#clojure – 2015-09-25

2015-09-25

02:16	tianyu	this is test
02:17	tianyu	Trouble of eval clojure block within org-mode by cider :
02:17	tianyu	org-babel-execute:clojure: Wrong number of arguments:
02:17	tianyu	((cider-buffer-ns cl-struct-nrepl-response-queue-tags t) (input
02:17	tianyu	connection session &optional ns) "Send the INPUT to the nREPL server
02:17	tianyu	synchronously.The request is dispatched via CONNECTION and SESSION.
02:17	tianyu	The code is :
02:17	tianyu	#+BEGIN_SRC clojure
02:17	tianyu	(+ 1 2)
02:17	clojurebot	3
02:17	tianyu	#+END_SRC
02:17	tianyu	Plz help.
05:32	anti-freeze	Hi everyone. I need some help with ui.router. For some reason, every time I refresh the browser, ui.router redirects me to main.home, which is a route on top of the main abstract route. If I remove that route, everything works as normal. Here's the source code: http://plnkr.co/edit/WEvXWkpPolm7fMN54PxS?p=catalogue . Any ideas?
05:34	anti-freeze	Wrong channel
05:34	anti-freeze	Sorr
05:34	anti-freeze	Sorry
08:10	wasamasa	now I know why it took so long to port pprint to cljs
08:11	wasamasa	it contains an implementation of CL's format
10:15	Guest24	good morning folks
10:31	triss	hey all, is there a reason the definition of clojure.core/fn is such a dense blob of code?
10:32	triss	for example would pulling out the :pre and :post related stuff to some private functions/macros?
10:35	TimMc	I don't think there's a good reason, if that's what you're asking.
10:35	TimMc	Some parts of core are a crawling horror because they haven't been touched since Clojure was still in very early development, and I think the Core team is reluctant to clean up code that is working.
10:36	TimMc	There's something to be said for that.
10:41	sdegutis	When you use Components for your web app, do you even wrap your routes within a component?
10:43	kungi	sdegutis: I do. But you don't have to.
10:44	sdegutis	I'm having a hard time figuring out which things should be Components and which should just continue to be normal Clojure functions which Components call.
10:44	kungi	sdegutis: It depends on how you would like to inject your dependencies into your routes
10:46	sdegutis	Oh good point.
10:49	sdegutis	kungi: so the only practical difference is whether the functions can implicitly access record fields vs. having parameters to receive them?
10:49	sdegutis	There's no difference in terms of code-reloading?
10:53	kungi	sdegutis: As far as I see. Yes
10:54	kungi	sdegutis: You could also inject the Components into the http request through a middleware. This way you don't have to use function parameters.
10:56	craftybones	Are sets ordered by default in clojure? If so, is there a canonical way of finding the index of a member?
10:56	kungi	craftybones: no they are not ordered
10:56	craftybones	Thanks @kungi
10:56	bja	I have a component that takes an argument of things that will exist at start time on the ring-app component to be injected into the request
10:56	kungi	craftybones: there is sorted-set for that
10:57	craftybones	@kungi I don't want it sorted. I guess I'll just use a vector
10:57	xeqi	sdegutis: I usually just wrap the server, db, etc. Then I have the server build a ring handler passing in the components needed, but the ring handler/routing is just functions
10:57	bja	something like that: https://gist.github.com/b45d2dbf2fbf5ea8afe1
10:58	bja	actually need to finish the blog post that code belongs to, it's a demo of using component to manage hot settings pushes from zookeeper
11:11	sdegutis	xeqi, kungi: thanks, very informative and helpful
11:12	sdegutis	I wonder what the downsides are of making everything be a Component, no random functions floating around.
11:12	sdegutis	I guess the main downside would be that it can't easily just say "okay, reload this function definition" while developing live (e.g. via CIDER), instead you have to shut down and restart the entire System component.
11:16	xeqi	sdegutis: I imagine the boiler plate for getting the setup/teardown for tests could get annoying
11:18	xeqi	though if you pushed it far enough you'd basically have immutable namespace
11:18	sdegutis	xeqi: actually that would be the easiest part: there would be a (test-system) constructor function, which creates real versions of everything, except if there are any services which leave the system (e.g. email-service-component) then it would use an in-memory version.
11:19	sdegutis	xeqi: and each in-memory component would use atoms for state so you could easily setup state and test their side-effects in tests
11:20	sdegutis	E.g. my email-service takes an atom of emails, which I have a helper-macro that resets it to an atom that it lets me name and inspect after my test runs.
11:26	xeqi	sounds like what i do, though the recent cognicast has some mention of use cases for async channels instead of atoms
11:26	xeqi	was overthinking the amount of isolation needed between tests when i mentioned the boilerplate
11:27	sdegutis	To this day I still don't understand when I need core.async.
