No idea, but have you also looked at the Clojure solutions available? If you need to generate fake requests, there is e.g. ring-mock

I'm pretty sure that's it for now.

I believe that's a set, used as a function, like so: (#{1 2 3} 1) => 1 (#{1 2 3} 42) => nil

I believe he's referring to mathematical sets and implementations of them in clojure. Functions on sets like intersection/ union / conj / disj are simple because they are idempotent. Sets are simple because ultimately they're only about membership. I do not think he meant Seqs and all the functions that surround Seqs. Those properties of sets allow for declarative expression and manipulation of membership, whereas other data structures may require careful policing and ordering to achieve the same which leads to more complex and imperative code.

it's about what collection functions that complect what's to be done and how that's done. he pointed loop and fold as examples. although both operates on whole collection (what), both operate from first element, one-by-one, to last element (how). like when using map or filter, we don't care the how, the order of things or the order of how things work--whether the work done from beginning-to-end, end-to-beginning, or even worked in parallel. I guess Rich named those 'set functions' because sets don't have ordering in its members.

Right… I have a hard time thinking it relates to clojure.set as you can do so much more in a imperative loop/fold than what clojure.set offers

map, filter, etc are equivalent power to imperative loop/fold, but are simpler

The functions you're quoting here operate on the Seq abstraction, which is a very central Clojure thing. Maybe every seq is a set in the mathematical sense, but I doubt that was the point there.

In the Clojure core library, I think that is the most concise understandable way

Understood, thanks.

You can also do the opposite and write a maybe-cat transducer. Just copy cat's definition and add a coll? check which would branch to reduce or rf, I'll find an example later and send it if you're interested

Yes I'm interested

Something like

(defn maybe-cat
  "Like [[clojure.core/cat]] but falls through on non-sequential elements."
  [rf]
  (let [rrf (preserving-reduced rf)]
    (fn
      ([] (rf))
      ([result] (rf result))
      ([result input]
       (if (sequential? input)
         (reduce rrf result input)
         (rrf result input))))))

then just use it in a transduction

(into [] maybe-cat coll), or any other API

cljfmt, clj-kondo (both have good support for major IDEs)

clj-kondo doesn't do formatting

I saw zprint and joker do it too, but not sure how widely used they are

@U066U71AR This is a fork of cljfmt which looks pretty great: https://github.com/greglook/cljstyle by @U8XJ15DTK

thx, I'll check that out.

been a bit of a lull while I’ve been busy with other projects, but I’m planning to get to a 1.0 release later this year with better config and more options 😄

while on the subject, can puget also pprint code or is it more tuned towards EDN @U8XJ15DTK

we're spoiled with prettier, black, and ocamlformat, but trying to get clojure in now.

puget is very much about EDN/data rather than code, though it does do one or two code highlighting things

@U066U71AR @U8XJ15DTK https://bogoyavlensky.com/blog/clojure-formatting-cljstyle/ <- someone blogged today!

oh wow

hah, nice!

You don't get an error on the first attempted call to spec/fdef on add-5? I did, in my attempt to reproduce what you see.

Perhaps if you do (spec/def add-5 ::int-to-int-fn) it achieves what you want (note spec/def instead of spec/fdef)

No I got an error for both of them. Typo on my part.

I can spec/def add-5 ::into-to-int-fn without an error, but what I'm looking for to achieve the equivalent of giving :args, :ret, etc. with a single token declaring a common i/o signature

For example if I spec/def add-5, then ask for docs on add-5, the 'spec' section of the output is nil.

I do not know if there is a way to achieve what you want with spec. (I'm not saying there isn't -- just that I'm not enough of a spec expert to give a definitive answer either way)

Yeah it's starting to look like it's out of scope for spec. It'd be cool though. Thanks for your help!

You may get a more expert answer by asking in #clojure-spec channel

can you set JAVA_HOME and see if that helps?

pdfbox parent pom has a property that uses ${env.JAVA_HOME}

I think that's what's failing (and what's not failing for me because I have it set)

Unfortunately, JAVA_HOME is set. I think it’s the way the jar (a kind of Uber jar, with everything included) is being created. I may pull it apart and then reassemble. Even if I take out the pdf dependencies in the jar, I get an error about commons-io. Two funny things, the base jar without its dependencies imports fine (but doesn’t work) and the uberjar works fine in Java. Appreciate your help.

oh, that could be it - uber will sometimes strip or replace things that collide and you can run into some weirdnesses that way

there's definitely more than one way to do it. the approach that first comes to mind: • define your cake method and add some meta data with the regexp

(defn ^{:slackbot.ns/regexp #"cake.*"} cake ...)

can I lookup in a wildcard namespace? like myapp.commands.*? maybe I'd just lookup all the subnamespaces of myapp.commands.*?

it's my first clojure project so I'll have lots to learn but I figured metadata was a likely answer

you can, but it's easier if the namespaces are already loaded when you try to find the handlers

another idea I had was to make create a macro that, when called, added a regexp to defn entry to a collection of maps and then defined the defn as well?

the other option that I've used is have a macro like defslackhandler and that handler will "register" the handler in a global list. "registering" just means swapping into an atom in the slack namespace

what would be the more idiomatic way?

probably, https://github.com/clojure/spec-alpha2/blob/master/src/main/clojure/clojure/alpha/spec.clj#L440

seems like that's how spec registers specs

alright, thank you very much I'll go the macro route

the def macro translates to a register call which adds an entry to an atom

gonna be a fun exercise in demystifying macros 🙂

You can also inspect ns with ns-interns and ns-publics

https://github.com/vlaaad/reveal/blob/master/src/vlaaad/reveal.clj#L167

doesn't ns-interns require that the namespace is already loaded, not just available on the classpath?

Reveal uses that to build cli command list from defs

Yes, it has to be loaded

so will I need to "preload" all my calls to defslackhandler?

Do you think you need dynamic loading and multiple namespaces? Maybe single ns with command list would do?

Or maybe even a single def with a map...

I am reimplementing a bot with thousands of lines of ruby and 50 commands

if it's all in one file it's gonna be a mess...

I think that's fine for a single map from regexps to handlers if handlers are extracted to other namespaces

I like to keep code that works tightly together in the same file, which I why I want the regexp and the defn next to each other

you just need to make sure an load all the namespaces with handlers from the namespace that contains your main

so that I don't have to switch emacs buffers around to make modifications

can you give a few more details as to what you are trying and the error message you're receiving?

I try to start backend REPL with `lein run` and get: Can't find 'grump2.server' as .class or .clj for lein run: please check the spelling. Syntax error (FileNotFoundException) compiling at (/tmp/form-init3649709 871957213789.clj:1:73). Could not locate grump2/server__init.class, grump2/server.clj or grump2/server.cljc on classpath. And it doesn't matter where is `server.clj` file: `grump2/server.clj`, `grump2/src/server.clj` or `grump2/src/clj/server.clj`

do you have (:gen-class) in your ns declaration?

no

is it in project.clj should be?

oh seem i understood

i need add this to server.clj?

I would try that, and it's expecting the file in:

<myproject>/src/clj/grump2/server.clj

I think. if I'm reading the error messages correctly

i've created src/clj/grump2/ dir and added server.clj file and db.clj because i have import there. And get same error but now it can't find db.clj

do you have the command you're running and the error message you're getting?

excuse me

i'have fixed the error

thank you very much:grin:

now i have new bugs but it's working now and it's great

Can i write to you sometimes for help?

I'd recommend posting in #beginners. if I'm around and available, I'll try to help!

Great! Thank you 🙂