#clojure – 2015-06-19

2015-06-19

00:32	justin_smith	yedi: try searching for "debouncing"
00:33	yedi	thanks
00:42	yedi	justin_smith: cool, this looks like itll do the job: https://gist.github.com/swannodette/5888989
00:42	yedi	now i just gotta think of what a good debounce time would be, prolly like 250ms
00:43	justin_smith	yedi: likely looking a the allowed delay between clicks in a double-click would be a good starting point
01:39	Jake_	can someone who knows datomic give me feedback https://groups.google.com/forum/#!topic/datomic/auHSz3evCuA
02:49	tmtwd	does clojure have a new operator?
03:00	noidi	tmtwd, there's some special syntax for calling the constructor of a Java class: (TheClass. arg1 arg2)
03:04	noidi	http://clojure.org/java_interop#Java%20Interop-The%20Dot%20special%20form-(Classname.%20args*)
03:05	noidi	ah, I had forgotten that there's the special form "new", to which the dotted form is expanded
03:05	noidi	in practice all you see is (TheClass.)
03:32	tmtwd	hello
03:42	tm89	hello
03:43	hellofunk	tm89: greetings
05:00	H4ns	what is a good way to configure clojure systems? i'd hope for a library that supports configuration files in edn.
05:19	tmtwd	lein?
05:23	egli	H4ns: https://github.com/weavejester/environ
05:27	H4ns	egli: thanks!
05:42	H4ns	hm. environ seems to be leiningen centric and not offer a mechanism that allows edn files for configurations (unless it is named .lein-env and resides in the current wd)
05:43	bluesky44	in writing a ClojureScript macro (in Clojure), how does one go about using a custom function that is defined in ClojureScript? (I'm trying to write the <? macro mentioned here: http://swannodette.github.io/2013/08/31/asynchronous-error-handling/)
05:43	bluesky44	I've written a throw-err function but don't know where to put it.
05:44	bluesky44	If it's in my macros.clj file, I get a 'no such namespace: js' error.
05:44	bluesky44	https://gist.github.com/mhuebert/2221c18e9df11f2fd766
05:48	kungi	I am trying to send messages via postal and keep getting this error: "nodename nor servname provided, or not known"
05:48	kungi	This seems to hint on dns resolution
05:48	kungi	How can I debug this?
05:52	kungi	Nevermind I had an error in my hostfile
05:52	kungi	:-(
06:37	kaffeeboehnchen	Has anyone an idea why I always get an 404 whenn the code runs into "false" or "error"? "true" is working fine. http://paste42.de/8231/ (httpkit -> compojure)
06:50	wasamasa	no error callback?
06:53	kaffeeboehnchen	wasamasa: What do you mean?
06:53	wasamasa	kaffeeboehnchen: yesterday someone mentioned your library is using futures or something
06:54	wasamasa	kaffeeboehnchen: usually you have one for the success and another one for the error case
06:54	kaffeeboehnchen	wasamasa: http-kit is using promises
06:54	kaffeeboehnchen	but compojure is used for routing and that should just return the result of that function
06:56	kaffeeboehnchen	ah, I guess I have to write ring handler https://github.com/ring-clojure/ring/wiki/Concepts#handlers
07:53	justin_smith	H4ns: I have used environ to select a file name to load for config
07:54	H4ns	justin_smith: i kind of like the flexibity of environ and am now using it together with edn files at well-known locations.
07:54	justin_smith	yeah, sounds pretty much like what I was talking about
07:55	H4ns	well, i'm merging environ/env with whatever i'm reading from the selected configuration files.
07:55	H4ns	but everyone to their liking
07:55	kaffeeboehnchen	By the way, writing the ring handlers helped for my problem earlier.
08:20	elben	What other languages support symbols (e.g. :name) other than Ruby, Clojure and Scala?
08:21	wasamasa	every other lisp dialect?
08:22	justin_smith	elben: to be clear, :name is not a symbol, it is a keyword (I think Ruby calls keywords symbols though)
08:22	elben	yes, I meant that.
08:23	wasamasa	just like the lisp implementation its author studied :P
08:23	wasamasa	(type-of :foo) ;=> symbol
08:23	justin_smith	wasamasa: what weirdo lisp implementation was that?
08:23	wasamasa	justin_smith: the one living inside emacs
08:24	justin_smith	WEIRD and how did I not know that...
08:24	wasamasa	see http://www.slideshare.net/yukihiro_matz/how-emacs-changed-my-life for details
08:24	H4ns	in common lisp, keywords are symbols in the special "KEYWORDS" package
08:24	wasamasa	I've stumbled on a few of these while reading ruby C sources
08:24	H4ns	it is just clojure making them be totally separate
08:24	wasamasa	like, them reusing the convention of Qtrue, Qfalse and Qnil although none of these are quoted things :P
08:25	justin_smith	wasamasa: haha, cargo cult
08:26	TEttinger	I think LiveScript supports a sort of keyword equivalent. you can do \something , and it will compile to "something"
08:26	TEttinger	but it is still a string
08:27	justin_smith	my coworkers are constantly getting keyword / symbol wrong (because it was an ex ruby shop), and the big a-ha for me was of course that ruby is not homoiconic, so "symbol" as we know it is not a meaningful thing there
08:32	elben	I use those words interchangably at work (Ruby)—I think my co-workers understand…
08:33	justin_smith	elben: but we do clojure, so when they say symbol and mean keyword I often get confused
08:33	elben	Yes, an important distinction there :)
09:46	zathras	Hi. I have a config file written in clojure and would like to extract some info out of it (things like a hostname definition etc). Does clojure provide a beautyfier to list/dump code or can I even use it to read/et this information into a bash script somehow?
