#clojure log - Jan 25 2010

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

0:01 tolstoy: what does "keep an index" mean? Adding up something for each row? (Which could be done in SQL itself, which is why I'm confused.)

0:01 somnium: nosql!

0:01 alexyk: tolstoy: it's not SQL, it's mongo!

0:01 getlostsql!

0:01 tolstoy: Heh.

0:02 I guess I was thinking that you could have a fn that took a row, and a results map, and returned a new map with the row's data added in (as necessary).

0:02 Then just use reduce.

0:02 I mean, map reduce, eh?

0:03 alexyk: reduce works, but somehow I found that passing around the transient res is not much speedup

0:03 the while works a transientr

0:03 tolstoy: Ah, so, you're past getting it work. Now you want to do the ugly optimization? :)

0:04 somnium: can just move the while condition into a when in loop-recur?

0:04 alexyk: somnium: forgot how loop looks :)

0:04 (doc loop)

0:04 clojurebot: "([bindings & body]); Evaluates the exprs in a lexical context in which the symbols in the binding-forms are bound to their respective init-exprs or parts therein. Acts as a recur target."

0:05 alexyk: ha -- 1.1.0 sends to RTFurl

0:05 tolstoy: That explanation is nice and clear.

0:05 alexyk: so where do we inc some i?

0:06 in the binding?

0:06 tolstoy: (loop [i 0] ..... (recur (inc i)))

0:07 alexyk: ah ok

0:07 tolstoy: maybe (loop [cursor (init) i 0] .... (recur cursor (inc i)))

0:08 (let [cursor (init)] (loop [i 0} ... (recur (inc i))) ;; no idea what's better style, or faster. Heh.

0:08 somnium: the cursor mutates on its own, so no sense in passing it

0:08 alexyk: yep

0:08 tolstoy: right

0:08 somnium: maybe the JIT can handle those details

0:16 alexyk: so if loop doesn't see recur, it just falls through, as let?

0:16 somnium: yeah, no complaints from the compiler

0:17 maybe well get real TCO some day off in the future (or a clojure-in-scheme implementation)

0:20 wilig: technomancy: Mind if I try my hand at some of the tickets on swank-clojure?

0:20 hiredman: there are patches that add tailcalls to the jvm already

0:22 alexyk: how do I check that something is a number?

0:22 hiredman: (doc number?)

0:22 clojurebot: "([x]); Returns true if x is a Number"

0:23 somnium: hiredman: ooh, any jvm-download to play with?

0:24 alexyk: thx

0:25 hiredman: somnium: no, and it's not automatic tailcalls, you have to emit special bytecode so the clojure compiler would need to add support for it

0:26 http://weblogs.java.net/blog/forax/archive/2009/12/18/tailcall-anyone

0:27 somnium: good timing for ccinc at any rate

0:29 hiredman: cinc could happen right now, it's just a matter of priorities

0:31 it could have happened even earlier too, I think rhickey is just focused on making clojure "good" and cinc is just a subgoal

0:32 somnium: I wonder if the java regex syntax will linger once clojure is on multiple platforms

0:32 hiredman: clojure is tied to the jvm

0:32 somnium: Im mostly interested in seeing what the 'kernel' comes out looking like

0:32 hiredman: I don't that will change

0:32 doubt

0:33 the clr version is also "clojure" it is "clojure.NET"

0:33 er

0:33 the clr version is not

0:33 bleh

0:33 somnium: Im not terribly concerned with how its called :)

0:34 more what it can do and how its different

0:37 hiredman: the point is the clr version is different

0:38 somnium: ah, so you mean clojure on the jvm is unlikely to change

0:38 hiredman: it's unlikely to change its regex support

0:39 somnium: does the clr use the same regex notation? (I have no idea what .NET regex is like)

0:39 hiredman: I think I recall seeing in an email dmiller talking about adding someway to specify stack allocation on the clr

0:39 the jvm doesn't support that so clojure can't do that

0:40 clojure.net can

0:40 I don't know too much about clojure.net either

0:40 alexyk: somnium: I got the name of the option to dissoc :_id :_ns!

0:40 hiredman: infact, it may actually be called clojureCLR

0:41 somnium: ccinc should make it easier(possible) to support those kind of host-specific special forms

0:41 just a new ticket on assembla a few days ago I saw

0:42 alexyk: dismongo

0:42 somnium: alexyk: sounds like a tropical ailment

0:42 alexyk: Microsoft Clojure# 7

0:42 somnium: :D

0:43 alexyk: now with ActiveFn(tm)

0:44 and family license pack, up two repls on a Windows 7 locla network

0:46 hiredman: Windows Evaluator Explorer

0:46 WEE!

0:50 somnium: what to call a scheme-to-C impl? PLTClojure is just not sexy

0:50 cleme

0:50 alexyk: clo#ure

0:50 somnium: how do you pronounce that one?

0:51 alexyk: "violate the EULA and go to jail == #" :)

0:52 somnium: I worked in at least one office that kept a a lone copy of XP locked in a storage closet

0:54 alexyk: is there a core fun to return a seq with nth element removed?

1:00 ,(letfn [(without [s n] (concat (take n s) (drop (inc n) s)))] (without (range 10) 4))

1:00 clojurebot: (0 1 2 3 5 6 7 8 9)

1:25 alexyk: I can manually destructure a map and convert it to a vector like below. Now what if the keys is a parameter?

1:25 ,(let [{:keys [a b]} {:a 1 :b 2}] [a b])

1:25 clojurebot: [1 2]

1:25 alexyk: I can say :keys myparam, but what do I stick into the body?

2:10 LauJensen: Morning team

2:16 replaca: hey lau

2:54 webben: Does anyone know what's happening with Waterfront? Did it cease development early last year?

2:59 somnium: I think the developer started using emacs

3:00 webben: ah interesting

4:00 AWizzArd: ~seen rhickey

4:00 clojurebot: rhickey was last seen quiting IRC, 287 minutes ago

4:11 esj: Morning all

4:11 Nickserv is a bit feisty this am.

4:14 cgrand: esj: Morning

8:25 G0SUB: need help with enlive...

8:26 once I have used select to get a part of a page, can I run select on the selection again?

8:26 that capability will be really useful.

8:38 cemerick: G0SUB: yeah, that shouldn't be a problem

8:38 select is just working over a tree of nodes, and returns a tree of nodes, so those operations can be composed at will

8:39 G0SUB: cemerick: well, it didn't work for me. may be I did something wrong.

8:39 cemerick: also, I need to use an nth-child selector. is that possible?

8:40 cemerick: G0SUB: one sec, I'll see if I can get a simple example together

8:40 G0SUB: cemerick: sure. many thanks.

8:52 cemerick: G0SUB: yeah, super-easy: (-> "http://www.penny-arcade.com/comic/" java.net.URL. html-resource (select [:div]) (select [:a]) count)

8:53 that gives all links that are descendants of divs

8:53 G0SUB: cemerick: looking

8:54 cemerick: I've not used nth-child, but I'll assume that that will drop in however you'd expect

8:54 e.g. to parallel how CSS works, that is

8:55 G0SUB: yeah, changing the first select to (select [[:div (nth-child 3)]]) yields a count of matching links of 14, rather than 67

8:56 (not positive that's correct, but seems perfectly reasonable)

8:56 G0SUB: cemerick: the nth-child syntax is interesting

8:57 cemerick: G0SUB: interesting, as in different than the analogous css?

8:58 G0SUB: cemerick: yes. and is it documented?

8:58 cemerick: cgrand: parenthetically, why take nodes as the first argument to select? I *really* want to use ->> and drop a bunch of maps and then a reduce on the end of a series of selects.

8:58 G0SUB: cemerick: +1

8:58 cemerick: G0SUB: here, I think: http://enlive.cgrand.net/syntax.html (linked from http://wiki.github.com/cgrand/enlive/)

8:59 G0SUB: cemerick: ah

9:01 cgrand: cemerick: G0SUB: because select predates ->> :-)

9:01 you can always use the -> ->> combo

9:01 G0SUB: cgrand: hehe :)

9:02 cemerick: cgrand: boo! ;-)

9:02 cgrand: (-> url (select XXX) (select YYY) (->> (map foo) (reduce bar zero)))

9:03 * cgrand loves combining ->, ->> and doto too much

9:03 chouser: oh. my.

9:03 Why had I never considered putting a ->> inside a -> ?

9:04 cemerick: yeah, that's a new one on me, too :-)

9:04 cgrand: anyway, I'd +1 swapping the arg order if you're game.

9:06 cgrand: I'd like to modify -> and ->> to make the recognize each other so as to switch between thread first and thread last

9:06 so my latest snippet would become (-> url (select XXX) (select YYY) ->> (map foo) (reduce bar zero))

9:07 cemerick: huh

9:07 so crazy, it just might work.

9:09 chouser: why not just have each fn (since they can hold metadata now) declare its threading arg position, then have a single universal ->

9:09 cemerick: chouser: that's not too magical?

9:10 chouser: definitely too magical.

9:10 cgrand: One of my pet peeve is that one can currently upgrades a thread-first to a thread-last using the ->> inside a -> trick. The other way is impossible.

9:11 chouser: it may break some existing code but it's an interesting idea

9:16 chouser: I guess my postfix locals example would quit working.

9:19 jcromartie: what's the best way to make a map from a seq?

9:19 chouser: jcromartie: depends on the shape of the seq

9:19 jcromartie: ([:a 1] [:b 2])? (:a 1, :b 2)? ((:a :b) (1 2))?

9:20 jcromartie: it's a seq of hash-maps

9:20 chouser: so ({:a 1} {:b 2, :c 3}) and you want {:a 1, :b 2, :c 3}?

9:20 jcromartie: and value of one of the keys of these maps will become the key for the new hash-map

9:20 not quite

9:21 ({:a "foo", :b 2}) would become {"foo" {:b 2}}

9:21 I'm thinking reduce

9:22 chouser: I think I need more info. Is :a another input to this function, or else how is it treated differently from :b?

9:22 but yes, likely reduce or into

9:22 jcromartie: got it

9:23 (reduce (fn [x v] (assoc x (:name v) v)) {} @*venues*)

9:23 BTW, (doc reduce) doesn't mention it, but is there a lazy version?