11:30	bja	sdegutis that's only actually a downside of the current implementation of component (needing to restart everything)
11:30	sdegutis	bja: well it's not even really that much of a downside :)
11:30	bja	I've seen multiple private forks that take a new and current system and diff+ walk the system and only restart changed things
11:30	bja	yeah, it's not too bad
11:32	bja	I've actually seen people (other than myself) using com.stuartsierra.component/Lifecycle to build components but starting/managing them with heavy forks of the original codebase
11:33	sdegutis	bja: hmm I wonder why they haven't been merged back in?
11:34	bja	all of the ones except mine are private that I'm aware of
11:35	bja	and mine isn't that heavy (it just uses destructure to process dependency injection maps)
11:35	bja	there's a PR on component where stuart rejected mine, and I don't necessarily disagree with his reasons, but I find my fork useful
11:41	justin_smith	bja: I have a cljc fork
11:42	justin_smith	it's not "heavy" though, just cljc
11:42	justin_smith	one of these days I'll port all the tests to cljs.test and make a PR
11:43	bja	by heavy, I mean that almost none of the implementation details for starting/stopping are the same
11:43	bja	I think my fork is something like a 40 line diff where I add a couple functions
11:43	justin_smith	bja: but if I am using component to provide lexically closed resources with a lifespan, all components using a changed component need restarting
11:43	justin_smith	(reading scrollback now)
11:48	tianyu	An error of eval clojure within org-mode: org-babel-execute:clojure: Wrong number of arguments: ((cider-buffer-ns cl-struct-nrepl-response-queue-tags t) (input connection session &optional ns) "Send the INPUT to the nREPL server synchronously.
11:48	tianyu	The request is dispatched via CONNECTION and SESSION.
11:48	tianyu	If NS is non-nil, include it in the request." (nrepl-send-sync-request (nrepl--eval-request input session ns) connection)), 1
11:48	tianyu	PLZ help
11:49	justin_smith	tianyu: cider changes constantly, is org-babel even supposed to be working these days?
11:52	justin_smith	or, maybe a better way to put it - which version of cider is your version of org-babel's clojure support compatible with, and are you using that version?
11:54	sdegutis	Aw, this PR could have been useful https://github.com/stuartsierra/component/pull/25
11:55	justin_smith	yeah, I just made my own stupid helper that does that
11:55	justin_smith	(as something outside component proper)
11:56	sdegutis	Are you supposed to get System components via keyword-access?
11:57	justin_smith	yeah, the system passed into your start or stop method has all your dependencies associated on as keywords
11:57	justin_smith	or, with your selected keywords as keys
11:59	sdegutis	Right.
12:00	sdegutis	So it's idiomatic to destructure them, like (let [{:keys [db router time]} sys] ...) and use them like (get-today time) and (handle-req router req) ?
12:02	justin_smith	yeah, that seems straightforward, though it's usually nested deeper because I make components that each provide their own map of things
12:02	justin_smith	maybe you are doing it more modular so each component only provides one thing?
12:03	sdegutis	justin_smith: I'm not sure what you mean.
12:03	sdegutis	justin_smith: I have a flat list of components, but each component may depend on other components (no circular dependency though).
12:04	justin_smith	sdegutis: my components each provide a map with multiple things you might want from it
12:04	sdegutis	justin_smith: so I have [db router time-service email-service ...] but db may depend on time-service
12:04	justin_smith	wait, where is this destructuring happening again?
12:04	sdegutis	justin_smith: oh you mean each component has getters?
12:04	sdegutis	justin_smith: oh good point... I meant at the top-level entry point
12:05	justin_smith	each component associates multiple keys, and a component using it has to pick out the keys it wants
12:05	sdegutis	justin_smith: within a component, it just has the depended-upon components as record fields which are always visible
12:05	justin_smith	OK, what does destructuring at the top level entry point do for you?
12:05	sdegutis	justin_smith: oh good point.. I guess I don't need it
12:05	sdegutis	Okay, solved!
12:05	sdegutis	Thanks justin_smith.
12:05	sdegutis	justin_smith: tbh I'm mapping this out, I don't actually have code yet just a diagram
12:06	justin_smith	it was a legitimate question, but I guess "nothing" is an answer too
12:06	justin_smith	haha
12:06	sdegutis	I'm preparing for transforming my services into components (services were my ad-hoc solution I've been using before component was written)
12:15	elika	hello
12:16	blkcat	x1/win 32
12:16	blkcat	...wow
12:16	sdegutis	blkcat: what?
12:16	blkcat	don't mind me :D
12:16	scriptor	anyone know where LEIN_PASSWORD is coming from in https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L103 ?
12:17	sdegutis	blkcat: plz do tell
12:17	sdegutis	scriptor: its an env variable
12:17	scriptor	yes
12:17	scriptor	that much is clear
12:17	sdegutis	scriptor: you're supposed to set it
12:17	sdegutis	scriptor: that's how they work
12:18	scriptor	you misunderstand, I'm trying to figure out how leiningen is able to get LEIN_PASSWORD in the first place
12:18	scriptor	I know how to set a bash env variable
12:18	scriptor	but how does lein know that's the env variable?
