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00:21 shawnps: oh, i'm dumb.  can use read-line on the input-port to see what's actually there
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01:52 osa1: does anyone here has The Racket Guide as PDF? I want to read it from my ebook reader
02:03 osa1: ok, I found the pdf
02:04 osa1: now,another question, is there a way to make geiser documentation tool work with emacs autocomplete-mode ?
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05:35 madmuppet006: I have installed racket on my computer running xp 64 and it will not run anyone else having this problem?
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09:13 RacketCommitBot: [racket] plt pushed 8 new commits to master: http://git.io/69mrTQ
09:13 RacketCommitBot: [racket/master] fix doc example - Matthew Flatt
09:13 RacketCommitBot: [racket/master] fix docs on `prop:{require,provide,provide-pre}-transformer' - Matthew Flatt
09:13 RacketCommitBot: [racket/master] doc edits - Matthew Flatt
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09:39 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/kxPFAA
09:39 RacketCommitBot: [racket/master] added blame context information to vector/c and vectorof contracts - Robby Findler
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10:58 Dormi: So I'm having a little problem with pulling an element from a list of lists. Here is the relevant code, if anybody cares.
10:58 Dormi: http://pastebin.com/CNJha7qA
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11:01 jeapostrophe: Dormi: that's not enough code to see the problem, plus you didn't actually show the whole error message
11:01 jeapostrophe: it looks to me like you have a world function that isn't returning a world
11:01 jeapostrophe: either way, you should write test cases for your functiosn
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13:06 sizz_: I was just browsing through the Rosetta Code website. There aren't many Racket examples so far, but one that caught my eye is: http://rosettacode.org/wiki/Animate_a_pendulum#Racket  which is easily the nicest of all the examples on the page!
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13:22 kreol[Ukr]: Hello all. I use The Racket Drawing Toolkit to draw Line-level in optimization methods i use a pixel and how can i transform my picture (increase width and height)
13:28 kreol[Ukr]: i'm sory i use  Graphics: Legacy Library   (require graphics/graphics)
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15:19 Cryovat: Hmm
15:19 Cryovat: Who's in charge of the OpenGL support?
15:19 jonrafkind: matthew i guess
15:19 Cryovat: I'm using a third party OpenGL library off Planet and I keep crashing Racket when trying to use vertex buffer objects
15:20 Cryovat: Starting to wonder if it's me doing anything wrong, or if there's a deeper rooted problem related to it
15:20 Cryovat: Since it's not supported in the official bindings
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16:37 kreol[Ukr]: Can any help with a simple program with using OpenGL? For example withdraw a pixels
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16:53 offby1: Am I the only one who finds it odd that "set-map" returns a list instead of a set?
16:54 Cryovat: That sounds a bit odd
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16:55 bartbes: well, it's just the return values accumulated
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17:06 netrino: offby1: perhaps it's because set do not hold unique elements. like (set-map (set 1 2 3 4) (lambda (x) (* x 0))) will yield the only 0, and that's not the desired result in most cases
17:11 offby1: netrino: hmm
17:11 offby1: netrino: and yet I find myself doing (list->set (set-map ... ...)) an awful lot
17:16 Cryovat: Does stephanh42 drop by here?
17:16 offby1: rudybot: seen stephanh42
17:16 rudybot: offby1: No sign of stephanh42
17:19 Cryovat: Hmm
17:19 Cryovat: Wonder if the best place to ask for support is Github or Planet
17:19 offby1: Cryovat: can't tell ya
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17:27 netrino: offby1: well, agree, it's a bit unexpected and strange behavior
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21:20 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/Iv4wdw
21:20 RacketCommitBot: [racket/master] up the future tests timeout - Robby Findler
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22:22 shawnps: Hi, I just tried to post to the users list after subscribing but got bounced, so I'll ask in here: I'm trying to convert some bytes (an HMAC-SHA1 hash) into a string, and I get an error: http://pastebin.com/jzYRBvhz
22:22 shawnps: if anyone has any clues as to why that's happening i'd appreciate any help :)
22:24 offby1: ahoy Typed Racket whizzim: can you explain this error? http://ix.io/2nX
22:26 jonrafkind: shawnps, why do you expect to be able to convert an sha1 hash to a string?
