#clojure log - Aug 29 2014

The Joy of Clojure
Main Clojure site
Google Group
List of all logged dates

0:00 justin_smith: akj: a better definition (I think): (defn split-seq [pred coll] (lazy-seq (when (seq coll) (let [coll (drop-while pred coll) [leading remaining] (split-with (complement pred) coll)] (cons leading (split-seq pred remaining))))))

0:29 akj: just_smith: thanks! that works perfect

1:30 echo-area: Is it true that updating existing values by adding cannot be used with prepared statement in jdbc?

1:30 E.g. UPDATE table1 SET value = value + 1 ...

1:33 justin_smith: echo-area: http://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html

1:35 echo-area: http://clojure.github.io/java.jdbc/#clojure.java.jdbc/db-do-prepared

1:36 echo-area: justin_smith: I tried this: ["update testtable set value = ? ..." "value + 1"] but it obviously won't work

1:37 justin_smith: clojure.java.jdbc also has prepare-statement to create a preparedstatement object

1:37 kqr: echo-area, why not just "UPDATE table SET value = value + 1"?

1:38 justin_smith: you can use a preparedstatement instead of a string

1:38 kqr: echo-area, you don't need any question marks to do that

1:38 echo-area: kqr: Yes a non-prepared statement will work. I wonder if it's possible to make it prepared

1:39 justin_smith: echo-area: yes - use prepare-statement to create it out of the string, then provide that to the db function instead of the string

1:39 kqr: what does it mean for you to "make it prepared"?

1:39 you don't *have* to have question marks in your prepared statements

1:39 echo-area: justin_smith: I tried to provide "value + 1" but it won't work

1:40 justin_smith: echo-area: don't provide anything

1:40 just use the prepared-statement function

1:40 kqr: and then executeUpdate

1:40 echo-area: justin_smith: How would I provide a value meaning "the current value in the database, plus 1" later?

1:41 justin_smith: echo-area: with the standard sql syntax

1:41 kqr: echo-area, by constructing the query statement later

1:41 echo-area, when you know that you want the current value + 1

1:41 justin_smith: kqr: no, you can construct the prepared statement, and run it later

1:41 kqr: that's even better

1:42 I haven't had my morning coffee

1:42 echo-area: Hmm, so is it not possible to map statements without a query statement directly into prepared statement?

1:43 kqr: I think it might help to explain what you are trying to do

1:43 rather than how you are trying to do it

1:43 justin_smith: echo-area: a prepared statement is just a statement you compile once and re-use, if it doesn't need parameters, all the better

1:44 echo-area: I am trying to translate thread 1 and thread 2 codes in this link http://ronaldbradford.com/blog/understanding-innodb-mvcc-2009-07-15/

1:45 justin_smith: echo-area: OK, that's showing stored procedures, which are similar to prepared statements in their advantages, but are not the same thing at all

1:47 echo-area: justin_smith: But code of e.g. thread 1 is not stored procedure

1:47 justin_smith: sure, and you can make a prepared statement with exactly those contents

1:47 you don't need to parameterize it or provide arguments

1:49 echo-area: Do I need to replace "f2 + 200" with a query statement?

1:49 justin_smith: just construct the whole thing, you don't need to parameterize it at all

1:49 think of it as a function that takes no arguments

1:50 kqr: stm = preparedStatement("update table set f2 = f2 + 200");

1:50 executeUpdate(stm);

1:50 something like that

1:50 justin_smith: kqr: if you turn camelCase into snake-case and prefix(calls) into (nested calls) that may even work as is

1:51 or very close to it, modulo some connection arguments and such :)

1:51 kqr: yeah I think it operates on a database object of some sort

1:51 justin_smith: (execute! connection (prepare-statement "sql goes here"))

1:52 kqr: it's a config describing how one gets a connection

1:52 kqr: ah

1:52 justin_smith: it can contain a map of authentication data and a URL, or have a keyword with a connection pool, or a few other options iirc

1:53 kqr: was a while since I did database stuff in java

1:53 justin_smith: clojure.java.jdbc is a bit more lispy than regular jdbc too

1:53 kqr: that's nice

1:54 justin_smith: kqr: iirc the java api has setters for a connection object, while the clojure version takes an immutible config (which may have a mutable java thing like a pool hiding inside)

1:54 kqr: depends on what you mean by setters, but you inject arguments to a prepared statement with setters

1:55 don't remember any particular setters for the connection, but that might just be me not using the more advanced features

1:55 echo-area: Yes that was what I did and it succeeded. What if I want to e.g. parameterize f2 here?

1:56 justin_smith: than you would create a paramaterized statement and provide the apropriate arguments?

1:56 kqr: echo-area, parametrize f2 or the value of f2?

1:56 echo-area: f2

1:58 justin_smith: But the supplied value can only be constants

1:58 kqr: that's an unusual use case

1:58 so I don't know if it's possible with a preparedstatement at all

1:59 justin_smith: echo-area: the point of a prepared statement is that it be pre-compiled / pre-optimized. If the row you operate on is a variable, how much do you think it can really pre-optimize that?

1:59 s/row/column, sorry

2:00 echo-area: Okay, got it. Thank you both

2:00 justin_smith: OK, I'm staying logged in, but turning in for the night

2:01 echo-area: :) Good night then

2:01 kqr: echo-area, what you could do if you need to parametrise on f2 is make "field" a column in the database

2:01 echo-area, and set e.g. field=f2

2:02 not exactly that because that wouldn't work as expected, but I think the idea is that you might have the wrong DB structure if you need to do that

2:09 echo-area: kqr: I see

2:15 mi6x3m: can someone explain why this happens:

2:15 (def f #())

2:15 (= (with-meta f {:a 0}) (with-meta f {:a 1])) gives false

2:20 TEttinger: ,(def f #())

2:20 clojurebot: #'sandbox/f

2:20 TEttinger: (= (with-meta f {:a 0}) (with-meta f {:a 1}))

2:20 ,(= (with-meta f {:a 0}) (with-meta f {:a 1}))

2:20 clojurebot: false

2:20 TEttinger: hm

2:20 ,(= f (with-meta f {:a 0})))

2:20 clojurebot: false

2:20 TEttinger: ,(= f f))

2:20 clojurebot: true

2:21 TEttinger: (doc with-meta)

2:21 clojurebot: "([obj m]); Returns an object of the same type and value as obj, with map m as its metadata."

2:21 TEttinger: ,(let [f {:blah :foo}] (= (with-meta f {:a 0}) (with-meta f {:a 1}))

2:21 clojurebot: #<RuntimeException java.lang.RuntimeException: EOF while reading>

2:21 TEttinger: ,(let [f {:blah :foo}] (= (with-meta f {:a 0}) (with-meta f {:a 1})))

2:21 clojurebot: true

2:21 TEttinger: woah

2:21 fn metadata is different from object

2:22 brehaut: ,(with-meta 1 {:a 1})

2:22 clojurebot: #<ClassCastException java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IObj>

2:22 brehaut: ,(with-meta (Object.) {:a 1})

2:22 clojurebot: #<ClassCastException java.lang.ClassCastException: java.lang.Object cannot be cast to clojure.lang.IObj>

2:25 brehaut: (let [a #()] (= a a))

2:25 ,(let [a #()] (= a a))

2:25 clojurebot: true

2:25 brehaut: oh but that will be identity based

2:26 ,(let [a #() b #()] (= a b)) ;; obviously

2:26 clojurebot: false

2:26 brehaut: two identical functions created at seperate times are not equivalent because turing completeness

2:26 and attaching meta data is a pure operation

2:28 ,(let [a #()] (= a (with-meta a {:a 1})))

2:28 clojurebot: false

2:33 TEttinger: dammit alan how much of clojure did you break with your turing completeness!

4:50 noncom|3: if i am to create clojure datastructs from within java code, do i prefer using classes which are named "Persistent*" like "PersistentVector" and such ?

4:51 lgrapent`: noncom|3: You should use the Java API http://clojure.github.io/clojure/javadoc/clojure/java/api/package-summary.html

4:52 noncom|3: lgrapent`: oh, how nice! i forgot about it being around

4:54 lgrapent`: however, there is still a question - if i have a java method that shoudl return a clojure [], then what do i say for the return type?

4:54 is it clojure.lang.PersistentVector ?

4:54 amalloy: noncom|3: c.l.IPersistentVector

4:54 or something weaker than that, if you don't need all those guarantees

4:54 like a Collection, or a List, or an Iterable. depends what you "need"

4:56 noncom|3: amalloy: alright, got it. and how do i create such a [] inside the method? doing something like Clojure.read("[1 2 3]") as suggested in the link above does not really seem to be very fast..

4:58 lgrapent`: noncom|3: You can spawn the vector or vec IFn

5:00 noncom|3: lgrapent`: still seems to be slower than PersistentVector.create(...) ...

5:00 but bot that much slower i guess.. if i take care to cache the things...

5:00 what do yo think ?

5:02 see, i am falling back to java because i need speed with operations on ints, which is damn hard with clojure.. therefore i would like to make it all as fast as possible..

5:03 and still the "IFn.invoke" thing returns an Object which requires another cast...

6:16 lvh: Can you turn a bigint into a byte[], or do I need BigInteger for that?

6:16 (I'm trying to turn numeric nonces into byte[24] nonces)

7:04 christian_stamm: Hi. I'm trying to deploy an uberjar to a local nexus using leiningen. lein deploy does not seem to support that. google suggests leiningen-plugins that appear to be unmaintained. Any ideas?

7:05 the software will be used as a selfcontained microservice. Thats why I really want to deploy an uberjar.

7:19 mpenet: lein deploy can take a jar as parameter (and pom.xml etc etc), so you can do it

7:20 christian_stamm: "lein deploy help" will tell you more about this

7:20 christian_stamm: "lein help deploy" actuallaly

7:20 meh, can't type today

7:21 christian_stamm: mpenet i was hoping for sonmething like "lein deploy uberjar", which creates the uberjar just like "lein deploy" creates the jar

7:22 so i do not have to find out the current version in the shell. lein already knows it

7:28 mpenet: I dont think that's possible, maybe something worth doing a PR for!

