Has anyone written a blog post on all pain you cause for downstream apps/libraries if you AOT compile your library.

https://groups.google.com/forum/#!topic/clojure/Bs70_PUj-TY

is there any way to get IntelliJ/Cursive to run “lein autotest” or something similar in the background? I’m specifically looking for an option to run all tests in a project in a clean environment and getting clickable errors so I can navigate to failing tests/inspect output etc.

Switching over to #C0744GXCJ

@joost-diepenmaat: There is this https://cursive-ide.com/userguide/testing.html

yeah but that 1) requires manually starting tests after every change 2) runs only the current namespace or test 3) does not reload / refresh the application state

@joost-diepenmaat: poke @cfleming in #C0744GXCJ

@joost-diepenmaat: There’s nothing like this right now, sorry, although it’s something that has been requested frequently.

So hopefully coming soon.

I was hoping there would be some workaround involving lein test-out or something similar that outputs junit xml results

https://github.com/arohner/lein-test-out

Sadly, not that I’m aware of. There may be something in IntelliJ that supports that.

I’m planning to add a proper test runner soon, though.

I’m completely new to intellij so it’s hard to figure out how all of this is hanging together. A complete test runner for clojure would be nicest ofcourse

Yes, no doubt

@joost-diepenmaat: why the switch? I've been going back and forth between emacs and Intellij myself

Mostly because I’ll be giving a workshop on clojure and the candidates are already familiar with IntelliJ and I don’t want to waste precious time teaching them Emacs

So I

@joost-diepenmaat: that was often my main reason too, interoperability between colleagues

So I’m going to use IJ for a few weeks to get myself up to speed.

also I find it easier to navigate between files/overview the whole project in Intellij, but that must be because I'm still an emacs n00b after 5 years 😉

@borkdude: I don’t think that’s just you, a lot of people tell me that.

@joost-diepenmaat: Let me know in #C0744GXCJ if you have issues or more questions.

Or just comments about things that are annoying.

@cfleming: Are you still the only one working in cursive btw?

@cfleming: thanks I will

@borkdude: Yeah, I am

I could do with some help, but future revenue is a bit uncertain for that right now. I’m going to get some contract help for specific things, probably.

can anyone recommend a simple key/value store for clojure? i basically need on-disk hash tables, low volume, easy deployment.

redis?

oh, on-disk

@bojan.matic: looks server based? i'm really looking for something that is colocated with my clojure code, in the same jvm

@bojan.matic: i don't even need concurrent access

cassandra, riak or couchdb then? haven't used any, though

sqlite maybe

datascript?

https://github.com/tonsky/datascript

@bojan.matic: thanks for trying.

@hans: slurp/spit? 😉

@borkdude: if all fails. but i'm rather amazed that something as simple as that is not just available somewhere.

Maybe I'll try Apache Derby.

@hans: No experience with it, but Immutant caching has persistance option and it shouldn't need a server.

@rauh: Isn't Immutant rather clunky to begin with?

@hans immutant.web is pretty slim. Not sure about other stuff. The infinispan (cache) jars shouldn't be too big though.

@hans: That was the previous incarnation of Immutant. They rewrote everything and now it is awesome.

@hans what do you mean available? slurp/spit was always available

@hans: in combination with edn/read-string, it's all the power you need probably

Hi all! Could someone help me, I’ve got a lot of loop in my tests, I would really like to be able to stop doing tests after the first failure of my test.

typically (doseq [x (g/sample 100 MySchema) (testing (is (= X Y)) (is = Z W)))

@hans: or what about: https://github.com/alandipert/enduro

@yogsototh: I haven't tried it, but you might be able to do it with reduce and reduced

@codonnell: thanks, I’ve never heard about reduced

If you call (reduced x) from within a reduce, it will short-circuit and return the value x

It's amazing what the atom abstraction can accomplish (thinking of Reagent and the library I just mentioned)

I'm not sure how you would extract the test success/failure, but that's the only way I know of short-circuiting a "loop" in clojure. I suppose you could also use loop-recur.

system is redesigning one of its core features, code reloading. This is a very exciting time to contribute. We currently have a challenging issue open on github. Everybody is welcome, although I have to admit that this is probably most suited for experienced Clojure developers with a firm grasp of the runtime internals. https://github.com/danielsz/system/issues/79

Hello. im loading a json in my function, extracting some parameters and assigned to a variable. When i call another function using this variable, i get the below exception: "ClassCastException clojure.lang.LazySeq cannot be cast to java.lang.CharSequence clojure.string/split (string.clj:219)”. How to overcome this?

