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00:09 shawnps: if anyone is on coderwall, i made a client in racket: https://github.com/shawnps/coderwall_racket
00:15 neilv: if anyone stabs their eyes with hot knitting needles, i've made a program in racket to help with that
00:16 jonrafkind: so its for when debugging c++?
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00:24 RacketCommitBot: [racket] plt pushed 7 new commits to master: http://git.io/VAb39A
00:24 RacketCommitBot: [racket/master] ffi: fix big-endian s->c conversion of bytes and shorts - Matthew Flatt
00:24 RacketCommitBot: [racket/master] add `variable-reference->module-path-index' - Matthew Flatt
00:24 RacketCommitBot: [racket/master] fix expansion state on `provide' transformer exception - Matthew Flatt
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00:25 shawnps: neilv: was it bad for me to post that?
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00:27 neilv: no, not at all
00:28 neilv: you might wish to make a planet package too
00:30 shawnps: oh, okay.  sorry, the needles in eyes thing was lost on me.
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03:30 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/3_hCNg
03:30 RacketCommitBot: [racket/master] New Racket version 5.3.0.8. - Eli Barzilay
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05:42 tim-brown: is there a really simple macro/syntax building tutorial for someone who just doesn't seem to get it (i.e. me)?
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10:28 asumu: tim-brown: what have you tried so far?
10:28 asumu: Have you read, for example, the PLAI chapter on it?
10:29 asumu: http://www.cs.brown.edu/~sk/Publications/Books/ProgLangs/2007-04-26/
10:29 asumu: (pg 315 or 319)
10:31 tim-brown: i'll take a look at it, thanks
10:32 asumu: I think it's pretty good.
10:32 asumu: OTOH, it doesn't cover the "state of the art" in macros since that's not the book's purpose.
10:32 asumu: I think such a document is currently missing.
10:32 tim-brown: there seem to be lots of competing forms for syntax-rules which get me too bogged down
10:34 asumu: There are really only two to care about: syntax-rules (or simple variations like define-syntax-rule) and syntax-parse.
10:34 tim-brown: the thing that gets me is that (define-syntax id (syntax-rules () ...)) is such a common construct, yet there is no simple (as in non-compound) form for it
10:35 asumu: syntax-id-rules
10:35 tim-brown: is that so?
10:35 asumu: Err, unless you mean somethign else.
10:35 asumu: Oh I see
10:35 tim-brown: nah... sorry didn't mean to come across harshly
10:35 asumu: There is (define-syntax-rule ...)
10:35 asumu: Nah, I didn't take it that way.
10:36 asumu: rudybot: (define-syntax-rule (my-or x ...) [(_ x y ...) (if x x (my-or y ...))] [(_ x) (if x x #f)])
10:36 rudybot: asumu: your sandbox is ready
10:36 rudybot: asumu: error: #<undefined>:1:71: define-syntax-rule: too many forms at: ((_ x) (if x x #f)) in: (define-syntax-rule (my-or x ...) ((_ x y ...) (if x x (my-or y ...))) ((_ x) (if x x #f)))
10:37 asumu: Right, that won't work.
10:37 asumu: Anyway, it's hard to shorten it because you need the multiple patterns.
10:37 asumu: With define-syntax-rule you can define very simple macros that only have a single pattern.
10:38 tim-brown: i'll plough on through plai
10:38 tim-brown: asumu: thanks
10:39 asumu: (and sorry, id syntax has nothing to do with what you were saying, I just misunderstood :))
10:39 asumu: tim-brown: NP.
10:39 asumu: rudybot: (define-syntax my-or (syntax-rules () [(_ x y ...) (if x x (my-or y ...))] [(_ x) (if x x #f)])
10:39 rudybot: asumu: the part of the config written by my(or stolen from others) is about 1500 lines
10:40 asumu: rudybot: (define-syntax my-or (syntax-rules () [(_ x y ...) (if x x (my-or y ...))] [(_ x) (if x x #f)]))
10:40 rudybot: asumu: Done.
10:40 asumu: rudybot: (my-or #t #f)
10:40 rudybot: asumu: error: #<undefined>:1:59: my-or: bad syntax in: (my-or)
10:40 asumu: Heh
10:40 tim-brown: you doing this to make me feel not bad about macros?
10:41 asumu: rudybot: (define-syntax my-or (syntax-rules () [(_ x y ...) (if x x (my-or y ...))] [(_) #f]))
10:41 rudybot: asumu: Done.
10:41 asumu: rudybot: (my-or #t #f)
10:41 rudybot: asumu: ; Value: #t
10:41 tim-brown: woo
10:41 asumu: :p
10:41 asumu: It's hard to live REPL things correctly.
10:41 asumu: If only you could do xrepl through IRC.
10:42 asumu: (I guess this is where people tell me to use emacs for IRC)
10:42 asumu: Also pretty sure my or macro is missing the singleton case, but ah well.
