#clojure – 2015-12-27

2015-12-27

02:17	jeaye	How can I partition [1 2 3 4 5 6] into [[1 2 3] [4 5 6]] such that anything < 4 goes into one side and all else goes into another?
02:20	ridcully_	(doc partition-by)
02:20	clojurebot	"([f] [f coll]); Applies f to each value in coll, splitting it each time f returns a new value. Returns a lazy seq of partitions. Returns a stateful transducer when no collection is provided."
02:21	jeaye	Ah, even nicely named.
04:30	cfleming	TEttinger: My pleasure!
04:35	TEttinger	I'm mostly using IntelliJ for Java these days, but I have really gotten quite used to the IDE. it will be very nice not to have to learn a new one once I go back to large clojure projects
04:35	TEttinger	(it's a mind-bending experience switching between VS's mostly sane shortcuts and IntelliJ's very odd defaults, like alt-f7)
05:37	lokien	Any good books/courses about cljs? I can't find anything useful
06:27	piotrts	hello
06:27	piotrts	is 4clojure down right now?
06:32	LuminousMonkey	Looks to be down: http://downforeveryoneorjustme.com/4clojure.com
06:39	piotrts	oh, thanks
10:21	visof	hi guys is clojars.org down?
10:22	beaky	it seems down to me too
10:22	beaky	no ping, cant curl, etc
10:24	visof	beaky: no alternatives?
10:24	beaky	i dont know :(
10:24	beaky	maven? :D
10:25	Frozenlock	I wonder if it's why I can't run lein in a project...
10:25	visof	Frozenlock: yep
10:26	visof	is there anyone of server maintainers here?
10:26	Frozenlock	surely there's a flag to disable the clojars check -_-
10:29	Frozenlock	there's that https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L127
10:33	Frozenlock	visof: https://twitter.com/clojars/status/681130080773472256
11:46	jonathanj	is there a convenient way to determine the length of an InputStream?
11:47	justin_smith	jonathanj: InputStream is an interface. I could easily make one that returns the same byte over and over forever.
11:48	justin_smith	.available tells you how many bytes are ready right now
11:48	jonathanj	how about a BufferedImage?
11:48	jonathanj	i'm reading an object from a PDF, all i want to know is how big the object is
11:48	jonathanj	so presumably it's not infinite
11:48	jonathanj	(using PDFBox, in case that's relevant)
11:49	justin_smith	how about getWidth and getHeight?
11:49	justin_smith	those should give you a very good idea of the size in pixels at least
11:49	jonathanj	yes, but that's mostly irrelevant
11:49	justin_smith	but it supports compressed formats, so...
11:49	jonathanj	exactly
11:50	jonathanj	i just want the length of the raw data contained by the object, but i can't figure out how to find that
11:51	jonathanj	the best i can come up with is clojure.java.io/copy the object's inputstream to a ByteArrayOutputStream and determine the size of the resulting array and then discard everything
11:51	justin_smith	once it's a BufferedImage I don't think you have the raw input any more? BufferedImage has a raster (totally uncompressed version) of the image
11:51	jonathanj	which seems like a lot of effort
11:52	jonathanj	https://pdfbox.apache.org/docs/2.0.0-SNAPSHOT/javadocs/org/apache/pdfbox/pdmodel/graphics/image/PDImageXObject.html
11:52	jonathanj	justin_smith: fair enough, perhaps a BufferedImage is going in the wrong direction then
11:53	justin_smith	jonathanj: you could try (-> pdfimage .createInputStream .available)
11:53	justin_smith	it could be that all of it would be available at once?
11:53	justin_smith	when you asked about inputstreams, well those can be connected to something like a network connection, you can't know how much data will come in until it comes in
11:53	justin_smith	but in this case I think more info is available about it
11:55	jonathanj	it feels like relying on that is a mistake though
11:55	jonathanj	available only dictates how much can be read without blocking
11:55	jonathanj	not how much is available to read in total
11:56	justin_smith	why would it block if all the data is right there in memory already?
11:56	justin_smith	really though, just read all the data and throw it away if you need to know the exact size, that's the only reliable way to know
11:58	jonathanj	justin_smith: well, if it's on disk the implementation might choose to lazily stream it, i mean there's no real guarantee that everything is actually in memory
11:58	jonathanj	so i think reading it all in and throwing it away is probably the only bet
11:58	justin_smith	why do you need to know the size?
12:00	jonathanj	i'm implementing a pdf crushing function, i'd like to start crushing the largest objects first, so i need to be able to determine which are the largest
12:03	jonathanj	okay, actually digging through the inheritance i found that `PDImageXObject`'s base class implements `getStream` which returns a `COSStream` which has a `getLength` method, i originally thought this method would return an InputStream
12:05	justin_smith	oh, cool
12:29	lokien_	Is boot any better than leiningen?
12:51	lokien_	Hello?
12:56	j-pb	It's me.
12:56	justin_smith	no, this is dog
12:56	j-pb	hahaha
12:57	j-pb	the only real advantage of slack over irc is giphy
12:58	lokien_	It's you I'm looking for, j-pb
12:58	j-pb	whas it it :)?
