#clojure – 2015-03-03

2015-03-03

00:00	h_	how might I serialize a function such that I could write it to a file and recall an identical function from that file at a later time?
00:00	puredanger	https://github.com/technomancy/serializable-fn
00:01	h_	hooray! thank you friend
00:04	puredanger	enjoy!
00:08	h_	`3`3
00:08	h_	<3<3 even!
02:36	je	is there a way from the repl to "inspect" data to explore all the interfaces it implements and all the classes it inherits from
02:36	amalloy	&(ancestors clojure.lang.PersistentVector)
02:36	lazybot	⇒ #{clojure.lang.IMeta java.lang.Comparable clojure.lang.Indexed clojure.lang.IPersistentVector java.lang.Iterable java.util.List clojure.lang.Associative clojure.lang.IObj clojure.lang.APersistentVector clojure.lang.Reversible java.lang.Object clojure.lang.Seqable clo... https://www.refheap.com/98040
02:37	je	I want to identify commonality for dispaching in a multimethod
02:38	je	amalloy: nice thanks
02:42	TEttinger	(inc amalloy)
02:42	lazybot	⇒ 231
03:34	dm3	hello
03:34	daniel`	hi
03:34	dm3	is there an "approved" way to detect if a sequence is lazy?
03:35	dm3	I know there's a clojure.lang.LazySeq, but does it cover all cases?
04:15	justin_smith	dm3: it's the only lazy type in clojure. Though they can hide.
04:15	justin_smith	,(type (cons :a (range)))
04:15	clojurebot	clojure.lang.Cons
04:15	justin_smith	that's a cons, but it's tail is lazy
04:15	justin_smith	,(type (range))
04:15	clojurebot	clojure.lang.LazySeq
04:18	dm3	I'm trying to enforce stricter semantics for an fn which operates in a dynamic scope
04:18	dm3	know that there'll be trouble with nested lazy sequences, but forcing the outer one should cover 95% of use cases
04:18	godd2	opens lein repl (reduce + (range)) ; oh god what have I done
04:19	dm3	guess just checking if it's a sequence and doall'ing would be enough
04:19	justin_smith	dm3: if you know you won't get (range) or (iterate ...)
04:19	dm3	yes
04:20	justin_smith	you could also do a clojure.walk/postwalk, which will hit every subtree, and try to fully descend every subtree
04:20	justin_smith	hmmm. maybe just a (dorun (tree-seq ...))
04:27	dm3	justin_smith: thanks
04:29	justin_smith	,(tree-seq coll? seq [:a [:b {:c 0 :d 1 :e #{1 2 3}}]])
04:29	clojurebot	([:a [:b {:e #{1 3 2}, :c 0, :d 1}]] :a [:b {:e #{1 3 2}, :c 0, :d 1}] :b {:e #{1 3 2}, :c 0, :d 1} ...)
04:35	TEttinger	&(tree-seq coll? seq [:a [:b {:c 0 :d 1 :e #{1 2 3}}]])
04:35	lazybot	⇒ ([:a [:b {:e #{1 3 2}, :c 0, :d 1}]] :a [:b {:e #{1 3 2}, :c 0, :d 1}] :b {:e #{1 3 2}, :c 0, :d 1} [:e #{1 3 2}] :e #{1 3 2} 1 3 2 [:c 0] :c 0 [:d 1] :d 1)
04:35	justin_smith	aint no room for a lazy seq to hide in there
04:35	TEttinger	I have no idea how tree-seq works
04:36	justin_smith	TEttinger: it returns every sub tree
04:36	justin_smith	and every sub-tree of each sub-tree
04:36	justin_smith	the first arg is the function which tells you if a thing has sub-trees
04:36	justin_smith	the second arg is the thing that returns the sub-trees, if it has them
05:40	dysfun	what do i need to do to correctly inflate a ns-qualified symbol in an edn file to a value? let's assume for now that the code is in the classpath
05:43	dysfun	aha, find-var
05:58	ggherdov	,(->> '([1 :a] [2 :c]) (sorted-map-by <))
05:58	clojurebot	#<IllegalArgumentException java.lang.IllegalArgumentException: No value supplied for key: ([1 :a] [2 :c])>
05:58	ggherdov	,(->> '([1 :a] [2 :c]) (apply (sorted-map-by <)))
05:58	clojurebot	[2 :c]
05:58	ggherdov	,(->> '([1 :a] [2 :c]) flatten (apply (sorted-map-by <)))
05:58	clojurebot	#<ArityException clojure.lang.ArityException: Wrong number of args (4) passed to: PersistentTreeMap>
05:59	ggherdov	you have a list of keyvals (as vectors), and want to build a sorted-map-by. How do you do?
05:59	Glenjamin	(doc into)
05:59	clojurebot	"([to from] [to xform from]); Returns a new coll consisting of to-coll with all of the items of from-coll conjoined. A transducer may be supplied."
06:00	TEttinger	,(into (sorted-map-by <) '([1 :a] [2 :c]) )
06:00	clojurebot	{1 :a, 2 :c}
06:00	ggherdov	thanks TEttinger Glenjamin
06:00	TEttinger	np
07:35	razum2um	dnolen: what's the status of cljs support of promise/deliver/deref ?
07:35	dnolen	razum2um: no support is planned, JS is single-threaded
07:50	razum2um	dnolen: yes, but what king of abstraction should we use to "fix" callback hell?
07:50	dnolen	razum2um: core.async
07:50	razum2um	besides of core.async :)
07:50	razum2um	say, setTimeout
07:51	dnolen	razum2um: core.async is the best solution
07:52	razum2um	dnolen: but there is a lot of promise-solutions as libraries (besides ES6 promisses) - why not to map them and choose one of the polyfill for older browsers?
07:53	dnolen	razum2um: I don't really have anything else to say on this topic than what I've already said. Sorry.
07:53	razum2um	dnolen: ok then, thanks :)
07:54	sveri	razum2um: I guess you are free to create your own abstractions over one of the existing libraries
07:54	sveri	If you feel the need for them
07:55	razum2um	sveri: yes, native calls to js/.. work, but I just worder why promise is not implemented
07:57	sveri	I see :-)
08:03	dnolen	razum2um: if it wasn't clear earlier, JS promise abstractions are nothing like the Clojure promise abstraction which has blocking semantics for deref. This would imply duplicating core.async but would require whole program transform.
