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00:28 _tca: how do i get &
00:29 _tca: rest arguments where i get indentation like &body in CL
00:31 jonrafkind: like (define (foo x . rest) ...) ?
00:34 _tca: jonrafkind: it's not about the rest parameters, it's about hinting to the drracket/emacs to indent it a special waym otherwise rest gets aligned with x
00:34 mithos28: _tca: There are only 3 kinds of indentation in drracket
00:35 mithos28: and they are determined by the first form in an sexpression
00:36 _tca: do you understand what i mean by &body mithos28?
00:36 _tca: for example, define has the type of indentation i'm talking about
00:36 _tca: is that not accessible to user definitions?
00:37 mithos28: it is in preferences
00:37 mithos28: and its not based on code/definition, its just textual based on symbol
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00:38 _tca: thanks
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01:31 jonrafkind: its kind of strange that (define (x . a #:z z) ...) fails with a read error
01:31 jonrafkind: the trivial solution is just to move #:z z to before the . a of course
01:32 jonrafkind: somehow I expected the first version to work though
01:32 mithos28: wow, me too
01:32 jonrafkind: the interesting thing is im not sure what to blame
01:33 jonrafkind: because (read "(x . z)") is just '(x . z)
01:33 jonrafkind: so the reader doesnt transform the . into something else
01:33 jonrafkind: it must be define that somehow checks if there is a . there and does something magic
01:33 mithos28: rudybot: eval '(a . b c)
01:33 rudybot: mithos28: your sandbox is ready
01:33 rudybot: mithos28: error: #<undefined>:1:4: read: illegal use of `.'
01:33 jonrafkind: well yea thats the error
01:34 jonrafkind: i guess the reader is unhappy when a . b is followed by more tokens
01:35 mithos28: yeah, actually what would you expect '(a . b c) be read as?
01:36 jonrafkind: ok i guess define checks if the tail of the argument list is an improper list and if so makes it the rest argument
01:36 jonrafkind: somehow that seems like a hack
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01:37 jonrafkind: rest arguments should use keywords like (define (f x #:rest a) ...)
01:37 mithos28: then how do you define something with the keyword rest?
01:37 jonrafkind: you dont, its off limits
01:38 jonrafkind: then you could even apply functions with a rest argument without using apply
01:38 jonrafkind: (f 1 #:rest (list 2 3 4))
01:38 jonrafkind: (apply f 1 (list 2 3 4))
01:38 jonrafkind: both would be the same
01:39 jonrafkind: or just (f 1 2 3 4) I guess too
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01:49 raphie: I have a list of lists-of-booleans, and I'd like to iterate through and produce a list containing the coordinates of each #t value in that two-dimensional list
01:50 mithos28: raphie: can you make a list of lists of the coordinates?
01:52 raphie: mithos28: I could flatten it if I had that. but map doesn't give an index, right?
01:52 neilv: raphie: you will want to use your own recursive procedure, not "map"
01:53 raphie: okay!
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03:28 lewis1711: that guys question reminds me I should write an each-with-index procedure
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04:23 djcoin: Just curious, what are the possible evolutions of Racket (future features) ? And is there some plan to build language on top of Racket, for example, a "pure" (à la haskell) or providing only purely functional datastructure (à la clojure) ?
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09:23 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/mmg2xw
09:23 RacketCommitBot: racket/master 6c58cde Matthew Flatt: repair for snip% change...
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09:26 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/Ke3Kxg
09:26 RacketCommitBot: racket/master 7f6d85f Jay McCarthy: Use raco test by default
09:26 RacketCommitBot: racket/master 0f6a519 Jay McCarthy: Add login link
09:26 RacketCommitBot: racket/master 78a69de Jay McCarthy: Undo this for now
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11:08 stamourv: rudybot: doc in-indexed
11:08 rudybot: stamourv: your sandbox is ready
11:08 rudybot: stamourv: http://docs.racket-lang.org/reference/sequences.html#(def._((lib._racket%2Fprivate%2Fbase..rkt)._in-indexed))
11:08 stamourv: lewis1711: ^
11:09 stamourv: djcoin: The cool thing about Racket is that anyone can build such as a language, and it's as easy as writing a library.
