#clojure – 2013-03-02

2013-03-02

00:00	TimMc	I thought perhaps I had put a board in the wrong place somewhere.
00:20	tyler_	anyone know if you can call functions from clostache?
00:20	tyler_	in the view
00:20	tyler_	ah you can call lambas nice
00:21	tyler_	n/m
00:21	tyler_	found it
00:29	Frozenlock	Is there a way to unquote-splice inside a for? (for [x some-list] (or x [1 2 3])) ----> (x x x 1 2 3 x x)
00:30	tomoj	I think I usually (apply concat (for [x some-list] (if x [x] [1 2 3]))) :(
00:30	tomoj	hmm
00:30	tomoj	(for [x some-list y (if x [x] [1 2 3])] y) ?
00:31	Frozenlock	o_O
00:31	Frozenlock	Never used `for' with more than a coll.
00:33	Frozenlock	Looks like it could work, thanks :)
00:56	leku	how do I work with .jar files and clojure?
00:56	leku	I'd like to be able to play around with this API and teach myself a little clojure at the same time
00:56	leku	(require '(USGS jar [set :as u]))
00:56	leku	not working
00:58	leku	a stackoverflow page suggests putting it int he lib folder
00:59	leku	i created a new project with lein but there is no lib dir
01:07	tomoj	which stackoverflow page?
01:07	tomoj	leku: https://github.com/technomancy/leiningen/wiki/Repeatability
01:07	tomoj	lib/ doesn't exist anymore in lein 2
01:08	leku	ah
01:08	leku	ahh
01:08	leku	i see what they did here
01:08	tomoj	if the jar isn't in a maven repo you can access already, you'll have to either put it in one or use lein-localrepo or whatever
01:08	leku	rgr
01:33	yedi	is clj-stripe the only stripe wrapper lib?
01:39	xeqi	yedi: I've been using clj-http to hit the api directly for a recent project
01:40	xeqi	those were the two choices I found
01:40	yedi	theres no wrapper over javas native library?
01:47	xeqi	you could just inerop with it, but I didn't find it very nice when I tried
01:47	xeqi	*interop
02:19	Frozenlock	"Cannot recur from catch/finally" Damn
03:06	Deece	I'm a bit confused by function literal syntax. I would have thought that #(%) was equivalent to (fn [x] x), but it's equivalent to (fn [x] (x)). maybe I'm crazy, but this seems odd?
03:12	noidi	Deece, it's very rare for an anonymous function to not call another function, so mostly you'd end up with double parens #((...))
03:18	leku	how do I connect my emacs to the repl?
03:18	leku	so that when I save I can run new functions in the lein repl?
03:23	noidi	leku, maybe this guide could help? http://clojure-doc.org/articles/tutorials/emacs.html
03:25	leku	thx
03:39	leku	perfect noidi
03:39	leku	thank you
03:50	babilen	Just seen that maps (in addition to vectors) are now mentioned as being used with fork/join -- Does that also mean that reducing into maps is fast(er) now?
03:50	babilen	(yeah, you guessed correctly this is about the reducers library)
04:00	fsvehla	Can the reducers library work with a line-seq as a input? Order doesn’t matter for the fold, and the source should be able to be read much faster than all the following steps
04:02	tomoj	you can r/reduce over any seq, but you can't r/fold
04:03	tomoj	you would have to create your own IO folder
04:03	tomoj	well
04:03	tomoj	if you just slurp the line-seq into something foldable, you can fold that...
04:08	tomoj	hmm, it seems you could define a partition folder over seqs?
04:13	tomoj	but it wouldn't be fork/join suitable?
04:26	leku	how do I switch namespaces?
04:26	leku	in my nREPL
04:27	leku	just (ns foo) ?
04:28	borkdude	leku (in-ns 'foo)
04:29	borkdude	leku from the docs I see it has the same effect if the namespace already exists
04:30	borkdude	leku in-ns is more low level
04:30	leku	(ns foo) seemed to work
04:30	leku	this emacs tutorial says to do C-c C-n
04:30	leku	can't seem to get that to work
04:30	borkdude	hmm, interesting (macroexpand '(ns foo))
04:30	borkdude	leku ns also refers clojure.core for you etc
04:31	leku	cool
04:31	Raynes	I've never used in-ns in my live.
04:31	Raynes	leku: C-c M-n
04:33	leku	ahH!!
04:33	leku	that works thanks
04:33	Raynes	life*
04:33	Raynes	No probs.
04:37	leku	(macroexpand) is good
04:40	Raynes	macroexpand is much better than bed.
04:44	leku	https://github.com/relevance/clojure-conj/wiki/Clojure-conj-2012-Unsessions
04:44	leku	wtf? clojure powered robots??
04:44	lazybot	leku: Definitely not.
04:44	leku	when the first bot writes his own REPL, does that mean Skynet has come ONLINE?
04:44	Ember-	lazybot: you are wrong :)
04:44	borkdude	leku most of us are robots
05:38	augustl	hmm, intellij and la clojure will get weird syntax error warnings when I use "#db/id[:db.part/user -100]" which is perfectly legal Clojure code
05:50	leku	hm my compiler is complaining that clj-http.client is missing, yet I have it in my project.clj and lein deps is up to date
05:58	leku	how do I say if something exists, use that, otherwise use this?
06:00	Bodil	leku: (or something this)
06:01	Bodil	leku: Assuming that by "exists" you mean truthy.
06:01	leku	hm
06:01	augustl	leku: (get my-map :key default-value-here) if you mean a map
06:01	leku	well if arguments were passed to main I was gonna use that, otherwise use a default
06:01	augustl	I'd use or for that
06:02	leku	(defn -main [& args] (get-data (or (args) ("http://foo.com"))..
06:02	Bodil	Yes, missing arguments to main would be nil, so or is the way to go.
06:02	leku	k
06:02	leku	thx
06:02	Bodil	leku: (or args "http://foo.com")
06:02	Bodil	leku: Otherwise you're trying to call args as a function...
06:02	augustl	leku: that's too many parenthesis :)
06:02	leku	ah ok
06:02	augustl	and you want (first args)
06:02	leku	ah indeed
06:04	borkdude	,(clojure.xml/parse "http://www.w3schools.com/xml/note.xml")
06:04	clojurebot	#<ClassNotFoundException java.lang.ClassNotFoundException: clojure.xml>
06:05	borkdude	,*e
06:05	clojurebot	#<Unbound Unbound: #'clojure.core/*e>
06:18	mpfundstein	hello can someone help me with this? http://ideone.com/gmqWz7
06:18	mpfundstein	my question is that if i have a if-let statement
06:18	mpfundstein	how can i do two things afters
06:19	mpfundstein	(if-let [name (first waiting-line)]
06:19	mpfundstein	1. print name
06:19	mpfundstein	2. do something else with name
06:20	raek	mpfundstein: you can use 'do' to perform multiple actions in sequence
06:20	mpfundstein	is it like ->> ?
06:20	raek	no, it doesn't thread any value through the expressions
06:21	mpfundstein	thx
06:21	mpfundstein	do what was i was searching for
06:21	raek	it takes a bunch of expression, evaluates them left ro right, and then returns the result of the last one
06:21	borkdude	do is usually needed when side effects have to occur before returning a value
06:21	mpfundstein	borkdude: yeah, in my case just a println
06:22	mpfundstein	is there a function like slice( ) in javascript ?
06:22	mpfundstein	where i can slice a list/vector
06:22	borkdude	mpfundstein example input output?
06:22	mpfundstein	'("Markus", "Nina", "Anna")
06:22	mpfundstein	i want a new list
06:22	mpfundstein	with
06:22	raek	mpfundstein: in this case you should also use 'recur' instead of the 'process-next' after the println
06:22	mpfundstein	only ("Nina", "Anna")
06:22	Bodil	mpfundstein: You'd use drop for that.
06:23	borkdude	,(rest '("Markus", "Nina", "Anna"))
06:23	clojurebot	("Nina" "Anna")
06:23	raek	mpfundstein: 'rest' or 'next'
06:23	mpfundstein	Ah
06:23	mpfundstein	ok let me test
06:23	borkdude	mpfundstein in the context of recursion it is better to use next
06:24	raek	mpfundstein: if you don't use recur you will overflow the stack if you process long lists
06:24	borkdude	mpfundstein because it returns nil on empty collections
06:24	borkdude	,(rest [])
06:24	clojurebot	()
06:24	borkdude	,(next [])
06:24	clojurebot	nil
06:24	mpfundstein	ok
06:24	mpfundstein	so recur will call the current function again
06:24	raek	yes
06:24	mpfundstein	but reuse the stack ?
