#clojure – 2015-11-05

2015-11-05

00:03	gfredericks	maybe that will help me sleep extra effectively
00:04	gfredericks	goodnight internet
00:04	rhg135	Night
00:04	justin_smith	(Human/sleep (* 8 60 60 1000))
02:15	owlbird	WARNING: get already refers to: #'clojure.core/get in namespace:
02:15	owlbird	(:require [console.app :as app])
02:16	owlbird	(app/get "xx") is still conflict with clojure.core/get, how to fix that?
02:16	opqdonut	it shouldn't
02:16	opqdonut	perhaps you're also use'ing console.app?
02:18	owlbird	after 'lein ring server', api works fine, server only shows a warning message
03:05	owlbird	how to call a 'get' func of current ns, not clojure.core/get ?
03:07	TEttinger	,(defn get [coll k] "hey guys!")
03:07	clojurebot	#error {\n :cause "denied"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.SecurityException: denied, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyzeSeq "Compiler.java" 6891]}\n {:type java.lang.SecurityException\n :message "denied"\n :at [clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]}]\n :trace\n [[clojureb...
03:07	owlbird	I (defn get [code] ...) and call is like (if (get code) ...), but it failed
03:07	owlbird	ArityException Wrong number of args (1) passed to: core/get
03:08	TEttinger	you can call it with your current ns
03:08	owlbird	it seems called clojure.core/get, not my 'get'
03:08	TEttinger	,ns
03:08	clojurebot	#object[clojure.lang.Namespace 0x7b36f42a "sandbox"]
03:08	TEttinger	,(defn reductions [f coll] "hey guys!")
03:08	clojurebot	#error {\n :cause "denied"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.SecurityException: denied, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyzeSeq "Compiler.java" 6891]}\n {:type java.lang.SecurityException\n :message "denied"\n :at [clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]}]\n :trace\n [[clojureb...
03:08	TEttinger	sigh
03:09	TEttinger	I don't know what it denies, but I guess "everything"
03:09	TEttinger	hm
03:09	TEttinger	that core/get
03:09	TEttinger	that doesn't sound like clojure.core/get
03:09	TEttinger	,(get {})
03:09	clojurebot	#error {\n :cause "Wrong number of args (1) passed to: core/get"\n :via\n [{:type clojure.lang.ArityException\n :message "Wrong number of args (1) passed to: core/get"\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$eval91 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval91 invo...
03:09	TEttinger	nvm
03:10	TEttinger	but you can call it with your own ns
03:10	TEttinger	(my.namespace.core/get {})
03:11	owlbird	that's too long, i mean, is there some namespace indicator? like :: in c or dot in python?
03:12	TEttinger	what is your ns here?
03:12	TEttinger	you can also alias an ns
03:12	TEttinger	or alias your get fn
03:12	TEttinger	,(alias get2 get)
03:12	clojurebot	#error {\n :cause "Unable to resolve symbol: get2 in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: get2 in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: get2 in this co...
03:12	TEttinger	,(doc alias)
03:12	clojurebot	"([alias namespace-sym]); Add an alias in the current namespace to another namespace. Arguments are two symbols: the alias to be used, and the symbolic name of the target namespace. Use :as in the ns macro in preference to calling this directly."
03:13	TEttinger	what am I thinking of...
03:13	owlbird	OK I know why
03:13	TEttinger	also, why does it need to be called get?
03:13	owlbird	I'm using ac-cider in emacs, and ns is user>
03:13	TEttinger	user/get ?
03:15	TEttinger	,(alias cs clojure.string)
03:15	clojurebot	#error {\n :cause "Unable to resolve symbol: cs in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: cs in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: cs in this context"...
03:15	TEttinger	,(alias 'cs 'clojure.string)
03:15	clojurebot	nil
03:15	owlbird	when I call a function, which then call 'get', it failed
03:15	TEttinger	,(cs/join " " [:hey :people])
03:15	clojurebot	":hey :people"
03:15	owlbird	ac-cider's default ns is user
03:15	TEttinger	your ns should never be clojure.core I Think
03:16	TEttinger	that
03:16	TEttinger	that's used for the clojure language
03:16	owlbird	en, that's right
03:17	owlbird	then, it's ignoring to switch ns, if I want to test a function in repl after executing C-c C-c in emacs
03:24	adamz	Hi. Im using a clojure application (Riemann) and it defines an internal variable as `defonce`. I was wondering it it was possible to redefine a `defonce` variable, as odd as that sounds?
03:27	kungi	adamz: As far as I know you can only redefine vars with the ^:dynamic metadata.
03:27	adamz	darn
03:31	schaueho	kungi: not true
03:31	kungi	schaueho: Ok? Enlighten me?
03:31	schaueho	you can only rebind vars that have ^:dynamic
03:31	schaueho	also, calling defonce twice will not lead to a re-definition
03:32	schaueho	but you can, of course, call def again
03:32	schaueho	,(defonce onceonly 123)
03:32	clojurebot	#'sandbox/onceonly
03:32	schaueho	,onceonly
03:32	clojurebot	123
03:32	schaueho	,(def onceonly 125)
03:32	clojurebot	#'sandbox/onceonly
03:32	schaueho	,onceonly
03:32	clojurebot	125
03:33	adamz	interesting…
03:33	adamz	i went looking for crazy solutions and it might be really simple
03:34	schaueho	all the caveats of http://http://clojure.org/special_forms#def apply, though
03:39	adamz	thanks, that worked
05:14	jonathanj	i'm having some trouble figuring out bidi route parameters in conjunction with liberator parameterized resources
05:17	tdammers	question here; is there a difference in how dynamic variable binding works in the context of deftype vs. defrecord?
