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05:20 Shvillr: Hello guys. It's me again with my sequence-map multiple values problem. I finally took the time to pay attention to what I'm doing, and uncovered that the problem is only with streams. sequence-map delegates to stream-map, and it uses stream-cons. No prize for guessing how well it works with multiple values. So, I wrote my own function that handles streams just like sequence-map handles sequences,, and then wraps the result in s
05:20 Shvillr: equence->stream. And here is my question: how many different kinds of wrong can you find in it?
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07:58 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/CL-niw
07:58 RacketCommitBot: [racket/master] try to get a little more stack for the intermittent module-lang-test failure - Robby Findler
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08:38 mq_: Hi all, has any body got error when using mysql-connect to connect a remote host?
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11:07 wirew0rm: hey everyone, does anyone know why drracket locks the whole definitions window when opening a read-only file
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11:09 stamourv: As opposed to letting you edit but not save?
11:09 wirew0rm: yes
11:10 stamourv: I assume it's to avoid having people edit and only later realize they shouldn't have done it.
11:10 wirew0rm: as opposed to just greying out save, leaving you with save-as
11:11 stamourv: That would work too. I don't know why the current behavior was chosen.
11:12 stamourv: You may want to bring it up on the mailing list, Robby, the author of DrRacket, reads it, but he's not on IRC.
11:14 wirew0rm: ok i was thinking of creating a github issue but if the mailinglist's the preferred way it'l do to
11:15 stamourv: For bugs, bugs.racket-lang.org is the preferred place to go. But this is more of a design question than a bug, so the mailing list is probably best.
11:16 stamourv: And I don't think we use github issues much. We have our own bug tracker that predates it.
11:18 wirew0rm: yes i already assumed that as there is almost no activity
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12:33 jonrafkind: I want to local-expand an expression past `letrec-values+syntaxes' but i don't want to pass #f because that goes too far. is there a way to do that?
12:40 jonrafkind: hm maybe i can work around it
12:42 mithos28: you want to expand the body of letrec-values+syntaxes or the argument expressions?
12:42 jonrafkind: the body
12:43 jonrafkind: actually (local-expand #'(some-macro foo)) just returns #'(#%app some-macro foo) wtf..
12:43 jonrafkind: isn't it supposed to actually invoke the macro?
12:43 mithos28: pass the empty list as the third argument
12:43 jonrafkind: oh crap i didnt provide some-macro
12:43 mithos28: or non-empty I forget
12:44 jonrafkind: yea '()
12:44 jonrafkind: do you know if I should be using 'expression or 'module or whatever?
12:44 mithos28: for local-expand I think you will have to implement your own internal definition context
12:44 jonrafkind: well in this case I actually dont need an internal definition context
12:45 mithos28: depends on your current context / macro, for the correct contetx
12:45 mithos28: 	
12:45 mithos28: why do you need to expand it then?
12:46 jonrafkind: to force honu parsing
12:46 mithos28: what if the letrec-s+v contains macro definitions?
12:47 jonrafkind: I think I dont actually need let-syntax, #'(force-parse blah ...) works
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12:49 mithos28: ok, good that you found a solution. Racket needs better support for processing internal definition contexts
12:49 jonrafkind: yea that too
12:49 jonrafkind: arg I keep writing (syntax-parse stx () ...)
12:50 mithos28: well isn't it better then having to use syntax-case
12:50 mithos28: even if your hands don't know it yet
12:51 jonrafkind: yea its just annoying to get the 'empty #%app' error
12:52 shofetim: Does anyone have some examples of formlets? http://docs.racket-lang.org/web-server/formlets.html?q=formletts
12:52 shofetim: The docs are nice but some more examples would be handy
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14:13 jonrafkind: hm will (datum->syntax original #'x original) put the #%app from original onto #' x?
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15:52 shofetim: what does (function . => . symbol) mean? its in web-server/formlets the only thing I see about => is that it can be used the same as else in a cond clause...