06:24	raek	exactly
06:24	mpfundstein	ah thats nice
06:24	mpfundstein	thanks
06:24	mpfundstein	(first hour in clojure)
06:25	borkdude	mpfundstein most of the time you can avoid recursion altogether by using higher order functions
06:25	raek	not bad for just one hour...
06:25	mpfundstein	recur symbol not found
06:25	mpfundstein	ah lol sorry
06:25	mpfundstein	forgot (
06:26	mpfundstein	ah awesome
06:26	mpfundstein	hehehe
06:26	mpfundstein	it works
06:26	mpfundstein	but one question
06:27	mpfundstein	this works perfect: http://ideone.com/X01WZV
06:28	borkdude	,(doseq [name '("dude" "bar" "foo")] (println name " is next"))
06:28	clojurebot	dude is next\nbar is next\nfoo is next\n
06:28	mpfundstein	ah question solved
06:28	mpfundstein	borkdude: hihi :-) yeah
06:28	mpfundstein	borkdude: i try to understand the language so i am building stupid test cases for myself
06:29	borkdude	mpfundstein no problem, doing good for just one hour :)
06:29	mpfundstein	(probably 2 already ;-) )
06:29	mpfundstein	i had yesterday the vision that i must learn a lisp like language now :D
06:30	raek	mpfundstein: in your code you are not really testing for the empty list, you are testing if the first thing in the list is nil
06:31	raek	of course an empty list does not have a first element, but clojure returns nil in that case
06:31	mpfundstein	raek: mh yeah, because it pops anway the first element each time
06:31	mpfundstein	raek: how would you write it?
06:31	raek	anyway, your function will stop on the first nil in the list
06:31	mpfundstein	let-if (= 0 (count waiting-list))
06:31	raek	mpfundstein: like this: https://www.refheap.com/paste/11997
06:31	mpfundstein	> 0 i mean
06:32	borkdude	or use next and test for argument = nil
06:32	mpfundstein	why if and not let-if
06:32	raek	sorry, that doesn't work
06:33	mpfundstein	no
06:33	mpfundstein	name is not defined than
06:34	mpfundstein	i could do
06:34	raek	mpfundstein: https://www.refheap.com/paste/11998
06:34	mpfundstein	yes precisible
06:34	mpfundstein	can one negate a if?
06:34	mpfundstein	(if (!emtpy?
06:34	mpfundstein	if-not probably :-)
06:34	raek	yeah
06:35	raek	but (empty? x) = (not (seq x))
06:35	raek	so (if (seq x) ... ...)
06:35	raek	or (when (seq x) ...)
06:35	mpfundstein	thanks
06:35	mpfundstein	when doenst have else
06:35	mpfundstein	?
06:35	mpfundstein	ok i go on with my stuff now :D too much n00bie questions popping up :-)
06:36	raek	yeah, (when c a b c) = (if c (do a b c) nil)
06:36	mpfundstein	thanks raek and borkdude
06:36	mpfundstein	kkk
06:36	raek	though (if c a) = (if c a nil)
06:36	borkdude	mpfundstein https://www.refheap.com/paste/11999
06:37	borkdude	mpfundstein the surrounding do can be ommitted
06:37	maxalwings	What is the best CSS DSL built in Clojure?
06:37	rcg	what's "more idiomatic": "(contains? #{:foo :bar} :foo)" or "(#{:foo :bar} :foo)"?
06:37	mpfundstein	ok ok
06:37	borkdude	so: https://www.refheap.com/paste/12000
06:37	mpfundstein	no it gets a bit tricky
06:38	rcg	when used, e.g., in a cond, both work.. but what's the preferred way to do it?
06:39	borkdude	rcg (if (#{:foo :bar} :foo) :yeah :no) is a pretty common pattern I think
06:41	rcg	borkdude, i see, thx
06:41	borkdude	rcg beware of this though: (if (#{nil :foo} nil) :yeah :no)
06:42	rcg	borkdude, sure :)
06:50	borkdude	I wonder where I can find the definition of nil as a value
06:54	borkdude	probably this thing? https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java#L1873
07:00	borkdude	hmm, clojure.lang.Compiler/NIL_EXPR => Unable to find static field: NIL_EXPR in class clojure.lang.Compiler
07:02	raek	borkdude: clojure nil (the value) is JVM "null". I guess you'd need to look in the JVM spec?
07:02	borkdude	raek is null a value in the JVM?
07:02	raek	yes
07:02	raek	it is a value that all reference types contain
07:03	borkdude	raek can I add null to a set in java?
07:04	raek	aconst_null in http://en.wikipedia.org/wiki/Java_bytecode_instruction_listings
07:04	raek	borkdude: you can certainly pass null to Set.add()
07:05	raek	some implementations might not allow null as an element, though
07:05	raek	ah, from the javadocs for java.util.HashSet: "This class permits the null element."
07:07	raek	(doto (java.util.HashSet.) (.add nil) (.add 123))
07:07	raek	#<HashSet [null, 123]>
07:09	borkdude	ah
07:13	raek	borkdude: I think NilExpr is the abstract syntax tree node for a nil literal (so not the runtime value)
07:58	stevenyi	hi all, question: is System/arraycopy supposed to be unusable? I get: CompilerException java.lang.NoSuchFieldException:
08:02	Ember-	why would you want to use it?
08:02	Ember-	are you receiving arrays from java code?
08:03	borkdude	,(System/arraycopy (to-array [1 2 3]) 0 (to-array [0 0 0]) 0 3)
08:03	clojurebot	nil
08:03	stevenyi	i'm working on some code where performance is important and i need to minimize object allocation; i'm clearing an array by using an empty array to copy
08:04	stevenyi	borkdude : thanks, i see that i flubbed the args
08:04	stevenyi	looks to compile fine now
08:06	stevenyi	odd though that (System/arraycopy) in repo showed the error, i'm still learning clojure so am making easy mistakes still :P
08:06	stevenyi	repl
08:18	borkdude	is there a reader macro for java arrays?
08:19	borkdude	maybe someone has made a reader thingy for this?
08:20	tomoj	there's a base64 somewher
08:20	tomoj	datomic.codec/base-64-literal
08:20	tomoj	for bytes
08:21	tomoj	it wouldn't make a whole lot of sense to me to have a tag for java arrays in particular
08:21	corecode	is there a way to get useful callgraph profiles for jvm/clojure code? i'm just starting with clojure and am a bit lost
08:23	borkdude	corecode that would be nice to have
08:26	borkdude	corecode actually it would be a cool idea to have a leiningen plugin or smth that generates a kind of sequence diagram by running a clojure program
08:28	corecode	well, just something :/
08:29	corecode	also i seem to have a lot of reflection going on
08:29	corecode	but i don't know where
08:29	borkdude	corecode did you set warn-on-reflection to true?
08:30	borkdude	(set! warn-on-reflection true)
08:30	borkdude	(defn foo [o] (.someMethod o)) ;;=> warning
08:30	corecode	yes
08:30	corecode	not sure why i don't get many reflection warnings
08:32	corecode	but from what i see visualvm showed a lot of reflection going on
08:33	corecode	ah i think i'm profiling the wrong thing :/
08:33	corecode	trying to make sense of hadoop and cascalog
08:33	tomoj	there is interesting looking stuff in ritz
08:33	tomoj	but I don't immediately see how to use it
08:35	mpfundstein	is there a meaning behind
08:35	mpfundstein	def -function-with-a-minus
08:35	mpfundstein	?
08:35	mpfundstein	defn sry
08:45	borkdude	mpfundstein defn- defines private functions
08:46	borkdude	mpfundstein ie the metadata of the function has ^:private true
08:46	mpfundstein	borkdude: ok and ^ refers to the function itself?
