spencer/software_slacks · Datasets at Hugging Face

workspace stringclasses 4 values	channel stringclasses 4 values	text stringlengths 1 3.93k	ts stringlengths 26 26	user stringlengths 2 11
clojurians	clojure	I'd just use Java for that.	2017-10-28T21:39:36.000060	Bibi
clojurians	clojure	Yea, that makes sense.	2017-10-28T21:40:15.000016	Araceli
clojurians	clojure	yeah - particularly because of the issues with boxed numerics, it's just easier to write a bit of java once you know which code has to be that fast	2017-10-28T21:40:34.000009	Margaret
clojurians	clojure	<@Margaret> True. Although, it seems like (from what I can tell from <http://insideclojure.org/2014/12/15/warn-on-boxed/>), unboxed math is possible in Clojure.	2017-10-28T21:41:45.000048	Araceli
clojurians	clojure	it's possible, it's a pain to get right	2017-10-28T21:43:17.000022	Margaret
clojurians	clojure	<@Bibi> <@Jonas> <@Margaret> Well, thank you for your responses. I think I should go reconsider what I am doing and why, as it sounds like I may be entering "when all you have is a hammer" territory.	2017-10-28T21:43:23.000001	Araceli
clojurians	clojure	I think one of the nice things for clojure is that if you do want to use some of the great work in the jvm ecosystem, you can use it as needed	2017-10-28T21:44:06.000100	Jonas
clojurians	clojure	So, I just went to look at the Benchmarks Game to see how they micro-optimized algorithms in Clojure. Unfortunately, it looks like, at some point recently, they removed Clojure from their languages list.	2017-10-28T21:47:42.000084	Araceli
clojurians	clojure	Wat?	2017-10-28T22:54:01.000049	Sonny
clojurians	clojure	Looks like it was removed from the web site on sept 20th, along with scala?	2017-10-28T23:10:09.000033	Sonny
clojurians	clojure	32-bit core is available <http://benchmarksgame.alioth.debian.org/u32/>	2017-10-28T23:32:05.000045	Lovie
clojurians	clojure	<@Lovie> Looks like that one's full of dead links, unfortunately. I can click into the language pages, but not the implementation source code pages. It just returns 404 Not Found.	2017-10-28T23:51:48.000046	Araceli
clojurians	clojure	2016 clojure removed? Guess we'll have to wait until 2032... "abandoned in 2002...restarted in 2004...continued from 2008...Everything has changed; several times." <https://benchmarksgame.alioth.debian.org/sometimes-people-just-make-up-stuff.html>	2017-10-29T02:24:42.000026	Lovie
clojurians	clojure	anyone know a handy way to detect circular dependencies in graphs?	2017-10-29T05:03:15.000064	Kristy
clojurians	clojure	I took a look at ubergraph and loom, no luck	2017-10-29T05:03:39.000001	Kristy
clojurians	clojure	<https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm>	2017-10-29T05:05:53.000045	Hedwig
clojurians	clojure	should be translated to clojure very quickly	2017-10-29T05:06:03.000024	Hedwig
clojurians	clojure	can eventually try out, thanks! meanwhile checking if I can steal something off `stuartsierra/component `	2017-10-29T05:06:45.000043	Kristy
clojurians	clojure	<https://github.com/stuartsierra/dependency/blob/master/src/com/stuartsierra/dependency.cljc#L89>	2017-10-29T05:11:43.000056	Kristy
clojurians	clojure	@vemv isn't <http://aysy.lu/loom/loom.alg.html#var-dag.3F> what you need ?	2017-10-29T05:28:20.000038	Rosia
clojurians	clojure	guess so! `(def has-circular-dependencies? (complement dag?))` ?	2017-10-29T05:48:35.000005	Kristy
clojurians	clojure	yes, a dag has no cycle by definition	2017-10-29T06:04:42.000022	Rosia
clojurians	clojure	this function won't give you the culprit however	2017-10-29T06:06:02.000024	Rosia
clojurians	clojure	Does anyone know how to add accents or diacritical marks to characters? As in add ¨ to a to make ä?	2017-10-29T06:08:06.000049	Jermaine
clojurians	clojure	Found that you can do "e\u0305".	2017-10-29T06:23:56.000080	Jermaine
clojurians	clojure	<https://github.com/funcool/clojure.jdbc> Comparing to java.jdbc I like clearer docs and simpler API, especially that there's a difference between connections/dbspecs and how transactions are implemented. Other advantages are pointed out in the FAQ: <http://funcool.github.io/clojure.jdbc/latest/#why-another-jdbc-wrapper>	2017-10-29T07:59:36.000001	Adele
clojurians	clojure	By chance I happened across this yesterday: <http://clj-me.cgrand.net/2013/03/18/tarjans-strongly-connected-components-algorithm/> It sounds like it's maybe not what you need, <@Kristy>, but FYI just in case it's useful to you.	2017-10-29T12:16:18.000067	Adelaida