12:18	sdegutis	scriptor: according to the comments above it, when it sees :env, it asks for the environment variable
12:19	sdegutis	scriptor: probably via (System/getEnvironmentVariable "LEIN_PASSWORD") or whatever the static function name is
12:19	justin_smith	sdegutis: System/getenv
12:19	sdegutis	yeah that
12:19	justin_smith	,(System/getenv "PWD")
12:19	scriptor	but how does lein know to ask for LEIN_PASSWORD, there's no other reference to that anywhere els
12:19	clojurebot	#error {\n :cause "access denied (\"java.lang.RuntimePermission\" \"getenv.PWD\")"\n :via\n [{:type java.security.AccessControlException\n :message "access denied (\"java.lang.RuntimePermission\" \"getenv.PWD\")"\n :at [java.security.AccessControlContext checkPermission "AccessControlContext.java" 372]}]\n :trace\n [[java.security.AccessControlContext checkPermission "AccessControlContext.java...
12:19	justin_smith	:P
12:19	sdegutis	I get the naming conventions between that and System/getProperty mixed up
12:19	sdegutis	scriptor: it's hard-coded in
12:20	sdegutis	scriptor: I'm really having trouble understanding a reason for your confusion on this
12:20	scriptor	ah, so LEIN_PASSWORD is a hardcoded variable that lein looks for
12:20	sdegutis	scriptor: it's a reasonable convention that Leiningen is using, where it gives you a name of an env variable which you can then set if you choose, and gives you a way to tell it to look for it
12:21	scriptor	the comment says that an "environment variable will be used based on the key"
12:21	scriptor	since the key is :password
12:22	justin_smith	scriptor: hmm, maybe it is constructing the variable to look up based on the key?
12:22	scriptor	I was wondering if lein simply uses that key and prepends 'LEIN_' to it to create the actual environment variable name
12:22	sdegutis	scriptor: right, it's saying: if the value is a string, it uses that literally; if it's literally :env, it looks in the environment variable "LEIN_PASSWORD" for a literal string to use
12:22	scriptor	maybe
12:23	scriptor	sdegutis: the value is :env, but the key is :password, are you saying that somewhere inside lein the :password key is hardcoded to map to LEIN_PASSWORD?
12:24	justin_smith	scriptor: I think it is more likely that :foo is hardcoded to be LEIN_FOO (somewhere) but I am not finding evidence of any of this searching the lein github repo for getenv usage
12:24	sdegutis	justin_smith, scriptor: it's probably literally this code: (let [m {:password "foo"} {:keys [password]} m password (if (= password :env) (System/getenv "LEIN_PASSWORD") password)] ...)
12:24	sdegutis	Ore more clearly: (let [{:keys [password]} {:password "foo"}, password (if (= password :env) (System/getenv "LEIN_PASSWORD") password)] ...)
12:24	scriptor	so, you're not certain?
12:24	justin_smith	sdegutis: the weird thing is LEIN_PASSWORD only shows up in the readme, nowhere in code
12:24	scriptor	^
12:25	sdegutis	scriptor: I'm telling you that's what the documentation claims; I haven't looked at the code so I don't know, but that's what the docs are saying
12:25	sdegutis	justin_smith: ooooh
12:26	sdegutis	scriptor: ah so yeah it's probably a convention like justin_smith says, where it probably has this: (defn get-value [m k] (or (get m k) (System/getenv (format "LEIN_%s" (name k)))))
12:26	sdegutis	In which case it's doing (get-value your-map :password)
12:27	sdegutis	I bet a grep for "LEIN_" would turn that function up.
12:29	scriptor	https://github.com/technomancy/leiningen/blob/1bc9d42c430b0c94c0a25e8f869c94bb41d9b2cf/leiningen-core/src/leiningen/core/user.clj#L144
12:29	sdegutis	there you go
12:30	scriptor	so my assumption was right, it takes the key and simply prepends LEIN_ to it
12:30	sdegutis	you got it bud
12:31	justin_smith	sdegutis: you forgot the part where it converts to SHOUTY_CASE
12:31	justin_smith	but yeah
12:31	sdegutis	touché
12:31	sdegutis	wha? why?
12:32	xemdetia	much like strfry
12:32	justin_smith	because it's silly of course
12:32	xemdetia	this is a vital part of libraries
12:32	justin_smith	xemdetia: exactly
12:37	TimMc	Wow, that's gross.
12:37	TimMc	I don't like it when variable names are constructed, it makes them hard to grep for. :-)
12:38	sdegutis	TimMc: meh it has a time and place
12:38	sdegutis	TimMc: now /function names/ on the other hand...