12:59	lokien_	Are you using boot? :(
12:59	j-pb	nope
12:59	j-pb	good old leiningen :)
12:59	j-pb	bood holds some promisies, but it's imperative nature doesn't justify the gains imho
12:59	lokien_	Bu-ut cljs tutorial uses boot and I'm super sad now
13:00	j-pb	yeah, it looks easier at first, but I rather write a bit more config that's declarative than magic imperative stuff :)
13:00	j-pb	cljsbuild is actually pretty easy to setup in leiningen once you got the hang of it
13:00	j-pb	all the config options ae dauntig at first but you only need a very small percent of all that
13:01	j-pb	lokien_: what is it that you're having trouble with :)?
13:01	lokien_	I'll check it out then. Is modern cljs a good tutorial for a noob?
13:02	lokien_	I wanted to lick some cljs, but I hit a brick wall
13:02	j-pb	to be honest I don't know
13:02	j-pb	i'd do lein new figwheel myprojectname -- --reagent
13:02	justin_smith	yes, this is patrik
13:02	lokien_	justin_smith to save the day
13:03	lokien_	As always
13:03	justin_smith	haha
13:03	j-pb	that sets up a figwheel project for you which means nicer dev flow
13:03	j-pb	and automatically makes it a reagent project as well
13:03	j-pb	with that you have everything running which is nice and you can do the rest by exploration I think :)
13:03	lokien_	j-pb: where did you learn like.. How to do cljs stuff? It's not the same as in clj an-
13:04	lokien_	Were you js developer earlier?
13:04	j-pb	time and persistence
13:04	j-pb	no clojure dev
13:04	j-pb	never touched js before
13:04	j-pb	tbh it's not that hard or much :)
13:04	lokien_	Good for you, it's a laxative for brains
13:05	j-pb	the hardest thing is the tooling
13:05	j-pb	and figwheel does 99% of that for you
13:05	lokien_	I have some troubles with learning. I have to understand something, I'm not able to memorize stuff without understanding the thing
13:06	lokien_	And I end up with 20 tabs in my browser and a headache
13:06	j-pb	understanding is relative
13:06	j-pb	you wont' understand the intricasies of the Js or jvm JIT
13:06	j-pb	but luckily you don't need to
13:06	j-pb	the gist of cljs is this
13:06	lokien_	Jvm=magic
13:07	lokien_	I like it to stay this way
13:07	j-pb	cljs --cljs compiler--> js --google closure--> executable js
13:07	lokien_	Yeah, the stuff I know!
13:07	j-pb	cljs has a somewhat naive clj to js compiler and relies on a lot of google closure goodness to optimize it
13:08	lokien_	If it's a bug in my cljs, I won't have to debug js? Just cljs, right?
13:08	j-pb	figwheel is a tool that automatically recompiles and reloads your files to a instance of your web applicatoin running
13:08	j-pb	lokien_: most of the time
13:08	j-pb	but not always
13:08	lokien_	Uhm, I think I saw guys making flappy bird with figwheel
13:08	j-pb	yeah
13:08	lokien_	j-pb: so I have to learn some js?
13:09	j-pb	nope
13:09	j-pb	not explicitly at least
13:09	j-pb	of course you will learn js, but at least I only learned what was nessecary as I debuged my clojure code
13:09	j-pb	there is no need to learn vanilla js first
13:09	lokien_	Okay then
13:10	lokien_	And I can use electron to make pretty gui stuff with it, right?
13:11	j-pb	ah well if you want to do desktop apps yeah :_
13:11	j-pb	:_
13:11	j-pb	goddamit :)
13:11	lokien_	:D
13:12	j-pb	however I found that it's somewhat nice to have a server running somewhere and then just use the browser
13:12	lokien_	My girlfriend is savage about my cli clojure apps, so I have to
13:12	justin_smith	lokien_: " I'm not able to memorize stuff without understanding the thing" -- yet you speak English!
13:12	justin_smith	or at least write it well
13:13	justin_smith	lokien_: were you trying to use clojure in the cli via lein?
13:13	lokien_	justin_smith: but my head ached for like 7 months, reading my first english books
13:14	lokien_	justin_smith: I've made some programs that ran in terminal
13:15	TEttinger	the JVM Clojure lib called seesaw, with the "insubstantial" styling stuff, isn't bad-looking
13:15	lokien_	I'm intrigued by quil
13:16	j-pb	not for gui stuff
13:16	TEttinger	yeah, quil doesn't do uh common anything for GUIs. I think you'd need your own text input boxes, copy/paste support...
13:17	TEttinger	play-clj has scene2D.ui as part of its wrapper around the java game lib libGDX. that has text input but not the best OS integration
13:18	TEttinger	(it will however outperform swing if you ever do anything animated)
13:18	TEttinger	(swing is the main java GUI lib)
13:19	TEttinger	I think JS on the desktop using electron or the like is a decent way to go.
13:19	TEttinger	there's also CEF
13:19	TEttinger	not sure if there's a decent clojure binding
13:20	lokien_	What is cef?