clojurians	clojure	I'm not having much luck trying to write a pmap-like function that times-out after a specified number of milliseconds. I tried two implementations: one with futures and one with core.async. The more complicated futures one passes tests but doesn't stop processes when running in my project. The core.async one is even worse in that regard. I'm new to core.async. If you care to take a look, the code is here: <https://github.com/pdenno/utils4pmap/blob/master/src/pdenno/utils4pmap.clj> There are tests in utils4pmap_test.clj	2017-10-29T18:55:37.000110	Sherryl
clojurians	clojure	`(re-find #"[0-9]+(\.[0-9]*)?" "29482asdf")` this returns a vector [complete-match ... groups ... ] is there a way to have it just return the full-match, and not all the intermediate groups ? (I know that I can call first, but I'm trying to get an interface to re-find where it just returns compete string, instead of all groups)	2017-10-29T22:24:00.000119	Berry
clojurians	clojure	you can use non capturing groups, `(re-find #"[0-9]+(?:\.[0-9]*)?" "29482asdf")`	2017-10-29T22:32:46.000035	Jonas
clojurians	clojure	by adding the `?:` at the start of the group	2017-10-29T22:32:59.000031	Jonas
clojurians	clojure	<@Jonas>: that is much nicer than my current solution of: ``` (defn re-find0 [pat s] (let [ans (re-find pat s)] (if (vector? ans) (first ans) ans))) ```	2017-10-30T00:26:23.000076	Berry
clojurians	clojure	future-cancel is unreliable, if you want something to be cancellable you need to ensure it regularly calls some cancellable method (the list is relatively short) <https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html#cancel(boolean)>	2017-10-30T02:14:43.000032	Margaret
clojurians	clojure	<@Marla> <@Herminia> Around the time, you are visiting the meetup in prague on December, 6th, are you able to visit or speak on another meetup nearby?	2017-10-30T03:42:37.000168	Hermelinda
clojurians	clojure	How do you pass data from `clojure.test` fixtures to tests (e.g a db connection where you don't know the port at write time)?	2017-10-30T05:37:04.000278	Lesia
clojurians	clojure	how do I create a regex that only ma5ches +-/ `[+-/]` ==> invalid character range	2017-10-30T06:57:50.000199	Berry
clojurians	clojure	you need to escape the -	2017-10-30T06:58:57.000213	Weston
clojurians	clojure	oh, it's looking for a range of '+' to "*/" ?	2017-10-30T06:59:29.000454	Berry
clojurians	clojure	I can see that being an invalid range	2017-10-30T06:59:38.000288	Berry
clojurians	clojure	`#"[+\-*/]"` worked; thanks	2017-10-30T07:00:10.000276	Berry
clojurians	clojure	Guys Hi, Is there a problem with clojars? I can not download any dependencies, getting a protol version error?	2017-10-30T07:54:53.000061	Dane
clojurians	clojure	<@Berry>, I think alternatively you can move the dash to the end of the character group	2017-10-30T08:08:25.000039	Fe
clojurians	clojure	<@Dane> clojars is working for me. Can you gist the output you see?	2017-10-30T08:12:36.000414	Candi
clojurians	clojure	<@Candi> <https://gist.github.com/anonymous/4bd2d48f05502968313e8b0cdc656826> here is the output	2017-10-30T09:15:12.000132	Dane
clojurians	clojure	What is the output of `lein version`?	2017-10-30T09:16:38.000215	Candi
clojurians	clojure	Leiningen 2.8.1 on Java 1.7.0_51 Java HotSpot(TM) 64-Bit Server VM	2017-10-30T09:17:20.000362	Dane
clojurians	clojure	Did you just recently update lein? 2.8.0 changed the clojars url to point to the CDN instead of the server, and it's possible that old version of java doesn't have the proper TLS features to work with the CDN	2017-10-30T09:20:07.000133	Candi
clojurians	clojure	you definitely should update java	2017-10-30T09:21:06.000537	Cecilia
clojurians	clojure	1.7 reached it’s end of life ages ago	2017-10-30T09:21:19.000130	Cecilia
clojurians	clojure	yes i updated lein it 4-5 hours ago	2017-10-30T09:21:49.000412	Dane
clojurians	clojure	java 7 supports SNI which would be the most obvious reason for it to not work	2017-10-30T09:22:18.000194	Cecilia
clojurians	clojure	but then again, it might be the CDN is using very strict crypto algorithms for it’s TLS support which might not be supported by java 7	2017-10-30T09:22:56.000111	Cecilia
clojurians	clojure	I’m still with java 8, I haven’t updated to 9 because of clojure and lein	2017-10-30T09:23:20.000179	Geneva
clojurians	clojure	leiningen now works with java 9 with the latest update but one cannot say the same about all libraries	2017-10-30T09:23:43.000032	Cecilia