22:26 shawnps: isn't it just bytes?
22:26 jonrafkind: it is
22:27 jonrafkind: and thats what you got
22:27 jonrafkind: what sort of output did you expect?
22:27 shawnps: i expected bytes and then i wanted to convert it to a string
22:27 offby1: "Socratic Method" alert!  :-)
22:27 shawnps: is that wrong?
22:27 shawnps: i need it to be a string
22:27 jonrafkind: why is that
22:27 jonrafkind: what about a byte string instead of a regular string
22:28 jonrafkind: actually thats what it is, a byte string
22:28 shawnps: i need to tack it onto an API endpoint URL
22:28 shawnps: can i use the bytes for that?
22:28 offby1: URLs typically want just ASCII bytes, not any old bytes.
22:28 jonrafkind: you mean like you want to do http://some-server.com/api?<sha1 goes here> ?
22:29 shawnps: yeah
22:29 offby1: So you'll probably need to encode those bytes with e.g. %20
22:29 shawnps: api_hash=<sha1>
22:29 jonrafkind: probably what offby1 says is right
22:29 offby1: probably
22:29 shawnps: sorry, how do i do that?
22:29 offby1: rudybot: (nubmer->string 12 16)
22:29 rudybot: offby1: your sandbox is ready
22:29 rudybot: offby1: error: reference to an identifier before its definition: nubmer->string in module: 'program
22:29 offby1: rudybot: (number->string 12 16)
22:29 rudybot: offby1: ; Value: "c"
22:29 offby1: hm, that doesn't add a leading 0
22:30 offby1: gotta be a built-in way
22:30 jonrafkind: offby1, heh i wasn't trying to be socratic, just trying to pinpoint the place of confusion, it could of been either of us
22:30 offby1: that's what a true Socratite would say!
22:30 jonrafkind: heh
22:31 shawnps: no problem, i appreciate the help
22:31 offby1: rudybot: (let () (define (left-pad str) (if (< (string-length str) 2) (string-append "0"(left-pad str)) str))
22:31 rudybot: offby1: And string-length is typed (String -> Natural-number)
22:31 offby1: rudybot: eval (let () (define (left-pad str) (if (< (string-length str) 2) (string-append "0"(left-pad str)) str))
22:31 rudybot: offby1: error: #<undefined>:1:0: read: expected a `)' to close `('
22:31 offby1: rudybot: eval (let () (define (left-pad str) (if (< (string-length str) 2) (string-append "0"(left-pad str)) str)) (left-pad (number->string 12 16)))
22:31 rudybot: offby1: error: evaluator: terminated (out-of-memory)
22:32 offby1: damn
22:32 jonrafkind: Warning: You should compose this with base64-stuffer to get URL-safe bytes.
22:32 jonrafkind: shawnps,
22:32 jonrafkind: http://docs.racket-lang.org/web-server/stateless.html?q=HMAC#(def._((lib._web-server/stuffers/base64..rkt)._base64-stuffer))
22:32 nilyaK: like instead of foo.example.baz/index.rkt?hash=abc
22:32 nilyaK: like instead of foo.example.baz/index.rkt?hash=%61%62%63  <--encoded, not that you really need to encode abc but yea.
22:32 offby1: yay
22:32 shawnps: jonrafkind: thank you
22:32 shawnps: nilyaK: ah i see
22:34 nilyaK: like space being 32nd char in the ascii table is encoded as %20 (32 in hex) in URLs, but yea listen to other people they're smart etc
22:34 nilyaK: afk again
22:34 shawnps: now to figure out what a stuffer is
22:34 shawnps: nilyaK: thanks
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22:36 shawnps: jonrafkind: okay, sorry, i don't get it.  in that sentence, "you should compose this with base64-stuffer.." what is "this"?
22:37 jonrafkind: the HMAC-SHA1 function
22:37 jonrafkind: it just means to apply base64-stuffer to the output of HMAC-SHA1
22:37 shawnps: oh, okay
22:37 shawnps: thanks
22:38 jonrafkind: function composition means to take two functions, f and g, and do (f (g x))
22:38 jonrafkind: invented by smarmy academic people to sound smart
22:40 nilyaK: like computer science? invented by people who study algorithms to sound science-y?