7:38 hyPiRion: put an issue up first

7:39 ah. see technomancy/leiningen#652

7:39 lazybot: added support for deploy-uberjar plugin -- https://github.com/technomancy/leiningen/pull/652 is closed

7:59 zuzkins: Hey guys, anyone has some experience with putting a js (google closure style annotated) lib on classpath (packaged in a jar), so it will be picked up by the cljsbuild task and could be used in cljs?

8:24 SagiCZ1: hi.. i would like to get interactive development with swing working.. can anyone check why is this not working? i would like to keep re-evaluating the setContentPane function thus changing content of the existing frame.. code -> https://www.refheap.com/89575 .. it actually does switch the content but the Rect is not being drawn

8:24 it works fine when i setContentPane in the "doto" block

8:25 borkdude: is there a function that does a transformation on a map key by function?

8:25 like (assoc m :foo (inc (:foo m))

8:27 update-in probable

8:27 *y

8:28 andyf: borkdude: update-in is what I would recommend: http://grimoire.arrdem.com/1.6.0/clojure.core/update-in/

8:28 borkdude: andyf thanks

8:30 andyf: the cheatsheet might be helpful for looking for functions related to particular data structures, or functionality similar to each other: http://clojure.org/cheatsheet but also these versions with tooltips: http://jafingerhut.github.io/

8:36 SagiCZ1: ok i needed to call revalidate and repaint

8:36 wonder if there is a nicer way with plain swing

8:39 broquaint: SagiCZ1: seesaw?

8:40 SagiCZ1: broquaint: i dont understand how to run the tutorial.. first google result throws me at github source code

8:41 broquaint: SagiCZ1: You eval the code as you go.

8:41 SagiCZ1: so i just check the repo and work with the source?

8:42 broquaint: No, just depend on it and then boot up a repl.

8:43 Is this where you ended up? http://blog.darevay.com/2011/12/a-seesaw-tutorial/

8:45 SagiCZ1: ehre https://gist.github.com/daveray/1441520

8:45 here

8:46 so i added seesaw dependency.. downloaded it.. still dont know what to do

8:47 benzap`: SagiCZ1: you should probably follow a leinegen tutorial

8:47 I had issues understanding the build system at first too

8:47 SagiCZ1: so you do understand what am i supposed to do with the code in the link above?

8:48 benzap`: from the article?

8:48 SagiCZ1: from what i linked

8:48 benzap`: yeah, you need to create a new project with leiningen

8:49 lein new seesaw-tutorial

8:49 go into project.clj, and add the seesaw dependency (this is the hardest part)

8:49 then boot up your lein repl

8:49 or run lein deps first, in the target folder, in my example, it would be ./seesaw-tutorial

8:50 this is all basic leiningen build functionality, so i'd suggest running through the tutorial, and get a good understanding https://github.com/technomancy/leiningen/blob/stable/doc/TUTORIAL.md

8:50 SagiCZ1: i did all that

8:50 and now what<

8:50 ?

8:51 just retype the code from the source and see what it does>?

8:51 benzap`: ah ok, so the next step is to get a repl environment setup

8:52 SagiCZ1: i have the repl up and running

8:52 and it works

8:52 benzap`: where are you running the repl?

8:52 SagiCZ1: Cursive terminal

8:53 am i supposed to read the source code on the link and retype the commands in my repl?

8:53 benzap`: ah I see, so that's a basic repl, you can actually link into a 'repl server' using an editor with an plugin

8:53 most people around here use emacs, but it works with vim, eclipse, etc

8:53 SagiCZ1: like remote repl<

8:53 ?

8:54 benzap`: ya

8:54 SagiCZ1: so whats the host and port?

8:55 benzap`: i'm not sure what the default is... i've just always left it up to my editor to set up the remote repl for me

8:55 cfleming: SagiCZ1: you don't need a remote REPL

8:55 SagiCZ1: i am so confused

8:55 benzap`: when I connect to the clojure repl on my android device, it's usually 9000, but I don't know if that's stanard

8:55 cfleming: You're trying to run the Seesaw tutorial, right?

8:55 SagiCZ1: can anyone explain what "REPL-tutorial" means and how do i use it?

8:55 yes

8:56 cfleming: Ok

8:56 And you have a Leiningen project set up, with Seesaw added as a dependency?

8:56 SagiCZ1: yup

8:56 cfleming: Ok

8:57 So your project has a namespace in it, seesaw-tutorial.core or something similar, right?

8:57 SagiCZ1: no

8:57 just core.clj

8:57 i edited the project.clj file to add the dependency and then i run lein deps

8:57 cfleming: Ok, that one is fine - when you open it, it has the ns declaration and the function that lein creates for you, right?

8:57 SagiCZ1: the dependencies are in my External Libraries

8:58 cfleming: Ok, good.

8:58 SagiCZ1: yeah.. defn foo

8:58 cfleming: Right.

8:58 Delete the defn foo, and replace the text of the file with the text of the REPL tutorial. You probably want to leave the namespace there at the top of the file, but replace the rest.

8:59 SagiCZ1: got it

8:59 and now i can evaluate

8:59 whatever i want

9:00 cfleming: Ok.

9:00 SagiCZ1: send it to repl right?

9:00 works fine

9:00 cfleming: Exactly - the REPL tutorial is really just a series of commands to send to the REPL.

9:00 But don't send the whole file at once, follow it down sending one command at a time.

9:00 The comments explain what it's doing.

9:00 Make sense?

9:00 SagiCZ1: yeah i have a keyshortcut for the "run top form"

9:00 cfleming: Perfect.

9:01 SagiCZ1: thank you very much.. i am sorry to summon you with the "Cursive" magic word with such a stupid question..

9:01 cfleming: Haha, no problem, I've run that tutorial myself - it's nice.

9:01 Seesaw is really great.

9:01 Good luck.

9:01 SagiCZ1: i like swing personally

9:02 so i hope seesaw is just a good clojure way to access swing

9:02 cfleming: Oh, it's lovely.

9:02 SagiCZ1: great!

9:02 cfleming: have a great day.. i gotta run

9:02 cfleming: Check out Dave's presentation from Clojure/West a couple of years back, that explains the basics too.

9:02 Ok, seeya

9:02 SagiCZ1: k

9:12 lxsameer: hey folks, I need a lib to create a proxy server , what do you suggest ?

9:26 ephemeron: Are there interesting examples of using transducers to transform associative collections rather than sequences?

9:37 stompyj: Are clojure “alpha” builds stable outside of the new features?

9:40 hyPiRion: stompyj: I wouldn't count on it. There were some pretty serious "memleaks" in an alpha afaik.

9:40 stompyj: hyPiRion: thanks!

9:40 thats what I was curious about

9:41 hyPiRion: usually it's okay for devel, but I would never use it in prod before there are release candidates

9:45 Bronsa: hyPiRion: the leak was on 1.5.0

9:45 that's why 1.5.1 was released

9:47 stompyj: 1.7.0-alpha1 has only changes for transducers and a patch for faster symbol/keyword creation

9:47 stompyj: so, no more bugs than 1.6.0 aldready had, except for transducers

9:48 stompyj: Bronsa: thanks, I’ll experiment with it. I’ll be honest, I don’t fully understand transducers, but based on the usage patterns I’m seeing, I think I could use them in this project i’m using rightn ow

9:48 heh

9:48 dnolen_: ephemeron: what are you looking for it's pretty straightforward

9:49 Bronsa: stompyj: FYI 1.7.0-alpha1 has a pretty serious equality bugs w/ transducers producing lazy sequences, the fix has already been committed and will be in the next release

9:50 stompyj: Bronsa: Thanks, I’ll move with caution. Although, again, to be honest, I don’t even understand how that would affect me

9:50 heh

9:52 borkdude: Why doesn't this return 1? (go (let [[v c] (alts! [(go 1)] :default 100 :priority true)] (println v)))

9:52 *print 1

9:53 mpenet: is that even possible to nest go blocks?

9:53 borkdude: mpenet I hope so?

9:54 mpenet: but why doing so?

9:54 stompyj: mrb_bk: you there?

9:54 borkdude: I just wanted to have a channel that has 1 in it, and this seemed to do it?

9:55 like this: (go (let [v (<! (go 1))] (println v))) ;; prints 1

9:56 mpenet: well, if you macroexpand (go 1), I believe this get hairy for just a 1

9:56 martinklepsch: hi again. I have a situation where I want to use core.async to make a small ajax request and then initiate a longer running one based on the result of that first smaller ajax request. I'm confused how many channels I should be using/where to store the information from the first request (or should I just put it right into the next channel to make the second request?) does anyone have any guidance for me? :)

9:57 borkdude: martinklepsch you can do that in one go block

9:57 (go (let [body1 (<! (http/get ...) body2 (<! (http/get ... body 1....))))))))

9:57 don't mind the closing parens, they are just an estimation ;)

9:59 supreme__: Hi, Im using a parllax solution that Smashing magazine published some time ago, http://richardshepherd.com/smashing/parallax/ . It uses background-positon to achieve it's effects trough different speeds. How can I make this work with <p> tags? Do I need to make the same stuff but to set the margin-top maybe?

10:00 borkdude: do I have to use :priority true when I use just one channel in alts! with a default value provided?

10:01 my guess is that it doesn't non-deterministically choose the default value

10:09 andyf: CLJ tickets moving to approved! I get excited about such things.

10:12 mdrogalis: andyf: I'll bet!

10:16 mpenet: I hope the work from ztellman on collections makes it in 1.7

10:17 but it's probably for 1.8. But maybe... since other "large" patch are supposed to be part of 1.7 still (lean runtime, feature expr. etc)

10:19 borkdude: mpenet what work on collections is this?

10:20 mpenet: https://groups.google.com/forum/#!topic/clojure-dev/pDhYoELjrcs

10:25 tbaldridge: andyf: https://github.com/clojure/clojure/commits/master :-)

10:26 andyf: yeeha!

10:26 Almost time to go find out which other patches have gone stale.

10:27 hyPiRion: Oh, I know one. http://dev.clojure.org/jira/browse/CLJ-1134

10:28 * hyPiRion is probably the only person who uses cl-format and is affected by this bug.

10:29 andyf: by stale there, I simply meant any patches that no longer apply cleanly to the latest Clojure master after the most recent commits

10:29 not any reference to their age :)

10:31 adereth: (setq display-time-string-forms

10:31 '((propertize (concat " " 12-hours ":" minutes " "))))

10:31 doh

10:33 justin_smith: elisp? in my clojure channel?