08:04	dnolen	razum2um: it hasn't been done because the semantics can't be preserved
08:04	dnolen	without too a big tradeoff
08:27	piranha	hey all! I'm trying to call Java method with spread arguments (...): http://cr.openjdk.java.net/~sundar/jdk.nashorn.api/8u40/javadoc/jdk/nashorn/api/scripting/NashornScriptEngineFactory.html#getScriptEngine-java.lang.String...-
08:27	piranha	rs-example.server.render> (.getScriptEngine f "-pcc" "-ot=true")
08:27	piranha	java.lang.ClassCastException: Cannot cast java.lang.String to [Ljava.lang.String;
08:27	piranha	and it fails with this ^
08:27	piranha	am I doing something wrong?
08:28	piranha	ah! (into-array String ["a", "b"]) helps
08:46	sveri	Hi, anyone knows how to properly handle umlaute with transit? transit converts umlaute wrong and makes weird chars of it, see this: http://pastebin.com/7Z8x3C5d
08:47	Eremox	How do i stop cider from swapping to error-buffer and set it to just print the error message in the repl instead?
08:49	dnolen	sveri: I don't think transit-clj will handle that for you by default, http://stackoverflow.com/questions/15356716/how-can-i-convert-unicode-string-to-ascii-in-java
08:50	dnolen	sveri: perhaps worth opening an enhancement issue w/ transit-java
08:51	sveri	dnolen: thank you, I will do that. Not sure exactly, but this is something I would expect to be handled by the library
08:51	dnolen	sveri: perhaps, not sure about the perf implications though
08:52	sveri	dnolen: maybe it can be made optional, however, thank you, I open an issue :-)
09:23	borkdude	I might be brainnumbed, but is there an easier way to update the val in a map? (update-in {:foo "bar"} [:foo] count)
09:23	borkdude	of a collection of maps that is
09:23	borkdude	so (map #(update-in ....))
09:24	gfredericks	borkdude: clojure 1.7 has update
09:24	borkdude	gfredericks yes, I heared.
09:24	borkdude	gfredericks when is it out?
09:25	gfredericks	dunno; prismatic/plumbing also has it in the meantime
09:25	borkdude	k
09:26	gfredericks	,(defmacro map-> [& exprs] `(map #(-> % ~@(butlast exprs)) ~(last exprs)))
09:26	borkdude	https://github.com/clojure/clojure/blob/2e76c57d3b7672ce5eca096ed2059d9a1dd379d0/src/clj/clojure/core.clj#L5909
09:26	clojurebot	#'sandbox/map->
09:27	gfredericks	,(->> [{:foo 12} {:foo 13} {:foo 92}] (map-> (* 2) (inc)))
09:27	clojurebot	#<ClassCastException java.lang.ClassCastException: clojure.lang.PersistentArrayMap cannot be cast to java.lang.Number>
09:27	gfredericks	whoopsiedoodle
09:27	gfredericks	,(->> [{:foo 12} {:foo 13} {:foo 92}] (map-> (update :foo * 2)))
09:27	clojurebot	({:foo 24} {:foo 26} {:foo 184})
09:28	gfredericks	no idea if map-> is defined in some lib somewhere
09:28	borkdude	gfredericks thanks ;)
09:29	gfredericks	np
09:51	borkdude	gfredericks I found reduce-kv also handy
09:53	gfredericks	borkdude: for your original question?
09:53	borkdude	gfredericks yes
09:53	borkdude	gfredericks it was a little bit different than I asked, but eventually this is what I needed. didn't know about this one yet
09:54	jcromartie	.
09:56	gfredericks	,
09:56	jcromartie	excuse me
09:56	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
09:56	jcromartie	I was cleaning my keyboard
09:56	jcromartie	:P
09:56	jcromartie	,(((
09:56	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
09:56	gfredericks	,())))
09:56	clojurebot	()
09:56	jcromartie	I have a recipe for pain
09:57	jcromartie	a Clojure app that depends on Ruby gems to be available at runtime
09:57	jcromartie	I think binstubs may be the answer
09:57	jcromartie	I dunno
09:58	jcromartie	it's particularly troublesome with Emacs and Cider launching the REPL process
09:58	jcromartie	I can't figure that one out
10:01	loliveira	I would like to run java -jar my_uber.jar —repl and get a repl. Do you know how to do that?
10:03	jcromartie	what was that cider-related channel?
10:05	katratxo	loliveira: https://github.com/clojure/tools.nrepl#embedding-nrepl-starting-a-server
10:14	justin_smith	loliveira: java -cp my_uber.jar clojure.main
10:14	justin_smith	or that
10:14	justin_smith	but clojure.main will give you a repl
10:15	loliveira	katratxo: justin_smith: thank you!
10:15	loliveira	it worked. =)
10:17	justin_smith	loliveira: if you prefer the nrepl repl to the clojure one, you can launch the nrepl server from your own app (or even from the clojure repl) as described in katratxo 's link, and then connect to it with "lein repl :connect N" where N is the port number it opens
10:19	loliveira	justin_smith: I will try the nrepl approach.
10:19	loliveira	justin_smith: I will put the follow up.
10:23	justin_smith	loliveira: a trick I often use is to have an optional environment variable, which if set, I turn on an nrepl server from my process
10:23	loliveira	justin_smith: good idea.
10:23	justin_smith	but the java -cp ... clojure.main is useful for if I want to just run some code with exactly the setup that would be available on the server
10:24	justin_smith	not running the app, but just running some code that I think might have failed in production for example
10:25	justin_smith	(I used this recently to verify that tomcat was making the serving of resources inside the jar with unusual names 404)
10:33	loliveira	aggred
10:34	loliveira	justin_smith: I have the same need that you had.
10:36	justin_smith	loliveira: another trick that I needed in that case, because this was a war file and not a jar file, I needed to also explicitly add the clojure.core to the class path because of how wars are packed up
10:36	justin_smith	probably not an issue in your case
10:37	loliveira	i used to deploy wars.
11:21	timvisher	what's the state of clojure servers at this point? last i heard you really weren't supposed to serve out of embedded jetty in prod using `lein ring server`, but people weren't thrilled with tomcat, some people were using application servers (way heavier than i need), and some people were thrilled with http-kit (which is embedded in the app so you can just `lein run`?)
11:22	justin_smith	timvisher: I think http-kit and aleph are great options, and using lein to run in prod is a bad idea
11:22	justin_smith	better to create an uberjar and use java -jar ... or java -cp ...
11:23	justin_smith	lein is a great dev tool, but it doesn't help you much in production
11:23	schmir	the boot people advertise using boot in production
11:23	timvisher	justin_smith: indeed. :) i've heard that over the years but never dove into why. is there a good doc somewhere that expresses that?