09:46	zathras	*get
09:47	wasamasa	pprint?
09:49	zathras	wasamasa, ty. I am new to clojure. Can I use pprint from the commandline somehow?
09:49	zathras	looking at the docs it seems at first sight something to be used from within a clojure program.
09:49	wasamasa	it is
09:50	wasamasa	generally clojure isn't really something you'd use for commandline utilities
09:50	wasamasa	it's more of a fit for long-running servers you talk to with something else
09:51	zathras	I have Riemann (http://riemann.io) installed. It's configurationfile is in clojure. I want to parse that configfile and I am looking for the best way to do that. Currently I look at regexes however I do not mind making the task easier if possible
09:51	zathras	hence my asking here
09:57	ordnungswidrig	What are my options for mocking fns in clojure.test tests? I know of with-redefs-fn but thats pretty low level
09:58	Duke-	zathras: I guess you could use an EDN parser for python or ruby, if you don't want to use Clojure itself (and start a JVM) in the script
09:59	Duke-	doesn't sound much easier than regexes though I guess
09:59	zathras	Duke-, what is an EDN parser?
10:00	zathras	I am fine with python, but not familiar with "EDN"
10:01	Duke-	EDN is the format of Clojure code (or rather a subset)
10:03	zathras	ty Duke- , I will look into it
10:17	kwladyka	after months of learnig clojure i am ready to back to the topic http://stackoverflow.com/questions/29867671/clojure-architecture-like-uncle-bob-did/29985761#29985761 - do you recommend watch/read someting more then http://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html and http://blog.find-method.de/index.php?/archives/209-Dependency-inversion-in-Clojure.html
10:25	kwladyka	topic: clean architecture in Clojure
10:25	j-pb	just looking at that makes my brain melt
10:26	j-pb	am I the only one to consider the architectural patterns an antipattern?
10:27	puredanger	I haven't read it yet, but I suspect http://www.rkn.io/application-architecture/ would be of interest
10:37	kwladyka	j-pb, it depend witch one ;)
10:37	kwladyka	in my opinion architecture is one of the most important thing durgin development
10:37	j-pb	well, I kinda like the microservice stuff that has come up in the clojure world recently
10:38	kwladyka	it is easy to write something but develop this 5 years not
10:38	j-pb	yeah but trying to press your application into a pedetermined shape is pretty harmfull imho
10:39	j-pb	all of these articles mention multimethods and protocols as a great design tool
10:39	j-pb	while they are absolutely horrible and should only be used if functions and data fail
10:39	kwladyka	yes, but this one is really close to how i am thingking about that
10:39	kwladyka	i want have business model in core layer separater with "not important code"
10:41	kwladyka	when i am talking about business i say "user register, fill email and password and have to confirm by link in email" not "after user fill forms save data in postgresql and then...."
10:41	j-pb	I still woudldn't use a lot of the technologies mentioned before
10:41	kwladyka	but ofcourse nobody know the best soltuion for everything :)
10:42	j-pb	the stack overflow answer is especially ugly
10:42	kwladyka	what do you mean when say "technologies"?
10:42	j-pb	protocols and reify for example
10:42	kwladyka	why?
10:42	clojurebot	why is startup slow is busy compiling the `for` macroexpansion
10:43	j-pb	if you want to design a new datastructure or need some performance tuning, records are great, for everything else they offer mostly disadvantages over data
10:43	maxpn	place advice me how to do next (sample in javascript): if( a = f1() ) { return g1(a);} if(a = f2()) { return g2(a);} ...
10:44	maxpn	like (cond ... ) but with returned value
10:44	j-pb	they are not really persistent (kinda with automatic reader literals), they are polymorphic so there are potential ambiquities which method is actually called by just looking at code
10:44	snowell	maxpn: (cond) does return the value
10:45	j-pb	the load/save-data protocol is typical OO crap, persistent datastructures are already persistent
10:45	maxpn	snowell: no, I mean "get value from function and return f(value) if value is true"
10:45	kwladyka	j-pb, so in your opinion how would you do architecture?
10:46	maxpn	snowell: and there are many such functions like in (cond ... )
10:46	justin_smith	j-pb: in what way are records as defined by defrecord not persistent?
10:47	j-pb	kwladyka: keep it small, keep it simple, use higher order functions, the "keep your depencies as a DAG and avoid cycles" from the article is actually pretty good
10:47	j-pb	kwladyka: it epends on the thing I build really
10:47	j-pb	justin_smith: you can't serialize their behaviour with them
10:48	snowell	maxpn: I would probably do nested `if-let`s
10:48	justin_smith	j-pb: their behavior is in their definition, if you can load their reader literal, you have loaded their behavior
10:48	snowell	,(if-let [a false] :a (if-let [b true] :b (if-let [c true] :c)))
10:48	clojurebot	:b
10:48	j-pb	justin_smith: you always assume that there is an application with your code on the other end, or at least some conforming code that has the right reader literal
10:49	maxpn	snowell: nesten if-let's? no more elegant way? ... :(
10:49	justin_smith	j-pb: oh yeah, don't put your records on the wire
10:49	snowell	But instead of the true/false, do the function call. If it returns anything truthy it'll set the value and you can pass it to the g function
10:49	justin_smith	that's not about persistence, that's about communicating between processes
10:49	j-pb	justin_smith: yeah, that's the nice thing about persistence for me, that it's independent of the context of execution
10:49	justin_smith	OK
10:49	snowell	maxpn: Sure, there might be a more elegant way. I'm still kind of learning myself :)
10:50	j-pb	justin_smith: yeah kinda, but then serialized java objects would also be persistent datastructures, which they're not really
10:51	justin_smith	j-pb: well serialization of anything stateful is going to be a mess, yeah
10:52	j-pb	snowell maxpn: there is, the maybe monad, afaik we have that now as a threading macro let me check
10:52	justin_smith	j-pb: some-> / some->> is almost like maybe I guess
10:52	j-pb	justin_smith: yeah exactly that one
10:53	maxpn	really I need some kind of form validation - "if filed1_err return err1; if field2_err return err2; ... all ok ..."