05:18	tdammers	because I have this codebase here where it seems like a dynamic variable binding is resolved at definition time for a defrecord, but at method call time for a deftype
05:21	jonathanj	i have a bidi route something like: ["/foo/" {[:id] my-resource}]
05:22	jonathanj	and a liberator resource defined like: (defresource foo [x] ...)
05:22	jonathanj	but trying to access /foo/1234 in my browser results in an error i don't understand: java.lang.ClassCastException: documint.handler$session_resource$fn__10377 cannot be cast to clojure.lang.Associative
05:26	tdammers	wait, nm
05:27	tdammers	the binding is resolved at call time for both
05:27	tdammers	is there a way to have it happen when the constructor is called instead, without explicitly passing it to the constructor?
05:29	amalloy	no
05:30	tdammers	dayum
05:30	tdammers	can I have optional constructor args?
05:39	mpenet	for records kinda using map->Foo, and types just pass nil and wrap this in a function to hide the ugly
05:40	mpenet	I mean use a function wrapper to handle this stuff
05:41	jonathanj	oh... my bidi handler has to be something like: (fn [req] ((foo (get-in req [:params :something])) req))
05:42	jonathanj	i don't know if there is a better way of writing that, but it's kind of ugly
05:43	tdammers	mpenet: yeah, that's what I'm setting out to do now
05:43	tdammers	mpenet: having some trouble wrapping it in a macro though
05:44	tdammers	I want to generate something like `(fn [& args] (apply new ~class-name my-dyn-var args))
05:45	tdammers	but new isn't a fn, so I can't apply it, can I
05:50	mpenet	why a macro?
05:51	mpenet	just use a fn
05:54	tdammers	I want a macro that I can use instead of deftype
05:55	tdammers	so that I don't have to write the boilerplate for 16 types by hand
05:55	tdammers	that macro is supposed to do two things: one, pass everything to deftype to generate the type, and two, generate the fn that does the "capture dynamic var and pass it implicitly as the first arg"
06:00	mpenet	then you don't need apply in your macro template, you can just have the macro generate the proper (new ... ) call for you
06:02	tdammers	then the macro needs to know the arity of the constructor
06:03	tdammers	but nevermind, I found a solution
06:03	tdammers	I just use the ->TypeName factory fn that deftype generates
06:05	mpenet	if you generate the deftype with the macro you know the arity :], but good that you found an alternative, it sounded hairy
06:05	tdammers	hehe, no, I don't know the arity - the entire macro is (defmacro defnode [class-name & args] )
06:06	tdammers	and I just pass args to deftype unchanged
06:06	tdammers	I could, like, inspect the first element of args, count its elements, and generate a suitable (new), but this is much easier
06:37	Glenjamin	are there any libraries which provide higher-level assertions than (is) ? Someone on our team was asking if there's an AsserJ equivalent
06:38	Glenjamin	their example was having (is (= 2 (count some-vec))) showing the vector contents if the count is wrong
06:43	noncom	Glenjamin: haven't seen anything like that, but i too would like to know if that exists...
06:44	noncom	however, if it doesn't, there won't be a big problem implementing it....
06:44	noncom	an interesting approach would be to use core logic for that, although i still could not verify that it is stabile enough for production
07:48	rhall`	/who #clojure
08:00	dnolen	Glenjamin: test.check does stuff like that
08:01	Glenjamin	dnolen: oh, good point
08:01	Glenjamin	wait, hang on - it'll show you inputs
08:01	Glenjamin	but not derived outputs in assertions?
08:01	dnolen	it will show you the minimal failing value for your test (= count 2)
08:02	Glenjamin	eg (= 1 (count (function-under-test input))) ; if that fails, i won't be shown the value of (function-under-test input)
08:02	Glenjamin	but i can still call it myself once i know the input, outside the test
08:02	dnolen	ah the return value no it won't
08:13	jonathanj	why would i choose to use core.async over something like Manifold deferreds?
08:14	jonathanj	the common "call f with the value when it arrives" case seems to be a lot more boilerplatey with core.async
08:18	jonathanj	am i right in saying that the spelling of "call f with the value when it arrives" in core.async is (go (while true (let [[v ch] (alts! [c1])] (f v))))?
08:21	stain	what about (async/map f c1) ?
08:42	mpenet	in both libs there are many ways to do this
08:42	mpenet	ex: (go-loop [] (f (<! ch)))
08:43	mpenet	manifolds seems to have more "knobs" (ex: with the use of the underlying thread)
08:44	jonathanj	how do you construct a processing pipeline with core.async?
08:44	jonathanj	like, to build up several functions that process the result sequentially
08:45	jonathanj	this seems like a really long way of going about it: http://www.braveclojure.com/core-async/#Escape_Callback_Hell_with_Process_Pipelines
08:46	mpenet	you can use transducers to do this
08:49	jonathanj	so how would you write that example with transducers?
08:50	jonathanj	it's not clear to me how you turn clojure.string/upper-case into a transducer
08:50	mpenet	(map clojure.string/upper-case)
08:51	mpenet	you can then pass it to the chan constructor directly or via other c.c.async function ex pipeline if you want it connected to another chan
08:53	jonathanj	so in that example the xform is (comp (map s/upper-case) (map s/reverse))
08:54	jonathanj	but what is the reducing function?
08:54	jonathanj	maybe i don't want to call (transduce)
08:55	jonathanj	maybe (sequence xform [...])?
08:55	mpenet	you don't have to
08:55	mpenet	this is the signature of `chan` for instance ([] [buf-or-n] [buf-or-n xform] [buf-or-n xform ex-handler])
08:56	mpenet	you can create a chan that will transform it's input as you feed to it
08:56	mpenet	or as I said connect it to another chan and have the transformation done when msgs move from one to antoher
08:56	mpenet	via pipeline
08:58	jonathanj	do i just pass nil for any of those parameters i don't want to specify?