11:23	justin_smith	that's a choice I wouldn't be likely to make, but I know that a lot of people use lein in prod too
11:24	justin_smith	timvisher: for starters, lein starts up an extra vm you don't need. It also sets jvm options that optimize startup time at the expense of performance (turning down the JIT options)
11:25	justin_smith	timvisher: but even if it wasn't actively reducing performance, it's functionality I don't need, a program I don't need to install, and an extra place for things to break that can be removed from the prod environment
11:25	timvisher	justin_smith: all good points
11:25	michaelr`	anything out there which converts html to clean, formatted hiccup?
11:25	timvisher	do you also embed an nrepl server?
11:26	timvisher	michaelr`: bet you pandoc could do it! (or at least get you stupid close) :)
11:26	timvisher	but i haven't heard of anything
11:26	justin_smith	timvisher: I use an environment variable to optionally start nrepl (local host only, ssh tunnel to connect)
11:26	timvisher	michaelr`: actually, i take that back. doesn't enlive get you very close?
11:26	timvisher	i suppose it wouldn't pretty print, but that's why clojure.pprint is a thing
11:26	bja	michaelr`, I think I've used hickory for that before
11:27	timvisher	https://github.com/cgrand/enlive
11:27	timvisher	guess it depends what you mean by clean
11:27	justin_smith	timvisher: the nrepl optionally being started in it's own thread from the function that starts the web server
11:27	timvisher	justin_smith: and then start up the nrepl server internal to the app?
11:27	timvisher	nice
11:27	michaelr`	hickory give hiccup but it's full of empty strings and empty attribute maps
11:27	justin_smith	right, the app's logic turns on the server if the env var is set
11:28	justin_smith	timvisher: one caveat that doesn't affect most of us: don't run nrepl on a machine that is actually multi-user, because anyone on the machine can access the nrepl port and get the full permissions of the user running the clojure process
11:28	justin_smith	but who uses multi user machines for anything nowadays anyway
11:28	michaelr`	i need to import html which the designer built into my om views
11:29	michaelr`	which are written in hiccup (sablono)
11:29	michaelr`	so I thought that I must not be the first to do that :)
11:29	justin_smith	michaelr`: the reason hickory gives you empty strings (or strings with spaces) is that this ensures that the rendering gives you an identical document to the intial input, whitespace and all
11:30	michaelr`	justin_smith: that's fine by me, but it doesn't help with my use case :)
11:30	justin_smith	rihgt
11:30	justin_smith	I think enlive's html-resource likely gives you a cleaner data structure
11:31	justin_smith	or whatever the function is that gives you a data structure from an html file - forgetting the name
11:31	Glenjamin	there's a list here: https://github.com/weavejester/hiccup/wiki/Converting-html-to-hiccup
11:32	justin_smith	Glenjamin: nice!
11:32	michaelr`	Glenjamin: a list!? cool
11:32	justin_smith	(inc Glenjamin)
11:32	lazybot	⇒ 16
11:32	Glenjamin	it's a fairly short list
11:32	bja	michaelr`, this solution on stack overflow seems to work in my repl pretty well: https://stackoverflow.com/questions/11094837/is-there-a-parser-for-html-to-hiccup-structures
11:32	bja	it uses enlive
11:32	justin_smith	still, we can assume weavejester will update it occasionally
11:33	justin_smith	bja: yeah, that's what I use (or very close to it)
11:34	michaelr`	bja: thanks, let me check that too..
13:11	daGrevis	hi! how is lein test finding tests? i would like to split my core_test.clj into many files
13:11	daGrevis	also, are new kids using lein test or there's another better testing framework out there?
13:12	gfredericks	daGrevis: `lein test` looks through all the namespaces under /test, I think
13:12	gfredericks	so it sounds like you just want to make more namespaces
13:12	gfredericks	normally namespaces <--> files are 1-to-1, with corresponding names
13:13	gfredericks	clojure.test is fine for a lot of people; depends on your taste
13:14	daGrevis	gfredericks, okay, thanks! clojure.test works fine for me too :P
13:15	emaczen	I'm trying to update two lazySeqs in an atom with swap!
13:16	emaczen	(swap! state update-in [:waste :foundation] rest conj (first waste))
13:16	emaczen	The keywords have the same name as the arguments passed into the method
13:17	gfredericks	I'm having trouble figuring out what you're going for there
13:17	emaczen	This swap form should do the same thing as (push (pop waste) foundation)
13:17	hiredman	emaczen: that is a race condition
13:17	emaczen	I want to update the lazySeqs given by :waste and :foundation in atom state
13:18	emaczen	I want the function rest applied to the waste (to remove the first element) and I want to put the first element of waste at the front of foundation
13:19	gfredericks	(swap! state (fn [{:keys [waste] :as current-state}] (-> current-state (update-in [:waste] rest) (update-in [:foundation] conj (first waste)))))
13:20	gfredericks	I think that's basically what you're describing; I have no idea what race condition hiredman is referring to
13:20	emaczen	gfredericks: Thanks very much!
13:20	hiredman	(swap! state update-in [:waste :foundation] rest conj (first waste)) is grabing the first of waste out side of the swap, so it isn't part of the case, so waste in the atom could change
13:21	hiredman	cas
13:22	hiredman	assuming this is in some kind of let like (let [{:keys [waste]} @state] ....)
13:25	gfredericks	ah yeah; I tripped up on passing conj to rest and didn't bother interpreting the code any further :)
13:25	gfredericks	emaczen: hiredman is right you definitely want to be careful to do all the reading inside the update function
13:25	gfredericks	which my code does
13:43	gfredericks	anybody know of anything similar to clojure.core/format but that accepts names instead of positional args?
13:44	gfredericks	I'm imagining another throwing helper (macro?) for catch-data that lets your errmsg strings reference values in your ex-data map
13:45	gfredericks	I know about strint in the incubator lib; that could sort of be twisted into the role but it's arbitrary eval so a little different
13:49	daGrevis	i'm trying to make a test setup that creates two browser instances and passes them to test each time. this is what i have so far, but it seems that deftest have no mechanism to accept params. :( https://gist.github.com/b072e75c3a3453723a5d
14:17	crack_user	hello guys
14:26	cap10morgan	given that clojure.lang.Keyword is not part of the public API, what is the idiomatic way of converting a clojure.lang.Keyword into a java.lang.String from Java code?
14:27	jjttjj	I have a bunch of data i need to pull from various APIs and store somewhere persistant and query somehow with clojure. It's just to figure out my taxes and i want it to be quick/easy/hacky as possible. Does this sound like a case for mongo or is there anything better? Anything that lets me just persist clojure structures without dealing with file io?
