#clojure – 2013-04-21

2013-04-21

00:15	murtaza52	I am using emacs with nrepl. I evaluated an expression and it returned an error. How do I get the full stack trace ?
00:15	ivan	(pst)
00:17	murtaza52	ivan: It returned just one line - user> (pst)
00:17	murtaza52	NullPointerException
00:17	murtaza52	nil
00:18	ivan	murtaza52: are you using lein 2.0.0? a newer version fixed https://github.com/technomancy/leiningen/issues/1025
00:22	murtaza52	ivan: yes I am, should I just do lein update
00:22	ivan	I think so
00:23	ivan	lein upgrade
00:54	saint_cypher	st50187
01:09	david_pidcock	jacfr04t
01:51	howdynihao	so can i bring this up, http://benchmarksgame.alioth.debian.org/u32q/benchmark.php?test=all&lang=clojure&lang2=scala&data=u32q ?
01:51	howdynihao	why slower, more memory usage, and shockingly more loc
01:53	bbloom	howdynihao: lines is not how the benchmarks game measures code
01:54	howdynihao	oh ok, well mostly i'm just curious if performance and memory optimizations is a big priority on the roadmap for clojure
01:55	bbloom	the benchmarks game is not indicative of real world performance
01:56	bbloom	most of the problems are numerical in nature, which performs particularly poorly in the face of dynamism
01:56	bbloom	so you wind up with lots of type hints, which drives the code size up, where scala can infer those type hints
02:11	callen	okay, so deploying clojure with gantry is a pleasure.
02:11	callen	all hail the uberjars.
02:11	callen	yogthos: lein ring uberjar is my god.
02:11	yogthos	callen: haha
02:12	yogthos	it's pretty slick :)
02:13	bbloom	i never really understood the appeal of capistrano or fabric... bash always seemed easier AND simpler
02:22	ebaxt	,(clojure.string/replace (pr-str ["foo", "bar"]) " " ", ")
02:22	clojurebot	"[\"foo\", \"bar\"]"
02:23	ebaxt	Is there a better way to print a vector with commas?
02:24	bbloom	not really. what do you need them for?
02:26	ebaxt	I'm creating a script tag on the server side in order for require.js to load a common config object.
02:26	bbloom	use a JSON serializer
02:27	ebaxt	thx, didn't think of that :)
02:30	callen	yogthos: but seriously man, deploying (uber) jars is way easier than deploying a python or ruby app.
02:30	callen	yogthos: I'm not really managing the static assets properly though.
02:30	yogthos	agreed
02:30	callen	yogthos: ended up doing nginx proxy pass to jetty process.
02:30	callen	yogthos: automated the deployment with gantry
02:30	yogthos	that's one way :)
02:30	callen	yogthos: you one of those tomcat pukes?
02:31	yogthos	eh I use glassfish mostly :)
02:31	yogthos	but same thing
02:31	callen	yogthos: wtf, enterprise weirdo.
02:31	yogthos	lol
02:31	callen	yogthos: you look at gantry yet? How do you deploy? Do you automate?
02:31	yogthos	I just don't see the advantage of doing all the stuff by hand that it already handles for you :)
02:31	yogthos	yeah you dump a war in its deploy folder and magic happens
02:32	yogthos	so I just do lein ring uberwar instead :)
02:32	yogthos	also wars avoid the problem of not being writable
02:32	callen	there's nothing "manual" about running a jetty process and proxying it with nginx.
02:32	yogthos	so you don't have to figure out how to handle resources separately
02:32	callen	ohhhh THAT'S why people use wars.
02:32	yogthos	same with gf :)
02:32	yogthos	glassfish is very scriptable
02:33	callen	yogthos: I'm used to having to push static assets into a CDN, so WARs don't mean much to me.
02:33	callen	that makes sense though./
02:34	callen	yogthos: but seriously, how do you automate?
02:34	callen	if I didn't use stuff like fabric or gantry I'd lose my mind.
02:34	yogthos	well at work I've got jenkins going
02:34	callen	for scripting the deploys.
02:34	yogthos	so I just commit and it does the rest
02:34	callen	I have too many projects to use CI for my stuff.
02:34	callen	also I don't write tests for my clojure web apps.
02:34	callen	because I'm a nihilist.
02:34	yogthos	it's kinda neat cause with jenkins you can setup deps between projects
02:34	callen	I do for libraries though.
02:35	yogthos	so if I deploy one it can trigger builds for all the upstream stuff
02:35	yogthos	yeah I don't usually write a lot of tests for apps either
02:35	callen	yogthos: my problem is 0-60 friction. I need to be able to go from idea to "bang" as quickly as possible - not efficiently deploy a complicated SOA.
02:35	yogthos	I like functional tests for sanity mostly if I go refactoring
02:35	callen	also clojure monger needs a korma'ish dialect wrapper.
02:36	callen	yogthos: I would really like a lightweight alternative to webdriver for that.
02:36	yogthos	well with glassfish or even tomcat, you leave that thing running
02:36	yogthos	as soon as you build and dump a war in the deploy it watches that and reloads your app
02:36	callen	sorta how apache wsgi works.