08:58	jonathanj	like if i wanted to pass ex-handler without xform or buf-or-n
08:58	mpenet	ex: (def c (clojure.core.async/chan 1 (map clojure.string/lower-case)))
08:59	mpenet	try without the buff-size but I think it will throw
09:03	jonathanj	okay, so buf-or-n must be supplied if you have a transducer, but you can pass only ex-handler by filling the others with nil
09:05	mpenet	then this example is with map, but you can fold over values, filter, etc...
09:08	jonathanj	this still doesn't really help me understand why to choose core.async over manifold
09:08	jonathanj	or vice versa
10:06	jjttjj	anyone know if there are any idioms for working with arithmatic with NAs in incanter, similar to how it's done in R? specifically, i want to add multiple columns of a dataset, where some will start later than others but are backfilled with NAs (nils?), and i want the result to have NAs/nils in these spots. Seems like this should be a fairly common problem but I can't really find a "standard" way to do it? should i just wrap the inc
10:32	jonathanj	is there a comprehensive core.async guide that goes through some of the more obscure parts? like (mix) etc.
10:40	jonathanj	http://martintrojer.github.io/clojure/2014/03/09/working-with-coreasync-chaining-go-blocks/ :(
11:08	sdegutis	How do you sort by two things? Like, if you wanted to sort [[1 2] [2 1] [3 3] [2 3] [3 2]] by first and then second, so you would get [[1 2] [2 1] [2 3] [3 2] [3 3]]?
11:09	llasram	sdegutis: yes. be warned though of the surprising-to-me behavior that Clojure vectors sort first by length, then by successive elements
11:09	justin_smith	sdegutis: sort
11:09	justin_smith	,(sort [[1 2] [2 1] [3 3] [2 3] [3 2]])
11:10	clojurebot	([1 2] [2 1] [2 3] [3 2] [3 3])
11:10	justin_smith	llasram: or sort-by #(take 2 %) - good point
11:10	sdegutis	No but I mean technically I'm sorting by :queued-email/date and then queued-email/priority.
11:10	sdegutis	So that's what confuses me beyond reason.
11:10	sdegutis	That's what `first` and `second` represent here.
11:11	sdegutis	But f/s are easier to experiment with in samples.
11:11	justin_smith	sdegutis: (sort-by (juxt :queued-email/date :queued-email/priority) mails)
11:11	cichli	(sort-by (juxt :queued-email/date :queued-email/priority) coll))?
11:11	sdegutis	s/s/ex/g
11:11	sdegutis	justin_smith: is that even right? will it truly work?
11:11	justin_smith	sdegutis: yes
11:11	sdegutis	,(sort-by (juxt first second) [[1 2] [2 1] [3 3] [2 3] [3 2]])
11:11	clojurebot	([1 2] [2 1] [2 3] [3 2] [3 3])
11:12	sdegutis	,(sort-by (juxt second first) [[1 2] [2 1] [3 3] [2 3] [3 2]])
11:12	clojurebot	([2 1] [1 2] [3 2] [2 3] [3 3])
11:12	sdegutis	Now I'm confusing myself by mixing sort with sort-by.
11:12	justin_smith	,(sort-by (juxt :a :b) [{} {:a 0 :b 1} {:b 3} {:a 12 :b 1}])
11:12	clojurebot	({} {:b 3} {:a 0, :b 1} {:a 12, :b 1})
11:12	sdegutis	Great.
11:12	justin_smith	sdegutis: those results were all correct
11:12	sdegutis	Thanks justin_smith.
11:12	sdegutis	You're rock.
11:12	justin_smith	haha, I try
11:15	sdegutis	Oh I see justin_smith.
11:15	sdegutis	Juxt forces it to take advantage of how sort automatically sorts seqs in order with respect to all elements from left to right.
11:15	justin_smith	exactly
11:15	clojurebot	excusez-moi
11:15	sdegutis	(IF THERE EVEN IS SUCH A THING AS LEFT TO RIGHT IN SEQS HAHA)
11:16	justin_smith	beginning / end left / right, it works unless you're speaking Hebrew or Chinese or Japanese or whatever I guess
11:16	justin_smith	they actually do have ttys that go right to left
11:16	justin_smith	or back and forth for Arabic
11:19	jjttjj	Is there a reason not to just use Double/NaN all over the place with clojure.core.matrix so i can do vector math with missing values? ie (add [1 2 Double/NaN] [1 1 1]) => [2 3 NaN]
11:21	justin_smith	jjttjj: iirc hitting a NaN tends to make things slower - like the math unit does more work when it hits a nan or something
11:21	justin_smith	jjttjj: maybe there is a sparse matrix lib that would work?
11:22	jjttjj	justin_smith: cool thanks, I'll look into that
11:22	justin_smith	otherwise, if the perf is OK and it gives the right answer, go for it I guess?
12:23	sdegutis	justin_smith: thanks
12:24	sdegutis	for the helpful answer -- you are helpful as always
12:24	sdegutis	Is there something I can do to repay you for your generous help? Maybe you have a link I can advertise on my twitter account?
12:24	justin_smith	haha, not really, but I appreciate the gratitude
12:25	sdegutis	Are you sure I have 13 followers
12:25	sdegutis	I think one of them still uses twittr
12:25	justin_smith	lol
12:30	Weebz`	I'm having trouble figuring out how to do interop with Node.js libraries, could someone explain why I keep getting a no such namespace/use of undeclared var with this?
12:30	Weebz`	http://paste2.org/6mx8AA1k
12:30	Weebz`	i know in js it would be new sql.Connection(...)
