#clojure – 2015-08-18

2015-08-18

00:00	sdegutis	The connection is stored in a simple var, so basically yeah.
00:02	rhg135	,(do (def a 1) (alter-var-root #'a inc) a)
00:02	clojurebot	2
00:02	sdegutis	justin_smith: back
00:03	justin_smith	sdegutis: rhg135 has a good point, you could just use alter-var-root or def
00:03	Bronsa	ew
00:04	rhg135	I never said it was a good idea
00:04	sdegutis	Won't that be slower?
00:04	rhg135	just that it existed
00:04	sdegutis	Also Compojure, thus threads.
00:04	rhg135	exactly
00:05	rhg135	,(meta ns)
00:05	clojurebot	nil
00:05	justin_smith	,(meta (the-ns ns))
00:05	clojurebot	nil
00:05	Bronsa	,ns
00:05	clojurebot	#object[clojure.lang.Namespace 0x62eb0ba1 "sandbox"]
00:05	justin_smith	,(meta #'meta)
00:05	clojurebot	{:arglists ([obj]), :doc "Returns the metadata of obj, returns nil if there is no metadata.", :added "1.0", :static true, :line 202, ...}
00:06	rhg135	,(alter-meta! ns assoc ::store-stuff-here-and confuse-people)
00:06	clojurebot	#error {\n :cause "Unable to resolve symbol: confuse-people in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: confuse-people 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 sym...
00:06	rhg135	,(alter-meta! ns assoc ::store-stuff-here-and-confuse-people)
00:06	clojurebot	#error {\n :cause "Wrong number of args (2) passed to: core/assoc--4130"\n :via\n [{:type clojure.lang.ArityException\n :message "Wrong number of args (2) passed to: core/assoc--4130"\n :at [clojure.lang.AFn throwArity "AFn.java" 429]}]\n :trace\n [[clojure.lang.AFn throwArity "AFn.java" 429]\n [clojure.lang.RestFn invoke "RestFn.java" 427]\n [clojure.lang.AFn applyToHelper "AFn.java" 156]\n...
00:06	justin_smith	rhg135: assoc needs two values
00:06	rhg135	eh, I probably shouldn't be writing code
00:06	justin_smith	and they both need to be things that exist...
00:06	rhg135	,(alter-meta! ns assoc ::store-stuff-here-and-confuse-people true)
00:06	clojurebot	{:sandbox/store-stuff-here-and-confuse-people true}
00:07	justin_smith	rhg135: heh, I know that feel, I had a large helping of whiskey before leaving work
00:07	justin_smith	hit a major milestone and had to celebrate
00:07	rhg135	sad thing is, i'm sober
00:07	justin_smith	finally moved the major foundation of our app into onyx for distributed computation - it's like "hey app, welcome to the 21st century"
00:08	justin_smith	onyx is cool
00:08	rhg135	I'm just going to update my lazybot fork. that way when I mess up other people can debug for me
00:08	justin_smith	(inc mdrogalis)
00:08	lazybot	⇒ 9
00:08	rhg135	via IRC
00:09	justin_smith	I did a bunch of lazybot hacking earlier this year
00:09	justin_smith	but did not fix the one thing that actually needed fixing, somehow
00:09	rhg135	I a few years ago
00:09	rhg135	I was meaning to excise mongo, but lazy
00:10	rhg135	I'd have to rewrite half the plugins
00:10	Bronsa	justin_smith: the connection issues?
00:10	justin_smith	you should totally hook in a dotomic based karma system
00:10	justin_smith	Bronsa: yeah
00:10	rhg135	I wanted to
00:10	justin_smith	Bronsa: the way it will think it is connected and really be in a void connected to nobody/nothing
00:10	rhg135	instead I will finish my text generator plugin
00:10	Bronsa	just immagine how sad and lonely it must feel
00:11	rhg135	you can call, but nobody replies
00:11	justin_smith	Bronsa: lazybot bugs are how I truly feel inside :(
00:12	justin_smith	anyway, yeah, never did find a fix for that issue
00:12	rhg135	my workaround was ping me until I get off my a** and restart it
00:13	rhg135	eventually I just took it offline
00:14	crocket	Why does it take a lot longer to start an uberjar than to start a single script via clojure.jar?
00:14	rhg135	justin_smith: actually, that datomic idea isn't bad. It'd reminded me I could leave in mongo and move stuff to datomic in time
00:15	rhg135	no clue
00:28	Seylerius	,(defn fibber [n] (take n (map first (iterate (fn [[a b]] [b (a + b)]) [0 1]))))
00:28	clojurebot	#'sandbox/fibber
00:28	Seylerius	,(fibber 6)
00:28	clojurebot	#<ClassCastException java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IFn>
00:29	Seylerius	Oi.
00:29	Seylerius	I really made that mistake?
00:29	Seylerius	,(defn fibber [n] (take n (map first (iterate (fn [[a b]] [b
00:29	Seylerius	(+ a b)]) [0 1]))))
00:29	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
00:30	Seylerius	,(defn fibber [n] (take n (map first (iterate (fn [[a b]] [b (+ a b)]) [0 1]))))
00:30	clojurebot	#'sandbox/fibber
00:30	Seylerius	,(fibber 6)
00:30	clojurebot	(0 1 1 2 3 ...)
00:30	Seylerius	,(defn fibber [n] (take n (map first (iterate (fn [[a b]] [b (+ a b)]) [1 1]))))
00:30	clojurebot	#'sandbox/fibber
00:31	Seylerius	,(fibber 6)
00:31	clojurebot	(1 1 2 3 5 ...)
00:31	Seylerius	There we go.
00:32	crocket	Hell
00:35	crocket	If I compiled a clojure library for java users, is it tied to a specific clojure version?
00:35	Seylerius	crocket: Pretty sure it compiles the clojure it needs into the jar, so yes.
00:37	crocket	Ewww
00:37	crocket	It's going to become large
00:38	Seylerius	crocket: If you're compiling for use by non-clojurists, expect to have to carry around some deps.
00:44	rhg135	clojure isn't that large anyway
00:45	sdegutis	So, swapping out a value for another value inside insert-into-database and update-entity don't sound like terrible ideas performance-wise?
00:46	crocket	Clojure 1.7.0 3.8MB
00:47	rhg135	that's relatively small
01:53	Olajyd	Hi, justin_smith
01:57	Olajyd	Hi, TEttinger :)
02:00	Olajyd	Tettinger, I want to implement a perl regex pattern in clojure, is this possible?
02:00	TEttinger	probably, perl uses a subtly different regex engine, but it's mostly compatible
02:00	TEttinger	what is it in perl?
02:01	TEttinger	also, http://www.regular-expressions.info/tutorial.html is an amazing resource
02:04	TEttinger	Olajyd: there's some further confusion possible because perl 6 (which is kinda in alpha or beta or some prerelease state) potentially can use really really crazy regexes.
02:04	Olajyd	TEttinger, I tried the following: given a perl regex : s/^[PH]*// for the string “hPPHp123hp” i figured a way of doing it in clojur as (clojure.string/replace “hPPHp123hp” (re-pattern “[Pp]\|[Hh]”)) :=> “123”
02:06	TEttinger	do you want it to ignore case?
02:06	Olajyd	Tettinger, yes sure
02:06	TEttinger	,(clojure.string/replace "hPPHp123hp" #"^[PpHh]*" "")
02:06	clojurebot	"123hp"
02:06	TEttinger	if you want it to remove all h and p
02:06	TEttinger	,(clojure.string/replace "hPPHp123hp" #"[PpHh]" "")
02:06	clojurebot	"123"
02:06	Olajyd	oh great
02:07	Olajyd	another use case that seems to confuse me is to replace any possible occurrence with the string “000”
02:09	TEttinger	so in regexes, which are pretty much their own language, not related to clojure at all (and clojure's regexes are the same as java's), the character ^ means start of string usually. square brackets with some characters inside mean any of those characters will match, once. ^ inside square brackets means anything that ISN'T the characters after ^ in the brackets will match
02:09	Olajyd	so say (clojure.string/replace "hPPHp123hp" #"[PpHh]" “000”) I need it to return ;=> “000123000”
02:09	TEttinger	* means repetition, 0 or more
02:09	Olajyd	ok
02:09	TEttinger	+ means repetition, 1 or more
02:09	TEttinger	ah ok
02:10	TEttinger	,(clojure.string/replace "hPPHp123hp" #"[PpHh]+" "000")
02:10	clojurebot	"000123000"
02:10	Olajyd	Great
02:10	Olajyd	Thanks,
02:11	Olajyd	Will go over the resource you just shared
02:11	Olajyd	I owe u another drink.. :)
02:11	TEttinger	no prob! regexes are something that I wish they taught whole classes on in colleges, they are extremely useful even to non-programmers (some text editors and even word processors allow regex find/replace, huge timesaver)
02:13	Olajyd	hmm, thanks
02:17	TEttinger	some of the better tricks with regexes cover stuff that's very difficult with character-by-character processing of a string. within a regex (not a normal string), \b can be very very handy to find word boundaries, and \p{Lu} will find all upper case letters, even ones that aren't in English
02:17	MasseR	\p? Shouldn't it be \w?
