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00:24 veer: is there simple one liner to get all files absolute path in a directory ?
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00:36 asumu: veer: (map (compose path->complete-path path->string) (directory-list "somedir"))
00:36 asumu: Does that do what you want?
00:41 veer: thanks asumu , I didn't knew about path->complete-path
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00:47 veer: asumu: it did not work , but build-path  does what I want
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01:00 eli: veer: In the nightly builds (and the next release) you can do thi: (directory-list #:build? #t)
01:00 eli: asumu: There's no need for a `path->string' there, btw.
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01:07 asumu: Oh, good point.
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06:00 RacketCommitBot: [racket] plt pushed 4 new commits to master: http://git.io/QDaLYg
06:00 RacketCommitBot: [racket/master] raco setup: print "nothing to do" to stdout instead of sdterr - Matthew Flatt
06:00 RacketCommitBot: [racket/master] adjust font-substitution hack for Mac OS X - Matthew Flatt
06:00 RacketCommitBot: [racket/master] racket/place: avoid place-termination cycle - Matthew Flatt
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12:36 Cryovat: TR question time:
12:37 Cryovat: I imported f32vector from ffi/vector using [opaque F32Vector f32vector?]
12:38 Cryovat: Will that predicate be checked every time an imported function taking f32vector as argument is invoked?
12:41 samth: Cryovat: yes
12:41 samth: but i believe that f32vector? is just a tag check
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12:46 Cryovat: I was doing some very primitive benchmarking
12:47 Cryovat: https://gist.github.com/1a2005b7a33bdad11871
12:47 Cryovat: Using this code
12:48 Cryovat: It looks like the typed version is slower by a magnitude of four
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12:54 Cryovat: I need to run, but will be back in a couple of hours, sorry
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13:00 samth: Cryovat: (a) i encourage you to make your gists public
13:00 samth: (b) you can have multiple files in 1 gist
13:00 samth: and yes, that's going to be slow
13:01 samth: b/c of all the contract checks
13:01 samth: if you're really just doing computation on float vectors, use flvectors, and you won't need require/typed at all
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14:05 Hortisimo: Hello, I am trying to integrate DrRacket into the GIMP using Dbus for summer research
14:05 Hortisimo: anyone know where I should start learning how to do that?
14:06 Hortisimo: thanks
14:06 stamourv: Hortisimo: Sounds awesome!
14:07 stamourv: I haven't worked with either GIMP or DBus, but it seems like a first step would be to find/write a Racket library for DBus.
14:07 Hortisimo: thanks, i think the biggest problem for me is learning how to make a dbus library
14:07 Hortisimo: yeah
14:08 stamourv: If you need to write one, you probably want to use an existing C library and the Racket FFI.
14:08 Hortisimo: cool, i'll check it out. thanks
14:08 stamourv: I haven't used the FFI myself, but I hear it's really easy to use.
14:09 stamourv: Several people on this channel have used it a lot, feel free to ask any questions you may have. :)
14:10 jonrafkind: there is a dbus interface in python you can probably base your library after
14:11 Hortisimo: awesome
14:11 Hortisimo: and i'd find that in the FFI?
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14:14 jonrafkind: what do you mean in the ffi
14:14 jonrafkind: i mean probably python uses its own ffi to talk to dbus, through ctypes or something
14:14 jonrafkind: so you can copy its interface with the racket ffi
14:14 jonrafkind: actually dbus is quite string based so maybe you don't even need any c functions to call it..
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14:16 Mungojelly: hi!  i'm learning some racket.  why are there so few things on this planet thing?  is it hard to get something posted there, or is really no one sharing much in racket?
14:17 asumu: Mungojelly: well, it's not as well populated as CPAN or Hackage yet. If you're comparing to those, it's just because there are fewer developers using Racket (yet).
14:17 asumu: There are people who also develop Racket code on github.
14:17 asumu: And haven't packaged it up on PLaneT (for various reasons)
14:18 Mungojelly: ok thanks asumu, i'll look around on github and see what's there :)
14:18 asumu: Is there a particular thing you're looking for?
14:18 Mungojelly: not really.  i just learned about php for a few days and it made me sad. :(  there's plenty of stuff written in that. :(  if there's not much written in Racket that makes me double sad. :((
14:19 Mungojelly: also i was wondering if i wrote random fun junk in racket if it would be hard to get it on PLaneT :D
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14:19 asumu: No, it's easy to get packages on PLaneT so feel free!
14:20 asumu: There's also a featureful web server and web app libraries in Racket, so I think it's fairly competitive with PHP.
14:20 asumu: (as a tool-chain. obviously as a language I think it's far better :))
14:21 Mungojelly: php left a foul taste in my mouth, i'm sorry i mentioned it, the only language i can think of in its class is old fashioned basic with lots of gotos.
14:21 Mungojelly: actually that almost makes me see the appeal.  i loved basic when i was little.
14:21 Mungojelly: i copied a whole program once out of a basic magazine my dad got me. :D
14:22 asumu: I used BASIC a bit when I was younger too.
