What’s the elegant way of doing something like:

(or 
  (get m :foo)
  (get m :bar)
  (get m :zap))

(some-fn :foo :bar :zap)

ah… right… thanks Dan. Maybe I should’ve said “I don’t like it (for some-fn reason)“. 🙂

I always forget about that one :)

yeah, it’s tricky because it’s kind of opposite of every-pred but the name is not similar

yeah i had to apropos it today because i couldn't recall it 🙂

The Clojure cheat sheet puts them in the same group with each other, so if you remember one, you can find the other: https://clojure.org/api/cheatsheet

Meh, who needs a cheatsheet when there are awesome people right here 🙂

I'm working on a library to be called from both clojure and clojurescript. I'd like to write unit tests in .cljc files and have them work in both clojure and clojurescript, though I expect I'd invoke them differently (via different repls or test runners). Are there examples of others doing this I can study?

08:58:24.138 INFO: ------------------------------------------------------------------------ 08:58:24.138 ERROR: Error during SonarQube Scanner execution org.sonar.api.utils.command.CommandException: http://java.io.IOException: Cannot run program "lein": CreateProcess error=2, The system cannot find the file specified at org.sonar.api.utils.command.CommandExecutor.execute(CommandExecutor.java:102) at org.sonar.plugins.clojure.sensors.CommandRunner.run(CommandRunner.java:36) at org.sonar.plugins.clojure.sensors.CommandRunner.run(CommandRunner.java:50) at org.sonar.plugins.clojure.sensors.eastwood.EastwoodSensor.execute(EastwoodSensor.java:47) at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85) at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:62) at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:387) at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:383) at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:346) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:141) at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136) at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:122) at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:72) at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:66) at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) at com.sun.proxy.$Proxy0.execute(Unknown Source) at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:189) at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:138) at org.sonarsource.scanner.cli.Main.execute(Main.java:112) at org.sonarsource.scanner.cli.Main.execute(Main.java:75) at org.sonarsource.scanner.cli.Main.main(Main.java:61) Caused by: http://java.io.IOException: Cannot run program "lein": CreateProcess error=2, The system cannot find the file specified at java.base/java.lang.ProcessBuilder.start(Unknown Source) at java.base/java.lang.ProcessBuilder.start(Unknown Source) at org.sonar.api.utils.command.CommandExecutor.execute(CommandExecutor.java:74) ... 31 more Caused by: http://java.io.IOException: CreateProcess error=2, The system cannot find the file specified Even the lein is added to the PATH variable. $ which lein /c/Users/XXXXXX/lein

This is the setup I am trying in local windows machine. and we are trying to run the sonarqube code analysis for clojure projects

:jvm-opts ["-Xmx15g" "-server"] is the memory settings in my project.clj file

Thanks in advance

I have opted into keeping the lein script in my repos, as it installs itself on the go if needed. Doing the same with gradle wrapper for java projects.

Lein bash script is pretty tiny. It fits.

And i actually want to write code and make products/services work, not spend my life configuring and tracing issues of various build agents & platforms 🙂

are nested syntax-quotes a feature or undefined territory?

(println
 `(+ 1 2 3 `(+ 1 2 3)))

Someone mentioned this code in #clj-kondo:

(defn example
  [name]
  `(defmacro ~name [& args#]
     `(foo ~(keyword '~name) ~@args#)))

if stuff gets scary then people tend to bring out pitchforks ... and this is getting slightly scary yes 😄

is there any not-too-hacky way to use an existing third-party clojurescript library (in my case com.taoensso/sente) from a client-side (webpacked) javascript (vuejs) project?

@vale you can compile the project using a small JS interface to advanced JS

and then use that from JS

I have an example here: https://github.com/borkdude/sci/blob/master/src/sci/impl/js.cljs

i'll look at that, thanks!

https://yannvanhalewyn.github.io/boyscout/ 😍

Hello, I'm trying to get a simple redirect middleware to work with compojure-api, while my middleware indeed seems to be getting called, the redirect isn't working. Any ideas? Here's what my code looks like:

(defn redirect [handler]
  (fn [req]
    (let [uri (:uri req)
          fixed-req (assoc req :uri "")]
      (handler fixed-req))))

(def app
  (api
   {:swagger
    {:ui "/"
     :spec "/swagger.json"
     :data {:info {:title "Dice-api"
                   :description "Compojure Api example"}
            :tags [{:name "api", :description "some apis"}]}}}

   (context "/api" []
     :tags ["api"]
     :middleware [redirect]

     (GET "/roll/:n/:s" []
       :path-params [n :- s/Int
                     s :- s/Int]
       :return Result
       :summary "Rolls :n dice of sides :s"
       (ok (roll-dice n s)))
     (POST "/roll" []
       :body-params [num :- s/Int
                     sides :- s/Int]
       :return Result
       :summary "Given a correct request body with keys :num and :sides, returns result of roll"
       (ok (roll-dice num sides))))

   (undocumented
    (route/resources "/")
    (route/not-found "404 Not Found"))))

@amalantony to always redirect, you could:

(defn redirect [handler]
  (fn [req]
    (see-other "")))

is there a clean way to modify multiple items at the bottom of a deeply nested series of hash-maps and sequences?