11:09 stamourv: In fact, languages *are* libraries in Racket.
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11:10 stamourv: A couple of days ago, soegaard mentioned a project that sounds like what you're talking about: https://github.com/samsergey/formica
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11:16 djcoin: stamourv: yeah that's why I was asking, i'm just beginning racket (and so does not know the environment) but I guess it would be possible to do so :)
11:16 djcoin: thanks for your reply
11:18 stamourv: djcoin: Once you become familiar with Racket, I highly recommend dyoo's excellent Brainfudge tutorial. It walks you through implementing your own #lang language.
11:18 stamourv: hashcollision.org/brainfudge/
11:19 stamourv: Matthew also had a great language-building tutorial at Racketcon last year, but you may need some familiarity with macros to fulyl understand it. The link should be available from the Racketcon web page.
11:19 soegaard: Also see Lazy Racket for something in the "Haskell" direction.
11:20 stamourv: As for understanding macros, I recommend greghendershott's Fear of Macros.
11:20 stamourv: www.greghendershott.com/fear-of-ma
11:20 stamourv: www.greghendershott.com/fear-of-macros
11:20 stamourv: Not sure what happened there.
11:20 djcoin: :)
11:20 djcoin: stamourv: thanks a lot !
11:21 greghendershott: stamourv: Syntax transformer error?
11:21 stamourv: No problem! If you have any questions, feel free to ask. :)
11:21 stamourv: greghendershott: Browser selection failure.
11:21 greghendershott: :)
11:22 stamourv: I'm pretty clumsy with the mouse.
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12:38 greghendershott: I'm having a serious infatuation with the Clojure threading macros -> and ->>
12:42 greghendershott: Writing (-> a f0 f1 f2) instead of (f2 (f1 (f0 a))) can be really clear.
12:43 greghendershott: And combined with #%app handing (dict? any/c) as (dict-ref any/c) lets you write nicely concise nested dict-refs as (-> dict key0 key1 key2). Which is really handy with stuff like JSON (where it's hasheq).
12:45 greghendershott: ^ I meant irc://znc.greghendershott.com:6667/#%25app handling both (dict key) and (key dict) as (dict-ref dict key)
12:45 greghendershott: Um, huh??
12:46 greghendershott: ^ I meant #%app handling both (dict key) and (key dict) as (dict-ref dict key)
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13:01 soegaard: It is indeed fun to experiment with syntax. It is expensive to modify %app for all applications, so one option is to rebind the uses of #%app that are written written with { }.
13:01 soegaard: See https://github.com/soegaard/this-and-that/tree/master/brevity for two such experiments.
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13:02 soegaard: Besides syntax for hashes there are convenient syntax for comon string operations. E.g.  {"foobar" 3 _} as short for (substring "foobar" 3 (string-length "foobar"))
13:03 greghendershott: soegaard: Oh neat. *perusing*
13:04 soegaard: I think I forgot to commit examples.
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13:11 greghendershott: Is it just me or is GitHub suddenly down?
13:11 dyoo: checking
13:11 dyoo: appears slow to connect.  Yup, I also can't connect to it successfully.
13:12 dyoo: https://status.github.com/ says that they're up though.  Hmm.
13:14 dyoo: greghendershott: unrelated, but so you've been looking at asumu's clojure project as well?
13:14 greghendershott: dyoo: Yes I have.
13:14 greghendershott: I like.
13:14 dyoo: How is it?  I don't know anything about clojure unfortunately.
13:15 greghendershott: I've only read about Clojure not sleeves rolled up. But it seems good.
13:15 greghendershott: I was however thinking of doing something myself where the spirit is not so much #lang clojure, as instead #lang clojure-ish
13:16 dyoo: hmm..  ok.
13:16 greghendershott: For example the -> id for threading macro is already taken for contracts. And using :keyword for Clojure maps feels weird in Racket
13:16 greghendershott: I'm more interested in the threading macros, and also an application syntax for dicts
13:17 dyoo: how about ~> ?
