I have a test case that occasionally fails, but i don't think i introduced any randomness, could someone help me take a quick look?

https://pastebin.com/PCaXFq0k

seems like for the test to consistently pass, I have to (:import [ UnknownHostException]) before referring to UnknownHostException in the test

previously in the (thrown-with-msg?) form, i just directly said (thrown-with-msg? java.net.UnknownHostException ...) directly

I have a function erroneously called to-json, which takes a Datomic entity and simplifies/denormalizes it such that it's easier to consume from dumb clients (dequalifies keywords, expands subentities, translates i18n entities depending on user's language, removes sensitive attributes...) What would be a better name? denormalize? simplify? dumbify? output? Naming things is hard.

I usually use an arrow for conversions

datomic-clj->json

idk haha

you could also consider represent-json

as in, it's a representation for dumb clients

represent-dumb

json has some sense but at the same time it has nothing to do with json

particularly when I use transit, not json ... 😂

yeah idk, I guess it depends on how far reaching

I think I will go with ->client or smth, until I find a better one : p

I ran into the same issue for conversions between clj and a database... I still think about the naming conventions as being incorrect haha

oh man...

serialize

hey, I need to attach a java annotation to a clojure function. Do I need gen-class or deftype for that?

Why can’t I evaluate this in a clj repl? (It works in figwheel cljs repl.)

#?(:clj  "clj"
   :cljs "cljs")

(I get RuntimeException Conditional read not allowed.)

Does Clojure support DTrace like in this like https://en.wikipedia.org/wiki/DTrace said,

With a supported language provider, DTrace can retrieve context of the code,
including function, source file, and line number location. Further, dynamic
memory allocation and garbage collection can be made available if supported by
the language. Supported language providers include *assembly language*, *C*, *C++*,
*Java*, *Erlang*, *JavaScript*, *Perl*, *PHP*, *Python*, *Ruby*, *shell script*, and *Tcl*.

Application providers allow DTrace to follow the operation of applications
through system calls and into the kernel. Applications that offer DTrace
application providers include *MySQL*, *PostgreSQL*, *Oracle Database*, *Oracle Grid
Engine*, and *Firefox*.

I am running into a problem running 'lein repl' where after adding amazonica to my project.clj, 'lein repl' fails with 'CreateProcess error=206, The filename or extension is too long'

Anyone have ideas how I should configure jvm opts to fix this? I noted that amazonica pulled down a zillion more jar files and probably blows up the command line call lein is making behind the scenes, but I doubt it's specific to amazonica as a google search shows this problem popping up in lots of other contexts.

@bob592 is that on Windows?

@gklijs Yes. 🤪

You could try have your root folder at a higher level, not sure if there are better solutions.

does anyone know a good clojure boilerplate project for server side? with endpoints and all..Ideally that uses datomic.

Try #luminus, you can setup a project with some options

http://www.luminusweb.net/docs/profiles.html

@gklijs Is there a known limitation in terms of classpath length, and does it affect some operating systems (Windoze!) and not others?

@gklijs I can rename my project and what-not to have a shorter root name, as I imagine that adds up, but it would be nice to know how to compute the maximum # of jars I can add to my classpath. This can be a serious restriction unless there is a sensible way around it.

@bob592 it's not about number of jars. It's about the code that's generated.

Hello! Is this project https://github.com/Datomic/codeq now abandoned? Are there any other similar ones (whcih perform git repo [possibly of a Clojure project] analysis in general)?

@bob592 See https://dev.clojure.org/jira/browse/CLJ-1852

Why does adding 'amazonica' make it blow up but not anything else? I can only imagine it has to do with the huge # of jars it imported as dependencies.

I don’t see any evidence that CLJ-1852 is the culprit here. Could be, but could be something else too. Have you tried just printing the classpath with lein classpath and using Java directly?

Anyone know a macro(?), which checks not a general expr, but has access to last result: (let [x (expr)] (when (f1 x) (let [y (expr2 x)] (when (f2 y) (expr3 y))))) => (cond-result-> (expr) f1 expr2 f2 expr3)

@alexmiller This is far from scientific, but without 'amazonica' 'lein classpath' fills up ~4.25 pages of a new default Google doc. With 'amazonica' it fills a full 9 pages. So, 'amazonica' slightly more than doubles the size of my classpath with all its dependencies.

did you try using that classpath to run java -cp <classpath> clojure.main ?

without amazonica, happy. With amazonica, an error as above.

is there more to the error? stack trace?

Resolved to sift through it after dinner.

the big difference is lein repl is first trying to compile a CLJS front end (due to my configuration in project.clj). So the path to doom is slightly different as it's invoking the CLJS compiler when this happens via 'lein repl'.

Is there a clojure.walk/postwalk-replace that only replaces the first instances found and leaves the rest untouched?

Hi! I would like to write a very simple REPL in Clojure, taking arbitrary string input (not clojure syntax). I wrote a 5 lines function looping over read-line, but it doesn’t handle left/right arrows (rlwrap). Is there any way I can add support for this easily?

Or is there a library to do this?