02:18	MasseR	Or maybe even, what's the difference between them
02:18	TEttinger	MasseR: \w I believe is the same as [A-Za-z0-9_]
02:19	MasseR	TEttinger: Hmm.. alphanumeric yes, but outside of ascii range
02:19	MasseR	grep -E "\w+" --color=always seems to match for both foo0 and föö0
02:19	TEttinger	&(let [latin1 (apply str (range 32 255))] (apply str (re-seq "\w")))
02:19	lazybot	java.lang.RuntimeException: Unsupported escape character: \w
02:19	TEttinger	&(let [latin1 (apply str (range 32 255))] (apply str (re-seq #"\w" latin1)))
02:20	lazybot	⇒ "3233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142... https://www.refheap.com/108397
02:20	TEttinger	oh stupid me
02:20	MasseR	:)
02:20	TEttinger	&(let [latin1 (apply str (map char (range 32 255)))] (apply str (re-seq #"\w" latin1)))
02:20	lazybot	⇒ "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
02:20	TEttinger	yep, ascii only for \w in java
02:20	TEttinger	&(let [latin1 (apply str (map char (range 32 255)))] (apply str (re-seq #"\p{Lu}" latin1)))
02:20	lazybot	⇒ "ABCDEFGHIJKLMNOPQRSTUVWXYZÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ"
02:20	TEttinger	&(let [latin1 (apply str (map char (range 32 255)))] (apply str (re-seq #"\p{L}" latin1)))
02:20	lazybot	⇒ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzªµºÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ"
02:21	TEttinger	&(let [latin1 (apply str (map char (range 32 255)))] (apply str (re-seq #"\p{Ll}" latin1)))
02:21	lazybot	⇒ "abcdefghijklmnopqrstuvwxyzªµºßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ"
02:21	MasseR	grep -E doesn't seem to match anything with \p. I like regex, but too many variations of it :/
02:22	TEttinger	yeah. \p takes a unicode category code after it in curly bracees
02:22	TEttinger	L is letters, Lu is upper case letters, Ll is lower case letters
02:22	TEttinger	not all regex engines implement it, and they all do different unicode versions.
02:23	TEttinger	java 9 will support unicode 7.0 sometime next year
02:23	TEttinger	perl 6 (on one of the VMs it can run on) supports Unicode 8.0
02:23	TEttinger	perl 6 also has some really really weird and useful extensions
02:24	TEttinger	IIRC, \c[APOSTROPHE] is another way of matching the ' character, and it's especially useful when your editor thinks any ' is a string starting
02:25	TEttinger	\c[SIGN OF THE HORNS] is the metal fingers gesture introduced as an emoji in unicode 8
03:09	varnie	good day.
03:11	varnie	I have a question about reduce. suppose I have a function which recursively traverses directory, finds specific files and calculates, the count of lines in them. this function returns total count of lines in files. My question is - wouldn't (reduce + ...) produce a lot of "thunks" and, thus, gobble up a lot of memory?
03:13	varnie	I can show my code snippet to clarify what I mean.
03:30	luxbock	gfredericks: sorry if you my question earlier was unclear, I'll try to describe my use case
03:31	luxbock	my program deals with trees that are "drawn" from rules and a root-node
03:31	luxbock	and I'd like to use test.check to test properties of the trees
03:32	luxbock	so to generate them, I need two generators, one for the rules and one for the root-nodes
03:33	luxbock	however these trees can grow quite large depending on the rules and the root-node
03:33	justin_smith	varnie: reduce doesn't need to build thunks, because all it needs is the accumulator
03:33	justin_smith	varnie: and in the case of reduce + the accumulator takes up very little RAM
03:34	justin_smith	varnie: nothing is executed out of order, so there are no thunks to keep around
03:34	varnie	justin_smith, I want to understand what happens when the depth of execution is big enough.
03:34	justin_smith	varnie: reduce doesnt do "deep"
03:35	justin_smith	varnie: at each step, the execution so far is cleaned up and replaced by the accumulator
03:35	varnie	we enter the directory which contains N subdirectories, in order to perform outermost reduce + we need to traverse all of them and calculate their output "result value".
03:35	luxbock	so in order for my tests to fail early, I'd like to generate the properties of the rules and the root-nodes so that they result in smaller trees at the beginning, and then grow larger and larger
03:35	luxbock	i.e. that's what I meant with shrinking
03:36	varnie	and only when we have a list of result values, say (100, 200, 0, 20, etc), the outermost reduce + will fire. or am I wrong?
03:36	justin_smith	varnie: there is never a list of results
03:36	justin_smith	varnie: + is applied at every step
03:36	varnie	justin_smith, can you have a look at my code?
03:36	justin_smith	varnie: it's late and I'm just having a bit of insomnia but I'll give it a try
03:37	luxbock	this would be really easy to do if I can define a generator that chooses elements from a collection, choosing the earlier elements more frequently at the beginning
03:37	varnie	justin_smith, thank you. one moment please...
03:37	luxbock	does `gen/one-of` already do that?
03:37	justin_smith	varnie: but reduce does not hold onto the individual results before applying its accumulation - it's appled and the input is forgotten at every step
03:37	varnie	justin_smith, here it is: http://pastebin.com/Nja2D7xe
03:38	varnie	justin_smith, as you already know, I am a newbie, so... ;)
03:39	justin_smith	varnie: at line 14 the "reduce +
03:39	justin_smith	sorry
03:39	justin_smith	at line 14, the reduce + realizes one item of your map at a time
03:40	justin_smith	the map returns a number and all other information from that call realizing that item is thrown away
03:40	varnie	okay. can you say, what are the drawbacks of my approach? what could be done better in other words?
03:40	justin_smith	the number is added to the total you have so far, and the previous total is thrown away
03:40	varnie	I see.
03:41	justin_smith	varnie: I think it's easy to be confused by "reduce +" because + can take more than two args, and in that case it calls reduce
03:41	justin_smith	varnie: but when you use "reduce +" you only call + with two args each time
03:42	varnie	will it be better to rewrite it using loop/recur and accumulating an atom value during each step?
03:43	justin_smith	,(reduce (fn [acc i] (print "element " i " ") (+ i acc)) 0 [1 2 3 4 5])
03:43	clojurebot	element 1 element 2 element 3 element 4 element 5 15
03:43	justin_smith	varnie: does the above help?
03:43	varnie	I know what it does. you mean that I might rewrite my program in that way?
03:44	justin_smith	varnie: regarding loop + atom, absolutely not. First off you don't need loop for this, second off if you are using a loop you don't need an atom - you would just pass the updated value to recur
03:44	justin_smith	varnie: I was just demonstrating that at each call reduce gives two numbers to +
03:44	justin_smith	varnie: and all previous steps are gone
03:44	varnie	ah, that's right.
03:46	justin_smith	varnie: and just a couple of style things - you can use import and that way you don't need to type out the full package to use a method
03:47	varnie	justin_smith, yes, but as for "org.apache. ...." it doesn't work from "lein repl" if I do "(load-file my-app.clj"). (currently I don't have a project for it)
03:47	justin_smith	and you might want to reduce your repetition by binding something like "file-object (io/file file)" in the let block
03:47	justin_smith	varnie: sure, but import doesn't change this at all
03:48	justin_smith	varnie: you need to set up your classpath, whether you use import is orthogonal to that
03:48	varnie	justin_smith, I'll check it out.