02:36	callen	little less tightly coupled, but similar.
02:37	callen	I prefer lightweight generic stuff like proxy backends.
02:37	yogthos	yeah I played a bit with monger recently
02:37	callen	then I can swap things in and out no matter how they work.
02:37	yogthos	overall it's not bad
02:37	callen	yogthos: well I'm too fucking lazy to use postgres for speculative projects - soooo....
02:37	yogthos	hehe
02:37	callen	yogthos: I'd rather use rethinkdb but they don't have 2i or a clojure driver yet.
02:37	callen	which I keep bugging them about. I may have to wrap their java one.
02:37	callen	which is also alpha quality :\
02:38	yogthos	I'd stick with monger till that matures :P
02:38	callen	yogthos: if you need to do any fabric-esque dev-ops automation/scripted deploys take a look at gantry.
02:38	yogthos	noted
02:38	callen	monger is good, it's clojurewerkz, it's just somewhat low-level.
02:38	callen	also I really don't like the default update/insert semantics, they're fucking dangerous and I have to wrap them in my models.clj
02:38	yogthos	a friend of mine is big on vagrant
02:39	yogthos	I haven't really played with it though
02:39	callen	I don't like stateful VMs.
02:39	callen	well, vagrant is stateful'ish
02:39	callen	vagrant solves a totally different problem from gantry though.
02:39	callen	gantry is for provisioning, deployment, automation, scripting
02:39	callen	vagrant is for dev environments.
02:39	yogthos	gotcha
02:40	callen	yogthos: gantry is, "run this command on this host"
02:40	callen	same as fabric,.
02:40	yogthos	yeah so I guess glassfish sort of does that with its remore scripting
02:41	callen	gantry is more general than that
02:41	callen	it can manage n-hosts doing anything at all.
02:41	yogthos	oh no doubt
02:41	callen	gantry is a component of my "replace heroku" toolchain.
02:41	callen	oh speaking of, I replaced my heroku app. my clojure app had something like 60% uptime with heroku
02:41	callen	used mongohq and digitalocean to replace it.
02:42	yogthos	let me know how you like those guys
02:42	yogthos	they certainly looks fantastic on pricing
02:42	callen	yogthos: I've had some minor issues with DO, but I like them better than Linode for a few reasons
02:42	callen	one biggie is that they handle key propagation for you automatically and have an awesome API.
02:42	callen	DO has an amazing API, it's nicer than fucking EC2.
02:43	callen	you can instantiate machines from images or blank templates very easily.
02:43	yogthos	nice
02:45	callen	demerits of DO are: their network is public, not virtual private like Lindoe
02:45	callen	also, their CPU is somewhat less powerful than Linode. Disk is way faster though.
02:45	yogthos	yeah ssd
02:45	callen	the SSDs tempt one to cheat persistence by having local state on the web workers :P
02:45	yogthos	and you get a nice amount of ram
02:45	callen	yeah that's the biggie really. helps with concurrency per worker.
02:46	callen	DO machines would be ideal for logging or API servers
02:46	callen	less great for CPU intensive workers.
02:46	yogthos	makes sense
02:54	murtaza52	I have a hashmap of data with the key a string description and value an integer weight.
02:54	murtaza52	{:a 1 :b 3 :c 7 :d 2 :e 5}
02:54	murtaza52	I need to transform the hash into a vector of vectors. Each internal vector in turn is a coll of map entries. The constraint being that all the weights in each internal vector should equal to 9.
02:54	murtaza52	[[[:a 1][:c 9]]
02:54	murtaza52	[[:b 3][:d 2] [:e 5]]]
02:54	murtaza52	How do I write a fn to do it ?
02:55	callen	murtaza52: it's just a map, it's not a hashing implementation.
02:55	callen	actually, it is
02:55	callen	I think they're HAMTs
02:56	callen	anyway, they're just called maps (lol)
02:56	bbloom	callen: there are multiple concrete implementations
02:56	callen	bbloom: what is there other than HAMT?
02:56	bbloom	callen: 3 primary implementations: PeristentArrayMap, PersistentHashMap, and PersistentTreeMap
02:57	bbloom	callen: the first is used for small maps, the second used in general, and the last is used for sorted maps
02:57	callen	bbloom: cool, thanks.
02:57	yogthos	,(into [] {:a 1 :b 3 :c 7 :d 2 :e 5})
02:57	clojurebot	[[:a 1] [:c 7] [:b 3] [:d 2] [:e 5]]
02:58	yogthos	murtaza52: is that what you're looking for?
02:58	yogthos	murtaza52: oh nm read the rest
03:19	asalaaak	hi mates
03:20	asalaaak	can someone help me to make a do expression with this: (int (+ ( / (* 3 -774) 3 ) 774 465))
03:25	asalaaak	can someone help me to make a do expression with this: (int (+ ( / (* 3 -774) 3 ) 774 465))
03:28	arcatan	asalaaak: what do you mean by do expression?