12:32	Weebz`	merp. doing (new sql.Connection ...) seems to work
12:47	justin_smith	Weebz`:
12:47	justin_smith	err
12:47	justin_smith	Weebz`: (sql.Connection. ...) is more idiomatic though
12:53	justin_smith	,(java.util.Date. 0) ; vs (new java.util.Date 0)
12:53	clojurebot	#inst "1970-01-01T00:00:00.000-00:00"
13:13	Glenjamin	hi all, i'm experimenting with using clojure to write tests for a java app - is there any way to get leiningen to pull in dependencies from the "test" scope of a pom?
13:52	Glenjamin	is there any way to pass values created in clojure.test fixtures into tests
13:52	Glenjamin	or should i just use (binding) ?
13:59	sdegutis	I recently developed need for an email queue that runs in the background written in Clojure. However, I'm coming up with difficulties knowing how to communicate with such a background thread in a queue-like way.
14:00	sdegutis	Is there any such tools that help alleviate such technical difficulties of implementation for the burden of the developer?
14:00	sdegutis	Mitigation of any difficulty would be appreciated. Thanks.
14:02	sdegutis	justin_smith: do you ever write something like this and have recommendations?
14:05	sdegutis	Oh. Looks like core.async helps with this I think?
14:06	sdegutis	Reading https://github.com/clojure/core.async/blob/master/examples/walkthrough.clj suggests so.
14:14	jakedust	sdegutis: I'd say core.async + channels
14:14	sdegutis	Are channels part of core.async?
14:14	jakedust	yup
14:14	jakedust	if you are familiar with Go channels, they are very similar
14:14	sdegutis	Perfect, thanks!
14:14	sdegutis	Yep, I am.
14:14	sdegutis	Not 100% the same?
14:15	jakedust	I'm not knowledgeable enough to say if they are 100% the same, but I've never had problems so far assuming so
14:16	sdegutis	Cool, thanks jakedust!
14:16	jakedust	there's a lot more in core.async, but I basically just use goroutines and channels for everything
14:16	sdegutis	Sounds like a good plan.
14:27	carkh	sdegutis: core.async is nice, but not the only tool. channels are blocking, there are also agents which are not, but provide no control on the size of the queue (afaik)
14:27	sdegutis	carkh: I thought channels only block when unbuffered?
14:27	carkh	they will block on the size of your lossless buffer
14:28	carkh	i mention agents because i find them easier than channels for many tasks
14:28	sdegutis	Realistically though, all I need to do is tell a continuous background job to do something. I literally only need to send half a bit (a full bit could mean true/false, I only need to send "hey you, do your thing"). In which case, are channels overkill?
14:28	sdegutis	So maybe I do need agents.
14:29	carkh	you only need a thread then =)
14:29	sdegutis	How so?
14:29	carkh	why do you need a queue ? are you cosntrained by the possibility of too many "requests" ?
14:30	carkh	sometimes just fire and forget is enough
14:30	sdegutis	I just need to tell the background job "hey you got another job to do", and it knows where to find it. It'll keep doing jobs as long as there are some left. When there's none, it just waits for this message.
14:30	sdegutis	But it has to do them sequentially.
14:30	sdegutis	That's the difficult part. It can't do any of these jobs simultaneously, even though it can get simultaneous requests to do it.
14:31	carkh	with agents you have the risk of filling the memory with more requests than you can process, but it's sequential all right
14:31	norton-	I want to create my own project which uses code from this project, https://github.com/adamtornhill/code-maat , but it seems like it's not available as a library on clojars. Is there a simple way I can use the code? Copying all code into my own project perhaps works but it feels like there should be a better way.
14:31	carkh	with core.async you _can_ have backpressure
14:32	lxsameer	is it safe to derefrence an atom inside swap! of other atom ?
14:33	tcrawley	norton-: you can deploy to clojars under org.clojars.your-user-name/code-maat and use that
14:34	amalloy	lxsameer: it's safe in that you are guaranteed to get the current value of that atom. but it might well have a different value the very next instant, so any decision you make based on that value may be out of date
14:34	lxsameer	thanks
14:35	carkh	lxsameer: the best woudl be to deref outside of it though
14:35	lxsameer	carkh: awesome thanks
14:35	norton-	tcrawley: thanks
14:35	carkh	(swap! atom1 do-it @atom2) is correct
14:35	tcrawley	norton-: my pleasure!
14:44	jonathanj	liberator allows you to return a map from a handler which it will turn into JSON in the case of application/json media, but it's not clear how you have it encode some non-standard value into JSON
14:44	jonathanj	clojure.data.json/encode requires an additional arg that you don't have access to when using liberator like this
14:44	jonathanj	cheshire has a way to add an encoder globally but liberator isn't using cheshire
14:59	gfredericks	jonathanj: I swear data.json has a similar global mechanism
15:19	jonathanj	gfredericks: i don't know if i'm looking in the wrong place then but there doesn't seem to be anything like that here: http://clojure.github.io/data.json/
15:20	jonathanj	maybe JSONWriter? but what happens if i want to encode one of the existing types in a different way?