15:57 jonrafkind: it means (=> function symbol)
15:57 jonrafkind: when you put . x . its infix syntax
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16:14 shofetim: jonrafkind: what does (=> function symbol) mean? I cant find much on =>
16:17 jonrafkind: http://docs.racket-lang.org/web-server/formlets.html?q=%3D%3E&q=contract#(form._((lib._web-server/formlets/dyn-syntax..rkt)._~3d~3e*))
16:17 jonrafkind: I can only find =>*
16:17 jonrafkind: i have no idea what it does
16:19 shofetim: Thanks : ) Neither do I
16:19 shofetim: there is also http://docs.racket-lang.org/reference/if.html?q=%3D%3E&q=%3D%3E&q=contract#(form._((lib._racket/private/letstx-scheme..rkt)._~3d~3e))
16:19 rudybot: http://tinyurl.com/7ytuduz
16:19 shofetim: But that seems to be something else
16:19 jonrafkind: ask on the mailing list
16:20 shofetim: : ) willdo
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16:24 MaxRebo: Hi :) Can someone tell me, why DrRacket would tell me that foldl only accepts 3 arguments? (http://codepad.org/F04eXDEH)
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16:25 stamourv: MaxRebo: Are you in a student language?
16:26 MaxRebo: stamourv: Yes
16:26 stamourv: IIRC, `foldl' is the student languages is restricted to 3 arguments.
16:26 stamourv: Racket's `foldl' is generalized.
16:26 MaxRebo: hm...damn :/ thanks
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16:47 jonrafkind: shofetim, 0 for 2 so far \o/
16:48 Shviller: Hello guys.
16:48 Shviller: rudybot: (sequence-length (sequence-filter (thunk* #f) empty-sequence))
16:48 rudybot: Shviller: your sandbox is ready
16:48 rudybot: Shviller: error: apply: expects type <proper list> as 2nd argument, given: #f; other arguments were: #<procedure:#<undefined>:1:34>
16:48 Shviller: Is it supposed to do that?
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17:16 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/6w8Jzg
17:16 RacketCommitBot: [racket/master] Fixing an error in quoting found by a student this year - Jay McCarthy
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18:00 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/UqM13g
18:00 RacketCommitBot: [racket/master] Fixes define-relation's handling of ellipses across clauses - Robby Findler
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18:25 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/zlahdA
18:25 RacketCommitBot: [racket/master] fix xform problems related to epoll() change - Matthew Flatt
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19:01 masm: I have just updated to Racket 5.2 and I'm getting an error on some use of begin-for-syntax use in a #lang s-exp module.
19:02 masm: I've read the release notes and it mentions some changes in begin-for-syntax.
19:02 jonrafkind: whats the use
19:03 masm: It's just a simple (define-for-syntax (xxx a b) ...).
19:04 jonrafkind: whats the error
19:04 masm: The error I get is "begin-for-syntax: bad syntax in: (begin-for-syntax (define-values ...))
19:04 jonrafkind: paste code
19:11 masm: Paste is here: http://paste.lisp.org/+2P69
19:11 masm: It fails on the first begin-for-syntax.
19:11 jonrafkind: I forget, what does '#lang s-exp' do?
19:11 jonrafkind: maybe your bootstrap-lang.rkt is not providing the right stuff
19:12 masm: It does.
19:12 masm: It's the default parser for racket language, but not binding. Those come from the bootstrap-lang.rkt
19:13 masm: This was working on the previous versions...
19:13 jonrafkind: I mean if you just take out the (define-for-syntax ...) and put it into a new file with #lang racket it works
19:13 jonrafkind: #lang s-exp racket, works too
19:13 jonrafkind: so I guess the only remaining culprit is "bootstrap.rkt"
19:14 jonrafkind: can you paste bootstrap-lang.rkt?
19:14 masm: Yeah, but then it does not use the bindings from bootstrap.
19:14 jonrafkind: well yes you should use bootstrap-lang.rkt but maybe that file is doing something incorrectly
19:15 masm: It provides racket/base bindings with three or four modifications...
19:16 masm: Namely to define and lambda.
19:16 masm: But the bindings for begin-for-syntax and the phase 1 bindings are from racket/base
19:17 jonrafkind: are you gonna paste it or what
19:18 masm: http://paste.lisp.org/+2P6B
19:20 masm: I'm sorry that it is not that small... the essential is the provide at the bottom.