13:14	justin_smith	sdegutis: TimMc: worst is when entire namespaces are made that way.
13:15	sdegutis	justin_smith: never heard of that
13:15	justin_smith	there's one amazon api wrapping project in particular, turns each class in the api into a namespace, each static method gets a function wrapper
13:16	justin_smith	sdegutis: so if you go into the code looking for the code for the thing you are using, you find nothing, just the general odor of magic in the air
13:17	justin_smith	sdegutis: this macro, on line 5, creates a whole namespace full of vars and functions https://github.com/mcohen01/amazonica/blob/master/src/amazonica/aws/cloudformation.clj
13:18	justin_smith	s/macro/function - here is the function with its doc https://github.com/mcohen01/amazonica/blob/master/src/amazonica/core.clj#L884
13:19	justin_smith	sdegutis: so someone is like "how do I use cloudformation/foo" and I go look at the source, and I'm like "wat"
13:21	jstew	Offer to rwrite it :)
13:21	justin_smith	haha
13:27	bja	amazonica is the one that manages client objects in some var (global? thread-bound?) for you right?
13:28	justin_smith	bja: sounds about right - it puts all kinds of things into vars
13:29	bja	if this is the one I'm thinking of, it was fine for devops scripts but made it worthless to my service since I was putting everything in components
13:29	jstew	vars are like violence? :)
13:29	justin_smith	jstew: vars are global, which can be inflexible
13:30	bja	I mean, it's fine if an api just handles managing the client for you, as long as there's some way to break out and pass in a particular client instead of the global thing
13:31	bja	and by some way, I don't mean reflecting/binding private stuff
13:31	jstew	Is there any value to it over just calling out to java, since that's what it's doing for you, albeit in a messy way?
13:31	bja	it has a few higher level abstractions so you don't have to paginate certain things yourself
13:31	justin_smith	bja: it was a big revelation to me that when I was working on a lib (that could potentially use globals vs. dynamic vars vs. explicit value passing) that every other method of sharing a value can be derived from explicitly passing a value to a consumer. But that's the only flexible one, the others are not inter-compatible.
13:32	bja	justin_smith: that's an excellent way of putting it
13:32	justin_smith	bja: so by using explicit passing of an arg, you leave the most flexibility for the developer making their own app
13:33	bja	I did that for clj-aws-s3 here: https://github.com/curiosity/clj-aws-s3
13:33	bja	I think there are 3 or 4 different forks that do essentially the same thing w.r.t to removing the implicit dynamic vars
13:34	justin_smith	they can use globals or dynamic vars or atoms or deserialized objects from a db or whatever the hell they want, and it will all be compatible with explicit arg passing in the end
13:34	justin_smith	bja: hah, makes sense
13:35	bja	actually, looking at that, I probably need to type-hint all those client arguments
13:36	bja	I should profile that next week
13:37	bja	oh, forgot, clj-aws-s3 wasn't even a dynamic var, it was just a private global
13:37	bja	that was memoized so you couldn't even call it again
13:37	justin_smith	haha, nice
13:37	bja	but it had nice abstractions for s3
13:37	bja	so it was worth forking and maintaining
14:37	preyalone	Which plugin { id ... } ... apply plugin: ... should I drop into build.gradle for Clojure projects?
14:41	RedNifre	good evening
14:42	snowell	preyalone: I don't know that there would be a build.gradle. Generally we use leiningen to build clojure projects, so you'd have project.clj instead
14:44	RedNifre	So I started with Clojure three days ago and the language looks fine to me. Now I wonder about the practical side: Is Cursive any good, how would it fit with Android Studio, is there some clojure library repository somewhere (or are clojure libraries just jars that you add to your gradle file?) how does it all fit together?
14:45	ToxicFrog	RedNifre: I can answer the clojure library repository part, at least
14:45	RedNifre	great :)
14:46	ToxicFrog	The de facto standard library repository is Clojars; if you're using Leiningen, the Clojure build tool, it knows how to download libraries from there automatically if you list them in the deps
14:46	justin_smith	we use leiningen instead of gradle - or at least 99% of us do
14:46	ToxicFrog	It also has support for fetching libraries from github and I think a few other sources
14:46	ToxicFrog	I have no idea what gradle is
14:46	justin_smith	ToxicFrog: it's like leiningen for groovy or something
14:47	preyalone	snowell: Aye, Leiningen is an optino. But I'd prefer to use one build manager for all my altJVM projects, rather than a medley of Maven + Rake + Leiningen + Grapes
14:47	RedNifre	I heard of leiningen, but have no idea what it is yet. Does it only fetch clojure libraries or can I also fetch any other jar, e.g. from maven central?
14:47	justin_smith	RedNifre: clojure libraries are hosted in any jar repo, there are some on maven central too
14:47	RedNifre	gradle is just a build tool. you have a gradle file like you have a pom file or an ant file I guess.