15:30	jonathanj	i feel a bit stupid: i don't understand how to invoke to-hex-string with clj-uuid
15:31	amalloy	carkh: that has exactly the same problem as derefing inside
15:31	jonathanj	(clj-uuid/to-hex-string (clj-uuid/v4)) tells me: java.lang.IllegalArgumentException: No implementation of method: :to-hex-string of protocol: #'clj-uuid/UUIDRfc4122 found for class: java.util.UUID
15:32	amalloy	you can't make a coordinated decision based on the instantaneous state of two different atoms: there is just no way to do it, because they are uncoordinated. if you need to do that, you want refs
15:32	carkh	amalloy: maybe for your concern, but the function should be pure, which it isn't when derefing inside
15:32	carkh	amalloy: true
15:33	amalloy	it's true you do avoid one problem by derefing outside, although it's not one that i find usually matters
15:33	carkh	amalloy: true again, i'm just blindly following the doc recommendation =)
15:45	jonathanj	gfredericks: so if i do something like: (extend java.util.UUID JSONWriter {:-write (fn [x ^PrintWriter out] (.print out (uuid/to-string x)))})
15:45	jonathanj	gfredericks: then i get json that looks like: {"foo": 1234-arst-uuid-goes-here}
15:46	jonathanj	and the "write-string" implementation in data.json is private
15:59	jonathanj	oh i have to import -write from clojure.data.json, that was not very obvious to me at all :(
16:02	gfredericks	jonathanj: yeah, or you can write the double-quotes yourself (which is what I did, but I like yours better)
17:28	uptown	in a cider REPL, can I hook namespace changes?
18:15	Frozenlock	uptown: hook namespace change?
18:17	uptown	execute a function when the user types (ns some.ns) in the REPL
18:21	Frozenlock	uptown: Hmm... ns is a macro, so I'm not sure this will work: https://github.com/technomancy/robert-hooke/.
18:22	Frozenlock	Otherwise you can jump through some hoops and do something similar I did to redefine 'fn' in https://github.com/Frozenlock/force-serialize
18:23	justin_smith	and you can also switch namespaces via in-ns, which is not a macro, it's a special form I think
18:23	justin_smith	maybe not
18:23	justin_smith	Frozenlock: uptown: put the hook on in-ns, ns calls in-ns
18:24	uptown	aha
18:24	Frozenlock	justin_smith: hooks work with special forms?
18:25	justin_smith	Frozenlock: it's not implemented in clojure, but it's also not a special form, it's just a function
18:25	justin_smith	so you can totally hook on it
18:25	amalloy	i don't think you really want to hook in-ns
18:25	justin_smith	oh?
18:25	amalloy	i mean, that will impact every namespace that gets loaded
18:25	justin_smith	that's true
18:27	justin_smith	amalloy: totally works though https://www.refheap.com/111402
18:28	Frozenlock	Btw, is technomancy still alive? I think the last time I heard of him he was moving to another country or something...
18:29	justin_smith	Frozenlock: he pops up in #leiningen sometimes
18:29	justin_smith	he just dropped out of the high-pace #clojure lifestyle
18:29	uptown	for clarity, the point of this is to print a count and abbreviated list of publics when i switch namespaces as a sanity / typo check
18:30	justin_smith	uptown: that should be pretty easy with alter-var-root if you don't mind a permanent change, but robert.hooke does it much more elegantly, if you don't mind this printing every time a namespace gets loaded
18:31	uptown	justin_smith: i think the point is print it every time i change
18:31	uptown	which i understand would annoy most people but
18:32	Frozenlock	uptown: many editors will also autocomplete and offer the list of known functions/variables if you are worried about typos.
18:32	uptown	i seem to make enough typos to justify it
18:33	uptown	my emacs setup seems not to do that for me? perhaps that's my real problem
18:33	Frozenlock	Yeah, I'd check that first :-p
18:33	Frozenlock	Cider?
18:34	uptown	an excellent point. got frustrated and started treating symptoms
18:34	uptown	yes, cider / emacs
18:36	Frozenlock	uptown: I'm using Cider with Company-mode: http://i.imgur.com/5aTa1N2.png
18:38	Frozenlock	So I've got the dropdown menu as shown, TAB autocomplete, and in some cases hippie-expand (meta-/). I ain't got any typos :-p
18:38	uptown	company-mode offers me namespaces i've previously mentioned but does not expand to a list of funtions
18:39	uptown	but you have fewer cider / nrepl warnings on startup than i do
19:02	noncom\|3	i am working on a PC with limited caps, and eclipse is getting very hungry, it can eat like 400-800mb. i am thinking about moving to emacs on this machine, how do you think, will it be more feasible?
19:02	oddcully	Eight Megs And Constantly Swaping - should work fine then!
19:03	Frozenlock	noncom\|3: It will most probably work. The only question is 'are you read for Emacs?'
19:03	Frozenlock	*ready
19:03	justin_smith	emacs is much weirder, but yeah, it can also run with less heap
19:03	noncom\|3	yeah, i got some experience with emacs
19:04	noncom\|3	on my last emacs usage though, i remember the weirdness - the linum mode was taking up to 15% CPU !
19:04	Frozenlock	o_O
19:04	noncom\|3	i remember discussing that on #emacs and people said, like yeah, well, linum eats that much
19:04	noncom\|3	and i was like WTF
19:04	noncom\|3	maybe even up to 25 CPU, i don't recall exactly.
19:04	noncom\|3	i can check tomorrow
19:05	noncom\|3	i got to know this by some inbuilt emacs profiler..
19:05	noncom\|3	i dont remember how to call for it, but someone on #emacs guided me
19:05	noncom\|3	that's the story..
19:06	noncom\|3	*it was taking that much on scrolling
19:07	noncom\|3	justin_smith: btw, what about that hang in your app? did you nail it down?
19:07	Frozenlock	How do you use linum? I don't use it and I might be missing on some nice wizardry...
19:07	noncom\|3	Frozenlock: i just hardcodely enable it in init.el for everything
19:08	noncom\|3	you know, i like having line numbers everywhere
19:08	Frozenlock	But it only shows the line number?
19:08	noncom\|3	no, it shows a column of numbers to the left
19:08	noncom\|3	like that: http://joxi.ru/82QVZ9eIYO4QAd
19:08	noncom\|3	(it's eclipse)
19:09	Frozenlock	Yes... what I'm asking is how do use that in your workflow.
