#clojure – 2015-08-02

2015-08-02

04:37	Pupeno	Would prismatic schema superset something like validateur?
05:24	pepijndevos	Can I do something like this? (peek #{1 2 3})
05:28	pepijndevos	(rest (sorted-set 3 2 1 1)) works, but returns a seq.
05:34	pepijndevos	(let [s (sorted-set 1 2 3 4 5)] (disj s (first s)))
06:22	kwladyka	is it possible to tell REPL to show data like #{{...} /newline {...}} instead of all in one line?
06:23	kwladyka	or println or anything :)
06:25	lumafi	clojure.pprint/pprint
06:27	kwladyka	thx
06:46	kwladyka	is a way to write it shorter? (one line?) https://www.refheap.com/40c1388aa2224d0496825e2a5
06:47	kwladyka	or more but using (->>) <- this one will be perfect
06:49	Pupeno	I’m using validateur to validate user input. So I have a function called user/create that might create a user (and return it) or return a list of validation errors. Both a success returning a user and errors are maps, so they are impossible to distinguish without looking into the map itself. What’s the appropriate way to handle this so that callers now what happened? Should I tag the output, like [:success, user-map]
06:49	Pupeno	and [:error, validation-errors]? a-la Erlang?
06:51	kwladyka	Pupeno, i have something like error message bag, but it is my preferential
06:51	Pupeno	kwladyka: what do you mean by error message bag?
06:52	kwladyka	so i have [{:message "foo"}{:message "bar"}{:message "bla" :additional-info-or-code 1234}]
06:52	kwladyka	and i have functions like add-error-message etc.
06:53	kwladyka	and i am operation on that, also with validation
06:53	Pupeno	Is a message your model is it metadata about your model?
06:53	kwladyka	oh, ofcourse on the and it looks like {:errors [{:message "foo"}{:message "bar"}{:message "bla" :additional-info-or-code 1234}]}
06:54	kwladyka	i am using this like normal data
06:54	kwladyka	to feedback for GUI
06:55	Pupeno	How does it look when there are no errors for you kwladyka?
06:56	kwladyka	could be {} or {:errors []}
06:56	kwladyka	if i want know if errors appear i am checking if :errors is empty?
06:56	kwladyka	*not empty
06:57	Pupeno	But what about the data the is returned by the API when it succeeds.
06:58	kwladyka	brutal true is i copy a little this conception http://laravel.com/docs/5.1/validation#working-with-error-messages
06:58	kwladyka	of working with messages
07:00	kwladyka	maybe some similar library exist for Clojure, as i was looking a few months ago i didn't find but maybe i did't look carefully
07:01	Pupeno	kwladyka: that seems to deal with errors and only errors. validateur does that for me. That's not my question, my question is one level up the hierarchy, when you are dealing with either data or errors.
07:01	Pupeno	When I call create-user I either get a (created) user back or a bunch of errors, dealing with the errors is done, my question is how to deal with users or errors.
07:05	kwladyka	i am not sure i understand but i just return {:errors [] :something-more? []} or right data
07:05	kwladyka	i have to go, sorry
07:06	Pupeno	So, the presence of the key :errors identify that an error happened and the absent that it didn't. That means that for example, you can't have data that has the key :errors and you can't have data that is not a map.
11:57	justin_smith	pepijndevos: if you want something like rest / disj you want pop not peek :)
11:59	justin_smith	pepijndevos: which of course does not work for sets, even sorted ones
13:54	gfredericks	Bronsa: what does cljs tools.reader do when it encounters ratios or large integers?
13:56	Bronsa	gfredericks: just js/parseInt
13:56	Bronsa	and cljs.core// to create a ratio
13:56	gfredericks	Bronsa: any interest in that being customizable? a similar mechanism to data readers?
13:57	Bronsa	don't think cljs has a ratio type?
13:57	gfredericks	certainly doesn't afaik
13:57	Bronsa	oh look there's even a comment
13:57	Bronsa	(/ (-> numerator js/parseInt) ;;; No ratio type in cljs
13:57	Bronsa	(-> denominator js/parseInt)))); So will convert to js/Number
13:57	gfredericks	yeah I was just reading that :)
13:58	gfredericks	so if this were customizable it'd apply to large integer, ratio, and bigdecimal syntaxes
13:58	Bronsa	gfredericks: how would that work?
13:58	gfredericks	Bronsa: like data readers, but would pass the string elements to whatever functions were setup
13:58	gfredericks	{:ratio (fn [numerator-str denominator-str] ...), ...}
13:59	gfredericks	you could hijack the existing data reader stuff if you wanted to use some magic symbols or keywords or something to have them under
13:59	gfredericks	does the cljs compiler use tools.reader or LispReader?
13:59	Bronsa	tools.reader
14:00	gfredericks	oh man so this would actually be usable in the core language if we did it
14:00	Bronsa	gfredericks: would simply making match-number a ^:dynamic var be enough?
14:00	kwladyka	is function like this in Clojure? I want conj only if condition is true
14:00	kwladyka	(defn foo [x y]
14:00	kwladyka	(if (condition)
14:00	kwladyka	(conj x y)
14:00	kwladyka	x))
14:01	gfredericks	kwladyka: cond-> is a nice way to do that by hand
14:01	gfredericks	(cond-> x (condition) (conj y))
14:01	Bronsa	gfredericks: he wants (condition) not (condition x)
14:01	gfredericks	Bronsa: yeah that's what that does
14:01	Bronsa	oh wait
14:02	Bronsa	uh
14:02	Bronsa	I guess I never used cond-> :)
14:02	gfredericks	Bronsa: yeah I think the dynamic var would give the same capabilities
14:03	gfredericks	Bronsa: oh wait cljs uses the clj half of tools.reader doesn't it; so the "would make this work for the core language" thing isn't actually true
14:03	gfredericks	because the cljs compiler would still control the "how do I compile this jvm type to javascript" thing
14:06	kwladyka	gfredericks, i didnt use that function before, thx. I will ready about that.