14:48	justin_smith	RedNifre: leiningen uses the maven spec (but not maven itself0
14:48	justin_smith	right, leiningen is a build tool also
14:48	RedNifre	okay, so I would write some clojure code, add dependencies with leiningen, both clojure jars and regular jars and in the end I compile it into one jar that will just work like a java jar?
14:48	justin_smith	exactly
14:48	ToxicFrog	That said, clojure libraries are either jar files, or clojure source you can turn into jar files, so if you're using some non-lein build tool that consumes jars you can just feed them to it without issue.
14:48	ToxicFrog	If you're using lein it also has an "uberjar" command that combines the jars for all your libraries with the program/library you're building so that it's self-contained, which is handy for self-contained deployment.
14:50	schmudde	Yep. Leiningen user here. I'm consistently surprised at its power. Right now I need a little ClojureScript functionality as well... and I'm running that compile along with the a hosted Clojure web app.
14:50	RedNifre	ah, I think that was called "fat jar" in eclipse.
14:50	schmudde	Works great with Clojars.
14:50	snowell	RedNifre: I think you're right. Uberjar is a much cooler name
14:50	ToxicFrog	justin_smith: I don't know what groovy is either soooooo
14:50	justin_smith	ToxicFrog: yet another jvm language
14:51	justin_smith	ToxicFrog: so gradle uses groovy to build things in the way that leiningen uses clojure to build things
14:52	RedNifre	It sounds like building a simple jar that can run on a server is easy. Though I still wonder how to make use of clojure on android, either by having an app that is all clojure or by having the bulk of your code in a clojure jar but handle all the android specifics in java...
14:53	RedNifre	With gradle, your build file is a groovy program. If leiningen build files are written in edn then it should be the same concept.
14:53	ToxicFrog	aah
14:53	justin_smith	RedNifre: I'd look at one of the existing android clojure projects. Interop from clojure to java is very easy for the most part (unless you need to inherit from a specific class, that can be annoying from clojure sometimes)
14:53	justin_smith	RedNifre: they are!
14:53	RedNifre	I don't know Groovy the language, but the syntax is fine so I like gradle files :)
14:53	justin_smith	RedNifre: lein inputs being edn / clojure code, that is
14:55	bja	/join #pixie-lang
14:58	ToxicFrog	RedNifre: as far as android goes, I've only dabbled in it very briefly, but since you can call java directly from clojure very easily, there was no need for java compatibility layer or anything
14:58	ToxicFrog	The drawback is that the resulting app takes forever to load as it dynamically loads/initializes the clojure runtime and stdlib
14:58	RedNifre	oh
14:59	ToxicFrog	There is some work on improving that, not sure how far along it is -- this was back in late 2013, IIRC
14:59	xemdetia	yeah that was what I was mentioning yesterday
14:59	RedNifre	I remember trying Ruboto (JRuby for Android), but the app took 10 seconds to start back then (I think it's down to 3 seconds now, but still...).
14:59	xemdetia	part of the android system is that there is one JVM that never gets unloaded
14:59	ToxicFrog	If you can get away with running as a Chrome App or similar, you can use cljs instead of cljvm
14:59	RedNifre	hm.
14:59	ToxicFrog	Which will probably load a lot faster, although I haven't tried this outside of the test environment
15:00	RedNifre	so how long is "takes forever to load"? 1 second? 10 seconds?
15:02	ToxicFrog	RedNifre: on a Galaxy Nexus, two years ago -- ~15 seconds.
15:02	ToxicFrog	For hello world.
15:02	ToxicFrog	But like I said, there has been a lot of active work since on improving this.
15:03	ToxicFrog	E.g. some quick googling finds http://blog.ndk.io/2015/04/23/state-of-coa.html and http://clojure-android.info/skummet/
15:03	bja	There is a lein plugin that uses a forked compiler and some tooling that does some additional optimization to make clojure on android slightly better
15:04	bja	ToxicFrog found it
15:04	bja	I think the plugin is `lein-droid` or something like that
15:05	RedNifre	yeah, I'm reading about those.
15:08	bja	I wonder if React Native boots fast enough to make it worth using cljs and something like Reagent/Om for an Android app
15:08	bja	the demo here looks interesting: https://github.com/Gonzih/reagent-native
15:12	RedNifre	What's the meaning of ^Something again?
15:20	bja	typehint
15:25	schmudde	I haven't done any mobile development work, and I don't plan on leaving emacs, but Nightcode looks like an interesting way to hit the ground running for Clojure across platforms: https://sekao.net/nightcode/
15:26	schmudde	looks like it uses lein-droid...
15:26	schmudde	Anybody use it?
15:27	bja	RedNifre: technically it's a tag
15:27	bja	which doesn't have to be a typehint
15:35	dillap	Is there any writeups for adding reagent to an existing (non-cljs) clojure webapp?