10:34 adereth: My worst fear about using emacs as my irc client just came true.

10:34 justin_smith: heh, I have done much worse

10:35 for example, accidentally cutting and pasting a significant chunk of the irc buffer back in at the prompt - the strings remain propertized, so nothing looks wrong at first glance...

10:36 mrb_bk: stompyj: hello

10:38 Bronsa: justin_smith: ahah I've done that

10:48 ephemeron: dnolen_: Mostly curiosity. I was wondering if the new abstractions allowed for a better way to e.g. map/filter over hashmap values.

10:52 dnolen_: ephemeron: they do, you can do it w/o lazy seqs

11:02 csd_: Can someone critique this code to help me improve my technique? http://pastebin.com/8daApynG

11:03 justin_smith: csd_ the vec call on line 4 does nothing

11:04 llasram: csd_: You should keep your wrist firm, swing with the whole arm, avoid locking your elbow at the end, and keep your eye on the lambda the entire time

11:04 csd_: ha

11:05 llasram: csd_: I haven't fully read the code, but you very rarely actually need `loop`/`recur`. You can usually get away with one of the higher-order function capturing one of the standard recursion patterns

11:05 justin_smith: instead of calling map twice in a row, it's better to use comp (map (comp #(Integer/parseInt %) str) ...)

11:05 also #(str %) is just str

11:05 llasram: csd_: What's this function ultimately intended to do?

11:06 csd_: It's solves http://www.4clojure.com/problem/86

11:08 justin_smith: csd_: looking at my own solution to that problem - yours should be very close to being correct if it isn't already

11:09 once you've solved it I can show you my version if you like

11:09 we are doing basically the same thing, just expressing it differently

11:11 csd_: Mine solves it.. just want to make sure i'm doing things as well as i can

11:11 justin_smith: here's mine https://www.refheap.com/89577

11:12 the same algorithm (except I use repeated rem / quot instead of parsing each char of the string)

11:13 csd_: when would you want to use `while` instead of loop/recur or a HoF

11:13 justin_smith: I wrote it a while ago - that call to get should be contains? instead

11:14 while makes sense when you are checking state

11:14 llasram: csd_: https://www.refheap.com/89578

11:15 justin_smith: llasram: very nice

11:18 llasram: csd_: `while` is pretty much only good for side-effects. The only place I can think of off the top of my head where I've used it is in a polling loop

11:18 justin_smith: yeah - if your condition is a message coming from a channel or maybe a status reply from another process...

11:18 or maybe even an atom getting set by another thread

11:20 llasram: Maybe... Watches are good for that. And in-process you can usually use some sort of push messaging from the producer

11:22 justin_smith: llasram: but if the task to interrupt when you get the message is a loop with one clear stopping point, while can wrap that nicely. Then again, I've never even used watches in anger.

11:39 fifosine: How do I require all functions in a namespace in the repl?

11:40 I tried (require 'name.space :all) but the syntax is obviously wrong

11:41 nvm, figured it out

11:44 virmundi: which is more idiomatic clojure (somefn {:config1 :setting1 :config2 :setting2 :other :settings}) or (somefn :config1 :setting1 :config2 :setting2)? Specifically I’ve got a map that has general connection information in it. Then I’ve specific setting based upon when the user is trying to do. I just learned the & args {:keys [name1 named2]} trick.

11:45 justin_smith: virmundi: use a map as an argument

11:45 it composes better

11:45 virmundi: ok

11:45 thanks

11:45 puredanger: re http://dev.clojure.org/jira/browse/CLJ-1516 does anyone know of Clojure code that uses vars with "." in the *name* ?

11:46 Bronsa: puredanger: I just replied

11:46 justin_smith: puredanger: none that I have ever read

11:47 Bronsa: puredanger: ah wait, that might break clojure.core/.. now that I think about it

11:47 puredanger: heh

11:48 Bronsa: puredanger: ... and core.incubator/.?.

11:49 puredanger: those are both *leading* dots - maybe a special case?

11:49 TimMc: ,(def a.b 4)

11:49 clojurebot: #'sandbox/a.b

11:49 TimMc: ,sandbox/a.b

11:49 clojurebot: 4

11:49 TimMc: Plausible.

11:49 Bronsa: puredanger: no, they work because they are macros

11:50 ,(defmacro a.b [])

11:50 clojurebot: #'sandbox/a.b

11:50 Bronsa: ,(a.b)

11:50 clojurebot: nil

11:50 puredanger: Bronsa: right, makes sense

11:50 Bronsa: puredanger: should I update the patch to check whether the var is marked ^:macro then?

11:51 puredanger: leading is also different in that it can't be confused with a class name

11:51 justin_smith: ,(->> (all-ns) (mapcat ns-publics) keys (map name) (filter #(re-matches #".*\..*" %)))

11:51 clojurebot: (".." "a.b")

11:51 Bronsa: eh well, leading is special cased in the macroexpander though puredanger

11:51 (.foo x) -> (. x foo)

11:52 so a .foo Var might work as a value, but not in a call position

11:54 stompyj: Is the cursive clojure author in here right now?

11:54 (sorry, I can’t recall their name)

11:54 puredanger: Bronsa: unless it's a macro (like .?.)

11:54 justin_smith: stompyj: cfleming

11:54 stompyj: justin_smith: thanks

12:04 Bronsa: puredanger: I updated the patch, now it only throws on non macro defs

12:04 puredanger: ok, thx

12:04 Bronsa: had to tweak the definition of defmacro to include {:macro true}

12:04 puredanger: ha

12:05 Bronsa: (defn .. [&env &form & rest] ...) (.setMacro #'..) didn't really help

12:06 puredanger: btw what's the reason for vswap! to be a macro?

12:08 puredanger: that was Rich's request and I didn't ask him why. but I suspect it's because you're doing something that isn't thread safe so he didn't want that on the Volatile itself as a method

12:10 the deref / reset in vswap! is racy - that's fine if you constrain how and when it's called and understand the implications

12:10 if I get a chance, I'll ask Rich about it

12:13 I suspect 1.7.0-alpha2 approacheth btw if anyone is interested...

12:13 justin_smith: ,*clojure-version*

12:13 clojurebot: {:interim true, :major 1, :minor 7, :incremental 0, :qualifier "master"}

12:14 Bronsa: puredanger: TBH i'm still not convinced it needs to be a macro, there might be a good reason but I don't see it. thanks anyway :P

12:14 puredanger: Bronsa: I don't think it *needs* to be a macro either, could easily be implemented as a method on Volatile

12:16 Bronsa: puredanger: now you've lost me, why can't it just be (defn vswap! [v f & args] (vreset! v (apply f @v args)))?

12:17 puredanger: it could also be that, but it would incur multiple var invocations at runtime

12:17 Bronsa: puredanger: right, but core has unrolls & :inlines all over the codebase

12:18 puredanger: I don't think we're trying to increase the usage of :inline at all

12:19 Bronsa: we don't have anything better yet though, forcing a valid fn to be a macro just for the sake of not using :inline seems moot

12:20 I'm not trying to give you a hard time, just playing devil's advocate

12:29 oooooh https://github.com/clojure/clojure/commit/7977b49567ecb8023abfd51e90dcbd2581c41358 finally

12:30 lvh: I wonder why that isn't spelled (update-in m [k] ...)

12:30 performance?

12:30 clojurebot: performance is http://meshy.org/2009/12/13/widefinder-2-with-clojure.html

12:32 mi6x3m: can someone explain to me why this happens

12:32 (def f #())

12:32 TimMc: ,(macroexpand-1 `#())

12:33 clojurebot: (fn* [] ())

12:33 mi6x3m: (= (with-meta f {:a 1}) (with-meta f {:a 2})) returns false

12:33 TimMc: A swing and a miss!

12:34 mi6x3m: While metadata does not change equality semantics, functions don't really support = in the first place.

12:34 Adding metadata requires creating a new object, so the two are no longer identical? to each other.

12:34 Bronsa: mi6x3m: hiredman might have something to tell you about that :)

12:36 (if he's around)

12:37 mi6x3m: TimMc: well yes but in this case f is the same object

12:38 Bronsa: mi6x3m: after the with-meta, it isn't

12:38 TimMc: mi6x3m: Metadata isn't magical, it's an instance field.

12:39 &(let [a [1 2 3]] (identical? a (with-meta a {:b 1})))

12:39 lazybot: ⇒ false

12:40 TimMc: (= f f) is only true in a vacuous sort of way

12:50 fifosine: Does anyone have experience creating simple sampled sounds? Like a simple sine wave sound?

12:50 justin_smith: fifosine: yup

12:51 fifosine: justin_smith: Do you have a gist, by any chance? Or do you use a library?

12:52 justin_smith: fifosine: here is a lib that does that and a lot more https://github.com/kunstmusik/pink

12:52 it does software based audio synthesis in pure clojure

12:53 here's where he creates the source for the sine wave https://github.com/kunstmusik/pink/blob/master/src/pink/gen.clj#L12

12:53 fifosine: justin_smith: do you prefer it over dynne?

12:53 justin_smith: I was not familiar with dynne

12:53 pink is from one of the lead devs of csound

12:54 he also wrote blue, a pure java ide / daw hybrid for doing algorithmic composition

12:55 stompyj: csound! awesome, haven’t used that in a good 10-15 years

12:55 fifosine: justin_smith: Just a quick, off-topic question, in that source-file you linked, he defines a macro get-sine-value. Why was it better in this case to define it as a macro and not a function? (I still don't know how to use macros)

12:55 justin_smith: stompyj: it's much more real time friendly now - you can define instruments in real time

12:56 fifosine: I am not sure - probably because he doesn't want to pay for var lookup at runtime? basically intent to inline is my guess

12:56 stompyj: awesome, I loved it even back then.

12:56 I should check it out

12:56 justin_smith: stompyj: it also compiles to pnacl now - which means it can run inside a chrome browser

12:57 stompyj: http://vlazzarini.github.io/ check out "Stria" - its a classic composition, rendering in real time in the browser

12:58 stompyj: the interactive demos are cool too

12:58 mi6x3m: TimMc: I'd follow that argumentation _if_ there wasn't a strict contract for the semantics of with-meta and meta in general :)

12:58 i understand functions are somewhat of an exception

12:58 stompyj: justin_smith: whoa, this is crazy

12:58 mi6x3m: but the same object is the same object

12:58 stompyj: between this and max/msp live integration, this is the rig I wish I had back then

12:58 LOL

12:59 justin_smith: stompyj: yeah, pnacl means clean enough c code can be compiled to run in the browser portably - and csound just happens to be clean enough for that

12:59 stompyj: also, there is a program called cabbage, that runs as a vst and lets you graphically define csound instruments

12:59 TimMc: mi6x3m: What do you mean by "the same object is the same object"?