08:46	borkdude	mpfundstein (defn- foo [] nil)
08:46	borkdude	(meta #'foo) ;;=> {:arglists ([]), :ns #<Namespace user>, :name foo, :column 1, :private true, :line 1, :file "NO_SOURCE_PATH"}
08:47	mpfundstein	oh wow this is awesome didnt now the meta call
08:47	mpfundstein	like ruby cool
08:47	borkdude	mpfundstein ^: is a shorthand notation
08:47	mpfundstein	borkdude: (def ^:dynamic v 1) ; v is a global binding
08:47	borkdude	yes
08:47	mpfundstein	borkdude: what is here different than (def v 1)
08:47	mpfundstein	?
08:48	borkdude	mpfundstein dynamics can be rebound with binding
08:48	mpfundstein	aaah
08:48	mpfundstein	yeah the author shows that letter , but he doesnt explain the ^:dynamic
08:48	borkdude	mpfundstein it's called dynamic scoping
08:49	mpfundstein	aah ok i get it now
08:49	mpfundstein	super thanks
08:49	mpfundstein	and the 0
08:49	mpfundstein	sry -
08:49	mpfundstein	means that if i include my clj file somewhere else than i cant call the function
08:49	mpfundstein	thats probably what private means in a non oop language :-)
08:52	borkdude	,(let [s (java.io.StringWriter.)] (binding [out s] (println "foo") (str s)))
08:52	clojurebot	"foo\n"
08:52	borkdude	mpfundstein yes
08:52	borkdude	mpfundstein you cannot refer to it from another namespace (but with some trickery you can)
08:53	borkdude	mpfundstein it's more to signal that it's an implementation detail you should probably not rely on
08:53	mpfundstein	ok
08:53	mpfundstein	thanks
09:09	Ember-	hmm, I have a nested structure of maps and lists, I want to find a path to a specific part of that structure based on a value of a specific key in one of those maps (id)
09:09	Ember-	I'm guessing I should use the walk api, but not quite sure how
09:10	borkdude	Ember- get-in doesn't suffice?
09:10	Ember-	no, I don't know the sequence of keys yet
09:10	Ember-	that's the problem
09:10	Ember-	so I need to first find those, then use update-in or get-in
09:10	borkdude	Ember- maybe a zipper or smth? http://www.exampler.com/blog/2010/09/01/editing-trees-in-clojure-with-clojurezip/
09:11	Ember-	will check, thanks
09:19	mindbender1	Raynes: how are you depending on clojurescript?
09:22	mindbender1	clojurescript seem to lack a concrete way of obtaining it
09:23	mindbender1	Am I being forced to bundle a jar for myself?
09:30	mindbender1	(use '[cemerick.pomegranate :only (add-dependencies)])
09:31	Ember-	borkdude: read that, nice information but not quite what I need. As far as I understood, zippers need the same data structure all the way
09:31	Ember-	for example seq-zip doesn't understand maps
09:31	Ember-	guess I'll look more into the walk api
09:32	borkdude	Ember- ok, yes, that's why I said "or smth" ;)
09:33	Ember-	:)
09:33	Ember-	but I learned something new with that article, so thanks :)
09:35	borkdude	Ember- I'm curious about your problem and solution since with walk, can you know what the path was for the visited element?
09:36	Ember-	yeah, I'm starting to lean on the fact that I need to do this myself recursively
09:36	Ember-	which seems kinda suprising, I would have guessed this is a common enough problem to be covered in core api
09:37	borkdude	Ember- more zipper examples here http://www.ibm.com/developerworks/library/j-treevisit/index.html
09:37	borkdude	Ember- first some walk examples, then some tree visiting examples with zipper
09:38	Ember-	something like (find-path #(= (:id %) 123) structure) -> [:foo :bar 3]
09:38	borkdude	Ember- I think that has to be find-paths, because there could be multiple, if not all nodes are unique
09:38	Ember-	would traverse the structure, check each element with the predicate and after finding an element which matches the predicate returns a sequence of keys
09:38	borkdude	Ember- I think you can do that with zippers
09:39	Ember-	and yes, you can have multiple paths and hits in that
09:39	Ember-	but was a simplified example
09:39	Ember-	s/find-path/find-first-path
09:39	Ember-	;P
09:40	Ember-	in my case anyway there would be only one valid path since in my data structure :id is unique
09:41	borkdude	Ember- zee zip/next
09:41	Ember-	hmm
09:41	Ember-	I wonder what that documentation really means :)
09:41	Ember-	will have to try
09:44	borkdude	Ember- see here http://www.ibm.com/developerworks/library/j-treevisit/index.html at listing 13 for example
09:44	Ember-	I wonder what kind of zipper I should create, seq-zip just doesn't work like it should in this case
09:45	borkdude	Ember- yes, I'm also struggling with that. I think it either assumed nested vectors or nested seqs?
09:45	Ember-	well, I have both maps and vectors/lists
09:46	Ember-	like: {:id 1 :something "foo" :children []}
09:46	Ember-	a single element
09:46	Ember-	you can have a list of those and inside :children a list of those and so on
09:47	Ember-	and each element has a unique id and I need to find a path to that element so I get a proper sequence of keys to pass to update-in
09:47	borkdude	Ember- is it like xml?
09:47	Ember-	kinda yes
09:47	borkdude	Ember- there's also xml-zip
09:47	Ember-	yeah, I looked at that
09:47	Ember-	it expects results from xml/parse
09:47	Ember-	but hell, let's try :)
09:48	Ember-	well, that's kinda sad
09:48	borkdude	Ember- maybe worth reading http://clojure-doc.org/articles/tutorials/parsing_xml_with_zippers.html
09:48	Ember-	doesn't work :/
09:48	Ember-	each zip traversal function returns just nil
09:49	Ember-	with xml-zip
09:49	Ember-	seq-zip works as long as I'm within lists
09:49	Ember-	but it can't handle maps
09:50	borkdude	Ember- so you need kind of hiccup format to clojure.xml/parse output format?
09:50	Ember-	hmm, not sure I'm following you with that
09:50	Ember-	like I said, all I need is a way to get that path
09:51	Ember-	I could easily do that with recursion and specific functions written for that purpose
09:51	Ember-	but I'm having a feeling there has to be a more generic way to do this (zippers look promising)
09:51	borkdude	Ember- the difference between hiccup format and clojure.xml/parse is described here https://github.com/davidsantiago/hickory
09:52	borkdude	Ember- xml-zip expects the parse format, not hiccup
09:52	borkdude	Ember- ah look! hickory contains hiccup-zip
09:53	Ember-	so, it just takes a bunch of maps and vectors
09:53	Ember-	and creates a zipper for those
09:53	Ember-	sounds promising
09:54	borkdude	Ember- yes, and then you could do a recursive call with zip/next, check the content, if it is ok, return the path into the node, else continue with the next zip/next
09:54	borkdude	Ember- check for the end with zip/end?
09:54	Ember-	zip/next does that already I think?
09:55	Ember-	ah no
09:55	Ember-	it returns stuff which can be recognized with it
09:55	Ember-	sounds promising
09:55	Ember-	guess I'll try that out
09:55	Ember-	thanks man
09:56	Ember-	just a teeny bit suprised that zipper is not in the core
09:56	Ember-	seems to me having a bunch of maps and lists is a really common scenario
09:59	borkdude	Ember- (loop [data (zip/seq-zip '(1 2 3))] (if (zip/end? data) "end" (do (println (zip/next data)) (recur (zip/next data)))))
10:02	Ember-	hmm... I must be using the hickory hicckup-zip wrong
10:02	Ember-	since zip/next with it reaches immediately the end
10:04	borkdude	I don't know why this returns [[1 2 3]] (loop [data (zip/vector-zip '[1 2 3])] (cond (zip/end? data) "end" (= (zip/node data) 3) (zip/path data) :else (recur (zip/next data))))
10:04	Ember-	those zippers are a bit confusing I got to say :)
10:05	borkdude	Ember- maybe it means that it first visited the nodes 1 2 and then 3?
10:06	borkdude	no
10:08	Ember-	(let [test-data [{:id "root", :children [{:id "sub-1", :children [{:id "sub-1-1", :children []}]}]}]] (-> (hick/hiccup-zip test-data) zip/next zip/end?))
10:08	Ember-	true
10:08	Ember-	where hick is hickory
10:08	corecode	is there a faster way than using (union set1 set2)?
10:09	borkdude	Ember- in Clojure Programming, if you have that book, there is a html zipper on page 153
10:09	Ember-	unfortunately I don't have it
10:10	Ember-	well, got to go. Will continue this later today
10:10	Ember-	thanks for your help borkdude, really appreciated :)
10:11	corecode	so (set (concat seq1 seq2)) is much faster than (union seq1 seq2)
10:11	corecode	is that the right idiom to use?