9:23 chouser: can't be

9:24 jcromartie: oh?

9:24 chouser: in this case, for example, you're producing a map. Map objects aren't lazy.

9:24 jcromartie: yah

9:24 nevermind then :P

9:24 chouser: :-)

9:24 jcromartie: I suppose if I were producing a seq I'd be using map

9:26 chouser: this might work too: (into {} (for [v @*venues*] [(:name v) v]))

9:27 cgrand: jcromartie: shouldn't you dissoc :name too?

9:27 jcromartie: not in this case

9:30 actually I'm kind of torn on how to store this

9:30 G0SUB: cgrand: I am trying to scrape the Company column from http://money.rediff.com/tips/2010/01/20

9:30 cgrand: code is here ... http://paste.lisp.org/display/93872

9:30 jcromartie: I guess if order doesn't matter it's probably best to store a hash-map of ids, if I will be accessing it by id most often

9:30 G0SUB: I am not sure why I am getting all these nils

9:31 any advice will be appreciated.

9:31 I think my selectors are wrong

9:31 jcromartie: the content is displayed by JS

9:31 could that be why?

9:31 G0SUB: jcromartie: yes, but there is some markup.

9:32 jcromartie: I am getting the data, but some extra nils. that is the problem.

9:33 I am not sure if I am using nth-of-type correctly

9:34 chouser: jcromartie: btw, what you've got is very close to (clojure.set/index @*venues* [:name])

9:34 jcromartie: hmm

9:34 interesting

9:35 I'll check it out, that's probably better for my case

9:35 chouser: the keys look like {:name "foo"} though, rather than just "foo"

9:36 jcromartie: hmm

9:40 cgrand: G0SUB: looking at it right now, the nil are cause by the selection of the "View" links, looking what's wrong with those selectors

9:40 G0SUB: cgrand: thanks. I am investigating too.

9:44 cgrand: G0SUB: ok, found it, let me paste it

9:48 G0SUB: http://paste.lisp.org/display/93872#2 the problem was with (select [:td (nth-of-type 1)])

9:49 G0SUB: cgrand: ah, I never understood the syntax properly. many thanks.

9:49 cgrand: CSS numbering starts at 1

9:49 G0SUB: cgrand: btw, is there anyway the :a selector can be combined with the :td one?

9:51 cgrand: and in [:td (nth-of-type 1)], (nth-of-type 1) applies to a descendant of :td not to td itself, you have to wrap them in a vector to have a "and" (while the outermost selector always mean chaining)

9:51 G0SUB: cgrand: understood now. thanks a lot.

9:52 cgrand: G0SUB: just (select [[:td (nth-of-type 1)]]) to (select [[:td (nth-of-type 1)] :a])

9:53 (and remove the other select of course)

9:53 G0SUB: yeah

9:53 the issue was with the nested vector

9:53 cgrand: err I mean (select [[:td (nth-of-type 2)] :a]) with a 2 not a 1

9:54 G0SUB: cgrand: got it :)

9:56 cgrand: is there an easy way to select the :content directly? something like text in xpath?

9:58 cgrand: G0SUB: sure: text for a single node or texts for a seq of nodes

9:58 G0SUB: ok

9:59 cgrand: (-> url (select XXX) texts)

10:01 G0SUB: cgrand: is texts public?

10:02 cgrand: did you get enlive from clojars?

10:02 G0SUB: yes

10:04 cgrand: oops, it is slightly out of date

10:04 G0SUB: cgrand: can you kindly push a new version?

10:05 cgrand: but texts is simply (defn texts [nodes] (map text nodes)) and you have #'text, right?

10:05 G0SUB: not right now, I'm sorry

10:06 G0SUB: cgrand: no problem.

10:06 cgrand: yes, but I want to get rid of the unnecessary map

10:07 cgrand: in the mean time, use your own "texts" (pasted above) or get enlive from github

10:07 "the unnecessary map"?

10:09 G0SUB: cgrand: the map to get the texts inline. anyway, I will write my own texts. thanks.

10:11 * stuartsierra is getting ready to merge the "maven" branch of clojure-contrib

10:12 cemerick: nice

10:12 stuartsierra: I've got a rough patch for duck-streams that adds a dispatch to reader for Seqable -- interested?

10:15 G0SUB: how do I do a case insensitive regex matching in Clojure?

10:15 cemerick: G0SUB: use the 'i' flag in your regex

10:16 G0SUB: cemerick: any examples?

10:16 chouser: #"(?i)foo"

10:16 G0SUB: ok

10:17 * cemerick is so happy to have such a capable regex lib

10:18 cemerick: about the only thing I miss from python's is named groups

10:19 chouser: yeah. but hardly anything has named groups

10:20 I once chose python for a project exclusively because of the named groups. They were needed for the little DSL I wanted.

10:21 jcromartie: I still can't believe that the iPhone SDK doesn't ship with any regex capabilities.

10:21 cemerick: chouser: I mean the feature where you can name capturing groups, and retrieve them by their name, rather than idx.

10:22 stuff like the numeric regexes in the reader scream for something like that

10:23 stuartsierra: cemerick: how does it convert a Seqable to a reader?

10:25 cemerick: lisppaste8: url?

10:25 the bot is dead :-/

10:26 stuartsierra: http://paste.lisp.org/display/93877 compose-paths would need to turn into a multimethod dispatching on the first arg -- the String case would reuse URL/File creation bits from the String case of reader.

10:27 chouser: cemerick: yes

10:27 cemerick: I knew exactly what you meant

10:28 cemerick: chouser: ah, I didn't grok the 'hardly anything' msg.

10:28 chouser: I mean, almost no regex engines support the named groups

10:28 cemerick: right, I get what you were saying now

10:29 Python's is the only one I know of.

10:29 and the regex engine I wrote :-P

10:29 chouser: the syntax is ugly, but that's hardly new for a regex feature. :-P

10:29 cgrand: chouser: cemerick: http://paste.lisp.org/display/93878 :-P

10:29 stuartsierra: cemerick: So the idea is that (reader ["foo" "bar" "baz"]) would return (BufferedReader. (FileReader. (File. "foo/bar/baz"))) ?

10:30 cemerick: stuartsierra: roughly, though File/URL would handle the canonicalization.

10:31 cgrand: Looks nifty. Forgot contrib.core/-?> and (soon to come, hopefully) -?>>

10:32 That's the only downside to parsing the forms, I suppose.

10:32 stuartsierra: cemerick: I dunno, that looks a bit too magical to me.

10:32 cemerick: i.e. having to be explicit about which threading forms are supported

10:33 cgrand: cemerick: unless you register them all in a *threading-forms* var

10:33 cemerick: stuartsierra: heh, fair enough

10:33 cgrand: I think you forgot the ;-) in that one

10:33 ;-)

10:34 chouser: hm... would these all play nicely with destructuring-> ?

10:35 cemerick: stuartsierra: I've just been accumulating seqs of file paths all over the place, and doing (-> some-seq path-norm-fn slurp*) too much. :-)

10:35 cgrand: chouser: is your patch on assembla?

10:35 stuartsierra: cemerick: doesn't c.c.java-utils/file do that?

10:35 chouser: cgrand: http://www.assembla.com/spaces/clojure/tickets/211

10:35 I think it might "just work"

10:37 cgrand: chouser: me too

10:37 more destructuring fun! ;-)

10:39 chouser: btw I realized that -> and ->> could be shadowed but thankfully we have &env now

10:39 jcromartie: is it OK to throw exceptions in clojure

10:39 ?

10:39 cemerick: stuartsierra: didn't know about that, but file doesn't handle URLs *shrug*

10:40 jcromartie: I don't really see any special attention paid to it in the docs

10:40 alexott: is anybody know - who now maintains clojars? mail, specified at site isn't working

10:41 chouser: jcromartie: sure, throw try and catch all work

10:41 jcromartie: ah, throw is a special form, then?

10:41 chouser: yes

10:41 jcromartie: I was expecting a macro or function ("Unable to resolve symbol: throw in this context") in my search

10:42 cemerick: huh, I didn't notice as-url before though

10:42 jcromartie: fun with throw...

10:42 ,(throw)

10:42 clojurebot: java.lang.NullPointerException

10:42 chouser: heh. reasonable default. :-)

10:42 jcromartie: that's the worst thing in Java, hands down

10:42 chouser: ,(throw (Exception. "do not want"))

10:42 clojurebot: java.lang.Exception: do not want

10:44 jcromartie: where are the various REPL vars documented?

10:46 stuartsierra: jcromartie: dysinger maintains clojars I think

10:46 jcromartie: wrong guy, stuartsierra

10:46 alexott:

10:46 * jcromartie reads main.clj

10:46 stuartsierra: oh

10:46 right

10:46 jcromartie: *1 *2 *3 *e

10:46 is that it?

10:49 stuartsierra: *warn-on-reflection*

10:50 *print-dup*

10:53 jcromartie: those arent' repl-specific, though

10:54 how long has *print-dup* been around?

10:54 I ran into some issues printing cycles

10:55 stuartsierra: *print-dup* has been around for a long time, not well documented

10:55 jcromartie: hmm, but I guess *print-dup* doesn't do what I think it does

10:55 stuartsierra: I don't think Clojure can print cycles.

10:55 alexott: stuartsierra: thanks, i'll write to him

10:56 stuartsierra: alexott: Oh, wait, there's someone else

10:56 "_ato" I think

10:56 Whoever that is.

10:57 jcromartie: ,(let [x (ref {}) y (ref {})] (dosync (alter x assoc :y y)) (dosync (alter y assoc :x x)) x)

10:57 clojurebot: #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #<Ref@5b1cff: {:x #<Ref@ff78e9: {:y #}>}>}>}>}>}>}>}>}>}>}>}>}>}>}>

10:57 jcromartie: clojurebot: was that fun?

10:57 clojurebot: No entiendo

10:57 jcromartie: I find it interesting that it stops at some point

10:57 chouser: jcromartie: http://paste.lisp.org/display/83647

10:58 jcromartie: the {:y #} is because of *print-level*

10:58 jcromartie: ah

10:59 handy

11:01 DeusExPikachu: when structuring a lib, for example, (ns foo (:use bar.core)), clojure tries to load /foo/core, instead of /foo/core.clj, any other filename except core seems to work. Is the symbol core special?