Hello everyone, I wondered if anyone would know why this (clojure.edn/read-string "00012345") returns 5349? I looked at the source for clojure.lang.EdnReader but it’s making my eyes bleed.

@aan A leading zero on a number causes it to be read as octal.

@aan try typing 00012345 in inside a REPL

doh! Thanks!

@shreyas.n: you're trying to treat a sequence of chars as a string

'(\f \o \o) ¬= "foo"

bojan.matic: redis should do it, or even something embedded like mapdb

bojan.matic: cassandra and riak are not exactly "simple k/v stores"

😆

@bronsa : looks like it. but my origin problem seems to be that when i pass this variable (a vector) to a function, its a lazy sequence. My function does not get processed.

i was attempting to split over a sequence before. pls ignore it.

How to overcome lazy sequence?

@shreyas.n: I've finished my task using Apache Derby and it worked just fine.

@shreyas.n: but i'll have a look at mapdb, maybe next time.

For anyone wondering, yesterday when I was asking about how to get CSS/JS files found in a Compojure/Ring/Selmer app, we tried all sorts of ideas to solve the 404's I was getting. Turned out to be simple: (route/resources "/"). Don't know how I missed that. Oh, well.

how can I make this error RuntimeException Conditional read not allowed clojure.lang.Util.runtimeException (Util.java:221) go away when doing (read-string with reader-conditionals ?

hi guys, what is an efficient way to find the index of the minimum key in a seq ? some thing like (min-fn [1 23 0 9 1 -1]) ;; => [-1 5] , 5 is the index of -1 in the seq

@octo221: https://github.com/clojure/clojure/blob/master/src/clj/clojure/core.clj#L3645

@jr ahah...but i still get the error with {:read-cond true} ?

:preserve and :allow are the read-cond values

using :allow you will have to specify a feature like :features #{:clj} to read only clj

or :preserve to get the unspliced code

nxqd: here’s one way, which is O(n), which seems like the most efficient you’re going to get it:

> (defn min-fn [coll] (reduce-kv #(cond (nil? (seq %1)) [%3 %2] (> (first %1) %3) [%3 %2] :else %1) [] coll))
#’user/min-fn
> (min-fn [1 23 0 9 1 -1])
[-1 5]
>

granted, that assumes vectors

for seqs I suppose you’d need something with loop/`recur`, but perhaps someone more clever than I can figure out a way to do it with reduce, for example

(first (apply min-key second (map-indexed vector [5 3 1 0])))

@nxqd: @ddellacosta: what about map-indexed?

ah, Taylor got to it first :]

@taylor.sando: isn’t that going to go through the collection twice?

I guess it would be n^2 time.

yeah, I can’t see how you’d do it with map-indexed without making it at least O(n*2). I think you need a reduce/fold operation here regardless

What is the preferred mustache templater in clojure these days? Is it clostache, stencil or something else?

@taylor.sando, @ddellacosta how about using map-indexed with 2 atom to track index and value ? I'm not so sure about the cost of deref and reset!

or hbs?

@nxqd: do you need concurrency or just a mutable value?

@borkdude: no, not in this case

@nxqd: cause there's also volatile! which is more performant

nice, didn't know about that, will try it out

note volatile is not an atomic swap

that's why I asked if he needed concurrency. if you use only 1 thread you're safe right?

Here's my stab at it.

(defn min-fn [coll]
  (rest (reduce (fn [[index min-value min-index] x]
            (cond
              (nil? min-value) [(inc index) x index]
              (< x min-value) [(inc index) x index]
              :default [(inc index) min-value min-index])) [0 nil nil] coll)))

but you end up in imperative/mutable world if you go that route

yeah, I was imagining something more like what jjfine just posted ^

I’d stay away from atoms and whatnot when this is perfectly solvable using clojure immutable data structures

or volatile! rather

but, depends on what you’re after I guess

(vreset! (volatile! 0) 1) oh boy...

@nxqd: practicing my loop above

Oh, here's something using transducers and map-indexed, @nxqd

cljs.user=> (transduce (map-indexed (comp reverse vector)) min [1 2 3 -1 9])
; (-1 3)

reverse there is because min on vectors seems to look at the first element. With reverse, you get [val idx] out of map-indexed.

@jr afternoon tiredness - got it thanks so much

xposting from #C06GSN6R2: I'm having an issue with sending an array as a path-params request [2:11] The request looks like this [2:11] curl -X GET --header 'Accept: text/html' 'http://localhost:3000/product-api/list/by-categories/259,260' [2:11] Passing individual categories works fine, but multiple ones gets me a 404 error with exception throwing whatsoever

no exception throwing*

The other issue is that the function the service is calling works just fine

that's the endpoint

do you have to urlencode the comma?

compojure api doesn't seem to

If I put 259,260 it does

Like, in the text box

But not if I put it as it asks, one per line (in the Swagger API page)

I think the error is in the endpoint per se

If I search by one category, it goes in the function and performs

If I search by 2, it breaks

Hi, wats the best way to check if there is only occurrence of an element in a collection, is filter followed by count the right way?