03:29	asalaaak	so it prints the numbers and
03:29	asalaaak	gives a println with the answer
04:07	murtaza52	I have a map of data with the key a string description and value an integer weight.
04:07	murtaza52	{:a 1 :b 3 :c 7 :d 2 :e 5}
04:07	murtaza52	I need to transform the hash into a vector of vectors. Each internal vector in turn is a coll of map entries. The constraint being that all the weights in each internal vector should equal to 9.
04:07	murtaza52	[[[:a 1][:c 9]]
04:07	murtaza52	[[:b 3][:d 2] [:e 5]]]
04:07	murtaza52	How do I write a fn to do it ?
04:13	jjido	murtaza52: transforming is easy, applying the constraint is not
04:14	jjido	also 1+9 = 10, not 9
04:48	amalloy	murtaza52: i think your weights problem is NP-hard
05:01	callen	amalloy: knapsack problem ain't it?
05:10	supersym	shoot
05:44	tgoossens	If I understand it correctly. identities/refs pointing to other refs in clojure is just not-done?
05:45	tgoossens	Like in java i had Board object that has a list of player objects
05:46	tgoossens	Because then your refs don't have a "value" anymore
06:11	Ember-	hmm, I wonder how I should bind a compojure route which contains both path parameters and request parameters
06:12	Ember-	it doesn't seem to pass the request parameters
06:12	Ember-	and yes, I have to appropriate middleware in place
06:12	Ember-	to = the
06:12	Morgawr	mm.. what's the difference between ->> and ->? Is it just that ->> adds the item as first in the function and -> adds it as second?
06:13	Ember-	Morgawr: ->> adds as the last parameter, -> as the first
06:13	tgoossens	correct
06:13	Morgawr	alright, thanks :)
06:13	tgoossens	,(-> [1 2 3] (filter even?))
06:13	clojurebot	#<IllegalArgumentException java.lang.IllegalArgumentException: Don't know how to create ISeq from: clojure.core$even_QMARK_>
06:13	tgoossens	,(->> [1 2 3] (filter even?))
06:13	clojurebot	(2)
06:14	Morgawr	,(-> even? (filter [1 2 3]))
06:14	clojurebot	(2)
06:14	Morgawr	great :) I think I got it
06:14	tgoossens	:)
06:16	Ember-	I thought the binding thing I asked above would work like this:
06:17	Ember-	(GET "/foo/:bar" {{bar :bar a :a} :params} (str "Hello" a"))
06:17	Ember-	but unfortunately it doesn't seem to work
06:18	Ember-	should match into /foo/something?a=foo for example
06:18	Ember-	and yes, I typoed that example :)
06:18	Ember-	but you get the picture
06:23	Ember-	oh crap, I think I hit this https://github.com/weavejester/compojure/wiki/Common-Problems
06:23	Ember-	"One example of this is if you had two sets of routes each with wrap-params wrapped around them in the same stack. Only the first routes would have the params."
06:24	Ember-	just tried, bindings work as expected in the first route mapping
06:50	zilti	Is there an actively maintained clojurescript routing library?
07:10	zilti	Is there an actively maintained clojurescript routing library?
07:52	Glenjamin	Ember-: you should be able to do (GET "/foo/:bar" [bar a] (stuff))
07:53	Glenjamin	see https://github.com/weavejester/compojure/wiki/Destructuring-Syntax#compojure-specific-destructuring
07:56	Ember-	yes, I know
07:57	Ember-	was just trying to figure out what's going on
07:57	Glenjamin	ah ok
07:57	Ember-	and thus used the more exact destructuring version for parameter binding
07:57	Ember-	and btw, managed to fix my problem
07:57	Ember-	thanks anyway :)
07:57	Glenjamin	i tend to throw in [:as req] on the end, and then (prn req) for debugging :)
07:58	Ember-	not a bad idea
08:51	murtaza52	what are the scenarios where structs are advantageous over maps?
09:42	amaevis	Hi everyone. I had a question about how ensuring that a service starting or stopping is synchronized so you don't get 2 starting calls processing at once.
09:42	amaevis	http://stackoverflow.com/questions/16131420/canonical-way-to-ensure-only-one-instance-of-a-service-is-running-starting-s
09:42	amaevis	Is there a canonical way to do this in the community? Or better yet, an existing lib?
10:55	Morgawr	I have a question.. I have an atom which contains a hashmap (let's say {:x 0 :y 0}, like a set of coordinates), now I have a collection of symbol + value (like [[:y 4][:y 3][:x 5][:y 3]]) and I want to swap! with assoc on that atom for each key-value pair from that collection
10:55	Morgawr	what would be the best way to do so?
10:56	Morgawr	so far I have a simple function which is a wrapper around swap! (with better syntax imo) which works like this:
10:56	Morgawr	(defn remap-state [state sym value] (swap! state #(assoc % sym value)))
10:56	Morgawr	I want to call "remap-state" on the atom and the collection, I was thinking about using a map but it doesn't seem to be working properly
11:00	IamDrowsy	what about making a map out of the collection (with into {}) and merge them (instead of assoc)?