11:01 Chousuke: core should work just fine

11:02 many libraries use similar naming

11:02 DeusExPikachu: hmmm must be something else in my code, nm

11:13 CalJunior: I would like to create a subvector from an existing vector on multiple non-contiguous indices like so: (nth [10 12 13 14 15] '(1 3)) and return (12 14)

11:13 jcromartie: oi vey... what's a good way to find EOF-while-reading errors?

11:13 or rather the source of them

11:15 Emacs indentation!

11:15 huzzah!

11:15 CalJunior: I would like to create a subvector from an existing vector on multiple non-contiguous indices like so: (nth [10 12 13 14 15] '(1 3)) and return (12 14) but I get an exception.

11:16 stuartsierra: clojure-contrib master branch is now converted to Maven.

11:16 chouser: CalJunior: try 'map' instead of 'nth'

11:16 jcromartie: CalJunior: why do you think nth takes a list of indexes?

11:17 CalJunior: map, thanks

11:17 stuartsierra: I think what you want is (map #(get the-vector %) [10 12 13 14 15)

11:17 CalJunior: jcromartie: I just did.

11:17 chouser: stuartsierra: vectors are fns

11:17 :-)

11:17 ,(map [10 12 13 14 15] '(1 3))

11:17 stuartsierra: yeah

11:17 clojurebot: (12 14)

11:18 stuartsierra: oh, yeah

11:18 that looks funny, but it works

11:18 CalJunior: clojure: if it's not simple, you're not doing it right :-)

11:19 chouser: seriously. That's deliciously close to true.

11:20 DeusExPikachu: hmmm, I don't think, in swank-clojure.jar, namespace-to-path accounts for proper the possibility of needing to translate from underscore to hyphen when going from pathname to namespace

11:21 dabd: is clojure-contrib master in sync with clojure 1.1.0?

11:21 DeusExPikachu: cause I'm getting a "no namespace: foo_bar.core found", for the ns foo-bar.core defined in file /foo_bar/core.clj

11:26 stuartsierra: dabd: no, it's in sync with Clojure master

11:26 dabd: there are 1.0.x and 1.1.x branches of contrib that map to corresponding versions of Clojure

11:26 * stuartsierra is ready to release final 1.0.0 and 1.1.0 packages of contrib

11:29 dabd: is it recommended to use clojure + clojure-contrib 1.1.0 or clojure + clojure-contrib master?

11:29 DeusExPikachu: to be more precise, the call to ns-name in namespace-to-path is being fed foo_bar.core, which doesn't exists, I believe this is traced to the (.getClassName frame) in source-location-for-frame

11:30 Chousuke: hmmh

11:31 stuartsierra: dabd: depends on what you want. If you want a stable target, use 1.1.0. If you want to play with deftype/defprotocol, use master.

11:33 dabd: stuartsierra: thx

11:34 angerman: does clojrue support an easy way to merge two functions?

11:34 stuartsierra: merge how?

11:34 angerman: e.g. we have empty? now I want to extend empty? for another type.

11:34 basically a multifn

11:35 stuartsierra: angerman: that is not possible right now, but will be possible with the addition of protocols

11:35 Chousuke: you can redefine functions though, but doing that for core fns is rather evil :P

11:35 angerman: stuartsierra: ok. For now it would work if every function was a multifn dispatching on input type

11:35 stuartsierra: angerman: yes, but they aren't :)

11:36 angerman: Chousuke: yep. like using clojure core, except empty or renaming empty and wrapping it.

11:36 ok. so protocols are the way to get that

11:36 good to know

11:36 Chousuke: but (let [old-empty empty?] (alter-var-root #'empty? (constantly (fn [...] (...))))

11:36 stuartsierra: look at my Tuple examples for how that can be done with deftype/defprotocol

11:37 jcromartie: yay for atomic file saves

11:37 angerman: Chousuke: ohh, i've never dug that deep down.

11:37 Chousuke: very evil, but possible :P

11:37 jcromartie: I want to be able to ^C my server

11:37 angerman: stuartsierra: thanks.

11:37 jcromartie: and not lose data

11:37 angerman: jcromartie: doesn't ^C just send a signal to the process?

11:37 DeusExPikachu: for swank-clojure, is inspecting and evaling in the debugger not supported?

11:38 jcromartie: yeah but if it's in the middle of something like duck-streams/spit it will leave me with a junk file

11:38 Chousuke: jcromartie: you can't do file writes atomically but renames are possible as far as I know.

11:38 jcromartie: I'm saving with a watch on a ref instead of using a database

11:38 yes

11:38 that's what I mean

11:38 angerman: jcromartie: hmm. can you not catch the ^C signal, do cleanup and exit?

11:38 jcromartie: I dunno

11:39 * angerman though ^C was SIGTERM but maybe i'm wrong.

11:39 jcromartie: haven't tried it

11:39 yeah it sends a signal

11:39 but this is a compojure app

11:39 not sure how to wire that up

11:40 stuartsierra: signal-handling is OS-specific, you need classes in sun.* to do it

11:41 angerman: and then it's probably though the application server layer that's killing the servelts

11:47 replaca: angerman: ^c is sigint

11:48 angerman: replaca: ohh. thanks. I hope it sticks this time :D

11:48 replaca: sigterm is what kill sends by default. There's no keyboard version of it

11:48 angerman: and sigkill is -9?

11:49 replaca: yeah,

11:50 but you can't catch it

11:51 jcromartie: ah, yikes, apparently duck-streams can't write Date objects?

11:51 that's kind of critical

11:52 angerman: (.toString date-obj)?

11:52 I'm sure it can write that one

11:52 replaca: jcromartie: I think that's kind of orthogonal to duck-streams

11:52 jcromartie: duck-streams just gives you readers and writers

11:53 jcromartie: so I need to transform every Date tucked into every nook and cranny of my data and also somehow catch them on the way back in

11:53 sounds like fun

11:53 replaca: jcromartie: That's generally true of Java objects in Clojure :-(

11:54 hiredman: jcromartie: what do you mean duck-streams can't write Date objects?

11:54 jcromartie: so there's no Clojure-y way to use dates, I take it?

11:54 I mean it writes an unreadable form

11:54 replaca: we really needs to have some sort of hybrid serializer

11:54 hiredman: I don't really use ds but I believe it just provides a stream

11:54 it's up to you to do the reading and writing

11:54 jcromartie: yeah

11:54 I guess I could store timestamps

11:55 replaca: jcromartie: that's right - dates are just java objects to clojure

11:55 chouser: You can add a readable print method for Dates if you want.

11:55 hiredman: objects are printed using the print-method multimethod so you can add your own dispatch to that

11:55 jcromartie: ah

11:57 replaca: chouser, hiredman: good call

11:58 angerman: jcromartie: did you look at the astraction crafting from Full Disclojure?

11:58 jcromartie: no

11:59 I'm reading/writing dates now though

11:59 (defmethod print-method java.util.Date ...)

12:00 angerman: jcromartie: well idea behind the episode is representing Date classes as Long values.

12:00 jcromartie: ah

12:01 angerman: -> http://vimeo.com/8801325

12:04 stuartsierra: clojure-contrib 1.0.0 and 1.1.0 final releases are up! ZIPS at http://code.google.com/p/clojure-contrib/ and Maven artifacts at http://build.clojure.org/releases

12:05 chouser: yay!

12:05 stuartsierra: thank you so much for doing that.

12:05 technomancy: thanks stuart!

12:06 stuartsierra: You're welcome, all.

12:06 LauJensen: technomancy - How do I get swank-clojure to work with latest pulls of c & c-contrib ?

12:08 jcromartie: brilliant stuff angerman thanks

12:09 angerman: jcromartie: it's one of the really worthwhile screencasts, doing a great tribute to clojure

12:09 jcromartie: much better than my printing a Date constructor :P

12:12 angerman: you just hav to print (date <long-date-format>) though I think

12:12 I'm still not sure it's sufficient if you need TZ info

12:12 hiredman: #=(date long)

12:13 #= is read time evaluation

12:14 * angerman notes hiredman is helpful on any instance. :(

12:14 angerman: that was supposed to be a :) smily

12:21 esj: angerman: yeah, right this very moment Sean is working on putting TZ content into this library within Incanter.

12:21 * angerman wonders if he should give libsvm a JNA try.

12:22 angerman: java -> file -> libsvm -> file -> java -> ... seems just not "perfect"

12:25 StartsWithK: (defn str-plus [(-> (Integer/parseInt a)) (-> (Integer/parseInt b))] (+ a b)) in the 1.2 this will work? why?

12:26 Chousuke: it will?

12:26 StartsWithK: .. without a wrong place for right paren

12:26 i just looked at destructuring -> and ->> patch

12:26 Chousuke: ah, right, that.

12:26 StartsWithK: and it will apply to fn to

12:26 Chousuke: well, it's just an extension to the existing destructuring syntax

12:26 StartsWithK: hmm

12:26 why?

12:26 clojurebot: http://clojure.org/rationale

12:27 Chousuke: StartsWithK: probably because it's sometimes useful to apply functions to things.

12:28 StartsWithK: (let [(-> str a) 1]) vs (let [a (str 1)]), the second one is even shorter

12:28 Chousuke, in function arguments? don't we have a better place for that

12:28 like function body..

12:29 chouser: StartsWithK: that patch is not approved

12:29 Chousuke: chouser: it is in approved backlog though.

12:29 StartsWithK: yet :)

12:30 i can't write any expression that would be shorter with that extension, maybe i'm not trying that hard

12:30 is extra 'let' that a big of the deal for people?

12:32 Chousuke: probably not.

12:32 StartsWithK: (defn str-plus [a b] (+ (Integer/parseInt a) (+ (Integer/parseInt b)))) is shorter, (let [a (str 1)]) too

12:32 chouser: StartsWithK: it gets more interesting with more deeply-nested destructuring

12:32 StartsWithK: chouser, example?

12:33 (defn str-plus-in-map [{(-> (Integer/parseInt) a) :num} {(-> (Integer/parseInt) b) :num}] (+ a b))

12:34 (defn str-plust-in-map [{a :num} {b :num}] (+ (Integer/parsInt a) (Integer/parseInt b)))

12:34 still shorter, and more readable

12:40 * angerman doesn't get what tried to being archived. :(

12:54 jcromartie: man, that abstraction grafting video was great

14:01 dsop: hmm I'm new to clojure and lisp at all and I have a question. I try to do a (gen-class) so I create a (ns) and use an import but in the defn the types imported cannot be resolved

14:03 * cemerick cringes every time he uses slurp and spit

14:04 hiredman: eh?

