#clojure log - Apr 04 2016

The Joy of Clojure
Main Clojure site
Google Group
List of all logged dates

0:00 TEttinger: two nested vectors since you used conj to add a new element instead of concat to append a collection

0:00 user_: ah

0:00 makes sense

0:00 TEttinger: ,(let [listInput [{:paths [[:node 1, :cost 1], [:node 2, :cost 2]]},{:paths [[:node 2, :cost 1], [:node 3, :cost 2]]},{:paths [[:node 0 :cost 1], [:node 1, :cost 2]]}] ] listInput) ; this is what gave 2

0:00 clojurebot: [{:paths [[:node 1 :cost 1] [:node 2 :cost 2]]} {:paths [[:node 2 :cost 1] [:node 3 :cost 2]]} {:paths [[:node 0 :cost 1] [:node 1 :cost 2]]}]

0:01 TEttinger: ,(let [listInput [] listInput (concat listInput [{:paths [[:node 1, :cost 1], [:node 2, :cost 2]]},{:paths [[:node 2, :cost 1], [:node 3, :cost 2]]},{:paths [[:node 0 :cost 1], [:node 1, :cost 2]]}])] (print (count (:paths(nth listInput 1)))))

0:01 clojurebot: 2

0:01 TEttinger: conj to concat works in your existing code

0:01 you were 3 characters off, that's all!

0:07 user_: TEttinger, lol

0:07 Any good Clojure games worthwhile to play?

0:08 Even ones written in Clojurescript

0:23 libertytrader: I have two collection of maps of the same type... i want to merge them. Do I have to convert one to a seq and then I can use conj?

0:23 or do i have to map conj over the seq or something?

0:27 oh concat sweet

0:31 tolstoy: Is there a handy function to remove a matching element from a vector?

0:33 dpzmick: tolstoy: https://clojuredocs.org/clojure.core/filterv

0:34 tolstoy: Alas. Nothing as clean is disj, eh? ;)

0:34 Anyway, thanks!

2:08 Oh, my: https://www.youtube.com/watch?v=pTArJBycP4Y (Beethoven Sympony 3 graphically presented.)

2:09 libertytrader: I have a problem... when I type "lein run" my app works

2:09 but the standalone uberjar does not work

2:09 no printf output

2:09 anyone have any ideas

2:10 cwgem|mac: Any good way to get the Clojure source with the various stdlib packages included? It seems like I have to download almost the entire clojure GitHub org repos to achieve that

2:10 tolstoy: In project.clj, make sure :main is set to the namespace of your project.

2:44 libertytrader: tolstoy cwgem|mac the problem was i needed to call flush

3:24 slester_: quick question, is there any reason jdbc's query function would require a lazyseq?

3:25 hiredman: what do you mean by require?

3:25 slester_: err, return. sorry. late.

3:26 hiredman: query's return value isn't actually lazy by default, query calls doall on it

3:26 slester_: I'm doing a (str (j/query db ["select * from table"])) thing and it prints out LazySeq

3:26 hiredman: the type is LazySeq, but by default the seq is entirely realized

3:28 seqs are sort like an iterator in java in that they represent a traversal of something

3:28 so query is return a traversal over the results of the query

3:28 slester_: sorry, there's also a :row-fn :name in there

3:28 hiredman: which makes so much sense that I bet whoever wrote it didn't even think about it

3:29 (if your question is "what is the

3:30 so if your question is literally "what is the reason it returns a seq" the answer is basically "that is the default stance of a clojure programmer"

3:32 if you question is "how do I get a readable printing of a seq" the answer is actually "str doesn't always return readable things, it just calls .toString, if you want to get readable things use the pr and prn family of functions"

3:33 slester_: the latter was it, thanks, I expected str to do the same thing as print

3:33 hiredman: not print, pr

3:34 slester_: well, in my function I had (let [x (j/query..)] (print x) x) and it printed out things

3:34 but I was doing (str "stuff:" (the-fn)) and it did not do what I thought it would do

8:09 Lewix: morning

8:36 irctc: Hi There

8:37 I am new to clojure and need some help in writing a clojure code to get data from json payload and send an email to interested parties

8:38 faxmodem: irctc: what did you try?

8:38 irctc: Need help in converting json payload which is non repeating into data structure

8:38 faxmodem: irctc: there's a lib for that I've used some time ago

8:38 cheshire or something

8:38 ridcully: irctc: do you have any specific problems to share? e.g. some code snippet + errors on some paste-site?

8:38 MJB47_: cheshire is the json goto i think

8:39 irctc: ya I have

8:39 { "apiVersion": "1.0", "messageId": "305536b9-36cf-4781-91d3-0a0600b30101", "timestamp": 1459082055277, "testEvent": false, "projectId": "vof_pratima-hello-world", "events": [ { "eventId": "REVIEW", "projectId": "vof_pratima-hello-world", "timestamp": 1459082038, "data": { "review": { "id": 27, "title": "test", "created": 1459082037700, "modified":

8:39 ridcully: please don't paste into irc. a) it cuts off your text, b) if you paste much the server might kill you because of flooding

8:39 irctc: I want to send email to the to email value

8:40 { "apiVersion": "1.0", "messageId": "305536b9-36cf-4781-91d3-0a0600b30101", "timestamp": 1459082055277, "testEvent": false, "projectId": "vof_pratima-hello-world", "events": [ { "eventId": "REVIEW", "projectId": "vof_pratima-hello-world", "timestamp": 1459082038, "data": { "review": { "id": 27, "title": "test", "created": 1459082037700, "modified":

8:41 The code I wrote for this is

8:42 (defn make-commit-msg [reviewevent] (get-in env ["review" 0 "id"]) ) (defn make-commit-email [event] (apply str (mapv make-commit-msg (get event "events"))) ) (deforch "Generic hook to send email when Merge request is created" (defstart :from :mergehook :when [ (event=? "REVIEW" ["events" 0 "eventId"]) ] :then (let [event (:event context)] (email "pratima.mangena@oracle.com" "[Generic webhook from webho

8:42 ridcully: well maybe i'm /ignored...