10:53	j-pb	,(macroexpand '(-> x f g))
10:53	clojurebot	(g (f x))
10:53	j-pb	,(macroexpand '(some-> x f g))
10:53	clojurebot	(let* [G__78 x G__78 (if (clojure.core/nil? G__78) nil (clojure.core/-> G__78 f)) G__78 ...] G__78)
10:53	justin_smith	maxpn: something like cond-> then?
10:53	justin_smith	(doc cond->)
10:53	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."
10:54	justin_smith	maxpn: since you have multiple error states that you want to destinguish
10:54	maxpn	o, sorry, I was not correct - "if( err_msg = valid_field1()) { return err_msg;} ... )"
10:55	maxpn	I have to save tha value of comapsion like if-let
10:55	maxpn	but chained if-let is my last chance :)
10:56	j-pb	hrmmm
10:56	j-pb	if( a = f1() ) { return g1(a);} if(a = f2()) { return g2(a);}
10:56	j-pb	thats basicallya cond right?
10:56	kwladyka	justin_smith, and what is your opinion about architecture? how it should look?
10:56	j-pb	because the return will short circuit
10:57	snowell	j-pb: I think the problem is it's not checking "a == f1()," it's setting the return value to a and using it
10:57	maxpn	no. (cond ..) is like "if (f1()) { ... }" result of function is lost
10:57	j-pb	maxpn: could you restate your problem?, I feel like we have 3 semantically different things here
10:57	snowell	And evaluating whether or not said return value is truthy
10:57	justin_smith	kwladyka: that is a very broad question! - what I have found to work well is plain data structures, stuartsierra's component (or something like it) to manage data deps between namespaces, and prismatic/schema to describe exactly those properties of nested data you are relying on
10:57	j-pb	maxpn: so you do a = (cond
10:58	j-pb	ah I see what you mean
10:58	maxpn	"if (a = f() ) ... " is not just a condition - it is an assignment to var a
10:58	j-pb	yeah
10:58	j-pb	so you want both a as well as the result of its application to something right?
10:58	justin_smith	maxpn: cond allows the then clause to get the result of the condition as an arg
10:59	justin_smith	maxpn: oops, not cond, condp
10:59	justin_smith	(doc condp)
10:59	clojurebot	"([pred expr & clauses]); Takes a binary predicate, an expression, and a set of clauses. Each clause can take the form of either: test-expr result-expr test-expr :>> result-fn Note :>> is an ordinary keyword. For each clause, (pred test-expr expr) is evaluated. If it returns logical true, the clause is a match. If a binary clause matches, the result-expr is returned, if a ternary clause matches, its result-fn, which must be a unary fu
10:59	maxpn	moment...
11:00	j-pb	(inc justin_smith)
11:00	lazybot	⇒ 265
11:02	kwladyka	justin_smith, what with separatig business model/logic from other code?
11:02	justin_smith	kwladyka: namespaces organize things, if you use immutable data you don't really need information hiding or any of that
11:02	justin_smith	(mostly)
11:04	kwladyka	but dont you feel it will be good to close circle with business logic and on this circle put code like database queries etc. and on this circle put interface?
11:04	kwladyka	discussion began with http://stackoverflow.com/questions/29867671/clojure-architecture-like-uncle-bob-did/29985761#29985761
11:10	kwladyka	just i fell i have to close some things in smaller "independent" parts
11:12	justin_smith	kwladyka: I actually think protocols make sense for inserting one's own functionality into a more general library (ring is a perfect example of how well this works), but without mutable state you don't really need hiding, and local mutable state is worse than global mutable state
11:15	kwladyka	so how to do architecture which i can make system as small parts of something bigger. I don't want mess with core and GUI - it has to be separate. Also i preffer to separate database functions. And later.... if i will find some part of system like payments is reapatable and always the same maybe i want made from this module/microservice
11:15	binjured	is there a string buffer sorta thing that works with (with-open)?
11:16	kwladyka	Is there any other option like uncle bob clear architecture?
11:20	justin_smith	binjured: I don't know, does with-out-str count?
11:22	maxpn	thank you all, now I use (condp ... :>> ...)
11:22	binjured	justin_smith: heh, not really. i guess i could pass out as a writer, but it feels dirty.
11:22	hellofunk	sometimes when i write i pass out all the time
11:23	justin_smith	kwladyka: as I mentioned before there is the component lib, and that makes it easy to provide data or functionality between self-contained pockets of functionality
12:07	mmeix	ok, beginner's question again: how much do I really need to know about POM files (xml, properties)?
12:08	justin_smith	mmeix: usually nothing at all, if you are interacting with the maven system it should be via lein which just makes these pom files for you
12:08	mmeix	ok
12:08	mmeix	or boot
12:08	mmeix	thanks
12:08	justin_smith	sure, boot uses the maven system too
12:09	mmeix	set and forget :-)
12:11	mmeix	the POMs are used to build the final jars, right?