03:48	justin_smith	varnie: you'll find that in clojure not having a project is the hard way to do things, as soon as you have deps
03:49	varnie	haha, correct
03:49	varnie	I decided to start from something simple, but it turned out it is not that simple.
03:49	varnie	having a project would be way better.
03:50	justin_smith	varnie: yeah, the simple thing is to define a project (unless you know classpath building like the back of your hand)
03:50	varnie	justin_smith, what are the other ways to rewrite my program?
03:52	justin_smith	varnie: on line 24, where you look at "last s" this is O(n), here I am sure this does not matter because it's not like you'll have paths thousands of letters long, but since a string is counted it is much faster to use .charAt based on the count
03:52	justin_smith	which is O(1) rather than O(n)
03:53	justin_smith	varnie: in general, be suspicious of "last" unless the argument is a lazy sequence (in which case O(n) is your best / only option)
03:53	varnie	I see. but this function execute 1 times only.
03:53	varnie	in my current program, I mean.
03:53	justin_smith	yeah, like I said, it likely does not matter here
03:53	justin_smith	since the strings are probably very short too
03:53	justin_smith	just something to note in general, last is usually not the right thing for anything counted
03:54	justin_smith	,(counted? "hello")
03:54	clojurebot	false
03:54	justin_smith	oh wait, I should have remembered that bit of silliness
03:54	justin_smith	anyway, a string is effectively counted, heh
03:54	varnie	counted? : ""Returns true if coll implements count in constant time""
03:54	justin_smith	right
03:54	justin_smith	in other words we know the count without counting the items by hand
03:55	justin_smith	which means we can probably look up an item without going through them one by one
03:55	varnie	yup, I got it.
03:57	justin_smith	varnie: also, "remove-last-slash" is not needed - you might like it for aesthetic reasons, but /usr/foo/////bar is a valid path, and is equal to /usr/foo/bar
03:57	justin_smith	unless commons.io is applying restrictions beyond that of the system
03:59	justin_smith	,(require '[clojure.java.io :as io])
03:59	clojurebot	nil
03:59	justin_smith	,(io/file "/////user//////bin///////////ls")
03:59	clojurebot	#object[java.io.File 0x573cf76b "/user/bin/ls"]
04:00	varnie	okay. I agree.
04:02	justin_smith	varnie: otherwise, modulo camelCase naming (we usually do kebab-case instead), looks fine
04:02	justin_smith	one pragmatic reason for kebab-case for clojure bindings, is that if we see camelCase we know it's a method of some Object we are using
04:03	justin_smith	makes code easier to read
04:03	varnie	one more question - here I used "isString" which is "(string? path)". I use it to be sure that "(.is Directory (io/file path))" doesn't throw an exception.
04:03	varnie	I wonder what is a proper way of handling wrong input? say, I execute (count-lines "php", 123)
04:04	varnie	where 123 is "path"
04:04	justin_smith	you already have a :pre block
04:04	varnie	yes, that too. but is it ok?
04:04	justin_smith	{:pre [(not (clojure.string/blank? extension)) (string? path)]}
04:05	justin_smith	you can have as many conditions as you like in there, and since the code doesn't work if path is not a string, you may as well make it a pre-condition
04:06	justin_smith	just remember that pre-conditions are assertions, and like all other assertions can be turned off at runtime, so use them to detect programmer errors and not exceptional runtime conditions
04:06	varnie	so, I remove my (let [isString ....]) and leave only pre-condition
04:07	varnie	one more pointer - I suspect that my count-lines-in-file function might throw some exception if the passed file couldn't be open.
04:08	justin_smith	varnie: yeah - whether you want to leave that as an exception for the caller (they asked for information that couldn't be given) or just return 0 for files you can't open via a try/catch is up to you
04:09	varnie	and, possibly, not only this particular exception ;)
04:09	justin_smith	sure, you could even try/catch/throw if you want a more specific error in that case
04:13	varnie	justin_smith, thanks for your help
04:13	justin_smith	np, glad I could be of assistance
04:14	TEttinger	(inc justin_smith)
04:14	lazybot	⇒ 284
04:14	justin_smith	(identity amalloy)
04:14	lazybot	amalloy has karma 293.
04:16	luxbock	when I implement a protocol from another namespace, am I supposed to use the of the class or the var of the protocol in the spec declaration?
04:18	justin_smith	(ns foo (:require [bar.baz :as baz])) (defrecord quux [] baz/SomeProto ...)
04:18	justin_smith	so really as neither
04:18	justin_smith	as the protocol :)
04:19	justin_smith	but yeah, expect it to be resolved the same way any symbol pointing to a var would
04:20	luxbock	alright, I'm having some issues with defining the protocol as a schema, to avoid the issue of circular namespace definitions, if you still remember me asking about that earlier
04:21	luxbock	so trying to track that down
04:21	justin_smith	oh, yeah. I'm not as familiar with using protocols in schemas (but I'd expect it would work...)
04:21	luxbock	it works, sometimes, which is why this is so annoying
04:24	justin_smith	luxbock: what about defining a schema for the protocol, that validates whether the item implements said protocol? https://github.com/Prismatic/schema/wiki/Defining-New-Schema-Types
04:25	luxbock	justin_smith: thanks for the idea, I said schema but I'm actually using https://github.com/roomkey/annotate which is very similar
04:25	luxbock	but I said schema since I figured more people would know of it
04:25	justin_smith	oh - well at that point I'm even less helpful
04:26	luxbock	fwiw I think your suggestion is how annotate attempts to use it
04:26	luxbock	I'm guessing the issue is related to the order in which the namespaces are loaded
04:27	justin_smith	luxbock: also, looks like the trick with annotate would be to make a "type" for your protocol, that extends Typeable, and returns true if the arg implements said protocol?
04:27	luxbock	all of my other namespaces use my schemas namespace, so it gets required there, but my test namespaces don't
04:27	justin_smith	http://roomkey.github.io/annotate/annotate.core.html#var-Typeable
04:29	justin_smith	luxbock: or it looks like you could use (Pred (partial satisfies? MyProto))
04:29	luxbock	justin_smith: I think annotate already does that for me
04:29	luxbock	like I said, it works sometimes :)
04:30	justin_smith	luxbock: OK, I made that suggestion based on the fact that their documentation made no mention of supporting protocols
04:31	justin_smith	but if it only sometimes works automatically, it couldn't hurt to try doing it by hand, no?
04:32	luxbock	yeah, I'll give that a try next, I'm currently investigating if requiring my schemas-namespace in my generators namespace would do the trick
04:37	luxbock	yeah the problem is that for some reason the records that I define are not implementing the protocol
04:39	luxbock	but they do so when I define them in the namespace where the record-type is defined
05:15	fdija	Hi! Is it possible to start a NREPL session from lein run? I want to start my app in a terminal, have it init it's UI there, and then connect my editor (emacs) to it with nrepl (Cider). Is that possible?
05:16	phillord	"lein repl :headless" ?
05:17	phillord	or you can launch nrepl from within the application. I do that here...https://github.com/phillord/protege-nrepl
05:18	phillord	but in this case, it's because I couldn't work out how to launch the application in any other way
05:18	schmir	fdija: and then M-X cider-connect
05:19	phillord	or you could launch the nrepl in the normal way with leiningen, then launch the application directly either by calling it's main method, or doing App a = new App() depending on how your application initializes
05:21	phillord	In your case, you have a clojure app I guess. So, why not start nrepl in the normal way (i.e. let cider do it) then call launch the app from inside the REPL
05:24	fdija	Thank you all! I can connect now. What seems to be working is to in my terminal run `lein repl :headless`, and in my repl run (-main). I'm writing a terminal-based text editor, and am writing the side-effect-heavy rendering code. So nice to not be running blind.