without a bunch of nested maps/updates

Hi everyone, running into a weird compiling error. Getting the following message: Syntax error compiling at (report_logic.clj:1:1). Unable to resolve symbol: ​ in this context

Is there a Zero width space in there?

it happens when I am trying to evaluate my entire project.

yes that seems to be the case

yeah, seems if i add a zero width space i get the same error. I would assume simply removing it/them it would solve the issue

My guess as to why it fails is because java doesn’t treat Zero width spaces as ‘whitespace’, and it seems that Clojure uses java’s definition of whitespace while reading files. https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L130-L132

yea, i am just a little confused as to where the error comes from... there is no whitespace as far as i can tell

it definitely seems to be there in the message you pasted. you can check by highlighting and moving the cursor with the arrow keys

Each of the empty lines in the snippet seem to contain a zero width space

@ablazevix hexdump -C or something like that is your friend.

awesome thanks guys, i'll try some things

@p-himik hexdump -C is my friend... but y'all are my best friends lol

you can try search-replace \u200B (the zero-width space)

People are temporary, CLI tools are eternal.

that's dark

removed the spaces and that seemed to have fixed it.. all tests passed

can you help me with walkable library? I managed to get a "floor-plan" that is created correctly (though i'm not sure, at least it doesn't cause an exception). I wrote a simple query:

(def my-query [{(:person/all {:limit 5}) [:person/name :person/surname]}])

[{nil [:person/name :person/surname]}]

I have values in my program that are sorted-map-by with a custom comparator. Up until now I used a reader tag to read back those values in EDN but now I want to read/write in transit. All those values have a :type metadata (say :foo). Providing a write handler with {:foo foo-write-handler} seems that it doesn’t work and I can understand why. My question is what is the preferrable approach if one wants to read/write in transit a value that has type metadata?

"doesn't work" == what ?

have you seen http://blog.cognitect.com/blog/2015/9/10/extending-transit example ?

Yes I read that. By doesn’t work means that in the handlers map

{:handlers {clojure.lang.PersistentTreeSet sorted-set-write-handler}}

I cannot provide as a key the :type metadata of the value

correct, you cannot.

transit-clj is built on transit-java, and relies on concrete classes, not metadata (as Java doesn't have it)

I know and I understand why. My question remains though, how should I approach this?

Should I wrap the value in a class or something?

use clojure.lang.PersistentTreeMap ?

hmm yeah you are right I can use that and emit a custom tag if the value has my :type metadata so as to use the custom comparator to construct the value

because t/write-handler accepts a function that given the value returns the tag to write for that value

thanks @alexmiller

Quick question: What's the tool of choice for namespace dependency graph visualization?

I don't know which is best supported or featureful/working, but these exist: https://github.com/walmartlabs/vizdeps. https://cljdoc.org/d/lein-hiera/lein-hiera/1.1.0/doc/readme

can anyone recommend a way to get a value out of a hash-map? I tried (vals #{:shoes}) but i believe vals only works on maps

Value out of a set or a hash-map?

sorry, I meant hash-set #{:shoes}

Could you provide a slightly more detailed example? Are you trying to convert a set into a list/vector?

I have a map in which there is a KV pair :interests {#:shoes} :interests {#:clothes} :interests {#:watches}

im slurping out interests, and the values are coming out as {#:shoes} {#:clothes}

instead would like to have them come out as strings

was thinking of doing that with mapping vals but that won't work I think

You could just call seq on the set.

But the set itself is a collection, so you can pass it to map.

(map name #{:shoes :pants})
=> ("shoes" "pants")

right on, thanks gentleman

newbie question -- how often do you use seq?

all sequence function seq their input, so generally you don't need to use it that often

I mostly only use it for checking whether some collection or sequence is non-empty...

^^

good to know! thanks again folks

I just searched our codebase for calls to seq (90K lines of Clojure) and there are maybe half a dozen places where we call seq outside of a conditional context (`if`, when, etc) -- and those half dozen are all in really old code and seem to be unnecessary so they could be removed... indicative of days when we were still very new to Clojure!

Is it possible in Java (and thus Clojure), from a Java program running in a TTY, to run a subprocess with access to that same TTY (or some kind of pseudo-terminal to the same effect, so that the user can interact with that subprocess as though it were running in the same TTY)?

The closest I've gotten is using ProcessBuilder.inheritIO, but that just redirects stderr, stdout, and stdin, without giving real terminal access to the subprocess (vim, for example, will warn that "Output is not to a terminal" and "Input is not from a terminal" and will not be usable).

Is there a way to get :extra-deps to resolve using :default-deps ? Usecase is I want to have an eastwood alias across many modules, but I don’t want to repeat the eastwood version

@favila You want :override-deps for that, not :default-deps

Then you can say :extra-deps {some.group/artifact {}}

(which is what we do at work)

I don't think :default-deps really works...?

I need help with the following. I am composing transducers. The input data is a vector of tuples of three things: an integer, a string and a map. The first couple of transducers in the composition reshape only the maps and leave the integers and the strings unchanged. Only the last transducer combines all the data. I managed to do this, but I wonder if there is a better way. If the composition were a defn, I would use let to put the unused string and integer aside; alas transducer compositions are defs.

Are you re-using this transducer chain on a lot of different datasets? Otherwise just make a function out of it.

@nick.romer what specifically would a defn do here that a def wouldn't be able to?