12:12	justin_smith	they are built to go with the jars, and then the maven system uses the pom in the jar to see its deps and version etc.
12:12	mmeix	ah, ok
12:12	mmeix	thnx afgain
12:12	mmeix	-f
12:14	mmeix	or an Afghan, sheared ("afgain")
12:17	mmeix	(just trying out boot ...)
12:30	binjured	anybody know how to find out where a (require) library was loaded from on the filesystem?
12:34	TimMc	binjured: Yeah, but it's ugly.
12:36	binjured	TimMc: i managed to confirm a suspicion without it ... if something doesn't show up in `lein deps :tree` i guess i have to assume it's coming from my lein profile?
12:38	TimMc	I'll write something up anyhow.
12:43	TimMc	...this works in one of my projects but not another. :-(
12:44	binjured	man, this is weird. for some reason lein and maven both pull down like 5 versions of cheshire, despite only one appearing in `lein deps :tree`, `mvn dependency:tree`, and `mvn help:effective-pom`
12:45	TimMc	Might be pulling down all the versions it encounters in the dependency graph, even though only one actually wins out to be used for the classpath.
12:45	TimMc	or someone has specified a version range
12:46	binjured	TimMc: yeah, the annoying part is that the wrong one is winning so the app breaks.
12:47	TimMc	Does lein deps :tree give you some conflict info at the top of the output?
12:47	binjured	nope
12:49	TimMc	What version of lein?
12:50	binjured	2.5.1
12:53	bitts	Reading an Oracle column of type NUMBER(2) returns a BigDecimal in clojure.core.jdbc version 0.3.6. But http://dev.clojure.org/jira/browse/JDBC-57 says it was fixed a few years ago. Any info on this?
12:54	bitts	[org.clojure/java.jdbc "0.3.6"] rather..
12:55	hiredman	did you read the comments on the ticket? it reads like the decision was to add extension points so users can change the behavior, not actually changing it
12:57	bitts	hiredman: Thanks, I missed that.
12:57	bitts	hiredman: now to figure out the decision points. :rowfn perhaps.
12:59	TimMc	Interesting: When I run (.getResource (class #()) "clojure/core__init.class") in lein repl, it yields a URL in some projects and nil in others.
12:59	TimMc	I think the latter happens in AOT'd projects, but why?
13:01	binjured	heh, so weird. even after removing everything from my ~/.lein/profiles, all dependencies from the :dev profile of my project, and every lein plugin... still, it downloads old versions of cheshire.
13:01	justin_smith	binjured: lein deps :tree will tell you why this is happening
13:01	hiredman	binjured: what evidence do you have that it downloads old versions of cheshire?
13:02	binjured	justin_smith: no, it will not... only 5.4.0 is mentioned anywhere.
13:02	binjured	hiredman: when i run `lein run` it says so ;)
13:02	hiredman	binjured: what do you mean it says so?
13:03	binjured	hiredman: (1) remove from local maven repo (2) `lein run` (3) "Retrieving cheshire/cheshire/4.0.3/cheshire-4.0.3.pom from clojars"
13:04	binjured	plus a few other versions
13:04	binjured	none of which appear in any lein tree, maven tree, or effective pom
13:04	hiredman	binjured: lein may download transitive dependencies that end up being overriden
13:05	hiredman	lein classpath will show you the classpath lein uses
13:12	TimMc	binjured: You probably have like 5 dependencies that ask for different versions of cheshire, so maven gets curious about them and downloads all of them.
13:13	binjured	TimMc: well, maven's curiosity is killing me!
13:13	TimMc	Then one wins according to a complicated set of precedence rules, thunderdome-style death matches, and coin flips.
13:13	TimMc	(I have been assured it is actually deterministic and fairly straight-forward, but have not looked into it myself.)
13:14	TimMc	lein deps only shows the winner.
13:14	binjured	i finally managed to get it to stop downloading most of them, but the super crazy part now is that i don't even know where `cheshire.core` is coming from because in the repl the contents of the NS are wrong for either version found in ~/.m2
13:14	TimMc	Lessee, I think I wrote a tool to find these.
13:16	TimMc	binjured: Here, it's not released as an artifact yet, but download this, run `lein install`, add it to your :plugins, and run `lein arbuscule :print` in your project: https://github.com/timmc/arbuscule
13:16	TimMc	That will show you the full dependency graph.
13:16	binjured	it's a "the phone call is coming from... inside the house!" situation now. damn you, maven dependency nonsense! you followed me from java and keep haunting me!
13:17	binjured	i will check it out, thank you
13:17	TimMc	I think it's technically... aether? that backs both maven and lein.
13:18	TimMc	arbuscule basically gives you an adjacency list right now, not a fully played-out tree.
13:20	TimMc	It's basically just a frontend onto pomegranate.
13:51	noncom	is anyone familiar with overtone here?
13:51	noncom	i wonder if it is possible to apply effects to sampled instruments...
13:53	CoaxialLatency	i'd hope so
13:56	justin_smith	noncom: yeah, overtone is network bindings to the supercollider UDP server api
13:56	noncom	yeah, it is :)
13:57	noncom	i did not find an api or docs on applying effects to sampled instruments though...
13:57	justin_smith	noncom: so yeah, just like in supercollider, any audio output can be run through any effect that takes audio input (look into "synth groups" for one approach to this in sc at least)
13:57	noncom	ah, so i re-route the sampler output through an effect...
13:57	justin_smith	noncom: in the sc engine, anything that can produce audio can be plugged into anything that takes audio input
13:58	noncom	does supercollider have this notion of "wires" ?
