#clojure – 2013-04-08

2013-04-08

00:10	murtaza52	I have a sorted map that I am sending to the client. The client is in cljs, the hash-map that appears on the client is not sorted, any ideas?
00:11	nightfly	I don't think javascript has a native notion of a sorted map
00:14	murtaza52	so the sort order wont me maintained, I mean I am not manipulating the collection on the client
00:14	murtaza52	I am displaying it as is
00:14	pbostrom	murtaza52: you are sending as edn?
00:14	murtaza52	nope
00:14	murtaza52	I am using shoreleave which uses fetch
00:15	pbostrom	in any case, you'll probably have to explicitly call sorted-map
00:16	murtaza52	call sorted-map on the client ?
00:17	pbostrom	yeah
00:17	murtaza52	the problem is that sorting is being done based on the date, which is using clj-time, which uses java's joda time. So I wont have this dependency avalaible in cljs
00:19	pbostrom	hmm, maybe convert the map to a vector of map entries instead
00:19	murtaza52	any way around it?
00:19	pbostrom	before sending to the client
00:19	pbostrom	that will stay in order at least
00:21	murtaza52	thanks pbostrom, let me try that. The reason it will maintain the order, is because arrays are ordered by index ?
00:26	pbostrom	yes, your sorted map is probably getting converted to a normal map for serializing over the wire via fetch, it seems like there would be a way to maintain the sorted map using the edn reader, but I don't know enough about it
00:27	andyfingerhut	I'm pretty sure edn has no notion of order for sets or maps.
00:27	andyfingerhut	vectors or lists would be the way to go if you want to preserve order.
00:29	andyfingerhut	Here's an excerpt from the edn spec regarding sets: "No semantics should be associated with the order in which the elements appear." It says the same for maps.
00:30	andyfingerhut	Hmmm. I think I'll suggest to Bronsa that he mention this somewhere in the tools.reader docs for that edn reader.
00:30	pbostrom	there you go
01:44	ebaxt	Are there any good reasons for not having a regex? predicate in Clojure?
01:51	andyfingerhut	One could potentially argue that there are plenty of similar things that could be added. Where would you draw the line?
01:51	andyfingerhut	e.g. array? uuid? file?
01:51	andyfingerhut	(instance java.util.regex.Pattern x) should do what you need, yes?
01:52	andyfingerhut	er, that should have been instance? with a ?
01:53	ebaxt	andyfingerhut: fair point
05:10	NobitaZ	hii
17:35	zaphyr	oh. i see. so i have to :require-macros or such in every cljs ns i want to use them in, there's no way to make them export?
17:36	gfredericks	that's how clojure generally works; explicitely requiring things
17:37	zaphyr	yes, but in clojure I can import macros along with other definitions in the same :require, whereas in clojurescript macros are imported with a different :require-form, you can't just (:require foo :as bar), but you also have to (:require-macros foo :as bar)
17:38	gfredericks	yep
17:38	zaphyr	ouch
17:38	gfredericks	the compiler has to know whether something is a macro or not
17:38	gfredericks	it's definitely not ideal
17:38	zaphyr	sure, but clojurescript is entirely AOT isn't it? so in theory you could do that
17:38	zaphyr	okay it would break brepl
17:39	dnolen	zaphyr: macros are written in Clojure, require is for runtime dependencies. I don't see how it could be made to work.
17:39	dnolen	or I could imagine it, and it sounds yucky.
17:40	zaphyr	hey, it's not r6rs staged macro horror :)
17:41	zaphyr	but- can't you track imports, at least via ns, at compile time, then fully macro-expand the source then? (in theory)
17:41	Okasu	Guys, what do you usually use when it comes to realtional db and clojure? Clojure jdbc lack of abstraction disturbing(yeah, i can abstract things away by myself but is there something already done in this field?).
17:42	dnolen	zaphyr: CLJS compilation unit is a function, just like Clojure.
17:43	zaphyr	dnolen: ah.
17:44	dnolen	zaphyr: I take it you do a bit of Scheme? :)
17:45	zaphyr	a bit of all sorts of lisps. but implementing scheme macros is... oh.. dear lord.
07:48	ggbothso	Hi all, is there a way to automatically run the tests every time a filesystem change is detected?
