The getting started pages for Clojure are kind of a balancing act between different ways of doing it. Can you build your own JAR and run that? Sure, and there might be a few projects that do so. I expect it is rare to go that path, though.

Is copying and pasting from the editor to the term the standard way of using Clojure ?

No. That's why you want REPL integration with your editor.

Then you can just press some key combination and the expression at the cursor is evaluated into the REPL that you have connected to your editor.

Or use code runner extension in VSC ?

Calva is the preferred extension for Clojure in VS Code.

https://marketplace.visualstudio.com/items?itemName=betterthantomorrow.calva

So, Atom outputs to the terminal and VSC to its own console ?

Atom with Chlorine displays evaluation results inline inside the editor (and in the "Console" panel that is opened when you connect to a Socket REPL).

(Atom with ProtoREPL also displays results inline and in the REPL panel)

Looking at Calva's GitHub repo, it also shows evaluation results inline in the editor.

And the only way to run clj code in terminal is either interactively or copy / paste ?

clj can run Clojure programs -- not sure if that's what you're asking?

I am used to navigating to the file location and running the source file

If you start a REPL in a terminal, one that is outside of any editor/IDE environment, then you can either type into it, or copy/paste, are the main options I know of.

Which can be done, but is often not preferred, because of the inconvenience for interactive development.

I see : Calva Clojure Formatter , better than tomorrow. I think this is the new one

You can also start programs that were written in Clojure, programs that you do not interact with using a REPL at all, just like a "normal" running program in C or Java.

Example of creating a clj project and running the -main program:

(! 584)-> clj -Sdeps '{:deps {seancorfield/clj-new {:mvn/version "RELEASE"}}}' -m clj-new.create app paul.gureghian
Generating a project called paul.gureghian based on the 'app' template.

Wed Jun 26 17:15:26
(sean)-(jobs:0)-(~/clojure)
(! 585)-> cd paul.gureghian/

Wed Jun 26 17:15:37
(sean)-(jobs:0)-(~/clojure/paul.gureghian)
(! 586)-> clj -m paul.gureghian
Hello, World!

Wed Jun 26 17:15:59
(sean)-(jobs:0)-(~/clojure/paul.gureghian)
(! 587)-> cat deps.edn
{:paths ["resources" "src"]
 :deps {org.clojure/clojure {:mvn/version "RELEASE"}}
 :aliases
 {:test {:extra-paths ["test"]
         :extra-deps {org.clojure/test.check {:mvn/version "RELEASE"}}}
  :runner
  {:extra-deps {com.cognitect/test-runner
                {:git/url ""
                 :sha "76568540e7f40268ad2b646110f237a60295fa3c"}}
   :main-opts ["-m" "cognitect.test-runner"
               "-d" "test"]}}}

Wed Jun 26 17:16:03
(sean)-(jobs:0)-(~/clojure/paul.gureghian)
(! 588)-> 

(! 588)-> cat src/paul/gureghian.clj 
(ns paul.gureghian
  (:gen-class))

(defn -main
  "I don't do a whole lot ... yet."
  [& args]
  (println "Hello, World!"))

If you run a Clojure program that way, then you are limited in how you can interact with it and debug it to traditional methods, like printing or logging intermediate results to see what the program is doing.

Here is my Github repo. going to add some Clojure code soon. https://github.com/paulgureghian

At the risk of burying you with too many possibilities, sometimes people take advantage of starting a Clojure program on a computer somewhere, and give it command line options so that the program is "listening" on one or more TCP ports for incoming connections. Some other client program that connects via those TCP ports can then get a REPL session to send Clojure expressions and evaluate them inside of that program.

I have a good idea on my next steps

I have picked up some good tips in this Slack group

Any thoughts on the Nightcode editor ? thumbs up or thumbs down ?

I think it's good for learning/getting started. I think people "grow out of it" fairly quickly tho'

Careful with the REPL 😉 , I'm suffering from this: https://clojure.org/guides/repl/guidelines_for_repl_aided_development#_dont_get_carried_away_by_the_repl

BTW, read that guide, its really good - https://clojure.org/guides/repl/introduction

How to run this clj file ?