13:58	justin_smith	noncom: exactly, it's like a mixing board
13:58	noncom	cool, that makes it rather clear
13:58	justin_smith	if you look into synth groups it covers all this stuff
13:58	noncom	very nice, i'll head right there!
13:59	justin_smith	now how nicely overtone provides access to any of this is of course another question, but I would expect it to be usable
13:59	justin_smith	noncom: http://www.dewdrop-world.net/sc3/tutorials/index.php?id=1
14:00	noncom	i am at a crossroads actually
14:00	noncom	i have to chose between minim and overtone/sc
14:01	justin_smith	noncom: be sure to check out pink too if you want to try anything experimental - pink is implemented in pure clojure
14:01	justin_smith	(well mostly pure clojure, I think it might have a java class file or two)
14:01	justin_smith	but pink is going to mostly only be useful if you want to try experimental dsp algos
14:01	hellofunk	noncom: https://www.youtube.com/watch?v=wDcN7yoZ6tQ
14:02	justin_smith	hellofunk: yup, that's the project. Steven Yi is one of the lead devs of csound, so he knows his shit.
14:02	noncom	wow
14:02	hellofunk	justin_smith: yes he's huge. i don't mean he's fat. i mean a lot of people who hardly have heard of clojure follow his work
14:03	noncom	yeah, csound is a big thing
14:03	noncom	also, he has a very nice emacs setup
14:04	hellofunk	noncom: looks like aquamacs or something. tabbed buffers?
14:04	noncom	maybe maybe.. idk, i do not use emacs often, but sometimes i use it.. still looking for a perfect setup
14:05	noncom	afaik most people are still looking... :)
14:05	CoaxialLatency	what do you use mostly?
14:07	noncom	CoaxialLatency: currently i am mostly on prelude + the bliss theme + paredit + autocomplete + smex and some other things i do not remember exactly
14:08	noncom	but i am not using it for clojure, i program dotlisp in it
14:09	CoaxialLatency	i see
14:15	seangrove	Hey all, trying to use immutant 2.0.1, doesn't seem to be able to find immutant.web.websocket ns
14:16	seangrove	I'm using [org.immutant/immutant "2.0.1"] in my project.clj, which I think should pull in all the deps
14:18	seangrove	Looks like it might have been unified under immutant.web.async ns and the docs aren't updated...
14:19	tcrawley	seangrove: which docs are you looking at?
14:20	seangrove	tcrawley: http://immutant.org/tutorials/web/#Development_Mode
14:21	tcrawley	seangrove: ah, those are the 2.x alpha docs - you should look at http://immutant.org/documentation/current/apidoc/guide-web.html (transitively linked from the top of that tutorial)
14:23	seangrove	tcrawley: And the 2.x alpha is older than 2.0.1, right?
14:23	tcrawley	correct
14:23	seangrove	Just making sure...
14:23	seangrove	Great, thanks
14:23	tcrawley	it's really 2.0.0.alpha1. and my pleasure!
14:33	TimMc	binjured: If you're curious, this is how I check where a namespace was loaded from: https://gist.github.com/timmc/1dc26376e3cc475e125e
14:36	seangrove	tcrawley: Is there a way to access the session from a websocket on-open event?
14:36	seangrove	Looks like the only thing passed in is the channel
14:38	tcrawley	(immutant.web.async/originating-request ch) will give you the request map which will give you the session as it was when the channel opened
14:41	binjured	TimMc: thanks. really losing my mind here... (.getResource (class #()) "cheshire/core.clj")
14:41	binjured	#object[java.net.URL 0x6f06d24e "jar:file:/home/tom/.m2/repository/cheshire/cheshire/5.4.0/cheshire-5.4.0.jar!/cheshire/core.clj"] <-- this is correct. if i open that file, i see `(def decode-strict parse-string-strict)` ... despite this, neither of those names exist in the require'd namespace.
14:42	creese	Ran into a strange case verifying a fressian encoding. Are fressian encodings unique?
14:45	TimMc	binjured: What about cheshire/core__init.class ?
14:45	binjured	nil
14:49	binjured	TimMc: but then, (.getResource (class #()) "clojure/core__init.class") is nil too so i'm not sure how interesting that is.
14:52	TimMc	Does your project have any AOT namespaces?
14:53	TimMc	I still don't understand why that snippet doesn't always work, but I think it has to do with AOT.
14:53	binjured	like, pure java namespaces?
14:54	binjured	not familiar with what all gets AOT'd in clojure vs. not
14:55	TimMc	Do you have a :main or an :aot key in your project.clj?
14:56	binjured	a :main, yeah
14:57	TimMc	Try lein clean and set :main [^:skip-aot your.main.ns] just for the time being, then lein repl
14:58	TimMc	Leiningen automatically adds your :main ns to the aot list (though that will change in a future version.)
15:00	binjured	TimMc: "Option -m requires a valid namespace argument, not [my.main.ns]"
15:00	TimMc	If that doesn't make the test for clojure/core__init.class non-nil, then it's probably a bad idea to keep using the getResource approach (since I would have no more ideas about why it works/does not work.)
15:00	TimMc	Oh whoops, drop the brackets. :-)
15:02	binjured	it's not nil anymore
15:03	binjured	TimMc: the cheshire core__init.class is coming from leiningen itself, not the m2 repo
15:05	binjured	one of my user profile dependencies is [leiningen #=(leiningen.core.main/leiningen-version) :exclusions [cheshire]] but that exclusion is not doing what i thought it would.
