#clojure – 2015-04-12

2015-04-12

00:46	lexi-lambda	Are any of Trammel, clojure-contracts, or core.contracts commonly used?
00:47	LaVidaPortland	Not that I've seen, but I'm pretty new to clojure.
00:48	lexi-lambda	What is the usual way of ensuring preconditions, then?
00:48	lexi-lambda	I.e., if I have a function that requires a string, what's the idiomatic way to guard against something else getting passed in?
00:50	LaVidaPortland	Not sure, but what about using type hints for that scenario?
00:50	lexi-lambda	Of course, the usual Java approach for non-type-based preconditions would be if (n < 0) throw something;, but that seems like clutter compared to a good contracts system.
01:31	nuwanda_	lexi-lambda: you could use :pre to test the args type
01:48	justin_smith	hell, I've seen "if we're counting the number of elements in a linked list, and this is the last element, throw something" in java
01:51	adu	justin_smith, wut
01:51	justin_smith	adu: it was in the .length method for LinkedList in an old openjdk
01:51	justin_smith	hell, it may still be there
01:59	adu	justin_smith, there is no length method for LinkedList
01:59	adu	justin_smith, did you mean size()?
02:06	justin_smith	adu: clearly I misremembered
04:08	Fare	is there a disassembler to look at the JVM bytecode produced by clojure?
04:10	TEttinger	Fare: javap should be included with your JDK
04:10	TEttinger	http://www.theserverside.com/news/1363881/The-Working-Developers-Guide-to-Java-Bytecode
04:11	Fare	I'd like to see how much better the code is than a naive interpreter... and maybe convince colleagues to rely on that technology instead of reinventing it, badly
04:12	TEttinger	oh wow
04:16	Fare	wow?
04:19	TEttinger	Fare, it's just that seems like a very bad idea to try to make your own interpreter from scratch when you already have a repl for clojure that actually does benefit from the JIT
04:20	TEttinger	unless it adds some very much-needed features
04:20	sveri	ambrosebs: ping
04:20	Fare	well, the interpreter is not exactly for clojure
04:20	TEttinger	ah
04:20	Fare	but I'm writing a compiler in clojure targetting clojure
04:20	TEttinger	could it be written as an internal DSL?
04:21	Fare	not sure what you mean.
04:21	Fare	The source language is some python-like language
04:22	TEttinger	internal DSL as in, a domain specific language that's made with macros or whatever but ends up, once macroexpanded, as perfectly viable source in another language (hopefully clojure)
04:22	TEttinger	ah
04:22	Fare	and it has to integrate into a java application.
04:22	TEttinger	ah.
04:23	TEttinger	sounds like "fun"
04:23	Fare	"indeed"
04:23	TEttinger	the compiler sounds like the best option by far
04:23	Fare	duh
04:25	TEttinger	if you can maybe figure out a way to compile in separate units of code (like a method that corresponds to a single form in clojure), you could call your compiler on such a unit of code and pass it in to a running clojure repl
04:26	Fare	coming from CL, I really enjoy the clojure data model and its concurrency model. I think its paucity of control structures sucks, though.
04:26	Fare	it's a survivable suckiness, especially with higher-order functions, but still.
04:27	Fare	I understand that direct integration with the substrate language "justifies" this paucity, but it still hurts.
04:27	TEttinger	so they type in, myFoo = "bar"<hits enter> then your compiler compiles that to your clojure equivalent, say, (def myFoo (atom "bar")), thrusts it into the repl, and runs it
04:27	Fare	basically
04:28	TEttinger	I haven't had any issues with a lack of control structures tbh
04:28	Fare	though a compiler is only interesting if the compiled files are cached.
04:28	Fare	if it were a run-once kind of thing, the interpreter would make more sense.
04:28	TEttinger	right, this might have to be a separate thing huh
04:28	TEttinger	having macros does make control structures fairly convenient to work with though
04:29	Fare	yes, macros and higher-order functions help survive that.
04:29	TEttinger	I'm not sure if you mean something different from doseq, for, loop/recur, etc.
04:30	Fare	and you can emulate delimited continuations in userland. But then, you can't interact well with other people's code, and pay a hefty price in performance.
04:32	Fare	compared to CL's loop's, its lexical block/return, or (yuck) tagbody/go, clojure is a bit poor. But yes, it does make it up in other ways.
04:33	Fare	handler-bind is also a big thing I miss from CL. Not obvious how you'd do it on the JVM though
09:29	sobel	justin_smith: btw i found my emacs package issue. melba repo had to be manually added.
10:12	sobel	d'oh. calling System/exit affects my repl.
10:22	justin_smith	you don't say?
10:24	justin_smith	sobel: System/exit is how I usually shut down my vm
10:31	justin_smith	$mail Fare many people use no.disassemble to read the clojure bytecode output, and also the bytecode is generated with a lib called asm
10:31	lazybot	Message saved.
10:42	matthavard	I'm using the byte-streams library (https://github.com/ztellman/byte-streams) to read a file into a byte array. In my file, foo.html, there is a character/byte that has a value of 0x92 (146 decimal), which I have verified using a hex editor, but if I do `(map int (to-byte-array (java.io.File. "foo.html")))`, the integer at the corresponding position of the character is -110
10:43	justin_smith	matthavard: there are no unsigned bytes in java
10:44	matthavard	Hah yeah I just thought about that. It overflows to -100
10:44	justin_smith	,(- 146 127)
10:44	matthavard	*-110
10:44	clojurebot	19
10:45	justin_smith	matthavard: yeah. The no unsigned thing makes java stuff with bytes a little painful sometimes.
10:45	justin_smith	it's the same 8 bits...
10:46	justin_smith	there's probably a good trick for taking a byte and returning the int you would get for those 8 bit values, with all other bits being 0
10:46	justin_smith	,(bit-and -128 256)
10:46	clojurebot	256
10:46	matthavard	,(bit-and -128 -110)
10:46	clojurebot	-128
10:47	afhammad	can someone take a look at this compile time error for me, its probably something silly https://www.refheap.com/99531
10:47	justin_smith	,(bit-and -110 256)
10:47	clojurebot	256
10:47	justin_smith	ergh
10:47	justin_smith	oh, two's complement
10:47	justin_smith	,(bit-and (bit-xor -110 256) 256)
10:47	clojurebot	0
10:47	justin_smith	anyway, I bet there is some trick, maybe after I wake up more
10:51	justin_smith	,(defn uns [b] (if (pos? b) b (dec (* -1 (bit-xor b 255)))))
10:51	clojurebot	#'sandbox/uns
10:51	Uruviel	Hey! I'm using the Buddy wrap-access-rules. Currently I have a seq of rules like [{:uris ["/projects/:project-id"] :handler owns-project?}], but when inspecting the request map in owns-project? the project-id is not in the params (it's empty, in fact)
10:51	justin_smith	,(uns -110)
10:51	clojurebot	146
10:51	justin_smith	matthavard: ^
10:51	Uruviel	is there a way to make buddy-auth parse out the params?