14:32	hiredman	filesystems are a thing these days
14:35	delaney	so i've been learning a bit of clojure in my spare time. something that I can't quite grok. is there a way to de/serialize persistent data structures? for example have a map, add/remove keys and store both versions to edn/fressian/etc. how do you deserialize back to the shared/persistent state where they share most of the same memory space?
14:36	LauJensen	Gents - Ive updated to the most recent version of cider, and now C-M-x no longer drops the result of eval in the repl. Is that intentional or have I borked a setting?
14:36	chouser	delaney: generally, you don't.
14:37	delaney	hmm, i was a afraid of that
14:37	delaney	once you save/load you lose a lot of the benefits it seems
14:37	chouser	if you use normal serialization (edn, fressian, transit) you'll get one version, and when you read it back in you'll get a whole new unshared data structure
14:37	delaney	right
14:38	delaney	is there (not 'normal)?
14:38	delaney	:P
14:38	delaney	like a memory dump
14:38	chouser	sure, you can serialize the operations applied to a value instead
14:38	delaney	so a transaction log
14:38	chouser	yup
14:40	chouser	then you could tag various versions in the transaction log, and when deserializing grab references to those tagged version. Once thats done, those tagged versions would share the memory for their common sub-values.
14:40	delaney	i work mostly in C# and trying to justify time towards clojure, but in practice having a hard time. i love the theory of it but most of the concrete examples seem easier there. sure part of it is familiarity.
14:41	chouser	immutable values have benefits, even in contexts where you don't get structural sharing
14:41	delaney	well yeah, but i already do that in C#
14:41	chouser	in fact, structural sharing isn't really a benefit so much as an attempt to reduce the cost
14:41	delaney	but more from convention than lang level granted
14:42	chouser	ah, well, if you've already got immutability and high-order functions, that is indeed a couple of major talking points removed in an argument for clojure
14:42	delaney	but there is no D in stm's acid beyond things like datomic it seems
14:42	chouser	let's see, what's left -- immutable locals, s-expressions (macros), ...
14:43	delaney	yeah i like the idea of Om, which is what got me interested in clojure (already using react from js land)
14:45	agarman_	C# is a good language, especially as unnecessary syntax keeps getting pruned away each release
14:46	delaney	agarman_: right. if it was a while ago then yeah there is a big diff (and being tied to jvm for sure). maybe its also when looking at the clojure examples or tutorials it just is crazy terse to grok
14:46	delaney	the syntax is simple, the complexity moves into the function calls
14:47	delaney	again hopefully that melts away with time
14:47	delaney	i love the idea of having the same lang server and client side for sure, and edn seems slicker than json for my wants
14:49	agarman_	if you have an opportunity to learn F#, and force yourself to not use mutable (mostly records, tuples & object expressions) you'll have most of the big benefits of Clojure.
14:51	delaney	well i've always loved the jvm's speed, just not the root lang. the clojurescript and even closure-clr makes it seem like there is something there i just don't quite see yet. in no way was it trying to avoid clojure, if anything seeing if i'm just approaching it wrong.
14:51	agarman_	Clojure's atoms & refs are nice though. core.async is great too.
14:55	agarman_	Even though C# & F# have syntax trees, reflection emit & reified generic containers these are poor substitutes for a good macro system.
14:59	delaney	i sounds dumb but i can't see my need for macros. i know there are canonical examples like (what if you want to write 'if')
14:59	delaney	i see they help you basically write compilers, but for the stuff i do it seems weird
14:59	LauJensen	Gents - Ive updated to the most recent version of cider, and now C-M-x no longer drops the result of eval in the repl. Is that intentional or have I borked a setting?
15:00	delaney	like you can't write a macro that does matrix math faster by preprocessing
15:02	agarman_	delaney: C# delegates are all syntactic sugar put in by the special logic in the compiler. If you had macros in C#, you could write that.
15:03	agarman_	delaney: C# async methods, dynamics, var & many many other items are written as changes to the C# compiler. These could all be done via a library if C# supported macros.
15:04	delaney	i get that, but those constructs are there now. could you write a macro that does that transaction log thing i was talking about before.
15:04	delaney	take every map/array function and throw into a transact log?
15:06	amalloy	delaney: for one thing, the compiler would be a lot simpler if it didn't have to include that stuff, and could let macros do it instead
15:06	amalloy	but if you are looking for a simple useful example, i offer https://github.com/amalloy/useful/blob/96f665/src/flatland/useful/map.clj#L6
15:06	amalloy	so that you can write (keyed [x y z]) instead of {:x x, :y y, :z z}
15:07	agarman_	delaney: you can do a write to transact log in Clojure but you'd usually do it by wrapping the vars that make the changes rather than writing macros
15:10	agarman_	but that logs operations on map/vector functions instead
15:13	delaney	so why wouldn't you do as a macro?
15:18	agarman_	it may be implemented with macros, but the better usage would be to (transact-log/start) and have that rewrite the vars for the functions that are relevant. So when someone calls (conj ...), (map ...), etc you get your transaction log written without having to change existing calls. It's like AoP but with all of your language already in an IOC container
15:18	amalloy	i don't know that a mass modification of vars is really such a great solution either...
15:19	agarman_	amalloy: It would terrify me.
15:20	agarman_	for debugging purposes, not so scary.
15:20	amalloy	i disagree. conj and map are called a lot. i'd be surprised if you could even get meaningful debug output by modifying their vars, given how much they're called by the standard library
15:20	amalloy	like, map calls map
15:21	agarman_	true
15:22	amalloy	well, at least java's logging libraries let you turn on debug logging for particular classes/packages individually
15:23	agarman_	yep
15:23	agarman_	that was an accident of trying to use matthias's inspect library on a piece of clojure in the big Java app
18:25	emaczen	can you multi-method dispatch on just keywords?
18:26	arrdem	sure if your dispatch operation is clojure.core/identity
18:26	emaczen	I'm thinking if my user clicks on two places, then I can make a set of functions for each two-combination
18:27	emaczen	arrdem: can you give me an example?
18:28	emaczen	I'm very new to this
18:28	arrdem	yeah sure one minute
18:31	arrdem	emaczen: https://www.refheap.com/98087
18:31	arrdem	emaczen: is that helpful?
18:31	emaczen	arrdem: Thanks, I will try this out
18:32	emaczen	how will this work for pairs?
18:32	emaczen	pairs of keywords?
18:33	arrdem	emaczen: the dispatch-fn is applied to all arguments.