10:12	borkdude	Ember- no problem, I hope I'm not guiding you the wrong way
10:12	borkdude	I now get what the path means
10:12	borkdude	(-> (zip/vector-zip [[1] [2] [3]]) zip/down zip/down zip/path) ;;=> [[[1] [2] [3]] [1]]
10:13	borkdude	it just means, first the "cursor" was at the entire thing, then it zoomed in on the first thing down and then the first thing down
10:14	borkdude	this isn't really helping for your answer
10:17	borkdude	although the path shows.. the path that is possible, not the keys for get-in
10:22	preyalone	Anyone use msysGit?
10:36	preyalone	Anyone use Cygwin?
10:45	preyalone	Anyone use MSYS?
10:45	preyalone	Anyone use git on Windows?
10:45	OE	yeah
10:46	TimMc	~anyone
10:47	epitron	i use cygwin + cygwin git
10:47	TimMc	clojurebot: Alive?
10:47	TimMc	Looks like they left, anyhow.
11:07	jcromartie	how can I get the fully-qualified version of a symbol from a namespace… I know how to get a var with ns-resolve
11:07	jcromartie	,(ns-resolve ns 'map)
11:07	clojurebot	#'clojure.core/map
11:07	jcromartie	but what do I do with the var?
11:08	tutysra_	hi room, I am implementing some concurrent code where some object should be initialized only once (inserted into db and its id fetched), many threads access it at a time and the first thread takes care of creating it and all others should use the already created copy... i thought a memoized function will do the job,but it didn't, any thoughts on how this can be done?
11:17	jcromartie	tutysra_: sounds like you could design that differently
11:18	jcromartie	tutysra_: is this one big operation that happens concurrently, or is it something that is going on sporadically
11:21	tutysra_	i am inserting n records and the record insertion is done from many threads (using pmap), they all call get-root to get the root element below which they are inserted, the first record that is inserted creates the root record and initializes the root before creating itself and all other records refer to the root-record created earlier
11:21	tutysra_	all the records are inserted below the root which is created once
11:22	jcromartie	why not create the root first, then use the ID in the parallel operations
11:22	jcromartie	i.e. (let [root (create-root …)] (pmap #(create-child root …) child-data-coll))
11:23	hiteki	hi
11:24	jcromartie	tutysra_: well you'd have to do (doall (pmap …)) to get them all to execute in that example, specifically
11:24	imdhmd	hello all ... is there a good repl or clojure coding env for android platform?
11:25	chronno	jcromartie: Don't know if it helps, but the meta for the var has the info you need
11:26	borkdude	Ember- here I made an example with xml-zip https://www.refheap.com/paste/12007
11:26	chronno	,(ns-name (:ns (meta (resolve 'map))))
11:26	clojurebot	clojure.core
11:26	chronno	,(:name (meta (resolve 'map)))
11:26	clojurebot	map
11:26	borkdude	Ember- at least you can see the path it take to get to the element
11:27	borkdude	Ember- you could enhance the output so the path is somewhat nicer to read
11:27	jcromartie	imdhmd: the ones I've tried all suck
11:27	jcromartie	chronno: thanks, that's the route I was going down
11:27	tutysra_	jcromartie, I can do that... but my data is just the record that i am inserting and i have various types of it and I get them from external data (scrapping website),i am segregating similar type of records by creating a root record and putting the different types of the records under different roots dynamically as and when i get the records
11:27	borkdude	Ember- I think you should use hickory's format though and not hiccup-zip, since that one doesn't handle attributes I think
11:28	jcromartie	tutysra_: ah, I see… so the root might not yet exist
11:28	tutysra_	yeah... i won't know then until i see the data
11:30	jcromartie	tutysra_: hm, well using some kind of memoization is a pretty stateful way to do it
11:30	chronno	jcromartie, found a better one
11:30	jcromartie	tutysra_: but no, built-in memoize won't help you there
11:30	chronno	,`map
11:30	clojurebot	clojure.core/map
11:30	imdhmd	jcromartie: yeah .. I c it wud require a specialized keyboard support. hmm
11:30	tutysra_	yeah... it didn't worked
11:31	jcromartie	tutysra_: but you could write your own memoized function
11:32	tutysra_	thid doesn't work - (defn myfunc[a] (println "doing some work") (Thread/sleep 3000)(+ a 10)),(def myfunc-memo (memoize myfunc)), (pmap myfunc-memo [0 0 0])
11:32	tutysra_	*this
11:34	jcromartie	(let [cache (atom {})] (defn get-root [key] (if-let [v (get cache key)] v (get (swap! cache assoc key (create-root key)) key)))
11:34	jcromartie	tutysra_: looking at the source of memoize
11:34	jcromartie	tutysra_: p.s. I just wrote that here in IRC… don't take it as truth
11:35	tutysra_	jcromartie, sure ;-), let me try that first
11:36	jcromartie	tutysra_: oh, an important change, you should (get @cache key)
11:36	jcromartie	not (get cache key)
11:36	jcromartie	wait a sec
11:37	jcromartie	tutysra_: memoize should work there…. if you have a function (get-root …) which creates (in the DB) the value you want, then (memoize get-root) will only call it the first time for each new key
11:37	jcromartie	tutysra_: it should be fine if your get-root is correct
11:38	jcromartie	but like I said, this all sounds kind of fishy… memoize is not really for limiting side-effects
11:38	jcromartie	and what happens if you run your program twice?
11:38	jcromartie	it's better to make everything idempotent
11:39	tutysra_	it should create a record only if it doesn't exist, so in the second time if we get the same record and root type it should read the database and skip the insertion
11:40	tutysra_	jcromartie, reg memoize - (defn myfunc[a] (println "doing some work") (Thread/sleep 3000)(+ a 10)),(def myfunc-memo (memoize myfunc)), (pmap myfunc-memo [0 0 0])
11:40	tutysra_	it prints "doing some work" more than once on my system
11:41	jcromartie	tutysra_: just a sec
11:44	jcromartie	tutysra_: I think this is an abuse of memoize :)
11:47	tutysra_	jcromartie, before memoize i had written a function similar to the one you gave and I switched to memoize because that didn't worked, let me check the previous code you gave
11:47	jcromartie	tutysra_: the problem is that the function you are memoizing can't be retried
11:48	jcromartie	and atoms (which memoize is built on) will retry when another thread tries to modify the atom at the same time
11:48	jcromartie	so pmap throws it all off
11:48	tutysra_	jcromartie, correct, i know that, i has side effects
11:48	jcromartie	better to stick with purs functions
11:48	jcromartie	pure functions
11:49	jcromartie	,(let [a (atom 0) f (fn [_] (println "incrementing" @a) (swap! a inc))] (dorun (pmap f (range 10))) @a)
11:49	clojurebot	#<SecurityException java.lang.SecurityException: no threads please>
11:49	jcromartie	no, OK stick that in your own REPL tutysra_ :)
11:51	tutysra_	jcromartie, got your point, inc is pure
11:52	tutysra_	i would like to use pure functions everywhere... but can't escape here
11:52	jcromartie	tutysra_: you might be surprised… what's the bigger picture?
11:54	tutysra_	jcromartie, himmm not getting it... any hints?
11:57	jcromartie	tutysra_: can you gather up everything ahead of time before inserting it in a database?
11:57	jcromartie	i.e. get the structure out and then do the insert
11:59	tutysra_	yeah i can do that if that is the only option.... will be interested in knowing how I can implement such scenario in clojure
12:04	jcromartie	tutysra_: well you could do it in a couple of ways
12:04	jcromartie	you could use an agent to do the inserts
12:04	jcromartie	i.e. you do the crawling in parallel, but serialize the DB activity
12:05	jcromartie	but that's very side-effecty
12:06	jcromartie	maybe you can describe the problem
12:07	jcromartie	you could do an insert-or-update inside a DB transaction
12:07	clifton	have you looked at REPLACE INTO?