07:49	ggbothso	in scala, using sbt, I can do it with: "~ test"
07:50	babilen	ggbothso: midje supports that (autotest), no idea if there is anything like that for clojure.test
07:51	babilen	ggbothso: there was lein-autotest, but that hasn't been maintained (along with lazytest) in quite a while
07:54	babilen	ggbothso: midje /can/ run clojure.test tests as well (cf. https://github.com/marick/Midje/wiki/A-tutorial-introduction-for-Clojure.test-users) but you might want to take a look at the Testing section on https://github.com/technomancy/leiningen/wiki/Plugins
11:39	mpenet	unless you are thinking about something I am missing
11:44	mpenet	the problem with clojure.core promise is that they are way too simple, it's sometimes good, but often it's not enough. The callback issue is one but exception handling is another important issue (deref can't throw), well the fact that there is only 1 type of result really.
11:47	CookedGryphon	hugod: I've tried disabling eldoc and autocomplete-mode in my nrepl buffer, but I'm still having issues with the repl hanging after I clear an exception window. Any ideas?
11:48	CookedGryphon	I am at least past the point where emacs would just completely freeze
11:49	CookedGryphon	also, all the locals in one of the exceptions I caught appear to be nil, is that something other people have come across?
11:54	alexnixon	Coo--- File clojure/2013-04-10.log
17:08	tbaldrid_	these are reader issues, legal symbols can be anything.
20:10	neilmarcus	hello?
20:10	clojurebot	BUENOS DING DONG DIDDLY DIOS, fRaUline neilmarcus
20:25	ravster	whats the max that java.lang.Integer can go to? I'm trying to use the java.awt.Polygon class to find if a given latitude and longitude is part of a polygon, and I'm not sure by how many decimal places I can move a value (Egs: latitude 44.35745968346 -> 4435745968346 )
20:26	hiredman	,Interger/MAX_VALUE
20:26	clojurebot	#<CompilerException java.lang.RuntimeException: No such namespace: Interger, compiling:(NO_SOURCE_PATH:0:0)>
20:26	hiredman	,Integer/MAX_VALUE
20:26	clojurebot	2147483647
20:26	hiredman	,Integer/MIN_VALUE
20:26	clojurebot	-2147483648
20:26	hiredman	,Long/MAX_VALUE
20:26	clojurebot	9223372036854775807
20:26	hiredman	,Long/MIN_VALUE
20:26	clojurebot	-9223372036854775808
20:27	ravster	hiredman: oh, I wish I could use longs. But the Polygon class doesn't seem able to consume them.
20:27	ravster	hiredman: and thanks for the answer. :)
20:38	noprompt	when using require is it possible to both refer and rename?
20:40	noprompt	or is it ok to use use in that case?
20:42	noprompt	oh, there it is.
20:46	bttf	brand new to clj ... just wrote some code in my core.clj, trying to run it in my 'lein repl' ... i do (in-ns 'testing-clj.core) to get into the namespace but it seems not able to see my symbols
20:49	bttf	https://gist.github.com/bttf/776f7389cd96b4743dd7
20:51	bttf	it seems that i'm entering that namespace but completely separate from what i have defined in src/testing_clj/core.clj
20:53	ivan	does it work without (:gen-class)? are you sure you're doing (in-ns 'testing-clj.core) and not (in-ns 'testing_clj.core)?
20:54	ivan	`hello` shouldn't even compile because `hi` is defined after it, though I don't know how AOT works with that
20:54	bttf	ivan: thanks for replying, i have since removed (:gen-class) since i am not using it ... when I do lein compile i get no output whatsoever .. i don't even know if lein see's the file
20:55	bttf	i mean, i just generated a new project ,wrote the code and did a 'lein compile'
20:55	ivan	you don't need to lein compile before lein repl
20:56	bttf	ok
20:57	bttf	and yes i'm sure i am doing (in-ns 'testing-clj.core)
20:58	bttf	i've rearranged the functions, same issue
21:00	ivan	bttf: I'm probably missing something obvious, it's not working here either
21:01	bttf	ok ... does somehing need to be specified in the project.clj ? id assume that it should be set to go
21:03	ivan	bttf: maybe it's because your directory starts with "test"
21:04	ivan	lein might be ignoring those by default
21:04	bttf	weird, let me try
21:04	ivan	make sure you change the (ns too
21:06	ivan	bttf: heh, actually you need to (require 'testing-clj.core) first
21:06	ivan	(in-ns) does not seem to load things
21:06	dakrone	amalloy_: cool, will look when I can
21:07	bttf	ivan: ahh that works, thank you
21:09	mdeboard	brehaut: re: named groups https://gist.github.com/mattdeboard/5359853
21:10	mdeboard	I find it hard to believe this doesn't exist already
21:11	ivan	bttf: you can put :main testing-clj.core in project.clj to load and enter that namespace
21:13	bttf	ah cool thanks
21:14	jhawk28	can anyone give be some suggestions on creating a DSL?