14:05 dsop: so I'm not sure how to import a class from a java lib like foo.bar.Baz and then use just the reference Baz in the further code

14:06 technomancy: cemerick: I usually do sound effects whenever I type them

14:07 hiredman: dsop: using ns or just using import?

14:07 cemerick: dsop: (import 'foo.bar.Baz) at the repl, or (:import foo.bar.Baz) in ns

14:07 dsop: using ns

14:07 hiredman: (:import (foo.bar Baz))

14:08 I mean, cemerick's will work, but java being java you will want to import more classes from the package

14:08 cemerick: I'm guessing it's one step at at time in the early days :-)

14:08 dsop: hmm probably. In that case I try to access an enum from a class

14:09 :)

14:09 cemerick: that'd be Classname/ENUM_VALUE

14:10 dsop: arg

14:10 * dsop feels stupid

14:15 joshua-choi: Is there a standard sequence function so that (mystery [4 5 6] [2 3 4]) -> ((4 2) (5 3) (6 4))?

14:15 chouser: ,(map list [4 5 6] [2 3 4])

14:15 clojurebot: ((4 2) (5 3) (6 4))

14:15 joshua-choi: Ah, thanks

14:16 cemerick: dsop: no worries :-)

14:18 dsop: cemerick: so it should be http://pastebin.com/m7717b71e

14:19 cemerick: dsop: type is an inner enum?

14:19 Centrality.Type, that is?

14:19 dsop: yes

14:20 cemerick: If so, it needs to be specified as Centrality$Type in the import (java inner classes are delineated by $ in the JVM -- javac just plasters over it for Java)

14:20 Otherwise, that looks OK (though I certainly don't know anything about the APIs you're working with)

14:21 dsop: cemerick: works! thanks a lot

14:21 probably not the simples thing to start using closure with :)

14:21 cemerick: dsop: no problem :-D

14:21 yeah, gen-class is definitely near the deeper end of the pool

14:50 stuartsierra: it might be worth parameterizing the clojure version so that people can bounce back and forth using system properties if they're so inclined, and so that folks don't have to open a "scary" xml file to use a particular version *shrug*

14:51 is there a reverse-map somewhere, or is (->> m (map reverse) (map vec) (into {})) the best there is?

14:52 stuartsierra: cemerick: yes, that's not a bad idea

14:52 cemerick: clojure.set/map-invert

14:52 cemerick: I use clojure.version as the property, FWIW

14:53 stuartsierra: thanks. Odd that it's in set.

14:55 stuartsierra: cemerick: Is there a simple way to allow people to "inject" their own clojure.jar as they would with the Ant build?

14:57 the-kenny: There's map-invert? Cool!

14:57 ,(use 'clojure.set)

14:57 clojurebot: nil

14:57 the-kenny: (doc map-invert)

14:57 clojurebot: "([m]); Returns the map with the vals mapped to the keys."

14:57 * the-kenny has always done (hash-map (vals map) (keys map))

14:57 stuartsierra: I think you mean zipmap

14:57 cemerick: stuartsierra: I don't think so. You *might* be able to wire up a target that deployed a provided file locally, and then set the appropriate clojure.version to something unique.

14:58 the-kenny: stuartsierra: Uh, yeah. Sorry

14:58 stuartsierra: cemerick: nah, too complicated

14:58 cemerick: yeah, I agree

14:59 stuartsierra: ok, committed & pushed

14:59 cemerick: Ant is like a band-aid: one motion, right off!

15:01 LauJensen: clojurebot: ant is like a band-aid: one motion, right off! <cemerick>

15:01 clojurebot: Alles klar

15:01 cemerick: oh, good

15:01 That's gonna end up being my epitaph now. :-P

15:05 stuartsierra: Should the clojure-contrib version string have a branch name in it, like Clojure?

15:07 chouser: what's the alternative?

15:07 alpha/beta?

15:07 the-kenny: Das teta

15:07 s/Das //

15:08 stuartsierra: Right now it's just "1.2.0-SNAPSHOT"

15:10 cemerick: stuartsierra: I don't think the branch names in versions have panned out very well. e.g. when new got merged into master, 1.1.0-master-SNAPSHOTs were being churned out after 1.1.0 was released, containing stuff from the new branch

15:10 stuartsierra: yeah, that was messy

15:11 That was because no one updated the version numbers, though.

15:11 cemerick: insofar as what is on a branch can change, it doesn't seem like that should leak into the version

15:11 stuartsierra: The only advantage was the ability to create snapshots of different branches.

15:12 cemerick: yeah, but still; really, 1.1.0-new-SNAPSHOT probably should have been 1.2.0-SNAPSHOT from the beginning.

15:12 technomancy: branch names are valuable if there's a branch of clojure that breaks AOT-compatibility with master of the same snapshot version number

15:12 if that happens again we should think about it

15:12 but putting "master" in the version number seems superfluous; it should be considered the default

15:12 cemerick: technomancy: my point being, if that's about to happen, then the version numbers should diverge.

15:13 technomancy: why not put the branch in the version only for non-masters?

15:13 cemerick: that's a thought, as long as branch names never get reused

15:14 technomancy: if they get re-used within a single snapshot version then we're in trouble. =)

15:15 cemerick: sort of the opposite of what happened with 1.1.0-master-snapshot, but I'd say it's possible :-)

15:17 alexyk: I'm loading an array of triples [x y val], to be added to a graph {x {y val}}. Doing it via (assoc-in graph [x y] v) is painfully slow. How should I structure the transient to speed it up?

15:17 hiredman: vector

15:18 (as in, "that is a vectory, not an array")

15:21 alexyk: vector, right. Should I have transient map of transient maps, or transient of regulars, or what? I have about 3 million top-level keys, with about 30 inner keys.

15:24 dsop: has someone tried yet to put clojure code into a jar file and load it dynamically to runtime?

15:24 I mean load the compile classes

15:25 it seems that I cannot convince the clojure class loader to search for the .clj file in the actual jar . the loader seems to try to load it with the system class loader

15:25 alexyk: what I think is seriously lacking is a transient multi-level map with a clear way to update a key on a path. So far it's not at all clear how to do that.

15:25 cemerick: dsop: if you have .clj files in a jar, you need to load them via RT.load -- at that point, they'll be compiled

15:25 dsop: the jar needs to be on your classpath, regardless

15:25 chouser: alexyk: I think rhickey has a plan for that, currently called 'cells'

15:26 alexyk: chouser: super!

15:26 cemerick: ut oh, gonna tick off the constraints folks :-P

15:26 alexyk: I've killed two JVMs today with Clojure running out of swap with 64 GB RAM. Hope cells show up before my deadline of 2/2! :)

15:26 dsop: cemerick: hmm this would make the classloader code depend on clojure. with scala it works that you put the library.jar in your classpath and you then can load other scala classes dynamically

15:26 cemerick: I'd say it's time for binding* (serial-binding)

15:26 chouser: probably needs a better name

15:26 technomancy: oh, that's what cells are about.

15:27 chouser: well, that's one related feature

15:27 dsop: cemerick: so without the RT.load trick there is no way for me to load clojure compiled class files with let's say URLClassLoader

15:27 hiredman: you can drive the asm library in clojure to generate a classfile that has no dependency on clojure

15:27 cemerick: dsop: oh, you've AOT-compiled to classfiles already?

15:28 dsop: aehm

15:28 cemerick: if you've got a (:gen-class) form in your ns, and you've compiled that file so that .class files are emitted, then you can put those classfiles in a jar and access them using the name of the originating namespace (by default)

15:29 hiredman: cemerick: I imagine he is running (compile 'some.namespace), and then trying to goes his merry way using the generated class

15:29 dsop: hiredman: what other way then compile should i use?

15:29 hiredman: the problems with this are many, the most obvious being the class and the namespace have the same name

15:29 cemerick: hiredman: really? Scala doesn't do anything of the sort.

15:30 alexyk: what I'm pondering now is inserting into ConcurrentHashMap; but then I'd have to convert it to a {x {y val}} graph -- is there a way?

15:30 dsop: I use (:gen-class), (compile) and put the stuff into a jar

15:30 hiredman: cemerick: huh?

15:30 dsop: best to be more specific about your process

15:30 but gen-class is not for dynamic code generation

15:30 cemerick: dsop: good, so if you then add that jar to the classpath of whatever app you want to run, you can access those generated classfiles as if javac had produced them.

15:32 dsop: hiredman: I have a outdegree.clj with a gen-class. I then use (compile 'outdegree) to compile .class files from it, I put them into a jar file and try to load the outdegree.class using javas URLClassLoader which should resolve references to other .class files i nthe same jar

15:32 hiredman: dsop: the first problem you need to addess is your namespace

15:32 ~compile

15:32 clojurebot: the unit of compilation in clojure is the namespace. namespaces are compiled (not files). to compile a namspace the namespace needs to be on the classpath and so does ./classes/ (and the directory needs to exist) because clojure writes the class files to that directory. http://clojure.org/compilation

15:33 dsop: hiredman: now in this case it aborts with FileNoutFound Cannot locate outdegree_init.class or outdegree.clj on classpath

15:33 hiredman: dsop: read from clojurebot

15:34 are you sure you need to gen-class?

15:34 if you don't, then don't

15:34 dsop: hiredman: yes I already did that

15:34 hiredman: dsop: nah, you obviously didn't

15:34 dsop: hiredman: yes, because I the plugin mechanism that uses the URLClassLoader doesn't know about clojure

15:35 hiredman: oh

15:35 sorry

15:35 wrong one

15:35 ~namespace

15:35 clojurebot: excusez-moi

15:35 hiredman: ~namespaces

15:35 clojurebot: namespaces are (more or less, Chouser) java packages. they look like foo.bar; and corresponde to a directory foo/ containg a file bar.clj in your classpath. the namespace declaration in bar.clj would like like (ns foo.bar). Do not try to use single segment namespaces. a single segment namespace is a namespace without a period in it

15:35 hiredman: thats the one

15:36 dsop: hiredman: I use the ns name net.experimentalworks.clojure.outdegree. my file compiles to net/experimentalowrks/clojure/outdegree.class (and all other auto classes, etc) I then put this net/ dir in the jar

15:36 hiredman: ok

15:37 dsop: java loads it, it then calls colojure.lang.RT to complete the process and RT fails as it searches the standard class loader

15:37 if I don't load it dynamically but put the jar into the classpath during startup it works

15:37 hiredman: again

15:37 please be clear about what you are doing

15:38 you are running launching the clojure repl then running compile, then trying to load the class file from a jar using a urlclassloader, all from the same repl session?