12:08	tutysra_	jcromartie, himm, problem is very much the same, to give more context i am using neo4j
12:08	jcromartie	ooh, nice
12:08	jcromartie	ah ha
12:08	jcromartie	that helps
12:08	tutysra_	more specifically their rest binding
12:08	jcromartie	neo4j still has transactions, and you can do the same kind of create-or-update
12:10	jcromartie	(I assume…)
12:10	jcromartie	hm yeah, CREATE UNIQUE
12:11	tutysra_	yeah...create unique seems to be a nice option... let me try that
12:20	fredyr	https://www.refheap.com/paste/12009
12:21	fredyr	anybody think core.logic would be a good fit for this problem?
12:21	fredyr	or other ideas?
12:28	tutysra_	jcromartie, thx, unique worked...
12:29	jcromartie	:) glad there was a simple solution waiting to be coaxed out
12:30	tutysra_	we kind of delegated this to the db :-) ... if you think of any other solution, do keep me informed
12:30	tutysra_	i will ping my mailid in a private msg
12:31	jcromartie	delegating it to the DB might be the best solution
12:32	jcromartie	in fact I'd say that's the best way to go when a DB is involved
12:32	jcromartie	let it do what it's designed to do
12:32	tutysra_	himm okie...
12:33	jcromartie	Clojure's concurrency is designed around Clojure's own persistent datatypes and pure functions
12:36	palango	I'm trying to get leiningen project information from a jar file, is there any api to do that?
12:40	bbloom	does (:refer-clojure :as clj) not work? what's the magic syntax there?
12:41	jeremyheiler	bbloom, I use (:require [clojure.core :as core])
12:42	bbloom	jeremyheiler: ok, that's what i'm doing, just wondering why :as doesn't work :-/
12:42	bbloom	thanks tho
12:42	jeremyheiler	,(doc refer)
12:42	clojurebot	"([ns-sym & filters]); refers to all public vars of ns, subject to filters. filters can include at most one each of: :exclude list-of-symbols :only list-of-symbols :rename map-of-fromsymbol-tosymbol For each public interned var in the namespace named by the symbol, adds a mapping from the name of the var to the var to the current namespace. Throws an exception if name is already mapped to somethin...
12:43	jeremyheiler	refer seems to only support :exclude, :only, and :rename
12:43	Bronsa	yeah, :as is alias
12:43	bbloom	i guess that makes sense since refer-clojure delegates to refer
12:43	bbloom	but i wish :as worked :-P
12:44	jeremyheiler	Well, the point of refer is to not have a namespace alias :-P
12:45	bbloom	jeremyheiler: right, but i want to do: (:refer-clojure :exclude [foo bar] :as clj) so that i can get to clj/foo and clj/bar
12:45	bbloom	now i need two lines to do it :-/
12:45	bbloom	i guess what i want is :require-clojure instead
12:45	bbloom	which is what i often type at first, heh
12:48	jeremyheiler	That seems confusing. I would think you're trying to exlucde foo adn bar, but namespace clojure.core as clj.
12:49	jeremyheiler	I see what you're after, though.
12:52	jeremyheiler	bbloom, To get it on one line you could say (:refer-clojure :rename {foo core-foo})
12:53	bbloom	jeremyheiler: i know, but i prefer the alias, thanks tho
12:54	jeremyheiler	bbloom, heh, so do i.
14:47	gfredericks	31mb of #clojure logs over two years, zipped
14:53	borkdude	gfredericks nice
14:56	noncom	once i somehow managed to make REPL pprint functions not like something like #<pointers_and_stuff> but like their AST. but i cannot understand how it happened, i do not remember doing anything special and I can't find a doc on this. how to do that?
14:57	bbloom	noncom: as far as i know, that doesn't exist in clojure
14:57	gfredericks	what was technomancy's lib for that?
14:57	gfredericks	serialized-fn I think
14:57	gfredericks	wouldn't directly apply to existing functions though
14:58	borkdude	cemerick hey, I was just re-reading some part from clojurebook and I wondered: what did you use to write/edit the book
14:58	noncom	nope. it happened spontaneously. i am using CCW
14:58	muhoo	i have to interface with a java function that DEMANDS an arrya of FooObject. i've got a seq, need to turn it into an array of FooOBject. to-array just turns it into Object, which is not OK.
14:58	gfredericks	,(doc to-array)
14:58	clojurebot	"([coll]); Returns an array of Objects containing the contents of coll, which can be any Collection. Maps to java.util.Collection.toArray()."
14:58	gfredericks	,(doc make-array)
14:58	clojurebot	"([type len] [type dim & more-dims]); Creates and returns an array of instances of the specified class of the specified dimension(s). Note that a class object is required. Class objects can be obtained by using their imported or fully-qualified name. Class objects for the primitive types can be obtained using, e.g., Integer/TYPE."
14:58	muhoo	make-array, thanks!
14:59	borkdude	,(apropos "array")
14:59	clojurebot	(object-array boolean-array long-array short-array char-array ...)
14:59	TimMc	gfredericks: How far do your #clojure logs go back?
14:59	gfredericks	TimMc: I just ripped from n01se, all the way back to the dawn of swearjure
14:59	cemerick	borkdude: like, for markup?
15:00	TimMc	gfredericks: Ah, OK.
15:00	borkdude	cemerick yes, the process
15:00	borkdude	cemerick from text to published version
15:00	gfredericks	TimMc: only 104 mentions of "swearjure" over all time
15:00	TimMc	Unbelieveable.
15:00	TimMc	You'd think it would be more. :-P
15:01	cemerick	write asciidoc -> git-svn push -> O'Reilly svn hooks convert asciidoc -> docbook -> #{:pdf :mobi :epub}
15:01	gfredericks	I'm appauled it isn't. Clearly we need to do a better job of educating the public.
15:01	gfredericks	TimMc: I'll put this on the agenda for the next committee meeting
15:02	borkdude	cemerick how do you write those labeled numbered balls in asciidoc?
15:03	muhoo	actually, into-array was a drop-in relacement for to-array, and did exactly what i wanted
15:03	borkdude	cemerick btw I'm going to recommend this book for my course
15:03	cemerick	borkdude: which have bidirectional anchors in the PDF :-)
15:04	cemerick	borkdude: http://www.methods.co.nz/asciidoc/userguide.html#X105
15:04	cemerick	borkdude: sweet! :-)
15:04	borkdude	cemerick ah I see :) do all authors use asciidoc in oreilly?
15:05	gfredericks	muhoo: I had hoped there was an easier one
15:06	cemerick	borkdude: no, most write directly in docbook
15:06	cemerick	or, last I knew, anyway
15:06	Frozenlock	Hmmm.. I have some weird errors popping up. I moved some functions in another namespace, but I made sure to `refer' them in the namespace declaration. Now I have this error: java.lang.IllegalStateException: <my-fn> already refers to: #'my-ns.sub/<my-fn> in namespace: my-ns.core
15:07	borkdude	cemerick tnx
15:07	cemerick	so, that process held until "final review", at which point the whole thing was taken over by people using framemaker, and the only way to get edits through was via comments in a generated PDF :-x
15:07	borkdude	cemerick when co-writing it must be nice to use text based git approach
15:08	cemerick	it's a reasonable minimal toolchain :-)
15:09	gfredericks	Frozenlock: did you restart your repl?
15:09	Frozenlock	Yup
15:09	borkdude	cemerick I'm using org-mode now, but keeping an eye on this for future work tnx
15:10	gfredericks	Frozenlock: and you're sure you deleted my-fn from the core ns?
15:10	gfredericks	Frozenlock: did a `lein clean`?
15:10	Frozenlock	Yes
15:10	Frozenlock	No
15:10	Frozenlock	:/
15:11	gfredericks	try that and if that doesn't work start adding and removing parens at random
15:14	Frozenlock	Well now I get a 'not such var...' error. Perhaps I'm not using this correctly. Project A --> (:require [b.core :as c]) Project B --> (ns b.core (:require [b.subs :refer my-fn])). Then in project A ---> c/my-fn BAM error.
15:15	gfredericks	oh you want my-fn to be accessible from project A as if it's defined in b.core?
15:16	gfredericks	(also :refer takes a list)
15:16	Frozenlock	Yes. And yes, I did use a list :p
15:18	Frozenlock	Kind of like an API if you will. Gather all the functions the user might need in a common namespace.