13:23	lokien_	Uh, chromium embedded framework, in c++
13:25	TEttinger	huh, this looks not bad https://github.com/karad/lein_template_descjop
13:25	TEttinger	lokien_: you'd be surprised how many apps use it
13:26	TEttinger	there's a binding for Java, wasn't sure if there was one for Clojure
13:26	lokien_	TEttinger: pretty logo, I'm sold
13:26	TEttinger	it's electron based, that descjop, but you can choose reagent or Om for how to handle whatever those are used for. react.js stuff
13:27	lokien_	Never used any of thiss stuff
13:27	lokien_	But reagent looks good
13:28	kenrestivo	it's got a learning curve, but it's very powerful
13:29	lokien_	That's what they said about emacs
13:29	hlolli	TEttinger, one fundemental question about Om. Is om next compleatly different from om. If so, would you recommend newcommer to learn om or om-next only?
13:30	TEttinger	I have never used Om or anything like it. paging justin_smith, justin_smith to the channel
13:31	lokien_	I've just googled "justin smith clojure" and man, those sideburns
13:32	justin_smith	hello
13:35	hlolli	hello Justin, I did the edn config file yesterday. Was wondering if you knew how to make leiningen extract the edn file to resources folder when you require a project from clojars in a fresh clojure project?
13:35	hlolli	it just sits in the .jar file in .m2 subdirectory, not much use if the user can't edit it.
13:44	justin_smith	hlolli: the common way to do this is to have a default inside the jar, use io/resource and spit in order to make a copy on disk on startup if it doesn't exist yet, then you load it if present
13:45	justin_smith	hlolli: or you can just expect them to make the file available, and tell them what should be in it
13:46	justin_smith	this is what lazybot does, for example
13:46	hlolli	yes, thougt so. Yes I can write io spit. But I guess I have to make a check that only to spit if file does not exist already.
13:46	justin_smith	exactly
13:47	hlolli	ok sounds like a solution.
13:58	justin_smith	TIL C has better support for static initialization of data structures with inline literals than java does
14:03	domgetter	When I watch conference talks about Clojure, I often see speakers evaluate a form in their text editor, and the result is shown in the repl. What do I need to look into to learn how to do this?
14:04	BRODUS	domgetter: i think CIDER for emacs has support for this
14:04	domgetter	BRODUS: Ah so I can't just do it with any IDE/text editor?
14:05	BRODUS	you could send a form to the repl or you could overlay the result into the buffer
14:05	domgetter	other than copy-pasting the form, what do you mean "send a form to the repl"
14:06	BRODUS	like evalute the expression immediately behind my cursor and show the output in the repl
14:07	BRODUS	assuming you have two views open, one is the file youre editing and the other is the repl
14:07	ridcully_	i'd assume, that any editor, that "support" clojure, can do this
14:07	domgetter	"like evalute the expression immediately behind my cursor and show the output in the repl " Are you still talkinga bout what can be done with CIDER for emacs, or are you speaking generally?
14:07	ridcully_	in vim-fireplace it's :Eval and cpp
14:08	justin_smith	domgetter: what you wwant to look for, generally, is "nrepl bindings", this is how most editors interact with clojure inside the editor.
14:08	BRODUS	i was speaking about emacs, but there should be something similar in a clojure supported IDE
14:08	domgetter	Also I have no idea what "overlay the result into the buffer" means. Do you have any resources I could read up on?
14:08	justin_smith	domgetter: cursive, emacs, light-table, and vim are the best working examples of this I know of
14:10	BRODUS	domgetter: sorry for the confusion, in emacs a 'buffer' is a view, its usually filled with the text you're editiing
14:11	domgetter	BRODUS: yea, I'm coming at this with zero knowledge of emacs.
14:12	domgetter	Thank you for your input, everyone :)
14:13	jonathanj	using transducers with maps seems a bit awkward
14:14	jonathanj	like, if you want to filter by some property of the value, you have to write all your xforms like (filter (fn [[_ v]] (regular-predicate v))) to "lift" the value out of the map
14:15	justin_smith	jonathanj: or (filter (fn [e] (predicat (val e)))
14:15	justin_smith	or (filter (comp predicate val))
14:15	jonathanj	that is a little nicer but still
14:16	jonathanj	that works for filter, but what about map?
14:16	jonathanj	like if you want to preserve the key but alter the value
14:16	justin_smith	really depends on what you want the map to return - more entries?
14:16	justin_smith	sorry, lag here
14:17	justin_smith	so yeah, then you can destructure, or use key / val - what is the easy and convenient alternative that clojure isn't doing? is there another syntax that would be better?
14:17	domgetter	justin_smith: So I told LightTable to connect to an existing nrepl at localhost:54525 but when I evaluate (println "hello"), nothing happens in the repl in my command prompt.
14:17	jonathanj	so if you want to only transform the values it gets ugly because you need to add (into {}) in too
14:18	justin_smith	domgetter: typically with nrepl your result is visible on the client side, not the server side
14:18	jonathanj	i'm surprised because i would have expected this to be pretty common and usually Clojure is really good about making common things easy or obvious
14:18	justin_smith	jonathanj: maybe it's just stockholm syndrome but I'm not picturing the easier thing - what would it look like?
14:19	domgetter	justin_smith: In the conference talks, they're evaluating forms in their text editor, and the result is magically appearing in the repl, not the text editor
14:19	justin_smith	this isn't a repl inside their editor?
