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02:57 eli: stamourv: You're doing more than needed -- the main problem was just a way to specify where stuff goes.
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04:45 crk: is there a way to print a function in racket
04:45 crk: say I have a function defined, I "run" the code in drracket or in Emacs so that it gets loaded into the interpreter
04:45 crk: now is there a command that might print the whole code of a function?
04:48 crk: the thing is, I'm writing the CPS versions of some programs and I want to print the continuation function in each recursive call
04:48 crk: for better explaining what's going on
04:51 sindoc: crk:  Have you looked at http://docs.racket-lang.org/reference/stxops.html ?
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08:52 _p4bl0: hello, I creating a reader module which uses a parser generated by the parser-tools. My parser generates syntax objects. My parser generator thus takes an additional argument which is a syntax object and which is used to set the context when creating syntax objects. In the reader module in my read-syntax function, I don't know how I should proceed to get the context of the generated module form before generating it (so I can pass it to
08:52 _p4bl0: the parser).
08:55 crk: sindoc, I went through it but I'm not sure how I'd use it to get what I want
08:57 _p4bl0: here: http://pastie.org/3000276 : I'd like CTX to be a syntax object with the same context as the module form created just after. How can I do that?
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10:51 dobroerlanger: Hello. I am looking for a Scheme with the best C/C++ interfacing. Is it possible to pass lambda into C method and to use that lambda inside C++ object in Racket?
10:55 kudkudyak: dobroerlanger: you may look at guile.
11:11 otzi: Anyone knows an image processing library for racket?
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11:57 asumu: otzi: By image processing you mean like imagemagick?
11:58 asumu: (collects/ffi/examples has an example imagemagick FFI binding)
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12:02 otzi: I mean something that allows me to process images triplet by triplet
12:04 asumu: otzi: If you have a bitmap% object, you can use get-argb-pixels to get the byte representation out of it.
12:04 asumu: And work on that. If that's the kind of thing you mean.
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12:12 otzi: hm, looks promissing, thanks
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12:47 epsil: can a function and a macro have the same name?
12:48 jonrafkind: no
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12:48 jonrafkind: well, not at the top level at least
12:48 jonrafkind: you can always shadow a binding, so yes thats allowed
12:48 jonrafkind: sorry, top level is ok too, but not at the module level
12:50 epsil: I get a "duplicate definition" error for (define (foo) 1) (define-syntax-rule (foo) 2)
12:50 jonrafkind: yea at the module level you can't do that
12:51 jonrafkind: thats like doing (define foo 1) (define foo 2)
12:51 epsil: ah, okay
12:51 epsil: I'll do something else then
12:51 jonrafkind: but if you are in a new lexical scope its ok
12:51 jonrafkind: (define foo 1) (let () (define foo 2) ...))
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15:51 ozzloy: does racket have symbolic math libs?
15:52 jonrafkind: not that I know of
15:52 ozzloy: k
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16:14 ozzloy: .
16:42 ChaozZBubi: using drracket, what's the difference between using “%a” etc in signatures and “any”?
16:42 ChaozZBubi: it seems to not have any effects.
16:43 samth: ChaozZBubi: are you using the DeinProgramm languages?
16:43 samth: or rather, Die Macht der Abstraction?
16:44 ChaozZBubi: yes. it's actually german? Oo
16:44 samth: yup
16:44 samth: i'm not sure exactly what %a does there
16:44 ChaozZBubi: Die Macht der Abstraktion.
16:44 samth: unfortunately, those languages are under documented in english
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16:46 ChaozZBubi: well I am german so it doesn't matter. I was just confused for a moment, because I tried to start drracket with english “LANG” to see how it's called in the english version ^^
16:46 ChaozZBubi: “under documented”?
16:47 ChaozZBubi: so the usual use of %a is, to force the same type for parameters and/or return-value?
16:50 samth: ChaozZBubi: yes, that's what it's for
16:51 samth: by "under documented" i mean there's no docs whatsoever in english
16:51 samth: but i'm not sure exactly how the signature language enforces that
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16:54 ChaozZBubi: hm I see
16:54 samth: but i do think something is explained in the DMdA textbook
16:55 ChaozZBubi: I might take a look
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16:58 ChaozZBubi: doesn't say much about it.
16:58 samth: sorry about that
16:59 samth: but your thought is right -- %a is for saying that the input and output are the same sort of thing
17:00 ChaozZBubi: (or two arguments the same? e.g. %a %a -> %b )
17:00 samth: yes
17:00 samth: but probably that particular signature is a bad idea
17:01 samth: you should give a specific specification to the output, or reference one of the inputs
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17:04 ChaozZBubi: yea well, that was an example
17:04 ChaozZBubi: if it returns e.g. an record, of course I would use the type for the record.
