning a tuple of [things-only-in-a things-only-in-b things-in-both]. Comparison rules: * For equal a and b, return [nil nil a]. * Maps are subdiffed where keys match and values differ. * Sets are never subdiffed. * All sequential things are treated as associative collections by their indexes, with results returned as vectors. * Everything else (including...
18:06	TimMc	Man, how long has this been around?
18:06	TimMc	,(-> clojure.data/diff var meta)
18:06	clojurebot	{:arglists ([a b]), :doc "Recursively compares a and b, returning a tuple of\n [things-only-in-a things-only-in-b things-in-both].\n Comparison rules:\n\n * For equal a and b, return [nil nil a].\n * Maps are subdiffed where keys match and values differ.\n * Sets are never subdiffed.\n * All sequential things are treated as associative collections\n by their indexes, with results returned...
18:06	TimMc	,(-> clojure.data/diff var meta :added)
18:06	clojurebot	"1.3"
18:06	justin_smith	,(clojure.data/diff {:a 0 :b [1 2]} {:a 0 :b [1 2 3]})
18:06	clojurebot	(nil {:b [nil nil 3]} {:b [1 2], :a 0})
18:06	TimMc	WTF, I need to go spelunking again.
18:07	justin_smith	heh :)
18:09	justin_smith	anyway, I could see data.diff being helpful in comparing two project maps
18:10	justin_smith	even if it has to be after some normalization
18:11	TimMc	For now my use-case is "what dependencies changed between these two git commits".
18:12	TimMc	I'd like to eventually have this be integrated into a build agent so that Github pull requests can be annotated with a dep diff.
18:12	justin_smith	get project files -> extract :dependencies -> put in sets -> set/difference ?
18:12	TimMc	more or less
18:12	justin_smith	ahh, that's a cool idea
18:12	TimMc	Not a huge amount of work, obviously.
18:13	justin_smith	it would be useful to do it with recursive dependencies
18:13	TimMc	exactly
18:13	TimMc	"Oh, clj-http updated its version of Apache HTTP client? Fascinating."
18:14	m1dnight_	why dont I ever have any good ideas like that! :p
18:15	justin_smith	or "this one dep I added has 1,000 deps of questionable quality?"
18:15	oddcully	quit slacking around in irc! ;P
18:16	oddcully	and print it out in a git bisect
18:16	TimMc	m1dnight_: Becuase you haven't had the pleasure of dependency hell recently?
18:18	m1dnight_	just today i was bragging about how lein is so fantastic with deps!
18:18	m1dnight_	is there a plugin to detect unused deps? i think i could manage that
18:18	m1dnight_	i had deps hell today with cabal too though (haskell)
18:19	oddcully	there ya go! this is a good idea
18:20	justin_smith	m1dnight_: I think eastwood can find unused required namespaces
18:20	justin_smith	that would maybe be a start
18:20	wasamasa	argh, why does C-c C-c in figwheel's repl just abort the process
18:21	justin_smith	wasamasa: within what interface?
18:21	wasamasa	justin_smith: I'm using it from the shell
18:21	wasamasa	"Exit: Control+C or :cljs/quit"
18:21	oddcully	justin_smith: eastwood left me in the eastern woods while trying out clara rules
18:22	wasamasa	I'd expect it to happen on C-d
18:22	justin_smith	wasamasa: C-c is kill, C-d is end-of-input
18:22	oddcully	is there a way around to have import the defrecords (for their class-iness)?
18:22	amalloy	wasamasa: i think i submitted a patch with that feature added, a long time ago
18:23	amalloy	to cljs, not figwheel or whatever
18:24	justin_smith	wasamasa: note that if you have anything typed in but have not hit return, C-d does nothing
18:24	wasamasa	justin_smith: of course, just like in everything else on linux
18:24	justin_smith	right, so why would C-c do anything different?
18:24	wasamasa	where C-c aborts the current computation and C-d ends the process
18:25	justin_smith	aborting the current computation is not a standard behavior
18:25	justin_smith	and C-d is eof, and that is not always ending the process
18:25	amalloy	justin_smith: a lot of repl-ish tools do that with C-c though
18:25	wasamasa	it is, type in something in a shell prompt, hit C-c and watch the next one coming in
18:26	wasamasa	so, you can use a C-c C-d chord to quit pretty much any shell
18:34	justin_smith	hmm, I always thought of C-c as "kill the program in the foreground", but I guess that's less widespread than I thought
19:06	gfredericks	does anybody have non-trivial test.check test suites and would like to help me test the performance of the new RNG code?