clojurians	clojure	It gives error on 9, at least it gave it to me, I don’t remember the error	2017-10-30T09:23:43.000083	Geneva
clojurians	clojure	and clojure 1.9-beta3 at least works with java 9	2017-10-30T09:24:00.000379	Cecilia
clojurians	clojure	i am now updating java then	2017-10-30T09:24:23.000097	Dane
clojurians	clojure	I saw some ppl saying to use clojure 1.9 with java 9, well, stable things should be with stable clojure for now (1.8)	2017-10-30T09:24:23.000461	Geneva
clojurians	clojure	We tested the CDN with the latest java 6 when we were setting it up, and it worked, but it's possible that was due to a patch release, and maybe there is a patch to java 7 that provides the same support	2017-10-30T09:24:26.000357	Candi
clojurians	clojure	<@Dane> stick with java 8 for now	2017-10-30T09:24:37.000090	Cecilia
clojurians	clojure	not everything is up to speed with java 9 which brought the module mechanism which is partly backwards incompatible	2017-10-30T09:24:59.000288	Cecilia
clojurians	clojure	(Clojure has always worked on Java 9, it was Lein and Boot that were late to the party. Both are fixed now)	2017-10-30T09:25:01.000461	Guillermo
clojurians	clojure	<@Guillermo> but clojure 1.8?	2017-10-30T09:25:21.000004	Geneva
clojurians	clojure	if you can't update java, you can add the following to your `:user` profile in `~/.lein/profiles.clj`: ``` :repositories [["clojars" {:url "<https://clojars.org/repo>"}]] :plugin-repositories [["clojars" {:url "<https://clojars.org/repo>"}]] ```	2017-10-30T09:25:30.000342	Candi
clojurians	clojure	Yup, that worked too <@Geneva>	2017-10-30T09:25:41.000137	Guillermo
clojurians	clojure	Hmm, I will try again with lein latest version	2017-10-30T09:26:01.000084	Geneva
clojurians	clojure	That will point you back at the server-based repo instead of the CDN	2017-10-30T09:26:26.000329	Candi
clojurians	clojure	which is what you were using before lein 2.8.0	2017-10-30T09:26:37.000215	Candi
clojurians	clojure	btw updating java solved the problem. Thanks all	2017-10-30T10:25:21.000220	Dane
clojurians	clojure	#lazyweb Has anyone here done performance comparisons of crypto from Java security providers (built-in or Bouncy Castle) vs. binding to a C library?	2017-10-30T12:36:28.000230	Guillermo
clojurians	clojure	I am working on a wrapper for a Java library (<https://github.com/ajoberstar/ike.cljj>) The library has a lot of varargs in it which can frequently be wrapped with clojure variadics. This requires a bit of arity overloading. The problem is that the original java has typed arguments in addition to differences in arity. What is the recommended way of dealing with this? Here is an example <https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#createTempDirectory(java.nio.file.Path,%20java.lang.String,%20java.nio.file.attribute.FileAttribute...)> I have three ideas: 1) in the implementation for the particular arity, check the type of the object dynamically. 2) treat it like a multimethod, let the dispatch function decide. 3) create separate function names for the wrapping function.	2017-10-30T12:38:55.000404	Fairy
clojurians	clojure	<@Fairy> a lot of the wrappers libs turn FileAttribute... into a set of keywords. I would not force varargs on the caller.	2017-10-30T12:46:08.000191	Guillermo
clojurians	clojure	I wouldn't mind if a library _only_ helped me create a set of FileAttributes. I have no issues with calling interop code directly. A lot of times it's clearer. `(Files/createTempDirectory p s (make-a-set-of-attrs))`	2017-10-30T12:49:39.000168	Guillermo
clojurians	clojure	<@Guillermo> I see your point. The ugly bit is the java-vararg, if that were simpler then the wrapper is not doing much.	2017-10-30T12:53:09.000291	Fairy
clojurians	clojure	Varargs in java are just syntactic, it's still fixed arity under the hood. The overloads for createTempDirectory are 2-arity and 3-arity, the clojure ones could be the same thing.	2017-10-30T12:57:07.000371	Guillermo
clojurians	clojure	<@Guillermo> I think the point here is that a java-varargs list of options such as FileAttribute is better treated in clojure as a collection, probably a hashmap. In that case the 2-arity can check if the second arg is a map and make the right call. Another way would be to provide a function for constructing the options array from a hashmap and using the java interop directly.	2017-10-30T13:10:51.000271	Fairy