10:52	justin_smith	matthavard: definition for "uns" is up there if you scroll up a little
10:57	matthavard	thanks justin_smith
10:57	matthavard	uns for un-sign?
10:57	justin_smith	haha, yeah
10:57	justin_smith	terrible name
10:58	justin_smith	but better for a one liner
10:58	matthavard	ha it's great.
10:58	matthavard	,(uns -110)
10:58	clojurebot	#error{:cause "Unable to resolve symbol: uns in this context", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.RuntimeException: Unable to resolve symbol: uns in this context, compiling:(NO_SOURCE_PATH:0:0)", :at [clojure.lang.Compiler analyze "Compiler.java" 6535]} {:type java.lang.RuntimeException, :message "Unable to resolve symbol: uns in this context", :at [clojure.l...
10:59	justin_smith	matthavard: clojurebot unloads definitions fast
10:59	matthavard	,(sandbox/uns -110)
10:59	clojurebot	#error{:cause "No such var: sandbox/uns", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.RuntimeException: No such var: sandbox/uns, compiling:(NO_SOURCE_PATH:0:0)", :at [clojure.lang.Compiler analyze "Compiler.java" 6535]} {:type java.lang.RuntimeException, :message "No such var: sandbox/uns", :at [clojure.lang.Util runtimeException "Util.java" 221]}], :trace [[clojure....
10:59	justin_smith	,(defn uns [b] (if (pos? b) b (dec (* -1 (bit-xor b 255)))))
10:59	clojurebot	#'sandbox/uns
10:59	matthavard	,(uns -110)
10:59	clojurebot	146
10:59	matthavard	ha awesome
10:59	justin_smith	with a little extra fiddling, it could take an optional bit-count arg
10:59	justin_smith	to work on shorts, ints, longs
11:02	justin_smith	hmm, shorts and ints is easy, longs is tricky...
11:04	matthavard	Is there a way to read 0x92 as a unicode character and get the correct value? 0x92 is unicode for some weird right quote thing, and I'm trying to convert all non-ascii characters to html entities like ""
11:06	matthavard	like (let [c (int (unicode (get-char-from-file-somehow)))])
11:07	TEttinger	matthavard: ##(char 0x92)
11:07	lazybot	⇒ \
11:07	TEttinger	matthavard: ##(char 0xa2)
11:07	lazybot	⇒ \¢
11:10	justin_smith	matthavard: if you convert the byte-array to string, and map int across the string
11:11	justin_smith	when you create the string, there is an optional encoding arg (with clojure it defaults to utf-8 which is almost always the right thing in my experience)
11:12	matthavard	That would not be the standard str function would it?
11:12	TEttinger	,(def some-bytes (byte-array (vec "hello")))
11:12	clojurebot	#error{:cause "java.lang.Character cannot be cast to java.lang.Number", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.ClassCastException: java.lang.Character cannot be cast to java.lang.Number, compiling:(NO_SOURCE_FILE:0:0)", :at [clojure.lang.Compiler$StaticMethodExpr eval "Compiler.java" 1696]} {:type java.lang.ClassCastException, :message "java.lang.Character cannot...
11:12	justin_smith	matthavard: String
11:12	justin_smith	,(get-bytes "hello")
11:12	clojurebot	#error{:cause "Unable to resolve symbol: get-bytes in this context", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.RuntimeException: Unable to resolve symbol: get-bytes in this context, compiling:(NO_SOURCE_PATH:0:0)", :at [clojure.lang.Compiler analyze "Compiler.java" 6535]} {:type java.lang.RuntimeException, :message "Unable to resolve symbol: get-bytes in this contex...
11:13	justin_smith	,(.getBytes "hello")
11:13	clojurebot	#object["[B" "[B@41e6be86"]
11:13	TEttinger	there we go
11:13	justin_smith	,(String. (.getBytes "hello"))
11:13	clojurebot	"hello"
11:13	TEttinger	,(String. (.getBytes "hello\u0092"))
11:13	clojurebot	"hello"
11:13	TEttinger	,(String. (.getBytes "hello\u00a2"))
11:13	clojurebot	"hello¢"
11:13	TEttinger	there we go
11:13	justin_smith	and you can map int on that
11:13	justin_smith	to get the int values of each char (not byte)
11:14	TEttinger	,(map int (String. (.getBytes "hello\u0092")))
11:14	clojurebot	(104 101 108 108 111 ...)
11:14	TEttinger	,(map int (String. (.getBytes "hey\u0092")))
11:14	clojurebot	(104 101 121 146)
11:14	justin_smith	and the circle is complete!
11:14	matthavard	So how do I get from file object to string?
11:15	justin_smith	matthavard: we just showed you how to get from byte-array to string
11:15	matthavard	oh oops
11:15	justin_smith	you can already get byte-array from a file
11:15	justin_smith	there is also slurp
11:15	justin_smith	that directly gives a string from a file
11:16	TEttinger	(doc slurp)
11:16	clojurebot	"([f & opts]); Opens a reader on f and reads all its contents, returning a string. See clojure.java.io/reader for a complete list of supported arguments."
11:16	TEttinger	the arguments can include an encoding
11:16	mbac	has some helpful fellow done the work of writing their own clojure photo gallery generator?
11:18	matthavard	justin_smith: So theoretically (map int (String. (to-byte-array (java.io.File. "foo.html")))) should work?
11:18	matthavard	and/or TEttinger
11:18	TEttinger	(map int (slurp "foo.html"))
11:18	justin_smith	matthavard: or (map int (slurp "foo.html"))
11:18	TEttinger	:D
11:19	justin_smith	heh
11:20	matthavard	And you were saying there's a way to set the encoding with that? Because that's giving me 65533 for bytes larger than 127
11:20	justin_smith	(slurp "foo.html" :encoding "something")
11:21	justin_smith	matthavard: supported encodings are http://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html
11:21	justin_smith	~supported encodings is http://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html
11:21	clojurebot	A nod, you know, is as good as a wink to a blind horse.
11:21	justin_smith	~supported encodings
11:21	clojurebot	supported encodings is http://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html
11:21	TEttinger	~supported
11:21	clojurebot	I don't understand.
11:32	film42424	I have a code style question.
11:34	film42424	I really want to add default vars to a record, but I want to be able to introspect those, so reify doesn't seem like a good option. I ended up with something like this: https://github.com/film42/rinok/blob/f5ea4c666be270e327c83582e07d2067ba05bc09/src/rinok/engine.clj#L63-L68
11:34	film42424	I'm sure the whole thing could be more idiomatic, so maybe there's a larger problem
11:34	film42424	Would love any kind of insight
11:35	justin_smith	film42424: the normal thing is to just create a function that manages your defaults, and not use the constructor directly
11:35	justin_smith	which looks like what you are doing
11:35	film42424	yeah, I just mocked it to look like a standard record constructor
11:36	justin_smith	well, you actually replaced the automatically generated constructor function
11:36	film42424	since won't actually take any args, I always know what to give it. Just seems awful to override the constructor
11:36	film42424	yeah
11:36	justin_smith	see also map->MatchingEngine
11:36	justin_smith	which is also automatically generated
11:38	film42424	Oh wow, I didn't know about map->MatchingEngine
11:41	silasdavis	hello clojure, I'm failing to bind the dynamic vars client-id and client-secret in https://github.com/mochify/hiroba/blob/master/src/mochify/hiroba/rest.clj
11:42	silasdavis	I think i've just forgotten how to clojure
11:42	silasdavis	I've set globar-vars in my project.clj
11:42	silasdavis	also used binding
11:42	silasdavis	i'm using fully-qualified name
11:42	silasdavis	how should I be setting these?