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10:43 offby1: asumu: emacs/IRC doesn't help much in this case
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10:45 bremner: ssssh, we almost had another convert.
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13:22 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/jvO6SA
13:22 RacketCommitBot: [racket/master] Fixed ellipses in scaled icons after fix to draw-ellipse in commit 1432912357 (mflatt); had been relying on earlier buggy behavior - Neil Toronto
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16:00 andkerosine: It seems unlikely that (if [boolean]) isn't possible in Racket; what am I missing?
16:01 Cryovat: What are you trying to do?
16:01 bremner: andkerosine: you can use when
16:02 bremner: andkerosine: assuming you want a 1 armed if. But I'm not so sure
16:02 andkerosine: bremner: Thanks much. Exactly what I was looking for.
16:02 andkerosine: Why is if only allowed to take procedures?
16:03 bremner: rudybot: init racket
16:03 rudybot: bremner: your sandbox is ready
16:03 bremner: rudybot: eval (when #f (/ 1 0))
16:03 rudybot: bremner: Done.
16:03 jeapostrophe: andkerosine: what do you mean "only allowed to take procedures"?
16:05 andkerosine: Ack, disregard the entire question. : / Wrapping the boolean in parentheses was the issue.
16:05 bremner: I wondered about that.
16:06 andkerosine: Still, seems like a learning opportunity. Why doesn't (#t) just evaluate to true?
16:07 bremner: because (foo) means procedure call
16:07 andkerosine: Fair enough.
16:07 bremner: () are not optional for grouping in lisp/scheme/racket
16:08 andkerosine: Rather, the opposite is the takeaway; you're not allowed to have extraneous ones either.
16:08 bremner: ((foo)) needs a procedure that returns a procedure, analogous to ** if you know C
16:08 jeapostrophe: and #t is not a function that can be called
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16:32 andkerosine: (define-values (left right) (regexp-split "\t" foo))
16:32 andkerosine: How does one go about "exploding" a list to do that sort of parallel assignment?
16:33 jeapostrophe: (apply values list-expression)
16:33 jeapostrophe: or
16:33 jeapostrophe: (match-define (list one two three) list-expression)
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16:35 andkerosine: Thank you.
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16:37 andkerosine: I tried applying append, but values makes much more sense.
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18:33 Cryovat: Is there a built-in function  to convert degrees to radians?
18:34 asumu: Cryovat: I don't think so. I've written this many times myself.
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18:34 asumu: Oh, actually.
18:34 asumu: See plot/utils
18:34 asumu: If you have a recent version of plot.
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18:34 asumu: OTOH, it doesn't really make sense to pull in all of plot for this.
18:35 asumu: (you could do (only-in plot/utils degrees->radians))
18:36 Cryovat: Thanks, I think i'll write one then
18:36 Cryovat: I don't really want a package dependency for one function
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21:51 presoh: Hi, I'm new to using the Racket. I've previously only programmed in the Python programming language and I was wondering if there is any way to spawn new processes, connect to their input/output/error pipes, and obtain their return codes?
21:52 presoh: In Python there a module you can import, called subprocess that can do this, http://docs.python.org/library/subprocess.html, I'm just wondering if there is any way to do this in Racket.
21:56 bremner: presoh: I'm not sure about that "spawn model", but there are places http://docs.racket-lang.org/guide/performance.html?q=places#(part._effective-places)
21:56 jonrafkind: there is a subprocess thing in racket
21:56 jonrafkind: I think places is is the wrong answer
21:56 bremner: could well be.
21:56 jonrafkind: presoh, http://docs.racket-lang.org/reference/subprocess.html?q=subprocess#(def._((quote._~23~25kernel)._subprocess))
21:58 bremner: I guess that gives the flexibility of running any command in the subprocess
21:59 presoh: Thanks, that was exactly what I was looking for
22:00 offby1: presoh: note that there are a lot of subprocess procedures, and (at least I find) it's tricky figuring out which one you want.
22:00 offby1: if I recall correctly, there isn't one which searches your PATH without invoking a shell
22:00 offby1: ... and that's what I always seem to want :-|
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22:09 presoh: offby1: I'll keep that in mind
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22:23 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/XeRZtw
22:23 RacketCommitBot: [racket/master] add `relative-in' - Matthew Flatt
22:23 RacketCommitBot: [racket/master] fix problem with module contexts and marks - Matthew Flatt
22:23 RacketCommitBot: [racket/master] fixes for `scribble/srcdoc' - Matthew Flatt
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23:09 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/4bUilw
23:09 RacketCommitBot: [racket/master] fix interaction between the framework's first-line-mixin and - Robby Findler
23:09 RacketCommitBot: [racket/master] adjusted the contract error messages so that the words expected/promised - Robby Findler
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