15:35	dillap	Everything I can find assumes you are starting from scratch, and configuring the compiler and setting up figwheel is a bit intimidating.
15:43	RedNifre	hm, nightcode sure looks interesting.
15:46	sdegutis	blkcat: React Native? as opposed to Reagent?
15:46	sdegutis	Oh, Android stuff.
15:57	irctc	Is there a performance difference between running a compiled jar and using 'lein run'?
15:58	sdegutis	irctc: lein run will compile the jar and do some other fancy things, and spin up two JVMs
15:59	sdegutis	irctc: it's faster to run a jar directly, but the you don't have access to any Leiningen plugins (unless they were used to compile the jar)
15:59	irctc	gotcha
15:59	sdegutis	irctc: and it's recommended to build an uberjar (via 'lein uberjar' maybe) and deploy that jar to production for running
15:59	irctc	right, I'm doing that, just was curious about the other way
15:59	irctc	thnx
16:00	irctc	Anybody using docker to deploy clojure apps?
16:09	schmudde	irctc - I'm haven't used Docker, but my experience with Clojure and Heroku has been good so far.
16:10	codefinger	irctc: schmudde: use both! http://jkutner.github.io/2015/08/17/deploy-clojure-immutant-heroku-docker.html
16:11	schmudde	codefinger: interesting. Why would you want to use both?
16:12	codefinger	schmudde: having the locally development env is a plus. but if you are happy with your current heroku setup... i would recommend sticking with that.
16:12	codefinger	you can mix and match too. so if you set it up for Docker, you can still deploy with Git
16:13	codefinger	the addons is really key though. being able to run a "local heroku" with addons can help you debug stuff
16:13	schmudde	codefinger: I think I understand what you're saying. Don't I get the same features out of Leiningen's Environ? I have a dev environment and a production deployment.
16:14	schmudde	codefinger: Yeah, debugging is tough. I cross my fingers whenever I deploy b/c I cannot test as a "local heroku". Interesting.
16:14	codefinger	schmudde: i agree. lots of people seem to want docker support though... because reasons :)
16:15	codefinger	schmudde: wrt debugging http://jkutner.github.io/2015/05/19/heroku-remote-debug-java.html
16:15	schmudde	codefinger: Thanks for the tip. I'll dig a little deeper online. I'm new to the auto app deployment game. I've always done it manually, but my hosting provider isn't going to add JVM support any time soon.
16:16	codefinger	that's a bit of a hack. there is going to be some good/better stuff coming soon. can't really say (I work at heroku) but think nrepl :)
16:16	justin_smith	also, it's possible to go the opposite direction of docker too - something like OSv where there is no operating system, the hardware vm loads a jvm directly, and the jvm runs your code
16:16	schmudde	codefinger: Cool!
16:27	TEttinger	justin_smith: I can't remember, do you work for heroku or was it another long-time resident of #clojure ? Raynes?
16:28	justin_smith	TEttinger: technomancy once did
16:28	TEttinger	ah that would maybe explain it
16:28	justin_smith	TEttinger: being mistaken for technomancy is quite flattering
16:28	TEttinger	I know someone did it a few days ago with me
16:28	TEttinger	te*
16:29	TEttinger	(identity justin_smith) ;; BOT FAILURE
16:30	justin_smith	TEttinger: clearly what happened is my karma finally exceeded that of amalloy and so amalloy took the bot down to hide his shame
16:30	TEttinger	haha
16:30	justin_smith	(I don't think any of these things actually happened)
16:31	TEttinger	yeah amalloy stepped up his game when your karma started approaching his
17:28	devth_	my clojure's a little rusty. easy way to pick the first function that returns non-nil when applied to a value?
17:28	justin_smith	somefn
17:28	justin_smith	(doc somefn)
17:28	clojurebot	It's greek to me.
17:29	justin_smith	some-fn but, err, that doesn't pick a function, that picks a non-nil result
17:29	devth	(doc some-fn)
17:29	clojurebot	"([p] [p1 p2] [p1 p2 p3] [p1 p2 p3 & ps]); Takes a set of predicates and returns a function f that returns the first logical true value returned by one of its composing predicates against any of its arguments, else it returns logical false. Note that f is short-circuiting in that it will stop execution on the first argument that triggers a logical true result against the original predicates."
17:29	devth	justin_smith: it works in my case. thx!
17:29	devth	not sure i ever used that even when i was writing a lot of clj
17:30	devth	((some-fn :no :yes :bad) {:yes 1})
17:30	devth	my original question wording wasn't precise
17:30	justin_smith	,((some-fn :no :yes :bad) {:yes 1})
17:30	clojurebot	1
17:30	justin_smith	so there are multiple keys you might find, and the first non-falsey is good
17:30	sdegutis	Wow
17:31	sdegutis	some-fn looks incredibly useful in some cases
17:31	sdegutis	Can't figure out which ones tho
17:31	justin_smith	sdegutis: stupid apis that can't decide which key your data is under
17:31	sdegutis	ah interesting, for legacy stuff
17:31	TimMc	,(filter #(% {:yes 1}) [:no :yes :bad])
17:31	clojurebot	(:yes)
17:31	sdegutis	what else?
