#clojure – 2009-06-13

2009-06-13

01:04	bradford	what is the best way to do a with-open file and go through a for comprehension doing a write-line ot the file for each member of a sequence?
01:27	slashus2	bradford: Probably want to use doseq for side-effects.
03:30	slashus2	I was playing around with sending objects over sockets, and it won't let me send a clojure.lang.Keyword because it doesn't implement Serializable.
03:34	slashus2	I was trying to send a hash map, but using :keywords in the map didn't allow this to happen. Works fine without them.
03:38	slashus2	Just adding Serializable to the list of things it implements in Keyword.java seemed to work. Is there a reason that a keyword isn't serializable?
03:40	cark	why not print then read ?
03:41	slashus2	cark: I was trying to use writeObject over a socket.
03:43	cark	right, what i mean is that you don't have to go the java way
03:44	cark	it's pretty usual in the lisp world to just print readably, then rebuild your objects with read-string
03:44	slashus2	So I just make the data structure into a string and then read it back?
03:44	cark	right
03:44	cark	,(prn :bleh)
03:44	clojurebot	:bleh
03:44	cark	(read-string ":bleh")
03:45	slashus2	I was doing this because I was going to eventually send over image data.
03:45	kotarak	beware of references....
03:45	cark	and cycles =)
03:46	cark	though references should be top level
03:46	cark	and cycles couldn't exist without references
11:35	drewr	Why does (future (Thread/sleep 1000) :foo) block?
11:36	drewr	I thought that should return the Future object directly and only block with a deref.
11:40	lisppaste8	drewr pasted "future behavior confusion" at http://paste.lisp.org/display/81814
11:41	rhickey	drewr: getting deref'ed to print
11:41	rhickey	fixed in latest
11:42	rhickey	http://github.com/richhickey/clojure/tree/master
11:42	drewr	OK, that was from 1.0.0.
11:42	rhickey	hrm - how do people refer to particular revisions in git?
11:42	drewr	Just a shortened commit id.
11:43	rhickey	ugh, hard to intuit the order of those things
11:43	drewr	Like, "that was from 8c2b2b04fed," in my case.
11:43	drewr	Yeah, that's the only downside to DVCS IMO.
11:44	rhickey	the only one, eh?
11:44	rhickey	:)
11:44	drewr	Actually, probably so.
11:52	drewr	This is cool. I think it will replace agents in one codebase I have and manual Executor stuff in another.
11:52	rhickey	drewr: what will, futures or promises?
11:53	drewr	futures
11:54	drewr	One application I have kicks off agents to query a db in parallel, with an await at the end.
11:55	drewr	Latch-like.
11:55	rhickey	drewr: yeah, that use of agent-as-thread is better done with futures
11:59	drewr	Catching up on promise/deliver.. interesting.
12:43	Lomono	would anyone have some time to answer some questions on Reddit?
12:43	Lomono	http://www.reddit.com/r/programming/comments/8s8gv/from_c_on_mono_to_clojure_on_the_jvm/c0a9l98
12:48	blbrown_win	the invokeStaticMethod in lang.Reflector takes an Object array. How do I pass that in clojure. I tried this invokeStaticMethod(c, [ "abc" ])
12:58	Chouser	blbrown_win: (to-array ["abc"])
12:58	Chouser	,(to-array ["abc"])
12:58	clojurebot	#<Object[] [Ljava.lang.Object;@160b5e>
13:02	blbrown_win	Chouser you are the man, are you a bot?
13:03	blbrown_win	,Chouser (+ 1 1)
13:03	clojurebot	java.lang.Exception: Unable to resolve symbol: Chouser in this context
13:08	Chouser	Not only am I not a bot, I'm not even here.
13:09	Chouser	I should go mow
14:26	lisppaste8	Anniepoo pasted "forward reference" at http://paste.lisp.org/display/81821
14:27	Anniepoo	so how do I handle forward references in Clojure? I've got the common case of a couple functions that call each other in the common lisp-y 'first is special case' situation
14:28	Anniepoo	(FWIW this code is my feeble attempt to translate a form into a structure of swing panels, an early stage towards a Clojure editor in Clojure)
14:30	lisppaste8	Anniepoo annotated #81821 "untitled" at http://paste.lisp.org/display/81821#1
14:30	Anniepoo	but it's complaining about the forward ref of FirstFormBrowser from FormBrowser
14:33	Anniepoo	foo, no response
14:39	hoeck	Anniepoo: you can just use (def my-name) or (declare my-name)
14:41	Anniepoo	thanks, the defn will overwrite the old value?
14:41	hoeck	yes
14:44	Anniepoo	feels like a hack, but I'
14:44	Anniepoo	I'm a happy camper
14:45	hoeck	or use declare, to give a hint about your intention
14:46	Anniepoo	ah, that feels more self documenting 8cD
14:46	hoeck	declare just expands to a def for each name
17:04	JasonFelice	Any vimclojure users here?
17:04	kotarak	yup
17:04	JasonFelice	Why do I get a three second lag when I use 'o'?
17:05	kotarak	don't know. No one could explain it to me.
17:05	kotarak	I also don't see where this should come from, since <CR> in insert works normally.
17:06	JasonFelice	It's kind of a showstopper. If I turn off gorilla, I don't get highlighting.
17:07	kotarak	You should get highlighting for core.
17:07	JasonFelice	what do you mean?
17:08	JasonFelice	vim-core?
17:08	kotarak	clojure.core
17:08	kotarak	With gorilla you get dynamic highlighting based on the required/used namespaces.
17:08	kotarak	Without Gorilla you get static highlighting for clojure.core
17:11	JasonFelice	I guess I am getting highlighting, just not recognizing any keywords. Just parens and strings, it looks like.
17:11	kotarak	hmmm...
17:12	kotarak	What are your configuration optionsß
17:12	kotarak	?
17:12	kotarak	For vimclojure I mean.
17:14	JasonFelice	I guess the defaults. All I put in vimrc is the gorilla thing.
17:16	kotarak	try: let clj_highlight_builtins = 1
18:23	JasonFelice	kotarak: you can use normal lisp indenting with the rest of vimclojure with a small edit of the indent file. That solves the "o" problem.
18:24	kotarak	normal lisp indenting is not sufficient due to clojure's specialties like [] or {}.
18:26	kotarak	What I don't understand is, that 'o' has a delay, but the "normal" <CR> does not.
18:26	JasonFelice	Don't know. I actually use ruby for scripting vim, so I don't know how much of the vim guts works.
18:28	kotarak	I used Ruby before Gorilla was merged into VimClojure. It was to instable and the interfacing was quite ugly. So I tried to get back to pure VimScript.
18:29	Anniepoo	hmm.... I take it subclassing a Java class is painful? I'm making a new sort of swing component, actually making it extend JPanel would make my life easier
18:29	JasonFelice	Reall? I have about 500 lines of ruby in my vimrc (for C++) and it works pretty well.
18:30	kotarak	Anniepoo: (ns my.swing.Component (:gen-class :extends javax.swing.JPanel :main false)) should get you started.
18:30	Anniepoo	thanks!
18:31	JasonFelice	kotarak: how do you switch from the repl split? It traps C-w.
18:31	kotarak	Huh? It surely doesn't.
18:32	kotarak	I use C-w + up/down or another C-w. Works for me.
18:34	JasonFelice	Ah, ok... the repl puts you in insert mode.
18:35	kotarak	Yeah. The modes are a bit in the way there...
18:37	JasonFelice	This is a bit of a detour from "let me play with clojure." :)