You’ll get a null pointer when you do. You’re invoking the return of a println which is nil

Working from this tutorial. https://www.tutorialspoint.com/clojure/clojure_basic_syntax.htm

the parentheses in that file don't completely match up. Having an editor that immediately shows you, e.g. via highlighting, which parenthesis in the file matches the one your cursor is next to, or colors them with different colors for matching pairs, are very useful when editing Clojure programs.

Wow, there are so many things wrong with that tutorialspoint stuff 😞

@paulgureghian I would stop trying to follow that tutorial. Lots of problems with.

Do you have terminal in your Atom on Mac ?

The code is full of errors and very bad practices and the text is just plain wrong in many places.

@paulgureghian I'm not sure what you're asking.

In Atom on Windows there is a terminal menu option. do you have a terminal in your Atom on Mac ?

My Atom on Windows does not have a terminal menu option.

Perhaps it's because of a package you installed?

Atom on Windows

Does your Atom on Mac have a term ?

I'm not at my Mac to check. I don't remember seeing a terminal menu option tho'.

How to use the repl integration in Atom now ?

Did you look at the Chlorine package I suggested?

I installed it

OK, so you start up a Clojure REPL -- or any other Clojure-based process -- with the option that starts a Socket REPL and then you ask Chlorine to connect to that Socket REPL. Then you can evaluate the code in the editor into the connected REPL.

The page I linked you to for Chlorine shows you how to start Clojure processes with a Socket REPL.

The keymap listed on that Chlorine page is a useful starting point -- but you can customize Atom any way you want for binding keys to commands.

@paulgureghian If you want to see some of what my workflow looks like with Atom and Chlorine: https://www.youtube.com/channel/UC8GD-smsEvNyRd3EZ8oeSrA

You just got a new subscriber

I use REBL as well, but the basic mechanics are the same. I use clj to start processes with a Socket REPL running, I connect Atom/Chlorine to that Socket REPL, I evaluate code in the editor and it is evaluated in the REPL -- you see the results inline in the editor (as well as the Console panel in Atom), and also in REBL 🙂

Ill take a look tomorrow

You're on the same TZ as me, BTW, so I'll be here all night as they say 🙂

(but I'm about to go feed cats and probably pop to the liquor store for some beer)

Im in LA

clojure
; Kinda dumb question
; I noticed there are quite a few interfaces w/ single function
; that look like the one below
;
; method :: 'a -> 'b

(defn reify-consumer
  [func]
  (reify Consumer ; macro out this
    (accept ; macro out this
      [this thing]
      (func thing))))


; So im trying to write a Macro that does this
(defmacro reify-basic
  [interface method]
  `(fn
     [impl]
     (reify ~interface
       (~method
         [this arg]
         (impl arg)))))

(macroexpand (reify-basic Consumer accept))

thanks!

im runnin into some errors with trying to implement this macro, the error messages are kind of incomperhensible to me

can somebody pro please tell me if im am missing an escape

sorry if this is a dumb question

spent a long time on it

It's not a dumb question. Macros are hard.

First off, macros will expand simple symbols to qualified names by default -- which is fine for references to core functions etc, but isn't what you want you want for "local" symbols within the generated code, such as function arguments.

For local symbols, you need what's called "gensym" -- in this case impl and arg both need to be impl# and arg#

ohh

i see

Since you're not using this in the reified function you can use _# for that -- if you actually needed it to expand to the literal this symbol, you'd need ~'this I think (I'd have to try that out)

oh thank you so much sean

you are so helpful!

hope you have a great night, you just save me a lot of time!

Happy to help. I'm just hanging out, watching AGT, with my wife, my cats... and my laptop 🙂

What’s AGT?

AgentOfGreaterTronto

*just kidding, no idea

America's Got Talent. Don't judge me 🙂

Haha own it. We’re watching dark on Netflix. Super good

Dark is amazing! We started S2 the other night and got 3 eps in.