15:19	gfredericks	yeah that's not what refer does
15:19	gfredericks	I don't know if there's a standard mechanism for effecting that
15:20	gfredericks	there was a contrib lib that did it back in the day I think
15:22	Frozenlock	Oh... disappointment :(
15:23	gfredericks	easy enough to hack; (def my-fn #'b.subs/my-fn)
15:23	gfredericks	that's only mostly equivalent if it's a function
15:24	gfredericks	not at all equivalent if it's a constant
15:26	bbloom	gfredericks: (def my-const @#'b.subs/my-const)
15:26	bbloom	:-)
15:26	bbloom	breaks during interactive development tho, since it loses an indirection
15:26	gfredericks	bbloom: may as well (def my-const b.subs/my-const) then
15:27	bbloom	gfredericks: yes, i know. bad joke....
15:27	seangrove	cemerick: You mentioning working on a book with a git-like flow reminded me of Draft: http://ninjasandrobots.com/draft-preview-uber-for-writing
15:28	bbloom	gfredericks: can probably call `intern directly
15:28	bbloom	hm or maybe not
15:28	bbloom	would have to construct a Var by hand, private constructors and things
15:28	derekv	java -jar my-uberjar.jar yields "no main manifest attribute", I put :aot [mynamespace.core] :main mynamespace.core in my project.clj and have (ns mynamepsace.core (:gen-class)) with (defn -main [$ args] (println "hello"))
15:29	derekv	any help?
15:31	derekv	nevermind, did a clean and its fixed..
15:34	sritchie	cemerick, do you know if it's possible to sync a single view's worth of data between couchdb apps?
15:34	sritchie	vs syncing the entire database
15:35	gfredericks	you can put a filter on replication
15:35	gfredericks	I think that's the extent of it
15:37	cemerick	seangrove: interesting, thanks!
15:38	cemerick	sritchie: not AFAIK. Maybe with bigcouch?
15:38	sritchie	hmm
15:38	sritchie	cemerick: I'm working on an iPhone app for users of a CouchDB app --
15:39	sritchie	the idea is that they'd be able to work with a view offline
15:39	sritchie	that might be too much functionality for now
15:39	sritchie	maybe just speaking with the view is enough
15:39	sritchie	I just don't want the app to have to download the entire view
15:40	cemerick	sritchie: well, query to limit the range you cache/store?
15:41	sritchie	it's the sync back to the app I was concerned with
15:41	sritchie	but I'll probably have to do that syncing manually
15:41	sritchie	I was hoping that the replication feature could handle that somehow
15:41	cemerick	well, views don't take updates anyway
15:41	sritchie	gotcha
15:41	sritchie	okay, cool
15:41	cemerick	you've seen https://github.com/mikeal/pouchdb ?
15:45	derekv	how do I test that a function fails an assert if I pass it a bad parameter?
15:45	derekv	sorry very new trying to get a grip on the language and testing framework
15:46	gfredericks	derekv: with clojure.test?
15:46	seangrove	cemerick: I think https://github.com/daleharvey/pouchdb is a bit more up to date, heh
15:46	gfredericks	(is (thrown? AssertionError (my-fn some bad parameters)))
15:46	derekv	yea... maybe its (is (thrown?
15:46	gfredericks	derekv: ^ I believe more or less like that
15:46	derekv	heh
15:47	derekv	gfredericks, thanks
15:47	derekv	=]
15:47	cemerick	seangrove: ah, fair enough; mobile isn't my bag :-)
15:47	sritchie	cemerick: very cool
15:47	derekv	I hit a point I wasn't ever sure where to look online then I realized that they were just java exceptions
15:47	sritchie	cemerick: looks like replication with a filter is what I want, I think
15:48	sritchie	https://github.com/couchbaselabs/TouchDB-iOS/wiki/Guide%3A-Replication
15:48	sritchie	filtered replications. done.
15:49	gfredericks	derekv: and you could do something more sophisticated to expect on the msg in the error if you wanted
15:50	cemerick	sritchie: Oh, certainly. I got thrown by the view part :-)
15:50	sritchie	cemerick: yeah, my bad -- I was looking to replicate all info required to create a view for some customer
15:50	sritchie	man, what a cool DB
15:50	sritchie	too bad haters gonna hate :)
15:52	devlol	Hi, I just wrote a small lib on top of compojure/clout which allow you to specify custom wrappers for specific endpoints, group of endpoints and generate iodocs documentation. What do you guys think of this approach ? https://gist.github.com/obohrer/c7011444273c36235558
16:10	ivan	did you know Sun launched a Java Store in 2009 https://www.youtube.com/watch?v=AZyHmLmPyTU that was silently killed in 2010
16:12	gfredericks	a what
16:13	ivan	an app store that would reach a billion people, presumably through the annoying updater
16:15	akhudek	oh my, those youtube comments D:
16:20	gfredericks	ooh I somehow read "brick and mortar" into that
16:20	TimMc	Java t-shirts
16:20	gfredericks	JVMs on shelves
16:21	gfredericks	people lining up for java 7
16:21	TimMc	reinforced shelving, of course
16:21	gfredericks	6 foot posters with slick marketing about lambdas
16:22	gfredericks	and of course jeniuses trained to help you with the thorniest of NPEs
16:29	amalloy	maybe people would line up for java 7 if it had better beveled edges
16:53	hyPiRion	gfredericks: hahah
16:53	gfredericks	have to escape every damn character in that
16:53	hyPiRion	~quicksort
16:54	amalloy	gfredericks: grep -P "\Q(+()()\E"?
16:54	amalloy	i guess you'd need to escape the \ still, or use ' instead of "
16:56	gfredericks	amalloy: yes I probably should have done that
16:57	tyler_	whats the most stable/recommended irc client?
16:58	tyler_	library
17:00	derekv	nothing is working first try from any examples online... =[ what the heck in wrong about this : https://www.refheap.com/paste/12013
17:01	derekv	I get unable to resolve classname Doll
17:07	gfredericks	derekv: you have to import defrecords
17:07	gfredericks	if you want to use their java class name
17:07	gfredericks	looks like in this case you could use ->Doll instead
17:07	gfredericks	(a function that defrecord implicitely defines for you)
17:09	derekv	can you give me an example of using ->Doll ?
17:10	gfredericks	(->Doll. expected-name expected-weight expected-value)
17:10	gfredericks	er
17:10	gfredericks	(->Doll expected-name expected-weight expected-value)
17:10	derekv	gfredericks, thanks ... do I still need the (def ?
17:11	gfredericks	on an unrelated note, there's no need for def on line 13 -- you can do that as part of the let
17:11	derekv	or do I use set
17:11	derekv	ok
17:11	derekv	sortof, had no idea what the def did
17:11	gfredericks	using def not at the top level is rarely ever what you want to do
17:11	derekv	just was looking at examples
17:12	gfredericks	a lot of example code will use def for toy things because it's useful at the repl, but not always what you'd put in real code
17:12	derekv	gfredericks, that worked, thanks
17:12	gfredericks	np
17:12	derekv	yea I know some CL but wasn't familier with what def did, I thought maybe it had something to do with records specifically
17:13	derekv	so the dot in ClassName. means you want to create an instance of that java class?
17:13	gfredericks	it just makes a global thing within the namespace
17:13	gfredericks	yes
17:14	derekv	cool
17:24	Raynes	Man, clj-time is such an inconsistent mess.
17:25	Raynes	clj-time.core/hour clj-time.core/minute (doing good so far!!!) clj-time.core/sec........
17:25	Raynes	Ohai, let's name half of our functions in abbreviated form and the rest of them with the whole words!
17:28	gfredericks	the rule is "use abbreviated whenever possible and unambiguous"
17:28	Raynes	Where is this rule?
17:29	gfredericks	I'm making shit up
17:29	Raynes	I was hoping that was the case.
17:29	gfredericks	actually now that I think about it both min and second are in clojure.core. so either way you're colliding, which I agree is totally okay to do.
17:32	Raynes	gfredericks: I've stopped caring completely about what is and isn't in core. People need to embrace the require!
17:33	gfredericks	(defn require! [& args] (throw (Exception. "require! is not defined. perhaps you meant `require`?")))
17:36	Raynes	gfredericks: You are a clever and amusing individual, but I can still match wits with you on any day.
17:37	Raynes	In other news, wtf https://www.refheap.com/paste/12010
17:37	jcromartie	what's the simplest possible persistence approach for a really simple clojure system
17:37	Raynes	Well, how much do you need to persist?