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17:13 ChaozZBubi: or else it would be like returning “any” there.. so you wouldn't know how to deal with it.
17:20 (topic) -: Racket -- http://racket-lang.org --  logs @ http://racket-lang.org/irc-logs
17:20 (names) -: gabot stchang chandler masm rapacity Shvillr SHODAN eMBee jrslepak sethalves bfulgham crk yoklov danking_ jamessan snorble jrslepak_ abbe noelw offby1 Dulak Guest96097 jschuster dpritchett cky bremner stamourv @ChanServ ozzloy eli hyko mironovd zerokarmaleft shadgregory rudybot Shviller otzi dobroerlanger dsantiago noam_ loz` IKEAnnesP acarrico EmmanuelOga lorx|ssh_ shachaf _p4bl0` ernestas sir_lewk em realitygrill malkomalko karswell ambrosebs jaimef ernst
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18:54 epsil: how do I obtain the function bound to a symbol?
18:54 epsil: e.g., say I have a variable containing '+
18:54 epsil: how do I go from there to the /function/ +?
18:55 offby1: look for "namespaces" in the manual.
18:55 offby1: Also eval might work ...
18:55 offby1: rudybot: (eval '+)
18:55 rudybot: *offby1: your sandbox is ready
18:55 rudybot: *offby1: ; Value: #<procedure:+>
18:55 offby1: rudybot: doc eval
18:55 rudybot: *offby1: http://docs.racket-lang.org/reference/eval.html#(def._((quote._~23~25kernel)._eval))
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18:56 epsil: yeah, I currently use eval
18:56 samth: epsil: but probably the best thing to do is make a hash table that maps symbols to procedures, instead of using eval
18:57 epsil: I originally had the string "+", which I converted to a symbol with string->symbol, which I then spliced into a list representing a function call, which I then passed to eval.
18:59 samth: epsil: what are you implementing?
18:59 epsil: samth: a parser combinator framework
19:00 samth: so do you need to handle arbitrary symbols and turn them into racket functions?
19:00 samth: or just some particular list?
19:01 epsil: samth: I want to specify a semantic action for certain strings, like "+" and "-", which maps them to the corresponding racket function
19:01 samth: epsil: then i'd use the hash-table approach
19:02 samth: rudybot: (hash "+" + "-" -_
19:02 rudybot: samth: I mean, any hash can be broken or weakened given sufficient computing power, why even let them try?
19:02 samth: rudybot: (hash "+" + "-" -)
19:02 rudybot: samth: your lang/htdp-advanced sandbox is ready
19:02 rudybot: samth: error: #<undefined>:1:1: hash: this function is not defined in: hash
19:02 samth: rudybot: init
19:02 rudybot: samth: your lang/htdp-advanced sandbox is ready
19:02 samth: rudybot: init racket
19:02 rudybot: samth: your sandbox is ready
19:02 samth: rudybot: (hash "+" + "-" -)
19:02 rudybot: samth: ; Value: #hash(("+" . #<procedure:+>) ("-" . #<procedure:->))
19:02 samth: rudybot: (define h (hash "+" + "-" -))
19:02 rudybot: samth: Done.
19:02 samth: rudybot: (hash-ref h "+")
19:02 rudybot: samth: ; Value: #<procedure:+>
19:02 epsil: I currently have this: (lambda (a op b) (eval `(,op ,a ,b)))
19:02 epsil: where op is one of the symbols '+ and '-
19:03 samth: then create the hash table with the procedures you want to handle
19:03 samth: and do this:
19:03 samth: (lambda (a op b) ((hash-ref my-ht op) a b))
19:04 epsil: okay, but why is that better than eval?
19:04 epsil: or, alternatively, why is eval a poor choice in this case?
19:04 epsil: (as I assume it is)
19:04 samth: Matthew recently wrote a long piece about this
19:04 samth: http://blog.racket-lang.org/2011/10/on-eval-in-dynamic-languages-generally.html
19:04 rudybot: http://tinyurl.com/62xs38x
19:05 epsil: thanks, I'll look into it!
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22:57 loz`: 1
22:57 loz`: hi, i see semaphores in racket
22:58 loz`: what does internal couter reflect?