13:17 dyoo: it looks more thready
13:17 greghendershott: Yeah or two hyphens was my other idea, and quicker to type than shift for ~
13:17 greghendershott: Also I see ~> in Ruby as having some meaning I forget.
13:18 greghendershott: But yes it's very "thready", you're right :)
13:18 greghendershott: Anyway I was thinking about it as adopting a couple neat ideas from Clojure, as opposed to a way to port Clojure programs or buy into it more deeply.
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13:31 dyoo: greghendershott: github looks back
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13:34 RacketCommitBot: [racket] plt pushed 4 new commits to master: http://git.io/vOpQig
13:34 RacketCommitBot: racket/master 405e51b Robby Findler: adjust contour to track edit sequences better...
13:34 RacketCommitBot: racket/master 76cc599 Robby Findler: fix bug in check syntax introduced when adding the...
13:34 RacketCommitBot: racket/master 014abe6 Robby Findler: Rackety
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15:38 mye: can someone explain this error message:
15:38 mye: Cannot stuff (kont #<procedure:...abort-resume.rkt:154:25>) into a URL because it contains non-serializable pieces. Convert #<procedure:...formlets/lib.rkt:17:2> to a serializable struct
15:39 mye: why does it tell me to convert a procedure to a struct
15:39 dyoo: mye: odd.  Unsure.
15:39 mye: I've read something that stateless servlets put lambdas in structures or so
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15:40 dyoo: where does the lambda come from?  it looks like it comes from somewhere in formlets, right?
15:41 mye: dyoo: I can't tell which one it's complaining about. It's formlet-process I think
15:41 dyoo: hmm..  The error is saying that it doesn't know how to serialize the result of 'cross'.
15:42 dyoo: The formlet library itself appears to be written in racket/base, and that probably would cause a problem for the serializable continuation part.
15:43 dyoo: out of my element, admittedly.  You might need to check with Jay about this one.
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16:38 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/Zw06pg
16:38 RacketCommitBot: racket/master deac3fa Robby Findler: fix a bug in highlight-range exposed by the contour window...
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17:08 (topic) -: Racket -- http://racket-lang.org -- RacketCon videos/slides: http://con.racket-lang.org -- logs at http://racket-lang.org/irc-logs/
17:08 (names) -: gabot samth @ChanServ soegaard bitonic jonrafkind jeapostrophe billyoc francisl dyoo sirdancealot Kaylin Fare gf3 Shviller ASau myx mceier didi dzhus rins asumu jao parcha Shvillr rmathews sysop_fb mye tobi sizz noelw karswell` mithos28 notdan ivan\ qrstuv1 juanfra__ strawmn cdidd m4burns cipher Demosthenex Nisstyre bjz chandler rudybot offby1 errstr em Shambles_ merijn jschuster mau mario-goulart dca- basepi CoverSlide snorble_ fasta danl-ndi noam friscosam
17:08 (names) -: SeanTAllen cataska kristofer acarrico Cryovat Nereid SHODAN hyko ormaaj DarthRamone whoops otterdam Twey blubberdiblub eataix jaimef bartbes dented42 xulfer sethalves dsantiago ozzloy micro__ majoh spanner mattmight rapacity ivan` willem eMBee cky Raynes bremner ohama Draggor elliottcable xian pono JStoker greghendershott
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17:14 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/sccoqA
17:14 RacketCommitBot: racket/master 83413e4 Vincent St-Amour: Fix docs for text-based TR optimization logging....
17:14 RacketCommitBot: racket/master bf2768f Vincent St-Amour: Allow cast in typed/racket/no-check.
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17:54 dyoo: mye: it might be useful to show the code that wasn't working and the fixed version to Jay.
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19:03 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/-xgglg
19:03 RacketCommitBot: racket/master 31b6648 Danny Yoo: Add test case to show bug with inflate....
19:03 RacketCommitBot: racket/master c6775cc Danny Yoo: Fix to inflate: treat EOF as a character, as in the C code....