17:37	gfredericks	Raynes: you are ten times more clever than me after normalizing for experience
17:38	Raynes	You could spit out Clojure data structures to a file and read them back later, but that obviously becomes pretty insufficient pretty fast.
17:39	ivaraasen	Raynes: seen worse
17:39	Raynes	MongoDB is extremely simple and easy to get going.
17:39	Raynes	But I don't know if that qualifies as the simplest possible approach.
17:39	Raynes	I'm pretty sure that just writing stuff to files is the simplest approach.
17:40	Raynes	Or tell it to amalloy and ask him later.
17:40	Raynes	Account for occasional data loss if he drinks to much, but that's rare.
17:40	Raynes	too*
17:41	amalloy	LeaveMeAloneImSleepingException
17:41	Raynes	Give him a can of campbells soup and he shut down with a non zero exit code.
17:41	jcromartie	Raynes: a few dozen small hash mas
17:42	jcromartie	hash maps
17:42	derekv	(if (not (seq? [])) 'groan)
17:42	Raynes	Sure, you can just write that to a file and read it in later.
17:42	jcromartie	so, do the change, and then just (send-off file-writer save my-ref)
17:42	gfredericks	derekv: sequential?
17:42	jcromartie	yeah, can't get any simpler
17:43	jcromartie	no need for an append-only file-rotating journaled transactor :)
17:43	derekv	gfredericks, thanks again
17:45	gfredericks	np
17:46	TimMc	Raynes: Looks like someone's writing Conway's Life, but I can't tell what language they're using.
17:47	ryanf	kinda looks like one of those apl-inspired languages maybe?
17:47	amalloy	spanish, TimMc. duh
17:50	TimMc	pff
17:51	TimMc	&#'clojure.core/add-doc-and-meta
17:51	lazybot	⇒ #'clojure.core/add-doc-and-meta
17:54	alandipert	jcromartie: i made https://github.com/alandipert/enduro to use on my raspberry pi, maybe you'd enjoy it?
17:57	Frozenlock	alandipert: you used clojure on the raspberry pi?
17:57	alandipert	Frozenlock: indeed!
17:57	Frozenlock	!!
17:57	Frozenlock	It... works? :p
17:58	Frozenlock	Speed/memory are sufficient?
17:58	alandipert	for many neat things, yes
17:58	Frozenlock	Does it mean you need to tweak .core?
17:58	jcromartie	oh neat
17:59	alandipert	Frozenlock: nope just need to install JDK, lein as on linux
17:59	Frozenlock	Wow. Now I need a raspberry pi.
18:00	Frozenlock	Hmm I wonder if it's easy to play with IOs via clojure.
18:00	jcromartie	Frozenlock: it's not
18:00	jcromartie	if you mean Apple's iOS
18:01	jcromartie	or do you mean like, ObjC on iOS and Clojure on a server
18:01	Frozenlock	No, I mean input/output, as on a microcontroller
18:01	jcromartie	gag gag
18:01	jcromartie	I mean hah hah
18:01	jcromartie	context :)
18:01	jcromartie	alandipert: neat
18:01	alandipert	Frozenlock: i did some GPIO stuff from clojure - blinked some LEDs, didn't do much more, but it's all possible afaik
18:02	Frozenlock	Nice!
18:08	drewc	Frozenlock: I just got my gertboards, which means my arduino has not been used in a while!
18:08	drewc	http://www.raspberrypi.org/archives/tag/gertboard
18:14	derekv	emacs compilation buffer doesn't totally parse the lein output correctly
18:14	derekv	it doesn't always make filename - line numbers into hyperlinks
18:16	bbrittain	this mighth seem like a silly question. What is the difference between
18:17	bbrittain	(def nums `(1 2 3 4 ))
18:17	bbrittain	(def nums2 (list 1 2 3 4 ))
18:17	bbrittain	why can I peek on one, and not the other?
18:17	tyler_	i have a ref thats a map and i just want to update one attribute of it, what si the best function?
18:17	bbrittain	and why does "(= nums nums2)" return true then?
18:18	tyler_	(= {:foo "bar" :biz "baz"} @ref)
18:19	tomoj	&(class `(1 2 3 4))
18:19	lazybot	⇒ clojure.lang.Cons
18:19	tomoj	&(class (next (concat (list 1 2 3) (list 4 5 6))))
18:19	lazybot	⇒ clojure.lang.Cons
18:19	tomoj	it's not clear to me why you can't peek a Cons
18:20	tomoj	oh
18:21	tomoj	mmarcyzk says because an IPersistentStack has to have a count()
18:21	tomoj	but he was wrong
18:23	tomoj	related: https://groups.google.com/d/msg/clojure/co8lcKymfi8/CjyOPpR6FRMJ
18:24	bbrittain	tomoj, good to know other people are confused too :P
18:24	tomoj	I think mmarcyzk's last message is close to the truth
18:26	callenbot	yogthos\|away: you. I like you.
18:27	tomoj	a PersistentList's rest is always IPersistentList
18:32	derekv	is there a sort of (collection? #{})
18:32	derekv	something to test that it is a collection
18:34	alandipert	derekv: coll?
18:35	derekv	alandipert, thanks
18:36	derekv	alandipert, hey we met briefly at strangeloop 2011. just before simple iirc
18:37	derekv	simple made easy rather
18:37	alandipert	derekv: oh yeah! tablemates iirc. sup :-)
18:37	derekv	=] Yea, I didn't know who Rich Hickley was when I sat down.
18:38	derekv	s\ckle\cke
18:43	Raynes	derekv: Your life was so dull up until then.
18:47	derekv	=]
18:47	derekv	Or you could say my life has been dull since then.
18:52	yogthos	callenbot: I hear I am somewhat likeable :P
19:00	callenbot	yogthos: yes but I like very few people.
19:00	callenbot	yogthos: also, Zurb shit the bed.
19:00	yogthos	callenbot: ha~
19:01	callenbot	yogthos: 4.0 release of Zurb is pretty fucked.
19:01	callenbot	I'm migrating over to bootstrap right now.
19:01	yogthos	yeah good plan
19:01	yogthos	I recall you had your reservations about it before
19:01	callenbot	yogthos: I've had bad experiences with bootstrap before but the community support and recent improvements seem like they might solve some of that for me.
19:02	callenbot	yogthos: most of my bad experiences centered around making substantive modifications to the nav bar
19:02	yogthos	ahh
19:02	yogthos	that's the thing with frameworks, they are opinionated :)
19:02	callenbot	yogthos: sigh. you're telling me.
19:03	yogthos	oh and played with korma finally, it is nice
19:03	yogthos	Ed switched luminus to use it by default now
19:03	callenbot	yogthos: I told you korma was nice.
19:03	yogthos	:)
19:03	callenbot	yogthos: it seriously understands "make a language of reusable components" even if it has a long way to go.
19:03	yogthos	yup
19:03	callenbot	also what's with the netsplit carnage lately?
19:04	yogthos	lol dunno what's up with that
19:04	callenbot	yogthos: sadly my work is in Flask/SQLAlchemy right now and will likely continue to be for awhile. I went independent, working on contract.
19:04	callenbot	yogthos: going to try to use contract as runway for my own shindig.
19:04	yogthos	haha could be worse, some people actually have to work with java :P
19:05	callenbot	don't get me wrong, I like Python
19:06	yogthos	yeah there are worse things that's for sure ;)
19:06	callenbot	yogthos: by a long yard.
19:20	derekv	so, subsets is lazy, does that mean something like (filter #(tasty-combo? %) (subsets things-in-my-pantry)) is lazy?
19:24	yogthos	derekv: yeah chaining lazy functions together is lazy
19:27	derekv	yogthos, if I wrap that in a defn, is that function automatically lazy or do I need write it that way somehow... seems like it would be because its evaluating to a lazy-seq ... i think..
19:28	yogthos	derekv: basically, it'll stay lazy until you force evaluation with something like doall
19:32	derekv	yogthos, very cool
19:47	amalloy	derekv: #(tasty-combo? %) is just tasty-combo?
19:47	Raynes	But feel free to wrap functions in functions in functions if it makes you happy.
19:52	derekv	I'm not sure why I wrote it that way.
19:53	derekv	That was ages ago I don't remember anymore.
19:53	derekv	I'm sure there was a good reason.
20:23	mpfundstein	does someone know how i can sum up all values of a map?