11:42	matthavard	TEttinger, justin_smith: Update, looks like any of the ISO8859_* encodings work!
11:43	TEttinger	woo!
11:43	matthavard	Just went down the list and tried them one by one haha
11:45	film42424	silasdavis: What happens if you actually set them in your shell?
11:47	film42424	Oh I guess that's not how environ works
11:55	mbac	luminus is pretty shiny
11:58	noncom\|2	mbac: true
11:58	Uruviel	https://github.com/funcool/buddy/issues/31
12:28	mbac	is the .html template format in luminus the same as the one in python django?
12:29	mbac	Selmer is a templating language similar to Django and Rails templates. If you're familiar with Django or similar templating languages you should feel right at home.
12:29	mbac	awesome!
12:29	mbac	this framework is filling me with entrepreneurial zeal
12:30	sobel	haha
12:30	sobel	that is hilarious/familiar
12:44	tomjack	I think Selmer's readme could use a "why?" section
12:47	justin_smith	tomjack: like why use Selmer when there's Integer/MAX_VALUE other options?
13:01	tomjack	well, I don't go in for those questions too much, I mostly look at the thing itself
13:02	tomjack	basically "why would I (Clojure programmer) want to use Django-inspired templates?"
13:03	justin_smith	tomjack: in my experience there is a very productive collaboration when you have a front-end person who knows html,css,js and a back end person who does clojure,devops and the selmer template is where the two meet
13:04	tomjack	yeah, I kind of imagined that's what it's meant for
13:04	justin_smith	so it needs to comprehensible and powerful for the frontend person to get their stuff done, while also providing access to what the backend can provide
13:04	justin_smith	*needs to be
13:04	tomjack	like "for when you're forced to use something like Django-inspired templates"
13:04	justin_smith	haha
13:05	justin_smith	more like, when the front end folks don't know any clojure, but sure
13:06	tomjack	but if the author would use these templates when writing an entire project on their own, I'd also like to hear why. but it's also fine to have a readme which assumes the reader already wants X, so doesn't explain why one might want X
13:08	_1_guddu	hy
13:09	_1_guddu	dm3
13:31	dwysocki	I'm having a problem that's probably just ignorance on my part
13:31	dwysocki	I'm using miner/tagged to save a record to a file in EDN format
13:31	dwysocki	When I parse it from the file, it properly resolves the type, with the fully-qualified namespace
13:31	dwysocki	but then the type is no longer considered equal its non-fully qualified form
13:31	dwysocki	so (= Foo my-ns/Foo) is false
13:31	dwysocki	I'm not really sure what to do at this point
13:32	dwysocki	it's causing my multimethods to fail to recognize the type
13:38	tomjack	that doesn't make sense to me
13:38	tomjack	either (identical? Foo my-ns/Foo) or not
13:38	tomjack	if not, why not?
13:38	tomjack	if not, you have two different Foo and it's getting the wrong one?
13:40	tomjack	actually..
13:40	tomjack	what is even my-ns/Foo
13:40	justin_smith	dwysocki: did you run defrecord twice?
13:40	justin_smith	reloading files that contain defrecord can lead to this sort of thing
13:40	justin_smith	if you have instances created with the prior defrecord before the reload
13:41	justin_smith	tomjack: because they mention a tagged reader I would assume a defrecord or maybe deftype
13:41	dwysocki	defrecord should only be run once
13:41	tomjack	defrecord doesn't define a var
13:41	tomjack	well, not that var
13:42	tomjack	if it's the class my-ns.Foo, then it should be the same class as Foo, or else the problem is that there are two Foo :)
13:42	dwysocki	I made a CLI that starts a separate instance of my program each time
13:43	dwysocki	so I can do `my-program write \| my-program read`
13:43	justin_smith	tomjack: the issue with re-running defrecord has nothing to do with vars. It's that you get two different classes with the same name.
13:43	tomjack	sure, I didn't expect it was a re-running defrecord issue
13:43	tomjack	just "(= Foo my-ns/Foo)" doesn't make sense
13:44	justin_smith	ahh, that is looking at a var
13:44	justin_smith	right
13:44	dwysocki	actually, it might be a re-running defrecord issue
13:44	dwysocki	I'm running my program from a jar
13:45	dwysocki	and it's spinning up twice
13:45	dwysocki	the first time writes something in EDN to stdout
13:45	dwysocki	the second time reads it from stdin
13:45	justin_smith	dwysocki: with defrecord my-ns/Foo shouldn't even get created (though my_ns.Foo should)
13:46	tomjack	it shouldn't matter.. I suggest taking a look at some instances which don't work with your defmethods, and comparing their classes to instances which do work.
13:46	dwysocki	it actually is my_ns.Foo, sorry
13:46	dwysocki	although
13:46	dwysocki	when it's written to stdout, it uses hyphens
13:46	dwysocki	oddly
13:47	dwysocki	but when it's read, they've been replaced with underscores
13:47	justin_smith	does the tagged literal with hyphens get reloaded properly?
13:47	dwysocki	it looks like it does
13:47	justin_smith	one thing you could test is whether a single instance can generate the string for the edn, and then read it and get the same result back
13:47	dwysocki	that's a good idea
13:48	justin_smith	eliminating variales yo
13:48	dwysocki	yup
13:51	tomjack	hmm
13:51	tomjack	hypothesis: you're getting miner.tagged/TaggedValue
13:52	tomjack	try it with a namespace that doesn't have hyphens :)
13:52	justin_smith	dwysocki: and if that works, next step is double checking that the reading side has loaded the ns that defines that record
13:52	dwysocki	no, i'm not getting miner.tagged/TaggedValue
13:52	dwysocki	that was my first thought
13:52	tomjack	ah, missed this: https://github.com/miner/tagged/blob/master/src/miner/tagged.clj#L87
13:52	dwysocki	I'm testing whether (= (class x) (class (parsed-x))) right now
13:53	dwysocki	oh fuq
13:53	dwysocki	it's not =
13:53	tomjack	too bad he has to munge classnames :(
13:54	dwysocki	I'm wondering now whether I should just write the map to a file, and assume it's always that type
13:54	tomjack	not =, but has the same name?
13:54	dwysocki	yeah, looks like the same name
13:55	justin_smith	dwysocki: that's weird
13:55	justin_smith	so (not= x (read-string (pr-str x)))
13:56	dwysocki	precisely
13:56	justin_smith	that's messed up
13:56	justin_smith	what about (= (read-string (pr-str x)) (read-string (pr-str (read-string (pr-str x)))))
13:56	tomjack	gotta be a defrecord-multiple-times error?