8:42 irctc: as of now I have hard coded the target email address however I should pull from the json payload

8:43 Empperi: irctc: do NOT paste stuff like that to IRC

8:43 use pastebin, refheap or similar

8:43 no one wants to read that from IRC

8:43 clojurebot: Cool story bro.

8:43 Empperi: clojurebot: ain't it?

8:43 clojurebot: Excuse me?

8:44 Empperi: clojurebot: you are a moron, but that's not your fault but your creators so it's cool

8:44 clojurebot: Huh?

8:44 faxmodem: clojurebot: consider yourself excused

8:44 clojurebot: Titim gan éirí ort.

8:44 irctc: where is paste bin

8:44 Empperi: google

8:44 first hit in google I'd gather

8:47 irctc: http://pastebin.com/9XEsvL93

8:48 is this accessible

9:13 Reposting my code

9:13 http://pastebin.com/9XEsvL93

9:13 Any clojure experts good at decoding the json payload for me

9:14 please respond

9:17 kwladyka: irctc do you have json and want convert it to edn?

9:17 (clojure data structure)

9:30 irctc: here is the json

9:30 http://pastebin.com/9M4EdN84

9:33 kwladyka: irctc what did you do to find a solution? It is in the first position on google. Or i don't understand your problem.

9:33 irctc: my json payload is http://pastebin.com/9M4EdN84

9:34 the code I wrote to pull the json payload is http://pastebin.com/9XEsvL93

9:34 I need help in traversing the payload using clojure code

9:35 I got a blank email with no body

9:35 kwladyka: you need conver json to end (clojure format) yes? if you use ring you can use wrapper, if you don't use ring you can use for example https://github.com/clojure/data.json (first position after write in google "clojure json")

9:35 irctc: where I expect review ID in the json payload

9:35 kwladyka: *end = edn

9:37 i don't know what you pass as parameter to this functions, i can only guess you don't paste edn data, but for example string

9:50 irctc please don't write to me on priv. It doesn't work like i will write code for you. I can give hints, fishing rod, sometimes fish, but i wouldn't do job for your.

9:52 RedNifre: Hey there. I'm currently reading JoC and the part about lists sharing their immutable data demonstrates this via "it's not only equal (= l1 l2) but also identical (identical? l1 l2)". This looks to me like "=" means "equal", but I vaguely remember somebody in this channel saying "use == for numbers" a while ago. So what's up with identical? vs = vs == ?

9:54 justin_smith: RedNifre: = uses structural equality for data structures, == is only for numbers and does value equality. = doesn't work across exact/inexact

9:54 ridcully: RedNifre: identical? is basically == from java (same "pointer"). = is basically equals from java. and == is == for numbers

9:54 justin_smith: ,(= 1 1.0)

9:54 clojurebot: false

9:55 justin_smith: ,(= '(1 2) [1 2])

9:55 clojurebot: true

9:56 justin_smith: ,(== 1.0 1)

9:56 clojurebot: true

10:00 RedNifre: ,(identical? 1 1)

10:00 clojurebot: true

10:01 RedNifre: I find the behaviour of = very strange.

10:01 ,(== '(1 2) [1 2])

10:01 clojurebot: #error {\n :cause "clojure.lang.PersistentList cannot be cast to java.lang.Number"\n :via\n [{:type java.lang.ClassCastException\n :message "clojure.lang.PersistentList cannot be cast to java.lang.Number"\n :at [clojure.lang.Numbers equiv "Numbers.java" 208]}]\n :trace\n [[clojure.lang.Numbers equiv "Numbers.java" 208]\n [sandbox$eval121 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval121 in...

10:01 justin_smith: ,(let [a '(1 2) b (cons 0 a) c (rest b)] (identical? a c))

10:01 clojurebot: true

10:02 justin_smith: == is only for numbers, the above demonstrates what JoC was saying - the fact that it's the same data

10:02 RedNifre: Would this be a good rule of thumb?: "Use == for numbers and = for everything else. You rarely need 'identical?'"

10:02 justin_smith: sounds right

10:02 also use = for numbers if you care about the precision

10:03 RedNifre: I find this strange because 1 and 1.0 seem more equal to me than '(1 2) and [1 2]

10:03 sdegutis: back

10:03 justin_smith: RedNifre: '(1 2) contains all the information [1 2] does, (float n) can lose information compared to n

10:04 RedNifre: I thought that '(1 2) was a different type than [1 2] and that 1 and 1.0 are precisely identical, even on the bit level in this case.

10:04 sdegutis: RedNifre:

10:04 justin_smith: RedNifre: that may be the case for 1.0 / 1, I forget, but definitely not the case generally for n / (float n)

10:05 sdegutis: ,(map type [1 1.0])

10:05 clojurebot: (java.lang.Long java.lang.Double)

10:05 justin_smith: RedNifre: clojure's equality cares about shape more than type

10:05 sdegutis: ,(map type [1 (float 1.0)])

10:05 clojurebot: (java.lang.Long java.lang.Float)

10:05 sdegutis: ,(map type [(int 1) (float 1.0)])

10:05 clojurebot: (java.lang.Integer java.lang.Float)

10:05 sdegutis: Hi

10:05 whatd i miss

10:06 good evening

10:11 RedNifre: WHat's shape? Is it "potential data"?

10:11 justin_smith: RedNifre: no, it is the layout (sequential, the count of the sequence, vs. lookup, the keys and vals of the lookup)

10:12 in general if (into (empty x) y) is the same as x, then x = y, if they agree regarding sequential or associative

10:12 wait that's bad and not always right

10:18 RedNifre: any two sequential things that are immutable (list, lazy-seq, vector) are = if their contents are all = in the same order

10:19 RedNifre: any two hash-maps (PersistentArrayMap, PersistentHashMap) are = if their key / val pairs are =

10:20 sdegutis: RedNifre: kinda like (= [1 2] '(1 2)) are "the same"

10:20 RedNifre: because all the things inside are considered equal in value

10:20 justin_smith: sdegutis: his question started with that

10:20 sdegutis: haha

10:20 oops

10:20 * sdegutis wanders away

10:22 sdegutis: Well, this is not going well.