20:23	mpfundstein	{tvod 75, svod 174647}
20:23	mpfundstein	shall return 174722
20:23	danlarkin	(reduce + (vals ...))
20:24	hyPiRion	,(vals {:tvod 75, :svod 174647})
20:24	clojurebot	eval service is offline
20:24	hyPiRion	uh what
20:24	mpfundstein	if i dont know the keys and dont know how much keys?
20:24	metellus	&(vals {:tvod 75, :svod 174647})
20:24	lazybot	⇒ (174647 75)
20:24	mpfundstein	ok thanks
20:25	mpfundstein	works perfect thanks
20:29	sorbo_	did clojure.contrib.lazy-seqs move? I don't see it listed as having migrated, but I can't lein deps it.
20:30	hyPiRion	sorbo_: which seq are you in need of?
20:30	sorbo_	hyPiRion: primes
20:31	hyPiRion	https://github.com/hyPiRion/primes/tree/0.1.0 <<
20:31	hyPiRion	It's faster than the lazy-seq version
20:32	sorbo_	hyPiRion: awesome, thank you
20:32	hyPiRion	Documentation here: http://hypirion.github.com/primes/0.1.0/com.hypirion.primes.html
20:32	hyPiRion	You're welcome.
20:32	hyPiRion	:)
20:32	Raynes	Good guy hyPiRion.
20:32	Raynes	Makes. Me. Sick.
20:33	hyPiRion	Raynes: Want me to be the bad guy again?
20:37	nonuby	whats the easiest way to coerce a number say it must be 1-10 so if the input is 14 it yields 10?
20:38	mattmoss	&(min 10 14)
20:38	lazybot	⇒ 10
20:38	cgag	(min n 10)
20:38	mattmoss	&(max 1 (min 10 14))
20:38	lazybot	⇒ 10
20:39	nonuby	thanks
20:44	bbloom	nonuby: mattmoss: for the record, that function is generally called "clamp" in game & simulation dev circles
20:45	bbloom	(defn clamp [lower upper x] (max lower (min upper x)))
20:49	nonuby	thanks bbloom will remember that
20:49	mattmoss	bbloom: ya, i know... used to work in game dev
20:49	ivaraasen	hyPiRion: sup
20:49	mattmoss	Didn't think clojure had clamp in standard libs, tho. :)
20:51	hyPiRion	ivaraasen: java concurrency and horrible reflection hacks. that's up
20:51	Raynes	callenbot: http://www.youtube.com/watch?v=Wk1_wJoGV5I
20:52	ivaraasen	hyPiRion: do tell
20:54	hyPiRion	ivaraasen: techomancy/leiningen#957 is the main issue
20:55	hyPiRion	Apparently System/in and InputStreams in general are really dirty if you want to do non-blocking stuff
20:55	hyPiRion	http://hypirion.com/musings/how-to-cancel-a-blocking-read
20:56	akhudek	hyPiRion: I appreciate the typography on your blog
20:56	hyPiRion	It essentially boils down into a workaround for this 12 year old bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4514257
20:56	hyPiRion	akhudek: oh, thank you
20:57	ivaraasen	hyPiRion: actually looked into this the other day by chance. then I went to bed and cried myself to sleep
20:57	hyPiRion	Yeah, that's the right way to handle it.
21:13	ravster	Are there geo location libs in clojure? We're trying to figure out if we can find places of interest within a radius of a location (Denoted by latitude and longitude)
21:17	lynaghk	ravster: there's an implementation of the haversine algorithm in c2, though it's not particularly optimized or anything
21:17	lynaghk	but it'll give you the great circle distance between two lat/lons on a sphere
21:18	danlarkin	I think it's safe to assume there are some nice java libs to do spatial math
21:20	ravster	lynaghk: thanks, I'll look into it.
21:37	Bronsa_	porcodio
21:37	Bronsa_	lol
21:37	Bronsa_	ho svegliato
21:37	Bronsa_	mia madre
21:49	Bronsa	quanto
21:49	Bronsa	chap
22:10	muhoo	cosa di pazza
22:10	muhoo	i present for your ridicule, this steaming pile: https://www.refheap.com/paste/12019
22:17	gfredericks	muhoo: wat it is
22:18	muhoo	hehe. i'm not quite exactly sure.
22:18	derekv	(alter max-weight Integer/parseInt input-string) -> Unable to find static field: parseInt in class java.lang.Integer
22:19	TimMc	derekv: You'll want #(Integer/parseInt %) there.
22:19	derekv	TimMc, =] sweet
22:19	TimMc	Interop forms are annoying that way.
22:19	TimMc	Basically, since parseInt is a method, it has to be in a call position.
22:20	derekv	I see
22:44	derekv	How am I supposed to figure out where the error is from "Wrong number of args (2) passed to: core$input-handler$fn--124$fn--125$fn"?
22:49	TimMc	derekv: So, that's some fn inside a fn called input-handler inside a namespace call core. Probably.
22:49	TimMc	And something is passing it two args.
22:51	derekv	I'm not sure what fn... sorry this is horrid, trying to get the test green so i can refactor.. https://www.refheap.com/paste/12020
22:53	derekv	There's probably some inbalanced paran or something, but i'm on about my 8th time checking it
22:54	derekv	i should probably just start over and rethink it
23:00	derekv	rewriting
23:00	derekv	hated it anyways
23:00	TimMc	derekv: Could it be that alter is passing 2 params to that fn literal?
23:01	TimMc	That's the only inner function I see, and it's plausible...
23:01	TimMc	(Macros could be introducing other fns, of course.)
23:02	derekv	the parseInt?
23:03	TimMc	yeah
23:03	derekv	although I guess that means it could be the "catch" clause, i'm sure thats macro driven
23:03	muhoo	i haven't seen any code that uses preconditions or postconditions in the wild. is that considered a deprecated feature? or one that's just not used? or am i missing something?
23:05	TimMc	muhoo: https://github.com/timmc/pellucida/blob/master/src/org/timmc/pellucida/single.clj#L13
23:05	Raynes	muhoo: Hi.
23:06	muhoo	Raynes: yo
23:06	muhoo	TimMc: thanks
23:06	TimMc	muhoo: This one is better: https://github.com/timmc/pellucida/blob/master/src/org/timmc/pellucida/pager.clj
23:07	Raynes	muhoo: I just recorded a video cover of a song for fun and I might be persuaded to let you see it.
23:07	TimMc	Basically, I use them both as sanity checks (so that a bad value doesn't cause a hard-to-debug stack trace) and as documentation.
23:07	muhoo	Raynes: no shit? youtube that puppy
23:08	muhoo	TimMc: looks useful. i can recall seeing in clojure sourcecode that dated back a long time, but not in any recent projects, until this one. seems really a useful thing
23:08	muhoo	instead of having try/catch crap cluttering up the code
23:08	muhoo	actually no. instead of having if/throw cluttering up the code
23:09	TimMc	A really useful fn to use with pre/post is ##(doc cast)
23:09	lazybot	⇒ "([c x]); Throws a ClassCastException if x is not a c, else returns x."
23:09	muhoo	heh, static typing!
23:09	TimMc	Ish.
23:10	derekv	so if i want to filter out the falsy things from a collection, is there a more elegant way than "(filter #(not (not %)) coll)"
23:10	TimMc	derekv: identity
23:10	TimMc	&(filter identity [1 2 false true nil "hi"])
23:10	lazybot	⇒ (1 2 true "hi")
23:11	derekv	TimMc, cool perfect
23:25	TimMc	General question about web apps: Should I show an error page when I get a malformed optional querystring parameter, or just ignore it?
23:26	TimMc	Example: ?page=wtf
23:28	Raynes	TimMc: Probably ignore it.
23:29	dcolish	TimMc: thats what a 400 page is for
23:30	dcolish	its best to let the client know if there's a malformed request unless there are security reasons not to
23:30	dcolish	s/page/response/
23:30	dcolish	i assumed page, but you could be writing a rest client for all I know
23:31	TimMc	Web page.
23:33	dcolish	imho, you should not ignore malformed inputs even if they're optional because the user is expecting a specific behavior and its less surprising to get an error with some suggestion of how to fix the request than return 200 with a default value
23:44	amalloy	TimMc: it's okay to ignore query params you don't use at all, but if ?page has any valid values then you should return 400 if something invalid is there