11:00	Morgawr	can you provide an example? I'm still a newbie with clojure so I'm not familiar with all the functions
11:02	IamDrowsy	mh... wait.. do you need every state in between? in your example your atom would look like this {:x 5 :y 3} in the end..
11:02	IamDrowsy	do you need the state {:x 5 :y 4} for reactions?
11:03	Morgawr	I just need the last state
11:03	Morgawr	the resulting one after all the swap!
11:04	IamDrowsy	so you can just produce the last state without swaping with:
11:04	IamDrowsy	,(into {} [[:y 4] [:y 3] [:x 5] [:y 3])
11:04	clojurebot	#<RuntimeException java.lang.RuntimeException: Unmatched delimiter: )>
11:04	IamDrowsy	,(into {} [[:y 4] [:y 3] [:x 5] [:y 3]])
11:04	clojurebot	{:y 3, :x 5}
11:05	IamDrowsy	and merge the old state and the new values
11:05	Morgawr	with assoc?
11:05	IamDrowsy	no with merge
11:05	IamDrowsy	,(doc merge)
11:05	clojurebot	"([& maps]); Returns a map that consists of the rest of the maps conj-ed onto the first. If a key occurs in more than one map, the mapping from the latter (left-to-right) will be the mapping in the result."
11:06	Morgawr	ah derp, great!
11:06	Morgawr	that's exactly what I needed, thanks a lot IamDrowsy
11:06	IamDrowsy	np :)
11:37	TimMc	murtaza52: Structs are deprecated -- use maps or records instead.
11:37	TimMc	murtaza52: http://cemerick.com/2011/07/05/flowchart-for-choosing-the-right-clojure-type-definition-form/
11:53	murtaza52	TimMc: thanks for the link!
12:08	mye	I'm looking for a function that produces an #inst (rfc3339) timestamp that works in clojure and clojurescript.
12:09	mye	anyone had this problem before? Could I make a macro that expands differently in clojure and clojurescript?
12:13	asalaaak	(defn myfun [x y & others] (println (int (* x y))) (println "others: " others)))
12:14	asalaaak	hey mates i want to
12:14	asalaaak	get the sum of the others
12:14	asalaaak	but cant get it work
12:14	asalaaak	can someone help me please
12:14	asalaaak	(defn myfun [x y & others]
12:14	asalaaak	(println (int (* x y)))
12:14	asalaaak	(println "others: " others)))
12:14	asalaaak	i have this
12:15	IamDrowsy	,(reduce + [1 2 3 4 5 6])
12:15	clojurebot	21
12:16	IamDrowsy	oh
12:16	IamDrowsy	or
12:16	IamDrowsy	,(apply + [1 2 3 4 5 6 ])
12:16	clojurebot	21
12:17	asalaaak	youre amazing mate
12:17	asalaaak	thank you very much
12:25	klrr	HAI!
12:55	bttf	does anyone have experience using sqlKorma in here
12:59	bttf	im having issues.. https://gist.github.com/bttf/a80a95289d5ed8dcd889
13:23	mynomoto	bttf: It's saying that the db is encripted or not a db. Did you create the db with a password?
13:27	bttf	mynomoto: i saw that but unless sqlite encrypts by default its not encrypted or passworded or anything
13:28	bttf	i did a sqlite dal.db and did some creates and some inserts, thats it
13:39	bttf	if anyone could help that would make my day
14:00	mynomoto	bttf: I tried to replicate what you did but got other errors. If I were you I would try h2 instead of sqlite.
14:01	bttf	oh .. okay ill check it out, thanks
14:28	Okasu	bttf: Yeah, h2 works just fine with korma, one quirk you need to know though.
14:29	Okasu	You need to upcase tablenames with h2 and korma otherwise you'll fail at select.
14:33	Okasu	https://github.com/mynomoto/sqlkorma/commit/f24f917901adea0e7992f51fcdc06eca4ba30b92 Heh, it's already included in docs.
14:40	gfredericks	,'$17.99
14:41	clojurebot	$17.99
14:41	gfredericks	^ a macro that takes advantage of that would be kind of sweet
14:42	gfredericks	(with-dollaric-literals ...)
14:42	tgoossens	,'€20
14:42	clojurebot	?20
14:42	tgoossens	;(
14:45	mynomoto	Okasu: Yeah, but maybe should be the default in the h2 helper. It's not clear in the docs that things will go wrong if you don't set :fields upper-case.
14:47	noncom_	hi i have two questions
14:48	noncom_	1) when running a project with 'lein', not all printlns print to the console, how to fix this?
14:48	gfredericks	lein trampoline might help
14:49	gfredericks	I think it normally works fine for me though :/
14:49	gfredericks	so it might well be something weirder
14:49	noncom_	specifically, only printlns on the highest levels printlns (probably during assembling) but anything that is in-app ,it does not print...
14:51	noncom_	i try trampoline now, wait
14:51	gfredericks	I'm doubting that will work based on your subsequent details
14:51	gfredericks	but may as well try I guess
14:51	gfredericks	it might be that some library you're using is changing out?