10:22 I had an idea to create a macro, but it's causing an infinite redirect-loop.

10:25 shafire: hi

10:26 is someone using clojure with gradle?

10:26 sdegutis: hi

10:26 probably not.

10:26 shafire: more leiningen?

10:27 wink: lein or boot, yeah

10:28 Guest31160: is there a way to use everything in a ns except a certain function?

10:31 xemdetia: Guest31160, if you look on http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/ns there seems to be an :exclude directive that sounds like what you want

10:32 hamid: curiously asking.. why not dynamically specify size of the thread-pool? https://github.com/clojure/core.async/blob/master/src/main/clojure/clojure/core/async/impl/exec/threadpool.clj

10:33 or does that crosses some sort of philosophy in clojure's land?

10:34 xemdetia: https://github.com/clojure/core.async/commit/7b64bd8a22c2b6df69c23dce34eb66d705f5bf1a

10:34 looks like it was a deliberate change

10:40 sdegutis: i dont know many people who use boot yet

10:41 leiningen is still king and for good reason

10:41 boot may be good but it came in far too late to have a fair chance

10:42 phillord: I think you need to look at new projects -- if you're environment is already running in lein, why would you change?

10:42 but that's not a good predictor of the future

10:42 shafire: cursive don't support boot either

10:56 sdegutis: phillord: support is the main thing; more ides support lein than boot

10:57 phillord: also lein covers more cases since its older

11:00 phillord: sdegutis: true, but then boot is, I think, more easily extensible than lein, certainly in place

11:01 sdegutis: phillord: that may be true, but for 99% of cases, lein doesn't need to be extended because it already covers most use-cases

11:02 phillord: sdegutis: also true for Java. And,yet, we have clojure.

11:08 Glenjamin: are you including plugins in that sdegutis ?

11:08 sdegutis: Glenjamin: nope

11:08 but probably

11:09 Glenjamin: i suspect almost all clojure apps have at least one lein plugin

11:09 i dunno who's point that helps

11:34 sdegutis: Glenjamin: if our project at work has any, it's brought in by Cider

11:35 yep, that brings in exactly one plugin: [cider/cider-nrepl "0.11.0"]

11:41 so yeah, we could probably easily switch to boot

11:41 but the last time I tried, it had a bug when used with Cider:

11:42 if you jumped to the definition of a symbol within your project, instead of bringing you to your own file in that project, it brought you to a copy of it somewhere in ~/.boot or something

11:42 that made it pretty useless for me.

11:42 the boot folks said it might be fixed soon, and that was like a year ago, so maybe it is fixed now

11:42 Fin.

11:42 schmir: sdegutis: it's fixed

11:43 sdegutis: schmir: was it you i talked to about it?

11:43 arrdem: sdegutis: that's fantastically rude dude

11:43 be nice

11:43 schmir: sdegutis: no

11:43 arrdem: this is a public channel. Take it to pms if you don't want replies

11:43 sdegutis: arrdem: ... i cant even imagine what anything i said could be rude

11:44 schmir: oh, thought it might have been

11:44 schmir: i dont remember who it was i talked to in the boot chan about it

11:44 arrdem: oh, i see now.. you misinterpreted my reply to schmir in the most negative possible way

11:45 schmir: sdegutis: I did so too for a second :)

11:45 sdegutis: arrdem: look, i get that you have a grudge against me for a single thing i said years ago that you misinterpreted.. but stop being a prick to me every few months please, its getting really annoying

11:45 schmir: noted, sorry about that, ill be more careful

11:45 schmir: no problem

11:56 sdegutis: it's snowing.

11:57 kenbolton: sdegutis: northeast corridor?

11:57 sdegutis: chicago

11:57 kenbolton: snowing here 60 miles north of new york city.

11:58 sdegutis: i guess winter just doesnt want to leave this year

11:59 kenbolton: it only just arrived this weekend.

12:34 sdegutis: Fixed! Woo!

12:53 ,(update {} :foo (fn [foo] (-> foo (update-in [:bar :quux] (fnil inc 0)) (assoc-in [:string] "string!"))))

12:53 phew!

12:53 clojurebot: {:foo {:bar {:quux 1}, :string "string!"}}

12:54 kenrestivo: ugh https://www.refheap.com/116881 cider now refuses to work at all

12:57 * kenrestivo prepares to back down to nrepl.el if possible

13:01 sdegutis: kenbolton: you dont use cider?

13:02 wutf: anyone popping a ClojureScript repl from within emacs using C-c M-J as per here under Super Advanced? https://github.com/bhauman/lein-figwheel/wiki/Using-the-Figwheel-REPL-within-NRepl

13:18 justin_smith: kenrestivo: monroe or inf-clojure might be better options than nrepl.el these days - worth checking out at least

13:24 kenrestivo: also, the error you posted reminds me of the weirdness I have seen when updating cider.el in place - it works more cleanly if you nuke it and do a fresh install of another version

13:24 nuke and re-install clojure mode too, just for voodoo sake

13:26 sdegutis: kenbolton: I've had a lot of success with Cider fwiw, but ymmv

13:27 kenbolton: sdegutis: i appreciate that, but it was kenrestivo who was asking.

13:27 sdegutis: oh sorry kenbolton

13:27 kenbolton: no worries

13:28 sdegutis: kenrestivo: I've had a lot of success with Cider fwiw, but ymmv

13:28 ill just blame tab completion and hope it sticks

13:28 kenbolton: good enough

13:31 sdegutis: kenbolton: that said, cider is pretty cool

13:32 im constantly amazed by how good a clojure ide it is

13:32 plus i like that it integrates so nicely with emacs

13:32 phew, fixed like 4 major bugs this morning

13:32 kenbolton: i need to play with it. i know it was recently dropped into the jupyter clojure integration.

13:42 kenrestivo: it's very slick, but finicky

13:42 and not that stable, it seems

14:28 j-pb: I found a WAT

14:29 ,(= Double/NaN Double/NaN)

14:29 clojurebot: false

14:29 j-pb: ,(= '(Double/NaN) '(Double/NaN))

14:29 clojurebot: true

14:29 j-pb: WAT!