19:09	noncom\|3	for navigation, for stack traces
19:09	noncom\|3	somehow i feel better with it
19:09	oddcully	Frozenlock: some folks need that to see... others just tell the editor
19:09	noncom\|3	tried to work without it, but found that i always turn it on
19:11	Frozenlock	I see. Yeah I just tell emacs to go to line when I have a stacktrace. 'M-g g'
19:12	noncom\|3	i know, eclipse can do this too
19:12	Frozenlock	I hope so :-p
19:12	noncom\|3	:D
19:27	the_nonameguy	hey, has anyone written a test.check generator based on a schema from the 1.0 prismatic/schema release?
19:30	the_nonameguy	http://blog.getprismatic.com/schema-1-0-released/
19:30	the_nonameguy	it states that it 'provides way to plug in custom generators', but I couldn't figure out how, based on the source
20:06	gfredericks	the_nonameguy: haha I just figured that out today
20:07	gfredericks	(cgen/generator the-schema {SomeSchema some-generator})
20:41	bluezone	OH my GOD. How on EARTH do I erase brackets around an expression in Cursive ?!?!
20:41	cfleming	bluezone: https://cursiveclojure.com/userguide/paredit.html :)
20:43	bluezone	GOD BLESS YOU!
20:43	gfredericks	~GOD \|BLESS\| cfleming
20:43	clojurebot	'Sea, mhuise.
20:51	TEttinger	to the tune of god bless america: GOD BLESS G. FREDERICKS / TESTS CAN BE CHUCKED / MAKE EXPRESSIONS / AND DOUBLES / FROM THE NAN TO THE HASH DOUBLE QUOTE
20:52	TEttinger	sorry cfleming, your name doesn't have the extra syllable to fit the scheme
20:53	cfleming	It would have to be a fle-he-ming - worse things have been done to make something scan
20:53	TEttinger	phlegming
20:54	TEttinger	really appreciate what you wonderful tools authors do
20:54	TEttinger	I'm so glad clojure has a good community of people making productivity better for everyone
20:57	cfleming	I notice that only gfredericks gets a song, though.
20:57	cfleming	I mean, I'm just saying.
21:05	TEttinger	to the tune of god bless america: GOD BLESS INTELLI J/ CURSIVE WE LOVE / USE PAREDIT / AND EDIT / ALL YOUR CLOJURE WITH C FLEMING'S HUG
21:06	cfleming	TEttinger: That's awesome. I'm going to make Cursive play that at startup.
21:06	TEttinger	haha
21:07	cfleming	It'll be like the pledge of allegiance
21:08	cfleming	I wonder if I could remix it to the tune of God save the Queen
21:08	gko	Is there a way to have a Cursive REPL in a single window?
21:09	cfleming	gko: How do you mean, in a single window?
21:09	gko	I mean not a "output window on top / input window at the bottom"
21:10	gko	one window with both input and output
21:10	gko	like most REPL
21:10	gko	like in cider or SLIME
21:12	cfleming	gko: No, there isn't
21:12	bluezone	https://www.refheap.com/111403 I'm trying to have the function accept a vector. I believe I am doing something wrong :/
21:13	cfleming	It's because in IntelliJ editors are strongly typed, so the input editor has to be a Clojure editor, but the output isn't actually Clojure, it's arbitrary text
21:13	cfleming	gko: So I have to separate them.
21:14	cfleming	That said, it's actually quite nice, especially for editing multi-line forms.
21:14	gko	cfleming: oh, so if you insert random text it will actually try to parse the colors, etc...
21:15	cfleming	gko: Right. There's actually a problem with that, which is that if you try to (read) in a Cursive REPL, it currently won't work well.
21:15	cfleming	Since Cursive will always try to treat it as Clojure code.
21:17	cfleming	There are some potential hacks to get around that, but I haven't implemented anything yet.
21:17	gko	OK, too bad... fortunately, there's cider for the REPL side...
21:20	gfredericks	wow a lot of singing happened here while I wasn't looking
21:20	bluezone	It's telling me on line 7 that i'm passing 4 arguments https://www.refheap.com/111404
21:20	bluezone	I'm just trying to pass [1 2 3 4 5] into the vect parameter :(
21:20	gfredericks	bluezone: that's not causing the error
21:20	gfredericks	it's happening on line 5
21:21	cfleming	gfredericks: It was great.
21:21	bluezone	Why doesn't the stack trace tell me that :(
21:21	gfredericks	bluezone: what's the stack trace look like? it ought to
21:22	cfleming	gfredericks: Are you going to be at the conj?
21:22	gfredericks	cfleming: absolutamente
21:22	cfleming	gfredericks: Muy bien
21:22	cfleming	We can sing odes to each other.
21:22	bluezone	gfredericks: https://www.refheap.com/111406 (in my code, line 5 is line 7)
21:22	cfleming	TEttinger has given us some great material
21:22	badatclojure	Hey guys! Quick question about multimethods. I'm wanting to dispatch off a map containing a certain property (params request in Compojure). Is there a good way to do that?
21:23	gfredericks	I'll sing you your song if you sing me mine
21:23	badatclojure	certain key* sorry
21:23	gfredericks	bluezone: looks like the problem is you're not seeing the stack trace at all -- try typing *e at the repl
21:24	bluezone	oh, heh nice
21:25	gfredericks	this year will be my first conj since maybe the first one
21:25	gfredericks	or maybe the second one
21:25	gfredericks	they were so long ago now I can't remember
21:30	Frozenlock	bluezone: the clojure syntax?
21:30	bluezone	yes
21:31	bluezone	never sure when to put brackets
21:32	Frozenlock	Do you have an editor that highlights the brackets?