13:57	dwysocki	ooh, I'll try that one
13:57	justin_smith	if that's a yes, then yeah my initial hunch about multiple defrecord loads is probably it
13:58	justin_smith	if it's a no, that is maybe a defrecord bug?
13:58	dwysocki	it's false :\
13:58	dwysocki	unless I mistyped
13:58	justin_smith	sounds like a bug in either the printing or reading side of records...
13:58	justin_smith	weird!
13:59	dwysocki	or this library I put my trust in
13:59	tomjack	if you run (class (read-string (pr-str x))) over and over, do you get a different class every time?
13:59	justin_smith	tomjack: oooh, good call
13:59	tomjack	that would be nuts
13:59	tomjack	I can't imagine how..
13:59	dwysocki	maybe I'm just doing something stupid
14:00	dwysocki	wouldn't be the first time
14:00	dwysocki	nor the last
14:00	justin_smith	"programmer's program does not work, but only because they did something stupid, news at 11"
14:01	dwysocki	history in the making
14:03	dwysocki	huh
14:03	dwysocki	so when I encode it the second time and on
14:03	dwysocki	the type is miner.tagged.TaggedValue
14:03	dwysocki	but not the first
14:03	tomjack	miner/tagged has this lovely 'feature' that the record tags are handled by the default tag reader, and there is a global fallback
14:03	justin_smith	dwysocki: what's the repo for miner?
14:04	dwysocki	https://github.com/miner/tagged
14:04	tomjack	apparently there is some problem with the round-tripping of the record class/factory info for you
14:04	tomjack	so the record handlers fail and it defaults to TaggedValue, confusingly printed with the same (or almost the same?) tag?
14:05	justin_smith	dwysocki: and you are using the reader that miner provides?
14:05	dwysocki	yes
14:05	dwysocki	so
14:06	dwysocki	I override print-method on my record type to call (tag/pr-tagged-record on this w)
14:06	dwysocki	but if it's not seeing that the types are the same
14:06	dwysocki	it's going to default to the standard print-method
14:07	dwysocki	which prints the type as my_ns.Foo, instead of my_ns/Foo
14:07	dwysocki	and that's why the 2nd iteration and on are all of type TaggedValue
14:08	dwysocki	I think I've spent too long on this problem :P I should just give up and save a standard map
14:08	tomjack	I suspect the functionality there, which could have been easily added to Clojure core, wasn't added for a very good reason :)
14:08	dwysocki	and parse it into my record, which is almost trivial
14:08	dwysocki	this was supposed to be the easy part of what I did this weekend, lol
14:10	dwysocki	I think I'll actually just use the built-in edn reader, and inspect the tag
14:10	dwysocki	there are only 2 types I ever expect to see
14:11	justin_smith	dwysocki: a :type key added to a map should do it
14:12	dwysocki	yup
14:12	dwysocki	damned type systems
14:13	justin_smith	serialization is hard
14:13	dwysocki	I thought I'd finally found a case where a defrecord would be sensible
14:13	dwysocki	probably could have just added a :type key
14:13	justin_smith	my primary usage of defrecord has been in combination with protocols
14:14	dwysocki	I've just been using it with defmethods
14:14	dwysocki	that do slightly different things on my 2 types
14:14	justin_smith	it's easy to convert those to look at a :type tag
14:14	justin_smith	of course
14:14	dwysocki	yeah
14:14	dwysocki	I realize that now haha
14:15	dwysocki	ugh, I don't want to change all this code now
14:53	dwysocki	welp, I'm finally record-free
15:41	wagjo	,(clojure-version)
15:41	clojurebot	"1.7.0-master-SNAPSHOT"
16:18	Shayanjm	For anyone who's interested, here's the (spherical) haversine formula implemented in clj: https://gist.github.com/shayanjm/39418c8425c2a66d480f
16:19	the-kenny	Shayanjm: you might want to pull out some more stuff like (Math/sin (/ dlon 2)) into the let. There's also Math/exp
16:19	Shayanjm	the-kenny: Very good call
16:19	Shayanjm	one min, refactoring
16:20	dwysocki	also, newlines
16:20	Shayanjm	dwysocki: I don't ever know where to break lines in big mathy implementations :\
16:20	dwysocki	I would do it for the arguments to the initial +
16:21	dwysocki	so I don't have to scroll :P
16:22	dwysocki	and when I say "initial +", I guess I mean "the only +"
16:33	zirman	I've been trying to understand y combinator. I had a version that computed factorial that I reworked it into a different form. Is it still essentially a y combinator? Thanks.
16:33	zirman	function y(y) {
16:33	zirman	return function (n) {
16:33	zirman	return n === 0 ? 1 : n * y(y)(v)(n - 1);
16:33	zirman	}
16:33	zirman	}
16:33	zirman	y(y)(5);
16:34	zirman	oops
16:34	zirman	this is what I meant
16:34	zirman	function y(y) {
16:34	zirman	return function (n) {
16:34	zirman	return n === 0 ? 1 : n * y(y)(n - 1);
16:34	zirman	}
16:34	zirman	}
16:34	zirman	y(y)(5);
16:38	Frozenlock	zirman: refheap.com
16:38	oddcully	your javascript made dnolen timeout
16:39	zirman	sorry
16:39	dwysocki	haha, I've encountered yet another serialization issue
16:39	dwysocki	how do you serialize Double/NEGATIVE_INFINITY?
16:39	dwysocki	because it's getting output as -Infinity, and parsed as a symbol
16:40	zirman	https://www.refheap.com/99541
16:51	dwysocki	I suppose the -Infinity issue is taken care of in tools.reader
17:12	LaVidaPortland	zirman, that's some strange looking clojure. :)
17:12	sandbags	cfleming: ping ... don't suppose you're an Overtone user?
17:13	cfleming	sandbags: Pong... no, I'm not. I think I know the next question, though :)
17:13	TEttinger	sandbags, I'm curious about Overtone, does something in the livecoding break in Cursive?
17:13	TEttinger	I have only used at-at from Overtone, which is definitely nice
17:14	sandbags	cfleming: i just tweeted a screenshot of some code in cursive
17:14	sandbags	cfleming: it works but cursive seems unhappy
17:14	cfleming	TEttinger sandbags: It's not the live coding, it's the way the symbols are generated: https://github.com/cursiveclojure/cursive/issues/774
17:14	cfleming	sandbags: Yeah overtone makes Cursive sad
17:15	sandbags	so if i pull in overtone.core will that fix things?
17:15	sandbags	oh wait, i see, no
17:16	cfleming	sandbags: There's some hope that I might be able to fix that using stub generation, but that requires more time than I have right now.
17:16	cfleming	sandbags: However stub generation is also required for datomic to work nicely, so I'll do it at some point.
17:16	sandbags	okay so basically overtone is too-much-voodoo
17:16	sandbags	i mean, it's not a problem as is
17:16	cfleming	More or less, yeah
17:16	sandbags	it works
17:17	sandbags	oh one thing i could really use, is there a way to write a macro to send to the REPL?