14:30 arrdem: j-pb: that's per the IEEE float spec

14:30 no wat at all

14:30 j-pb: arrdem: the IEEE float spec says that they are not equal UNLESS in a list?

14:30 arrdem: j-pb: oh. No. That's a WAT.

14:30 tavoris: What's the reason for them not being equal?

14:30 arrdem: Bug in CLJ equality probably.

14:31 j-pb: yeah

14:31 arrdem: tavoris: because NaN could be the result of arbitrary computation. There's no way to tell if two NaN results are from the same source, so NaNs can't be eqaul.

14:31 j-pb: test.check ftw this is breaking my code

14:32 ystael: ,(= [Double/NaN] [Double/NaN])

14:32 arrdem: yeah test.check is one of my favorite libraries

14:32 clojurebot: false

14:32 ystael: ...

14:32 arrdem: ystael: OH. I know what this is.

14:32 j-pb: not a bug!

14:32 luma: in the second case, you're comparing the symbols

14:32 arrdem: j-pb: it's the result of quoting. Right.

14:32 luma got it.

14:32 ane: ,(= '(a) '(a))

14:32 clojurebot: true

14:33 j-pb: arrdem: aaar yeah true

14:34 this thing is really hard to debug I can't copy paste stuff into the repl because it contains lists and NaNs :(

14:35 sdegutis: Today I replaced two inc with (fnil inc 0). It is a good day.

14:35 justin_smith: ,(pr-str (/ 1.0 0.0))

14:35 clojurebot: "Infinity"

14:36 justin_smith: ,(pr-str (/ 0.0 0.0))

14:36 clojurebot: "NaN"

14:36 justin_smith: yeah, those are not readable

14:36 arrdem: For no apparent reason.

14:36 j-pb: yeah

14:37 * arrdem throws that on the Jaunt issues list

14:37 ptisnovs: ,(Double/parseDouble "Infinity")

14:37 clojurebot: Infinity

14:38 ptisnovs: ,(Double/parseDouble "NaN")

14:38 clojurebot: NaN

14:38 ptisnovs: strange...

14:39 arrdem: tools.reader supports them, it's just that Clojure's built in reader doesn't.

14:39 sdegutis: ,(get {Double/NaN 3} Double/NaN)

14:39 clojurebot: nil

14:39 sdegutis: heheheheheh

14:40 ptisnovs: ,(Double/parseDouble "-NaN")

14:40 clojurebot: NaN

14:43 Bronsa: j-pb: '(Double/NaN) is a list with the *symbol* Double/NaN, not the NaN value

14:43 try comparing (list Double/NaN)

14:44 j-pb: Bronsa: yeah arrdem figured it out already ^^

14:44 by bad

14:44 Bronsa: now if you want a real WAT:

14:44 ,(let [x (identity Double/NaN)] (= x x))

14:44 clojurebot: true

14:44 Bronsa: ,(let [x Double/NaN] (= x x))

14:44 clojurebot: false

14:45 arrdem: Bronsa: I'm listening :P

14:45 j-pb: 0o

14:45 Bronsa: arrdem: where's the fun if I tell you? :) try decompiling the two

14:45 arrdem: Bronsa: my guess is downcast to object and then pointer equality.

14:45 Bronsa: almost correct

14:45 arrdem: I'll disassemble it inna bit.

14:46 Bronsa: well, let's not nitpick -- that was correct

14:46 two Double NaN *objects* can compare identical? but not equal

14:47 arrdem: Right, of course they are identical?, I guess I'm surprised that's what's being reached here tho.

14:47 Bronsa: = on double literals will use `lcmp` on the doubleValue, (identity) makes that a Util/equiv comparison

14:47 arrdem: Right.

14:48 ystael: ,(let [^double x (identity Double/NaN)] (= x x))

14:48 clojurebot: false

14:48 octe: if they are identitical they should be equal as well?

14:48 arrdem: octe: by the IEEE float spec they can't be.

14:48 octe: oh, for things like nan?

14:48 arrdem: yeah

14:48 octe: ah, gotcha

14:49 thats why you have the isnan functions, etc

14:49 arrdem: Bronsa: I guess I'm surprised that Util/equiv doesn't handle this case...

14:49 octe: right.

14:50 Bronsa: arrdem: eh, I think it's reasonable to short circuit equality on positive pointer checks

14:51 arrdem: fun thing is that this leats to difference in NaN handling between array-map and hash-map since they use different comparators

14:51 j-pb: *grabs a bucket*

14:51 arrdem: aha

14:51 Whenever I want to find yaks I just grep my logs for whenever Bronsa talks about "fun"

14:51 Bronsa: heh

14:52 j-pb: I hate floating point with a passion...

14:52 Bronsa: btw I wouldn't say that behaviour is inconsistent with the IEEE spec.

14:52 sdegutis: meh

14:52 arrdem: I'm surprised that CLJ-1074 Nan/Infinity reader support is the only open NaN ticket

14:52 Bronsa: the java spec guarantess that primitive doubles will be IEE 754

14:53 and that Double objects wrap a double primitive

14:53 but making (Double. NaN) === (Double NaN) is about jvm object semantics, not double semantics

14:54 ptisnovs: Bronsa: yeah, otoh the spec defines, that Double is object and == on objects compares pointers (err references)

14:54 Bronsa: ptisnovs: right, which is consistent with what we're observing

14:54 a comparing identical? but not equal

14:54 possibly surprising, sure, but not incorrect or inconsistent

14:55 TimMc: How do you feel about that part of the IEEE 754 spec? :-)

14:55 arrdem: TimMc: a yak beyond shaving :P

14:55 Bronsa: arrdem: http://dev.clojure.org/jira/browse/CLJ-1792

14:56 arrdem: Bronsa: huh you've found a bug in my JIRA -> org exporter.

14:56 Bronsa: this behaviour has nothing to do with NaN btw. any (reify Object (equals [_ _] false)) would work

14:57 arrdem: Yeah. JVM object equality is fundamentally hosed.