21:14	jhawk28	I want to create a subset of the language that is mainly arithmetic/boolean with some specific functions
21:15	jhawk28	but I need to to be limited since the code is "dynamic" and can potentially be unsafe
21:16	jhawk28	is there a way to remove all functions from the dsl's namespace and only add in the specific ones I want?
21:16	jhawk28	or do I need to just read in the data as ebn and then execute it myself
21:17	ivan	I think I would use edn and a whitelist
21:17	mthvedt	jhawk28: you want to read in untrusted data that's a subset of clojure?
21:17	nightfly	clojail might be useful
21:17	jhawk28	yes, a subset
21:18	bttf	ivan: what about reloading a file in the repl? i'm trying (load-file) but its not cooperatng
21:19	mthvedt	you could walk the tree and throw out anything not on the whitelist
21:19	ivan	bttf: probably (require 'testing-clj.core :reload)
21:19	mthvedt	after reading it in as edn
21:19	ivan	there's also a :reload-all
21:20	ivan	also nrepl.el has many conveniences for sending new forms to the repl
21:20	bttf	nice, it works
21:21	bttf	ill check out nrepl.el
21:22	bttf	there isn't a vim equivalent is there? ;)
21:22	brehaut	mdeboard: cool; pity you have to double handle the group names :/
21:22	mdeboard	Yeah. Either that or uh
21:22	mdeboard	parse the patterns :P
21:22	mdeboard	nothx
21:22	jhawk28	thanks, I think the edn or the clojail may work
21:22	brehaut	（╯°□°）╯︵ ┻━┻
21:22	mdeboard	brehaut: I'm sure there's a much better way of handling that
21:22	mdeboard	┬──┬◡ﾉ(° -°ﾉ) chill out bro
21:22	mdeboard	dat emacs macro
21:23	ivan	bttf: I hear people use https://github.com/tpope/vim-fireplace
21:23	mdeboard	never got to use it in the wild before
21:23	brehaut	ha
21:23	bttf	brehaut: are you flipping tables
21:23	brehaut	yes
21:23	bttf	awesome
21:23	brehaut	regexps bring out the worst in me
21:29	brehaut	,(re-pattern (str #"\w" #"\d")) ; mdeboard
21:29	clojurebot	#"\w\d"
21:29	brehaut	mdeboard: that'll save you having to escape all your slashes in your regexps
21:36	mdeboard	brehaut: Oh, didn't think that works, using the regex reader
21:37	mdeboard	as args to str
21:37	brehaut	mdeboard: str takes anything that has a toString method (ie, everything)
21:38	brehaut	regex patterns happen to have a very useful toString
21:38	brehaut	its perhaps not immediately obvious though; i learnt the trick from weavejester
21:42	mdeboard	brehaut: Cool, thanks for the pointer
21:56	mikepence	reading the joy of closure
21:56	mikepence	<3 new stuff
22:05	bttf	anyone good with vim-fireplace in here ?
22:07	TimMc	Almost certainly. If you have a question, ask and find out!
22:10	joegallo	that was the question, he was just checkin' ;)
22:11	bttf	well, i'm moving my cursor to a namespace and trying 'gf' .. it's complaining about several things, the first one is that its unable to resolve a symbol that i've not implemented yet (this is the test)
22:11	bttf	and when i try :Eval ( ... ), whatever i try it gives me the same complaint of unable to resolve symbol
22:12	tpope	is your file requirable?
22:15	bttf	tpope: my apologies, the hopping stops here
22:16	bttf	in the repl i can require the file no problem
22:16	bttf	is there a fireplace command for require
22:17	tpope	there is, :Require
22:17	tpope	it also implicitly requires the current namespace if it's your first time evaluating code in it
22:18	tpope	which I assumed was what was failing, albeit with a pecular sounding error
22:18	tpope	can you refheap the error?
22:18	tpope	use :messages to see it again
22:19	bttf	i don't see the 'unable to resolve symbol' errors in messages
22:19	bttf	but i do see the others, dealing with 'Error detected while processing function <SNR>36_GF..fireplace#findfile..<SNR>36_eval'
22:20	tpope	what are you pressing gf on?