06:32	Olajyd	,(clojure.string/replace "hPPHp123hPHp" #"^[PH]+" "")
06:32	clojurebot	"hPPHp123hPHp"
06:39	Olajyd	can somebody help me with this (clojure.string/replace "hPPHp123hPHp" #"^[PH]+" "") I want the result to be “hp123hPHp”
06:40	nickenchuggets	hi
06:42	jeaye	Olajyd: Seems like you want #"PPH"
06:44	oddcully	jeaye: no i think OP wants the first occurance of any [PH]-chain removed
06:47	oddcully	,(.replaceFirst "hPPHp123hPHp" "[PH]+" "")
06:47	clojurebot	"hp123hPHp"
07:23	nickenchuggets	hmm
07:23	nickenchuggets	having some trouble accessing a dependency
07:23	nickenchuggets	I got lein set up
07:23	nickenchuggets	ran lein classpath, and it looks as though the dependency I've specified is on the classpath, as a jar file
07:24	nickenchuggets	I'm a clojure newb btw
07:25	nickenchuggets	I wonder if I need to lein javac
07:25	nickenchuggets	this is what I'm trying to do: https://gist.github.com/brlafreniere/abee9b5fa78babf5902f
07:26	nickenchuggets	this is the library I'm trying to use: https://github.com/Raynes/irclj
07:30	nickenchuggets	hmm, clojure is funky :P
07:32	vijaykiran	nickenchuggets: may be a bit more context will help - where's your clj code ?
07:32	nickenchuggets	I used lein to generate an 'app' structure
07:32	nickenchuggets	so it's in the standard places mostly
07:33	nickenchuggets	src/cljbot/core.clj
07:33	nickenchuggets	I see "Hello World" when I do lein run
07:33	nickenchuggets	so I think for the most part things seem to be working
07:33	nickenchuggets	but I can't seem to load that library, irclj
07:34	nickenchuggets	in the lein repl or in my src/cljbot/core.clj file
07:34	nickenchuggets	and I do have it listed in my project dependencies
07:34	nickenchuggets	and it appears to have installed when I run lein run
07:35	nickenchuggets	hmm, yeah, tried lein deps... all dependencies appear to be installed
07:36	nickenchuggets	can't (require '[irclj.core :as irc]) in lein repl
07:36	nickenchuggets	hmm, I have an idea
07:36	nickenchuggets	haha
07:37	nickenchuggets	hooray!
07:37	nickenchuggets	I fixed the problem
07:38	nickenchuggets	I looked up the library on clojars.org
07:38	nickenchuggets	and saw that it suggested a different version
07:38	nickenchuggets	instead of the version I was using
07:38	nickenchuggets	so I used the version suggested on clojars.org for that library, and it appears to be working now
07:39	nickenchuggets	:)
08:36	TMA	(inc rubberduck)
08:36	lazybot	⇒ 5
08:41	nickenchuggets	hehe
08:41	nickenchuggets	so I'm new to clojure, and it's kinda neat
08:44	gfredericks	luxbock: there are a couple issues you're hitting I think
08:46	gfredericks	1) is that gen/one-of and gen/elements do not grow from the beginning of the collection, which is because they both use gen/choose (which doesn't grow). I have in test.chuck an alternative to choose that does grow, so you could use it in your own version of gen/elements and gen/one-of if you wanted https://github.com/gfredericks/test.chuck/blob/5ed96e279334dfe47df9c9646b060d7fecf73ebf/src/com/gfredericks/test/chuck/generators.clj#L197
08:47	gfredericks	2) is that it sounds like you're making a recursive generator, which can be tricky w.r.t. sizing. have you looked at the built-in helper for recursive generators?
08:56	neurostorm	I have a vector with ["123" "#234" "#232" "324" "232" "#23"] and need to join lines starting with # with the prev line, so the result should be ["123#234#232" "324" "232#23"] , how can this be done?
09:07	hyPiRion	neurostorm: https://www.refheap.com/108426
09:08	neurostorm	Thx!
09:13	dabd	what are the advantages of clj's PersistentVector implementation over an implementation based on skew binary random access lists?
09:14	dabd	I was reading this post http://cstheory.stackexchange.com/questions/27820/is-there-a-purely-functional-vector-with-o1-access-to-the-front-and-back-but-o and the poster mentions it can be faster than the clj's implemention.
09:15	neurostorm	'(reduce
09:15	neurostorm	(fn [col i]
09:15	neurostorm	(let [last-idx (- (count col) 1)]
09:15	neurostorm	(if (= (first i) \#)
09:15	neurostorm	(assoc col last-idx (str (nth col last-idx) i))
09:15	neurostorm	(conj col i)))) [] ["a" "b" "#c" "d" "#e" "#f" "g"])
09:20	hyPiRion	dabd: cache and linear type utilisation mostly. PersistentVector has O(1) for last, and transients provide way faster batch modifications.
09:22	dabd	does the latest PersistentVector implementation use RRB-trees?
09:24	hyPiRion	dabd: core.rrb-vector gives you concatenation functions -- see https://github.com/clojure/core.rrb-vector
09:29	dabd	hyPiRion: I was wondering if those improvements made it into the PersistentVector implementation
09:31	dabd	but I see it is interoperable with the original PersistentVector implementation
09:32	hyPiRion	yeah, it's essentially just a set of functions that works over PVecs and RRBs without any (notable) penalty
09:33	Diabolik	does anyone have any suggestions for projects for a complete newbie to do as a first project?
09:33	Diabolik	im a rails dev by trade if that helps
09:44	gilliard	Diabolik: I would think you could get a good feel for the language by trying some of the problems at http://4clojure.com
09:46	magnars	I made a screencast making a game with Clojure and ClojureScript: http://parens-of-the-dead.com Hopefully it'll show how quick and fun it can be to use our language of choice. :-)
09:50	stain	nice!
09:50	stain	you put some effort into this
09:51	stain	what is that funny unicode-shell, btw?
09:51	wasamasa	lol, mutations ahead
09:51	wasamasa	that does indeed sound scary
09:52	magnars	stain: the shell is zshell with oh-my-zshell
09:52	magnars	gotta stay away from those mutations :)
10:08	stain	magnars: so when you first did this.. did you actually do the static HTML/CSS first and then write all the cljs afterwards, or is that just for the screencast?
10:09	magnars	yeah, I created some dummy HTML in an index.html file, and wrote the CSS and images for that.
10:11	stain	yeah, so you could prototype the view without thinking too much about the logic yet
10:11	magnars	exactly
11:02	jaaqo	#join WordPress
11:04	rhg135	I see
11:06	noncom	in clojure seesaw, there is the bind concept which allows controlling canges of values in atoms and such through gui, ok. but is there any concept for the reverse? i.e. if i change the value of the atom - can i make it so that the gui automatically reflects the change?
11:07	matthavener	noncom: check out 'add-watch'
11:07	noncom	oh, ok, so atom watches are the way..
11:08	matthavener	other that wrapping the atom update in your own abstraction to coordinate handling changes.. yep, as far as i know :)
11:09	noncom	i see... sadly this implies much manual work.. unless i write some automation macros for that..
11:09	noncom	i hoped there is something inside seesaw to make it work already..
11:09	noncom	but okey, i can manage :)
11:09	phillord	I am trying to add tools.nrepl to an existing maven build without changing the pom (i.e. as a per user setting). Anyone know if this is possible?
11:10	noncom	phillord: ummm not sure, but maybe pomegranate is what you need?
11:11	noncom	but it will require to have it itself in the deps..
11:11	phillord	if pomengranate were in the pom.xml then yes, it would be, but it isn't. And if I knew how to add pomengranate without changing the pom, then I could just do the same with tools.nrepl
11:11	noncom	well, you could extend the classpath for the jar on launch
11:11	phillord	how?
11:11	clojurebot	with style and grace
11:12	noncom	either via java standard method or..
11:12	phillord	I've thought about settings.xml but that only allows you to changes I don't want to change
11:12	noncom	https://clojuredocs.org/clojure.core/add-classpath
11:12	noncom	but that's deprecated, idk if it works
11:12	phillord	parent projects seem a way forward
11:13	phillord	oh, sorry, I don't have Clojure either
11:13	noncom	?
11:13	phillord	I want to add a clojure repl to an existing Java app
11:13	noncom	ah
11:13	phillord	or rather Java build
11:13	noncom	oh
11:13	noncom	well, i would do it the other way around
11:13	noncom	add the java app as a lib to to clojure
11:14	phillord	I could create a maven plugin that would do this, but then I can't add that either, since maven does not allow me to change that either.
11:14	noncom	just start the clojure as usual, but linking the java app jar to it via the classpath (see java cli options for that)
11:14	noncom	then you can start clojure and import all your java stuff
11:15	phillord	yes, I guess that is possible, although I have to create a new clojure project for every maven project to which I want to connect
11:15	noncom	not sure. you're saying you already have the java app jar?