14:51	noncom_	oh, i use lein ring server to run the app
14:52	noncom_	idk if it hanges out but it used to be ok some time before
14:52	gfredericks	you could debug by replacing one of the printlns with (.println System/out ...)
14:52	gfredericks	if that works fine then you know the issue is out and can try to figure out how that gets changed
14:53	gfredericks	maybe some piece of middleware you're using? though I'm not familiar with any such thing
14:53	gfredericks	I can hypothetically imagine middleware that diverts out to the logfile for some reason
14:55	ucb_home	evening
14:56	noncom_	looks like no such middleware... ok i tried what you said, i wrote (.println System/out " SYS OUT!! ") and it says "java.lang.IllegalArgumentException: No matching method found: println for class java.io.PrintStream"
14:56	ucb_home	I'm having trouble checking whether an item in a list is an instance of clojure.lang.Fn (inside a macro). https://gist.github.com/5430614
14:56	ucb_home	if anybody could point out where I'm going wrong that'd be great.
14:58	noncom_	this is weird, no?
14:59	ordnungswidrig	ucb_home: what about (fn? form)
14:59	amalloy	ucb_home: the macro will never receive a Fn: it gets source-code forms, which you typed in
14:59	ordnungswidrig	amalloy: you're right
14:59	ucb_home	amalloy: yeah, so I toyed with resolve but still didn't manage to get anywhere
15:00	ordnungswidrig	ucb_home: what it your intended use case?
15:00	ucb_home	amalloy: but then that gives me a var
15:00	ordnungswidrig	ucb_home: you could inspect the var. But can you give an example how you would like to use the macro?
15:01	noncom_	but in eclipse it prints to the console (not to the repl)
15:01	ucb_home	ordnungswidrig: hrmph, I'd need a bit of context, but basically this is the intended output. for (p-source (inc 1)) I'd want (each inc (1)) and for (p-source '(1 2 3)) I'd want (map immediately '(1 2 3))
15:02	ucb_home	ordnungswidrig: I thought about inspecting the var; the point of this macro is to emit different code depending on whether the first item in the form is a function or a value.
15:02	ucb_home	ordnungswidrig: (each ...) is a function similar to pmap btw
15:02	ordnungswidrig	ucb_home: why not (p-source #(inc 1)) vs. (p-source [1 2 3]))
15:03	ordnungswidrig	ucb_home: i.e. pass a function as a function and pass a value as a value
15:03	noncom_	,(.println System/out)
15:03	clojurebot	nil
15:03	ucb_home	ordnungswidrig: good question. I probably need to rethink this through anyway :/
15:04	ucb_home	I also now realise that checking for Fn is not ideal since most data structures also implement Fn; and keywords too
15:04	ordnungswidrig	ucb_home: I think you have one level of abstract to much :)
15:04	ordnungswidrig	ucb_home: you can also define a wrapper type that hold the fn and check for that.
15:04	ucb_home	ordnungswidrig: yeah, possibly :/
15:05	ucb_home	in more general terms, do you guys feel that a version of -> and ->> that did multi-threading behind the scenes would be useful?
15:05	noncom_	,(.println System/out "test")
15:05	clojurebot	nil
15:05	ucb_home	is there such a thing already and I'm trying to re-invent the wheel?
15:05	noncom_	at least it gives no exception
15:09	gfredericks	noncom_: that's really weird because the PrintStream class definitely has a println method
15:09	ordnungswidrig	ucb_home: how should multithreading with -> work? Every step depends on the output of the prvious one?
15:09	gfredericks	noncom_: you're not somehow passing zero or two or more arguments?
15:10	gfredericks	ucb_home: have you seen the parallelized threading macros in the swiss-arrows library?
15:10	ucb_home	ordnungswidrig: that's precisely what I'm trying to define and work on. I have a tiny proof of concept here https://github.com/ulises/gok/ which is probably wrong, incomplete and useless. It uses futures and promises. The way it works is by imposing some sort of structure to the flow.
15:10	ucb_home	gfredericks: I have not!
15:10	gfredericks	ucb_home: now you will have!
15:10	ucb_home	gfredericks: checking. Thanks!
15:13	noncom_	gfredericks: you're right, in the app i was passing 2 args. well, i tried that, and it's the same - it prints to eclipse console, but not the CMD when run with 'lein ring server'
15:14	gfredericks	noncom_: if you're using eclipse then I have no idea what arbitrarily weird things might be going on
15:14	ucb_home	oh, I see, the parallel versions are using futures too. That's encouraging at least.
15:14	gfredericks	running with `lein ring server` means not using eclipse at all?
15:14	noncom_	yes
15:14	jjttjj	i have a vector of maps, and a seperate vector of values that correspond to those maps that i need to merge together, is there a better way to do that then (map #(conj %1 [:extra-value %2]) my-maps extra-values)
15:14	jjttjj
15:15	jjttjj	bigger example here: https://www.refheap.com/paste/13814
15:15	noncom_	eclipse does nothing extra to the project
15:15	gfredericks	jjttjj: well assoc is a little cleaner than conj there
15:15	noncom_	lein sould just work as it worked but it doesn't (
15:15	noncom_	ehhh..