18:33	arrdem	emaczen: so try invoking that function with a pair [:foo :bar]
18:34	emaczen	For this line: (defmethod identity-dispatch :foo [foo] "Got a foo!")
18:35	emaczen	what is the type of foo inside the [] ?
18:35	arrdem	emaczen: foo is simply a symbol naming the value of the 1st and in this case only argument.
18:41	emaczen	arrdem: I keep getting 'No method in multimethod 'pop-pushable?' for dispatch value: [nil
18:41	emaczen	nil];
18:41	emaczen	how do I call these methods exactly?
18:41	emaczen	I'll try wrapping them in a vector first
18:42	emaczen	That didn't work either
18:42	arrdem	emaczen: can you give me a sample input pair?
18:43	arrdem	emaczen: (pop-pushable :foo :bar) or (pop-pushable [:foo :bar])
18:43	emaczen	I tried both of those
18:44	arrdem	emaczen: in the form (defmethod identity-dispatch :foo [foo] "Got a foo!") the keyword :foo is the dispatch value for which the method tail returning the strung (fn [foo] "Got a foo!") will be invoked.
18:44	arrdem	emaczen: when you invoke a dispatch identity multimethod with the pair [:foo :bar], you need to have a method registered for that pair.
18:45	arrdem	bah I'm sorry I'm doing this wrong.
18:45	arrdem	emaczen: can you refheap what you have now?
18:46	emaczen	arrdem: Sure, I am trying to make a klondike solitaire game
18:46	emaczen	Can you look at a pastebin?
18:46	arrdem	sure
18:49	emaczen	arrdem: http://paste.lisp.org/+34P1.
18:50	emaczen	arrdem: do you get the idea?
18:50	arrdem	emaczen: yeah.
18:51	arrdem	emaczen: (waste @state) could be :waste, unless there's more code you didn't paste.
18:51	justin_smith	emaczen: the args to your defmulti and your defmethod don't agree in arity
18:52	justin_smith	arrdem: based on the dispatch it would have to be (::waste @state), which looks like it would always be nil
18:53	arrdem	Ah. @justin_smith yeah I see the arity missmatch.
18:53	emaczen	What is the arity mismatch?
18:54	justin_smith	emaczen: your multi takes one arg, the method you create for it takes two
18:54	justin_smith	identity isn't a two argument function, but your defmethod is
18:54	emaczen	I'm not even sure why the multi takes one.... All I did was make the dispatch function be identity
18:54	arrdem	emaczen: if you dispatch on the _pair_ [::waste ::foundation], you have only given the body one argument.
18:54	justin_smith	emaczen: and identity takes two arguments
18:55	justin_smith	emaczen: you could change your dispatch function to be vector
18:55	justin_smith	and then the arities would work
18:55	justin_smith	(defmulti pop-pushable? vector)
18:55	justin_smith	because you can call vector on two args, and it returns the two args such that you can dispatch on them
18:56	justin_smith	or maybe list would be better, it would work the same either way
18:57	arrdem	justin_smith: dispatching on first should be fine...
18:57	arrdem	justin_smith: in case you want non-constant args elsewhere :P
18:57	justin_smith	arrdem: he matches on two args though
18:57	emaczen	give me a few seconds/minutes -- I am following, but I know this is going to take me a little bit of time to get to work
18:57	arrdem	justin_smith: (foo [dispatch-a dispatch-b] . args)
18:57	amalloy	arrdem: (first x y) doesn't return x
18:58	arrdem	amalloy: correct me if I'm wrong, but I thought that multimethods did (<dispatch-fn> (seq args))
18:58	arrdem	not (apply <dispatch-fn> args)
18:58	amalloy	arrdem: that is wrong
18:59	amalloy	the dispatch fn receives exactly the same args as the method does
19:00	justin_smith	arrdem: emaczen: https://www.refheap.com/98090
19:00	justin_smith	that's how you dispatch on two arguments
19:00	arrdem	"This function will be applied to the arguments to the multimethod in order to produce a dispatching value."
19:00	arrdem	gotcha.,
19:00	arrdem	on clojure.org/multimethods but not in the docstring. right.
19:00	emaczen	justin_smith: cool!
19:01	emaczen	I have a new question now...
19:01	emaczen	I want to dispatch on these two keywords and an integer
19:01	emaczen	err wait
19:01	emaczen	sorry
19:02	justin_smith	(fn [a b & optional] [a b])
19:02	justin_smith	it will dispatch on the first two, and the multi itself will get all the args
19:02	emaczen	I just want the integer to be an argument to the function
19:02	justin_smith	they are all arguments
19:03	justin_smith	for clarity, when I said "the multi itself" I mean the form defined in defmethod, that was badly worded
19:03	emaczen	Wait, (defmethod foo [:a :b] [a b i] ... )
19:03	justin_smith	right
19:04	emaczen	cool!
19:04	justin_smith	that would work with the dispatch function I shared above
19:04	justin_smith	because the dispatch just checks the first two args, ignoring the rest
19:04	dfletcher	Ahhh sweet. UI editable with WindowBuilder, main program logic in Clojure. This is what I was after, thanks for the help earlier channel :)
19:05	justin_smith	emaczen: updated the paste to show optional args on a defmulti https://www.refheap.com/98090
19:06	justin_smith	dfletcher: sounds cool, I would like to read it
19:07	emaczen	justin_smith: sweet
19:10	emaczen	how do I remove a defmulti definition from the REPL
19:10	rufoa	you can use interop to do (.addMethod
19:10	rufoa	so perhaps similar
19:11	rufoa	look in clojure.lang.MultiFn
19:11	arrdem	$grim clojure.core/remove-all-methods
19:11	lazybot	http://grimoire.arrdem.com/1.6.0/clojure.core/remove-all-methods
19:11	justin_smith	emaczen: it is a def, you can do (def multi-fn-name nil)
19:11	arrdem	$grim clojure.core/remove-method
19:11	lazybot	http://grimoire.arrdem.com/1.6.0/clojure.core/remove-method
19:11	dfletcher	heh oops justin_smith wrong chan. #eclipse helped me figure out how to make this work ;)
19:11	justin_smith	haha
19:11	justin_smith	OK
19:11	justin_smith	dfletcher: is it a clojure thing at all?
19:12	emaczen	arrdem: doesn't that just remove all the methods of the multi?
19:12	arrdem	emaczen: remove-method can remove the method associated with a specific dispatch value.