I got it, I just made the service take one string and split it later

@pcbalodi: filter followed by second would be lazy. count realizes the entire seq.

@ddellacosta @taylor.sando: map-indexed is lazy, so would min-key on a lazy list still be O(N^2)? Or O(N)?

@rauh: oh okay, thanks

@fasiha: I don’t think laziness is relevant here, because you have to evaluate the entire sequence to determine which value is least

@ddellacosta: right, so min-key will definite be O(N). I'm wondering if adding map-indexed into the mix makes it N^2 or 2*N, or if it remains O(N)

@fasiha by my calculations you are doing O(n) once in map-indexed, then you do O(n) once more when you do (apply min-key second …), so O(n*2)

That would certainly be the case if map-indexed were eager, i.e., creating a new list of N 2-tuples first. But since it's lazy, wouldn't it hand min-key the elements of that new list one at a time?

Or would min-key evaluate the entire lazy sequence before proceding?

@fasiha: if all the values are realized in the lazy seq that map-indexed returns, then I don’t see how you can get past it being O(n) (map-indexed) + O(n) (apply min-key)

would like to be corrected if I’m wrong though

laziness only helps us if we aren’t doing evaluation

and the answer looks like its a no

@micahasmith: try in #C05423W6H

oh cool thx

Hi, Given the following Method signature in Java, how could I invoke it (It would be on the Singleton class)

static void 	connect(java.lang.String protocol, java.lang.String host, short port, java.lang.String user, java.lang.String password, boolean setupSSL)
          Create a connection to the specified Opsware Server.

In JRuby I do something like this to cast the proper Java types:

def initialize
      @connection = Sasync::OpswareClient
      @retries = 2
    end

    def connect
      @connection.connect("https".to_java(:string), Sasync.server.to_java(:string), Sasync.port.to_java(:short), Sasync.user.to_java(:string), Sasync.password.to_java(:string), true.to_java(:boolean))
      @connected=true
    end

nm. Found the way to cast it:

(ns cljsa.core
  (:import [com.opsware.server ServerRef ServerService]
           [com.opsware.client OpswareClient]))

(def client OpswareClient)

(defn connect []
  (. OpswareClient  (connect "https" "someip" (short 443) "user" "password" true)))

There's also the (Classname/staticmethod args) form:

(defn connect []
  (OpswareClient/connect "https" "someip" (short 443) "user" "password" true))

Thanks. Just curious, is there any way to set a property on an object. So for example right now I have this:

(defn server-filter-new []
  (let [f (new Filter)]
    (.setExpression f "ServerVO.hostName CONTAINS somehostname")
    (.setObjectType f "device")
    f))

In Java/JRUby I just access the properties directly.

So I can do f.expression=“SomeExpression"

@dimiter (set! (.-fieldName object) "some value") if the field is mutable and public.

Public fields are rare in Java libraries, the standard practice is to use setter methods as in your example.

Clojure also provides the doto macro as a syntactic convenience for this common pattern.

Thanks. This particular library has some fields that are public and missing setters.

Hey so can I get a sanity check on a chunk of code:

(def db-connection)

(defn -main [& args]
  (let [{:keys [cass]} (parse-config args)]
    (alter-var-root #'db-connection (fn [_] cass))))

alter-var-root isn't the problem, but I would consider it a potential source of problems to have db-connection be a global singleton definition.

For small code bases it probably won't matter.

But if your application grows, you may want different "connection" objects at different points in the application.

That refactoring is difficult when you have references to one global db-connection scattered throughout the code.

Agreed. It is and will probably remain a small code base, so I’m kinda okay with making it a global in this case - considered using component or mount but there’s a bit of work that would be involved in ripping apart other stuff to use it and I might not be able to get the buy in for it.

If you want to preserve some flexibility without 'Component', you could initialize the database connection in -main and then pass it to other functions as an argument.

Yeah, we do that in a lot of other places. In this case it would have to pass through several other functions that don’t use the database in order to reach the function that does. I feel like that’s almost as bad in terms of style as using a global.

Thanks for the advice, I’m gonna think on it a little more before I commit to either option.

any interest in a another arity for file-seq ?

(file-seq f :dirs|:files|:children|:child-dirs)