11:16	noncom	why not just create a .bat or .sh for every java jar? (or even all of them)
11:17	noncom	java -cp clojure.jar clojure.main file.clj
11:17	noncom	thi sis the default command to launch clojure throught cli
11:17	phillord	no, I have a maven project with Java in it. Maven lets me run it, no worries. I want to run a clojure nrepl with maven, so that the clojure nrepl process has the environment of the Java project. Then I can use the nrepl to introspect over the java project.
11:18	noncom	you could do something like "java -cp java-app.jar nrepl.jar clojure.jar clojure.main file.clj"
11:18	noncom	not sure for the exact syntax of -cp though
11:18	phillord	I'm trying to add interactivity to a java development environment for Emacs
11:18	noncom	yes, i understand...
11:18	phillord	nrepl seemed like a nice option -- all working but I have to change the pom
11:19	noncom	why not 1) launch clojure project with nrepl 2) link your java app ?
11:19	noncom	think of your java app as a library...
11:19	phillord	because I don't want to build the Java project to jar every time, and anyway, the java app will be in a set of libraries.
11:20	phillord	I need to be able to recompile the Java and update the repl
11:20	noncom	recompile java with a running nrepl without restarting jvm?
11:20	phillord	yes -- that's been done (vinyasa does it)
11:21	noncom	ok, was going to suggest vinyasa :)
11:21	phillord	my roadblock is just getting maven to add nrepl (and my middleware) to the project
11:21	noncom	hmmmm and your java project also epends on loads of libraries, right?
11:21	phillord	exactly
11:22	noncom	uh..
11:22	phillord	although if pomengranate can add a "live" dependency -- i.e. a project directory rather than a fully build maven artifecact it might work.
11:23	phillord	it's very frustrating -- although that is a common emotion when working with maven
11:23	rhg135	You can do so through the class path option
11:24	phillord	rhg135 I can add a directory in this way, but I need to add a project with all of it's dependencies also
11:25	noncom	look at this: https://github.com/cemerick/pomegranate/blob/master/src/main/clojure/cemerick/pomegranate/aether.clj
11:25	noncom	does it look like it could work for you?
11:26	rhg135	Is there a way to get the class path from maven?
11:26	gilliard	https://maven.apache.org/plugins/maven-dependency-plugin/build-classpath-mojo.html
11:29	phillord	gillard: again, same chicken and egg -- only works if the dependency plugin is installed.
11:29	phillord	noncom: yes, it may be possible -- launch clojure then fix it up so that it looks like the project.
11:29	gilliard	you can just run mvn dependency:build-classpath without changing the pom.
11:33	phillord	gillard: okay, that might help. I run clojure with nrepl, then run maven to get build classpath, then add all of these to the clojure repl with pomengranate. Messy, but doable.
11:34	noncom	if you do not change the libraries too often, maybe you can formulate the project.clj deps out from the java app pom
11:34	noncom	but that is not a very functional approach.. rather it could save time, but i am not sure..
11:35	noncom	hey, you could also make a whole tool out of that. i am sure that could be useful to other people too
11:35	phillord	I've been the route before of trying to understand the maven pom. It's a terrible mess with no defined semantics and things never work as you expect.
11:36	blkcat	xml, barf.
11:37	noncom	well, maven helps completing some really complex tasks..
11:37	noncom	i am sure if anyone could come up with something more simple, it would have been adopted already worldwide..
11:37	phillord	XML is just a syntax -- it's the total absence of clear meaning that is problem. If maven had documentation that were, well, comprehensible it would be okay.
11:37	noncom	they say gradle is not that bad for interfacing with maven
11:38	phillord	noncom: I agree -- the only worse thing than using maven for building java is managing java dependencies without maven.
11:39	gilliard	ha. nicely put.
11:39	noncom	yeah
11:39	noncom	which is really strange because in reality, the dependencies are just a simple tree
11:41	phillord	not really, noncom
11:42	noncom	yeah, there are goals and conditions and stuff..
11:42	noncom	but..
11:42	phillord	you are forgetting time -- so, a dependency on "Clojure 1.2" is actually a dependency on 1.2 or later.
11:43	phillord	I will have a think on the awful ness of getting maven to report it's dependencies
11:43	phillord	might be easier.
11:43	gilliard	The dependency plugin has a few goals which might be useful.
11:43	Olajyd	how can I convert a string in to a verctor of strings given “ig” => [“i” “g”]?
11:43	justin_smith	phillord: it's not even as simple as that - because it won't look for "or later" unless some other dep demands it
11:44	justin_smith	Olajyd: what's the separation rule?
11:44	justin_smith	,(mapv str "ig") ; if the rule is "one string per letter"
11:44	clojurebot	["i" "g"]
11:44	phillord	justin_smith: that's my point -- it's actually a named directed graph, not a tree.
11:45	Olajyd	justin_smith yea sure
11:45	noncom	wtf.. http://joxi.ru/V2VnD95s5anW2v
11:45	justin_smith	phillord: right, agreed 100%
11:45	Olajyd	justin smith I have a problem in clojure and wish you could help me out?
11:45	justin_smith	noncom: wow, your client doesn't handle smart quotes at all :)
11:45	justin_smith	Olajyd: you can go ahead and answer the question, and I am sure someone will try to answer
11:46	noncom	seems so :) idk even what that means
11:46	Olajyd	ok
11:46	phillord	anyway, thanks for all the help -- I will consider the options.
11:47	justin_smith	noncom: http://i.imgur.com/FKwOTwk.png
11:47	justin_smith	"smart" quotes
11:47	noncom	wow, haha )
11:47	noncom	creepy
11:47	justin_smith	infamously inserted by some osx irc clients
11:47	justin_smith	and of course totally breaking code examples
11:48	justin_smith	Olajyd: oh where I said "you can go ahead and answer the question" that's weird and I meant "you can go ahead and ask the question" - you don't need to ask permission to speak on IRC
11:48	Olajyd	hahhaa
11:48	Olajyd	gotcha
11:50	Olajyd	implement a function that transforms a string by applying a regular expression to it. The first match is replaced by the replacement string. Replacing all matches can be achieved by using the 'g' (global) qualifier. This function allows virtually any perl-syntax regular expression to be applied
11:50	Olajyd	use cases:
11:51	Olajyd	To remove all occurrences of a 'P' or an 'H' at the beginning given a string “PH123p” => “123p”
11:52	oddcully	,(.replaceFirst "hPPHp123hPHp" "[PH]+" "")
11:52	clojurebot	"hp123hPHp"
11:52	Olajyd	Use case 2: To do the same as above but to catch both uppercase and lowercase P's and H's at the beginning and replace them with 000: given a string “PHpp123p” => “000123p”
11:53	justin_smith	Olajyd: I'd look at the various regex functions (they are grouped in one section on http://conj.io ) - with the right combo of them I am sure you can make some progress
11:53	Olajyd	aite thanks
11:54	justin_smith	Olajyd: also you could look at cond for handling the command switches like "g"
11:55	Olajyd	oddcully, the use of P and H actually mean all capital letters and not necessarily P and H
11:55	oddcully	i just mentioned it again on your previous question, since it was lost in disconnection
11:56	Olajyd	justin_smith does that also apply for the use of the “i” flag in the regex?
11:56	Olajyd	oddcully I’m sorry I didnt see it
11:56	justin_smith	Olajyd: yeah, I would use a regex to pull out the flags/options from your command, then use cond to figure out how to process the string given the flags
11:56	Olajyd	oh great
11:57	Olajyd	so I would create someting like isGobal? predicates right
11:57	justin_smith	I assume you also know how to use "let"
11:57	justin_smith	Olajyd: yeah, something like that
11:57	Olajyd	or something like isCaseSensitive? predicates too
11:57	Olajyd	ok
11:59	Olajyd	justin_smith I’m sorry but what exactly is the differene between [A-z]+ and [A-z]+
12:00	oddcully	looks the same to me
12:00	justin_smith	,(= "[A-z]+" "[A-z]+") ; a typo I am sure
12:00	clojurebot	true
12:01	noncom	when using grid layout, is there a way to force column width with seesaw?
12:04	Olajyd	justin_smith so exactly how can I check if an element exist in a vector?