17:17	cfleming	sandbags: Sure, you could just turn off the unresolved symbols warning.
17:17	sandbags	i wrote a macro but of course it's just inserting wherever the cursor has focus
17:17	cfleming	sandbags: https://github.com/cursiveclojure/cursive/issues/85
17:18	zirman	LaVidaPortland: not clojure but it has closures
17:18	cfleming	(which is a polite way of saying no)
17:18	sandbags	cfleming: yeah, awkward
17:19	cfleming	sandbags: You could fudge a macro if you assign a Cmd-number sequence to the REPL toolwindow - then you could start your macro with that key, which will jump to the REPL toolwindow.
17:19	sandbags	but in that don't you say that will close it if the REPL is already open?
17:19	cfleming	It'll close it if that toolwindow is already selected
17:20	cfleming	So if you're in a normal editor it will do what you want
17:20	sandbags	right, i think because i am switching back and forth that's likely to be annoying too often
17:21	cfleming	sandbags: Ok. I'll look into fixing that issue, it's been open for ages and it's a popular request.
17:21	sandbags	i'd hoped IDEA was a little more controllable
17:21	sandbags	but the macros look pretty rubbish
17:21	cfleming	sandbags: It'll be post-Clojure/West though.
17:21	nicferrier	could a lein project generate more than one main class?
17:21	nicferrier	if I just put gen-class in the ns decl does that make it a main?
17:21	sandbags	cfleming: would it be possible to script IDEA in Clojure(Script) using Cursive at some point?
17:22	sandbags	i mean it's Java...
17:22	cfleming	sandbags: Yeah, I'm planning that
17:22	sandbags	nice
17:23	sandbags	do you get any support from JetBrains... actually do you work for JetBrains? :)
17:24	cfleming	nicferrier: Sure - you can only have one per ns AFAIK, but you can have many namespaces with main functions, no problem. I think you can only specify one in project.clj to work with lein run, though
17:24	nicferrier	cfleming: right. thanks.
17:25	cfleming	sandbags: No, I don't, but they're fairly helpful. I have one mole there who helps a lot because he's a Clojure fan, and they're more helpful in general as Cursive gets more popular.
17:25	sandbags	so, labour of love
17:25	sandbags	impressive what you've done
17:26	sandbags	i was cautiously happy with LightTable but since i managed to get Cursive installed I've not looked back
17:26	cfleming	Well, you're going to have to pay for it at some point :)
17:26	sandbags	sure, sure, we all gotta eat :)
17:26	oddcully	cfleming: but it will be part of ultimate? like all the other languages?
17:26	sandbags	god knows what i've paid for this hobby over the years
17:27	cfleming	oddcully: Sadly, no - that would require some sort of deal with JetBrains. It's not out of the question, I suppose, but it's unlikely to be any time soon.
17:28	oddcully	ok, so all the other ones are actually done by JB i assume?
17:28	cfleming	Or are open source, right.
17:28	cfleming	But there are only a couple of decent open source ones - it's a huge amount of work.
17:28	sandbags	ye gods the overtone code is a bit complex ... i think i am goign to have to find my supercollider book to grok this stuff
17:29	oddcully	i only have python installed additional to the jvm ones. i guess that is from them (pycharm i guess)
17:31	cfleming	oddcully: Right, that's from them. The core Python support is actually open source now, but the framework and web support is not.
17:32	sandbags	Good opportunity for them to rewrite IDEA in Clojure :)
17:33	cfleming	sandbags: Ummmm.... that's unlikely to happen :-). They'll probably write more of it in Kotlin at some point I assume.
17:34	sandbags	Damned NIH :)
17:38	arrdem	are there any good composable regex DSLs for Clojure?
17:38	arrdem	I'm just realizing that I have a few productions that are repeated a _lot_
17:43	TEttinger	arrdem: that seems like... a very odd idea
17:43	arrdem	TEttinger: why?
17:43	TEttinger	regexes are already a dsl, and I have no idea how you would compose them
17:44	TEttinger	do you mean this-followed-by-this?
17:44	arrdem	yep, or this as a group in a new production
17:44	TEttinger	I wonder... #(str #"(\w+)\1\1")
17:45	TEttinger	I wonder... ##(str #"(\w+)\1\1")
17:45	lazybot	⇒ "(\\w+)\\1\\1"
17:45	TEttinger	hm
17:45	TEttinger	,(re-pattern (str #"(\w+)\1\1"))
17:45	clojurebot	#"(\w+)\1\1"
17:45	scottj	TEttinger: have you seen rx in emacs? https://github.com/clojure-emacs/clojure-mode/blob/master/clojure-mode.el#L966-L983
17:45	TEttinger	not an emacs user
17:45	TEttinger	cfleming is my lord and savior
17:46	TEttinger	woaah scottj that looks outrageously verbose
17:47	cfleming	arrdem: ztellman's automat, maybe?
17:47	TEttinger	that ztellman
17:47	TEttinger	always with the useful libs
17:47	cfleming	arrdem: or you could wrap a dsl around this: http://www.brics.dk/automaton/index.html
17:47	scottj	TEttinger: there are shorter names for a lot of the things. like instead of zero-or-one you can use optional or opt
17:47	TEttinger	ah ok
17:47	arrdem	cfleming: heh nice one
17:48	scottj	TEttinger: or one-or-more can be 1+
17:48	sveri	cfleming: sandbags I heard one of the kotlin developers talk last year about it. He said that more and more teams are switching to kotlin at JB. Most interesting fact for me was that the teams are free to choose their language they want to code in
17:49	sandbags	looks like YAOOPL
17:49	cfleming	sveri: Really? I'm surprised - basically all their code is in Java, except for the Scala and Kotlin plugins, which have a fair amount of their respective langs.
17:49	cfleming	sveri: And a lot of groovy in builds and tests
17:50	sveri	cfleming: He was coding in C# before he started working on kotlin, thats what he said
17:50	sveri	I guess there are a lot of teams doing different things beside Intellij
17:51	cfleming	sveri: Interesting - he was probably working on resharper, I guess, and I think they have some .NET profiling tools too
17:51	sveri	cfleming: Yea, could be, that sounds reasonable
17:52	cfleming	But yeah, they have a ton of products now.
17:52	sandbags	so complicated
17:52	sveri	sandbags: the java interop was pretty hard to understand the last time I looked at it, maybe one year ago
17:52	cfleming	sandbags: It's not so bad actually, takes a bit of getting used to, like anything I guess
17:53	cfleming	I'd use it for Android development, I think
17:53	cfleming	At least until arrdem finally finishes OxCart
17:53	sveri	:D
17:53	arrdem	cfleming: oxcart is dead. you may get oxlang evetually
17:54	sveri	cfleming: I tried that and gave up after some hours guessing how to integrate the java android api into kotlin code
17:54	cfleming	arrdem: I shall wait for it patiently.
17:54	arrdem	cfleming: just for that you're buying first at clj/w
17:54	cfleming	sveri: Oh, bummer. I'd say Java 8 but that's no good either.
17:54	cfleming	arrdem: Ok, ok....