14:57 Bronsa: arrdem: is it one beer per bug? :P

14:57 TimMc: Sure, but .equals does declare some expectations of how it will behave.

14:58 (if you override it)

14:58 arrdem: Bronsa: if you ever make it to the states to collect :P

14:58 I should be keeping a scoreboard...

14:58 octe: TimMc, which is a great source of bugs, when people override it

14:58 :)

15:00 Bronsa: TimMc: it doesn't say anything about two values having to compare .equal if they are identical though

15:01 j-pb: arrdem: I just realized that this also occurs somewhere with the values generated by test.check

15:01 (gen/such-that #(= % %) (gen/vector gen/any-printable))

15:01 Bronsa: oh, it actually does I guess

15:01 `It is reflexive: for any non-null reference value x, x.equals(x) should return true.`

15:02 well, I guess the thing is it says it *should*, not it *must*? :P

15:02 j-pb: arrdem: this means that the NaN's slip past the such-that only to blow up my test (which checks if values serialize correctly to disk and deserialize correctly to memory)

15:03 Bronsa: lol, that's just pure evil

15:03 Bronsa: arrdem: seriously considering next clojure/conj btw

15:06 octe: ,(let [d (Double/parseDouble "NaN")] (.equals d d))

15:06 clojurebot: true

15:06 octe: was that not what you meant?

15:09 Bronsa: yeah of course, no inconsistency there. I was just referring to my prior example of (reify Object (equals [_ _] false)), which after reading the contract for Object.equals is probably wrong

15:09 s/wrong/invalid

15:10 octe: when I need to override equals i usually use lombok's @EqualsAndHashCode

15:10 j-pb: Bronsa: any tips on a workaround for that NaN object thing?

15:10 Bronsa: j-pb: what issue in particular?

15:10 j-pb: NaN sometimes being equal and sometimes not :/

15:11 Bronsa: avoid boxed NaN I guess?

15:11 j-pb: Yeah, but it seems that test.check/any already generates those ^^

15:12 tavoris: ,(identical? Double/NaN Double/NaN)

15:12 clojurebot: false

15:12 tavoris: ^ why?

15:12 j-pb: IEEE float spec

15:12 Bronsa: tavoris: that NaN gets boxed twice, resulting in two different objects

15:12 j-pb: ah really so this is already an autoboxed value?

15:12 crazy

15:14 Bronsa: actually that's probably comparing two unboxed NaNs in this case. either way, the only way to get NaN .equals NaN or identical to return true is to use the same boxed object

15:14 sdegutis: Infix is actually pretty cool.

15:16 octe: (let [d1 (Double/parseDouble "NaN") d2 (Double/parseDouble "NaN")] (.equals d1 d2))

15:16 ,(let [d1 (Double/parseDouble "NaN") d2 (Double/parseDouble "NaN")] (.equals d1 d2))

15:16 clojurebot: true

15:16 octe: looks like they do compare equal?

15:18 Bronsa: octe: clojure's = doesn't useq .equals on numbers

15:18 it compares the underlying primitive values

15:18 sdegutis: Bronsa: how tho?

15:18 ,(= 1 1.0)

15:18 clojurebot: false

15:18 sdegutis: manually? im confused

15:18 Bronsa: it's doing (identical? (.doubleValue Double/NaN) (.doubleValue Doubl/NaN))

15:19 j-pb: Bronsa: not in the example you posted however, right?

15:19 wouldn't that be considered a bug?

15:19 Bronsa: j-pb: which one?

15:19 octe: perhaps it's not relevant to the problem, but could always use Object's and .equals instead of clojure's = though

15:20 j-pb: ,(let [x (identity Double/NaN)] (= x x))

15:20 clojurebot: true

15:20 octe: might cause other uses :)

15:20 Bronsa: j-pb: that's short-circuiting that check alltoghether, because you're comparing two identical objects

15:20 j-pb: ah I see

15:20 Bronsa: so clojure sees that they're the same object and doesn't even bother comparing their values

15:21 ben_vulpes: that feel when (sh "rm" "-rf") is a better solution than the oodles of java on SO

15:21 rhg135: just remember "rm -rf" is implemented in oodles of C

15:22 ben_vulpes: until i get eval-as-opcode back i doooooon't really care

15:22 j-pb: Bronsa: hm I don't see why this-> is the case though :/

15:22 ,(= (read-string (pr-str Double/NaN)) (read-string (pr-str Double/NaN)))

15:22 clojurebot: true

15:23 j-pb: there they are not the same object, unless the jvm is some dark magic caching stuff

15:23 arrdem: Bronsa: hit me up if you do. I'll be fulltime and more mobile to do fun things as such.

15:25 Bronsa: j-pb: that's NaN the symbol, not NaN the value :P

15:25 ,(class Double/NaN)

15:25 clojurebot: java.lang.Double

15:25 Bronsa: ,(class (read-string (pr-str Double/NaN)))

15:25 clojurebot: clojure.lang.Symbol

15:26 Glenjamin: wha

15:28 j-pb: Bronsa: lol again wtf

15:28 Bronsa: arrdem: ah nice! found a clojure gig? I've been doing clj(s) fulltime since october myself

15:28 Glenjamin: Oh, I see now

15:28 ,(class (eval (read-string (pr-str Double/NaN)))

15:28 clojurebot: #<RuntimeException java.lang.RuntimeException: EOF while reading>

15:28 arrdem: Bronsa: neg. Opsy stuff at Twitter.

15:28 Glenjamin: ,(class (eval (read-string (pr-str Double/NaN))))

15:28 clojurebot: #error {\n :cause "Unable to resolve symbol: NaN in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: NaN in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6688]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: NaN in this conte...

15:28 j-pb: thi is just mean

15:28 Bronsa: arrdem: well that's just as good. gratz

15:29 arrdem: Bronsa: thanks! Now I just have to keep my fingers crossed that TWTR doesn't implode.

15:29 Bronsa: Glenjamin: no reader support for NaN (unless you use tools.reader)

15:29 Glenjamin: ,*clojure-version*

15:29 clojurebot: {:major 1, :minor 8, :incremental 0, :qualifier nil}

15:29 Bronsa: arrdem: uh, why would it?