14:20	domgetter	I ran lein repl in a command prompt, and told LightTable to connect to the nrepl server that lein made
14:20	domgetter	or are you talking about the conf speakers
14:20	justin_smith	domgetter: I didn't ask what you did, I asked what they did
14:20	jonathanj	justin_smith: well the xf would maybe look something like: (comp (filter (comp this-one? val)) (map-vals inc))
14:20	domgetter	justin_smith: https://www.youtube.com/watch?v=enwIIGzhahw&t=6m6s
14:20	justin_smith	domgetter: typically people have a repl inside the editor
14:21	domgetter	okay so they were never connecting to an external repl AND evaluating forms that showed up in it?
14:21	justin_smith	domgetter: yeah, that repl is part of his editor
14:21	domgetter	ah okay. That was my fundamental confusion
14:22	justin_smith	domgetter: well, the weird part is that they ARE connected to an nrepl server
14:22	justin_smith	but usually it is implicitly started, and all results show up in their editor
14:22	jonathanj	,(sequence (map (comp inc val)) {:a 1})
14:22	clojurebot	(2)
14:22	domgetter	okay, okay
14:22	domgetter	awesome, thank you for clearing that up for me
14:22	justin_smith	domgetter: light table makes it very easy to eval clojure code inside the editor - it's a bit clumsy at some stuff, but that is something it is very good at
14:23	jonathanj	looks like (sequence) turns it into a sequence
14:23	justin_smith	jonathanj: right, and your (comp inc val) ensures you wont get the full entry, just the val
14:24	justin_smith	,(
14:24	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
14:24	justin_smith	,,(into {} (map (juxt key (comp inc val))) {:a 1})
14:24	clojurebot	{:a 2}
14:25	justin_smith	seems like a "transduce-val" would help there, yeah
14:26	justin_smith	jonathanj: "sequence" basically exists because (into () ...) reverses
14:26	justin_smith	afaik
14:28	jonathanj	and if i wanted to transform my map from {:a 1} to {:a [1 (inc 1)]}?
14:28	jonathanj	maybe i'm trying to do this the wrong way around, but i don't really see a better option
14:29	domgetter	,(into {} (map (fn [[k v]] [k [v (inc v)]]) {:a 1 :b 2}))
14:29	clojurebot	{:a [1 2], :b [2 3]}
14:29	domgetter	Is that the output you want?
14:29	jonathanj	yes, but not the syntax i want
14:30	justin_smith	,(defn map-vals [f] (map (juxt key (com f val))))
14:30	clojurebot	#error {\n :cause "Unable to resolve symbol: com in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: com in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: com in this conte...
14:31	justin_smith	,(defn map-vals [f] (map (juxt key (comp f val))))
14:31	clojurebot	#'sandbox/map-vals
14:31	justin_smith	,(into {} (map-vals inc) {:a 0 :b 21})
14:31	clojurebot	{:a 1, :b 22}
14:32	justin_smith	it becomes less flexible if you bake the into part in too, imho
14:38	jonathanj	i think i ask this pretty often
14:38	jonathanj	what's the most efficient way to get the last element of something?
14:38	domgetter	,(transduce (map (fn [[k v]] [k [v (inc v)]])) conj {} {:a 4 :b 5 :c 6})
14:38	clojurebot	{:a [4 5], :b [5 6], :c [6 7]}
14:39	domgetter	jonathanj: is that syntax still "bad"?
14:39	justin_smith	jonathanj: for a vector, it's peek
14:39	jonathanj	justin_smith: and a list? `last`?
14:39	justin_smith	"best" "only" meh
14:40	justin_smith	if you have to look at the last thing, avoid using a list / seq
14:40	jonathanj	maybe it's best to construct my thing in reverse then
14:40	jonathanj	putting something at the head of a list/vec is efficient and is always `cons`?
14:41	justin_smith	putting something at the head of a list is efficient, putting something at the end of a vec is efficient
14:41	domgetter	jonathanj: putting at the head of list is constant and you can do it with cons or conj. putting at the tail of a vec is constant and you use conj
14:41	domgetter	*near constant
14:42	jonathanj	,(first (conj (list 4 5 6) 1))
14:42	clojurebot	1
14:42	domgetter	i.e. technically logarithmic but with a branching factor of 32
14:42	jonathanj	,(first (conj (vector 4 5 6) 1))
14:42	clojurebot	4
14:42	domgetter	jonathanj: conj adds into a collection however it is efficient to do so
14:42	TEttinger	so who's been looking at the CHAMP tries for clojure...
14:43	domgetter	so for lists it's at the front, for vecs it's at the end
14:43	domgetter	and of course, for sets and maps, it's wherever because there's no order
14:51	jonathanj	how do i reverse the sort order of sort or sort-by?
14:53	ridcully_	,(sort-by identity #(compare %2 %1) [42 23 666])
14:53	clojurebot	(666 42 23)
14:54	jonathanj	thanks
14:54	TEttinger	nice choices all around
14:55	jonathanj	found this too, which goes a little further: https://groups.google.com/forum/#!msg/clojure/VVVa3TS15pU/9WrN_9Mfao4J
14:59	justin_smith	,(sort (comp - compare) [1 2 42 3 4 -1]) ; easiest reverse sort, I think
14:59	clojurebot	(42 4 3 2 1 ...)