21:32	TEttinger	unless you have ' quotes involved, () starts with a function to call and anything else in it is an argument
21:32	TEttinger	that's most of it
21:32	bluezone	hmm
21:32	badatclojure	brackets are basically used to separate functionality. In Java, you'd type something like cons(a,b). In clojure, you move the name inside the parens and drop the comma (cons a b).
21:32	TEttinger	(function or macro)
21:33	Frozenlock	It's like math :-p
21:33	bluezone	if I want to pass rest vect as one parameter I need to do (rest vect) ?
21:33	badatclojure	same thing for deeper function stacks. Java: cons(a, something(b)) Clojure: (cons a (something b))
21:33	TEttinger	,(let [vect [1 2 3 4 5]] (map inc (rest vect)))
21:33	clojurebot	(3 4 5 6)
21:34	bluezone	hmm
21:35	TEttinger	inc is sorta like ++, it increments (but doesn't change any existing variables, things that do that are rare)
21:35	bluezone	I think I'm just unaware of something special i need to do for recursion
21:35	TEttinger	,(let [vect [1 2 3 4 5]] (rest vect))
21:35	clojurebot	(2 3 4 5)
21:36	TEttinger	bluezone, usually you don't directly do recursion in clojure
21:36	TEttinger	there's loop and recur, which are pretty much always used together
21:36	bluezone	wat
21:36	Frozenlock	bluezone: Don't listen to him, recursions are cool :-D
21:36	badatclojure	Bluezone: Direct recurson doesn't happen much. You'll see loop and recur. Oh, and you'll see map a lot too.
21:36	TEttinger	tail recursion can blow the stack if you don't use loop/recur
21:37	badatclojure	Yeah, make sure to use loop/recur.
21:37	TEttinger	(also non-tail recursion)
21:37	bluezone	I guess they aren't using java8? I think they removed that problem in java8
21:37	badatclojure	Learned that the hard way.
21:37	TEttinger	nope
21:37	TEttinger	java8 still lacks TCO
21:37	bluezone	java8 still lacks a language
21:37	badatclojure	I dont really know when Java8 will have TCO.
21:37	TEttinger	it as under consideration
21:37	TEttinger	*was
21:37	Frozenlock	I use recursions when I know my dataset will be small-ish. loop/recur is... not pretty.
21:38	jasonx2	in some ways recur is nicer than tail recursion. you get a compile-time check if your function is tail recursive
21:38	badatclojure	People dont really write recursive Java to my knowledge though. Or really even try. Stateful recursion is scary anyways.
21:38	TEttinger	I strongly recommend trying to phrase things with map, filter, recur, and other common fns like that before you start doing loop/recur
21:38	TEttinger	*map, filter, reduce
21:39	bluezone	I just don't understand why it's still passing 4 arguments https://www.refheap.com/111407
21:39	badatclojure	Shameless self-plug. Could someone explain how to setup multimethods that dispatch off of a key existing in a map parameter?
21:40	bluezone	like it takes the rest of vect, but instead of passing it as a vect it passes each value individually
21:40	Frozenlock	bluezone: https://www.refheap.com/111408
21:41	Frozenlock	And you don't need the 'apply', unless I misunderstood what you are trying to do.
21:41	netrobyatmobile	who know how to compile Clojure code into Executable Binary ELF file?
21:42	bluezone	Well
21:42	bluezone	shit
21:43	Frozenlock	(first-element) is like calling the function 'first-element' which doesn't exist.
21:43	bluezone	yeah, hmm
21:43	bluezone	Thanks
21:46	TEttinger	netrobyatmobile: you would need to get the JVM bundled in there too
21:47	bluezone	Seems the solution works in my environment but not on 4clojure <3
21:47	netrobyatmobile	Thanks, i hate JVM , it will takes more than 200MB space.
21:47	netrobyatmobile	Download, Upload the whole distribution was huge packages.
21:47	TEttinger	there's clojurescript and clojure CLR
21:47	netrobyatmobile	Long time to waiting it deliveried
21:48	Frozenlock	bluezone: link?
21:48	bluezone	Frozenlock: https://www.4clojure.com/problem/19
21:49	TEttinger	netrobyatmobile: Pixie is similar to Clojure in lots of ways but doesn't use the JVM
21:49	TEttinger	it also is not very finished yet I think, though it's getting better
21:50	Frozenlock	bluezone: If you are not using 'defn', I suppose you are using 'fn'?
21:50	bluezone	it tells me I tripped the alarm? O.o I dunno wtf
21:50	Frozenlock	Ah ok
21:50	Frozenlock	So yeah, you can't define functions.
21:50	bluezone	err
21:50	Frozenlock	But you can create one that will be used immediately with 'fn'.
21:51	Frozenlock	"define function" -> defn \| "function" -> fn
21:52	bluezone	well How can i use recursion if I don't have the function name
21:52	cfleming	netrobyatmobile: Check out Avian, it's an alternative lightweight JVM which can compile an executable
21:52	Frozenlock	bluezone: fn accepts an optional name.
21:52	cfleming	It's not high performance, depends on your use case
21:52	Frozenlock	Type (doc fn) in your repl.
21:53	Frozenlock	(fn last-e [vect]...
21:54	bluezone	so what would be the difference between (defn last-e) and (fn last-e)
21:55	bluezone	ah
21:55	bluezone	nevermind, fn is used immediately I guess
21:55	bluezone	defn creates a function for later use
21:59	jakedust	not really that Clojure-related, but does anybody have any recommendations of readings/code on building "services"? i.e. I want to build a data processing service with a REST API for both task-related commands (do task A as soon as you can) and "lifecycle" commands (finish all the jobs you have right now and exit as soon as you can)
22:00	jakedust	my original idea was writing everything around an event loop and core.async channels, but I'm not sure if that's a good idea or not, I'm really not familiar with this
22:01	netrobyatmobile	Thanks /msg cfleming
22:10	bluezone	Well this seems like a really sexy language so far
22:11	bluezone	I love that-I-Can-do-this insteadOfThisCamelFatassAnnoyance
22:12	jakedust	bluezone: I have to confess that seeing * in names is confusing, but still lovely
22:20	Frozenlock	bluezone: be warned, this is a one way trip.