15:15	gfredericks	jjttjj: but I can't imagine a more succinct version besides that
15:16	jjttjj	gfredericks: cool, thanks!
15:19	ucb_home	thanks for the comments; cheers now.
15:28	arrdem	if I only partially extend a protocol onto a type does it not default to the java.lang.Object impl? what I'm seeing in the repl suggests it doesn't.
15:33	gfredericks	yeah I believe it crashes
15:33	gfredericks	on calling a missing function
15:33	arrdem	looks like if you extend it to nil you can hack around it..
15:34	gfredericks	O_O
15:34	arrdem	lol
15:34	gfredericks	you're saying if a type has only some of the functions in the protocol implemented, for the other ones it will call the implementation for nil?
15:35	arrdem	no no
15:35	arrdem	in my specific case the nil implementation matters
15:35	arrdem	because I recur onto the meta map of an object if all else fails
15:35	arrdem	so my error was that I didn't handle a nil meta map
15:36	arrdem	Clojure was "doing the right thing" and calling Object it looks like
15:40	luisgabriel	hi, can someone give me a clue about why I'm getting a really bad performance with this code https://gist.github.com/luisgabriel/5430769 ? The function process-content returns an occurrence list (word/positions pairs) of a given text
15:43	octagon	hello, where can i find up-to-date docs about the clojure reader? http://clojure.org/reader appears to be incorrect.
15:45	ordnungswidrig	luisgabriel: is-valid split the string into a sequence. I suppose this makes it slow. Using a regex to filter the string for valid characters should be slower.
15:45	ordnungswidrig	luisgabriel: ah, faster, I mean.
15:46	arrdem	octagon: what's wrong with the official page on the reader?
15:46	octagon	arrdem: "Symbols: Symbols begin with a non-numeric character and can contain alphanumeric characters and *, +, !, -, _, and ? (other characters will be allowed eventually, but not all macro characters have been determined). ..."
15:47	octagon	arrdem: consider: (defn clj->js ...)
15:48	luisgabriel	ordnungswidrig: hmm, I'll try to use a regex. thanks
15:48	octagon	arrdem: bizarrely, the javadoc for java.util.regex.Pattern states that \w is [a-zA-Z_0-9], but matches characters such as '/' or '>'
15:49	arrdem	octagon: while the reader will take -> as a valid symbol (see clojure.core/->) my point is just that the official docs at clojure.org are the best you're gonna get short of reading the code on github.
15:50	arrdem	clojure-doc.org is intended to be a high level overview of the Clojure ecosystem (I believe)
15:50	arrdem	and clojuredocs.org is out of date
15:51	amalloy	&(re-find #"\w" "/")
15:51	lazybot	⇒ nil
15:51	octagon	arrdem: php.net lets users add comments, which is how they keep their docs up to date. just sayin
15:51	amalloy	octagon: so no, of course \w matches exactly what the javadoc says it matches
15:51	ordnungswidrig	octagon: that's a scaring feature :-)
15:52	arrdem	octagon: php.net also has some of the most evil snippets I've ever seen in the comments. just sayin
15:53	arrdem	octagon: all trolling asside you're right, the main page should list < and > as valid symbol characters
15:53	arrdem	also & I think..
15:53	arrdem	,'&foo
15:53	clojurebot	&foo
15:53	octagon	arrdem: the reason is i'm working on writing an editor that needs to be able to parse at a lower level than the clojure reader
15:54	octagon	arrdem: because the clojure reader doesn't preserve all the information in the source file
15:54	octagon	arrdem: like #_(...) for example, or some things can't be reverse-engineered, like syntax-quoted things
15:55	tgoossens	how would you model the following in clojure? In java for example i can have a class that has a field 'friend' which references to another Person object". ? because if i follow the idea of the "value" of an "identity". Then in clojure refs that refers to other refs make no sense
15:56	noncom_	all is fine. i fixed it
15:56	xeqi	octagon: have you seen sjacket?
15:56	noncom_	turned out that another account on the computer had an app running on the same port, and ring simply sat there silently without reporting anything and looking as if it runs the server, but it did not since the port was occupied already
15:57	gfredericks	tgoossens: you can use IDs if that makes sense for what you're doing
15:57	gfredericks	or nested objects?
15:57	gfredericks	I guess for friends IDs make more sense
15:57	tgoossens	but (now i'm coming from an oo point of view)
15:57	tgoossens	isn't it a bit silly that i have to
15:57	tgoossens	1) define an ID
15:57	tgoossens	2) have an identity
15:58	gfredericks	what does 'have an identity' mean?
15:58	tgoossens	that it can be uniquely identified even if the value would be the same
15:58	gfredericks	maybe you should describe what you're doing at a higher level
15:58	tgoossens	,(= (ref 1) (ref 1))
15:58	clojurebot	false
15:59	gfredericks	doesn't giving everything an :id accomplish "having an identity"?