17:31	devth	i'm actually using this to catch errors in stupid apis that name error message differently :)
17:32	sdegutis	TimMc: also juxt
17:32	justin_smith	sdegutis: but juxt does not short circuit
17:32	sdegutis	maybe outside the filter?
17:33	sdegutis	,(filter #(if-let [x (% {:yes 1})] ((juxt identity %) {:yes 1})) [:no :yes :bad])
17:33	clojurebot	(:yes)
17:33	sdegutis	or something
17:33	sdegutis	I dunno anymore
17:33	justin_smith	oh, you are trying to get the first key that got a non-nil result
17:34	justin_smith	eg. what the question might have implied (but did not in fact want)
17:50	devth	would be neat if i could do (format ":foo is a :bar / :qux" {:foo 1 :bar 2 :qux 3})
17:51	justin_smith	devth: seems like an easy enough function to write!
17:51	devth	justin_smith: yep
17:54	devth	but instead im resorting to: (apply (partial format "%s %s: %s") (map (% vpc) [:vpc :flavor :capacity]))
18:13	justin_smith	hmm... I think a clever regex could turn that into the version you want though
18:14	justin_smith	you could even get fancy and have :2d act like %2d etc...
18:49	amalloy	devth: (apply format "..." (map ...))). there's no need for this partial nonsense
18:49	devth	oh yeah. thanks
18:55	bitraider	any good recommendations on modern web app development in clojure... tutorials/books?
18:56	sdegutis	devth: actually yeah that function would rock
18:56	sdegutis	justin_smith: regex is never the answer
18:56	amalloy	that function has been written a lot of times. peronally i don't really see a big advantage over the existing format function
18:57	sdegutis	amalloy: it combines (format) with destructuring, with the added benefit of being able to see what's put in the string where relative to each other
18:57	devth	just a minor advantage :)
18:58	sdegutis	amalloy: so personally I think (format2 ":name, :email" user) is nicer than (format "%s, %s" (:name user) (:email user))
18:58	sdegutis	That said, I usually end up destructuring earlier, so it's (format "%s, %s" name email) which isn't /that/ bad
18:58	devth	y no string interpolation, clj?
18:58	devth	even scala got it :-)
18:59	justin_smith	when we decide we don't have room for features, we give them to scala
18:59	justin_smith	scala is a feature hoarder
18:59	turbofail	there's a library that has a string interpolation macro
18:59	schmudde	lol
18:59	devth	justin_smith: ha ha
18:59	sdegutis	Scala is where our features go to die.
19:00	devth	clj where every imaginable lang feature exists as a lib
19:00	sdegutis	devth: except core.async is not as flexible as it could be in a static language, even with core.typed thrown in
19:00	devth	that's interesting
19:00	sdegutis	devth: so yes, features can be added via libs, but only /to an extent/
19:01	devth	so not exactly the same as e.g. haskell extensions
19:02	sdegutis	similar, but haskell extensions have their own limitations too.. like, it's really hard to dynamically find and refer to functions in files in the local tree
19:02	sdegutis	*local file tree
19:03	sdegutis	no one language can be everything, because some things within everything contradict each other
19:05	devth	i wonder if contradictory lang features can solved by importing features where need, like scala has done
19:06	sdegutis	There would be conflicts in libraries.
19:06	devth	but the imported feature is local to files
19:06	sdegutis	It'd be a bigger mess than it already is.
19:06	sdegutis	Consider the C++ ecosystem
19:06	devth	import scala.language.higherKinds
19:06	devth	actually isn't that how haskell works too?
19:07	sdegutis	And what if one lib requires this feature to work, and another lib is incompatible with this feature, and you need both libs?
19:07	devth	the feature is only enabled for the local file
19:14	amalloy	that's what racket does
19:21	sdegutis	amalloy: weird
19:35	noncom\|2	hmm, now thinking of the clojure and jvm startup time. could somebody tell me, why can't we have the java vm running as a service, without a restart and just wipe its memory to "restart" without actually restarting?
19:36	wink	noncom\|2: have you had a look at drip or nailgun?
19:36	noncom\|2	nope
19:38	wink	noncom\|2: also, https://github.com/technomancy/leiningen/wiki/Faster
19:38	noncom\|2	okay, these are practical solutions, i am going to try them out
19:39	wink	not saying there are real solutions, but people have spent thinking and tinkering ;)
19:39	noncom\|2	but i wonder what is the explanation behind that JVM cannot be clean-wiped
19:40	noncom\|2	in readme of drip it says that cake is taking this approach and it gets jvm overwhelmed by errors over time
19:42	noncom\|2	also, drip is year old, does it fit today?