21:01	creese	What does this mean? java.lang.ClassCastException: clojure.test$test_vars$fn__7209 cannot be cast to clojure.lang.Atom
21:01	justin_smith	creese: inside test-vars, an anonymous function is created. Somebody is trying to deref it
21:02	justin_smith	or maybe swap! on it
21:02	creese	there is a swap!
21:02	creese	(defn stubbed-publish!
21:02	creese	[_ message]
21:02	creese	(swap! stubbed-queue conj message))
21:02	creese	What's wrong with this?
21:02	justin_smith	what is stubbed-queue ?
21:03	creese	atom set to nil
21:03	creese	(def stubbed-queue
21:03	creese	(atom nil))
21:03	justin_smith	if that's the case, then that isn't your issue
21:03	justin_smith	do you have a stack trace to go with that error?
21:03	creese	yeah
21:03	justin_smith	if you can share it on refheap.com or gist or something that would help
21:04	justin_smith	don't paste the whole thing here though
21:04	creese	https://gist.github.com/creese/18e701ecfd36bc0c80d4
21:04	creese	I would never do
21:04	justin_smith	so persister-test has something called init
21:04	justin_smith	and it calls reset! on a function
21:05	justin_smith	that's the issue here
21:05	creese	(defn reset-queue!
21:05	creese	[]
21:05	creese	(reset! stubbed-queue []))
21:06	creese	stubbed-queue is an atom
21:06	justin_smith	is that called in init?
21:06	justin_smith	because init is the one doing it
21:06	creese	(defn init
21:06	creese	[]
21:06	creese	(reset! system {:db-spec nil :out-queue {:event nil}}))
21:06	justin_smith	I bet system isn't an atom
21:06	justin_smith	I bet it's a function
21:06	creese	(def system
21:06	creese	(atom nil))
21:06	justin_smith	that's what the stack trace is saying at least
21:07	justin_smith	trying adding (print (type system)) to the definition of init
21:07	creese	how do you get that from the stack trace? (not doubting… just...)
21:08	justin_smith	the stack trace tells you which functions were called
21:08	justin_smith	the innermost at the top
21:09	justin_smith	so from your stack trace, line 17, we see that persister-test is called by the test setup
21:09	justin_smith	err, I mean something called init inside persister-test
21:09	justin_smith	and that calls reset
21:09	justin_smith	*reset!
21:10	justin_smith	and the next thing, we get an fn that cannot be cast to atom
21:10	justin_smith	so it has to be in init that the problem is happening (or at least the symptom)
21:11	creese	there must be another "system" that is taking precedence
21:11	justin_smith	yeah, could be a scope problem
21:11	creese	main has one
21:12	creese	but it's an atom there too
21:12	justin_smith	stack traces may be confusing, but in my experience they don't lie
21:14	creese	where do you get L17?
21:14	justin_smith	the gist has line numbers
21:14	TimMc	justin_smith: Or you may not have the whole thing, such as with pst.
21:14	TimMc	which drops part of the chain sometimes :-(
21:14	justin_smith	TimMc: fair enough, but this looks like the real deal
21:15	creese	justin_smith: oh, I thought you mean L17 of the code
21:16	justin_smith	sorry, I should have been more explicit
21:16	justin_smith	line 17 in that stack trace, moving up, is the part that is running your code
21:18	creese	I change the name to "system2" and it still does it.
21:21	justin_smith	did you try adding the print to show the type?
21:21	creese	yeah, no
21:22	creese	wrong file
21:22	creese	persister != processor
21:23	justin_smith	oh, so you had an error in persister and were trying to fix it in processor
21:23	creese	yeah :(
21:48	gfredericks	hello
22:14	madan	I want to try out Om for React Native application, but couldn't find any DETAILED discussions happening - just a couple of very short videos in youtube and supporting git repo. Can someone share me any good material?
22:21	justin_smith	madan: have you looked at http://swannodette.github.io/todomvc/labs/architecture-examples/om/ and https://github.com/omcljs/om/wiki/Basic-Tutorial ?