15:39 dsop: sure, as I said earlier, gen-class is not for dynamic code generation

15:39 dsop: hiredman: no I have a outdegree.clj with a gen-class in it. I run compile from the REPL. then I close the repl session put the generated class files into a jar file (http://pastebin.com/d2eb94aa) Then I load the .jar file from a java application using URLClassLoader.

15:40 hiredman: dsop: ah

15:40 dsop: and then I try to instantiate net.experimentalworks.clojure.outdegree

15:40 cemerick: oh

15:40 dsop: you need clojure on the classpath as well

15:40 hiredman: and you have clojure.jar on the classpath for the java app?

15:40 dsop: everything works unti lthe actual initialization. Also the Class<?> file is returned and loaded correctly

15:40 yes I have clojure in the classpath

15:41 hiredman: dsop: where is the exception?

15:41 like, did you pastebin it somewhere?

15:41 dsop: one moment

15:43 StartsWithK: ,(-> 1)

15:43 clojurebot: 1

15:43 StartsWithK: ,(->> 1)

15:43 clojurebot: java.lang.IllegalArgumentException: Wrong number of args passed to: core$--GT--GT-

15:44 StartsWithK: shouldn't (->> 1) also return 1

15:44 dsop: hiredman: cemerick http://pastebin.com/d242dbc4f

15:44 hiredman: dsop: looks like a classloader issue

15:45 dsop: hiredman: for me it looks that clojure always searches for the acutal _files_ in the system classloader

15:45 and the system class loader doesn't know about the jar at all

15:45 hiredman: dsop: well, presumably you have clojure.jar loaded with the system loader

15:45 dsop: yes for sure, otherwise .RT wouldn't be found

15:46 hiredman: I think the issue is clojure.jar and your jar have different classloader roots

15:46 so they can't interact with each other

15:46 dsop: yes for sure they have

15:46 the clojure.jar is loaded by the system loader

15:46 but that brings me to an idea

15:46 cemerick: hiredman: but net.experimentalworks.clojure.outdegree is being loaded just fine, just not __init -- seems like all the generated classfiles aren't making it into the jar

15:46 dsop: hiredman: thanks so far for the help

15:46 cemerick: dsop: ^^ meant for you

15:47 hiredman: cemerick: yeah, the init stuff fails to load because it tries to talk to clojure

15:47 dsop: cemerick: yes but the __init file is in the jar

15:47 hiredman: and it's classloader doesn't know clojure

15:47 or something

15:47 dsop: it's because the RT earches for the __init file

15:47 hiredman: yes I guess so too, thanks for the help

15:48 cemerick: hiredman: if that were true, then it should fail in net.experimentalworks.clojure.outdegree.<clinit> trying to get access to Var/RT

15:48 dsop: I proberbly do nasty stuff here :)

15:48 hiredman: cemerick: right

15:48 new theory

15:48 dsop: cemerick: the point is the urlclasloader can access the system class loader so it can load RT

15:48 hiredman: it's the check to see if the class file or the clj file is newer

15:48 dsop: but the RT doesn't know the urlclassloader

15:48 cemerick: dsop: you're running in Jetty, so you're a long way away from the system classloader

15:49 dsop: cemerick: true :)

15:49 cemerick: dsop: how are you providing your classpath to jetty?

15:49 dsop: cemerick: default classpaths in the WEB-INF/ directory, which is handled by gwt stuff

15:49 hiredman: RT's load stuff checks to see if the *.clj or the *.class is newer and loads the newest one

15:50 so that might be the actual point of failure

15:50 which is more promising

15:50 cemerick: dsop: and you have clojure.jar and your jar in WEB-INF/lib?

15:50 hiredman: (easier to deal with. maybe.)

15:51 dsop: cemerick: no I have clojure.jar in my WEB-INF/lib, but my jar is loaded dynamically from somewhere. It shouldn't be in the systems/jetty classpath

15:51 cemerick: well, there we go

15:51 dsop: why?

15:52 dsop: cemerick: because you should put jars somewhere, reload the servlet and be able to load new jars without touching the .war file

15:52 cemerick: somekind of 'plugin system'

15:52 they basically just contain algorithms that should be loaded to runtime

15:52 cemerick: dsop: what is this "plugin system"?

15:53 dsop: cemerick: it's bascially just searching for jars in a directory and initializing a given class out of it, during runtime

15:53 cemerick: dsop: this is something you wrote?

15:53 hiredman: http://github.com/hiredman/clojure/blob/master/src/jvm/clojure/lang/RT.java#L402 <-- this is the exception you are seeing

15:53 er

15:54 http://github.com/richhickey/clojure/blob/master/src/jvm/clojure/lang/RT.java#L409 <-- this one

15:55 dsop: cemerick: yes.

15:55 hiredman: yes this is it

15:55 cemerick: I'm not saying it's perfec,t but it works for java and scala stuff so far

15:56 cemerick: dsop: then, in general, you've got a bug or design flaw in how you're integrating with your parent (jetty's) classloader

16:20 defn: ,(:macro (meta #'and))

16:20 clojurebot: true

16:21 dnolen: *** You have joined channel #clojure [15:55]

16:21 *** Topic for #clojure: Clojure, the Lisp that makes the JVM dynamic. See

16:21 http://clojure.org or video at http://clojure.blip.tv .

16:21 *** #clojure: topic set by jcowan, 17:18:57 2008/03/07

16:21 *** Users on #clojure: dnolen rfgpfeiffer fedito dnolen-rec dabd` mccraig

16:21 mudphone mikehinchey LeNsTR slyrus grosours jcromartie dysinger

16:21 perspectival ynniv jkkramer krumholt__ ior3k Raz_ dsop heow choas somnium

16:21 mrsolo hipertracker Hali_303 caljunior Kyrus duncanm opqdonut boyd replaca

16:21 defn: uh oh'

16:21 dnolen: Ash rdd dnm_ jasapp_ spariev_ the-kenny Guest19765 Hun ghotli ntoll

16:21 cemerick: ah crap, not this again

16:21 dnolen: lghtng_away _mst kjalarr hiredman mariorz gregh rsynnott Leonidas shachaf

16:21 erg morty rys aking rowth hobbsc lisppaste8

16:21 defn: this could be very bad

16:21 dnolen: *** Users on #clojure: headlessClown cpfr AWizzArd murbank mrSpec fmu jjames

16:21 cemerick: dnolen: dude, you've been owned

16:21 dnolen: shmichael jpulakka tomaw__ webben hoeck durka42 Strika rberger cburroughs

16:21 wtetzner Raynes mtm Modius corruptmemory lopex walters probablyCorey hone_

16:21 Knekk_ seangrove jbomo hipertracker-off danlarkin Chousuke therealadam

16:21 morphling DeusExPikachu mabes dbx triddell romanb LauJensen StartsWithK

16:21 jcromartie: what the heck is that

16:21 dnolen: enebo stuartsierra wilig wlr Bjering_ froog_ st_ onion_ liebke ivan

16:21 defn: methinks someone doesn't know how to use emacs

16:21 jcromartie: I don't like it

16:21 dnolen: ivan_chernetsky fogus G0SUB

16:21 *** Users on #clojure: jamie_alm jweiss jfkw_ cemerick blubber-- shrughes

16:21 geramuk l_a_m technomancy|away cgrand OlegYch|h__ fractalis dalkvist defn

16:21 janm zakwilson scottj ndimiduk Licenser pavelludiq lhitchon mrmargolis pdk

16:21 tomoj npm hyp3rvigi1ant andreaja polypus eno sattvik esj datka hdurer

16:21 hiredman: no ops here (ever) either

16:21 dnolen: xandrews Holcxjo KarlThePagan2 Fingerzam Luyt Draggor redinger ttmrichter

16:22 dmiller2718 fivebats chouser j0ni arbscht ambroff jonafan smyge thickey

16:22 angerman jedediah bobo_ skeptomai|away

16:22 *** Users on #clojure: scode frodwith jarpiain rotty turbo24prg lenbust

16:22 syntaxman strlen dthomas peddie broquaint ocher noidi Apage43 dmiles_afk

16:22 jcromartie: who can kick him?

16:22 dnolen: bitbckt metric cp2 shr3kst3r drewr nareshov marten shawn_ nuba Aisling

16:22 jonafan: wat

16:22 jcromartie: anybody?

16:22 hiredman: no one

16:22 dnolen: raek yason danm__ Drakeson clojurebot piccolino abrooks brixen srcerer

16:22 jcromartie: fun

16:22 dnolen: ts00000 gbj`` albino hchbaw bhall unfo- cypher23 haptiK TheBusby felipe`

16:22 clows gravity mtd joewilliams codemonkeyx mfoemmel _alex _BLINDWHITECRABS

16:22 technomancy: there's always /ignore, fellas

16:22 defn: sigh

16:22 dnolen: fgtech Intensity leafw s450r1 eivindu

16:22 *** Users on #clojure: mikem nullman` sjbach @ChanServ

16:22 nuba: wth?

16:22 dnolen: <dsop> hiredman: yes this is it

16:22 *** #clojure modes: +tncR

16:22 *** #clojure was created on Tuesday 2007/12/11 17:04:26

16:22 defn: he's almost done

16:22 dnolen: <dsop> cemerick: I'm not saying it's perfec,t but it works for java and scala

16:22 stuff so far

16:22 <cemerick> dsop: then, in general, you've got a bug or design flaw in how

16:22 you're integrating with your parent (jetty's) classloader [15:56]

16:22 defn: nevermind

16:22 dnolen: *** seangrove (n=user@c-67-188-3-10.hsd1.ca.comcast.net) has quit: Remote

16:22 closed the connection

16:22 *** seangrove (n=user@c-67-188-3-10.hsd1.ca.comcast.net) has joined channel

16:23 Draggor: copy paste fail?