17:54	sveri	cfleming: does not work ion Android yet IIRC
17:54	sveri	I mean Java 8
17:55	cfleming	sveri: Right, it doesn't.
17:56	sandbags	anyone here used JavaFX ... i've been looking at fn-fx but i can't tell if JavaFX is actually a useful thing to build on
17:57	cfleming	sandbags: tbaldridge seems to love it, I've never used it myself
17:57	sandbags	assuming tbaldridge is actually going to continue to work on fn-fx anyway (much like React for JavaFX)
17:57	cfleming	sveri: https://github.com/orfjackal/retrolambda should work for most of the interesting Java 8 stuff, that's nice.
17:57	sandbags	my last Java GUI experience was Swing in about 2001 so i'm kind of at sea
17:57	cfleming	sandbags: seesaw?
17:58	sandbags	i did take a look at that but... it didn't grab m
17:58	sandbags	e
17:59	sandbags	it's not like i remember anything useful about swing at this point anyway
17:59	sveri	cfleming: sounds interesting...but I guess I cannot use this at work as you need JDK 8 to compile the code and all our build systems must run JDK 7
17:59	oddcully	mine was AWT... i have the 1.1 oreilly book to prove it
17:59	oddcully	never finished it
18:00	cfleming	sveri: He recommends using JDK 8 for dev, but JDK 7 for builds/testing to make sure you catch any problems.
18:01	sveri	cfleming: "Use JDK 8 to compile your source code." that won't work for us I guess
18:03	sandbags	right, time for sleep ... thx again cfleming
18:04	Shayanjm	Ok now the opposite - "reverse haversine" implementation: https://gist.github.com/shayanjm/644d895c1fad80b49919
18:04	Shayanjm	any criticism is more than welcome -- still haven't fully figured out how to write thing in a clojuric way I think
18:07	cfleming	Shayanjm: That looks fine to me
18:08	cfleming	Shayanjm: One thing is that the official Clojure lib guidelines recommend not destructuring in your arglists - I actually quite like that though, since it appears in doc popups and so on, and documents the shape of the map you're expecting.
18:09	Shayanjm	cfleming: that was my reasoning for doing the destructuring
18:09	cfleming	Shayanjm: I think it's ok, I wouldn't worry about it
18:09	Shayanjm	Sweet thanks for the input :)
18:10	oddcully	and R should be some const (maybe for gist sake here dome otherwise)
18:10	oddcully	s/dome/done/
18:11	Shayanjm	good point cfleming
18:12	cfleming	Shayanjm: All credit for that goes to oddcully :)
18:12	Shayanjm	oops, oddcully *** tabbed the wrong name
18:17	oddcully	is there a way to import java stuff :as ? Like with all that Math/ stuff going on there to alias that to m/ ?
18:18	Shayanjm	oddcully: Yeah honestly I definitely should've done that
18:18	Shayanjm	I'll probably refactor with that in there once I finish testing @ scale
18:18	Shayanjm	it'll be part of the whole "tear down the duct tape" process prior to open sourcing
18:19	cfleming	oddcully Shayanjm: No, you can't do that - you need the class/method syntax
18:19	Shayanjm	cfleming: use as m wouldn't work?
18:20	cfleming	oddcully Shayanjm: The best you could do is wrap them in a function.
18:20	Shayanjm	orly
18:20	cfleming	Shayanjm: No, Math is a class, so you import it, not use it
18:20	Shayanjm	Ahh right
18:20	oddcully	ok, was just wondering, because searches/grimoire did not show anything
18:20	TEttinger	$google java 7 Math
18:20	lazybot	[Math (Java Platform SE 7 ) - Oracle Documentation] http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html
18:21	cfleming	Actually, Math you don't have to import because it's in java.lang, but if it were in another package you'd have to import it, and import has nothing like :as
18:21	oddcully	i only wanted to alias it ;)
18:21	TEttinger	,(def M Math)
18:21	TEttinger	curious
18:21	clojurebot	#'sandbox/M
18:21	oddcully	ok, is found nothing, because it does not exist
18:22	TEttinger	,(M/sqrt 4)
18:22	clojurebot	#error{:cause "No such namespace: M", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.RuntimeException: No such namespace: M, compiling:(NO_SOURCE_PATH:0:0)", :at [clojure.lang.Compiler analyze "Compiler.java" 6535]} {:type java.lang.RuntimeException, :message "No such namespace: M", :at [clojure.lang.Util runtimeException "Util.java" 221]}], :trace [[clojure.lang.Util ru...
18:22	TEttinger	,(.sqrt M 4)
18:22	clojurebot	#error{:cause "No matching method found: sqrt for class java.lang.Class", :via [{:type java.lang.IllegalArgumentException, :message "No matching method found: sqrt for class java.lang.Class", :at [clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 53]}], :trace [[clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 53] [clojure.lang.Reflector invokeInstanceMethod "Reflector.java"...
18:22	oddcully	TEttinger: this means no, right?
18:22	TEttinger	hm
18:23	oddcully	thanks anyway, bbl
18:23	oddcully	(inc cfleming)
18:23	lazybot	⇒ 15
18:23	oddcully	(inc TEttinger)
18:23	lazybot	⇒ 49
18:23	TEttinger	thx
18:24	cfleming	Ahh, sweet karma
18:24	TEttinger	,(def M #'Math)
18:24	clojurebot	#error{:cause "Expecting var, but Math is mapped to class java.lang.Math", :via [{:type clojure.lang.Compiler$CompilerException, :message "java.lang.RuntimeException: Expecting var, but Math is mapped to class java.lang.Math, compiling:(NO_SOURCE_PATH:0:0)", :at [clojure.lang.Compiler analyzeSeq "Compiler.java" 6732]} {:type java.lang.RuntimeException, :message "Expecting var, but Math is mapped t...
18:24	TEttinger	,(def M Math)
18:24	clojurebot	#'sandbox/M
18:24	TEttinger	,(.sqrt #'M 4)
18:24	clojurebot	#error{:cause "No matching method found: sqrt for class clojure.lang.Var", :via [{:type java.lang.IllegalArgumentException, :message "No matching method found: sqrt for class clojure.lang.Var", :at [clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 53]}], :trace [[clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 53] [clojure.lang.Reflector invokeInstanceMethod "Reflector.jav...
18:25	TEttinger	dog-at-keyboard.jpeg
18:25	cfleming	TEttinger: Can't do it, sorry
18:26	cfleming	I'd actually like to be able to do that, especially when you want to import two classes with the same name
18:39	arrdem	I guess I'd refactor that to use unit tagged values and define my own sin/cos/tan etc, but this is left as an exercise for another barber
18:39	arrdem	as-is it's fine tho
18:40	Shayanjm	thanks yo
18:58	ticking_	dnolen: hey, this looks liek abug in core.match, should I fill an issue? (match [[1 2 3]] [([h & r] :as a)] a) -> [1]
19:04	ticking_	additionally, does it grant its own issue, or should I just add it as a comment on http://dev.clojure.org/jira/browse/MATCH-93 ?
19:06	dnolen	ticking_: just add it to the ticket as additional case via comment, I believe sritchie may have found a similar issue w/ :as.