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19:18 dyoo: does anyone know how to use the 'deps argument for PLanet2 packages?
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19:20 dyoo: Ah, never mind.  Found out the problem.  The info.rkt that describes the dependencies of a PLanet2 package needs to be at the toplevel package directory.
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20:03 danl-ndi_: ok, syntax xformer question
20:03 danl-ndi_: rudybot: (define (test-syntax stx)
20:03 danl-ndi_: (syntax-case stx ()
20:03 danl-ndi_: 	((one two (three four ...) ...)
20:03 rudybot: danl-ndi_: Imagine this in a REPL: (define (test) (test-syntax 'x)) <return> (define-syntax test-syntax (syntax-rules () ((_ x) (list x x)))) <return> (test) <return> => (x x)
20:04 danl-ndi_: 	 #'(one two (three four ...) ...))))
20:04 danl-ndi_: urk
20:04 danl-ndi_: rudybot: (define (test-syntax stx) (syntax-case stx () ((one two (three four ...) ...) #'(one two (three four ...) ...))))
20:04 rudybot: danl-ndi_: your sandbox is ready
20:04 rudybot: danl-ndi_: Done.
20:04 danl-ndi_: rudybot: (display (test-syntax #'(1 2 (3 4 5 6) (7 8 9))))
20:04 rudybot: danl-ndi_: ; stdout: "#<syntax:1:80 (1 2 (3 4 5 6) (7 8 9))>"
20:05 danl-ndi_: well, ... hmm.  ok the problem is that the line number is from the function, not the original expression
20:05 danl-ndi_: does anyone know how to fix this?
20:06 dyoo: syntax/loc?
20:06 dyoo: let's see..
20:06 dyoo: rudybot: (define (test-syntax stx) (syntax-case stx () ((one two (three four ...) ...) (syntax/loc stx (one two (three four ...) …)))))
20:06 rudybot: dyoo: your sandbox is ready
20:06 rudybot: dyoo: error: #<undefined>:1:104: syntax: missing ellipses with pattern variable in template in: three
20:07 jonrafkind: lol osx and racket dont like each other
20:07 dyoo: stupid unicode!  :)
20:08 danl-ndi_: dyoo: tried it. it fails in the inner parenthesized lists
20:08 dyoo: give me a sec to fix that… ok, let's try it again..
20:08 danl-ndi_: as in, the (3 4 5 6) (7 8 9) syntaxes are from the function still. the 1 and 2 and the outer get correct info
20:08 dyoo: so whenever we're creating new syntax (the non-identifiers), we need to be careful of the location stuff.
20:09 dyoo: You can use things like syntax-parse to grab a hold of the structure itself.  Something like this:
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20:10 danl-ndi: my task is to get the thing matched by four to have original source info
20:10 dyoo: danl-ndi: https://gist.github.com/dyoo/4719330
20:11 dyoo: danl-ndi: it's the part when we're restructuring that we can accidently omit location, so the less restructuring we do, the better.
20:12 danl-ndi: ok sounds good.  I'm needing to destructure though.....
20:12 danl-ndi: even more specifically I need properly sourced ((four ...) ...)
20:13 danl-ndi: if that makes any sense
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20:19 danl-ndi: the kicker is that I think I had this working
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20:31 danl-ndi: ooh syntax-parse can do it....
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21:17 greghendershott: syntax-parse question. The #:fail-when and #:fail-unless directives backtrack and try to match other clauses. OK, but if I want to just fail with an error message?
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21:53 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/3UuTkg
21:53 RacketCommitBot: racket/master e7e64f4 Robby Findler: a better version of deac3fa2b30a45d0945f895f4181d916df922b58...
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22:41 qyqxt: given the following code, how make it more functional, i.e remove set!: http://paste.lisp.org/display/135248
22:41 qyqxt: thanks
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22:48 didi: qyqxt: Totally untested and straight transformation: <http://paste.lisp.org/display/135248#1>
22:50 qyqxt: thank you, didi
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