16:23 dnolen: #clojure [15:57]

16:23 *** kotarak (n=mb@ip-81-210-163-176.unitymediagroup.de) has joined channel

16:23 #clojure [15:58]

16:23 *** technomancy (n=user@71-23-19-98.war.clearwire-wmx.net) has joined channel

16:23 #clojure

16:23 *** dabd` (n=user@wifi.ist.utl.pt) has quit: Read error: 113 (No route to

16:23 host) [16:02]

16:23 *** nathanmarz (n=marz@204.14.159.167) has joined channel #clojure [16:03]

16:23 *** ikaros (n=ikaros@f051195105.adsl.alicedsl.de) has joined channel #clojure

16:23 defn: dnolen: you're ignored. sorry dude, but if you accidentally copy/pasted, you need to just quit your client so we don't have to read this garbage

16:23 dnolen: [16:04]

16:23 *** _bob (n=bgr@dc5146e16c.adsl.wanadoo.nl) has joined channel #clojure [16:06]

16:23

16:23 defn: anywho -- what's up all?

16:23 datka: You can only sit back in abject horror as you're powerless to stop yourself

16:23 LeNsTR: dnolen: u'r idiot -_-

16:23 defn: datka: lol

16:23 ivan: no, you can close the connection

16:24 somnium: M-x butterfly gone horribly wrong?

16:24 kotarak: LeNsTR: watch your language.

16:24 LeNsTR: sorry

16:24 defn: wtf is butterfly?

16:24 Draggor: kill -9 is a beutiful thing

16:24 defn: I just see "Amazing physics going on..."

16:25 the-kenny: M-x butterfly is a parody to xkcd :)

16:25 kotarak: defn: http://xkcd.com/378/

16:25 datka: That comic always bothered me because you wouldn't have a shortcut like that

16:26 Draggor: I should give vimclojure a shot again, unless there's something better

16:26 * the-kenny prefers a needle and a steady hand

16:26 kotarak: Draggor: what is the problem with vimclojure?

16:26 defn: kotarak: :D

16:26 Draggor: it's called Emacs

16:26 ;)

16:26 Draggor: defn: I like my pinky finger too much to use emacs ;)

16:27 kotarak: Draggor: take your chance to tell the author how to imrpove it.

16:27 defn: Draggor: just make caps lock your control key and use your ring, sweet heart :)

16:27 Draggor: kotarak: Last time I attempted I just never got it working, though at the time my install was.. borked, so I should try again.

16:27 defn: Ultimately, I am way too attached to my different modes (visual/command/edit/etc)

16:28 kotarak: Draggor: let me know, when you have a specific problem.

16:28 Draggor: defn: And no mod in emacs ever worked to my satisfaction

16:28 defn: nod -- it's okay, i just recommend emacs to people using clojure

16:28 paredit + clojure mode + swank === win

16:28 Draggor: defn: I used it when I was at a lisp programming job for about a year, so I got ot know emacs well

16:29 defn: okay before this gets any further -- let's stop the editor wars

16:29 ive had this discussion in here like 30-40 times i think so far heh

16:29 StartsWithK: kotarak, ant build.xml plz :)

16:34 defn: i do not "get" enlive at all

16:35 kotarak: StartsWithK: hmmm... not sure

16:36 cemerick: defn: let me know if you have any Q's. I'm no expert, but I'm enjoying enlive a *lot*.

16:36 defn: cemerick: ill have a couple in a minute here, im just getting the skeleton of this project to stand up

16:37 Draggor: kotarak: if I want to use compojure, do I swap the clojure.jar with the compojure.jar?

16:37 defn: and then i have a question im sure you can help me with that has been baffling me :\

16:37 jcromartie: mmmm enlive

16:37 * jcromartie waves his arms

16:37 jcromartie: I'm using compojure too

16:37 cemerick: yeah, I was going to say...

16:37 kotarak: Draggor: dunno. Does compojure include clojure? Otherwise you need both.

16:37 cemerick: defn: there's a #compojure channel over there ---->

16:38 no, compojure is just another clojure lib

16:39 Draggor: enlive looks purdy

16:39 defn: i dont understand how to get from tagsoup-ified output to actual HTML

16:39 kotarak: defn: with deftemplate

16:40 defn: that's weird to me -- why do i need a template if i dont want to transform the tagsoup at all

16:40 im just trying to scrape a website, i dont care to transform it in the slightest

16:40 cemerick: defn: then just use html-resource and select

16:41 defn: have you seen http://wiki.github.com/cgrand/enlive/ ?

16:41 kotarak: Draggor: what does purdy mean?

16:42 jcromartie: enlive_html.clj

16:42 it holds all of the secrets

16:42 deftemplate is a very simple macro

16:42 it's built on the template macro

16:42 Draggor: kotarak: usefull and the code looks nice (poor internet spelling of pretty)

16:43 I think it's also a southern united states pronunciation of pretty as well.

16:43 jcromartie: it's a hillbilly/low-class accent

16:43 defn: you want emit*

16:46 defn: jcromartie: emit* gives me the "</" "a" ">" type output

16:47 should i just apply str

16:47 jcromartie: yes

16:47 defn: ahhhh, here we go

16:47 thanks jcromartie

16:48 im building a scraper for the #clojure html irc logs

16:48 jcromartie: can you get the raw logs?

16:48 because that would be much easier

16:48 defn: you're telling me :)

16:49 i dont believe there are raw logs but maybe...

16:50 what i was really interested in is making a sort of extension of contrib.repl-utils

16:50 hiredman: my #clojure.log is 49 megs, but the formating is atrocious

16:50 defn: that would let you peek at mentions in irc of keywords etc.

16:51 hiredman: it changes through out the file to, as I switch irssi themes

16:51 defn: nod

16:51 my logs are terrible as well

16:51 and far from complete

16:54 how would i removed an <a....> node with enlive

16:55 cemerick: defn: transform with [:a] (substitute nil) IIRC

17:01 defn: cemerick: could you give me an example?

17:02 I see what you're saying but I'm not sure how to write it: (transform page-of-nodes (substitute [:a] nil))

17:02 something like that?

17:02 i get nth not supported on this type

17:03 cemerick: defn: I've only ever used transformations in the context of deftemplate, so I'm not clear on the exact fns that you need to use for 'bare' replacement. But, this *might* help http://groups.google.com/group/enlive-clj/browse_frm/thread/b309171ebcc253b5

17:10 cgrand: cemerick: nil is shorthand for (substitute nil) so you can do [:a] (when-let [url (:url data)] (set-attr :href url)) for example

17:16 defn: (flatmap (transformation [:a] nil) nodes)

17:17 defn: cgrand: cool, exactr

17:17 exactly what i was looking for

17:17 thanks

17:18 dnolen: *** You have joined channel #clojure [15:55]

17:18 *** Topic for #clojure: Clojure, the Lisp that makes the JVM dynamic. See

17:18 http://clojure.org or video at http://clojure.blip.tv .

17:18 *** #clojure: topic set by jcowan, 17:18:57 2008/03/07

17:18 *** Users on #clojure: dnolen rfgpfeiffer fedito dnolen-rec dabd` mccraig

17:18 mudphone mikehinchey LeNsTR slyrus grosours jcromartie dysinger

17:18 perspectival ynniv jkkramer krumholt__ ior3k Raz_ dsop heow choas somnium

17:18 mrsolo hipertracker Hali_303 caljunior Kyrus duncanm opqdonut boyd replaca

17:18 Ash rdd dnm_ jasapp_ spariev_ the-kenny Guest19765 Hun ghotli ntoll

17:18 LeNsTR: oh

17:18 dnolen: lghtng_away _mst kjalarr hiredman mariorz gregh rsynnott Leonidas shachaf

17:18 erg morty rys aking rowth hobbsc lisppaste8

17:18 *** Users on #clojure: headlessClown cpfr AWizzArd murbank mrSpec fmu jjames

17:18 shmichael jpulakka tomaw__ webben hoeck durka42 Strika rberger cburroughs

17:18 wtetzner Raynes mtm Modius corruptmemory lopex walters probablyCorey hone_

17:18 Knekk_ seangrove jbomo hipertracker-off danlarkin Chousuke therealadam

17:18 morphling DeusExPikachu mabes dbx triddell romanb LauJensen StartsWithK

17:18 enebo stuartsierra wilig wlr Bjering_ froog_ st_ onion_ liebke ivan

17:18 ivan_chernetsky fogus G0SUB

17:18 *** Users on #clojure: jamie_alm jweiss jfkw_ cemerick blubber-- shrughes

17:18 geramuk l_a_m technomancy|away cgrand OlegYch|h__ fractalis dalkvist defn

17:18 janm zakwilson scottj ndimiduk Licenser pavelludiq lhitchon mrmargolis pdk

17:18 tomoj npm hyp3rvigi1ant andreaja polypus eno sattvik esj datka hdurer

17:18 xandrews Holcxjo KarlThePagan2 Fingerzam Luyt Draggor redinger ttmrichter

17:19 dmiller2718 fivebats chouser j0ni arbscht ambroff jonafan smyge thickey

17:19 angerman jedediah bobo_ skeptomai|away

17:19 *** Users on #clojure: scode frodwith jarpiain rotty turbo24prg lenbust

17:19 jonafan: FUCK YOU.

17:19 dnolen: syntaxman strlen dthomas peddie broquaint ocher noidi Apage43 dmiles_afk

17:19 bitbckt metric cp2 shr3kst3r drewr nareshov marten shawn_ nuba Aisling

17:19 Draggor: and the fail begins again

17:19 cpfr: oh come on

17:19 dnolen: raek yason danm__ Drakeson clojurebot piccolino abrooks brixen srcerer

17:19 ts00000 gbj`` albino hchbaw bhall unfo- cypher23 haptiK TheBusby felipe`

17:19 clows gravity mtd joewilliams codemonkeyx mfoemmel _alex _BLINDWHITECRABS

17:19 LeNsTR: need bot

17:19 hipertracker: jonafan: use /ignore dnolen

17:19 hiredman: I still have him on ignore

17:19 defn: same here

17:19 * chouser adds

17:19 Raynes: What the hell?