15:59	gfredericks	if :id is part of the value then it can't be equal to anything else
15:59	tgoossens	Yes. But then you want to have it shared between threads
16:00	gfredericks	how are multiple threads using these objects?
16:00	octagon	xeqi: we looked at sjacket a while ago, but i don't remember why it didn't do what we needed
16:00	tgoossens	*it might be shared
16:01	tgoossens	i'm just wondering btw not making an actual application at the moment
16:01	octagon	xeqi: does sjacket preserve all the info in the source? like when you have a number literal, if it's in hex or whatever
16:03	xeqi	octagon: I'm not sure, I just know its used as part of reply for figuring out when to send a complete expression to the server. I'd been hearing decent things about it
16:06	gfredericks	tgoossens: yeah abstract questions make it harder to figure out where our disconnect is. I think people tend to treat the data as values, as if it came from a database. In a database, you have :id keys and foreign keys and it's not a big issue
16:07	gfredericks	I do multithreaded stuff all the time and I've never even needed refs, so it's probably the case that whatever you're worried about isn't likely to come up in practice
16:12	tgoossens	hmmm
16:12	amalloy	i mostly use refs for things where i could use atoms but it's more convenient with refs
16:13	gfredericks	clojure: you come for the refs, but you stay for the data structures
16:13	arrdem	s/datastructures/map literal/g
16:14	gfredericks	or the macros
16:14	gfredericks	you can stay for the macros too
16:17	gfredericks	concurrency support is the bait in clojure's trap to turn people into functional programmers
16:19	arrdem	clojurebot: concurrency is concurrency support is the bait in clojure's trap to turn people into functional programmers
16:19	clojurebot	Ik begrijp
16:19	arrdem	-_-
16:19	arrdem	~cons
16:19	clojurebot	litany against cons is "I must not cons. Cons is the perf-killer. Cons is the little death that brings total obliteration. I will face my cons and permit it to pass over me and through me, and when it has gone past I will turn my GC to see its path. And where it has gone there will be nothing; only I will remain."
16:20	arrdem	clojurebot: foo is bar
16:20	clojurebot	Ack. Ack.
16:21	arrdem	~foo
16:21	clojurebot	foo is bar
16:23	gfredericks	~bar
16:23	clojurebot	bar is foo
16:24	gfredericks	~perf-killer
16:24	clojurebot	It's greek to me.
16:25	arrdem	~concurrency
16:25	clojurebot	concurrency is remeber concurrency
16:25	arrdem	gfredericks: I done f'd
16:25	octagon	~λ
16:25	clojurebot	excusez-moi
16:25	gfredericks	~concurrency
16:25	clojurebot	concurrency is concurrency support is the bait in clojure's trap to turn people into functional programmers
16:26	gfredericks	arrdem: ^
16:26	arrdem	(inc gfredericks) ;; for fixing my mess
16:26	lazybot	⇒ 20
16:26	gfredericks	didn't fix nothing, just showed you it wasn't broken
16:27	arrdem	wait did I misspell it?
16:27	arrdem	gfredericks: what'd I do wrong? I can't tell.
16:29	Okasu	~concurrency
16:29	clojurebot	concurrency is concurrency support is the bait in clojure's trap to turn people into functional programmers
16:29	Okasu	~concurrency
16:29	clojurebot	concurrency is "concurrency support is the bait in clojure's trap to turn people into functional programmers"
16:29	Okasu	~concurrency
16:29	clojurebot	concurrency is concurrency support is the bait in clojure's trap to turn people into functional programmers
16:31	gfredericks	clojurebot: forget concurrency is concurrency support is the bait in clojure's trap to turn people into functional programmers
16:31	clojurebot	Ik begrijp
16:31	gfredericks	clojurebot: concurrency is <reply> concurrency support is the bait in clojure's trap to turn people into functional programmers
16:31	clojurebot	Ack. Ack.
16:31	gfredericks	~concurrency
16:31	clojurebot	concurrency is forget concurrency
16:31	gfredericks	~concurrency
16:31	clojurebot	concurrency support is the bait in clojure's trap to turn people into functional programmers
16:32	hiredman	~botsnack
16:32	clojurebot	botsnack is scoobysnack
16:32	gfredericks	arrdem: is that what you wanted it to do?
16:32	arrdem	gfredericks: heh yeah that's what I was looking for
16:32	arrdem	~botsmack
16:32	clojurebot	clojurebot evades successfully!
16:35	xeqi	~botstack
16:35	clojurebot	/me puts lazybot on his head and gropes blindly for a third bot to complete the stack.
16:36	arrdem	one day I will write a third bot and the botstack will be complete
16:42	Morgawr	hello, I have a collection (a hashmap) of key-values, I need to iterate over each pair and apply a function with side-effects. What's the best way to do this? At the moment I am using a map and forcing it to evaluate.. is there an appropriate construct for this case? I do not care about the returned value
16:43	xeqi	&(doseq [[k v] {:x 1 :y 2}] (println k v))
16:43	lazybot	⇒ :y 2 :x 1 nil
16:43	arrdem	xeqi: STOP BEATING ME TO THE PUNCH
16:44	Morgawr	xeqi: great, thanks!