clojurians	clojure	sounds good.	2017-10-30T13:11:17.000772	Guillermo
clojurians	clojure	hashmap or simple keyword set `#{:read :write}`, since the attrs are only boolean flags	2017-10-30T13:11:57.000311	Guillermo
clojurians	clojure	Hi, Clojure intermediate here. What is the best way to read big endian binary file?	2017-10-30T13:13:33.000156	Alice
clojurians	clojure	<@Alice> do you need to make something that parses the binary contents, does it suffice to just get the bytes in an array?	2017-10-30T13:19:42.000080	Margaret
clojurians	clojure	Yes.	2017-10-30T13:20:28.000068	Alice
clojurians	clojure	which one?	2017-10-30T13:20:40.000169	Margaret
clojurians	clojure	Sorry, what exactly do you mean?	2017-10-30T13:22:30.000707	Alice
clojurians	clojure	for bytes, java.io.FileInputStream will set you up, for more complex parsing, gloss is a good clojure option <https://github.com/ztellman/gloss>	2017-10-30T13:22:40.000076	Margaret
clojurians	clojure	I mean - if you need bytes, that’s much simpler. If you need to parse a specific format, there’s libraries that help	2017-10-30T13:22:56.000510	Margaret
clojurians	clojure	Oh, I just need bytes. This library would just be overkill.	2017-10-30T13:23:43.000779	Alice
clojurians	clojure	<@Alice> simple example ```Clojure 1.9.0-beta3 (ins)user=> (java.io.FileInputStream. "/etc/passwd") #object[java.io.FileInputStream 0x41709512 "java.io.FileInputStream@41709512"] (ins)user=> (def input 1) #'user/input (ins)user=> (.available input) 5253 (ins)user=> (def contents (byte-array 1)) #'user/contents (ins)user=> (.read input contents) 5253 (ins)user=> (into [] contents) [35 35 10 35 32 85 115 101 114 32 68 97 116 97 98 97 115 101 10 35 32 10 35 32 7 8 111 116 101 32 116 104 97 116 32 116 104 105 115 32 102 105 108 101 32 105 115 32 99 111 110 115 117 108 116 101 100 32 100 105 114 101 99 116 108 121 32 111 110 108 121 32 119 104 101 110 32 116 104 101 32 115 121 115 116 101 109 32 105 115 32 114 117 110 110 ... ]```	2017-10-30T13:25:41.000188	Margaret
clojurians	clojure	<@Alice> one gotcha with java in general is bytes are always signed, but there’s simple bitwise math tricks that allow all the operations you would expect despite the signedness	2017-10-30T13:26:38.000212	Margaret
clojurians	clojure	Thank you very much. I just found `with-open` and `input-stream` functions. Does they do the same job?	2017-10-30T13:28:03.000325	Alice
clojurians	clojure	input-stream doesn’t help much there since FileInputStream just gives you the thing - but with-open does help if you want to have it automatically close when exiting a specific scope	2017-10-30T13:28:44.000513	Margaret
clojurians	clojure	FileInputStream is already an InputStream - though I guess you can use input-stream if you want a BufferedInputStream instead?	2017-10-30T13:30:13.000649	Margaret
clojurians	clojure	Yep, I'll work with big files, so BufferedInputStream is probably a better choice. Anyway, I think I've got it. Thanks again.	2017-10-30T13:32:48.000425	Alice
clojurians	clojure	I don’t think that’s what the buffer on BufferedInputStream is about at all	2017-10-30T13:33:11.000646	Margaret
clojurians	clojure	it adds mark and reset support for streams that don’t implement those methods, but FileInputStream already gives you those methods	2017-10-30T13:33:36.000291	Margaret
clojurians	clojure	it’s not a file buffer for performance, it’s a software buffer for replay	2017-10-30T13:33:54.000203	Margaret
clojurians	clojure	if file usage needs to be optimized, there are things in java.nio for mmaping where supported	2017-10-30T13:34:41.000108	Margaret
clojurians	clojure	Would someone know why the following works in Java: ``` KafkaMetricsReporter$.MODULE$.startReporters(new VerifiableProperties(props)) ``` But cannot seem to reach `$.MODULE$.startReporters` from Clojure? (from <https://stackoverflow.com/a/47012396/1327651> )	2017-10-30T13:53:56.000732	Jonnie
clojurians	clojure	$ is part of the name, it’s not it’s own thing	2017-10-30T13:55:36.000545	Margaret
clojurians	clojure	it would be `(-> KafkaMetricsReporter$ (.MODULE$) (.startReporters (VerifiableProperties. props)))`	2017-10-30T13:56:42.000451	Margaret
clojurians	clojure	Anyone know if there's an already built solution to logging slow tests with leiningen? (i.e. when running `lein test`, if a `deftest` block takes longer than some specified (or assumed) amount of time, it prints a warning)?	2017-10-30T14:04:35.000780	Raul