19:12	dfletcher	my main program logic is in clojure and i pass a window to my clojure main (that was built using some nice gui tools in Eclipse [WindowBuilder])
19:12	justin_smith	emaczen: arrdem: to remove the mutli altogether just do (def your-multi nil)
19:13	justin_smith	*multi
19:13	dfletcher	actually heh maybe I don't even want to pass the window here. but as a test (.show window) is working nicely :>
19:13	emaczen	thanks!
19:13	justin_smith	this is needed in order to redefine multis, because they are defonce
19:14	justin_smith	that's a trick I learned from technomancy, hope he joins us here again some day
19:15	emaczen	isn't technomancy on #emacs a lot?
19:15	justin_smith	yeah, he seems to be taking a break from this channel
19:16	amalloy	$karma technomancy
19:16	lazybot	technomancy has karma 162.
19:16	godd2	I just ordered his keyboard a week and a half ago. can't wait to solder that together
19:18	godd2	This one, if anyone's interested: http://atreus.technomancy.us/
19:23	emaczen	justin_smith: I'm still struggling and I'm following your example practically to a tee
19:23	justin_smith	emaczen: is there a specific thing that isn't working?
19:24	emaczen	I'll make a paste
19:26	emaczen	https://www.refheap.com/98091
19:26	emaczen	I am calling the method like: (pop-pushable? [::waste ::foundation] 2)
19:27	justin_smith	emaczen: why the vector?
19:27	justin_smith	(pop-pushable? ::waste ::foundation 2)
19:27	justin_smith	should work with the definitions you have there
19:27	emaczen	I tried it like that too and it still says wrong number of args
19:28	emaczen	I'm going to try restarting my repl
19:28	justin_smith	did you do (def pop-pushable? nil) before redefining the defmulti?
19:29	justin_smith	because just running defmulti again will not replace the old dispatch
19:29	justin_smith	it's varargs, it should only complain about argument count if you provide less than 2 args
19:29	emaczen	justin_smith: yeah, I didn't set it to nil
19:30	justin_smith	$source defmulti
19:31	lazybot	defmulti is http://is.gd/nhS5dG
19:31	justin_smith	emaczen: look at the when-not near the bottom of the definition of defmulti
19:31	justin_smith	it doesn'
19:31	justin_smith	t do anything if the multi is already a multi
19:31	justin_smith	so assigning to nil explicitly is needed in order to redefine the dispatch
19:32	justin_smith	well, asigning to anything that is not a multimethod, or deleting the var itself from the namespace
19:32	justin_smith	but the former is easier
19:33	emaczen	I get a null pointer exception now
19:34	justin_smith	you need to redefine the multifn and it's methods after assigning to nil
19:34	emaczen	justin_smith: I think this is actually in the definition of my multi-method... lol
19:34	emaczen	I'll keep playing with it
19:34	justin_smith	oh, OK then :)
19:35	justin_smith	here's a funny one:
19:35	blake_	Can map return a map? =P
19:35	justin_smith	,(nth nil 2)
19:35	clojurebot	nil
19:35	justin_smith	,(nth () 2)
19:35	clojurebot	#<IndexOutOfBoundsException java.lang.IndexOutOfBoundsException>
19:36	justin_smith	blake_: you can use (into {} (map ...))
19:36	justin_smith	that makes the map eager of course, because {} cannot be lazy
19:36	blake_	justin_smith: Sure, I was just noting the lexical oddity.
19:36	justin_smith	ahh, OK
19:36	justin_smith	yeah, that bugs me sometimes
19:37	blake_	Homophones, man. How do they work?
19:37	amalloy	obviously we should just call them dictionaries
19:37	amalloy	i think these are actually hononyms, right, not just homophones
19:37	justin_smith	,(def territory {})
19:37	clojurebot	#'sandbox/territory
19:37	blake_	Yes. There's also "associative arrays", though 'tis cumbersome.
19:37	justin_smith	amalloy: homonym
19:38	justin_smith	oh, they are homophones too
19:38	justin_smith	as many homonyms are
19:38	blake_	justin_smith: All homophones are homonyms. No, strike that, reverse it.
19:38	blake_	ALl homonyms ar ehomophones.
19:38	amalloy	blake_: injective cartesian relations
19:38	justin_smith	there are homophones that are not homonyms
19:38	justin_smith	there are homonyms that are not homophones
19:38	justin_smith	like read
19:38	blake_	amalloy: That's good jargon!
19:38	justin_smith	that is homonym but not homophone
19:39	blake_	justin_smith: Well, but not at the same time.
19:39	emaczen	clojure.core/swap!
19:39	emaczen	([atom f] [atom f x] [atom f x y] [atom f x y & args])
19:39	amalloy	blake_: huh?
19:39	blake_	justin_smith: If you're saying "red" and "reed", they're no longer homonyms (or homophones).
19:39	justin_smith	I'm just saying, all four options are available: a, b, both a and b, neither a nor b
19:39	emaczen	What do the the different vectors [atom f] [atom f x] mean?
19:40	justin_smith	blake_: I mean "I read it" and "I will read it"
19:40	emaczen	different possible inputs?
19:40	emaczen	method overloading I mean?
19:40	justin_smith	emaczen: possible arities of a function
19:40	blake_	amalloy: lol, sorry, I thought you were suggesting "injective cartesian relations" as a new way of saying "map".
19:40	justin_smith	emaczen the only kind of overloading we have is argument count
19:40	amalloy	blake_: i was
19:40	amalloy	i'm objecting to your homonym/homophone claims
19:41	amalloy	justin_smith: lead and lead are probably a better example, since read and read have similar origins/meanings
19:41	justin_smith	much better example, thanks
19:41	blake_	amalloy: Homophones include homonyms, if I'm not mistaken. Homonyms are homophones that are spelled the same.
19:41	amalloy	blake_: no. homophones are pronounced the same (as the -phone suffix suggests)
19:41	justin_smith	blake_: no, I already explained
19:42	amalloy	homonyms are spelled the same
19:42	justin_smith	some homophones are homonyms, but not all, some homonyms are homophones, but not all
19:43	amalloy	what i don't quite get is the difference between a homonym and homograph
19:43	blake_	Mmmmmm. OK, we're using different definitions. "lead" and "lead" are homographs.
19:43	justin_smith	blake_: these words are in the dictionary
19:44	blake_	Sorry, this is my default:
19:44	blake_	In non-technical contexts, the term "homonym" may be used (somewhat confusingly) to refer to words that are either homographs or homophones.
19:44	blake_	http://en.wikipedia.org/wiki/Homonym
19:44	justin_smith	blake_: homograph is a synonym for homonym
19:44	blake_	I recommend that page there.
19:45	emaczen	what does {:keys [some variable]} do?