15:08	TimMc	Hmm... now, that might be a REPL thing.
15:08	TimMc	The REPL has extra dependencies added to it that your code wouldn't have.
15:09	seangrove	tcrawley: Trying to access some session data in my websocket handlers https://www.refheap.com/b64aa3b5a40720b155c8d688b but the session is always empty - am I wrapping things in the wrong order?
15:13	binjured	TimMc: well, this particular repl is embedded in the app so it's definitely applying there too. removing that dep from my list and everything that used it resulting in getting the correct library back.
15:14	tcrawley	seangrove: yes, you should move the wrap-websocket call above wrap-session - if wrap-websocket is below it in the chain (above it in the middleware stack), wrap-session will never be called
15:14	whodidthis	i would imagine wrap-session middleware goes before ?assign-id
15:14	tcrawley	seangrove: that middleware had to be last in the thread in alpha1, but that is no longer the case
15:15	seangrove	tcrawley: Ah, My bad for reading the old docs, thought it had to be the terminating handler
15:15	tcrawley	yeah, no longer. sorry for the confusion
15:17	seangrove	No worries - that works well now, thanks!
15:17	tcrawley	good deal!
15:17	seangrove	Overall immutant seems pretty nicely put together
15:18	tcrawley	thanks! feel free to hang out in #immutant if you like
15:19	seangrove	tcrawley: Sounds good, it's in the init.el now
15:33	noncom	tcrawley: hi!
15:34	tcrawley	noncom: ahoyhoy!
15:35	noncom	tcrawley: someone adviced me to ask you
15:35	noncom	tcrawley: i have a couple of jars on clojars that are missing now!
15:35	noncom	like, they've been there and they disappeared
15:35	tcrawley	what jars?
15:35	noncom	what do you think?
15:35	noncom	wait a sec
15:36	noncom	[org.noncom/tuio4j "1.1"]
15:36	noncom	[com.illposed.osc/javaosc-core "0.3"]
15:36	noncom	these two
15:37	noncom	https://clojars.org/users/noncom the groups are not listed too
15:39	tcrawley	any idea when you deployed them? neither show up in the deploy event log that goes back 2+ years
15:40	tcrawley	and neither appear in the backup dir where we store a copy of deleted artifacts
15:43	tcrawley	noncom: javaosc-core is in maven central: https://search.maven.org/#artifactdetails\|com.illposed.osc\|javaosc-core\|0.3\|bundle
15:43	noncom	tcrawley: ah, i am sorry about javaosc-core, i deployed my osc on clojars and it disappeared, so i must have swithced to this one... that was some time ago, you see..
15:44	noncom	tcrawley: but i am 100% sure of [org.noncom/tuio4j "1.1"]
15:44	noncom	it is not there, right?
15:44	tcrawley	not that I can see, no
15:44	tcrawley	any idea when you deployed it?
15:44	noncom	i deployed it a while ago, maybe somewhere around the new year...
15:45	noncom	tcrawley: i am starting to think that i have fabricated the memory...
15:45	tcrawley	that's before my time with clojars, but I don't see a record of it anywhere
15:45	tcrawley	hey, I'm not saying you're crazy :)
15:45	gfredericks	~tcrawley is not saying you're crazy
15:45	clojurebot	Ok.
15:46	tcrawley	gfredericks: thanks!
15:46	noncom	hehe :) idk but the whole story is a little strange. just suddenly, moved on another machine and i find that lein fails to pull the dep...
15:46	tcrawley	gfredericks: speaking of crazy, will you buddy with me at STL?
15:47	tcrawley	noncom: is it possible you had it installed in your local ~/.m2/ so you never noticed it wasn't in an external repo?
15:47	noncom	maybe... looks like that was the case, i just thought i did deploy it to clojars
15:48	noncom	but apparently i did not for some reason...
15:48	gfredericks	tcrawley: you're coming???
15:48	lazybot	gfredericks: Oh, absolutely.
15:48	tcrawley	totes
15:48	gfredericks	birthday party!
15:48	tcrawley	_exactly_
15:49	gfredericks	and bhauman will be there too
15:49	tcrawley	indeed. we just need cfleming, et al to get the band back together
15:50	gfredericks	he's probably not speaking and so probably not coming I bet :/
15:50	tcrawley	yeah
15:51	gfredericks	and jim not coming?
15:52	tcrawley	he's a "maybe". he has a ticket, but isn't sure he can make it
15:54	gfredericks	maybe blackmail him
15:54	tcrawley	I'll see what I can do
15:54	tcrawley	jcrossley3: ^
15:58	binjured	does this make sense to anybody? https://gist.github.com/tdavis/e11c9c882f4eb27bd447 -- i've been trying to debig this for over an hour now, i am not returning a bufferedinputstream from anywhere and cannot figure out where it might be coming from.
15:59	justin_smith	binjured: is something trying to json-encode the request body object?
16:01	binjured	justin_smith: not that i'm aware of, no. though it doesn't seem to matter what i do in my actual request handler, so i guess it's somewhere in the middleware? i dunno.
16:03	justin_smith	yeah, likely middleware nonsense I guess
16:04	cfleming	tcrawley: Sniff sniff
16:05	tcrawley	we'll miss you my friend
16:07	jcrossley3	gfredericks: tcrawley has nothing on me
16:07	tcrawley	that sounds like a challenge
16:07	sdegutis	What's the best way to get from [[:a 1] [:b 1] [:b 3]] to {:a 1 :b 4} ?