12:05	Olajyd	using the ‘’some” method
12:06	oddcully	Olajyd: when i don't know if there is something around for my case, i consult http://conj.io/ and try a few "words" that might match my usecase
12:06	Olajyd	oddcully thanks buddie
12:51	shiranaihito	"halp." .. i'm having mysterious trouble with protocols / records - "class not found" or something, and now i'm trying to ":aot :all" in my lein project because i have no fucking clue what's wrong, but that's not working either: Compiling c2d.db.entity
12:51	shiranaihito	java.io.FileNotFoundException: Could not locate c2d/db/entity__init.class or c2d/db/entity.clj on classpath
12:51	shiranaihito	why does compiling a namespace require some sort of already-compiled thing for the namespace being compiled?
13:00	Olajyd	Hi, justin_smith
13:01	Olajyd	Hi, oddcully
13:05	shiranaihito	any educated guesses as to what the fuck is wrong with my code? (yes, i'm a bit irate.. :p) .. what's the most common "mistake" people make with protocols and records that would lead to a class not being found?
13:07	rhg135	aot
13:09	shiranaihito	rhg135: you'll have to be a bit more specific.. consider that i have no clue about the low-level details related to aot compilation and its relationship to protocols and records etc, and i don't even care.. i just want to get stuff done
13:10	justin_smith	shiranaihito: the most common problem is code being reloaded
13:10	justin_smith	shiranaihito: you'll end up with two classes with the same name, that are not the same class
13:10	shiranaihito	for example, apparently now i have a record that gets instantiated (potentially just fine), but when its used in a call to a protocol it implements.. nothing happens.. and now i'm not even getting any error messages anywhere
13:10	Olajyd	justin_smith help me optimize this code please..
13:11	Olajyd	justin_smith, (defn apply-regex
13:11	Olajyd	"Function to transforms the contents of a column by applying a regular expression to it"
13:11	Olajyd	[ row input ]
13:11	rhg135	usually aot compilation (or stale classes) messes it up
13:11	Olajyd	(let [{:keys [ col replacement qualifier]} input
13:11	Olajyd	isCaseSensitive? (some #(= "i" %) (mapv str qualifier))
13:11	shiranaihito	justin_smith: i'm not using a REPL though.. can something get reloaded in a problematic way anyway?
13:11	Olajyd	isGlobal? (some #(= "g" %) (mapv str qualifier))
13:11	justin_smith	Olajyd: if you just ask your question someone can probably help, I'm in the middle of trying to help shiranaihito at the moment
13:11	Olajyd	val (if (and isGlobal? isCaseSensitive?)
13:11	Olajyd	(clojure.string/replace (get row col) (re-pattern "[A-z]+") replacement)
13:11	Olajyd	(if (and (false? isGlobal?) isCaseSensitive?)
13:11	Olajyd	(clojure.string/replace-first (get row col) (re-pattern "[A-z]+") replacement)
13:11	Olajyd	(if (and (false? isGlobal?) (false? isCaseSensitive?))
13:11	Olajyd	(clojure.string/replace-first (get row col) (re-pattern "[A-Z]+") replacement)
13:11	Olajyd	(clojure.string/replace (get row col) (re-pattern "[A-Z]+") replacement))))]
13:11	Olajyd	(assoc row col val)))
13:11	Olajyd	ok gotcha
13:11	justin_smith	Olajyd: please don't paste multiple lines of code into IRC
13:12	oddcully	please don't paste large code snippets in here
13:12	justin_smith	use a pastebin site
13:12	justin_smith	refheap.com is good
13:12	shiranaihito	Olajyd: try www.refheap.com
13:12	rhg135	refheap ftw
13:12	Olajyd	Ok let me try that
13:12	justin_smith	shiranaihito: yes, bad things can happen if protocol definitions are reloaded and you have objects around that implement the older version of the protocol - even if the definition did not change
13:13	shiranaihito	justin_smith: how/why would the definitions get reloaded?
13:13	justin_smith	shiranaihito: what happens is then when compiling the namespace, a class is generated, and a new class is generated when you reload the namespace
13:14	Olajyd	so after pasting in pastebin do I post the link here or how will you get to see the code?
13:14	shiranaihito	justin_smith: do you mean at runtime.. ? i'm not using a repl.. ? what kind of situation are we talking about
13:14	justin_smith	shiranaihito: ring projects are set to auto-reload. If nothing is reloading your namespaces there is also the issue of AOT - where you can have some objects using the AOTd protocol and some using another definition loaded at runtime
13:14	justin_smith	shiranaihito: I'm trying to describe the common case, but there are a few ways this can bite you
13:14	shiranaihito	justin_smith: i'm actually not using ring - i've set up my own cute little web framework on top of an embedded Jetty
13:14	justin_smith	OK
13:14	oddcully	Olajyd: yes, paste the link
13:15	Olajyd	https://www.refheap.com/108436
13:15	justin_smith	Olajyd: the reason I suggested cond earlier is because it works out better than having if inside if inside if
13:16	Olajyd	ok
13:17	oddcully	Olajyd: that mapv in the let is copy-and-paste; use a let for it. but if you are just interested if there is a letter in the string you might as well just use .indexOf
13:18	justin_smith	Olajyd: instead of (if a b (if c d (if e f g))) you can have (cond a b c d e f :else g)
13:18	justin_smith	the transformation is pretty simple
13:19	shiranaihito	justin_smith: so what's a typical problem with protocols and records when no reloading is involved?
13:19	Olajyd	oddcully this is how I plan to call the function (apply-regex ["PPP123p" "1"] {:col 0 :replacement "000" :qualifier "ig”})
13:19	justin_smith	shiranaihito: the protocol is redefined, but the record is still extended to the older protocol (pre-redefinition), and this breaks the protocol mechanism
13:20	justin_smith	shiranaihito: since protocols have an interplay between ns/var level stuff and classes
13:20	shiranaihito	justin_smith: i've run into something before, but not like this.. at some point, i think the solution to some protocol-related problem was to require the related namespace .. but this is different
13:20	justin_smith	shiranaihito: OK
13:20	shiranaihito	justin_smith: damn you read fast.. :x
13:21	shiranaihito	justin_smith: how would i end up in a situation like you described?
13:22	justin_smith	shiranaihito: if you had a definition of the protocol visible thanks to AOT, then you had a namespace that used the protocol but did not require the protocol's namespace, so it used the AOT generated class, then another ns required the protocol namespace, causing a new class to be generated
13:22	justin_smith	shiranaihito: by any chance do you extend the protocol in any namespaces that do not require the ns implementing the protocol?
13:23	shiranaihito	justin_smith: and just to be clear, we're not talking about anything related to reloading code now.. ? :P
13:23	shiranaihito	(runtime etc)
13:23	justin_smith	at this point, no, not at all
13:23	shiranaihito	ok, cool
13:23	oddcully	Olajyd: i am talking about things, that are used over and over in the code (like (mapv str qualifier) and (get row col))
13:23	justin_smith	this is an interaction between the AOTd protocol class and the version created when the namespace is loaded at runtime
13:24	oddcully	Olajyd: don't copy that down. if it's used twice its a candidate for a let
13:24	Olajyd	oddcull gotcha
13:24	Olajyd	oddcully gotcha
13:24	shiranaihito	justin_smith: i only extend the protocol in the namespace it's defined in.. i'm just using it from another Lein project, where the lib containing the protocol is a dependency
13:26	justin_smith	shiranaihito: hmm, that should just work then
13:26	shiranaihito	justin_smith: yeah.. this is the most mysterious situation i've been in with Clojure.. and most of my troubles have been related to protocols.. :X
13:35	Olajyd	oddcully can you help me check out if this is ok https://www.refheap.com/108438
13:36	Olajyd	justin_smith if you are not in the middle of something can youalso help me check https://www.refheap.com/108438 out too :)
13:37	justin_smith	Olajyd: in general, it's good to use not instead of false? unless you know that your input is always a boolean
13:37	justin_smith	Olajyd: because in most things in clojure, both nil and false are considered "falsey"
13:37	justin_smith	,(false? nil)
13:37	clojurebot	false
13:37	justin_smith	,(if nil :huh? :OK)
13:37	clojurebot	:OK
13:38	justin_smith	it acts like false even though it is not false? - so it's usually better to use not instead of false?