12:59 fifosine: justin_smith: do you know of a tutorial for using pink? the docs seem sparse

12:59 mi6x3m: well it's effectively the same function

12:59 in every possible aspect

12:59 except the meta

12:59 justin_smith: fifosine: there is an examples folder

12:59 fifosine: but also it's a fairly young project

13:00 fifosine: oh wow, just a few weeks

13:00 justin_smith: it's derived from some stuff he was doing with clojure in blue

13:01 http://blue.kunstmusik.com/ blue supports embedding clojure code into compositions (or python, or js, or java)

13:04 gfredericks: hooray clojure.core/update is commited

13:08 TimMc: Now to get (update-in _ [] _) fixed... :-)

13:09 mi6x3m: "effectively the same function" doesn't really mean anything -- functions are considered uncomparable...

13:18 mi6x3m: TimMc: well this is interesting given you have enough info to determine they are completely identifcal :)

13:18 -f

13:18 TimMc: That's a JVM thing and doesn't really count.

13:18 (= f f) only accidentally returns true

13:19 mi6x3m: accidentally, I see

13:26 gfredericks: ,(= (partial + 1) (partial + 1))

13:26 clojurebot: false

13:58 amalloy: oh man, https://github.com/clojure/clojure/commit/7d77fa43902dfaa820e4f24a7d54e7ca9fff2733#diff-b6b5d2fff4501df40d740b659c3b5dccR179 is the worst sort of test. it's not *that* hard to convert a deadlocking test into a failing test

14:02 dbasch: amalloy: the language is supposed to be lazy, not the developers :P

14:02 arrdem: :D

14:02 AimHere: Perl programmers are supposed to be lazy

14:03 laziness, impatience and hubris

14:03 dbasch: AimHere: the three horsemen of the perlpocalypse?

14:04 AimHere: Or the three programmer virtues, depending on how you view Perl

14:08 TimMc: amalloy: How would you do it? Wait n milliseconds and kill it?

14:12 amalloy: TimMc: create a promise, a future to deliver to it, and then a deref with timeout

14:13 is how i've done that in the past. i think one of the patches i tried to get into clojure used that approach

14:13 justin_smith: amalloy: why not just deref the future with a timeout?

14:14 amalloy: that does sound simpler, justin_smith. i don't see any reason why not

14:14 i just forgot you can do that

14:14 bja: is there any package that lets me declare config variables in a central with defaults and validation, perhaps using environ and schema? I realize I can write this myself, just casting a line first

14:23 justin_smith: bja: environ and schema would be good bets, they are both widely used, and I can't see why you couldn't use schema to validate the config that environ accesses

14:39 andyf: amalloy: Guilty as charged

14:39 amalloy: I would suggest this is an even worse test: https://github.com/clojure/clojure/commit/5123c956477b48bb995d2c2b4621ef2291315498

14:40 Disabled because it fails only on IBM JDK 1.6 but no others

14:40 amalloy: i wonder why it doesn't work on that jdk

14:41 andyf: Because IBM's implementation of UTF-16 is different than Oracle's

14:43 amalloy: is it actually possible for two implementations of UTF-16 to be different but both correct? i wouldn't think so

14:43 andyf: When the buffer you give it has 1char left but next Unicode code point needs 2 chars, it behaves differently

14:46 It is possible to work around the difference in JVM behaviors, but Clojure core didn't want to go that way

14:48 upwardindex: Anyone has had this type of problem with http-kit? https://github.com/http-kit/http-kit/issues/163

14:49 andyf: I guess I haven't tried IBM JDK 1.7 with that - the test probably fails there, too.

15:05 ephemeron: dnolen_: (Sorry for the late reply.) When I asked about transducers and mapping/filtering over values of a hashmap, you mentioned that they could be used to avoid intermediate seqs, but would that be an advantage over reduce-kv?

15:06 miber: if I define foo like this http://pastebin.com/sKQrb7M7 why can't I call it without args like (foo)? is there a way to have foo accept zero and more args?

15:09 adereth: miber: I think you want (defn foo [& {:keys [a b] :or {a 1 b 2}}] [a b])

15:09 Then you can call (foo :a 3) instead of (foo {:a 3}), and (foo) instead of (foo {})

15:10 miber: aye, that's it

15:10 thank you

15:11 jlongster: I'm publishing a post on CSP in JavaScript next week, and I was wondering if I could get some feedback on a demo. Go here and run the code: http://jlongster.com/Test-CSP?preview=true for those who use core.async, is the visualization intuitive/make sense?

15:14 justin_smith: miber: adereth: best of both worlds: (defn foo [& [{:keys [a b] :or {a 1 b 2}}]] [a b])

15:14 map args end up working out much better than & :keys

15:15 dnolen_: ephemeron: don't follow reduce-kv can take a transducer

15:16 hiredman: dnolen_: I don't know that it can

15:16 puredanger: yeah, I think actually it doesn't right now

15:16 that was a consequence of one of the design decisions internally vs what was done in reducers

15:16 hiredman: transducers being transforms of reducing functions, the reducing function for reduce-kv is of a different type

15:17 dnolen_: hiredman: oh right the signature is different

15:17 hiredman: reduce-kv is actually kind of annoying

15:17 miber: justin_smith: isn't adereth's version more idiomatic in terms of having a function that takes optional arguments?

15:17 dnolen_: ephemeron: anyways, reduce-kv is orthogonal to transducers

15:17 justin_smith: miber: options maps are preferred in practice

15:17 dnolen_: ephemeron: reduce-kv to accomplish what transducers do would need to take a transducer like thing

15:18 justin_smith: miber: maybe that's a more dev culture thing than language design, but it's easier to compose things, and you have more flexibility, when the optional args are all in a map

15:19 miber: ok

15:24 kqr: how would one construct a regex in clojure with the COMMENTS flag set in the underlying Pattern object?

15:24 bbloom: kqr: you can just call the constructor normally

15:24 kqr: you don't need to use the literal syntax

15:25 kqr: but you can also use the (?x) flag

15:25 kqr: yeah, I was just curious if there was a way to set it with the literal syntax

15:25 bbloom: http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#COMMENTS

15:25 kqr: how would one use the ?x flag? I'm not well versed in the Java world

15:26 justin_smith: kqr: C-f for "flag" here http://clojuredocs.org/clojure_core/clojure.core/re-pattern

15:26 bbloom: ,(.flags #"(?x)")

15:26 clojurebot: 4

15:26 justin_smith: line 38 of the example

15:27 kqr: justin_smith, ah brilliant

15:27 bbloom: ,(bit-and (.flags #"(?x)") java.util.regex.Pattern/COMMENT)

15:27 clojurebot: #<CompilerException java.lang.RuntimeException: Unable to find static field: COMMENT in class java.util.regex.Pattern, compiling:(NO_SOURCE_PATH:0:0)>

15:27 bbloom: ,(bit-and (.flags #"(?x)") java.util.regex.Pattern/COMMENTS)

15:27 clojurebot: 4

15:27 kqr: justin_smith, very nice. thank you!

15:28 justin_smith: actually starts on 27 I guess, but I think that's exactly what you were looking for

15:28 kqr: yup

15:28 that regex mode is a godsend for writing more complicated regexes

15:29 justin_smith: it really seems like it would be

15:29 kqr: you can have indentation and just a few characters per line

15:29 really showing the structure of things

15:29 it probably makes it dangerously easy to read/write regexes...

15:29 justin_smith: I have seen scheme versions of an alternate regex syntax (sexp rather than string based) so that regexes become properly composible, transformible, etc.

15:29 kqr: yeah

15:29 justin_smith: this was for scsh iirc

15:30 kqr: i've been experimenting with writing a DSL for constructing regexes

15:30 justin_smith: I think the way scsh did it would be -- if not ideal, at least an excellent start

15:30 kqr: some combinators are really useful, such as "this regex represents a thing, now find a bunch of things separated by this regex"

15:30 for example

15:31 but in the end, I think a combination of raw regexes and combinators are the way forward

15:31 justin_smith: http://scsh.net/docu/post/sre.html some examples and a spec here

15:32 kqr: yeah the verbosity of that is what makes me think a combination is best

15:32 justin_smith: it uses operator overloading - which is not ideal for clojure

15:33 kqr: conciseness - the cause of, and the solution to, all regex problems

15:33 kqr: hahaha

15:33 you're not entirely wrong

15:33 but there's still a little part of me that thinks sometimes smaller things are easier to read because we can absorb more of it at once

15:33 justin_smith: can I quote you on that, in my resume?

15:33 kqr: or something

15:34 justin_smith: kqr: I information theory can lead us to a mathematical proof of the ideal conciseness / verbosity balance

15:34 kqr: I look forward to any results on that

15:35 justin_smith: the more inherently concise a syntax, the more likely an error is valid syntax, but not what you wanted

15:36 as a programmer, the potential a typo that still runs, but doesn't do what I wanted, is a very frightening thing

15:39 turbofail: something something shannon limit

15:39 justin_smith: exactly

15:43 turbofail: you can get the full Shannon article from bell labs http://cm.bell-labs.com/cm/ms/what/shannonday/shannon1948.pdf

15:43 it's brilliant

15:47 avi__: justin_smith: the cross-entropy of source code is far far far less than than english

15:47 amalloy: justin_smith: "the potential a typo that still runs, but doesn't do what I wanted" makes me think of keywords

15:47 avi__: justin_smith: software is very simple, repetitve and rigid (at least how people write it)

15:48 justin_smith: amalloy: yeah, I think of them that way too

15:48 turbofail: avi__: clearly you haven't read enough perl

15:49 avi__: turbofail: real perlers write perl in a simple clear and repetitive manner

15:49 justin_smith: avi__: this is a bonus, it makes it easier to see accidental or corrupt content

15:49 avi__: justin_smith: http://macbeth.cs.ucdavis.edu/natural.pdf

15:49 justin_smith: avi__: that article looks really cool, thanks

15:50 avi__: justin_smith: by studying large corporae of software we found that software wasnt super exciting and people write boring stuff

15:50 justin_smith: avi__: are you quoting the article, or is this something you actually worked on?