19:45	justin_smith	emaczen: argument destructuring by keyword
19:45	justin_smith	,(let [{:keys [a b]} {:a 1 :b 2}] (+ a b))
19:45	clojurebot	3
19:46	justin_smith	blake_: fascinating, I didn't realize that more technical definition existed
19:47	blake_	justin_smith: Yeah. It actually is a lot better than the common definition, which causes much confusion.
19:47	justin_smith	(inc blake__
19:47	justin_smith	err
19:47	justin_smith	(inc blake_)
19:47	lazybot	⇒ 1
19:47	blake_	(Or, when some jackass uses the non-common definition without quailfying.)
19:47	justin_smith	wat
19:47	blake_	lol
19:47	blake_	I lost my braces.
19:47	blake_	(inc {blake})
19:47	lazybot	⇒ 2
19:47	blake_	lol
19:47	blake_	THE LOOPHOLE!
19:48	justin_smith	what was that unicode? I am in a tty and I just got a replacement character
19:48	justin_smith	(identity blake_)
19:48	lazybot	blake_ has karma 1.
19:49	emaczen	,(def m {:a 1 :b 2 :c 3})
19:49	clojurebot	#'sandbox/m
19:49	emaczen	(update-in m :a (fn [x] (+ x 1)))
19:49	emaczen	,(update-in m :a (fn [x] (+ x 1)))
19:49	clojurebot	#<UnsupportedOperationException java.lang.UnsupportedOperationException: nth not supported on this type: Keyword>
19:50	emaczen	why doesn't that work?
19:50	justin_smith	emaczen: [:a]
19:50	amalloy	emaczen: you are forgetting the brackets again
19:50	emaczen	thanks guys!
19:56	blake_	For finding all the unique keys in a sequence of maps "(keys (apply merge x1))". Tacky?
19:59	emaczen	I need to update two lazySeqs in an atom -- I want to remove the first element of one of the lazySeqs and conjoin it to the front of the other.
19:59	emaczen	Can you guys give me some advice?
20:00	emaczen	swap! only takes one function
20:00	amalloy	emaczen: write a pure function that takes in two lazy seqs and returns two new ones
20:00	amalloy	forgetting about the atom entirely
20:00	amalloy	then, once that works, adapt it to your atom
20:04	emaczen	amalloy: I made my function, now how do I correctly pass the arguments?
20:04	justin_smith	it should have exactly one argument
20:05	emaczen	(defn pop-push [l1 l2] [(rest l1) (conj l2 (first l1))])
20:05	emaczen	That is my function
20:05	amalloy	emaczen: what is in your atom, and what does your function look like?
20:06	emaczen	amalloy: there are two lazySeqs (lists) in the Atom that are relevant for pop-push
20:06	amalloy	emaczen: write your function so that it takes as input exactly whatever object is currently in the atom. like, how are you storing two things in one atom? as a list? then your function should take a list and return a list. as a map? then your function should take a map and return a map
20:07	emaczen	amalloy: The atom is a map
20:12	vas	Hi. I want to have short-ids for a bunch of posts that live in a datomic database. I am thinking maybe I can devise a hash function that will figure out the entity ID from the letters and numbers of the short ID (for example, 17592186045438 would map to a667qq2 or some such). Is this a reasonable approach?
20:13	justin_smith	vas: what would you do to handle collisions?
20:14	emaczen	amalloy: The two lazySeqs (lists) are values in the map?
20:14	emaczen	(defn pop-push [l1 l2] [(rest l1) (conj l2 (first l1))])
20:14	vas	justin_smith: excellent point. does it make more sense to add a unique identifier "on the fly" to the datomic entities?
20:14	vas	(and maybe just go incrementally?)
20:15	justin_smith	vas: that would likely be simpler
20:15	vas	you got some good words in them fingers. thanks yet again friend
20:16	justin_smith	unless there is some clever scheme for short IDs that handle collisions elegantly (for all I know there might be), in which case use that of course
20:16	justin_smith	I try
20:16	emaczen	amalloy: should pop-push take a map? Or should it take two lists?
20:16	amalloy	emaczen: it should take exactly what is in your atom
20:16	justin_smith	emaczen: if you want to update a map, have it take a map
20:18	emaczen	I'm trying to use swap!
20:18	emaczen	So I am trying to make the function that swap! takes
20:18	justin_smith	in that case, have it take a map, and return one
20:19	emaczen	justin_smith: I will try that
20:22	emaczen	(defn pop-push [m]
20:22	emaczen	(update-in m [:waste] (fn [] (conj (first (:deck @state)) (:waste @state))))
20:22	emaczen	(update-in m [:deck] rest))
20:22	emaczen	Oops
20:22	justin_smith	emaczen: that would work if you chained it using ->
20:22	emaczen	I'll make a paste for this
20:22	amalloy	emaczen: remember, this is a pure function. it doesn't take in an atom of a map, but a map
20:23	amalloy	justin_smith: no, there are at least two other things wrong
20:23	justin_smith	yes, you are right
20:24	amalloy	emaczen: try what i was suggesting: forget about the atom entirely. (def sample-map '{:waste (1 2 3) :deck (4 5 6)}), and then write a function that takes in sample-map and returns a new map the way you want it
20:24	emaczen	so I removed, the dereferencing
20:24	amalloy	once you have that, the atom will be super-easy to add
20:25	justin_smith	emaczen: you want no reference to the state global
20:25	justin_smith	just use the map that gets passed in
20:25	emaczen	Okay, let me try this again
20:25	ludbek	does anyone here know how to use clojurescript for meteor development?
20:26	godd2	ludbek quick google leads to meteor-clojurescript: https://github.com/mystor/meteor-clojurescript
20:27	emaczen	(defn pop-push [m]
20:27	emaczen	{:waste (conj (:waste m) (first (:deck m)))
20:27	emaczen	:deck (rest (:deck m))})
20:27	emaczen	How about that?
20:27	ludbek	@godd2, i tried it, but the compiled code some 27k big
20:27	ludbek	@godd2 is it supposed to be so?
20:28	justin_smith	emaczen: if you use -> chained update-in, (or at least a merge) it would work even if you added more keys to the map
20:28	amalloy	emaczen: that looks pretty good to me
20:28	godd2	ludbek No clue. You might be able to tweet ben orenstein and ask him. I know he does a lot of clojurescript as of late
20:28	justin_smith	emaczen: it's really common to add keys to a map, so code that needs to be edited to add the extra keys is often regretted
20:28	amalloy	emaczen: that function should now just work: (swap! some-atom pop-push)
20:29	emaczen	justin_smith: I'll try the chained variant once this works
20:30	emaczen	amalloy: Thanks so much! This should take me pretty far :D
20:32	ludbek	@godd2 thanks
20:45	emaczen	justin_smith: the other function that I was asking about first works too :)
20:45	emaczen	thanks so much guys!