15:30 arrdem: Bronsa: ongoing drama, stock price recently got thumped etc.

15:30 Bronsa: ah :/

15:30 Glenjamin: so, interestingly:

15:31 ,(pr-str Double/NaN)

15:31 clojurebot: "NaN"

15:31 Glenjamin: loses the "namespace", although it wouldn't work anyway

15:31 Bronsa: s/interestingly/infuriatingly is probably more appropriate in those cases

15:31 Glenjamin: I think that's just how Double toStrings NaN

15:31 arrdem: probably

15:32 Glenjamin: ah

15:32 Bronsa: ,(.toString Double/NaN)

15:32 clojurebot: "NaN"

15:32 Glenjamin: yeah

15:33 Bronsa: I guess one could argue that (pr-str Double/NaN) should return #=(java.lang.Double/parseDouble "NaN") or ¯_(ツ)_/¯ the method is called

15:33 s/¯_(ツ)_/¯/whatever/

15:33 *sigh*

15:33 machinewar: does map impliclty turn structure its mapping over into a seq?

15:33 arrdem: that's ... awful

15:33 Bronsa: or just make NaN/Infinity special reader tokens

15:33 arrdem: Why would you want to leak that JVM platform detail when you can make NaN/Infinity special.

15:33 Bronsa: like nil/true/false (that's what tools.reader does)

15:34 arrdem: because one you can monkey-patch without forking clojure, the other you can't? :P

15:35 arrdem: Bronsa: well I mean... I've cast my dice on that matter.

15:36 Bronsa: well then there might a patch ready to go in jira

15:37 arrdem: I think you missed the part where I reformatted literally everything with a commit message along the lines of "yolo"

15:37 Glenjamin: NaN and Infinity also exist in cljs and have identical semantics

15:37 dunno about CLR though

15:38 s/cljs/JS/ i guess

15:38 Bronsa: don't think you can embed them as literals in cljs

15:38 last I remember if you tried you'd get the compiler to explode because tools.reader would return a Double/NaN and compiler.clj didn't know what to do with it

15:39 uh -- apparently they made it work

15:39 Glenjamin: i mean, if Clojure defined NaN and Infinity as special in the reader

15:39 it could be portable

15:39 oh?

15:40 Bronsa: I just tried typing NaN and Infinity in a cljs repl and it worked

15:40 Glenjamin: yeah, weird

15:40 i would have expected it to need js/

15:41 arrdem: Remember, the reader can do whatever it wants to :P Shen implements their entire macro system in the reader...

15:42 Bronsa: ah, nice. [+-]Infinity and NaN are valid javascript constants

15:42 so it's just working out of the box thanks to tools.reader and Double.toString

15:46 arrdem: FWIW http://dev.clojure.org/jira/browse/CLJ-1074 patch is trivial

15:48 arrdem: Bronsa: yeah I saw it. Now https://github.com/jaunt-lang/jaunt/issues/125

15:49 Bronsa: this syntax highlighting.. not even wrong https://github.com/clojure/tools.reader/blob/master/src/main/clojure/clojure/tools/reader.clj#L316

15:49 I can't believe they haven't fixed it yet :/

15:52 hiredman: machinewar: the doc string specifically starts off saying it returns a seq

15:54 machinewar: thanks for heads up hiredman

16:07 sdegutis: back

16:18 Is there a way to dissoc a bunch of keys from a map inside a call to (update) without creating a temporary function?

16:18 I currently have (update :things (fn [things] (apply dissoc things ks)))

16:18 And it just feels weird, and like it's what as-> was made for, but I don't see how to use as-> here.

16:23 zilti: Is there a place I can find some actual documentation of core.logic? All I can find is the official API page which is even incomplete.

16:24 AimHere: zilti, you can always quiz dnolen about it - hes right here!

16:25 amalloy: sdegutis: (apply dissoc foo :things ks)

16:25 er

16:25 (apply update foo :things dissoc ks)

16:28 dnolen: zilti: there's a lot of documentation of varying quality - if you really want to understand it though you probably want to read The Reasoned Schemer along with some of the papers.

16:29 sdegutis: amalloy: ah!

16:29 zilti: dnolen: Ok. But there isn't like a complete API around? That would already help quite a bit. The "official" one e.g. doesn't even have the core "unify".

16:30 dnolen: zilti: http://clojure.github.io/core.logic/

16:30 if stuff is missing that's low hanging fruit for someone to work on

16:31 zilti: dnolen: Yes, that's the API docs I mean. clojure.core.logic/unify is missing there among others

16:32 dnolen: ok, docstring patches are welcome

16:33 sdegutis: thanks amalloy

16:33 zilti: dnolen: ok. I'll spend some time with the papers I guess, and reasoned schemer, and keep that in mind.

16:33 sdegutis: I didn't even consider that.

16:33 I still have to use as-> outside the apply, but that's fine.

16:40 Yay! Finally found a use for (comment)

16:54 Lewis: https://gist.github.com/6ewis/ce8f86f31cf3f00845965a4e888f7331

16:54 whats that extra stuff on line 5 and 6

16:54 arrdem: Lewis: lines 3,4,5 are fn metadata.

16:55 Lewis: (fn [x] `(. clojure.lang.Numbers (isPos ~x))

16:55 and this (. clojure.lang.Numbers (isPos x))

16:57 arrdem: line 4 is an inline macro. If you write (pos? 3) rather than taking pos? as a value, then the compiler will rewrite that to ((fn [x] `(. clojure.lang.Numbers (isPos ~x))) 3) -> (. clojure.lang.Numbers (isPos 3))

16:57 that's an interop form which makes use of the implementation detail class clojure.lang.Numbers, which provides a Java implementation of the positivity check on many types.

17:48 sdegutis: When is definline useful?

17:55 kwladyka: sdegutis i guess when you really care about performance

17:56 and also when for some reason want have to run some code exactly at "this" place. For example because it will return some debug information during error with the place where it is call.