22:40 nilyaK: :P
22:41 jonrafkind: algorithms people should be moved back to the math department
22:42 jonrafkind: there are some algorithms people in the office next to me, and i dont think we could say things to each other that the other would understand
22:42 shawnps: jonrafkind: so (base64-stuffer (HMAC-SHA1 x y)) would be composing it?
22:42 jonrafkind: yea
22:42 shawnps: i must be doing it wrong
22:42 shawnps: procedure application: expected procedure, given: #<stuffer>; arguments were: #"F\264\354Xa\27\25M\254\324\235fN]c\375\310\216\373Q"
22:43 shawnps: do i need to do like
22:43 shawnps: (base64-stuffer (lambda (x y) (HMAC-SHA1 x y))) or something
22:43 jonrafkind: oh you need to use (stuffer-compose)
22:43 shawnps: okay
22:43 jonrafkind: ok do this
22:43 shawnps: ah, i see
22:44 shawnps: (stuffer-compose (base64-stuffer HMAC-SHA1))
22:44 jonrafkind: ((stuffer-compose base64-stuffer (HMAC-SHA1-stuffer key)) input)
22:44 shawnps: thanks
22:44 jonrafkind: hm actually im not sure how to apply stuffers
22:46 shawnps: yeah, it worked but i can't apply it to a string
22:47 jonrafkind: shawnps, forget all of that
22:47 jonrafkind: do this instead
22:47 jonrafkind: (base64-encode (HMAC-SHA1 input key))
22:47 jonrafkind: http://docs.racket-lang.org/net/base64.html?q=base64&q=stuffer-compose&q=stuffer&q=HMAC-SHA1&q=base64-stufffer#(def._((lib._net/base64..rkt)._base64-encode))
22:47 rudybot: http://tinyurl.com/7h4hoc5
22:47 jonrafkind: stuffers are for serializing continuations
22:47 shawnps: all right
22:47 jonrafkind: which is useful when you are writing a web application and want to store the URL that the client will be using
22:48 jonrafkind: the url is tied to the continuation, and you can only store serialized url's
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22:58 shawnps: jonrafkind: and i should theoretically be able to call bytes->string/locale on that and get a string that i can use in the url, right?
22:58 shawnps: i'm getting a string that has carriage returns in it and stuff
22:59 shawnps: http://pastebin.com/A86sB5q7
23:01 offby1: shawnps: converting your bytes to a string with bytes->string sounds just horrible.
23:01 shawnps: what should i do?
23:01 offby1: I really think you should convert each byte to a three-character string whose first character is %, and whose 2nd and third characters are hex digits that encode the byte's value.
23:02 shawnps: all right
23:02 shawnps: and likely get rid of the \r and \n at the end?
23:04 shawnps: what's the point of having bytes->string?
23:04 shawnps: is this not a common use case?
23:06 offby1: rudybot: (define (bytes->hex-string bytes) (apply string-append (map (lambda (b) (format "%~a" (left-pad (format "~a" b)))) (bytes->list bytes))))
23:06 rudybot: offby1: your sandbox is ready
23:06 rudybot: offby1: Done.
23:06 shawnps: cool
23:06 offby1: rudybot: (bytes->hex-string (bytes 1 2 3 255 254 253))
23:06 rudybot: offby1: error: reference to an identifier before its definition: left-pad in module: 'program
23:07 offby1: rudybot: (define (left-pad str) (if (< (string-length str) 2) (left-pad (string-append "0" str)) str))
23:07 rudybot: offby1: Done.
23:07 offby1: rudybot: (define (bytes->hex-string bytes) (apply string-append (map (lambda (b) (format "%~a" (left-pad (format "~a" b)))) (bytes->list bytes))))
23:07 rudybot: offby1: Done.
23:07 offby1: rudybot: (bytes->hex-string (bytes 1 2 3 255 254 253))
23:07 rudybot: offby1: ; Value: "%01%02%03%255%254%253"
23:07 offby1: oops, forgot to hexify
23:08 offby1: https://gist.github.com/2691556 should be better
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23:19 shawnps: thanks offby1
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