15:00	justin_smith	sorry, I'm doing some C for a personal project, so my clojure code's gonna be nothing but juxt, comp, partial...
15:04	TEttinger	,(sort #(compare %2 %) [42 23 666])
15:04	clojurebot	(666 42 23)
15:05	TEttinger	,(sort-by > compare [42 23 666])
15:05	clojurebot	(42 23 666)
15:05	TEttinger	no idea what that does
15:05	justin_smith	TEttinger: clearly nothing useful
15:05	TEttinger	(doc sort-by)
15:05	clojurebot	"([keyfn coll] [keyfn comp coll]); Returns a sorted sequence of the items in coll, where the sort order is determined by comparing (keyfn item). If no comparator is supplied, uses compare. comparator must implement java.util.Comparator. If coll is a Java array, it will be modified. To avoid this, sort a copy of the array."
15:06	TEttinger	(doc sort)
15:06	clojurebot	"([coll] [comp coll]); Returns a sorted sequence of the items in coll. If no comparator is supplied, uses compare. comparator must implement java.util.Comparator. If coll is a Java array, it will be modified. To avoid this, sort a copy of the array."
15:06	TEttinger	,(sort-by - [42 23 666])
15:06	clojurebot	(666 42 23)
15:06	TEttinger	golf win!
15:06	justin_smith	only works on numbers though
15:07	TEttinger	,(sort-by - ["A" "B" "c"])
15:07	clojurebot	#error {\n :cause "java.lang.String cannot be cast to java.lang.Number"\n :via\n [{:type java.lang.ClassCastException\n :message "java.lang.String cannot be cast to java.lang.Number"\n :at [clojure.lang.Numbers minus "Numbers.java" 104]}]\n :trace\n [[clojure.lang.Numbers minus "Numbers.java" 104]\n [clojure.core$_ invokeStatic "core.clj" 1018]\n [clojure.core$_ invoke "core.clj" -1]\n [clo...
15:07	TEttinger	aw
15:07	TEttinger	I thought it would call compare
15:08	sdegutis	Hi
15:08	sdegutis	!
15:08	jonathanj	is there a cider command to set the previously executed repl command as the current repl text?
15:09	jonathanj	the only way i know how to do it is position my cursor on the previous command and hit enter
15:09	hlolli	Im trying to access this resource: /home/hlolli/.m2/repository/org/clojars/hlolli/panaeolus/0.2.0-RELEASE/panaeolus-0.2.0-RELEASE.jar/samples/kicks/kick1.wav but obviously from my API (csound) wont find it trough /src/samples/kicks/kick1.wav how would I best go about accessing this .wav file?
15:09	TEttinger	,(rseq(sort["A" "B" "c"]))
15:09	clojurebot	#error {\n :cause "clojure.lang.ArraySeq cannot be cast to clojure.lang.Reversible"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.ArraySeq cannot be cast to clojure.lang.Reversible"\n :at [clojure.core$rseq invokeStatic "core.clj" 1513]}]\n :trace\n [[clojure.core$rseq invokeStatic "core.clj" 1513]\n [clojure.core$rseq invoke "core.clj" -1]\n [sandbox$eval169 invokeS...
15:09	jonathanj	(which is awful)
15:09	TEttinger	gah
15:09	TEttinger	hlolli: looks like that's a resource
15:10	TEttinger	http://clojuredocs.org/clojure.java.io/resource
15:10	hlolli	yes, this is a resource, and cloujre will find it. But my api will not.
15:11	TEttinger	what do you mean?
15:11	TEttinger	what are you trying to do, first
15:11	TEttinger	are you making an API for csound?
15:12	hlolli	So this is an audio sample that I need csound to load into a table. I already am able to load it in my devel project, but now I want to create a clojar for my friends to use, just by using :dependencies.
15:13	hlolli	so when I do $lein new project and add :dependencies, the folder tree of course will look entirely different from ex. pulling from github.
15:13	TEttinger	so you want to make the resource available to people using your library?
15:13	TEttinger	I think by default it is
15:13	hlolli	yes
15:13	TEttinger	they need to know where it is in the jar I guess
15:14	TEttinger	it's simple enough to expose the resource with a "getter" like fn
15:14	TEttinger	(assuming you can modify the lib)
15:15	TEttinger	(basically as long as there isn't some final version up I mean)
15:15	hlolli	well, these are many many samples. Im leaning towards not including the audio samples in clojar and make a script to download it specifically.
15:16	hlolli	Or just copy it from the clojar, then users will have two copies, not cool disk efficiency. Using directly trough to jar file would be ideal.
15:28	TEttinger	hlolli: maybe the samples could be in separate dependencies, grouped by some quality (which instrument maybe?)
15:30	hlolli	ok, I think I've found what my misunderstanding was. So I use io.resource for extracting the string, and as far as I see, it will start with "jar:file...etc.." if the resource is from jar otherwise normally from git pull folder.