19:22 masm: Oh!
19:22 masm: I think I know what the problem is...
19:22 jonrafkind: I hacked the files enough to run (commented out all backend stuff) and it didn't have the issue
19:39 masm: Thanks jonrafkind.  I figured what the problem was.
19:40 jonrafkind: what was it?
19:40 masm: begin-for-syntax used to macro expanded to define-values-for-syntaxes.
19:40 masm: Not its core syntax.
19:40 masm: *Now
19:40 jonrafkind: oh ok
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20:23 SwashBuckla: hey - I am using Racket to interpret this function: (define (negate polynomial) (map (lambda (term) (make-term (* -1 (coef term)) (vars term))) polynomial)
20:23 SwashBuckla: Racket complains with "negate: expected argument of type <procedure>; given '((-8 (())) (4 ((x 1))) (3 ((y 1) (x 2))))"
20:23 SwashBuckla: but I don't see what is wrong here
20:23 SwashBuckla: Guile interprets this just fine, as well as Bigloo
20:24 SwashBuckla: why is it expecting me to pass in a procedure? Or any type for that matter?
20:26 jonrafkind: other than leaving off a ) from the end of that define your code should be fine I guess
20:26 asumu: SwashBuckla: Is that quoted expression the polynomial?
20:27 jonrafkind: how are you applying negate?
20:27 asumu: Oh wait, nevermind.
20:27 SwashBuckla: asumu: yea
20:27 SwashBuckla: it's some polynomial I'm trying to negate
20:27 SwashBuckla: crazy representation
20:27 SwashBuckla: I know
20:28 asumu: SwashBuckla: Are you sure that's from your negate?
20:28 SwashBuckla: jonrafkind: like (negate <polynomial>)
20:28 asumu: And you're not somehow using the built-in negate?
20:28 SwashBuckla: asumu: oh.. maybe
20:28 jonrafkind: oh yea thats probably the issue
20:28 SwashBuckla: I didn't know there was one
20:28 asumu: Yeah, it's in racket/function.
20:29 SwashBuckla: ah it's a name issue then, phew :)
20:31 SwashBuckla: it's annoying that racket silently permits me to redefine negate
20:31 SwashBuckla: but I guess it looks in it's own functions first, before mine?
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20:41 asumu: SwashBuckla: Racket will let you redefine bindings from the language.
20:41 asumu: But not required modules.
20:41 SwashBuckla: ah ok
20:42 SwashBuckla: asumu: thanks for pointing that out
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21:25 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/x3Nknw
21:25 RacketCommitBot: [racket/master] UI fixes and improvements to Check Syntax - Neil Toronto
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21:55 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/ym6ppQ
21:55 RacketCommitBot: [racket/master] compile the left-hand sides of define-judgment only once, not during each time we try to check a judgment - Robby Findler
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22:00 havvy: Hello. I'm new to Racket, but not to lisps. I've used Clojure and seen Sussman's lectures online.  What is Racket's equivalent to Clojure's (partial)?
22:04 offby1: havvy: probably curry
22:04 offby1: rudybot: ((curry cons 'a) 'b)
22:04 rudybot: *offby1: your sandbox is ready
22:04 rudybot: *offby1: ; Value: (a . b)
22:05 offby1: rudybot: ((curryr cons 'a) 'b)
22:05 rudybot: *offby1: ; Value: (b . a)
22:05 offby1: mmm ... curry
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22:06 havvy: Yep, that'd be it.  :)
22:09 offby1: I only discovered "curry" recently, and I love using it -- saves me from having to type "lambda" a lot.
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22:21 havvy: Is there a length property that works on both vectors and lists?
22:21 havvy: **function not property
22:21 offby1: don't think so.
22:22 offby1: the only functions I can think of that take a couple of different datatypes are the "dict" family -- they work on hashes, alists, and perhaps any struct that has some property or other.
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22:23 havvy: So no awesome sequence library like Clojure's.  :(
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23:53 asumu: FYI: sequence-length works on vectors and lists.
23:53 asumu: I see that havvy is gone now though. Ah well.
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