13:38	shiranaihito	,(false? nil)
13:38	clojurebot	false
13:38	justin_smith	,(not nil)
13:38	clojurebot	true
13:39	Olajyd	justin_smith was thinking the isCaseSensitive ans isGlobal will always return a boolean
13:39	shiranaihito	so false? only evaluates to true for the actual "false" value, but not nil even though both are falsey?
13:39	justin_smith	yeah
13:39	shiranaihito	hmhm.. that's kind of unintuitive
13:39	justin_smith	Olajyd: oh, right, that's true. But "not" is still more idiomatic than "false?" generally
13:39	Olajyd	ok
13:40	Olajyd	justin_smith and more additions or subtractions ;)
13:40	justin_smith	,(some #(= \i %) "hi")
13:40	clojurebot	true
13:40	justin_smith	that way you don't need qailifier-vec
13:40	justin_smith	*qualifier-vec
13:41	Olajyd	justin_smith thanks… more corrections please :)
13:41	snowell	shiranaihito: false? is the same as (= false). It's not a test for (not true)
13:41	snowell	That would be not :)
13:41	shiranaihito	snowell: i get that it works the way it's intended to work.. i just said it's kind of unintuitive :p
13:43	snowell	Well I was used to Oracle PL-SQL, where (nil == nil) and (nil != nil) both return false. So I guess after that anything can make sense
13:44	justin_smith	shiranaihito: yeah, which is why "false?" should almost always be pre-emptively replaced with not
13:44	shiranaihito	justin_smith: yyep :p
13:44	justin_smith	shiranaihito: we should keep a community blacklist
13:44	justin_smith	flatten, false?, partition
13:44	justin_smith	I am sure there are others
13:45	shiranaihito	justin_smith: oh :p .. i didn't know flatten and partition were Bad somehow
13:45	justin_smith	~flatten
13:45	clojurebot	flatten is rarely the right answer. Suppose you need to use a list as your "base type", for example. Usually you only want to flatten a single level, and in that case you're better off with concat. Or, better still, use mapcat to produce a sequence that's shaped right to begin with.
13:45	shiranaihito	what's the problem?
13:45	oddcully	,(some #{\i} "ho")
13:45	justin_smith	~partition
13:45	clojurebot	nil
13:45	clojurebot	partition is probably not what you want; see partition-all.
13:45	oddcully	,(some #{\i} "hi")
13:45	clojurebot	\i
13:45	justin_smith	oddcully: that's fancy, but slower than the = check
13:46	oddcully	i suggested indexOf above ;P
13:46	justin_smith	:)
13:46	justin_smith	(inc oddcully)
13:46	shiranaihito	justin_smith: ok but what's wrong with using flatten instead of concat, for example, even if you only need to flatten one level?
13:46	justin_smith	shiranaihito: ##(flatten {:a 0})
13:47	justin_smith	,(flatten {:a 0})
13:47	clojurebot	()
13:47	justin_smith	,(flatten "hello")
13:47	clojurebot	()
13:47	shiranaihito	wtf
13:47	justin_smith	,(apply concat {:a 0})
13:47	clojurebot	(:a 0)
13:48	shiranaihito	justin_smith: so why does stuff disappear?
13:48	justin_smith	shiranaihito: also only the end user of a function knows whether "you only need to flatten one level" - so if you are writing a function someone else might use, you are severely restricting their data representation if you use flatten
13:48	justin_smith	shiranaihito: as the factoid mentions, imagine if your base case is a list or vector
13:49	justin_smith	shiranaihito: stuff disappears because flatten "takes a nested combination of sequential things" and I guess {:a 0} and "hello" are not sequential things
13:50	shiranaihito	justin_smith: alright, but i wasn't thinking about it from a library author's viewpoint.. just some random situation where you personally have a choice between flatten and whatever.. but it does look weird when stuff disappears like in your examples
13:50	justin_smith	shiranaihito: which is why concat is almost always the better choice
13:50	justin_smith	it's more controlled too, which means it is more flexible
13:57	sdegutis	What's a noble alternative to select-keys that includes nil keys?
13:58	justin_smith	,(select-keys {nil "OK" :a 0 :b 1} [:b nil])
13:58	clojurebot	{:b 1, nil "OK"}
13:58	sdegutis	My current solution is just ##(select-keys (merge {:a nil :b nil :c nil} {:a 1 :b 2}) [:a :b :c])
13:58	sdegutis	justin_smith: Sorry I meant absent keys.
13:59	justin_smith	,(let [wanted [:a :b]] (merge (zipmap wanted (repeat nil)) (select-keys {:a 0} wanted)))
13:59	clojurebot	{:a 0, :b nil}
14:00	sdegutis	So you'd use the same basic technique?
14:00	justin_smith	with less manual repitition, yeah
14:00	sdegutis	Right.
14:00	sdegutis	I wasn't sure how to manually create a map of nils for all given keys.
14:00	justin_smith	I mean that version could easily become select-all-keys or something
14:01	justin_smith	yeah, zipmap is probably the best bet for making that map
14:01	sdegutis	Well I only need it in one function so far.
14:01	sdegutis	Thanks bro.
14:01	justin_smith	np
14:03	sdegutis	Oh wow. Turns out that's what I was already using too.
14:03	justin_smith	hah, figures
14:03	sdegutis	I had this: (defn- entity-equals [a b] (let [a (merge (zipmap (keys b) (repeat nil)) (select-keys a (keys b)))] (= a b)))
14:04	sdegutis	Yours is way better tho.
14:04	sdegutis	Closer to the metal.
14:04	justin_smith	uh... if you say so
14:05	sdegutis	Yours being this: (defn- select-all-keys [m ks] (merge (zipmap ks (repeat nil)) (select-keys m ks)))
14:05	justin_smith	right
14:05	sdegutis	I'm totally using yours now, it's simpler.
14:06	sdegutis	Okay, I had two idiotic functions scattered in my tests: entity-matches? and entities-match? ... the former is completely removed from all my code!
14:06	sdegutis	Now to finish the latter... :D
14:26	gfrederi`	tcrawley-away: ping
14:31	sdegutis	IT WORKED!!!!!!
14:38	sdegutis	Finally got rid of functions that have been bugging me for 2 years.
14:39	sdegutis	Tons of them too.
15:26	crazydiamond	Hi. What do I need to use cljc files? I'm trying to include ns from cljc file in cljs file, but got an error "No such namespace"
15:34	gfredericks	crazydiamond: you have to be using clojure 1.7
15:35	crazydiamond	gfredericks, and I'm doing so
15:36	gfredericks	that's the only requirement I know of; you might check your cljsbuild configuration for source paths
15:36	gfredericks	crazydiamond: oh you might also need a recent version of cljs
15:36	crazydiamond	aha
15:39	crazydiamond	gfredericks, thanks, I'll check cljs version too. I'm using boot instead of lein, but it operates much the same
15:40	gfredericks	boot can build it!
15:40	gfredericks	~boot
15:40	clojurebot	Titim gan éirí ort.
15:40	gfredericks	~boot \|can build\| it!
15:40	clojurebot	In Ordnung
15:42	TEttinger	clojurebot: boot is where you hide the bodies... of Maven POMs, before you bury them forever.
15:42	clojurebot	Ok.
15:42	justin_smith	~boot
15:42	clojurebot	boot is where you hide the bodies... of Maven POMs, before you bury them forever.
15:43	TEttinger	I've not had the best experience with maven
15:44	snowell	Gradle makes maven a little more palatable
15:44	snowell	Then again, so does lein
15:45	TEttinger	I really have not liked gradle in the time I've had to use it with certain java libs
15:45	TEttinger	it's much much slower than maven
15:45	snowell	Hmm, not sure I've really seen that
15:46	snowell	Then again the only non-trivial migration I've done to gradle was from ant
15:46	snowell	So basically anything was better
15:48	justin_smith	if boot wants to take off, some sci-fi author needs to write a sequel to Leiningen vs. the Ants culminating in Boot wearing aliens that defeat Leiningen in a battle of wits.