clojurians

clojure

I'd just use Java for that.

2017-10-28T21:39:36.000060

Bibi

clojurians

clojure

Yea, that makes sense.

2017-10-28T21:40:15.000016

Araceli

clojurians

clojure

yeah - particularly because of the issues with boxed numerics, it's just easier to write a bit of java once you know which code has to be that fast

2017-10-28T21:40:34.000009

Margaret

clojurians

clojure

<@Margaret> True. Although, it seems like (from what I can tell from <http://insideclojure.org/2014/12/15/warn-on-boxed/>), unboxed math is possible in Clojure.

2017-10-28T21:41:45.000048

Araceli

clojurians

clojure

it's possible, it's a pain to get right

2017-10-28T21:43:17.000022

Margaret

clojurians

clojure

<@Bibi> <@Jonas> <@Margaret> Well, thank you for your responses. I think I should go reconsider what I am doing and why, as it sounds like I may be entering "when all you have is a hammer" territory.

2017-10-28T21:43:23.000001

Araceli

clojurians

clojure

I think one of the nice things for clojure is that if you do want to use some of the great work in the jvm ecosystem, you can use it as needed

2017-10-28T21:44:06.000100

Jonas

clojurians

clojure

So, I just went to look at the Benchmarks Game to see how they micro-optimized algorithms in Clojure. Unfortunately, it looks like, at some point recently, they removed Clojure from their languages list.

2017-10-28T21:47:42.000084

Araceli

clojurians

clojure

Wat?

2017-10-28T22:54:01.000049

Sonny

clojurians

clojure

Looks like it was removed from the web site on sept 20th, along with scala?

2017-10-28T23:10:09.000033

Sonny

clojurians

clojure

32-bit core is available <http://benchmarksgame.alioth.debian.org/u32/>

2017-10-28T23:32:05.000045

Lovie

clojurians

clojure

<@Lovie> Looks like that one's full of dead links, unfortunately. I can click into the language pages, but not the implementation source code pages. It just returns 404 Not Found.

2017-10-28T23:51:48.000046

Araceli

clojurians

clojure

2016 clojure removed? Guess we'll have to wait until 2032... "abandoned in 2002...restarted in 2004...continued from 2008...Everything has changed; several times." <https://benchmarksgame.alioth.debian.org/sometimes-people-just-make-up-stuff.html>

2017-10-29T02:24:42.000026

Lovie

clojurians

clojure

anyone know a handy way to detect circular dependencies in graphs?

2017-10-29T05:03:15.000064

Kristy

clojurians

clojure

I took a look at ubergraph and loom, no luck

2017-10-29T05:03:39.000001

Kristy

clojurians

clojure

<https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm>

2017-10-29T05:05:53.000045

Hedwig

clojurians

clojure

should be translated to clojure very quickly

2017-10-29T05:06:03.000024

Hedwig

clojurians

clojure

can eventually try out, thanks! meanwhile checking if I can steal something off `stuartsierra/component `

2017-10-29T05:06:45.000043

Kristy

clojurians

clojure

<https://github.com/stuartsierra/dependency/blob/master/src/com/stuartsierra/dependency.cljc#L89>

2017-10-29T05:11:43.000056

Kristy

clojurians

clojure

@vemv isn't <http://aysy.lu/loom/loom.alg.html#var-dag.3F> what you need ?

2017-10-29T05:28:20.000038

Rosia

clojurians

clojure

guess so! `(def has-circular-dependencies? (complement dag?))` ?

2017-10-29T05:48:35.000005

Kristy

clojurians

clojure

yes, a dag has no cycle by definition

2017-10-29T06:04:42.000022

Rosia

clojurians

clojure

this function won't give you the culprit however

2017-10-29T06:06:02.000024

Rosia

clojurians

clojure

Does anyone know how to add accents or diacritical marks to characters? As in add ¨ to a to make ä?

2017-10-29T06:08:06.000049

Jermaine

clojurians

clojure

Found that you can do "e\u0305".

2017-10-29T06:23:56.000080

Jermaine

clojurians

clojure

<https://github.com/funcool/clojure.jdbc> Comparing to *java.jdbc* I like clearer docs and simpler API, especially that there's a difference between connections/dbspecs and how transactions are implemented. Other advantages are pointed out in the FAQ: <http://funcool.github.io/clojure.jdbc/latest/#why-another-jdbc-wrapper>

2017-10-29T07:59:36.000001

Adele

clojurians

clojure

By chance I happened across this yesterday: <http://clj-me.cgrand.net/2013/03/18/tarjans-strongly-connected-components-algorithm/> It sounds like it's maybe not what you need, <@Kristy>, but FYI just in case it's useful to you.

