Anyone know of a terminfo/termcap library for Java or Clojure?

I’m not having much luck via Google.

is loop recur lazy?

@jtackett: No

Working on some color algorithms: https://images1.sw-cdn.net/model/picture/625x465_4133974_13340651_1449705852.jpg

That’s really nice! @meow

What are you using to create that?

@threequal: thanks. I'm using Clojure. 😉

I'm using the http://thi.ng library, my own code, output to an X3D file, upload to Shapeways, use their renderer to create a JPG.

You can see a bunch of my designs here: https://www.shapeways.com/designer/pkobrien

Hahaha. Ah right, I had a feeling that you would have been using http://thi.ng - that looks really incredible! I haven’t started mucking around with it yet

Very cool though!

They look great!

tyvm

I'm having a lot of fun creating these designs.

Cool, I have been mucking around with Overtone a lot - maybe it is time to start some visual stuff!

Now if I could just figure out how I'm sometimes getting leaks in my meshes that would be great - java.lang.NullPointerException doesn't tell me much to go on.

looks great! and I'm colourblind.

@d-t-w: thank you!

Here's one I just uploaded that you can play around with in the 3D tool: https://www.shapeways.com/model/3dtools/4134592/1/26?key=faf3fe4a5c1a0e19905868764335c760

I wish they had better 2D rendering on their site, or even better if the 3D tool was accessible to customers.

This isn't a very good 2D render: https://images2.sw-cdn.net/model/picture/625x465_4134592_13343246_1449721897.jpg

Some expert who is willing to help a beginner in the beginners channel with a problem ?

Is thee a datomic channel? Is datomic suitable for startup like twitter? (assuming it’s using dynamodb as store)

there is a #C03RZMDSH channel

suitable is a highly subjective word. i can imagine cases where Datomic can add a lot of value to a system like Twitter’s

How can I access the cause argument for ex-info? https://clojuredocs.org/clojure.core/ex-info

@robert-stuttaford: thanks.

@danielgrosse: .getCause http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html#getCause()

(try
  (throw
    (Exception. "Exception" (Throwable. "cause")))
  (catch Exception e 
    (println (.getMessage e) (.getMessage (.getCause e)))))

to access the cause of an exception, yes

I think you can turn (.getMessage (.getCause e)) into (.. e getCause getMessage) for readability.

hi guys, is there any way we can develop a macro that can do so : for example (fn), then if we add ??(fn) , it will print out the value of fn but still doesn't break the whole thing. it would be very convenient in testing 😄

cider has tooling for this, it’s called tracing

it leans on https://github.com/clojure/tools.trace#example-usage

hmm, I can see. But can we make it to be something like #_ for comment ?

you can simply alter the defn to deftrace

presumably you wouldn’t keep it traced for production use, this is for dev usage?

yes, this is for dev usage only

For example : I have this nested function (defn a [] (fn1 (fn2 (fn3)))

I want to debug the fn3 quickly,

to something like this (defn a [] (fn1 (fn2 ??(fn3)))

then I can remove the debug macro quickly later as well, I don't have to deal with brackets just like #_

are you using CIDER?

http://endlessparentheses.com/cider-debug-a-visual-interactive-debugger-for-clojure.html

i don’t use Cursive so i don’t know what debug facilities it has. perhaps someone who does can share?

that looks awesome @@

I gave up on cider since it was bloated then.

btw thanks for the link.

CIDER -ing rocks

@nxqd might want to check out https://github.com/dgrnbrg/spyscope as well

@anders: yes, it's the form I'm looking for 😄

ah, yes, totally forgot about that. infact, that’ probably exactly waht you need

I will look into it and maybe build my own thing, thanks 😄

@robert-stuttaford: thanks 😄

awesome !

no experts who wants to help a beginner in the beginners channel ?

How can I write this more elegantly and concisely? (into {} (map (fn [c] [(:id c) (certificate-name c)]) certificates))

(into {} (map (juxt :id certificate-name) certificates))

@magnars Alter Schwede! Cool, thanks

Is there a way I can tell clojure a file is in the resources directory. I use now this (def filename "suspects.csv")

@roelof: are you talking about ring application? if so, ring.util.response provides resource-response function, you can use like (resource-response "index.html" {:root "public"})

@roelof: what about ?

no, im talking about a example I found where I have to read a csv file with slurp

@roelof: resource should give you nil if it cannot be found - resource paths configuration (default + whatever) is to be kept in mind though

does an (if|when)-let exist that ands successive assignments together and executes the body if the result is truthy?

also am i crazy in saying that when generally implies side-effects?