16:09	amalloy	sdegutis: apply merge-with +
16:09	sdegutis	hmm thought it had something to do with merge-with, thanks
16:09	amalloy	well more specifically ##(apply merge-with + (for [[k v] '((a 1) (b 1) (b 3))] {k v}))
16:09	lazybot	⇒ {b 4, a 1}
16:13	H4ns	,(apply merge-with + (map (partial apply hash-map) [[:a 1] [:b 1] [:b 3]]))
16:13	clojurebot	{:b 4, :a 1}
16:29	cfleming	tcrawley: I must make it to STL one of these days
16:30	cfleming	tcrawley: It's a longish trip though!
16:32	gfredericks	cfleming: considering relocating to STL
16:32	mikerod	is it not the case that = and == are different for numerics in Clj?
16:33	gfredericks	[(= 3 3.0) (== 3 3.0)]
16:33	gfredericks	,[(= 3 3.0) (== 3 3.0)]
16:33	clojurebot	[false true]
16:33	gfredericks	,((juxt = ==) 3 3.0)
16:33	clojurebot	[false true]
16:37	tcrawley	cfleming: I'll be there, so it will totally be worth it
16:38	justin_smith	,(map (juxt identical? = ==) [3 3000 3000 3000] [3 (+ 1000 2000) 3000 3000.0])
16:38	clojurebot	([true true true] [false true true] [false true true] [false false true])
16:40	H4ns	what would be a good way to retrieve every other element from a seq? (1 2 3 4) => (1 3)
16:41	justin_smith	one way: (comp (partial map first) (partial partition 2))
16:42	oddcully	i see no points
16:42	H4ns	justin_smith: thanks!
16:47	amalloy	justin_smith: is that your final answer?
16:47	justin_smith	amalloy: I am sure there is something better, but that was the first thing I thought of
16:48	amalloy	well there is a builtin: ##(take-nth 2 '(1 2 3 4))
16:48	lazybot	⇒ (1 3)
16:48	justin_smith	man, I always forget that one
16:48	amalloy	H4ns: ^
16:48	H4ns	amalloy: much nicer, thanks!
17:02	pbx	PSA: i don't know that it will lure anyone away from the excellent refheap, but i added some clojure syntax detection to my pastebin at http://dpaste.com/ -- meaning if you paste clojure code it can automatically set the syntax
17:41	vhquang	hi everyone,
17:42	vhquang	I am very new to clojure, and am having a problem with pedestal library
17:42	vhquang	if anyone has experience with that library, can you spend few minutes help me out?
17:44	wasamasa	wasn't that this whole webframework thing?
17:44	vhquang	yes it it
17:44	vhquang	it is
17:44	wasamasa	well, the mindshare tends to go towards the opposite here
17:45	wasamasa	composing your web application by using ring and libraries complementing it
17:45	seangrove	,(into {} (map vec (partition 2 (interleave (keys {:a 10 :b 20 :c 30}) (repeat {})))))
17:45	wasamasa	so you'll probably find less support for it
17:45	clojurebot	{:a {}, :b {}, :c {}}
17:46	seangrove	,(into {} (partition 2 (interleave (keys {:a 10 :b 20 :c 30}) (repeat {}))))
17:46	clojurebot	#error {\n :cause "clojure.lang.Keyword cannot be cast to java.util.Map$Entry"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.Keyword cannot be cast to java.util.Map$Entry"\n :at [clojure.lang.ATransientMap conj "ATransientMap.java" 44]}]\n :trace\n [[clojure.lang.ATransientMap conj "ATransientMap.java" 44]\n [clojure.lang.ATransientMap conj "ATransientMap.java" 17]\n ...
17:46	justin_smith	seangrove: only vectors can be entries
17:46	vhquang	we are near a demo day, so switching library isn't the prefer path for me
17:46	seangrove	justin_smith: Ah, headed off my first question
17:46	justin_smith	also, the error message has a bug in it
17:46	vhquang	I just hope to find some temporary fix if possible
17:47	seangrove	Seconds question though, is there a cleaner way of resetting the values to {}
17:47	seangrove	(without bringing in mapvals)
17:47	justin_smith	,(zipmap (keys {:a 10 :b 20 :c 30}) (repeat {}))
17:47	clojurebot	{:a {}, :b {}, :c {}}
17:47	seangrove	bah! zipmap! Should have remembered
17:48	seangrove	Thanks as usual, justin_smith
17:48	seangrove	(inc justin_smith)
17:48	lazybot	⇒ 266
17:48	amalloy	seangrove: if you need to do something similar but more complicated, just about every "build a collection based on another one" problem can be written in terms of (into y (for [x xs] ...))
17:49	amalloy	,(into {} (for [[k v] {:a 10 :b 20 :c 30}] {k {}}))
17:49	clojurebot	{:a {}, :b {}, :c {}}
17:49	wasamasa	vhquang: well, you'll hardly get someone here to help you if you don't go into any further detail as nobody is bold enough to proclaim themselves gurus
17:50	justin_smith	wasamasa: speak for yourself
17:50	seangrove	justin_smith: I believe he was
17:51	vhquang	wasamasa, thanks for explaining that to me, I am very new to the community here
17:51	justin_smith	vhquang: in general, the thing that works best on IRC is to just ask your question and stay logged in
17:51	justin_smith	maybe repeat it if it's been a while and nobody responded
17:52	vhquang	the problem I have is with the io.pedestal.interceptor.helpers, when compiling the uberjar
17:52	justin_smith	and then like - maybe hours later - the perfect answer will show up out of the blue
17:52	vhquang	ah OK
17:55	vhquang	I have no problem running the pedestal project with lein, but running the compiled jar file giving me error: java.lang.IllegalArgumentException: No matching ctor found for class io.pedestal.interceptor.helpers$before
17:56	vhquang	and I use the AOT compilation as well
18:21	sdegutis	What's a dazzling way to transform the number 12345 into the string "12,345"?