17:19 O_o

17:19 hipertracker: fucking bot

17:20 chouser: please watch your language, guys.

17:20 likely an honest mistake

17:20 hiredman: he's not a bot

17:20 scode: Probably just an accidental cut'n'paste.

17:20 Hun: twice?

17:22 dnolen_: wowzers apologies

17:22 emacs erc foobar

17:22 defn: dnolen_: i will unignore

17:22 dnolen_: thx

17:24 jonafan: sorry, my circuits overloaded and i dropped an fbomb exception

17:25 defn: dnolen_: just FWIW, if you accidentally do that, just close your client -- on your end it looks like you pasted the whole thing, but on our ends it slowly scrolls one line..waits a second or two, posts the next line, etc.

17:25 if you just cut your client you'll avoid (some of) the rage

17:26 dnolen_: defn: yeah, I didn't realize what was going initially, and thought I'd closed the client but hadn't really

17:26 defn: nod -- no worries

17:27 chouser: in the end, not as bad as most editor discussions.

17:27 kotarak: :)

17:27 defn: lol chouser

17:28 the-kenny: chouser: You're right

17:28 chouser: if for no other reason than that I have a hard time ignoring editor discussions. :-/

17:48 krumholt: did somebody just say "editor discussion"? :)

17:48 dnolen: funny enough that whole fiasco was caused by my newb handling of emacs the OS :)

17:50 Draggor: b'dum tish

17:53 * Draggor hates coding in java

17:57 zakwilson: So I need to write a custom smtp server. It's nothing too special; it just needs to have some hooks in to the mail delivery process. Any suggestions for libraries that do most of the work for me?

18:02 mabes: for some reason I can't get a request body from compojure: http://gist.github.com/286367 Any ideas on what I am doing wrong?

18:04 hiredman: don't you have to do -X PUT for curl?

18:08 mabes: hiredman: yeah, it looks like the data is coming across as form-params otherwise.. so the problem must be the curl command. I misunderstood the --data flag in the man pages.. Rereading the man page now..

18:23 erikprice: How do I put a call to recur in the tail position if I only want the recursion to happen under certain conditions? Making my (recur) call one of the expressions of an (if) is invalid.

18:23 (Sorry if that message is a repeat; I wasn't registered with the nickserv the first time.)

18:24 joshcheek: Hi, wanting to use Clojure for my AI course, but I can't figure out how to have it evaluate a file, all the instructions I've seen deal with the REPL. Can anyone link me to instructions for setting it up so I can just type "cloj my_file.clj" and have it execute?

18:24 dnolen: erikprice: making recur a position in if is not necessarily the problem.

18:25 erikprice: ah. In my case, I'm attempting to call recur in an 'if' at the end of an anonymous function. Is this incorrect usage of recur?

18:25 hiredman: ~dead simple setup

18:25 clojurebot: simple setup is http://www.thelastcitadel.com/dirt-simple-clojure

18:25 hiredman: the last line there

18:25 if you tack the filename on the end of it, it will do what you want

18:25 dnolen: erikprice: can you paste the code?

18:25 joshcheek: thank you, hiredman and bot

18:25 erikprice: sure which pastebin do we use here

18:25 hiredman: erikprice: a function can have more that one tail

18:26 each branch of an if is a tail

18:26 dnolen: doesn't matter really I like gist but people here tend to use http://paste.lisp.org/

18:27 hiredman: lisppaste8: url?

18:27 erikprice: http://paste.lisp.org/+20GO

18:28 hiredman: that recur is not in the tail position

18:28 I don't see what you are trying to do

18:29 at all

18:29 erikprice: that is wrong

18:29 apparently I made a typo.

18:30 hiredman: you have a function, that when called creates a function, and calls that function immediatly, which returns []

18:30 that is not going into the issue with recur

18:30 erikprice: after fixing my typo, I no longer get the compiler error about misusing recur - the function compiles. Pardon my boneheadedness.

18:30 hiredman: easier just to do (defn sift [s] [])

18:31 erikprice: This is the fixed version, FWIW: http://paste.lisp.org/+20GO/1

18:31 s/fixed version/version without typos/

18:32 hiredman: is there a reason you use a fn like that instead of using loop/recur or reduce?

18:32 defn: I can remove all 'a' tags by doing (flatmap (transformation [:a] nil) my-resource)

18:32 how would I remove all <a name...> tags?

18:33 [:a {:name #"*"}]?

18:33 erikprice: @hiredman I tried using a reduce but I wasn't clever enough to figure out how to do it that way. I'm working on this exercise: http://fulldisclojure.blogspot.com/2010/01/code-kata-data-sifter.html

18:34 My implementation doesn't work yet but at least I'm not getting the compiler error anymore. I'll have to revisit it.

18:34 Thanks again.

18:37 hiredman: reduce can do fairly abitrarily complex things

18:37 ar

18:38 you would need use a vector and call seq or apply list at the end

18:39 "After that, add the ability to take a vector/array as an input" is kind of ridiculous

18:40 I mean, it's all seqable, so making it a big deal is dumb

18:40 defn: anyone know how to refer (in enlive) to <a name=...>? like [:a {:name}] seems like it would work but doesn't

18:40 hiredman: reduce will, out of the box, work on all of those types

18:40 defn: well the reader would barf on that anyway

18:40 defn: yeah arrindexoutofbounds

18:41 hiredman: I would try {:name nil} but I don't know anything about enlive

18:41 defn: good idea

18:41 dnolen: defn : http://enlive.cgrand.net/syntax.html

18:41 defn: dnolen: thanks

18:44 bah i still cannot figure this out -- what is wrong with me today

18:45 (flatmap (transformation [:a] nil) my-tag-soup) works

18:45 the tag-soup data looks like: ({:tag :p, :attrs nil, :content [{:tag :a, :attrs {:name "20:46"}, :content ["20:46"]}...

18:45 hiredman: sure

18:46 that is how clojure.xml represents xml

18:46 defn: so what is [:a], really? {:tag :a}?

18:46 hiredman: what?

18:46 clojurebot: what is wrong with you

18:46 dnolen: defn: are you using enlive or no?

18:46 hiredman: clojurebot: thanks!

18:46 clojurebot: I don't understand.

18:46 defn: dnolen: correct

18:47 hiredman: earlier I used transformation [:a] -- how does enlive see that? as {:tag :a}, no?

18:47 dnolen: defn: what is transformation? that's not an enlive function. something of your own?

18:48 defn: it is an enlive macro

18:48 net.cgrand.enlive-html/transformation

18:48 ([] [form] [form & forms])

18:49 dnolen: defn: are you just trying to select some node are you trying to create some kind of custom transformation for your own use?

18:49 defn: i select some nodes.. I select [:div#main :p]

18:50 the nodes it gives me back contain <a hrefs> and <a names>

18:50 i want to remove all of the <a name> stuff

18:51 dnolen: defn: enlive has 'but'

18:51 it's not a real css selector but it let's exclude nodes

18:52 defn: dnolen: the question still stands though -- how do i represent <a name>

18:54 dnolen: defn: looking to see if I have an example.

18:56 [:a (attr? :name)]

18:56 i think

18:56 there's also the enlive ML if that doesn't work

18:57 defn: dnolen: I tried that earlier I think and didn't have any luck, but let me try again

18:58 yeah it doesn't match

18:58 dnolen: what is the whole selector you are trying to use?

18:59 defn: (flatmap (transformation [:a (attr? :name)] nil) (select resource [:div#main :p]))

18:59 that's the whole thing

19:02 dnolen: defn: did you try (select resource [:div#main :p (but [:a (attr? name)])]) ?

19:02 alexyk: so, with transient, if I declare one outside a loop as (let [res (transient {})] ... (loop ... (assoc! res x y)), I don't need to reassign (let [res (assoc! res ...)] ...) anymore, assoc! works on the existing, dirty, mutable, in-scope res, right?

19:03 dnolen: defn: oh I see

19:03 defn: you want all children of those paragraphs just no links with names?

19:04 defn: yes

19:04 dnolen: more like this then, [:div#main :p :* (but [:a (attr? name)])]

19:04 defn: heh, the first version got me closer

19:04 dnolen: oops cause of typo

19:04 more like this then, [:div#main :p :* (but [:a (attr? :name)])]

19:05 :name instead of name

19:05 defn: yeah i had that

19:05 hmmmmmm

19:06 well this worked, but it's definitely not pretty:

19:07 (flatmap (transformation [:* (attr? :name)] nil) my-resource)

19:08 so maybe im picking the wrong selector before?

19:08 dnolen: is :* the same as [:x [:y [:z]]] or just [:x]

19:09 if i wanted to get to :z would I do [:* :*]

19:15 dnolen: duh -- my fault -- i figured it out, i wanted to do (transformation [:p [:a (attr? :name)]] nil)

19:18 alexyk: the transient indeed works as described, dirty mutable thing

19:26 hmm, freenode is pulsating again

19:32 joshcheek: Hi, trying to install Clojure. I followed http://www.thelastcitadel.com/dirt-simple-clojure but it doesn't seem to work http://grab.by/1Yca

19:41 chouser: joshcheek: probably shouldn't have both clojure.jar and clojure-1.1.0.jar

19:42 joshcheek: also might need to: export CLASSPATH

19:43 joshcheek: chouser: It loads the REPL now, thank you.

19:44 chouser: great! you're quite welcome.

19:45 joshcheek: chouser: I created a file "hello_world.clj" which houses the text '( println "hello world" )' What do I need to do to get Clojure to read this file?

19:46 (and print "Hello world")

19:46 chouser: try: java clojure.main -i hello_world.clj

19:47 joshcheek: chouser: Thank you, I'll quit bugging you now :)

19:48 chouser: not at all

19:49 if you feel very deeply grateful, consider picking up the book: http://joyofclojure.com

19:49 :-)

19:51 defn: chouser: any ETA on the next chapter or two?