2017-10-29T12:16:18.000067

Adelaida

clojurians

clojure

I'm not having much luck trying to write a pmap-like function that times-out after a specified number of milliseconds. I tried two implementations: one with futures and one with core.async. The more complicated futures one passes tests but doesn't stop processes when running in my project. The core.async one is even worse in that regard. I'm new to core.async. If you care to take a look, the code is here: <https://github.com/pdenno/utils4pmap/blob/master/src/pdenno/utils4pmap.clj> There are tests in utils4pmap_test.clj

2017-10-29T18:55:37.000110

Sherryl

clojurians

clojure

`(re-find #"[0-9]+(\.[0-9]*)?" "29482asdf")` this returns a vector [complete-match ... groups ... ] is there a way to have it just return the full-match, and not all the intermediate groups ? (I know that I can call first, but I'm trying to get an interface to re-find where it just returns compete string, instead of all groups)

2017-10-29T22:24:00.000119

Berry

clojurians

clojure

you can use non capturing groups, `(re-find #"[0-9]+(?:\.[0-9]*)?" "29482asdf")`

2017-10-29T22:32:46.000035

Jonas

clojurians

clojure

by adding the `?:` at the start of the group

2017-10-29T22:32:59.000031

Jonas

clojurians

clojure

<@Jonas>: that is much nicer than my current solution of: ``` (defn re-find0 [pat s] (let [ans (re-find pat s)] (if (vector? ans) (first ans) ans))) ```

2017-10-30T00:26:23.000076

Berry

clojurians

clojure

future-cancel is unreliable, if you want something to be cancellable you need to ensure it regularly calls some cancellable method (the list is relatively short) <https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html#cancel(boolean)>

2017-10-30T02:14:43.000032

Margaret

clojurians

clojure

<@Marla> <@Herminia> Around the time, you are visiting the meetup in prague on December, 6th, are you able to visit or speak on another meetup nearby?

2017-10-30T03:42:37.000168

Hermelinda

clojurians

clojure

How do you pass data from `clojure.test` fixtures to tests (e.g a db connection where you don't know the port at write time)?

2017-10-30T05:37:04.000278

Lesia

clojurians

clojure

how do I create a regex that only ma5ches +-*/ `[+-*/]` ==> invalid character range

2017-10-30T06:57:50.000199

Berry

clojurians

clojure

you need to escape the -

2017-10-30T06:58:57.000213

Weston

clojurians

clojure

oh, it's looking for a range of '+' to "*/" ?

2017-10-30T06:59:29.000454

Berry

clojurians

clojure

I can see that being an invalid range

2017-10-30T06:59:38.000288

Berry

clojurians

clojure

`#"[+\-*/]"` worked; thanks

2017-10-30T07:00:10.000276

Berry

clojurians

clojure

Guys Hi, Is there a problem with clojars? I can not download any dependencies, getting a protol version error?

2017-10-30T07:54:53.000061

Dane

clojurians

clojure

<@Berry>, I think alternatively you can move the dash to the end of the character group

2017-10-30T08:08:25.000039

Fe

clojurians

clojure

<@Dane> clojars is working for me. Can you gist the output you see?

2017-10-30T08:12:36.000414

Candi

clojurians

clojure

<@Candi> <https://gist.github.com/anonymous/4bd2d48f05502968313e8b0cdc656826> here is the output

2017-10-30T09:15:12.000132

Dane

clojurians

clojure

What is the output of `lein version`?

2017-10-30T09:16:38.000215

Candi

clojurians

clojure

Leiningen 2.8.1 on Java 1.7.0_51 Java HotSpot(TM) 64-Bit Server VM

2017-10-30T09:17:20.000362

Dane

clojurians

clojure

Did you just recently update lein? 2.8.0 changed the clojars url to point to the CDN instead of the server, and it's possible that old version of java doesn't have the proper TLS features to work with the CDN

2017-10-30T09:20:07.000133

Candi

clojurians

clojure

you definitely should update java

2017-10-30T09:21:06.000537

Cecilia

clojurians

clojure

1.7 reached it’s end of life ages ago

2017-10-30T09:21:19.000130

Cecilia

clojurians

clojure

yes i updated lein it 4-5 hours ago

2017-10-30T09:21:49.000412

Dane

clojurians

clojure

java 7 supports SNI which would be the most obvious reason for it to not work

2017-10-30T09:22:18.000194

Cecilia

clojurians

clojure

but then again, it might be the CDN is using very strict crypto algorithms for it’s TLS support which might not be supported by java 7

2017-10-30T09:22:56.000111

Cecilia

clojurians

clojure

I’m still with java 8, I haven’t updated to 9 because of clojure and lein

2017-10-30T09:23:20.000179

Geneva

clojurians

clojure

leiningen now works with java 9 with the latest update but one cannot say the same about all libraries