15:30	justin_smith	hlolli: that's just the printed form of the resource handle - but when you read from it you will get the contents of the file
15:31	TEttinger	your "git pull folder" should have a resources directory, where these samples are
15:31	hlolli	yes, but this path here would work fine? "jar:file:/home/hlolli/.m2/repository/org/clojars/hlolli/panaeolus/0.2.1-alpha/panaeolus-0.2.1-alpha.jar!/samples/kicks/kick1.wav"
15:32	TEttinger	that !/ is a bit odd
15:32	hlolli	it's from non-dev repl (prn (io/resource "samples/kicks/kick1.wav"))
15:33	hlolli	well, only one way to find out if this path functions
15:33	TEttinger	prn is going to print the string representation, not necessarily a valid path
15:33	TEttinger	I have no idea if you can reconstruct a file from what pr prints
15:34	hlolli	yes say (str "this is a csound string that needs path: " (io/resource "samples/...etc"))
15:35	hlolli	no I take the prn out of course :)
15:35	TEttinger	uh hm. there, you're calling .toString on the resource when you use str
15:35	TEttinger	which may give different output from what pr prints
15:35	hlolli	(io/resource "samples/kicks/kick1.wav") returns #object[java.net.URL 0x5f32e673 "jar:file:/home/hlolli/.m2/repository/org/clojars/hlolli/panaeolus/0.2.1-alpha/panaeolus-0.2.1-alpha.jar!/samples/kicks/kick1.wav"]
15:36	TEttinger	,(print {:a 1 :b "\\\""})
15:36	clojurebot	{:a 1, :b \"}
15:36	hlolli	yes, I sure dont want this #object crap around it.
15:36	TEttinger	,(pr {:a 1 :b "\\\""})
15:36	clojurebot	{:a 1, :b "\\\""}
15:36	TEttinger	yeah, you're trying to print a file
15:36	justin_smith	TEttinger: in a repl started from /home/justin/bench.jar this returns the full ns contents as expected (slurp "jar:file:/home/justin/bin/bench.jar!/clojure/java/io.clj")
15:37	TEttinger	woo justin_smith
15:37	justin_smith	that returns the full text of the namespace
15:37	justin_smith	so yeah, hlolli, that path string looks good, for accessing something inside a jar
15:37	TEttinger	ok, pr-str should get you a path string
15:37	TEttinger	print won't I think, it will do that #object literal
15:38	justin_smith	slurp won't be the right thing, since it's not a text file - but you can read from it and then write to a file
15:38	hlolli	yes, I give it a try, of course just returning a string is what I want, don't print anything
15:38	TEttinger	,(count (pr-str {:a 1 :b "\\\""}))
15:38	clojurebot	17
15:39	justin_smith	hlolli: this gist shows how to extract files from a jar - you should be able to use some of what's demonstrated there to write out a wav file from a jar
15:39	justin_smith	https://gist.github.com/noisesmith/b4a57a3154b736e2f9c1
15:39	hlolli	ok cool, now I slurped the wav file, emacs frozen :)
15:40	justin_smith	as I said, slurp won't work properly because it's not a text file
15:40	justin_smith	and emacs hates lines that long, they make it freeze up
15:40	hlolli	hehe, no harm in this case
15:51	sdegutis	Hi!
16:30	BRODUS	say if i had (transduce (comp (filter odd?) (map inc)) + (range 5)), does transduce send the elements of its collection one by one through supplied transducer and accumulates with +, or does it pass the whole collection through each transducer then perform a final reduce operation?
16:40	scottmsul	In clojure, "partial" curries arguments from the left. Is it possible to curry arguments from the right? It wouldn't be hard to write, just wondering if clojure has a built-in function.
16:41	justin_smith	that isn't built in, and partial is not the same as currying
16:41	justin_smith	(there are also libs that provide currying)
16:42	TEttinger	,(defmacro ??????
16:42	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
16:49	TEttinger	sighing... I don't understand the sandbox for clojurebot
16:49	TEttinger	any macro macro seems to fail
16:49	TEttinger	,(defmacro חֶלקִי [f & args] (fn [& args2] true))
16:49	clojurebot	#'sandbox/חֶלקִי
16:49	TEttinger	,((חֶלקִי map [1 2 3]) inc)
16:49	clojurebot	#error {\n :cause "EvalReader not allowed when read-eval is false."\n :via\n [{:type java.lang.ExceptionInInitializerError\n :message nil\n :at [sun.reflect.NativeConstructorAccessorImpl newInstance0 "NativeConstructorAccessorImpl.java" -2]}\n {:type java.lang.RuntimeException\n :message "EvalReader not allowed when read-eval is false."\n :at [clojure.lang.Util runtimeException "Util....
16:49	firstdayonthejob	is there any way to set the anti-forgery token in ring from client-side using plain jquery for a POST?
16:52	justin_smith	TEttinger: yeah, works locally, must be some bot weirdness
16:53	TEttinger	I mean, I'm very happy hiredman has figured out how to allow defmacro at all! I just wish I understood how it worked a bit better
16:57	hlolli	Well Justin, I've hit a wall in this path quest. I think your extract function will be ideal solution. But how can I locate the path the the dependency .jar file from maven repositories that can be located from all users with different setup.
16:58	hlolli	Maybe I say fuck this, add a wget-ish function to just download the samples to a subdirectory.
