Oh, cool. I like that.

Mind if I use that @ghadi?

Be my guest

It could use transients to go faster

Is there a cleaner way of building up a stack of transducers where sometimes you want to disable some transducers?

(into []
      (apply 
       comp
       (remove nil?
               [(map inc)
                (when false
                  (map inc))]))
      (range 10))

I've used something analogous to cond for conditionally doing transducers stuff, it took a bunch of predicates and transducers and only called the reducing function if the predicate matched. That is conditional per item, instead of conditional upfront on the whole pipeline. And I don't entirely recall the implementation, it might have been tricky

Hi all! I'm having trouble with setting up my mixed clojure/java project with leiningen. Is this the channel to ask this sort of stuff? 😅

yes 🙂

great! so the thing is, I've already followed the guide on https://github.com/technomancy/leiningen/blob/master/doc/MIXED_PROJECTS.md and I've been able to run/compile my project with lein javac, lein run and lein compile. However, when running lein uberjar, I get a bunch of errors about missing dependencies during the javac phase (note that it works when I run lein javac on its own). It looks as if during the uberjar phase dependencies were not available to the java compiler...

any ideas?

nevermind... figured it out! I had my dependencies declared unde the :dev profile... 😅

good ol’ rubber ducking, the solution to most problems 😄

I'm trying to AOT this file, but I'm getting a warning on .val being unresolved when I start lein repl: https://gist.github.com/borkdude/d85586985aa264431b3b10a794f97602

Not sure why. Any help would be appreciated.

is the double definition an attempt to forward-declare the class for the addVar type signature?

yes

that won't work

what's the proper solution to that?

don't use genclass

you mean... write it in Java?

yep

if I were to use tools.deps instead of lein, how would I compile the java, using a bash script I guess?

btw the code does work when calling from Java

lein must be doing something funky if that code compiles

[~]> cat test.clj
(ns test)
(gen-class :name test.C)
(gen-class :name test.C :methods [["m" [] test.C]])
[~]> clj
Clojure 1.10.1
user=> (compile 'test)
Unexpected error (ClassNotFoundException) macroexpanding gen-class at (test.clj:3:1).
test.C

I actually got this solution from stackoverflow and it was marked as the accepted answer https://stackoverflow.com/questions/29329798/clojure-gen-class-returning-own-class so maybe someone should comment there 😉

I think it may work in lein cause lein adds the compile-path to the classpath

but even if you manage to somehow compile that, you'll get into all sorts of weird scenarios

as you're seeing

yeah, I'll go the java route. thank you

np

TBH genclass could be extended to handle this scenario

deftype supports it

altho it requires quite a bit of ugly boilerplate during compilation (there's some double compilation involved)

genclass is pretty limited if it doesn't support this

mainly useful for creating an invokable main probably

genclass is not a very useful good construct IMO :)

usually takes longer to understand the correct incantation to do something than it takes to generate a proxy class in java manually

lesson learned 🙂

is anyone aware of a library that provides 'reverse destructuring` ? What I have in mind is something like this: (structure (range 8) [[[] []] []]) => [[[0 1] [2 3]] [4 5 6 7]]

that's neat but i don't see any information conveying to put 2 in the first two vectors

is takes a sequence and a data structure and returns the sequence conformed to the given structure

so [[[0 1 2] [3 4]] [5 6 7]] also fits that shape?

- @dpsutton true, I've assumed an even fit there

- I guess there're many solutions

another example:

(structure (range 8) [[[] #{}] {}])
=> [[[0 1] #{3 2}] {4 5, 6 7}]

and I imagine it could also be made to work with predicates like odd? etc too

so that would error on (range 9)

yes

it would truncate I guess, or pad with nil

you could look into meander. quite possible to do it there i think

@dpsutton I didn't know about Meander - thanks!

Hi! Is there a better way to get the max of a collection of Comparable elements than Collections/max (which sadly fails on empty cols)? Thank you!

is there a way to tell slurp / input-stream not to follow 302 redirects?

w.r.t. http calls

I'd use the underlying JVM API via interop or a proper http lib, I am sure it's not an explicitly supported option

clj-http would make that pretty easy

(http/get "" :redirect-strategy :none) appears to be the thing

cool. the clj-tagsoup lib I’m using uses slurp under the hood I think, but I’ll just do the fetching myself and pass it as a string I guess

ouch, someone fix clj-tagsoup if it depends on slurp

maybe you could also get an inputstream from a proper http lib and slurp would do the right thing with that, but agreed, building on slurp is weird

i don't see slurp in that lib

@noisesmith is that last committer

https://github.com/nathell/clj-tagsoup/blob/master/src/pl/danieljanus/tagsoup.clj

haha, honestly I forgot I contributed to that project - I was fixing a bug at work and passed the fix back upstream

https://github.com/nathell/clj-tagsoup/blob/master/src/pl/danieljanus/tagsoup.clj#L52

I should have changed that try/catch into with-open while I was at it

hey) do we know of a project to generate wieldy java classes from namespaces? just a facading proxy java class with all static members. I know about implementing interfaces, so I’m asking specifically on this code gen.

@ognivo what about :gen-class?

If I want to try to load a namespace and catch an exception if it’s not available, which is the best exception to catch? FileNotFoundException?

reminds me of:

user=> (requiring-resolve 'foo/bar)
Execution error (FileNotFoundException) at user/eval166 (REPL:1).

or just require for that matter.

CLJS seems to throw an ExceptionInfo

Yes, I only care about Clojure in this case.

If I (require 'foo.bar) I get FNFE, but I wasn’t sure if that was always the case - there are a lot of paths there.

clojure doesn't do java code gen - I sure somebody has a lib out there somewhere that does it, but clojure generates jvm byte code directly

horrible idea: pass the clojure code through the ClojureScript compiler and then squint really hard because JavaScript is almost Java 😛

lol @borkdude have you looked at: https://github.com/EwenG/badigeon ?

@sogaiu haven't check it out, but will now