22:20	bluezone	Frozenlock: away from what? java?
22:20	Frozenlock	It's like going from 56k to broadband.
22:21	Frozenlock	All-the-things!
22:22	bluezone	eh, I don't care anymore lol. Prefer to be a bum than to fall asleep coding in boring languages
22:22	jakedust	Frozenlock: I've been bitten by the Clojure bug.
22:22	Frozenlock	jakedust: https://mlpforums.com/uploads/monthly_06_2015/post-20300-0-98845900-1435445700.jpg
22:23	jakedust	heh, I though it'd be a parasprite, given the URL
22:23	jakedust	but yeah
22:24	Frozenlock	Pff, that's URLism
22:24	Frozenlock	Don't judge based on URL dude.
22:26	jakedust	weirdly enough, it feels like I was on another extreme, using scalaz everyday
22:33	bluezone	I keep tripping the alarm -.-
22:33	bluezone	They have so many restrictions on identifier names
22:35	TEttinger	cfleming: does avian work with clojure now?
22:36	TEttinger	I tried it a while ago, it didn't support some java data structures clojure needed
22:36	TEttinger	(also, netrobyatmobile, there's zulu builds of OpenJDK that are much less than 200MB)
22:37	TEttinger	(and you are allowed to take stuff out of those)
22:44	cfleming	TEttinger: I believe it does, but you might have to use a different class library
22:44	cfleming	The default one is very limited, but you can use OpenJDK classes or the Android ones IIRC
23:32	jeaye	,(-> [:foo] first name symbol list str)
23:32	clojurebot	"(foo)"
23:32	jeaye	^ is there a cleaner way to get the same result, given [:foo]?
23:34	irctc	hi guys does anyone know how to run om-next-demo project
23:34	irctc	https://github.com/swannodette/om-next-demo
23:34	irctc	I have managed to get all the deps working, it seems we need to run some kind of script instead lf lein run.
23:35	irctc	I have read this https://github.com/clojure/clojurescript/wiki/Quick-Start, but it's a bit confused. Any help would be appreciated.
23:38	TEttinger	,(map symbol [:foo])
23:39	clojurebot	#<ClassCastException java.lang.ClassCastException: clojure.lang.Keyword cannot be cast to java.lang.String>
23:39	TEttinger	hm
23:39	TEttinger	,(map (comp symbol name) [:foo])
23:39	clojurebot	(foo)
23:39	TEttinger	,(str (map (comp symbol name) [:foo]))
23:39	clojurebot	"clojure.lang.LazySeq@9e9a82cb"
23:39	jeaye	apply str
23:40	jeaye	,(apply str (map (comp symbol name) [:foo]))
23:40	clojurebot	"foo"
23:40	jeaye	ah
23:40	jeaye	Well, maybe what I have isn't so bad then.
23:41	TEttinger	,(map #(str "(" (name %) ")") [:foo])
23:41	clojurebot	("(foo)")
23:42	jeaye	heh
23:42	jeaye	There's a lot more syntax there.
23:42	TEttinger	,(apply str (map name [:foo]))
23:42	clojurebot	"foo"
23:43	jeaye	,(apply str (map (comp list name) [:foo]))
23:43	clojurebot	"(\"foo\")"
23:43	jeaye	,(apply str (map (comp list symbol name) [:foo]))
23:43	clojurebot	"(foo)"
23:43	jeaye	Correct result, not any cleaner.
23:44	TEttinger	,(pr-string (map name [:foo]))
23:44	clojurebot	#error {\n :cause "Unable to resolve symbol: pr-string in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: pr-string in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: pr-st...
23:44	TEttinger	,(pr-str (map name [:foo]))
23:44	clojurebot	"(\"foo\")"
23:44	TEttinger	hm
23:45	TEttinger	,(pr-str (map str [:foo]))
23:45	clojurebot	"(\":foo\")"
23:45	TEttinger	,(pr-str (map (comp symbol name) [:foo]))
23:45	clojurebot	"(foo)"
23:52	TEttinger	,(apply str (nfirst (map name [:foo])))
23:52	clojurebot	"oo"
23:55	TEttinger	,(apply str (nfirst [:foo]))
23:55	clojurebot	#error {\n :cause "Don't know how to create ISeq from: clojure.lang.Keyword"\n :via\n [{:type java.lang.IllegalArgumentException\n :message "Don't know how to create ISeq from: clojure.lang.Keyword"\n :at [clojure.lang.RT seqFrom "RT.java" 535]}]\n :trace\n [[clojure.lang.RT seqFrom "RT.java" 535]\n [clojure.lang.RT seq "RT.java" 516]\n [clojure.lang.RT next "RT.java" 682]\n [clojure.core$n...
23:55	TEttinger	,(apply str (nnext (str [:foo])))
23:55	clojurebot	"foo]"
23:55	TEttinger	damn
23:57	TEttinger	,(str "(" (name (first [:foo])) ")")
23:57	clojurebot	"(foo)"
23:57	TEttinger	,[(count "(str \$ (name (first [:foo])) \$)") (count "(-> [:foo] first name symbol list str)")]
23:58	clojurebot	[33 38]
23:58	TEttinger	so there's some teensy golf
23:58	TEttinger	the list threw me off initially, so in my mind the explicit str with parens shows the end result