16:59	hlolli	well, nevermind. I think I will just do that. The obvious thing that I missed out, that when a file is inside a .jar it's not a useable file.
16:59	hlolli	(from other sources than java/clojure)
17:08	justin_smith	hlolli: you wouldn't need that whole extract function - really it's just a loop that reads a buffer from your resource then writes it to a file. You just can't use the character oriented methods, you need the binary ones.
17:19	TEttinger	,(sort ‍[1 2 3 4 5])
17:19	clojurebot	(5 4 3 2 1)
17:19	TEttinger	,(sort [1 2 3 4 5])
17:19	clojurebot	(1 2 3 4 5)
17:20	TEttinger	,(sort ‍"ABC")
17:20	clojurebot	(\C \B \A)
17:21	TEttinger	justin_smith: more fun with unicode
17:23	justin_smith	~TEttinger is a gaslighting unicode monster.
17:23	clojurebot	A nod, you know, is as good as a wink to a blind horse.
17:25	TEttinger	justin_smith: I'm looking into http://unicode.org/reports/tr51/#Emoji_Modifiers_Table for when java 9 gets emoji support
17:26	justin_smith	TEttinger: some of those diagrams are really odd taken out of context
17:30	ridcully_	that will be glorious! :darmok:&:jalad:@:tanagra:
17:31	TEttinger	,(reduce 💋‍ [1 2 3])
17:31	clojurebot	6
17:37	TimMc	The Unicode Consortium should just cancel emoji. :-/
17:38	TimMc	I'm all for the selectable skin color if we're going to have little pictures, but do they not realize how complicated this is going to get later?
17:39	TEttinger	,(🐷 💋‍ 1 2 3 4)
17:39	clojurebot	Oink. 10
17:40	TimMc	Someone's going to want the money bag to show a yen symbol instead of $; someone will want the calendar to show a specific date; someone will want the clocks to allow more precision.
17:40	TEttinger	24-hour clocks
17:40	TimMc	you know it
17:40	justin_smith	TimMc: skip to the year 2050, unicode consortium is defining a standard for puppy gifs as part of a character set. Kitten gifs are already fully implemented and widely supported.
17:41	TEttinger	TimMc: http://www.ebay.com/itm/RUSSIAN-WATCH-SOUVENIR-USSR-STALIN-NEW-24HOURS-WA-67-/301819647052?hash=item4645da544c:g:MkcAAOxygKZSRqAD
17:41	TEttinger	justin_smith: doge standard
17:41	TimMc	2060: 3 deaths have been attributed to a fight over whether :jackdaw: and :crow: should be merged.
17:42	TEttinger	2062: the unicode consortium is threatened by civil war.
17:42	justin_smith	haha
17:43	TimMc	TEttinger: I saw a 24 hr analog clock when I was visiting Akamai.
17:43	TEttinger	Abrahim Linc💋‍ln stands little hope of reuniting with the punicode confederacy.
17:43	TEttinger	what is akamai's business again? trackers?
17:44	TEttinger	or were they like cloudflare?
17:44	TimMc	CDN and caching
17:44	TEttinger	ah ok
17:44	justin_smith	TEttinger: I think they did caching
17:44	justin_smith	yeah
17:44	TimMc	Very big player.
17:45	TEttinger	apparently cloudflare is taking over luajit now that mike pall is leaving (or so he says)
18:05	ahhh	https://doyle.ninja/limechat-crash.gif
18:18	noncom\|2	all fun is that emoji hassle
18:19	noncom\|2	cool if by 2050 we'll have a symbolic alphabet to describe almost anything
18:19	noncom\|2	does not it look like history repeats itself with all the hieroglyphic things ?
18:20	p_l	... reminds me of a sci-fi story where a linguistic experts talks about how "letter 'L', which means to load into computer, used to be part of the word 'load'"
18:20	noncom\|2	honestly, i think that a refined set of pictograms would do for better intefaces
18:20	noncom\|2	p_l: haha, yeah
18:21	noncom\|2	also reminds me of Blindsight (the novel by Peter Watts) :D
18:22	noncom\|2	actually, emojis serve as a means for the quest of the structure of consciousness and intellect.
18:22	noncom\|2	what if a real AI can only be programmed with emojis ?
18:32	ridcully_	wasn't it l,shift-o to shortcut load on the c64?
19:19	ben_vulpes	blindsight was amazing
19:50	noncom\|2	yeah, i'm going through echopraxia now :) it's going to be a trilogy btw
19:51	BRODUS	how would I type this shortcut?
19:51	BRODUS	nvm wrong channel
21:31	breezeli	any one here?
21:31	domgetter	I'm here
21:33	breezeli	i just start learning clojure ,read book clojure programing
21:34	breezeli	An example does not understand
21:34	breezeli	Can you help me to disassemble it
21:34	domgetter	I can try. What's the problem?