20:46	gfredericks	does anybody know of an approach to using schema or something similar to describe coersions as well as vanilla schemas?
20:49	justin_smith	emaczen: it shouldn't, unless the update-ins are chained with ->
20:49	justin_smith	emaczen: or is that what you mean?
20:50	emaczen	I'm not using update-ins.
20:51	justin_smith	oh, I thought that was what you meant by the other function
20:51	emaczen	(fn [m]
20:51	emaczen	{:waste (conj (:waste m) (nth n (:deck m)))
20:51	emaczen	:deck (nthrest (:deck m) n)})))
20:51	emaczen	I'm doing that
20:51	emaczen	other function refers to the multi-method questions I had earlier
20:51	justin_smith	oh, OK
21:02	emaczen	how can I get the first 3 elements of a list?
21:02	emaczen	Is there a function like nthrest?
21:02	justin_smith	(take 3 l)
21:03	emaczen	cool!
21:04	amalloy	nthrest is the opposite, it would remove the first 3
21:04	justin_smith	when would you use nthrest instead of drop?
21:05	amalloy	probably never. but they have different laziness characteristics
21:05	justin_smith	where drop is lazier?
21:05	amalloy	so in theory you might have situations where you'd prefer nthrest
21:05	amalloy	yeah
21:15	xapak	Hello.
21:17	xapak	I’m new to Clojure (I may have tried it before, but this time is for real), and I’d like to know what projects do you recommend to check their source code for “elegantness” and “succinctness”. I’ve been tasked to do a CLI, but also the library part of it (functional), so I’d like to follow some code guideliness besides just the Best Practices on “paper”.
21:20	emaczen	justin_smith: how can I define two optional paramters to a multi?
21:21	emaczen	I tried just adding another argument as well placing another &
21:34	justin_smith	all the args after the first two are put in one collection
21:35	justin_smith	,((fn [& args] args) 1 2 3 4)
21:35	clojurebot	(1 2 3 4)
21:35	emaczen	is it treated as var args or as a list inside the function?
21:36	justin_smith	it is var args, which means that inside the function it is a list
21:36	emaczen	There isn't another way to do it?
21:36	justin_smith	you can use destructuring
21:36	justin_smith	but that's just destructuring the list
21:37	justin_smith	,((fn [& [a b c]] c) 1 2 3)
21:37	clojurebot	3
21:37	emaczen	justin_smith: cool! I'm happy with that
21:51	skynet9001	is there a good way to see out of date dependencies in a lein project?
21:52	gfredericks	lein ancient
21:52	gfredericks	which might be a plugin
21:52	skynet9001	thanks
21:52	gfredericks	np
21:53	xapak	I’ll ask again in case it was missed:
21:53	xapak	I’m new to Clojure (I may have tried it before, but this time is for real), and I’d like to know what projects do you recommend to check their source code for “elegantness” and “succinctness”. I’ve been tasked to do a CLI, but also the library part of it (functional), so I’d like to follow some code guideliness besides just the Best Practices on “paper”.
21:55	justin_smith	xapak: flatland/useful, the various ring libraries, pretty much anything from prismatic
21:56	xapak	Prismatic... I seem to have heard or something from them before.
21:56	xapak	justin_smith, awesome, thanks. :)
21:56	justin_smith	xapak: they make schema, plumbing, and graph
22:05	skynet9001	anyone here use the chestnut webapp template?
22:20	skynet9001	I'm getting "ReferenceError: goog is not defined" after using lein ring uberwar on a chestnut project and deploying on tomcat, any ideas?
22:21	justin_smith	skynet9001: how are you building your cljs? are you turning on optimizations?
22:22	skynet9001	justin_smith: looks like :optimizations :none
22:23	justin_smith	try running 'lein with-profile -dev,+uberjar cljsbuild once' before making the uberwar
22:26	skynet9001	will try that, thanks
22:31	skynet9001	so that didn't work, but I'm looking at the /public/js/ directory and it's missing the out.js.map file, although I have :sourcemap "resources/public/js/out.js.map" defined in the cljs build
22:32	skynet9001	I don't see the resources/public/js/out.js.map file in the project, how do I create it?
22:42	justin_smith	cljsbuild should create that. maybe cljsbuild clean then build again?
23:03	skynet9001	still nothing, weird
23:03	skynet9001	I had it working on another machine earlier today, maybe something's misconfigured on this vm
23:04	skynet9001	this is all just the base chestnut template
23:07	justin_smith	I don't see what vm config could break chestnut
23:08	skynet9001	I think on this one I had installed openjdk 8 before installing 7, maybe that had something to do with it
23:08	skynet9001	gonna try a fresh start
23:20	Guthur	Hi, I'm trying to create my own leningen template standard-project. I created the project with lein new template standard-project editted it and then ran lein install
23:20	Guthur	there were no errors but when I try to use my template with lein new standard-project foo it gives the following...
23:20	Guthur	Failed to resolve version for standard-project:lein-template:jar:RELEASE
23:21	Guthur	any suggestions?
23:27	ddellacosta	is there a reason to use atoms vs. dynamic vars for configuration of libs?
23:27	ddellacosta	or even something else?
23:33	justin_smith	ddellacosta: a global atom will usually limit how a lib can be used
23:35	ddellacosta	justin_smith: so, if I make configuration an atom, that's going to ensure that/restrict it so that the configuration is accessible across threads, no?
23:35	ddellacosta	vs. dynamic vars being thread-local--that's the big distinction, am I right?
23:35	justin_smith	I think the cleanest is the c.j.jdbc approach of a configuration arg, that a client can esaily partially apply
23:38	justin_smith	yeah, an atom means a global config, dynamic vars, thresd local, configuration argument is lexically scoped
23:38	ddellacosta	justin_smith: trying to understand what you mean here--you're talking basically about config always getting passed in as fn args, basically?
23:38	ddellacosta	justin_smith: in reference to c.j.j being ideal
23:38	ddellacosta	(if that's the case would agree)
23:38	justin_smith	a map ad the first arg, yeah
23:39	justin_smith	the first, because we have partial
23:43	justin_smith	the atom and dynamic var versions can be implemented by the end user in two lines of code
23:43	justin_smith	(given the explicit argument version existing, and taking the config as the first arg)
23:44	justin_smith	the others are not so flexible