15:50 avi__: I am the first the author

15:50 justin_smith: oh, awesome, thanks for sharing

15:50 avi__: On that topic, I'm a software engineering researcher studying the topics of issue/bug reports. Like those issues on the docker repo ;) I'm looking to pick the brains of devs to help validate if these NLP topics make any sense. I've got a short 10 minute survey consisting of "one of these things are not like other" questions. If you're interested in the survey please PM /msg avi__ me.

15:50 justin_smith: (inc avi__)

15:50 lazybot: ⇒ 1

15:51 avi__: (probably going to decr me for that one)

15:51 justin_smith: heh

15:51 avi__: justin_smith: so using the n-gram model of code we can find the locations of syntax errors too

15:52 justin_smith: my PhD student did a demo for java and a working one for python

15:52 justin_smith: avi__: I would love a probabalistic linter for clojure - something that would scan your code and tells you which parts are "weird"

15:53 mdeboard: lol

15:53 avi__: justin_smith: yeah totally doable if you can lex it (of course you can) https://github.com/orezpraw/unnaturalcode http://webdocs.cs.ualberta.ca/~joshua2/syntax.pdf

15:56 justin_smith: yeah the information content of code is really neat

15:56 justin_smith: it is related to readability as well

15:57 justin_smith: if you look at english complexity metrics, they are basically entropy or entropy * size.

15:57 justin_smith: halstead's V is a vocabulary based -- entropy like -- metric for code that is similar

15:57 justin_smith: and it correlates with human rankings of code readability

15:58 justin_smith: the takeaway: code with a lot of uniq tokens is complicated to read. Code with lots of repetition and fewer unique tokens is easier to read. And of course the less code to read the more readable.

15:58 tac: Why does Hickey seem to have case/match statements?

15:58 I've seen two talks now where he mentions it

16:00 turbofail: hate or have?

16:01 justin_smith: tac: is he, by any chance, contrasting them to a mechanism like multimethod dispatch?

16:01 tac: hate*

16:01 sry

16:01 justin_smith: I'm not sure. It's always been in passing

16:01 But it's stuck out both times, because case-splitting is the morally correct way to do if statements :X

16:02 turbofail: i feel like racket is the lisp that does pattern matching best at the moment

16:02 tac: but I'm guessing he is judging them in a type-less context

16:02 avi__: tac: is that because you believe most if statements don't need precedence?

16:02 tac: or that if-chains usually are precedence free?

16:03 tac: It's not really about precedence

16:03 It breaks up a value, then dispatches based on what form it has

16:10 also, he's mentioned queues a lot.

16:11 Which is strange, since I don't think I've ever used a queue

16:11 But that probably says more about the kind of software I typically write

16:12 bbloom: tac: or you're just doing everything wrong. queues are awesome

16:12 justin_smith: tac: just speculating, but if you ever start doing serious concurrency, you will probably learn to admire queues

16:13 tbaldridge: tac, there's two problems with pattern matching, IMO.

16:13 tac: bbloom: justin_smith: If either of you wants to convince me, my mind is open today :)

16:13 What makes queues magical :)

16:14 tbaldridge: tac: firstly pattern matching is often tied to types. That is to say, if I pattern match off of a vector of strings, does it always have to be a vector?

16:14 bbloom: tac: well, what type of software do you typically write? i ask so that a good answer can be tailored to you

16:15 virmundi: justin_smith: why is there no (not-nil?)

16:15 bbloom: virmundi: b/c there is seq

16:15 tbaldridge: tac: secondly, most pattern matching is closed, if I want to extend a pattern match, I have to go off and modify the original code. Something like multimethods are much more open

16:16 bbloom: tbaldridge: i'm not sure i understand your first point

16:16 tac: bbloom: single-threaded web stuff ;(

16:16 bbloom: tac: do you log anything? that's a queue :-P

16:16 justin_smith: also, if you want to check non-sequential things, there is (complement nil?) ##(map (complement nil?) [nil true [0 1 2] :ok])

16:16 lazybot: ⇒ (false true true true)

16:16 mdrogalis: tbaldridge: Wasn't order-complecting one of his complaints?

16:17 bbloom: tac: you've never needed to run a background task?

16:17 mdrogalis: yeah, rich's primary complaint is that typical pattern matching implies ordered choice

16:17 tac: hmm

16:17 tbaldridge: right as well as types: http://www.reddit.com/r/programming/comments/lirke/simple_made_easy_by_rich_hickey_video/c2t7a9f

16:18 justin_smith: bbloom: wouldn't the request -> handler dispatch be based on a queue?

16:18 tbaldridge: at least that was the argument from simple made easy

16:18 tac: gotcha

16:18 with the background tasks, logging

16:18 bbloom: justin_smith: not at the application level

16:18 justin_smith: ahh, right

16:18 tac: it's whenever you need to delegate work, then, right?

16:18 amalloy: ,(doc some?)

16:18 clojurebot: "([x]); Returns true if x is not nil, false otherwise."

16:18 tac: and it's not so important who handles it

16:18 amalloy: ;; virmundi, justin_smith

16:19 added in 1.6

16:19 bbloom: tbaldridge: i agree that ordered choice pattern matching is problematic

16:19 tbaldridge: for similar reasons i dislike peg grammars

16:19 tac: also, re: pattern matching... yeah. It sucks when order matters in your branches.

16:19 justin_smith: amalloy: oh, cool, added 1.6 so I wasn't familiar

16:19 Clarice: What's the point of some? if there's or?

16:19 justin_smith: and now I see you already said that :)

16:20 tac: done "properly", pattern matching should be order-independent always.

16:20 justin_smith: Clarice: Some takes only one arg

16:20 tac: It's just very convenient sometimes to break that rule

16:20 justin_smith: Clarice: I don't see how or would replace it at all

16:20 amalloy: justin_smith: 1.6 added a number of functions that distinguish between nil and false

16:20 bbloom: tbaldridge: also reading rich's comment about types, i think he's complaining about both product types and sum types, not about issues like vectors vs other sequentials

16:20 justin_smith: amalloy: cool, thanks, I wasn't aware

16:21 bbloom: tbaldridge: in particular with respect to pattern matching on sum types, they enforce exhaustiveness tests at all usage sites

16:26 side note: i've never found a satisfactory academic treatment of tagged products, which is the only type that appears in real languages

16:27 the closest i've seen is the notion that Foo(x,y) is actually dependently a typed (Foo,x,y)

16:27 noprompt: bbloom, dnolen_: is it possible to know what the namespace part of a symbol fully resolves to in cljs from a macro? for example if i (:require [om.core :as om]) and want to rewrite om/IRender as om.core/IRender.

16:27 bbloom: nevermind i've also never found a satisfactory academic treatment of the associativity of the binary product type constructor

16:27 justin_smith: noprompt: isn't that what ` does?

16:27 bbloom: justin_smith: that only works for the clj env

16:27 noprompt: justin_smith: not necessarily

16:28 justin_smith: ahh, OK

16:28 bbloom: justin_smith: sometimes you get lucky and the two overlap, like as with most of core

16:28 noprompt: you'd have to use the @namespaces atom

16:28 noprompt: bbloom: on a scale of 0 to 1 how dicey is that. :P

16:28 bbloom: noprompt: i haven't done it yet, but i wanted to create a cljs-aware sytnax quote using my backtick library

16:30 noprompt: bbloom: that'd probably be helpful to me. i'm working on a clojurescript tracing library and having the symbol be fully resolved is helpful.

16:30 bbloom: noprompt: it should be quite easy to do, give it a go

16:31 Bronsa: noprompt: try using (cljs.analyzer/resolve-var &env 'om/IRender)

16:31 (from inside a "cljs" macro)

16:31 noprompt: Bronsa, bbloom: will give it shot.

16:31 bbloom: noprompt: https://github.com/brandonbloom/backtick/blob/4672faf9219a4a714afa27fda25da205d29dc60a/src/backtick.clj#L85-L101

16:32 noprompt: that handles all the edge cases for the jvm

16:32 Bronsa: bbloom: if only symbol resolution was that easy for cljs too

16:32 bbloom: Bronsa: all the dotted paths nonsense?

16:32 :-/

16:33 Bronsa: bbloom: js/, gclosure "namespaces" & "vars", Var.foo etc

16:33 bbloom: Bronsa: argh. indeed

16:39 Bronsa: bbloom: btw remember when I was thinking about macroexpanding js/foo into js* forms?

16:40 I actually did it for tools.analyzer.js, but then ended up reverting it and introduced a :js-var op instead

16:40 bbloom: yeah, extra ops is often a good call

16:40 especially when it comes to host complexity

16:40 Bronsa: Having all interop forms macroexpand to a single special form is neat, but you lose a lot of context & info

16:40 elarson: in a lein project, I added a dependency for ring/ring-core "1.3.1" and running lein deps seemed to install it (it showed up in my ~/.m2/repository directory). but when I try to require it in the ns macro for my core.clj, I get FileNotFoundExceptions saying there isn't a .class or .clj file on the classpath with that name.

16:41 justin_smith: elarson: what are you trying to require? note that project names are not the same as namespace names

16:42 elarson: justin_smith: I've tried so many options, but specifically I wanted to use the functions in ring.util.time

16:43 justin_smith: elarson: can you paste your require form to refheap or a gist?

16:43 *your ns form (or require if you are doing it from a repl...)

16:45 elarson: justin_smith: https://gist.github.com/ionrock/ed1b8de49df61f228748

16:45 hiredman: I have a protocol with a single function (f), and in a few places I call that function, in the places I call it (f x) I get compile time errors, but if I change it to (apply f [x]) no compile time errors and no errors at runtime

16:45 (protocols suck)

16:45 justin_smith: elarson: also, based on the project.clj for ring-clojure, I think you want [ring "1.3.1"]

16:46 elarson: justin_smith: I have [ring/ring-core "1.3.1"] in dependencies.

16:46 Bronsa: hiredman: what's the compile time error?

16:46 amalloy: that's exciting, hiredman. any idea why?