21:35	breezeli	Wait a moment
21:36	breezeli	(reduce
21:36	breezeli	(fn [m v]
21:36	breezeli	(assoc m v (* v v)))
21:36	breezeli	{}
21:36	breezeli	[1 2 3 4])
21:36	breezeli	this
21:38	breezeli	Can you help me to disassemble it,Turn into no "reduce" format
21:38	domgetter	That does something like the following: (assoc (assoc (assoc (assoc {} 1 (* 1 1)) 2 (* 2 2)) 3 (* 3 3)) 4 (* 4 4)) which would make {1 1 2 4 3 9 4 16}
21:39	domgetter	it associates each value with its square
21:39	domgetter	breezeli: what language are you most familiar with?
21:40	breezeli	Chinese
21:40	breezeli	thank you Let me think about it.
21:41	domgetter	breezeli: I meant what programming language. I can write it in a different programming language to help you understand
21:41	breezeli	c# or java
21:42	breezeli	hoho! Clojure is hard to get
21:42	justin_smith	it's a lot like for(i in [1 2 3 4]) { m.put(i, i*i);}
21:42	justin_smith	except our maps are not mutable, so you can't actually do that
21:43	breezeli	thank you
21:43	justin_smith	breezeli: the important difference is you don't mutate the values in reduce - you return a new value for each step
21:43	domgetter	breezeli: Here is something to help you understand reduce: (reduce + [1 2 3 4]) == (((1 + 2) + 3) + 4)
21:45	breezeli	I try to understand, this book is too jumping
21:45	domgetter	You can have an "initial value" (reduce + 0 [1 2 3 4]) == ((((0 + 1) + 2) + 3) + 4)
21:45	breezeli	thank all
21:48	breezeli	Now clear! thank all,i love you
21:48	domgetter	breezeli: Here is some java that is similar: https://gist.github.com/domgetter/93609123c0b8155220e8
21:49	breezeli	thanks you
22:49	domgetter	What's the best way to remove the last character from a string?
22:49	justin_smith	,(let [s "hello, worldo"] (subs s 0 (dec (count s))))
22:49	clojurebot	"hello, world"
22:50	domgetter	I'll go look up subs. Thank you
22:50	justin_smith	count s is constant time (since strings are a counted type), so that should be the fastest option
22:50	domgetter	oh it's just the substring. Got it, derrr
22:52	domgetter	How would you recommend I address the edge case of an empty string?
22:52	domgetter	(subs "" 0 (dec count "")) is a StringIndexOutOfBoundsException. Just wrap in an if?
22:52	justin_smith	(subs "" 0 (max 0 (dec count "")))
22:52	justin_smith	kind of ugly, but works
22:52	domgetter	ah ha!
22:52	justin_smith	and not slow
22:53	domgetter	I prefer the declarative route when I can. Thanks!
22:53	justin_smith	also, it doesn't handle nil
22:54	domgetter	I'll keep that in mind. In this case, the atom is always a string, but you never know...
22:54	justin_smith	(some-> ...) is good for short circuiting nil
22:56	domgetter	Is (apply str (butlast "hello")) slower?
22:56	justin_smith	yes, by at least 100x
22:56	justin_smith	I mean if that doesn't matter, it doesn't matter
22:56	domgetter	right
22:56	domgetter	but is it slower due to constant factors or linear sequence generation
22:57	domgetter	cause it would seem like both solutions are "linear"
22:57	justin_smith	allocation churn, lazy sequence, constructing a large number of short lived Char objects...
22:57	justin_smith	it's a linear factor of about 100x
23:05	justin_smith	domgetter: some hard numbers to back up what I was saying https://gist.github.com/noisesmith/71b0c6c8d48c91fcb30d
23:06	justin_smith	,(/ 2565.0, 62.72)
23:06	clojurebot	40.89604591836735
23:07	justin_smith	OK, so not quite a hundred time slower
23:07	justin_smith	only 40 times slower :P
23:11	domgetter	Yea I did a few in a repl and the butlast version grew linearly but the count version stayed around the same time no matter the input length
23:12	justin_smith	sounds about right
23:12	domgetter	so it's probably logarithmic
23:12	justin_smith	strings are immutable, but subs can still pull some magic with the underlying java stuff
23:12	domgetter	I know of the #_ reader macro to ignore the next form. Is there one to ignore the next two forms for maps and bindings?
23:12	domgetter	like #__ or something?
23:12	justin_smith	#_#_
23:13	justin_smith	,(+ #_#_ dog cat 2 2)
23:13	domgetter	awesome. I was putting #_ individually
23:13	clojurebot	4
23:13	domgetter	do they stack?
23:13	justin_smith	domgetter: some people really don't like stacked #_, but I think in a hash map it makes sense
23:13	justin_smith	yes
23:13	domgetter	can I put an arbitrary number?
23:13	justin_smith	please don't
23:13	justin_smith	readers will hate you
23:13	domgetter	I'll stick to two, I promise :P
23:14	domgetter	I have a cond and I'm testing things so I'm ignoring pairs
23:15	justin_smith	makes sense, yeah, #_#_ is handly for that, or a ky / val in a map
23:15	justin_smith	or in let
23:15	domgetter	yea and loop bindings
23:15	domgetter	But I usually don't go too hogwild in those
23:16	justin_smith	in unrelated news, I finished a project in C this weekend - a GUI display that runs on the linux framebuffer (or in an X window) as an output-only display for a synth running on the raspberry pi
23:41	domgetter	That sounds pretty neat. Are you using it for debug purposes at first?