16:46	tyler_	is there a function that given a value and quantity, returns a vector with n elments of value v ?
16:46	arrdem	tyler_: (repeat)
16:46	arrdem	,(repeat 3 3)
16:46	clojurebot	(3 3 3)
16:46	tyler_	(inc arrdem)
16:46	lazybot	⇒ 3
16:47	tyler_	ta
16:47	xeqi	noooooo! I just looked away for a moment
16:47	arrdem	(inc xeqi) ;; the other guy missed you
16:47	lazybot	⇒ 8
16:48	tyler_	um one question though, why is inc side affecting? ;)
16:49	octagon	(inc tyler_)
16:49	lazybot	⇒ 1
16:50	arrdem	tyler_: we've had the inc! argument a few times and we've just never patched the bot XP
16:51	tyler_	why not (swap! tyler_ inc)
16:52	octagon	(dec octagon)
16:52	lazybot	You can't adjust your own karma.
16:52	rasmusto	tpope: ping
16:52	arrdem	(defmacro inc! [username] (update-in lazybot [:karma username] inc))
16:53	tyler_	woo i need to read docs on update-in i don't really grok that yet
16:59	rasmusto	tyler_: you give it a vector of keys into a nested hash-map, and a function that you want to use on the element that the keys get you to, and it updates it
16:59	ivan	is there a min-range somewhere that I should use instead of (range n Double/POSITIVE_INFINITY)?
16:59	amalloy	ivan: (iterate inc n)
16:59	ivan	ah, thanks
17:00	arrdem	amalloy: ooh nice one
17:00	tyler_	(inc amalloy)
17:00	lazybot	⇒ 51
17:00	gfredericks	though not chunked so maybe slower
17:00	tyler_	heh chunky is faster
17:02	gfredericks	,(let [a (atom 0)] (second (map (fn [_] (swap! a inc)) (range 50))) @a)
17:02	clojurebot	32
17:02	jasonjck_	hm I thought all clj seq related functions were chunked
17:02	jasonjck_	that's confusing
17:02	gfredericks	,(let [a (atom 0)] (second (map (fn [_] (swap! a inc)) (filter identity (range 50)))) @a)
17:02	clojurebot	32
17:17	n_b	Futures work off the unbounded thread pool, right?
17:17	n_b	s/the/an
17:24	arrdem	technomancy: if I use (slurp "VERSION") in my project.clj will lein deal?
17:33	technomancy	arrdem: one way to find out
17:34	arrdem	technomancy: doing so now :p
17:34	arrdem	technomancy: lein died in a fire
17:35	technomancy	oh no
17:35	ivan	can I disable buffering on a FileWriter without subclassing it? does this already exist somewhere?
17:35	technomancy	arrdem: inside or outside defproject?
17:36	arrdem	technomancy: my b
17:36	arrdem	there was another syntax error, it wasn't my slurp
17:40	arrdem	(apply str (replace {\newline ""} (slurp "VERSION"))) seems to be working
18:11	tyler_	do many people move to north carolina from the bay area because of the clojure community?
18:11	tyler_	ive contemplated it
18:17	ivan	gen-class or java source are the only things that will let me call the superclass, right?
19:41	ivan	&(max '(1 2 3))
19:41	lazybot	⇒ (1 2 3)
19:43	gfredericks	&(max 1 2 3)
19:43	lazybot	⇒ 3
19:43	ivan	&(max '(1 2 3) '(1 2 4))
19:43	lazybot	java.lang.ClassCastException: clojure.lang.PersistentList cannot be cast to java.lang.Number
19:44	gfredericks	&(apply max (concat '(1 2 3) '(1 2 4)))
19:44	lazybot	⇒ 4
20:15	hyPiRion	,(reduce max (map (partial reduce max) ['(1 2 3) '(1 2 4)]))
20:15	clojurebot	4
20:59	yedi	how can i get lein beanstalk to ignore files or folders
21:32	capcrunch	anyone uses clj-native ?
22:39	stian_	Total newbie question: given two lists of file names and access times, and wanting to compare to see which files have changed, what is the best data structure to store it (set of sets? hash?) and what is the idiomatic Clojure way of finding the filenames of the files that have changed (i.e. where time1 is not like time2)? Thanks!
22:44	xeqi	stian_: sounds like you have two maps (from filename to access time). Then for each file in the list compare the values
22:45	bbloom	unless the question is how to do that efficiently, and then it's a different question
22:52	stian_	xeqi: yes exactly… how do you compare the two? (as I said, I'm really a newbie). In Ruby I would use a.each {\|x, y\| if oldval[x] != y} etc, but I want to write idiomatic code. list comprehension with for, or map, or merge and distinct, or ?
22:58	xeqi	&(let [m1 {:x 1 :y 2} m2 {:x 2 :y 2}] (remove #(= (m1 %) (m2 %)) (keys m1)))
22:58	lazybot	⇒ (:x)
22:58	xeqi	assuming the keys are the same
23:41	nicholas	eix
23:43	cnsnnts	exit