17:56 if you know something about assembler you should catch this immediately

17:57 if not i don't know how to explain it shortly :)

17:57 i am going to sleep, goodgnight

18:47 maru: does anyone know how to fix this cljs compilation error https://gist.github.com/darwin/3aeb13d9e3631a4c421d

18:47 "Warning: environ value true has been cast to string" WTF

19:16 sdegutis: ,(case 1 2 (prn 2) 3 (prn 3) (prn 1))

19:16 clojurebot: 1\n

19:16 sdegutis: ,(case 1 2 (prn 2) 3 (prn 3))

19:16 clojurebot: #error {\n :cause "No matching clause: 1"\n :via\n [{:type java.lang.IllegalArgumentException\n :message "No matching clause: 1"\n :at [sandbox$eval51 invokeStatic "NO_SOURCE_FILE" 0]}]\n :trace\n [[sandbox$eval51 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval51 invoke "NO_SOURCE_FILE" -1]\n [clojure.lang.Compiler eval "Compiler.java" 6927]\n [clojure.lang.Compiler eval "Compiler.java" 68...

19:16 sdegutis: ,(case 1 2 (prn 2) 3 (prn 3) nil)

19:16 clojurebot: nil

19:16 sdegutis: It short-circuits? Nice.

19:27 gizmo385: Anyone here familiar with instaparse?

19:29 amalloy: ~anyone

19:29 clojurebot: anyone is anybody

19:29 amalloy: sigh

19:29 ~ask

19:30 clojurebot: The Ask To Ask protocol wastes more bandwidth than any version of the Ask protocol, so just ask your question.

19:30 sdegutis: :)

19:30 ben_vulpes: cute

19:31 sfz-: q: `lein test` shows 2 FAILs in output but summary prints `0 failures, 0 errors.` Has anyone seen this before or know what the issue might be?

19:35 gizmo385: I'm trying to parse a C-style language with Instaparse and I'm having issues getting the comments to work. I've tried writing a custom whitespace parser and installing that alongside my C parser, but the comment parsing is breaking the normal parsing. Anyone have experience with parsing comments in Instaparse?

19:36 TEttinger: gizmo385: sorta

19:36 I know where in the docs it gives it as an example :)

19:36 gizmo385: I've tried adapting the whitespace example from the experimental features documentation, but it stills seems to break

19:38 TEttinger: https://github.com/Engelberg/instaparse/blob/master/docs/ExperimentalFeatures.md#auto-whitespace

19:38 oh ok

19:38 yeah that was what I knew so far

19:38 I haven't used instaparse myself, I found it when someone asked a few months ago

19:39 gizmo385: Yeah, I've tried just copy and pasting the auto whitespace example from the docs and just using that and it spits out error messages that I haven't seen before

19:43 sfz-: Here's the details of my question posed above: http://stackoverflow.com/questions/36414730/clojure-leiningen-test-fails-not-shown-in-error-summary

19:44 gizmo385: I've managed to get the example in the experimental features to work, but attempting to change the parenthesis to slashes causes grammar parsing errors

19:45 TEttinger: hm. is / a special char?

19:48 gizmo385: I think I got it to work? It seems like it might have been an issue with escaping

19:53 amalloy: sfz-: your assertions should be inside (deftest foo ...) definitions, not at the top level of a file

19:54 sfz-: amalloy: Thank you! That was it. I accidentally put them in a `def` instead of `deftest`. +1 internets for you

20:49 wombawomba: can I make leiningen run a code snippet whenever any task is started with a particular profile?

20:50 alternatively, can I make it run a code snippet whenever any task is tarted, with the current profile(s) as argument(s)?

20:51 kylepotts: wombawomba: look up the :prep-tasks option

20:54 wombawomba: kylepotts: afaict, :prep-tasks is only useful for running shell commands

20:54 I want to run a function in my project, analagously to [:repl-options :welcome]

21:08 is there any way to tell which leiningen profile is being used in my code?

21:10 kylepotts: wombawomba: Look at the Dynamic Eval section here

21:10 https://github.com/technomancy/leiningen/blob/master/doc/PROFILES.md

21:11 that should answer your first question

21:13 wombawomba: kylepotts: hmm, yeah... but can I call my own code using dynamic eval?

21:13 seems like it would be run before loading the project namespaces

21:13 kylepotts: that is defined in the module? You could eval a section of your code and then run the function

21:15 wombawomba: hmm, so I could do something like #=(eval (do (require '[my-ns :refer [my-code my-val]]) (swap! my-val (my-code "foo")))?

21:16 kylepotts: something along those lines

21:17 wombawomba: and my-val would have the value I set once it's loaded later?

21:17 where would I put this?

22:31 sdegutis: Wow. I was so very wrong. Just, wow.

22:32 Cider is really really really cool.

22:32 Way cooler than I ever realized.

22:34 user__: sdegutis, very nice

22:34 sdegutis: Hello. Is there a way to "find out" which dependencies (and sub-dependencies) are making my Leiningen project's resulting uberjar so large? (x-post from #leiningen)

22:35 For example, it turns out that a certain library I'm depending on depends upon Instaparse, which means I'm indirectly depending on Instaparse, so that it gets pulled into my project.

22:44 user__: :)

22:44 justin_smith: ping!

22:44 justin_smith: hi

22:44 sdegutis: justin_smith: https://github.com/xsc/lein-ancient

22:44 "Check your Projects for outdated Dependencies"

22:44 "Dependencies: out of date"

22:45 justin_smith: I thought you'd find that funny :)

22:45 justin_smith: also I didn't expect you to be awake && online.

22:45 justin_smith: amazingly, you caught me just as I got home and on my computer again

22:46 sdegutis: ha!

22:47 justin_smith: I just walked home (4.5 miles)

22:47 an hour so of understimulation a day is nice

22:49 sdegutis: justin_smith: thats a long walk, is that usual fo you?