(and we should probably take this to #off-topic 🙂 )

hey is there ways to improve jdbc inserts i'm using insert-multi! while using async/thread to create parallelization of inserting data into postgres which each batch is about 1000 running in a 16 cpu core

i feels is too slow

since its taking 10-15 min to insert about 1.3 million records

records are not big

@javiergonzalez7 Have you added the Postgres-specific flag that makes that JDBC driver behave properly with insert-multi!?

https://clojure.atlassian.net/browse/JDBC-174

oh nope

Unfortunately the auto-generated docs are not running at the moment so the 0.7.9 release is not reflected on http://clojure.github.io

oh ok gotcha

thank you

Fortunately cljdoc has the latest https://cljdoc.org/d/org.clojure/java.jdbc/0.7.9/api/clojure.java.jdbc#insert-multi!

(and it's in the very long docstring for insert-multi!)

bumped on clojure site - lmk if that looks better

Thanks @alexmiller! Yup the 0.7.9 release, with the improved docstring, is showing up now!

Including the specs -- nice! -- first time I've seen it show those, which is interesting because they're in a separate, optional namespace.

if only there were spec docs :)

how does async/threads behave with hikari connection pool

do all threads share the same connection pool or each one creates each

since i'm using mount for the connection pool database

@javiergonzalez7 My understanding is that Mount uses global Vars for state so they are singletons shared across all threads.

oh awesome

What would be a solution for (defn [uuid] [:foo #uuid uuid]) ?

That's not par-sable, going to call read-string

that is not how reader literals like #uuid owrk

don't do that

use java.util.UUID/fromString

#uuid is a tag for literlas, you do not have a literal

ah, thanks

Guys, how can I add a String to a java.util.ArrayList in clojure? Like this?

Lists.newArrayList("Aaaa")

@d.ian.b Is that using Guava?

user=> (def l1 (java.util.ArrayList.))
#'user/l1
user=> l1
[]
user=> (.add l1 5)
true
user=> l1
[5]

Sorry, you asked about a string, not an integer. But take that example and replace the 5 with "Aaaa"

@d.ian.b You can create an ArrayList from a Clojure collection, if that helps:

user=> (java.util.ArrayList. ["Aaaa" "Bbbb"])
["Aaaa" "Bbbb"]
user=> 

yeah! It helped me. Thanks!

also, often you don't need an ArrayList specifically, and the API can use any List - and clojure's [] already is a java.util.List

Hey guys I have a slight problem, when I try run lein repl in my project it keeps saying this: Error loading cider.piggieback: Could not locate cider/piggieback__init.class, cider/piggieback.clj or cider/piggieback.cljc on classpath. Any idea how to get around this? I've tried running lein deps but that doesn't seem to do anything

my guess is a bad nrepl-middleware setting in .lein/profiles.clj

basically you set things up to always try and run cider.piggieback middleware for all projects without setting it up as a dependency

if you actually want piggieback (it provides a cljs repl over nrepl) it should probably be coming in via a plugin

if you don't, I agree with @hiredman above

I've had to switch computers recently... it used to be working before. I did a clean install of Leiningen and Emacs In Emacs when I launch cider-jack-in-cljs I get strange behaviour - hot reloading and everything works but if I try switch to REPL it says no cljs REPLs found

No cljs REPLs in current session "proj-name:localhost:43894" to be exact

OK, so it sounds like you do want piggieback middleware and that's a missing dep

Look in your buffers list for the clojurescript repl. The connection is kinda dumb and only sees the last one.

I have :repl-options to include the piggieback middleware like so {:nrepl-middleware [cider.piggieback/wrap-cljs-repl]} But when I check my buffers I only see a clj buffer and not a cljs one

well the error you started with is explicitly telling you why you aren't getting a cljs repl - it can't find piggieback and afaik you can't have a cljs nrepl without it

Cider should inject piggieback for you if you’re on a recent version. Can you come to #cider. I can help in 10 minutes if you don’t figure it out beforehand

Yeah sure, I'm still trying to figure it out T_T

Do you see a repl buffer? Maybe one that says pending?

I can't see one

Ok. Look in Messages buffer and you should see a message from CIDER showing it’s startup command. Can you see that?

yeah I can see things in the messages buffer, the latest one says Direct connection to localhost established