15:48	TEttinger	also at least when this particular library switched to gradle (because android was moving that way, really), the IDE integration was really abysmal
15:48	TEttinger	every other IDE update would break gradle integration, no matter what IDE
16:15	tcrawley	gfredericks: pong
16:24	sveri1	TEttinger gradle 2 has sped up a lot of things and agreed the IDE support is bad, as long as the console does not count as IDE where it shines :-)
16:25	TEttinger	yep. it's definitely gotten better, I just wish lein or boot had something that was similarly succinct in the java-world
16:28	oddcully	it got "better" with recent intellij - if you generate some xmlblobs for intellij to tell it: you don't have a clue whats going on, right? better keep out of it - ymmv
16:30	TEttinger	yeah, that's what I always do now.
16:31	TEttinger	it's a pain when you need to change gradle and IDE settings to do certain things and project file regen is needed
16:33	oddcully	if its vital i extract the fragments from the .ipr file and inject them in the idea task
16:35	sveri1	hm, we encountered problems with eclipse, but all of them were solvable
16:38	sveri1	mostly related to target platforms
17:27	gfredericks	tcrawley-away: is it possible to use immutant.messaging w/o using jboss?
17:42	jcrossley3	gfredericks: sure
17:42	jcrossley3	depending on your definition of 'jboss' :)
17:46	jcrossley3	gfredericks: everything here (and more) works standalone, i.e. not deployed to wildfly (formerly known as jboss): https://github.com/immutant/feature-demo/blob/master/src/demo/messaging.clj
17:46	jcrossley3	you can check that project out and just 'lein run'
17:47	jcrossley3	or more specifically, 'lein run -m demo.messaging'
18:11	jborden	good afternoon.
18:13	jborden	I was wondering if there is a library for modifying your source code (clj,cljs) using a lein exec script or other method. e.g. I have a user.clj file which will send out an email when a new user is added to the system. I want to comment out the line that sends out the email for development and testing purposes but leave it in production.
18:14	jborden	basically, I want to be able to modify the source code and have different versions for 'development' and 'production'. Does anyone know of a library or lein plugin that does that?
18:21	eriktjacobsen	jborden Why do you want to modify the source code, instead of the more standard approach of using an environment variable or filesystem config?
18:22	eriktjacobsen	put a file in “/etc/jborden.config” for instance that has either “production” or “development” inside (or perhaps even email specific settings?) and have the program read from that at run-time to determine behavior
18:27	jborden	eriktjacobsen: So have an environment variables, say 'send-email?' , and a bunch of if statements in the code that (if (send-email?) (send-email args)) ?
18:28	eriktjacobsen	You could, or simply have an environment variable that sets things either to “dev” or “prod”. Here is some code from a project:
18:28	eriktjacobsen	http://pastebin.com/5F1iZAR3
18:29	eriktjacobsen	set-env! sets an atom, so rest of program can just do a check on (if (= @env :prod))
18:29	eriktjacobsen	but basically, yes
18:31	eriktjacobsen	if you want finer grain stuff than simply “dev/prod”, I’d recommend you use a filesystem config file that contains a map of variables, either serialized clojure (pr-str) or json, and then you load that as a map so you can pull out specific stuff and don’t have to juggle multiple environment variables
18:33	jborden	so I would basically keep my environment variables in a map and just set the environment I am in with a System/setProperty ?
18:35	jborden	{ :dev {:param1 "value"} :prod {:param1 "different-value"}} (System/setProperty "environment" ":dev")
18:37	jborden	OK I will do that if it is the more standard way of doing things, makes more sense than modifying the entire source tree because you can see what is going on
18:38	jborden	thanks eriktjacobsen
18:40	eriktjacobsen	jborden: multiple situations so going to restate for clarity…. the System/getenv is reading environment variables, so for instance you wouldn’t set that in the code, but you’d do something like “export PARAM=prod;java -jar asdf.jar (or lein run)” and then once that env is read into an atom (or whatever), all your conditional statements would be checking against either dev / prod. The second situation would be where
18:40	eriktjacobsen	you’d want finer grain control over stuff, in which case you would skip the environment variable and not care if you are in dev / prod at all, but rather have specific things like email in the config file (on the filesystem, separate from your deployed jar), then the conditionals inside code would work off that config map
18:54	rhg135	well, now my lazybot has datomic backed karma semi-working
18:55	rhg135	etting the schemas from the plugins was a pain
19:20	justin_smith	rhg135: I can't think of the last time someone took a joke I made that seriously
19:20	rhg135	I seriously was meaning to go to datomic
19:20	justin_smith	oh, OK
19:42	sotrhRaven	hello everyone
20:07	gfredericks	jcrossley3: okay, good to know, thanks!
20:14	rhg135	https://github.com/rhg/flutterbot/tree/datomic I was serious
21:07	justin_smith	,(whither)
21:07	clojurebot	⤊
21:07	justin_smith	,(whither)
21:07	clojurebot	⇣
21:07	justin_smith	,(repeatedly whither)
21:07	clojurebot	(⤉ ⬆ ⇍ ⇃ ➱ ...)
21:17	justin_smith	I should have named it ddr
21:54	TEttinger	,(defn ddr [] ((comp symbol str char) (rand-nth (concat (range 0x2190 0x2200) (range 0x27f0 0x2800) (range 0x2900 0x2980)))))
21:54	clojurebot	#'sandbox/ddr
21:54	TEttinger	,(repeatedly ddr)
21:54	clojurebot	(⇐ ⟷ ⥹ ⇓ ⇞ ...)
21:55	justin_smith	(inc TEttinger)
21:55	justin_smith	(ddr)
21:56	justin_smith	,(ddr)
21:56	clojurebot	⥋
21:56	TEttinger	,(ddr)
21:56	clojurebot	↖
21:56	TEttinger	how'd you do yours, justin_smith?
21:56	justin_smith	I really don't know how to do some of these dance moves
21:56	TEttinger	haha
21:56	justin_smith	TEttinger: much stupider
21:56	justin_smith	,(ddr)
21:56	clojurebot	⇰
21:56	TEttinger	yours can do some symbols mine can't
21:56	justin_smith	TEttinger: I had found a page with every unicode arrow like thing, and just made a string
21:56	TEttinger	oh yes
21:56	TEttinger	that is an option I considered
21:57	justin_smith	TEttinger: http://copypastecharacter.com/arrows
21:57	justin_smith	TEttinger: the best version would condense all the ranges on that page, of course
21:57	TEttinger	there are many arrows in weird unicode categories that aren't arrows, supplemental arrows A, or supplemental arrows B
21:58	TEttinger	,"\u27ac"
21:58	clojurebot	"➬"
21:59	TEttinger	,"\u2b90"
21:59	clojurebot	"⮐"
21:59	TEttinger	that's a tricky ddr move
21:59	TEttinger	"slip and fall"
23:57	justin_smith	,(->>[[8592 8703][9027 9032][9036 9037][9039 9040][9043 9044][9046 9047][9166][9650][9654][9660][9664][9735 9736][10132][10136 10159][10161 10174][10224 10239][10496 10538][10541 10569][10578 10619][11008 11025]](mapcat #(apply(fn([x][x])([x y](range x (inc y))))%))(map char)(apply str))
23:57	clojurebot	"←↑→↓↔↕↖↗↘↙↚↛↜↝↞↟↠↡↢↣↤↥↦↧↨↩↪↫↬↭↮↯↰↱↲↳↴↵↶↷↸↹↺↻↼↽↾↿⇀⇁⇂⇃⇄⇅⇆⇇⇈⇉⇊⇋⇌⇍⇎⇏⇐⇑⇒⇓⇔⇕⇖⇗⇘⇙⇚⇛⇜⇝⇞⇟⇠⇡⇢⇣⇤⇥⇦⇧⇨⇩⇪⇫⇬⇭⇮⇯⇰⇱⇲⇳⇴⇵⇶⇷⇸⇹⇺⇻⇼⇽⇾⇿⍃⍄⍅⍆⍇⍈⍌⍍⍏⍐⍓⍔⍖⍗⏎▲▶▼◀☇☈➔➘➙➚➛➜➝➞➟➠➡➢�
23:57	justin_smith	TEttinger: ^
23:57	justin_smith	TEttinger: I used a sort / reduce to generate those number ranges of course
23:58	TEttinger	ah nice
23:58	TEttinger	,(char 11025)
23:58	clojurebot	\⬑
23:59	TEttinger	,(map int "➢�")
23:59	clojurebot	(10146 65533)
23:59	TEttinger	ah, you got cut off and utf-8 took over
23:59	justin_smith	oh yeah that must have happened somewhere