22:58 loz`: *counter
22:59 loz`: usually counter is amount of "locks" on this semaphore
23:00 loz`: and then zero counter means free semaphor
23:01 loz`: but reference says "when this counter is zero, the semaphore can block a thread’s execution until another thread increments the counter"
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23:16 eli: jonrafkind: How is your tool different from `raco make'?
23:17 jonrafkind: its not. keep reading your email
23:18 eli: jonrafkind: Heh...  And I was getting ready to tell about the bad choice for a name.
23:18 jonrafkind: yea.. i couldnt think of another one
23:18 jonrafkind: eli, can you show me a screenshot of how you set up the irc commit bot on github?
23:25 ozzloy: how does one find the path of the current file?  i've had this before but i can't find it now
23:25 offby1: there's a library called "etc" that includes a function like "current-source-directory" or something.
23:25 offby1: It's a surprisingly-long name.
23:26 ozzloy: i have a file that provides functions but can also be run by itself.  i'd like it to only do some stuff when it is run directly and not when some other file requires it
23:26 eli: jonrafkind: server: irc.freenode.net; port: 6667; room: #racket; Nick: RacketCommitBot; then check "Message Without Join", and "Active".
23:26 jonrafkind: do you know what pressing 'test' is supposed to do on that page?
23:27 eli: ozzloy: What offby1 suggests won't work for that.  Your best bet ATM is to define a `main' and use command-line arguments that run it when you use it directly.
23:27 RacketCommitBot: [racket] none pushed 3 new commits to master: http://git.io/uOUyeg
23:27 RacketCommitBot: [racket/master] Fix type of `remove-duplicates'. - Sam Tobin-Hochstadt
23:27 RacketCommitBot: [racket/master] Filesystem errors are not internal typed racket errors. - Sam Tobin-Hochstadt
23:27 RacketCommitBot: [racket/master] Don't run the slides. - Sam Tobin-Hochstadt
23:27 eli: jonrafkind: That.
23:27 jonrafkind: ok
23:28 eli: jonrafkind: The "without join" feature require some flag on the channel.
23:28 eli: Without it you won't see anything.
23:28 ozzloy: offby1, aha!  this-expression-file-name and this-expression-source-directory
23:28 offby1: ozzloy: : http://docs.racket-lang.org/mzlib/mzlib_etc.html?q=current-source#(form._((lib._mzlib/etc..rkt)._this-expression-source-directory))
23:28 ozzloy: jinx
23:28 jonrafkind: eli, you mean without the flag the bot won't even join?
23:28 offby1 rolls up his sleeve
23:28 offby1: ozzloy: I thought I was the only one who said "jinx".
23:29 ozzloy: eli, wait, are you saying those two functions won't do it?
23:29 ozzloy: offby1, twinsies!
23:29 ozzloy: (now i'm just playing)
23:29 eli: jonrafkind: The flag asks it to not join -- but then you need a channel that allows sending messages to it without joining.
23:29 eli: (IIRC.)
23:30 offby1: .oO("twinsies"?)
23:30 offby1: there ain't room enough in this channel for two bots!
23:30 jonrafkind: eli, do you know what that flag is?
23:30 eli: ozzloy: Yeah, it won't help you to distinguish being required "directly" or by something else.  There's currently no notion of such a "directly".
23:30 rudybot gets all huffy
23:30 eli: jonrafkind: No idea.
23:30 eli: ozzloy: Speaking about rudybot, see offby1's sources -- he's doing exactly what I suggested...
23:31 offby1: rudybot: source
23:31 rudybot: *offby1: git clone git://github.com/offby1/rudybot.git
23:35 jonrafkind: eli, its -n fwiw
23:37 ozzloy: eli, wait, are you saying that running a file via `./foo.rkt` makes that file get required?
23:38 jonrafkind: eli, I see that cia.vc will stay in the channel and can accept github commit messages, in case #racket should have +n again
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23:40 ozzloy: i'm not worried about a.rkt being able to distingush between being required by b.rkt and being required by d.rkt indirectly through c.rkt.  i want to distinguish in a.rkt whether it was run via `./a.rkt` or it was required (by b.rkt, let's say)
23:40 ozzloy: are you saying those amount to the same thing?  i could see that
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23:45 ozzloy: i like "el-buggo"
23:46 offby1: ozzloy:  I've since started using the github issue tracker.
23:48 ozzloy: understandable
23:49 ozzloy: btw, at first i thought eli was saying you, offby1, are a bot.  i was quite astonished at how well you did on the turing test!
23:50 offby1: yep, got a scholarship from it, actually
23:50 ozzloy: lulz
23:51 ozzloy: hmm... this whole passing a flag thing, idk...
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