16:46 Bronsa: I believe (f x) will go through the interface while (apply f [x]) won't

16:47 hiredman: Bronsa, amalloy: no lemme dig up the stacktrace

16:47 it is the "no implementation of this protocol for this function" or whatever very confusing error protocols to that effect

16:47 amalloy: Bronsa: (f x) looks at the var at compile time. i'd be surprised if (apply f [x]) never used the interface

16:48 hiredman: the project is doing aot, I should see what happens if I remove that

16:48 Oh, huh, actually, it maybe because I called the protocol function "wait"

16:48 I wonder if that has some adverse interaction with the wait on Object

16:48 Bronsa: yeah that's likely the cause then hiredman

16:49 justin_smith: elarson: https://www.refheap.com/89587 I can use it from a brand new project

16:49 bbloom: hiredman: protocols define backing interfaces which have a shared global namespace :-(

16:49 justin_smith: elarson: by asking for [ring "1.3.1"]

16:49 Bronsa: amalloy: you might be right, I don't remember off the top of my head; looking in the source now

16:49 amalloy: hiredman: that sounds like it to me

16:49 bbloom: go gets this wrong too

16:50 amalloy: a protocol pitfall i'd not thought of

16:50 bbloom: same issue as java where there's a single namespace for methods

16:50 elarson: justin_smith: well, even though it is not working for me, I'm glad it works for someone ;)

16:50 justin_smith: elarson: that's using alembic.still inside a vanilla "lein new" project

16:50 elarson: that gives me a bit hope

16:50 justin_smith: try changing the project part of the dependency to just ring

16:50 hiredman: interesting, I guess that was the first time I had a non-higher order usage of that protocol

16:51 elarson: justin_smith: trying that now

16:51 Bronsa: amalloy: I'm looking at the macroexpansion of a defprotocol now, I don't see any reference to the interface method

16:51 hiredman: anyway, that was it

16:52 bbloom: Bronsa: doesn't the compiler discover protocol call sites?

16:52 elarson: justin_smith: changing the dependency seemed to be it!

16:52 thank you

16:52 Bronsa: bbloom: yes, we were talking about HOF usage of protocol functions

16:52 bbloom: oh ok

16:52 justin_smith: elarson: awesome - in the future, use the dep in the form you see it in the project.clj of the lib you are using

16:53 elarson: np

16:53 Bronsa: bbloom: f could be implemented as (defn f [this ..] (if (instance? this Interface) (.method this ..) ..)) but it doesn't look like it is

16:53 elarson: justin_smith: will do. that is helpful as well b/c I've seen some projects that don't include a lein dependency string to use.

16:53 Bronsa: it just uses the method cache

16:54 bbloom: Bronsa: https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_deftype.clj#L508-L509

16:54 Bronsa: blargh, (instance? Interface this)

16:55 bbloom: uh, hmm

16:56 justin_smith: elarson: tangentially, pallet/alembic is an awesome dep to have in your global profiles.clj, because it makes it very easy to temporarily try some dependency without having to restart your repl

16:57 Bronsa: ah nevermind, I see it now: https://github.com/clojure/clojure/blob/master/src/clj/clojure/core_deftype.clj#L571

16:59 amalloy: hey, Bronsa, that's the one line in that file that i committed

16:59 Bronsa: yeah I remember now

16:59 bbloom: https://github.com/clojure/clojure/blame/1d856d485baeedd75c508495c5a966bf4d9a4375/src/clj/clojure/core_deftype.clj#L571 well i'll be dammed :-P

17:00 amalloy: bbloom: indeed, i did check git-blame before making my claim

17:00 Bronsa: defprotocol's impl is definitely not the easiest code to read

17:01 bbloom: Bronsa: not at all

17:01 Bronsa: it's kinda crazy actually

17:01 Fare: frankly, I'd like to dislike clojure, but I can't.

17:02 justin_smith: "I just don't know how to System/exit you"

17:08 maacl: Hi guys, I have a Java interop question. I am trying to access the accept method of a com.sun.jersey.api.client.WebResource but I get No matching method found: accept for class which is clearly not correct as the method does exist. Can anyone help out?

17:11 puredanger: are you using Clojure 1.6+ ?

17:11 that error message was improved to show the types (if known) in 1.6. if you are seeing unknown, then it has no type info

17:12 you probably need to type hint either the resource or an arg if there is one

17:12 maacl: using 1.5.1 at the moement

17:13 puredanger: not sure I can tell you more without a gist, but most likely you just need a type hint

17:15 aperiodic: oh, those are var arg methods

17:16 maacl: puredanger: sorry, thought that was directed at me

17:16 aperiodic: which I think means you need (into-array String <collection of strings>) as the argument in the interop form

17:16 amalloy: maacl: it was

17:18 puredanger: maacl: it was directed at you :)

17:18 arohner: using core.async, if a bunch of consumers are waiting for the same event to finish, is it idiomatic to just close a channel to signify 'it's done'?

17:18 maacl: amalloy: oh, now I am completely confused

17:18 arohner: I don't really feel like muxing a chan for each consumer

17:19 puredanger: arohner: closing a channel does a good job of indicating "done"

17:19 aperiodic: maacl: you need a java array of the appropiate type to pass to the method

17:20 gzmask: how do I use math.floor in clojure?

17:20 amalloy: aw, i'm sad this doesn't work: $ ln -s /usr/bin/git ~/bin/git-git; git git commit

17:21 maacl: I am basically trying to implement this: https://gist.github.com/maacl/2cd4e05c53221d0c730a in Clojure

17:21 amalloy: i frequently forget and type too many gits

17:21 gzmask: i tried (Math.floor 0.01) gives error

17:21 arrdem: &(Math/floor 0.01)

17:21 lazybot: ⇒ 0.0

17:21 arrdem: gzmask: ^

17:22 aperiodic: maacl: (.accept resource (into-array MediaType [MediaType/TEXT_XML])


17:22 amalloy: Fare: https://twitter.com/technomancy/status/327234371813781505

17:22 gzmask: ahh, I thought / and . are interchangeable. thanks !

17:23 Fare: when I watch TV and that's what I think

17:23 arrdem: gzmask: not in this context. . would be used to note an instance method, / is for static methods

17:23 maacl: aperiodic: Ah, and this is because accepts accepts multiple media types?

17:24 gzmask: i see. thx :)

17:24 justin_smith: maacl: clojure does not do the same varargs sugaring java does

17:24 * arrdem checks to make sure that's actually right

17:24 justin_smith: maacl: varargs are really just an array as the last arg

17:24 aperiodic: maacl: yes, it's a var args method which in actuality means it takes an array of the method type

17:24 s/method/arg/

17:27 maacl: aperiodic: got it,really bad at Java.. is it corectly understood that "MediaType... types" this is what indicates that it is a var args method?

17:27 bobpoekert: Is there a way to tell vimclojure to call pprint on a selection? copy/pasting into a repl is kind of annoying.

17:28 aperiodic: maacl: yup, the elipses after the argument type indicates var args

17:28 s/el/ell/

17:29 maacl: aperiodic: great, thanks

17:29 aperiodic: well I guess it's one ellipsis

17:29 maacl: you're welcome

17:30 arrdem: bobpoekert: I think that vimclojure has been depricated for vimclojurestatic and fireplace.vim

17:31 but I'm no longer a Vim clojurist so not sure.

17:31 bobpoekert: arrdem:

17:31 it has

17:32 but vimclojure is what I have set up

17:32 and replacing my editor environment seems really risky

17:32 bbloom: bobpoekert: https://github.com/greglook/whidbey

17:33 bobpoekert: will just pretty print every evaluation result to nrepl

17:33 bobpoekert: I don’t think vimclojure uses nrepl

17:33 I think it uses nailgun

17:33 bbloom: bobpoekert: time to upgrade to fireplace :-)

17:33 bobpoekert: maybe I’ll do that when I have a spare two days :p

17:33 arrdem: yep it's just using nailgun to manage a raw clojure repl

17:34 aperiodic: FWIW vimclojure-static and fireplace.vim were both painless to set up, in stark contrast to vimclojure

17:34 arrdem: vimclojure is literally the reason I stopped using vim and transitioned to emacs :P

17:34 aperiodic: vimclojure was the worst

17:34 bobpoekert: but I’ve been using vimclojure for years and I have my .vimrc configured around it

17:35 so I’d have to do some work to switch to something else

17:36 arrdem: I think you'll find that switching off of vimclojure to the nRepl tooling will pay off pretty quickly. but that's just my 0.02.

17:39 aperiodic: bobpoekert: well in the meantime, instead of copy-pasting, if you use screen or tmux, you could try the terrible hack that is vim-slime

17:39 https://github.com/jpalardy/vim-slime

17:39 bobpoekert: heheheh nice

17:39 aperiodic: but I agree with arrdem on this, you should put in the work to switch over to the new stuff

17:39 it's great

17:40 arrdem: I was only happy with clojure before making the Emacs jump

17:40 now I'm in love

17:40 but it's your time and you may have deadlines etc.

17:41 I've had the luxury of being able to take a day and fix my tooling for the most part.

17:43 l1x: hey guys what is the best way to process a file that has multiple json entries?

17:43 justin_smith: l1x: it should be trivial to get all of it using cheshire

17:44 arrdem: justin_smith: interesting paper looking forwards to reading it in full

17:46 devn: hikari connection pooling + jtds, ever done it?

17:46 (from clojure)

17:48 justin_smith: devn: have not used that pool, but with other pools it suffices to add a :datasource key to your connection info, with the value being the pool object

17:48 (assuming hikari uses the same interface for jdbc connection pooling that C3p0 does)

17:49 arrdem: Raynes: fs provides no resource handling just "real" files, correct?

17:50 l1x: justin_smith: thanks

17:50 Cheery: Hi. I'm not familiar with clojure. If you were to give it alternative syntax, what would I need to read for that?

17:51 also is there a standard .json parser?

17:51 l1x: data.json

17:51 justin_smith: Cheery: for json, cheshire is best imho, but it comes with data.json

17:52 amalloy: Cheery: alternative syntax? like, you hate parens and want something better, or what?

17:52 arrdem: does anyone have a good hack for (.exists (io/resource ..))?

17:53 Cheery: amalloy: it's bit complicated I've noticed. Well I guess I could show you.