19:07	ticking_	dnolen: k, I'll do :)
19:07	dnolen	ticking_: no idea when I'll have time to look at though, so patch very welcome.
19:07	ticking_	dnolen: I'll look into it :)
19:07	dnolen	I've maxed out on Clojure OSS contribution
19:07	ticking_	dnolen: yeah, I was already wondering how you handled all that TBH
19:09	ticking_	dnolen: so thanks for all the good work :)
19:44	TEttinger	cfleming: I'm pretty proud of my first real macro
19:44	clojurebot	Excuse me?
19:44	TEttinger	also my first nested macro
19:45	TEttinger	,(defmacro import-alias [new-name imported] `(defmacro ~new-name [f# & body#] `(. ~'~imported ~f# ~@body#)))
19:45	clojurebot	#'sandbox/import-alias
19:45	TEttinger	,(import-alias mmm Math)
19:45	clojurebot	#'sandbox/mmm
19:45	TEttinger	,(mmm sqrt 4.0)
19:45	clojurebot	2.0
19:45	TEttinger	it doesn't use a / of course
19:46	TEttinger	(inc amalloy) ; for writing an excellent blog post on macros-in-macros
19:46	lazybot	⇒ 257
19:46	justin_smith	,(mmm PI) ; delicious
19:46	clojurebot	3.141592653589793
21:02	Shayanjm	6 hours and 8.4k requests later, my algo works and I now have a pretty comprehensive list of every restaurant in Austin TX ranked by popularity/foot-traffic :)
21:06	justin_smith	nice!
21:06	justin_smith	Shayanjm: is this just a data crunching thing, or do you have a frontend too?
21:07	Shayanjm	justin_smith: purely data crunching thing right now
21:07	Shayanjm	would be really cool to have a UI
21:07	Shayanjm	but I'd love to show off the implementation before it's super polished, since really it's a showcase of efficient hexagonal circle packing
21:07	justin_smith	Shayanjm: maybe incanter?
21:07	Shayanjm	justin_smith: Yeah I could do that - but at the scales i'm dealing with, just plotting is a HUGE issue
21:07	justin_smith	oh, nice, screenshot?
21:07	Shayanjm	sec i've got a few laying around
21:08	Shayanjm	justin_smith: http://puu.sh/gQUd9/3e76116348.png
21:09	Shayanjm	example at a reasonable scale
21:09	Shayanjm	i think the dimensions on that was something like 3km radius bounding 50m radius circles
21:09	justin_smith	looks like something that some opengl might help with - maybe cljs with 3.js or webgl?
21:10	Shayanjm	Yeah, tons of really cool stuff. Ideally i'd like to overlay on a map
21:10	Shayanjm	probably like a v2 thing tho
21:10	Shayanjm	what's really cool is that it can generate packings at even incredibly unreasonable scales
21:10	Shayanjm	http://puu.sh/gTuqz/dcd5406b74.png (in progress HUGE circle packing)
21:10	Shayanjm	something like 750k 5km circles being packed into a circle with radius 5M KM
21:11	justin_smith	so all these circles are identical in size, right?
21:11	Shayanjm	which, for reference, is bigger than the surface area of most planets in our solar system
21:11	Shayanjm	yeah
21:11	Shayanjm	one of the requirements for the implementation
21:11	Shayanjm	identical in size, no overlap
21:11	Shayanjm	this is specifically for API optimization
21:11	justin_smith	I bet there is some really good math for optimal packing of unit circles
21:11	Shayanjm	you want the minimum # of requests to some geo-bound API while still maximizing coverage
21:11	Shayanjm	justin_smith: yeah, circle packing is a still unsolved problem
21:11	justin_smith	ahh
21:12	Shayanjm	hexagonal packing is considered the most trivially optimal solution
21:12	justin_smith	http://mathworld.wolfram.com/CirclePacking.html
21:12	Shayanjm	but is by no means 'the' solution (as you can tell by the gaps)
21:12	justin_smith	yeah, that looks like what wolfram is saying too
21:12	Shayanjm	yeah, something like .906 average coverage
21:12	Shayanjm	unfortunately to get other packing configurations you pretty much have to brute force it
21:12	justin_smith	I didn't realize it was still an open thing, that's cool
21:12	Shayanjm	but for hexagonal packings specifically, I think I came up with a pretty clever implementation which is pretty fast
21:13	Shayanjm	30 seconds to generate 750k lat/long pairs on a macbook pro
21:13	Shayanjm	(to cover that bigger-than-a-planet area)
21:13	Shayanjm	so generating the points isn't even the bottleneck anymore - it's doing stuff with that data that takes forever.
21:14	Shayanjm	i'll be opening the project really soon so I would love any criticism at all
21:14	justin_smith	yeah, and then you have some questions to answer before you can get a fast solution - what kind of lookup should be optimized, neighbors vs. absolute position...
21:14	Shayanjm	Yeah exactly, there were a few ideas that I was throwing around
21:14	Shayanjm	with hexagonal packing the neighbors 'dumb way' is just generating 6 surrounding circle for each circle you generate
21:15	Shayanjm	which, obviously, would get hella computationally intensive as you have a bigger and bigger bounding area
21:15	justin_smith	eg. quad trees are amazing for fast lookup, but are kind of sad for traversing neighbors
21:15	Shayanjm	Yeah. the iterative solution was very very complicated
21:15	Shayanjm	and required tons of dynamic shit which just wasn't worth it
21:15	justin_smith	right
21:15	Shayanjm	so the implementation I settled with is fairly simple
21:16	Shayanjm	the gist is that you can split that hexagonal packing into 6 triangles
21:16	Shayanjm	if you figure out how to generate a triangle, you can just rotate those points 6 times
21:16	Shayanjm	which seems fairly obvious, but interestingly enough the triangle you have to generate resembles pascal's triangle
21:17	Shayanjm	each 'new number' in pascal's triangle (i.e: 1 _2_ 1) is a new distance from the center point that you have to manage if you were to generate the solution iteratively
21:17	Shayanjm	so as you generate more and more layers, you have to keep track of more and more distances from the center point, therefore you have an indefinite number of vars you have to keep track of iteratively
21:17	justin_smith	oh, of course
21:17	Shayanjm	instead, you can just generate the next-layer neighbors for each circle
21:18	Shayanjm	and take the set of those returned points
21:18	Shayanjm	because each distance to the next circle is only ever going to be 2 * circle's radius
21:18	justin_smith	Shayanjm: my hunch is that this sort of graph is not good for the standard graph algorithm optimizations (because it is so densely connected and uniform)
21:18	Shayanjm	and the bearing from each circle will only ever be 0 degrees or 60 degrees (each circle in the triangle has exactly 2 'next layer neighbors')
21:18	Shayanjm	yeah probably justin_smith
21:19	Shayanjm	i'm still trying to figure out if this is even a 'good' implementation
21:19	Shayanjm	it seems so, because the packing points are generated pretty damn fast
21:19	Shayanjm	and it mitigates the bottleneck to API rate limits
21:19	Shayanjm	in any case, i think it's a pretty cool project and hopefully someone can use it if they ever want to canvas huge areas using circle packing
21:20	Shayanjm	the lat/long coordinate generation is pretty accurate too - in line with the assumptions that most popular GIS APIs use (i.e: google maps)
21:21	justin_smith	Shayanjm: depending on what you are trying to do with the data, isn't there a variant / alternative to packing where instead of ensuring no overlaps, you ensure no uncovered area and minimize total count given that constraint?