2017-10-30T09:23:43.000032

Cecilia

clojurians

clojure

It gives error on 9, at least it gave it to me, I don’t remember the error

2017-10-30T09:23:43.000083

Geneva

clojurians

clojure

and clojure 1.9-beta3 at least works with java 9

2017-10-30T09:24:00.000379

Cecilia

clojurians

clojure

i am now updating java then

2017-10-30T09:24:23.000097

Dane

clojurians

clojure

I saw some ppl saying to use clojure 1.9 with java 9, well, stable things should be with stable clojure for now (1.8)

2017-10-30T09:24:23.000461

Geneva

clojurians

clojure

We tested the CDN with the latest java 6 when we were setting it up, and it worked, but it's possible that was due to a patch release, and maybe there is a patch to java 7 that provides the same support

2017-10-30T09:24:26.000357

Candi

clojurians

clojure

<@Dane> stick with java 8 for now

2017-10-30T09:24:37.000090

Cecilia

clojurians

clojure

not everything is up to speed with java 9 which brought the module mechanism which is partly backwards incompatible

2017-10-30T09:24:59.000288

Cecilia

clojurians

clojure

(Clojure has always worked on Java 9, it was Lein and Boot that were late to the party. Both are fixed now)

2017-10-30T09:25:01.000461

Guillermo

clojurians

clojure

<@Guillermo> but clojure 1.8?

2017-10-30T09:25:21.000004

Geneva

clojurians

clojure

if you can't update java, you can add the following to your `:user` profile in `~/.lein/profiles.clj`: ``` :repositories [["clojars" {:url "<https://clojars.org/repo>"}]] :plugin-repositories [["clojars" {:url "<https://clojars.org/repo>"}]] ```

2017-10-30T09:25:30.000342

Candi

clojurians

clojure

Yup, that worked too <@Geneva>

2017-10-30T09:25:41.000137

Guillermo

clojurians

clojure

Hmm, I will try again with lein latest version

2017-10-30T09:26:01.000084

Geneva

clojurians

clojure

That will point you back at the server-based repo instead of the CDN

2017-10-30T09:26:26.000329

Candi

clojurians

clojure

which is what you were using before lein 2.8.0

2017-10-30T09:26:37.000215

Candi

clojurians

clojure

btw updating java solved the problem. Thanks all

2017-10-30T10:25:21.000220

Dane

clojurians

clojure

#lazyweb Has anyone here done performance comparisons of crypto from Java security providers (built-in or Bouncy Castle) vs. binding to a C library?

2017-10-30T12:36:28.000230

Guillermo

clojurians

clojure

I am working on a wrapper for a Java library (<https://github.com/ajoberstar/ike.cljj>) The library has a lot of varargs in it which can frequently be wrapped with clojure variadics. This requires a bit of arity overloading. The problem is that the original java has typed arguments in addition to differences in arity. What is the recommended way of dealing with this? Here is an example <https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#createTempDirectory(java.nio.file.Path,%20java.lang.String,%20java.nio.file.attribute.FileAttribute...)> I have three ideas: 1) in the implementation for the particular arity, check the type of the object dynamically. 2) treat it like a multimethod, let the dispatch function decide. 3) create separate function names for the wrapping function.

2017-10-30T12:38:55.000404

Fairy

clojurians

clojure

<@Fairy> a lot of the wrappers libs turn FileAttribute... into a set of keywords. I would not force varargs on the caller.

2017-10-30T12:46:08.000191

Guillermo

clojurians

clojure

I wouldn't mind if a library _only_ helped me create a set of FileAttributes. I have no issues with calling interop code directly. A lot of times it's clearer. `(Files/createTempDirectory p s (make-a-set-of-attrs))`

2017-10-30T12:49:39.000168

Guillermo

clojurians

clojure

<@Guillermo> I see your point. The ugly bit is the java-vararg, if that were simpler then the wrapper is not doing much.

2017-10-30T12:53:09.000291

Fairy

clojurians

clojure

Varargs in java are just syntactic, it's still fixed arity under the hood. The overloads for createTempDirectory are 2-arity and 3-arity, the clojure ones could be the same thing.

2017-10-30T12:57:07.000371

Guillermo

clojurians

clojure

<@Guillermo> I think the point here is that a java-varargs list of options such as FileAttribute is better treated in clojure as a collection, probably a hashmap. In that case the 2-arity can check if the second arg is a map and make the right call. Another way would be to provide a function for constructing the options array from a hashmap and using the java interop directly.

2017-10-30T13:10:51.000271

Fairy

clojurians

clojure

sounds good.