14:22 asumu: (though I never looked back when I found Ruby and then Scheme)
14:22 Mungojelly: i could make racket a basic mode that'd be fun ;)
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14:23 (part) kreol[Ukr]: "Ухожу я от вас"
14:24 Mungojelly: yeah, when you find the real languages it's like "oh, why's everyone else doing it wrong then?"  but i'm still on the "huh?" side of that with monads, so i guess we're all at our own place.
14:25 Mungojelly: OH i remembered my actual, racket-related question!  where can i find a formal grammar??
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14:26 Mungojelly: i like to read the formal grammars of languages i'm learning.  i know lojban, so grammars of mere computer languages no longer scare me. :D
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14:27 Mungojelly: does that not make sense with racket?  is the formal grammar of racket the grammar of s-expressions?  it's like one line?
14:29 Mungojelly: oh i guess there's the grammar for comments and stuff, and the #lang line.  that might still be useful to me.  i just learned the #|  |# comment form a few moments ago.
14:30 friscosam: Mungojelly: if you're learning how languages are implemented in Racket, building a BASIC is a nice exercise: https://github.com/samdphillips/basic
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14:31 asumu: Mungojelly: http://pre.racket-lang.org/docs/html/reference/syntax-model.html#(part._fully-expanded)
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14:31 asumu: That's probably the closest thing to a formal grammar of Racket.
14:32 asumu: The thing is, you won't actually program in that language though.
14:32 asumu: Since the base "racket" language is actually built as macros on top of that core language.
14:33 Mungojelly: aha, so some of the usual grammar is in those macros?
14:34 Mungojelly: i've poked around the racket source a little but i don't understand it quite yet :)
14:35 Mungojelly: but it's beautiful!  good job, everyone!
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14:37 asumu: Thanks, and yes, the language(s) you'll actually use in Racket are defined by additional macros.
14:37 asumu: You may also want to see http://docs.racket-lang.org/reference/syntax.html
14:37 asumu: (more useful than the core syntax)
14:37 asumu: And the Guide is probably the most helpful in actually learning the language.
14:37 asumu: s/syntax/grammar/
14:39 Mungojelly: yes, i went through How to Design Programs a couple of years ago i think it was, and then recently i went through some tutorials, and now i'm reading the Guide and then i'm going to read the Reference.
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15:21 Shambles_: If you're encouraging people to build BASIC's, I do hope you encourage 'em to build BBC BASIC's.  I think that was the only one with references 'back in the day', so you could have real data structures, which is actually the main thing 'wrong with' old BASIC's.  Most actually allowed structured programming (I think GW-BASIC might have been an exception, but I'm not sure), even if people didn't use it.
15:29 Cryovat: samth: Delayed thanks for your response
15:29 Cryovat: Unfortuantely, flvector isn't an option
15:30 Cryovat: The project I'm tinkering with is a game that uses OpenGL for graphics
15:31 Cryovat: And unless I've misunderstood how flvector works/is represented in memory, the ffi vectors are the only things that looks like what it expects
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15:53 Cryovat: If a flvector looks the same in memory as a f32/f64vector, I can use that instead
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15:56 Cryovat: For the record, I'm using buffer objects, and the functionality depends on OpenGL being able to copy contiguous arrays of homogenous numbers between system and video memory
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16:13 samth: Cryovat: flvectors are also represented homongenously
16:14 samth: see `flvector->cpointer`
16:14 samth: rudybot: (require ffi)
16:14 rudybot: samth: your sandbox is ready
16:14 rudybot: samth: error: default-load-handler: cannot open input file: "/mnt/racket-5.2.900.1/collects/ffi/main.rkt" (No such file or directory; errno=2)
16:14 samth: rudybot: (require ffi/unsafe)
16:14 rudybot: samth: Done.
16:14 samth: rudybot: doc flvector->cpointer
16:14 rudybot: samth: http://docs.racket-lang.org/foreign/Miscellaneous_Support.html#(def._((quote._~23~25foreign)._flvector-~3ecpointer))
16:17 Cryovat: Ah, great
16:17 Cryovat: Will the data type depend on architecture?
16:17 samth: no, it shouldn't
16:17 samth: ah, but it's not f32s
16:18 samth: so that might be an issue
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16:20 Cryovat: Are they doubles?
16:23 samth: yes
16:26 Cryovat: Damn
16:27 Cryovat: Switching to an flvector made my hacky benchmark twice as fast as the non-typed version
16:27 Cryovat: But the opengl.org wiki recommends against doubles
16:30 Cryovat: Maybe i could hack together some unsafe code that copies a double array to a f32vector
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16:33 samth: that would be tricky
16:33 samth: you'd have to convert doubles to floats
16:33 samth: really tr should just support f32vectors
16:34 Cryovat: If I knew how, I'd make a patch for it
16:37 Cryovat: Anyways, thanks for taking the time to answer my questions :)
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20:08 Kaylin: hi, just started playing with racket and tcp, except I seem to be doing something wrong here, it's probably obvious bc I am a total noob but what is it? http://pastebin.com/GcagiSNg
20:08 Kaylin: I tried to connect to my friend's IRC server, I can connect with telnet but this code doesn't seem to work, when I use printf it looks like the correct data output in DrRacket, idk what I screwed up.
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21:33 asumu: Kaylin: maybe it's the buffering mode?
21:34 Kaylin has no idea.
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