14:06	gfredericks	np
14:15	kwladyka	gfredericks, any idea how can i use that here? https://www.refheap.com/72eaffe15ce641e8364ce86af
14:15	kwladyka	i jus want something in one line and be simple
14:15	kwladyka	but maybe it is not possible
14:16	gfredericks	kwladyka: you can't drop it in right there because you're in the middle of ->>, when you need ->
14:17	gfredericks	you can either have an outer -> or use plumbing.core/<-
14:17	gfredericks	or if all that is terribly confusing, you might stop using ->> for a bit
15:03	kwladyka	gfredericks, even with cond->> ?
15:04	kwladyka	i guess yes, it doesn't work :)
15:04	kwladyka	but maybe i have to split this into 2 functions
16:44	tmtwd	what is the right way to do this? http://pastebin.com/iM8JpSDR
16:45	tmtwd	http://pastebin.com/6LWemh7s where the sql def is like this
17:45	xificurC	why are so many things lagging in releases? Leiningen uses clojure 1.6.0 and nrepl 0.2.6. `lein new compojure hello-world' uses old deps and plugins. I noticed this with other templates too
17:45	xificurC	is just noone using the templates and don't care or what is the reason for this
17:45	expez	Because you haven't submitted a pull-request ye!
17:45	expez	+t
17:46	expez	also, people are busy / overextended
17:47	xificurC	yeah but I can't be the only one usining e.g. leiningen. nrepl 0.2.6 is almost 1 year old now
17:48	expez	It's fixed on master
17:48	xificurC	0.2.7 came in january. Don't tell me noone had the time to just bump the version in half a year
17:48	expez	it might not be as simple just bumping the version, though
17:49	xificurC	hm, lein release is 6 months old and >100 commits behind now
17:49	expez	lein is a pretty good example of a project in need of your help
17:49	expez	those guys are buried in issues
17:50	xificurC	why is that
17:50	xificurC	is lein buggy
17:51	expez	No, that's not what I meant, but it has a large scope and it's hard to get everything right
17:51	expez	There's also nobody paid to work on it anymore
17:51	xificurC	technomancy only seems to be merging PRs by now
17:51	Leonidas	also, sometimes things in the background change and some edge-cases are broken
17:52	Leonidas	expez: was technomancy ever paid to work on it?
17:52	expez	Leonidas: I think so, as part of his job supporting clojure for Heroku.
17:52	expez	If not his contribution is even more incredibible than it already is
17:52	Bronsa	xificurC: technomancy moved and is doing other stuff now
17:52	xificurC	Bronsa: moved in what sense
17:52	amalloy	yeah, he has mostly opted out of the internet
17:53	Bronsa	xificurC: http://technomancy.us/
17:53	xificurC	it's sad that today it sounds like you died when you do that
17:56	xificurC	Bronsa: thanks, read that, understand completely
17:56	xificurC	is the community still using lein in the large or is part of it moving to boot
17:57	expez	I'd be surprised if boot had more than 20%
17:57	Leonidas	xificurC: moved to thailand and makes keyboards now.
17:58	xificurC	Leonidas: yeah read it on his site as linked by Bronsa, but thanks
17:58	xificurC	expez: 20% is more than what I expected
17:59	Bronsa	likely way less than that
18:00	xificurC	should I invest in learning it, as a kinda newcomer
18:01	xificurC	or is lein more than enough and simpler
18:02	expez	stick with lein
18:03	expez	more blogposts, more people to ask, works with all tooling and still 'just works'
18:04	xificurC	thanks
18:04	xificurC	will hit the bed, thanks for your time guys, gn
18:04	ebzzry	why is the main function named -main?
18:12	justin_smith	ebzzry: because that's a convention
18:14	ebzzry	justin_smith: may you please point me, sir, to that list of conventions
18:16	expez	ebzzry: https://groups.google.com/forum/#!topic/clojure/rzvMp44ZN0I
18:17	justin_smith	ebzzry: it's a part of gen-class / aot. On a per-namespace basis, you can change the prefix, but the default prefix is -
18:17	justin_smith	ebzzry: java folks decided that the jvm convention would be that the method that gets run for a given class is the main method
18:19	ebzzry	justin_smith: ok
18:19	ebzzry	because the default prefix that clojure.core/gen-class looks for the prefix "-". ok.
20:05	arrdem	amalloy: have you rebased/merge with the new skummet build or shall I
23:33	TEttinger	gfredericks: I just had a thought regarding splittable RNGs
23:36	slester	I find that just being in this chatroom answers questions before I even have a chance to ask them.
23:37	TEttinger	say you create a new splittable rng, let's call it srng, with a seed, 1337 . this could just create a normal, non-splittable random number generator as a member of srng that produces seeds for other normal random number generators. then since we need a generator, we get the first number from the member seed generator with seed 1337, and use that as a seed for the first split-off generator.
23:38	TEttinger	calling split uses the original seed generator to generate a new seed, creates a new either non-splittable random number generator and stores it internally, or creates a new splittable generator with the new seed
23:51	arrdem	slester: this chat room solves problems you don't understand yet with voodoo you have the tools to approach
23:51	arrdem	*didn't know you had yet