17:53 justin_smith: arrdem: (some? (io/resource foo))

17:53 Cheery: http://cheery.github.io/lisp-editor/

17:54 justin_smith: arrdem: but since false is not a valid URL, you can just check it for truthyness anyway

17:54 Cheery: amalloy: that kind of thing. It encodes it's output in .json, just because I was too lazy to implement an unique format for it.

17:54 l1x: arrdem: https://github.com/l1x/head-to-tail/blob/master/src/head_to_tail/helpers.clj#L23

17:54 like this?

17:55 justin_smith: l1x: a valid resource may not be a file

17:55 arrdem: l1x: yeah that doesn't quite work.

17:55 justin_smith: l1x: it could be something from inside a jar

17:55 arrdem: justin_smith: good catch I didn't realize that io/resource would be nil if a matching file is not found.

17:55 Cheery: amalloy: it's using only a small subset of .json syntax, but to read in as clojure, I'd need to feed clojure something like this: cond:( (a ...) (b ...) else:( ...))

17:55 justin_smith: arrdem: you can count on io/resource returning nil for things not on the classpath

17:56 arrdem: matching resource :)

17:57 amalloy: Cheery: the clojure syntax is the clojure syntax. there's no button to swap to some other syntax. you don't need to use parens or whatever, if you plan to implement your own reader, but you'll still have to pass the compiler the same set of list/vector/map objects

17:57 justin_smith: Cheery: you can make your own parser if you like with instaparse, but why not just generate valid clojure? it's a very automatic-generation friendly language

17:57 bbloom_: and for a proof of concept, don't even bother with a string/file parser, just read in the JSON and write a recursive function to translate it to normal lists/vectors/etc

17:58 then call eval

17:58 justin_smith: (inc bbloom_)

17:58 lazybot: ⇒ 1

17:58 justin_smith: yeah that's smart

17:58 Cheery: hmm.. it's that simple?

17:58 justin_smith: (inc bbloom)

17:58 lazybot: ⇒ 41

17:58 Cheery: okay. I'll do that. :)

17:59 afterwards will do couple screencasts. it'll be fun. hopefully.

17:59 hopefully, clojure has lexical scope?

17:59 and call by value?

18:00 justin_smith: Cheery: yes on both counts

18:00 Cheery: and all the standard data types are immutible

18:00 Cheery: okay. then I know how to use it..

18:00 justin_smith: Cheery: well - as long as you are comfortable coding without mutation - it is much different than normal common lisp code on that count

18:01 Cheery: completely without mutation?

18:01 amalloy: call by value is indistinguishable from call by reference if nothing ever mutates

18:02 Fare: not just without mutation, but also without block / return-from and other control structures.

18:02 justin_smith: Cheery: well, we cheat in some places, but explicit mutation is the exception

18:02 amalloy: Cheery: there are escape hatches to get mutation, but you don't need them much

18:02 Cheery: oh that's insanity. But hey I'll try it before condemning.

18:02 Fare: (does clojure have unwind-protect?)

18:02 justin_smith: Cheery: on the contrary, mutation is insane, don't you want some of this delicious Kool-Ade brand Fruit Drink?

18:03 amalloy: Fare: it has try/catch/finally

18:03 Fare: ok

18:03 Cheery: justin_smith: I have my own thanks :)

18:04 * Fare wanted to use try/catch/finally to implement pythonic try/except/finally... but that doesn't play well with how I translate python assignments into pure bindings in my python dialect :-/

18:05 justin_smith: Cheery: one of the Big Ideas behind Clojure's design is to make it a sane environment for pervasive concurrency. Part of that is eliminating the need for locks by using data structures that implement structural sharing under the hood but don't have a semantics for mutation. We have a few "reference types" that represent a shared, thread safe, value that can be changed safely without breaking concurrently running code.

18:06 Cheery: hmm

18:07 justin_smith: I should probably s/eliminate/vastly reduce/ above

18:09 ,(let [a [0] b (conj a 1)] [a b]) ; Cheery: as an example

18:09 clojurebot: [[0] [0 1]]

18:10 justin_smith: the 0 "cell" is shared by a and b, but no normal code can change a such that b reflects that change (or visa versa)

18:10 though you can do evil things with reflection

18:10 (or knowing a few impl details)

18:10 arrdem: (inc undocumented impl details)

18:10 lazybot: ⇒ 1

18:10 justin_smith: heh

18:10 amalloy: justin_smith: a list is probably better as an example than a vector

18:11 justin_smith: amalloy: fair point

18:11 Cheery: is inc a macro?

18:11 justin_smith: it's a bot command

18:11 amalloy: since they'll be more familiar to another lisper, and because vectors don't actually do much sharing for small vectors

18:11 justin_smith: Cheery: which is confusingly similar to clojure syntax, but completely different in behavior :)

18:11 casperc: i'm wondering, is it possible to make a function that returns the meta data of an input function?

18:11 I want to capture the name and ns of a function at runtime

18:12 Cheery: (inc 1)

18:12 lazybot: ⇒ 8

18:12 bbloom_: Fare: your evaluator is monadic?

18:12 Cheery: hm..

18:12 justin_smith: ,(let [a 0 b (inc a)] [a b])

18:12 clojurebot: [0 1]

18:12 amalloy: casperc: functions don't have namespaces or metadata; only vars do

18:12 Fare: bbloom: yes

18:12 well, it's a compiler, and it's not complete enough to evaluate, yet.

18:12 justin_smith: Cheery: if you use , you can get actual clojure code interpeted, the inc bot command is not clojure

18:12 Fare: getting there, slowly. Didn't make much progress last week.

18:12 Cheery: okay

18:12 ,(inc 1)

18:12 clojurebot: 2

18:12 Fare: most passes are monadic, a few are pure.

18:13 casperc: amalloy: yeah that's my problem i guess, so there is no way to do it at all?

18:13 Fare: the only monad I've been using so far is the state monad

18:13 justin_smith: Cheery: note how in my example I call inc on a, but a does not change

18:13 Cheery: oh wait. inc doesn't need to be a macro. value goes in, value goes out

18:13 justin_smith: right, without mutation, many macros don't have much justification for themselves any more

18:13 amalloy: justin_smith: i'm not really convinced by that

18:13 Fare: right now, I'm working on the code that will evaluate each python statement in the "smallest needed monad".

18:14 arrdem: casperc: well you could alter the defn and fn macros to capture *ns* and soforth as metadata..

18:14 Bronsa: so it looks like vswap! will actually be a macro :/

18:14 amalloy: like, setf doesn't need to exist, but in general i don't see the connection between macros and mutation

18:14 bbloom_: Fare: there's no such thing as the MTL in clojure (as far as i know) nor would ir eally want it... but you can make a custom "python compiler monad" where the context is just a map, one of the things in that map is the state you need, and another thing is envs, continuation prompts, etc

18:14 justin_smith: amalloy: just referring to the need for macros with setf style stuff - we don't have much of that

18:15 Cheery: justin_smith: anyway if there's only few macros, it's nice.

18:15 Fare: the MTL ?

18:15 justin_smith: not that we don't still need macros

18:15 bbloom_: Fare: here's a toy python interpreter in haskell that makes good use of fix & callCC for while loops: https://github.com/mattgreen/hython/blob/e341bd8f2c68ca8ce258cd276e2020205321d440/src/Interpreter.hs#L141-L149

18:15 hiredman: Bronsa: I am not super surprised, rich rarely changes anything he has written

18:15 Fare: bbloom: thanks

18:15 Cheery: you've got callCC and you're doing javascript targets?

18:15 casperc: what I am really trying to do is to capture the input and output of certain functions and save that in a map or something with the ns/function-name as key

18:16 bbloom_: amalloy: i've found that when mutation is involved, i write quite a few more macros

18:16 Cheery: or wait.. that was haskell

18:16 bbloom_: amalloy: nothing that a function + thunk arguments couldn't handle, but evaluation control is more important with effects

18:16 Cheery: do you have call/cc?

18:16 bbloom_: Cheery: no

18:16 Fare: I've been stuck last week on environment continuation analysis: finding which variables are live, whether return / raise / finally need to be captured, etc.

18:16 bbloom_: Cheery: we only have the jvm's exception handling, sadly

18:17 Fare: the trick was proper representation of continuations in while loops.

18:17 (I desugar for into while, so while is my only loop)

18:17 I will also have to put consecutive def into a same letfn, which I'm not doing yet

18:18 bbloom_: seems reasonable to make while primitive, rather than have to deal with fixed point combinators and all that jazz

18:18 Fare: while is my fix-point combinator of sorts

18:18 bbloom_: exactly

18:18 Fare: especially due to the way I transform assignments into bindings

18:19 (but even if I didn't)

18:19 bbloom_: in EClj (which i haven't worked on in months :-/) i modeled normal recursive calls with the y combinator, but modeled recur with the effect system

18:19 Fare: I can't "simply" desugar it into a higher-order function, because that would kill the visibility of the variables.

18:20 Cheery: bbloom_: hilariously I remember why I was repulsed from this language for so long. But I still think it's brilliant idea to implement support for clojure.

18:20 bbloom_: recur was effectively a resumable exception, such that i could model the fact that you don't resume it explicitly

18:20 Cheery: I don't need to like it myself.

18:20 Fare: which visibility becomes a horrible matter in presence of try/except/finally, notably.

18:20 Cheery: repulsed from what language?

18:21 Cheery: from clojure.

18:21 bbloom_: Cheery: your repulsion for clojure is not justified. the jvm, maybe, but clojure is full of damn good ideas that common lispers & schemers should pay attention to... even if it sacrifices many useful features on the alter of host interop

18:21 Fare: bbloom: what does EClj target?

18:21 bbloom_: Fare: right now it's just an interpreter. i have half a JIT compiler written on my local machine i haven't shared yet

18:21 runs on JVM

18:22 Cheery: bbloom_: yes. I think it deserves a look.

18:22 bbloom_: my interpreter is hilarious slow and my jit is hilariously unfinished/broken :-)

18:22 Fare: uh, aren't exception expensive, such that this would make recur expensive?

18:22 Cheery: bbloom_: I also have one non-implemented jit

18:22 :P

18:23 there's nothing wrong in hilariously slow interpreters though.

18:23 bbloom_: Fare: my interpreter is trampolined CPS, not real exceptions, and not monadic either

18:23 Cheery: bbloom_: cheney MTA CPS

18:23 Fare: as in (trampoline #(do that next)) ?

