there's clojure library FooBar, which uses JNI. There's two JNI options. CPU support and GPU support. Maven package of FooBar has CPU support. I built a local *.so with GPU support. How do I properly package up FooBar so that my local boot config picks up my LOCAL *.jar with the GPU support ?

I expect this to be a mess, so if you can point me at some docs / tutorials, I can go hash it out myself.

Emacs related question, but is there any way go get a list of definitions/functions in the current buffer or project?

for the current buffer i use M-x imenu

or you can use M-x helm-imenu if you have helm

Thanks, works like a charm, found imenu-list emacs plugin as well.

sensible testers, how do you access the test result from clojure.test after a test run via lein test, what I'm looking to do is send email/slackmsg after all tests.

I use use-fixture to correctly sequence the test, didn't try, but maybe it returns what I'm looking for...

is there an idiomatic way to write a function that will read a string per edn/read-string, but return values that get returned as symbols to be returned as strings instead?

i.e. read-string looks like (read-string "42") -> 42, (read-string "hello") -> hello

I would prefer (read-string "42") -> 42, (read-string "hello") -> "hello"

(read-string "\"hello\"") ?

the actual strings are being read in from a CSV file

a CSV without quotes 😛

tab-separated, actually

so I can’t really control the input to read-string very well, or I’d prefer not to

hmm, pass the symbol 'hello to the function name?

read-string is probably not actually what i want, looking more closely

I guess i have to try to parse the string as a number, and if it fails just return the string

@steve313 if it's number or string, then yeah, do that.

you can also use a function, not in clojure.core tough, numeric? if you only want to get the numbers out of the string and read them only.

some numbers are floats and other numbers are ints though 😞

@steve313 treat them all as float?

I think I might be able to get away with that

maybe

Clojure doesn't care about the differences.

Most of them are floats for sure

this one from rosetta stone works for floats I believe

(defn numeric? [s]
  (if-let [s (seq s)]
    (let [s (if (= (first s) \-) (next s) s)
          s (drop-while #(Character/isDigit %) s)
          s (if (= (first s) \.) (next s) s)
          s (drop-while #(Character/isDigit %) s)]
      (empty? s))))

probably easier to just catch the error from converting…

@steve313

user=> ((fn [n] (try (Float. n) (catch NumberFormatException _ n))) "hello")
"hello"
user=> ((fn [n] (try (Float. n) (catch NumberFormatException _ n))) "10")
10.0
user=> ((fn [n] (try (Float. n) (catch NumberFormatException _ n))) "10.5")
10.5

using (float n) though… is there a difference?

Oh, yes there is

that’s just a class cast exception

OK

is there a clojure built-in for compositing multiple boolean checks? i.e. (?? arg [is-x? is-y? is-z?]))

(map Boolean? [a b c])

some-fn or every-pred depending on your needs @lhall

they're combinators

every-pred is what I’m looking for. Thanks!

beware, depending on the situation it can reduce readability

I found today a really weird behaviour with insert-multi! and Redshift jdbc driver. If I give to insert-multi! two rows like [["id1" 1.1] ["id2" 2.2]], I get values 1.1 and 2.2 in Redshift. But if I give rows [["id1" 1] ["id2" 2.2]] then I get values 1 and 2 (not 1 and 2.2) in Redshift. I was wondering that this should probably not be the default behaviour (the first row is used to interpret the type of columns or something weird like that)?

can you run into the 20 arg limit of function calls with apply? I'm a little confused why (apply str (take 100 (range))) works, as i assume this is calling str on 100 args

there’s no such limit, after 20 args it takes a varargs

this is the highest arity defined, notice it ends with Object… at the end https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/IFn.java#L89

the limit is on function definition not function invocation

you can't define a function with more than 20 fixed args

but you can use varargs

ah thanks.

i.e. rather than (defn foo [a1 .. a21 a22]) you can do (defn foo [a1 .. & [a21 a22]])

ok. that's always been fuzzy in my head. thanks for clearing that up for me

hey anybody using re-frame? if so, do you know if it's usable on JVM yet?

at least the basics seems to work. the tests are not yet converted to .cljc so there could be dragons

@kaosko re-frame on JVM is only intended for testing/development, not production use

At least at the moment, we haven’t had people want to use it in prod (not sure what the use case is)

But people do use it. re-frame-test allows you to write cross platform tests too

thanks @danielcompton. I'm happily using re-frame on the client but I'm seeing a use case for it on the server as I have to keep a fairly complex load state tree in memory per user. I'm trying it right now!

ok, good luck, let us know how it goes, and feel free to open issues about it on re-frame. It's not a core use for us, but happy to take PRs on it. The architectural pattern for "re-frame on the server" is CQRS, so take a look for other CQRS systems for more inspiration

thanks, sounds good. it's a shot in the dark, but at this point I felt the alternative would have been a plain global atom, so might just as well try re-frame here

I'm trying to add some server side rendering to a pedestal+reframe project

so I just added clostache and in theory it should be quite simple

I just changed it from

(defn home-page
  [request]
  (-> (ring-resp/file-response "index.html" {:root "resources/public"})
      (ring-resp/content-type "text/html")))

(defn- get-config
  [language]
  (merge
    ENV
    {:language (str language)}
    (get TEXT language)))


(defn render-homepage
  [language]
  (clostache/render-resource
   "public/index.moustache"
   (get-config language)))

(defn home-page
  [request]
  (-> (ring-resp/response (render-homepage :en) {:root "resources/public"})
      (ring-resp/content-type "text/html")))

but with the second version Figwheel keeps on complaining that it doesn't find the resource

even though playing around in the REPL it seems all correct

any idea about what it could be the problem?

Any way I can with-redef clojure.tools.logging log/warn ?

@didibus redef clojure.tools.logging/logp

sorry, log*

clojure.tools.logging/log* is the function that all those macros eventually delegate to

Ah, ya that works

So can you not redef a macro?

I thought it would still just be pointed by the var, and so would have its macro be replaced

Oh, I guess its expended at load time, so before with-redefs runs?

guess so, I never really thought about it too hard

alright, thx