@timvisher: not in core

for sure not in core

@bronsa: are you saying that regarding the when-let or regarding the side-effects?

i responded assuming the former

yeah

I generally use when where the else branch of an if would be a nil. Nothing to do with side effects

@timvisher: regarding when -- yeah, it's only needed because of side-effects, but I sometimes like to use it in place of one-armed ifs

some would consider it bad style, I personally like it better

interesting. i thought the when for side-effects was fairly universal

@stuartsierra: listed it only as a 'some people' option http://stuartsierra.com/2015/06/16/clojure-donts-single-branch-if

@bronsa: it's not needed for side-effects because it's semantically equivalent to (if … (do …)), right?

it is literally equivalent to (if .. (do ..))

right

but no one would debate that do implies side-effects, right?

right

but implies != guarantees

it seems like the divide would be over whether or not people are used to seeing consequent only if forms or not

well i would assume anyone reviewing this code would throw it back to me (do (+ 1 1)) or (do (prn "ohai"))

they'd immediately say "you don't need a do there. it adds nothing but some extra code"

Today's colors are brought to you by (mod (* 10 (get-in mesh [:face-area-map face])) 1)

https://images1.sw-cdn.net/model/picture/625x465_4136717_13349835_1449767579.jpg

Hi everyone, in the context of building and REST API, which sql abstraction library would you recommend to support dynamic queries (pagination, filters, sorting). Until now I was using Yesql, but it seems that I am going to need another one to support this more flexible feature.

@rcanepa: I use honeysql and it has been great for my needs so far https://github.com/jkk/honeysql

@rcanepa: I will shamelessly recommend my own: https://github.com/bsvingen/squirrel (only PostgreSQL for now).

Thanks guys, I will check both

@noonian: to be sure I understood how honeysql works, all that Honeysql does is to create SQL queries (strings), so, I have to rely on another library like clojure.java.jdbc to execute them, right?.

Yup.

You have to use either clojure.java.jdbc or clojure.jdbc to execute them (I'm not aware of any other JDBC lib).

Thanks

Though there's also non-JDBC lib - https://github.com/alaisi/postgres.async

😄

@rcanepa: From what I understand, HugsQL is supposed to be a fairly natural extension of YesQL. Caveat: I'm not very familiar with either of them.

To chime in, I've been working on a library (very new) for postgres that's similar to yesql which has support for dynamic sections. Any feedback would be very welcome. https://github.com/mikeball/foundation/blob/master/docs/templated-queries.md#you-can-also-specify-dynamic-sections

Oh, I didn't know HugsQL, looks interesting (though I still it still doesn't allow conditional evaluation in queries).

@mikeb: oh, that's interesting, but I understand this means the dynamic part lives in Clojure code not in the external file?

@jaen: Correct, the dynamic part is just a function that is passed the parameters and that returns a string that is injected into the template.

@nxqd: You should take a look at spyscope, it does almost exactly what you were looking for: https://github.com/dgrnbrg/spyscope

is somewhere implementation of java.io.Writer wrapper in clojure? I want to look at it as an example to write my replacement for out and err

After running clojure.core/load-file on a file with a (ns my-cool-ns), I have that new ns loaded and all. Is there some way to do (unload 'my-cool-ns), and reverse that action? I want to free up memory, kill threads started in that ns, etc. Wipe it from existence. Is this possible?

@codemartin: no

load-file does almost exactly the same thing as typing each form in the file into the REPL.

Have this function, which can ns-unmap every var in a ns:

Clojure
(defn unload-namespace!
  "Unloads every var in a namespace"
  [ns]
  (doseq [[sym var] (ns-map ns)]
    (if (and (var? var)
             (= (.. var -ns -name) ns))
      (ns-unmap ns sym))))

@stuartsierra: thanks for replying! And thanks for the tools.namespace lib!

@codemartin: You're welcome. There is no code which can "undo" arbitrary side-effects. I wrote http://github.com/stuartsierra/component to help structure code to cleanly shut things down.

@stuartsierra: I understand. Will look into your linked component project for some inspiration. Thanks for sharing

Another way would maybe be to remove code paths to objects, and then have the GC eat it. In Javascript you can have the GC eat something by re-defining it to undefined (or just use the delete keyword). What makes a go-block or a thread defined on global (ns) level in clj become 'dirty' for the GC?

Hi, could someone help me with github please... I am trying to do a pull request and struggling a bit. please DM me. TIA.

I got closer on my quest to “tee” stdout in clojure, using proxy, I’m able to intercept all calls to out writer like this: https://gist.github.com/darwin/0375c435ed239db7ce4a the problem is .append, single-paramter arity can receive char or CharSequence, it looks like Clojure is converting both to string for me, and when I pass it to super, it acts differently, it inserts extra newlines and spaces. Any ideas what is going wrong? btw. the underlying StringWriter’s buffer contains proper output (without extra spaces/newlines)

I guess, I need something to tell clojure not to touch my arguments in any way and just pass them through as-is

I don't usually expect any kind of coercions not related to boxing of primitives

So my gut feeling is that I'd be surprised if this was the right explanation.

it is interesting when I commend out this particular line, it works as expected for my test case: https://gist.github.com/darwin/0375c435ed239db7ce4a#file-tee-stdout-clj-L15

@pmooser: I did some extra logging and investigation of stack traces, it looks that StringWriter calls write while in the middle of append call, that ruins my original assumption and I end up writing the same content to orig-out multiple times

so your gut feeling was correct