2017-10-30T13:11:17.000772

Guillermo

clojurians

clojure

hashmap or simple keyword set `#{:read :write}`, since the attrs are only boolean flags

2017-10-30T13:11:57.000311

Guillermo

clojurians

clojure

Hi, Clojure intermediate here. What is the best way to read big endian binary file?

2017-10-30T13:13:33.000156

Alice

clojurians

clojure

<@Alice> do you need to make something that parses the binary contents, does it suffice to just get the bytes in an array?

2017-10-30T13:19:42.000080

Margaret

clojurians

clojure

Yes.

2017-10-30T13:20:28.000068

Alice

clojurians

clojure

which one?

2017-10-30T13:20:40.000169

Margaret

clojurians

clojure

Sorry, what exactly do you mean?

2017-10-30T13:22:30.000707

Alice

clojurians

clojure

for bytes, java.io.FileInputStream will set you up, for more complex parsing, gloss is a good clojure option <https://github.com/ztellman/gloss>

2017-10-30T13:22:40.000076

Margaret

clojurians

clojure

I mean - if you need bytes, that’s much simpler. If you need to parse a specific format, there’s libraries that help

2017-10-30T13:22:56.000510

Margaret

clojurians

clojure

Oh, I just need bytes. This library would just be overkill.

2017-10-30T13:23:43.000779

Alice

clojurians

clojure

<@Alice> simple example ```Clojure 1.9.0-beta3 (ins)user=> (java.io.FileInputStream. "/etc/passwd") #object[java.io.FileInputStream 0x41709512 "java.io.FileInputStream@41709512"] (ins)user=> (def input *1) #'user/input (ins)user=> (.available input) 5253 (ins)user=> (def contents (byte-array *1)) #'user/contents (ins)user=> (.read input contents) 5253 (ins)user=> (into [] contents) [35 35 10 35 32 85 115 101 114 32 68 97 116 97 98 97 115 101 10 35 32 10 35 32 7 8 111 116 101 32 116 104 97 116 32 116 104 105 115 32 102 105 108 101 32 105 115 32 99 111 110 115 117 108 116 101 100 32 100 105 114 101 99 116 108 121 32 111 110 108 121 32 119 104 101 110 32 116 104 101 32 115 121 115 116 101 109 32 105 115 32 114 117 110 110 ... ]```

2017-10-30T13:25:41.000188

Margaret

clojurians

clojure

<@Alice> one gotcha with java in general is bytes are always signed, but there’s simple bitwise math tricks that allow all the operations you would expect despite the signedness

2017-10-30T13:26:38.000212

Margaret

clojurians

clojure

Thank you very much. I just found `with-open` and `input-stream` functions. Does they do the same job?

2017-10-30T13:28:03.000325

Alice

clojurians

clojure

input-stream doesn’t help much there since FileInputStream just gives you the thing - but with-open does help if you want to have it automatically close when exiting a specific scope

2017-10-30T13:28:44.000513

Margaret

clojurians

clojure

FileInputStream is already an InputStream - though I guess you can use input-stream if you want a BufferedInputStream instead?

2017-10-30T13:30:13.000649

Margaret

clojurians

clojure

Yep, I'll work with big files, so BufferedInputStream is probably a better choice. Anyway, I think I've got it. Thanks again.

2017-10-30T13:32:48.000425

Alice

clojurians

clojure

I don’t think that’s what the buffer on BufferedInputStream is about at all

2017-10-30T13:33:11.000646

Margaret

clojurians

clojure

it adds mark and reset support for streams that don’t implement those methods, but FileInputStream already gives you those methods

2017-10-30T13:33:36.000291

Margaret

clojurians

clojure

it’s not a file buffer for performance, it’s a software buffer for replay

2017-10-30T13:33:54.000203

Margaret

clojurians

clojure

if file usage needs to be optimized, there are things in java.nio for mmaping where supported

2017-10-30T13:34:41.000108

Margaret

clojurians

clojure

Would someone know why the following works in Java: ``` KafkaMetricsReporter$.MODULE$.startReporters(new VerifiableProperties(props)) ``` But cannot seem to reach `$.MODULE$.startReporters` from Clojure? (from <https://stackoverflow.com/a/47012396/1327651> )

2017-10-30T13:53:56.000732

Jonnie

clojurians

clojure

$ is part of the name, it’s not it’s own thing

2017-10-30T13:55:36.000545

Margaret

clojurians

clojure

it would be `(-> KafkaMetricsReporter$ (.MODULE$) (.startReporters (VerifiableProperties. props)))`

2017-10-30T13:56:42.000451

Margaret

clojurians

clojure

Anyone know if there's an already built solution to logging slow tests with leiningen? (i.e. when running `lein test`, if a `deftest` block takes longer than some specified (or assumed) amount of time, it prints a warning)?

2017-10-30T14:04:35.000780

Raul