22:20	bttf	https://gist.github.com/bttf/808d402bea36784c1eb4
22:21	bttf	https://gist.github.com/bttf/4db2ea0d2bf7d3a31dbc line 3 is what i'm gf-ing
22:23	tpope	https://github.com/tpope/vim-fireplace/issues/44#issuecomment-16054922
22:23	tpope	is that your alterego? same error right down to the example
22:24	tpope	oh, because it's from the tutorial, herp derp
22:24	bttf	nope and yes, the tut
22:25	tpope	bttf: to be clear, you can require the test file, correct?
22:26	bttf	(clojure.core/require 'command-line-args.core-test :reload)
22:26	bttf	CompilerException java.lang.RuntimeException: Unable to resolve symbol: parse-args in this context, compiling:(command_line_args/c
22:26	bttf	nope
22:26	tpope	well, that's the root of the problem
22:26	tpope	the error is messier than it should be
22:27	bttf	messier or misleading?
22:27	tpope	it says couldn't require command-line-args.core-test plain is day
22:28	tpope	it's just surrounded by 5 lines of vim garbage
22:28	bttf	oh i see
22:29	bttf	but when I require the test, i only get the error i pasted just above
22:29	bttf	unless the other erros are hidden away somewhere
22:29	tpope	well it's one level of abstraction up. requiring the file tells you what went wrong. doing something that implicitly requires the file tells you the file couldn't be required
22:30	tpope	I just reproduced it. there's another error that happens at the top that tells you exactly what you're looking for
22:30	mthvedt	is there a macro that's like memoize, but for an inline chunk of code
22:31	mthvedt	to execute it exactly once
22:34	amalloy	mthvedt: delay
22:35	tpope	bttf: I just cleaned up the error on gf and ]d. let me know if you find others
22:35	bttf	alright, ill give it a try
22:36	mthvedt	amalloy: delay returns an object that can be derefed, i want to skip that intermediate step
22:36	amalloy	mthvedt: in that case, all code always, is executed exactly once :P
22:37	mthvedt	it would have made this one thing i'm writing more readable… but never mind
22:41	bttf	tpope: looks good so far
22:42	bttf	but cpR isn't doing anything for me.
22:42	bttf	and i've deleted my function definition from the code and the test isn't giving me the unresolved symbol error that it should, i believe
22:43	tpope	well it only requires once
22:43	tpope	after that it's up to you to reload
22:44	bttf	and cpr reloads, no ?
22:46	bttf	cpR should reload-all, but i don't see it happening. if i do cpr on each file, i dont see any errors
22:46	tpope	cemerick made me take away cpR :(
22:47	bttf	ooh
22:47	tpope	you can :Require! to reload-all
22:47	bttf	ok
22:47	bttf	still no dice
22:49	tpope	well try :Eval (require ... :reload-all)
22:49	tpope	that's all :Require! is doing
22:50	bttf	i did :Eval (require 'command-line-args.core) :reload-all
22:50	bttf	then I did, :Eval (clojure.test/run-tests)
22:51	bttf	and im seeing errors from when my function existed
22:51	tpope	re-requiring a file doesn't delete the old namespace first
22:52	tpope	you can ns-unmap, or just restart your repl
22:52	bttf	interesting
22:52	bttf	but if i make changes to my source, shouldnt it automatically update namespace?
22:53	bttf	maybe im missing something here
22:53	tpope	ignoring your use of "automatically", it doesn't remove anything
22:54	tpope	if you defined a function, it's not automagically undefined just because you deleted it from the file
22:56	bttf	heh
22:56	bttf	i guess if the behavior of the function is changed that will be reflected when reloaded
22:57	bttf	but if its flat-out deleted? shouldn't that somehow be reflected the same way?
22:57	bttf	i guess the repl isn't made to work like that
23:08	bttf	thx for the help tpope
23:09	tpope	ta
23:44	dr_choc	Anyone here mess around with clojurescript? Specifically the browser repl?
23:46	brehaut	~anyone
23:46	clojurebot	Just a heads up, you're more likely to get some help if you ask the question you really want the answer to, instead of "does anyone ..."
23:46	brehaut	(inc amalloy)
23:46	lazybot	⇒ 49
23:52	dr_choc	Has anyone found the cljs browser repl to be finicky? I'm using the lein-cljsbuild plugin and running lein trampoline cljsbuild repl-listen to get a repl, but sometimes it works and sometimes it just hangs as if the browser never connected, but I can see in the network tab (chrome) that it does connect. Any ideas?