18:22	amalloy	sdegutis: ask java to do it
18:22	sdegutis	amalloy: thanks I'll ask #java
18:22	amalloy	sdegutis: i mean the answer is java.util.text.NumberFormat, or something like that
18:22	amalloy	i forget what package it's in
18:23	sdegutis	,(.format (NumberFormat/getNumberInstance Locale/US) 35634646)
18:23	clojurebot	#error {\n :cause "No such namespace: NumberFormat"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: No such namespace: NumberFormat, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6543]}\n {:type java.lang.RuntimeException\n :message "No such namespace: NumberFormat"\n :at [clojure.lang.Util runtimeExce...
18:24	sdegutis	clojurebot: shut up nobody asked you
18:24	clojurebot	Pardon?
18:24	sdegutis	clojurebot: nothin just bsayin hi
18:24	clojurebot	excusez-moi
18:24	sdegutis	clojurebot: dont worry bout it bruh
18:24	clojurebot	Cool story bro.
18:27	sdegutis	,(.format (java.text.NumberFormat/getNumberInstance java.util.Locale/US) 1234567)
18:27	clojurebot	"1,234,567"
18:27	sdegutis	amalloy: I was kind of assuming you would say to use the mysterious cl-format function
18:27	amalloy	gross
18:27	sdegutis	Indeed.
18:28	sdegutis	But most of Clojure is gross.
18:31	irctc	hi
18:31	sdegutis	amalloy: you won the prize btw.
18:32	sdegutis	amalloy: cuz that worked.
18:34	sdegutis	amalloy: unfortunately you have to redeem the prize in person over irc
18:38	whodidthis	singletons4lyfe
18:40	whodidthis	imagine someone actually having multiple instances of numberformatters of a selected locale around, what an idiot
18:45	elvis4526	how does if check the boolean value of an expression ?
18:45	elvis4526	is it with true? ?
18:46	verma	I have a seq of vecs, I want to find the item I am interested in and change it, I could do a map over it and check if an item is the one I am looking for and return the updated item, but I would imagine that this approach would cause iteration beyond my item of interest, what's a good way of doing something like this?
18:46	verma	basically take the vec I am interested in and return a new one, maintaining its spot in the seq
18:47	andyf	elvis4526: At the Java byte code level, every value except false and nil is considered true
18:47	verma	I could do some drop-while take-while stuff, but I was wondering if there's a better way of doing this
18:47	amalloy	whodidthis: huh? getNumberInstance isn't a singleton, i'm fairly sure
18:47	verma	may be split-with
18:48	andyf	elvis4526: That is definitely not what checking with true? would do. That only returns true for the value true.
18:48	amalloy	maybe i am getting it mixed up with the getInstance of something else, like parsers instead of formatters, but i know something in there requires multiple instances, because it's not threadsafe
18:48	elvis4526	oh okay - thanks
18:48	amalloy	andyf: uhhhhh, i don't think that's the java bytecode level, that is a clojureism
18:48	amalloy	at the java bytecode level, one thing is true, which is the boolean true, and one thing is false, which is the boolean false
18:49	andyf	Maybe I didn't say it clearly enough. My meaning is that the Clojure compiler generates Java byte code that does the checks I describe.
18:49	amalloy	yes, that is certainly what the bytecode generated by clojure's 'if special form does
18:49	whodidthis	oh, didnt think getInstance type of things were used for that kind of stuff too, bad joke heh
18:52	whodidthis	then again i dont know whats going on with the logging stuff at all either so mebbe shouldn't comment about java
19:06	hiredman	amalloy: simpledateformat
19:06	amalloy	$javadoc java.util.SimpleDateFormat
19:06	amalloy	oh well
19:06	amalloy	$javadoc java.text.SimpleDateFormat
19:06	lazybot	http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
19:06	amalloy	yeah, that's the vile thing indeed
19:57	hyPiRion	Omg, there's an actual ComplexDateFormat: http://www-01.ibm.com/support/knowledgecenter/SSEPH2_11.1.0/com.ibm.ims11.doc.classicjdoc/topics/com/ibm/ims/base/ComplexDateFormat.html
19:57	hyPiRion	"extends java.text.SimpleDateFormat"
20:42	vhquang	hi, can someone help me to understand the difference between (require ....) and (:require ....) ? I cannot get a good answer from google
21:06	creese	Can you deploy pedestal as an uberjar?
21:08	mearnsh	vhquang: require is a function, normally you'd only use it at a REPL, favouring the use of :require inside an ns macro otherwise
21:08	mearnsh	they both do the same job, but :require only works inside an ns form
21:09	vhquang	thanks mearnsh!
21:10	vhquang	@creese, I can compile the uberjar, but cannot deploy(or run) it
22:52	jjttjj	as a rule, should a clojure library that just wraps an api deal with java dates or are joda time dates acceptible? The dates are coming from strings the api returns
23:03	bbloom	at this point, i consider joda to be "the api the jvm should have had"
23:03	bbloom	it's so widely deployed that you might as well depend on it until the unlikely event that somebody complains
23:09	jjttjj	bbloom: Java dates are a little more conviente to deal with sometimes in clojure like with the built in reader literals, etc, is this not enough of a big deal to make a difference?
23:09	jjttjj	convenient*