19:52 chouser: defn: I don't think I can say anything useful except we're working on it

19:54 defn: chouser: cool cool, just thought id bug you about it :)

19:55 chouser: oh, I guess I can say that next up you can expect a re-working of the chapters already available, and then after that a chapter on composite types (the collections)

19:59 but all that has at least one round of editing before it goes on the MEAP

19:59 joshcheek: chouser: I didn't realize manning had a book for clojure, when I search Amazon, the only ones I've seen are the pragprog one (the one I picked up, which did not discuss how to do this), and one by apress, which also isn't out yet. Manning has a high standard of quality (in my experience with Ruby, at least), seems like it should be on that list :/

19:59 chouser: and I have no sense yet of how long that'll take.

20:00 joshcheek: Manning has two Clojure books on the way. I don't know why they're not on amazon yet.

20:02 joshcheek: chouser: I'll keep my eye open for it.

20:12 alexyk: I've finally found a way to sweep through my mongo graph very quickly with a transient, just at top level. Alas, it returns only a map with 8 keys, instead of 3 million. Why? Any transient quirks? Here's the fun: http://paste.pocoo.org/show/170077/

20:14 it dutifully updates the nested map, non-transient one, for those first 8 keys -- the first in mongo stream. It walks all 37 million triples... And returns a puny res.

20:14 hiredman: alexyk: most likely you are bashing a transient in place

20:15 I seem to recall the number 8 popuping in those cases

20:15 alexyk: hiredman: I do. Should I lay it comfortably on a sofa?

20:15 hiredman: no, you should use it just like you do the persitant version

20:15 alexyk: hiredman: you mean I still need to reassign it?

20:15 hiredman: it's not assignment!

20:15 alexyk: I've asked above and no one gave a damn

20:15 hiredman: did you read the page ontransients?

20:16 alexyk: so -- (let [res (assoc! res ...)] ...) ?

20:16 hiredman: http://clojure.org/transients

20:16 read

20:17 alexyk: quick hack fiorst, read second

20:18 hiredman: it's not that much to read

20:18 alexyk: seems like adding res to recur will do

20:18 did read it, just one example

20:20 hmm

20:20 hiredman: possibly, I don't recall your code, but the key point is: design your algorithm for a persitant structure. if you need speed and it is threadsafe, you stick calls to transient and persistent in key places and suddenly it works for transients

20:25 alexyk: yep

20:25 has to rebind it as persistent... example from TFurl works. Number 8 should go to FAQ or something.

20:30 hiredman: no

20:31 alexyk: hiredman: why not? thank you for catching it btw

20:31 hiredman: you don't call persistent until you are all done

20:34 alexyk: with the principled approach, yes

21:19 jasapp: is there a good introduction to protocols somewhere?

21:26 Raynes: Why doesn't (clojure.contrib.repl-utils/source doc) work anymore?

21:27 jasapp: http://www.assembla.com/wiki/show/clojure/Protocols Pretty much covers it.

21:27 chouser: works for me. Are you sure you have core.clj on your classpath (not just the compiled .class files)

21:29 jasapp: Raynes: cool, thanks

21:37 Raynes: chouser: I have the clojure and clojure-contrib jars that leiningen downloaded on my classpath.

21:37 chouser: I can (use ..) repl-utils but I cannot directly call a function from it without (use ..)ing it.

22:01 quizme: can somebody give me an example of how to use dochars ?

22:03 i'm trying to iterate on each character of a string

22:03 alexyk: I see working code like: (-> cursor .next .toClojure) -- can I omit parens if it's a single name? what's the rule?

22:07 Raynes: ,(doc ->)

22:07 clojurebot: "([x] [x form] [x form & more]); Threads the expr through the forms. Inserts x as the second item in the first form, making a list of it if it is not a list already. If there are more forms, inserts the first form as the second item in second form, etc."

22:07 Raynes: Inserts x as the second item in the first form, making a list of it if it is not a list already...

22:11 ztellman: a number of examples programs in Penumbra work under 1.1.0-new, and don't work under 1.2.0-master

22:12 I'm willing to believe I was misusing something, but can someone give me any hints as to the differences between the two branches?

22:12 specifically that might have to do with clojure.walk or applying metadata to vars?

22:16 chouser: huh. 1.2 is mostly backward compatible.

22:16 ztellman: can you point to a specific example?

22:16 ztellman: chouser: yes, but there's a lot of underlying code

22:16 chouser: hm.

22:16 ztellman: this relates specifically to the translation from s-exprs to GLSL shader code

22:16 chouser: maybe the stack trace?

22:16 ztellman: the stack trace just says that it can't infer the type of a particular variable

22:17 in 1.1.0-new, it can; in 1.2.0-master, it can't

22:17 the type is attached via metadata, which is why I think maybe that's the culprit

22:18 alexyk: Raynes: indeed, thx

22:20 chouser: ztellman: what's the specific error?

22:21 ztellman: chouser: I walk the tree, and the type inferences, and then check to see that every variable has a type

22:21 in 1.2.0-master, it doesn't, and I throw an exception

22:21 so it's not an exception from Clojure, if that's what you're angling for

22:40 ok, I've figured out the difference

22:41 in 1.2.0-master, (meta (second '(a #^b c))) returns nil

22:41 in 1.1.0-new, it returns {:tag b}

22:42 is this a bug, or just backwards incompatibility?

22:42 dnolen: backward incompat i think

22:42 ^ is deprecated

22:42 you should use meta

22:42 ztellman: dnolen: ^ to get meta, but to assign meta isn't #^ still the way to go?

22:43 dnolen: hmm, yeah, dunno about that.

22:43 ztellman: is there a new tag reader macro?

22:43 I know a^int is the way forward, once ^ is no longer a reader macro for meta

22:43 but I didn't think we were there yet

22:43 chouser: ztellman: it may be a bug

22:44 ztellman: chouser: is there anything else I can do to help with this, or can you take it from here?

22:44 chouser: ztellman: it'd probably be best to post a description to the google group.

22:44 ztellman: ok, will do

22:44 thanks

22:45 chouser: I may have some time to look at it, but Rich can probably glance at it and have it fixed 10 minutes later.

22:45 ztellman: just to be clear, the dev group?

22:45 chouser: if you're on the dev group, sure. But either is fine.

22:46 (meta '#^b c)

22:46 looks like it may be all symbol metadata

22:46 oh. wait, nm.

22:51 tolstoy: When you override a method using proxy, is there a way to call the superclass' version of that method? proxy-super is for calling other methods, right?

22:51 Something like in Java: public void doSomething() { super.doSomething(); myStuff(); }

22:52 chouser: proxy-super can be used to call the same-named method too

22:52 beware it is not thread-safe.

22:53 tolstoy: Hm. I get some sort of error when I do that. Let me see if I can trap it.

22:53 (proxy [Something] [] (doSomething [] (proxy-super doSomething) (other-func)))

22:53 that should work?

22:54 chouser: I think so

22:55 tolstoy: Yeah, it's what I'd expect from the docs.

22:58 java.lang.UnsupportedOperationException

22:58 Hm.

22:58 chouser: that usually means the underlying method has no implementation.

22:59 defn: what are all the different types enumerated by metadata?

22:59 like (:macro (meta #'and)) => true

22:59 what other types of metadata like :macro exist?

23:00 chouser: it's an open set. you can add your own!

23:01 defn: sure i know, i guess i just mean does clojure.core have any others which describe what it is like :macro

23:01 chouser: I don't know of a complete list, but there aren't actually very many

23:01 :arglists, :tag, :doc ...

23:01 defn: sure, specifically im asking about other identifiers which are very closely related to :macro

23:01 im not sure what to call that sort of identifier

23:02 chouser: the compiler needs that so it knows that a var is actually a macro, so deftype sets it.

23:03 defn: ah-ha!

23:03 ,(doc deftype)

23:03 clojurebot: "clojure.contrib.types/deftype;[[type-tag constructor-name docstring? attr-map?] [type-tag constructor-name docstring? attr-map? constructor] [type-tag constructor-name docstring? attr-map? constructor deconstructor]]; Define a data type by a type tag (a namespace-qualified keyword) and a symbol naming the constructor function. Optionally, a constructor and a deconstructor function can be given as well, the defaults being

23:04 defn: why is it in contrib if this happens in core?

23:04 chouser: deftype was in contrib first, but meant something else.

23:04 defn: ah, for some reason i dont have deftype in my core

23:04 maybe i have an old version of clojure?

23:05 chouser: defn: deftype is new in the master branch post 1.1

23:05 defn: chouser: thanks

23:05 chouser: 1.2.0-master-SNAPSHOT

23:05 defn: many thanks

23:05 chouser: np

23:05 tolstoy: Ah, I made an interface which looks like a class I usually subclass. So, UnsupportedError.

23:06 wlr: chouser,ztellman: for me [*clojure-version* (meta (second '(a #^b c)))] => [{:interim true, :major 1, :minor 2, :incremental 0, :qualifier "master"} {:tag b}]

23:07 chouser: wlr: thanks. The change that apparently broke it was 430dd4fa711d0008137d7a82d4b4cd27b6e2d6d1 Tue Jan 19

23:10 wlr: ah. ok.

23:27 alexyk: somnium: ping

23:28 how do you convert a sorted-map back to a regular one?

23:29 defn: is there a way to go back?

23:29 chouser: (into {} a-map)

23:29 defn: oh duh

23:30 alexyk: ok

23:38 defn: (defn clojure-conversation [container]

23:38 (doseq [k conversation]

23:38 (conj container (text k))))

23:38 chouser: nooo

23:38 defn: :)

23:38 chouser: is that some kind of sick joke?

23:38 :-P

23:38 defn: unfortunately no

23:39 chouser: you can never ignore the return value of 'conj'

23:39 defn: could you explain what you mean? the implications?

23:39 chouser: hm, not quite. More like: any code that ignores the return value of 'conj' is useless.

23:39 conj doesn't change anything. it creates a new collection instance and returns it

23:40 defn: oh wait i think i see

23:40 when you conj onto something it return it, but our function will never know about the return from conj

23:40 yes?

23:40 returns*

23:41 chouser: right, conj does nothing except return a new value. doseq ignores everything returned by the expressions in its body and simply returns nil itself

23:41 thus your clojure-conversation will walk through 'conversation', heat up your processor, and return nil

23:41 defn: so i want a loop/recur

23:42 chouser: (into container (map text conversation))

23:42 * defn buries his head in shame

23:43 chouser: or loop/recur if you prefer more lines of code.

23:43 hiredman: you most likely want reduce

23:56 defn: thanks

Logging service provided by n01se.net