21:21	justin_smith	Shayanjm: I ask this not really fully comprehending what you are doing
21:22	Shayanjm	justin_smith: yeah, that's theoretically "the seed of life"
21:22	Shayanjm	I think
21:22	Shayanjm	the packing would end up looking something like this: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSaSaPEOU1riyviI1pSqLqPlC6Ed6wK50jjXW01jftN7ngvz7nfF1GNrA
21:22	justin_smith	oh, interesting
21:22	Shayanjm	justin_smith: the usecase is this: imagine you wanted to get data on every business in your city. Or even bigger - every business in your state
21:23	justin_smith	Shayanjm: isn't that cetner circle redundant there?
21:23	Shayanjm	unfortunately if you just ask google: "Get me every business in 5km from my point" it'd only return at most like 20 results, because it limits the return despite having a huge upper bounding radius
21:23	justin_smith	ahh, OK
21:24	Shayanjm	justin_smith: Nah that's why it's called the "seed of life". It's a pattern that occurs naturally where you have a single entity, put 6 points around it separated by 60 degrees each
21:24	Shayanjm	and draw circles with centers at those points
21:24	Shayanjm	and it overlaps 100%
21:24	Shayanjm	if you removed the center circle, you'd end up with my pattern
21:24	justin_smith	and if you shrink all the circles, you get a standard hex packing, right?
21:24	Shayanjm	Yup
21:24	justin_smith	cool
21:25	Shayanjm	even more interesting: if you make each circle so small it becomes a point
21:25	Shayanjm	you can get the trivially-optimal electron coverage for a sphere
21:25	Shayanjm	of some given radius
21:25	justin_smith	Shayanjm: I just got a job doing some graph / big data stuff, so I'm finding it useful to exercise some semi-related brain muscles
21:25	Shayanjm	Yeah, I work in financial tech so I love working on projects like this
21:25	Shayanjm	before Fintech, I was in Health IT doing predictive modeling for patient outcomes
21:26	Shayanjm	so weird off-the-wall data projects are my bread and butter
21:26	justin_smith	cool - I love this kind of stuff because what "normal people" find "intuitive" is so much less a factor
21:26	justin_smith	haha
21:27	Shayanjm	hahahaha yup
21:27	Shayanjm	@ day job I have to write pretty dumb code so everyone else can quickly understand & get up to speed
21:27	justin_smith	"we know that's how it really works, but we don't understand it, so can you present us with something totally inaccurate that we understand?"
21:27	Shayanjm	on these types of projects, I can sit and think about a problem for 3 hours and implement like 2 (dense, but clever) lines
21:27	Shayanjm	lolol yup precisely
21:27	justin_smith	"oh, and we are going to complain if it's ever wrong, even though we asked for a thing that is wrong"
21:27	Shayanjm	hahahahaha exact same tension w/ me @ work
21:28	Shayanjm	I tend to want to optimize for the general solution that will _always_ work
21:28	Shayanjm	it describes the problem accurately, and delivers a solution in a format that is true to the problem domain
21:28	Shayanjm	but then I end up having to rewrite it in a dumb breakable way because no one can quickly read it and fully grok it
21:29	Shayanjm	justin_smith: I'll be writing a blog post outlining what I did in this project, but I think I'm going to take it in a different direction
21:30	Shayanjm	instead of going over the technicalities of the project, I think I'm going to write something along the lines of: "How to take an idea from Point A to Point B when the bottleneck is a lack of domain knowledge"
21:30	Shayanjm	and using this specific project as an example/springboard
22:24	fellipebrito	Do you guys use cljs for something? If yes, how do you guys test it? I've found clojure pretty good at tests, but cljs makes me a little confuse.
22:25	LaVidaPortland	I'm just starting to learn clojure, so I haven't done anything with cljs yet. Sorry!
23:43	Bruce_Wayne	anyone know the best library when dealing with passing params in a url?
23:43	justin_smith	Bruce_Wayne: use ring wrap-params
23:44	Bruce_Wayne	having trouble with params that have a &
23:44	Bruce_Wayne	won’t pass in the url
23:44	justin_smith	can you give an example?
23:44	Bruce_Wayne	Wagner & Sons
23:44	XorSwap	Batman?
23:44	Bruce_Wayne	a string such as that is a paramater I need to pass in the url
23:44	justin_smith	yeah, that's not a valid syntax in a URL param, you need to escape it
23:44	Bruce_Wayne	but it won’t accept the & symbol
23:45	justin_smith	that's a limitation of how URL parameters work
23:45	Bruce_Wayne	justin_smith: exactly, so how can I escape it?
23:45	arrdem	justin_smith: cemerick and some other people have lighter weight url parsing and forging libraries
23:45	justin_smith	oh, for generating such a thing? there's a library that does URL encoding, sorry
23:45	Bruce_Wayne	yep!
23:45	Bruce_Wayne	what’s the library?
23:46	justin_smith	arrdem: lighter weight than wrap-params?
23:46	justin_smith	Bruce_Wayne: checking
23:46	Bruce_Wayne	thank you!
23:46	arrdem	justin_smith: isn't that part of ring's routing infra?
23:46	justin_smith	it's a middleware, I thought he was serving requests
23:46	arrdem	justin_smith: when doing the lib-grim url crap I found a few things that were _just_ url parsing/generating
23:46	arrdem	maybe he is
23:46	arrdem	Bruce_Wayne: the hell are you doing so we can arm you accordingly
23:47	arrdem	don't want to give you bad advice now do we :P
23:47	Bruce_Wayne	I am passing params through a url, then populating a form with those params on the other end
23:47	Bruce_Wayne	so I need to take the param
23:47	Bruce_Wayne	encode it for the url
23:48	Bruce_Wayne	then decode it back to the original to prepopulate the form
23:48	justin_smith	Bruce_Wayne: with jvm 1.7+ use (URLencoder/encode str "UTF-8")
23:48	justin_smith	for 1.6 I'm not sure
23:48	Bruce_Wayne	ok, and how can I decode the params on the other end?
23:49	justin_smith	wrap-params does it if you have a ring server on the other end
23:49	arrdem	justin_smith: aw come on man [cemerick/url "RELEASE"]
23:49	justin_smith	arrdem: it's a single static method, you don't need a lib for that
23:49	arrdem	justin_smith: the lib is literally defn wrappers around that single static method lol
23:50	justin_smith	anotehr static method to decode (URLDecoder/decode str "UTF-8")
23:50	justin_smith	Bruce_Wayne: as long as you can use 1.7, use those two, I'd say
23:51	Bruce_Wayne	justin_smith: Thank you
23:52	justin_smith	haha