18:24 bbloom_: Fare: not using standard trampoline b/c the thing that bounces on the trampolines contain a reified continuation

18:24 Fare: reified continuation as opposed to what?

18:24 oh, you mean a frame datastructure?

18:25 bbloom_: Fare: yeah, that's what i mean

18:25 Fare: so you can implement, e.g. dynamic variables correctly

18:25 bbloom_: well, sorta

18:25 Fare: don't you then get shift / reset for free?

18:25 (*marginally* free)

18:26 bbloom_: let me clarify: clojure.core/trampoline detects fn? vs answer. and i detect fn?, answer, or "effect", which will talk to the outside world and then resume (0 or more times)

18:26 Fare: yeah, the plan for eclj is to replace try/catch/etc with handle/raise for multi-prompt delimited continuations w/ effect handling

18:27 Fare: e means extended?

18:27 bbloom_: extensible, as in extensible interpreters & extensible effects

18:27 Fare: or is that meant to become clojure 2.0 ?

18:27 bbloom_: nah, it was meant for me to screw around

18:29 just needed something beefier than a toy lambda calculus to explore novel implementation techniques

18:29 amalloy: if bbloom_ had the power to influence clojure 2.0 he'd be doing things less drastic than eclj

18:30 bbloom_: amalloy: absolutely

18:32 i'm not working on it as much b/c i had to resist the urge to make fundamental breaking design changes to clojure, so it stopped being fun

18:32 may go back to it at some point

18:32 or may just take the ideas and do a new lang all together :-P

18:32 Fare: i'm curious to see how your python thing turns out tho

18:33 eric_normand: anyone know of a good resource for learning how to use the Google Closure library?

18:33 I specifically mean the class-oriented stuff

18:33 UI elements and so on

18:34 bbloom_: eric_normand: https://developers.google.com/closure/compiler/docs/js-for-compiler is the best i know of for the "type system"

18:35 eric_normand: bbloom_: thanks

18:36 is Closure, the Definitive Guide any good?

18:36 bbloom_: eric_normand: no idea

18:36 there's also the old wiki: https://code.google.com/p/closure-library/w/list

18:36 see "IntroToComponents" etc

18:36 eric_normand: I've heard good things but the book is from 2010

18:36 and I don't want to plunk down the cash

18:37 bbloom_: but honestly, the closure UI libs are baroque as hell

18:38 eric_normand: yeah

18:39 but the rich text editor works pretty well

18:39 maybe that's the deeper question

18:39 what's the best rich text editor in js?

18:52 danielszmulewicz: Hmm... I'm new to macros. In a macro body, can I replace `(defn ~fname ~args ~@body) with `(defn ~fname [] ~@body) if I know there won't be any args?

18:54 justin_smith: danielszmulewicz: absolutely - a macro just needs to return the form that eventually runs, so a literal [] works fine if that's always the result wanted

18:54 danielszmulewicz: justin_smith: Great. thanks!

18:54 (inc justin_smith)

18:54 lazybot: ⇒ 69

18:54 justin_smith: Duuude

18:54 (sorry)

18:55 danielszmulewicz: (inc justin_smith)

18:55 lazybot: ⇒ 70

18:55 danielszmulewicz: So much fun...

18:55 justin_smith: now I can put that joke away, to be resurrected later when I get 350 more karma

19:02 teslanick: (dotimes 350 (inc ...)) ;; evil

19:04 gfredericks: ,(let [i 0] (dotimes [_ 350] (inc i)))

19:04 clojurebot: nil

19:04 PigDude: is there ever an excuse for calling a function in project.clj, like a large string?

19:04 gfredericks: "calling a function like a large string"?

19:05 PigDude: i don't see much harm of using `str' in project.clj

19:05 gfredericks: oh like to split a string across lines

19:05 PigDude: gfredericks: excuse = "a large string"

19:05 yea

19:05 gfredericks: I don't think anything bad will happen

19:05 and project.clj is not exactly a giant technical-debt-concern

19:05 amalloy: yeah, seems fine to me, although like...you know you can just put a newline mid-string?

19:06 PigDude: amalloy: can't have the extra whitespace, not a big fan of the dedent

19:06 amalloy: OSGi manifest crap

19:06 gfredericks: PigDude: could put it in a file?

19:06 amalloy: PigDude: what's that doing in your project.clj?

19:06 TEttinger: yeah, I'm wondering too

19:07 PigDude: amalloy: hehe a good question. actually it looks like i can have newlines in the setting in question, so no need for (str) actually

19:07 amalloy: clojure project integrating w/ big java service

19:07 hiredman: way not have it in a file and have lein include that file in the jar?

19:07 PigDude: amalloy: builds OSGi module JAR

19:07 hiredman: that sounds like a great idea, how do i do that?

19:08 hiredman: start here https://github.com/technomancy/leiningen/blob/master/sample.project.clj

19:08 amalloy: here is an interesting fact: (def x "y" z) succeeds; (def x y "z") of course fails, but the error message you get is "too many arguments to def"

19:08 PigDude: hiredman: i knew it :)

19:08 gfredericks: lol; hiredman is the master of "read this long thing first"

19:08 PigDude: gfredericks: ah i meant more like, half of leindocs are in that file :)

19:09 hiredman: I mean, I know it is possible, but it isn't like I keep a catalog of all possible lein options in my head

19:09 so it is in there somewhere

19:09 if worst comes to worst just stick it in resources/

19:09 in fact, why not do that?

19:09 PigDude: yea right now i'm using :manifest which seemed good but maybe i'll just break that out of the file

19:10 hiredman: i thought the manifest is top-level, not in resources?

19:10 hiredman: or i probably have no idea what i'm talking about, i'm not much of a 'java guy' yet

19:11 hiredman: oh, it has to go in the jar manifest?

19:11 PigDude: yea

19:11 really long config option

19:11 hiredman: https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L415

19:11 PigDude: i was getting ahead of myself because it actully can have newlines and whitespace

19:11 well there it is from the horse's mouth

19:11 :)

19:12 specifically i wanted to join on commas and didn't want to require but of course i can use absolute reference

19:12 hiredman: you can call slurp or whatever there, even do templating

19:12 PigDude: thanks hiredman !

19:12 hehe `"Grunge-level" my.plugin/calculate-grunginess'

19:12 => "Soundgarden"

19:13 hiredman: clojurebot: leiningen is a product of a grungy little burb just north of seattle

19:13 clojurebot: Roger.

19:17 hyPiRion: leiningen?

19:17 clojurebot: leiningen is behind your back in a good way

19:20 justin_smith: ~leiningen

19:20 clojurebot: leiningen is a product of a grungy little burb just north of seattle

19:25 numberten: is there a way to :keys destructure a map, and have it return an exception if a key is missing?

19:26 right now i'm using :pre to check to see if the keys exist, but I was wondering if something that does that already exists and I just haven't heard of it

19:26 aperiodic: numberten: you may be interested in schema. https://github.com/Prismatic/schema

20:01 casperc: (with-redefs [inc (constantly 1)

20:01 class (constantly 10)]

20:01 [(inc 1)

20:01 (class [])])

20:02 ,(with-redefs [inc (constantly 1)

20:02 class (constantly 10)]

20:02 [(inc 1)

20:02 (class [])])

20:02 clojurebot: #<RuntimeException java.lang.RuntimeException: EOF while reading>

20:02 justin_smith: casperc: the bots only do one liners

20:02 casperc: ,(with-redefs [inc (constantly 1)

20:02 class (constantly 10)]

20:02 [(inc 1)

20:02 (class [])])

20:02 clojurebot: #<RuntimeException java.lang.RuntimeException: EOF while reading>

20:02 casperc: ah

20:03 (with-redefs [inc (constantly 1) class (constantly 10)] [(inc 1) (class [])])

20:03 ,(with-redefs [inc (constantly 1) class (constantly 10)] [(inc 1) (class [])])

20:03 clojurebot: [2 10]

20:04 casperc: hmm, the that redef clearly doesn't work :)

20:06 hyPiRion: inc is inlined, which is why it doesn't work

20:10 BAMbanda: What do you guys suggest as the idiomadic way to consume restful services with clojure

20:11 justin_smith: BAMbanda: for GET, slurp will often suffice. Use cheshire to decode json. For POST etc. clj-http.client is good

20:11 https://github.com/dakrone/clj-http

20:13 BAMbanda: justin_smith, thanks bud

21:07 clojer: Why does this work: (map-indexed (fn [x y] [x y]) [:a :b :c])

21:07 amalloy: why wouldn't it work, clojer?

21:07 clojer: ... but this doesn't: (map-indexed #([%1 %2]) [:a :b :c])

21:08 amalloy: See follow-up

21:08 amalloy: because #(x) is (fn [] (x)), not (fn [] x)

21:10 clojer: amalloy: Don't see the connection with your #(x) example

21:10 dbasch: clojer: because you’re calling a vector as a function

21:10 you want #(do [%1 %2])

21:10 amalloy: #([%1 %2]) is (fn [x y] ([x y]))

21:10 dbasch: no, he wants vector

21:11 dbasch: ,(map-indexed vector [:a :b :c])

21:11 clojurebot: ([0 :a] [1 :b] [2 :c])

21:11 dbasch: &(map-indexed vector [:a :b :c])

21:11 lazybot: ⇒ ([0 :a] [1 :b] [2 :c])

21:12 clojer: dbasch: Tried that but confused with vec instead of vector thinking they were the same :(

21:13 dbasch: is the network lagging?

21:14 amalloy: I sent dbasch: ,(map-indexed vector [:a :b :c]) about 30’ before your comment :)

21:14 amalloy: dbasch: you must have a really terrible internet connection

21:15 or connection to freenode, anyway

21:15 dbasch: amalloy: I’m using astound, which is astoundingly bad

22:37 jkj: strange... lein uberjar does aot compiling alright

22:37 ...or lein with-profile uberjar compile

22:38 but lein compile does not aot compile the class, and import will fail

22:38 cannot figure out what causes this... the class is in project.clj in :aot vector

22:57 hiredman: jkj: you need to put (:gen-class) is the ns form of the class you want compiled

22:58 jkj: hiredman: it has.. and it does compile fine if i just lein uberjar first

22:58 if i lein something else first, then kabom

Logging service provided by n01se.net