19:42	xeqi	some problems might be external resources like file handlers and sockets, and stopping background threads/threadpools
19:54	tom``	I'm trying to set up nginx in front of ring. Netstat shows it listening on ":::8080" but when I proxy_pass nginx to "http://localhost:8080" it give a 502 error.
19:54	tom``	curl to localhost:8080 says connection refused
19:55	tom``	but curl to :::8080 works fine
21:39	sdegutis	noncom: Component allows that workflow you're talking about
21:43	bitraider	has anyone used Luminus for web development...any comparison to Compojure ??
22:07	retrogradeorbit	hi
22:08	hlolli	Im in a let function and I want to find the max value of list/vector with (apply max) but I get java.lang.Long cannat be cast to IFn. I assume its because the list derives from various seqs, butall wont fix. Is there an alternative finding max value of say '(1 2 3 4) list?
22:09	hlolli	butall = but doall... yes bugs make my eyes blurry
22:13	retrogradeorbit	sure max has not been rebound as a number... a long?
22:15	hlolli	if I try to cast it as long or int I get; Expecting var, but Double is mapped to class java.lang.Double
22:15	hlolli
22:15	hlolli	ok this one was double, same for all types
22:15	retrogradeorbit	what code are you running? (apply max '(1 2 3 4)) works fine for me
22:16	retrogradeorbit	croak.macros> (apply max (map double '(1 2 3 4)))
22:16	retrogradeorbit	4.0
22:16	retrogradeorbit	how do I get the clojure bot here to run code?
22:17	retrogradeorbit	~4
22:17	clojurebot	Titim gan éirí ort.
22:17	hlolli	(apply max (map val (doall (select-keys @t-ref-buffer (modulo-keywords (if (zero? (:no @t1-ref-buffer)) 3 (:no @t1-ref-buffer)))))))
22:17	hlolli	,(prn "code running")
22:17	hlolli	it's crambled
22:17	retrogradeorbit	,4
22:17	clojurebot	"code running"\n
22:17	clojurebot	4
22:18	retrogradeorbit	,(apply max (map double '(1 2 3 4)))
22:18	clojurebot	4.0
22:19	retrogradeorbit	whats val, and max?
22:19	retrogradeorbit	reduce is the same here as apply
22:20	retrogradeorbit	,(reduce max '(1.0 2.0 3.0))
22:20	clojurebot	3.0
22:20	hlolli	the val if I do prn it's (1 1 1) with mapv [1 1 1] very simple
22:20	retrogradeorbit	(1 1 1) is not callable
22:21	hlolli	it's just that this data structure is different [1 1 1] can be different from [1 1 1]
22:21	hlolli	yes
22:21	retrogradeorbit	how can you map (1 1 1) as a function
22:22	hlolli	but I still get Don't know how to create ISeq from: java.lang.Long
22:23	retrogradeorbit	thats dirrerent to what you firs posted
22:23	retrogradeorbit	java.lang.Long cannat be cast to IFn.
22:24	hlolli`	lost internet, so I lost if you said anything last 3 min
22:24	retrogradeorbit	< retrogradeorbit> thats dirrerent to what you firs posted
22:24	retrogradeorbit	< retrogradeorbit> java.lang.Long cannat be cast to IFn.
22:25	hlolli`	yes, right, was looking at the error from high speed of errors
22:26	hlolli`	later one is correct
22:28	retrogradeorbit	does select-keys always return a sequence? always?
22:28	hlolli`	I got this to work, really really weird solution
22:28	amalloy	i would hazard a guess and say never, retrogradeorbit
22:29	hlolli`	I just made new let argument do the apply max
22:29	hlolli`	really strange I think
22:30	retrogradeorbit	hey does anyone here have chops working with connection errors in http-kit client?
22:30	retrogradeorbit	it _returns_ the error exception, not raising it
22:30	retrogradeorbit	how do I get the details inside?
22:30	retrogradeorbit	https://www.refheap.com/109969
22:31	retrogradeorbit	how would I get access to the cause?
23:32	justin_smith	retrogradeorbit: you can use .getStackTrace to see the stack (probably not helpful to you), if you want more information check the type, if you are lucky it will be exceptioninfo
23:37	justin_smith	retrogradeorbit: .getMessage might also be informative
23:37	sdegutis	hi jus
23:38	justin_smith	hello sd
23:38	sdegutis	hows it be
23:39	justin_smith	chill, keeping it real
23:39	sdegutis	w.
23:40	sdegutis	justin_smith: hey i found out about reddit btw
23:40	sdegutis	thats where i found this https://www.youtube.com/watch?v=IikaDKvC1as&feature=share have u reddit?
23:41	justin_smith	oh man, back when Ed McMahon did more than run sweepstakes scams.
23:54	sdegutis	ye that