22:49 justin_smith: at least a few times a week, some times both ways in one day but more often just one way

22:50 it's nice to have time with no real input

22:50 walking doesn't take much intellectual activity

23:07 user__: yes, walking is incredible

23:07 especially with the better weather coming

23:24 sdegutis: justin_smith: that sounds healthy physically and mentally

23:24 justin_smith: relatedly, my wife and i have a new rule for our kids, 20 minutes of silence per day at like 3pm

23:25 justin_smith: cuz we often read about how important some silence every day is, so we're trying to put it into practice

23:25 eventually i hope to make it a full hour of silence every day

23:27 tolstoy: sdegutis: Have you tried "lein with-profile production deps :tree"?

23:27 sdegutis: tolstoy: hmm not the with-profile part

23:27 tolstoy: but `lein deps :tree` didn't seem very informative in terms of telling me how big the deps are

23:28 tolstoy: Yeah, not size. The with-profile production is (I think) the profile uberjar uses, so no plugins or test libs, etc.

23:29 sdegutis: My uberjars (standalone) tend to be 19M or so.

23:29 sdegutis: hmm mine are around 60mb

23:29 :/

23:31 tolstoy: lein with-profile production classpath | sed -e 's/:/ /g' | fmt -1 | grep jar

23:32 That'll list all the jars. How to find the sizes? Hm.

23:33 sdegutis: tolstoy: never mind it, I'm not going to pursue it today, thanks though :)

23:33 ,(update {:foo 3} :foo ((constantly nil)))

23:33 clojurebot: #error {\n :cause nil\n :via\n [{:type java.lang.NullPointerException\n :message nil\n :at [clojure.core$update invokeStatic "core.clj" 5960]}]\n :trace\n [[clojure.core$update invokeStatic "core.clj" 5960]\n [clojure.core$update invoke "core.clj" 5952]\n [sandbox$eval25 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval25 invoke "NO_SOURCE_FILE" -1]\n [clojure.lang.Compiler eval "Compiler.j...

23:33 sdegutis: ,(update {:foo 3} :foo (constantly nil))

23:33 clojurebot: {:foo nil}

23:33 sdegutis: bwaha

23:34 tolstoy: lein with-profile production classpath | sed -e 's/:/ /g' | fmt -1 | grep jar | xargs ls -l

23:34 Heh. ;)

23:34 justin_smith: ,(update {:foo 3} :foo :kasldfjlkasdjflkdsa)

23:34 clojurebot: {:foo nil}

23:34 sdegutis: justin_smith: clever

23:34 ,(update {:foo {:kasldfjlkasdjflkdsa 3}} :foo :kasldfjlkasdjflkdsa)

23:34 clojurebot: {:foo 3}

23:34 user__: Quick question: If I have a vector in a vector, how do I access one of those sub-vectors for location?

23:34 sdegutis: justin_smith: not fool-proof tho

23:35 kenrestivo: tolstoy: lein with-profile production classpath | sed -e 's/:/ /g' | fmt -1 | grep jar | xargs ls -l |awk '{print $5 " " $9}'

23:35 user__: --(1(:subVectors(someVector)))

23:35 tolstoy: There it is. :)

23:35 kenrestivo: tolstoy: lein with-profile production classpath | sed -e 's/:/ /g' | fmt -1 | grep jar | xargs ls -l |awk '{print $5 " " $9}' |sort -nr |less

23:35 sorry couldn't help myself

23:36 justin_smith: ,(get-in [[] [0 1]] [1 1]) user__

23:36 clojurebot: 1

23:36 user__: Sorry, the question was: Quick question: If I have vectors in a vector, how do I access one of those sub-vectors for location?

23:36 tolstoy: Yeah, sort.

23:36 justin_smith: ,(get-in [[] [0 1 :foo]] [1 2]) user__

23:36 clojurebot: :foo

23:36 user__: justin_smith, very nice

23:37 I love Clojure's simplicity

23:37 tolstoy: Hm. Clojure and Netty take up about 7MB. Add 2 more for bouncycastle.

23:37 user__: Interesting

23:38 kenrestivo: aaand the total is:

23:38 lein with-profile production classpath | sed -e 's/:/ /g' | fmt -1 | grep jar | xargs ls -l |awk '{print $5}' | paste -sd+ | bc

23:38 tolstoy: No paste on osx. ;)

23:38 kenrestivo: which i guess will be the size of a uberjar

23:39 sdegutis: Is jetty the de facto best Clojure HTTP lib?

23:39 tolstoy: Yeah, it's more about figuring out which libs are taking up most of the size.

23:39 sdegutis: for simple HTTP that doesn't need any bells and whistles

23:40 tolstoy: sdegutis I use either aleph or http-kit. I bet "de factor" is people making war files (outside of one's own hobby hacking).

23:41 sdegutis: hmm

23:41 tolstoy: http-kit is nice because it's so small. No dependencies.

23:44 sdegutis: The only reason I use Jetty is because ring-jetty comes bundled with [ring "0.4.0"] from inside github.com/ring-clojure/ring

23:45 So it seemed like a reasonable default to use.

23:54 kenrestivo: is tehre some reason why (slurp "~/some-file-i-know-actually-exists") isn't working anymore?

23:54 does clojure and/or slurp not deal with ~/ ?

23:55 tolstoy: Doesn't work for me, either.

23:55 kenrestivo: it used to

23:55 i think

23:56 tolstoy: Just tried it with clojure.java.io: no go.

23:57 kenrestivo: i'll have to pull $HOME out of the java env then

23:57 maybe that's what i did before

23:57 tolstoy: ,(System/getProperty "user.home")

23:58 clojurebot: #error {\n :cause "denied"\n :via\n [{:type java.lang.SecurityException\n :message "denied"\n :at [clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]}]\n :trace\n [[clojurebot.sandbox$enable_security_manager$fn__835 invoke "sandbox.clj" 69]\n [clojurebot.sandbox.proxy$java.lang.SecurityManager$Door$f500ea40 checkPropertyAccess nil -1]\n [java.lang.System getProperty ...

23:58 tolstoy: Thought so. Nice.

23:59 cwgem|mac: Nice to see a language that doesn't explode on you when you try and use string manipulation on multbyte strings

23:59 kenrestivo: (str (get (System/getenv) "HOME") "/.stuff.edn")

Logging service provided by n01se.net