@didibus Looks like you can just embed the ?U flag as in #"(?U)foo": https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#UNICODE_CHARACTER_CLASS

@gws Exactly what I wanted, thanks

I have a few questions about transit. (There doesn't seem to be a better channel to discuss this) - What is the difference between rep and stringRep methods of a write handler? i.e. when would I expect one to get called vs the other? (that doesn't seem well documented on transit-format) - Is it typical / advised to implement a write handler with different rep and stringRep methods (where rep does not return a string)? - If so, do I need to implement my read handler for a given tag so that it can take either the rep or stringRep formats?

a question about write macro, can someone point me how to do the following?

(defmacro def-handler [name f]
    `(def ~name
       {:enter ~(fn [a] (f 10))}))

basically what I want to do is to: define a var pointing to a map. the value of the key is a function with wrap another function passed as second parameter to the macro

I don’t know how to quote or unquote (f 10) in above example

@aengelberg: https://github.com/cognitect/transit-java/blob/master/src/main/java/com/cognitect/transit/WriteHandler.java has some comments on the methods that look like they might explain it

how to recognize f is a function passed to macro.

@rui.yang: you are unquoting the whole fn form, when you should just unquote the f

(fn [a] (~f 10))

you'll also need to gensym the paramter

that doesn’t work

(fn [a#] (~f 10))

(defn add [a] (+ a 10))
(defmacro def-handler [name f]
    `(def ~name
       {:enter ~(fn [a] (f 10))}))
(def-handler h add)
((:enter h) 20) ;; => 30

the above codes are used to test this

the fn form you have sort of works, because you have fallen in to an edge case in the compiler

sorry

it did work

I need to use a# to gensym

but you are emitting a fn object instead of a form that when evaluated returns a fn object

syntax quote namespace qualifies symbols

unless you use the auto gensym feature, which is when you syntax quote a symbol with the suffix #

@hiredman thanks, I will have another try to see it can do what I want 🙂

(fn [~'a] (~f 10)) would also work, but is not as nice

@grzm I just ran into http://seespotcode.net/2016/08/16/figwheel-reloaded/ We came up with a different solution though. For just refresh, simply setting your refresh dirs with: (clojure.tools.namespace.repl/set-refresh-dirs "test" "src") should work, as an inclusive set of directories you want to bring in. Looks like the #boot guys ran into this sometime last year. And came up with this solution to the problem: https://github.com/boot-clj/boot/wiki/Repl-reloading#problems-with-setting-refresh-dirs Something similar in Leiningen should work, based on your directory listing functions.

It's particularly potent with https://github.com/juxt/bidi as it includes protocols and such, which with the wrong reload order breaks your entire site on refresh.

On further digging, I'm not sure about the method involving user.dir, I don't think it solves this particular problem completely. As cljs output files are in user.dir, so I stand by my original solution ("test" "src")

so I'm implementing a web app in clojure/script and I was wondering if I should use om (in clojurescript) or enlive (in clojure) for creating the pages. The website is similiar to a forum, so mostly static but some buttons and stuff to press.

Does anyone have any thoughts on what would be best?

@donyorm it depends… If you’re doing this to learn “How to write a web-app in clojure”, I’d start out with enlive, and keep clojurscript on hold for a while. If this is a production system which might want to have several clients (mobile, web, what have you), a restish kind of api would be usefull, and implementing the frontend in Om would make sense.

IMNSHO, I find that people way to often reach for spa’s when plain old html generated on the server with a wee bit of jquery would do the job perfectly.

It's kind of a mix of both. I'm definitely learning clojure, but I wouldn't mind this being actually useful. I'll probably go with enlive, since I don't think I'll be doing javacript intensive work

I've heard that jquery doesn't work with clojurescript, is that true? Should I even bother using clojurescript for relatively simple tasks?

(I've done a small web app using luminus, but I used normal JS, so I haven't looked into clojurescript as much)

@donyorm https://github.com/ibdknox/jayq

That works. Thank you!

Enlive hasn't been worked on for a couple of years, and is still using clojure 1.5. Is that something to be concerned about?

I’ve been happy with hiccup

Hiccup seemed like a ton of typing for creating a whole html page, though it seemed like it would be useful for shorter snippets

I use hiccup almost exclusively. I like how Clojure-esque it is. I’ve always disliked Selmer/handlebar-style solutions that bury code snippets inside of markup. Hiccup requires a bit more upfront work but you can compose snippets together to form full pages to keep things DRY.

yeah @akiva that's part of what I liked about om and/or enlive. But maybe I look into hiccup more then. Om was very slick, but felt like it was possibly more than I needed

I’m a fan of Om but it is heavy, especially syntax-wise, but worth the work for a massive/complex SPA. Keep an eye on Om-Next, however; it’s going to be severely bad ass. Currently, I’m using re-frame/reagent for smaller projects.

I know I'm tapping into a classic source of Java pain here, but I'm generating some SVG, and I naively started feeding literals like 10 into calculations which included division. Then my tests start failing because even when everything adds up perfectly, (not (= 10 10.0)). Is the correct move to just use float literals in every context that is not guaranteed to be ints only? I've spent a bit too long working with languages that were a bit more cheerful about converting between types...

you can use ==

not always safe as well… see http://gettingclojure.wikidot.com/cookbook:numbers#toc10

Interesting, I never knew about ==. And it doesn't surprise me that it's not perfect either... but I guess I'll use == and see what happens in real life. I doubt I'll ever be seeing numbers larger than a few thousand, since I'm just rendering SVGs of relatively small graphs. Thanks for the tips!

Bah, I'll have to extend that to collections!

(= [1 2 3] '(1 2 3)) ; true
(= [1 2 3] '(1.0 2.0 3.0)) ; false
(== [1 2 3] '(1.0 2.0 3.0)) ; ClassCastException

(defn equal-numbers? [c1 c2]
  (every? #(apply == %) (partition 2 (interleave c1 c2))))

Any common lisp wizards here? I'm trying to use cl-format to format money. I want (f 12345) ;=> "12,345.00". I get the decimals with "~$" and I get the comma separators with "~:D". How do I combine them?

Yeah, i just went and used java ¯\(ツ)/¯. #(.format (java.text.DecimalFormat. "#,###,###,###.00") %)

when 1.9.0 is no longer alpha will specs defined by clojure.core e.g. :clojure.core.specs/bindings be reliable for use? ie. i'm writing a macro and i want to support the bindings form as defined by :clojure.core.specs/bindings; can i rely on it for parsing, etc.?

(my presumption is no.)

@noprompt IIRC, I think alexmiller mentioned that yes, you could

you might want to check #clojure-spec thou

Yes

thanks @andrepnh, @alexmiller

that's good to know.

The idea is that they are public specs for core and you can build on them

I don't expect them to change dramatically

This has probably been asked before but, is there an easy way to generate urls from compojure routes? I am building a rest api and want to have links to other resources.

@jannikko do you want those links for api documentation purposes, or something else?

@andrepnh No I want to include them in my response, to link to a related resource.

And I don’t really want to hardcode them or define another function to create them

I know that bidi was created for these kind of things but I really want to stick to compojure

mm, I'm afraid I don't know how to do that 😕

have you tried #ring ?

I mean I am using compojure with ring

I use compojure to define my routes

oh, sorry

I meant looking for help at the #ring channel

Oh right 😅 thanks

I just found this https://github.com/clojurewerkz/route-one looks promising

nice, looks promising

is there a good way for documentation?

@dpsutton api documentation?

you could try something with swagger

https://github.com/metosin/compojure-api

wow impressive. thanks