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12:10 zdod: macro newbie question: after requiring racket/syntax, I still can't use with-syntax* in syntax-case.  Help?
12:11 samth: zdod: you probably need to do (require (for-syntax racket/syntax))
12:11 samth: assuming that your use of `syntax-case' is in a macro transformer
12:11 samth: ie, on the right-hand-side of a define-syntax
12:13 zdod: Thanks, it worked!
12:13 zdod: (...maybe)
12:15 samth: zdod: great
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12:45 zdod: Next newbie question: is there an equivalent of let-values for with-syntax (or with-syntax*)?
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15:40 WarWeasle: Hello, are there any examples of getting joystick events from a window?
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15:44 dyoo: Warweasle, i have an example of handling a keyboard event, but not a joystick event yet. http://stackoverflow.com/questions/8402218/how-to-make-a-gui-using-lisp-drscheme-or-common-lisp/8468211#8468211
15:44 rudybot: http://tinyurl.com/cndt3wo
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17:14 rsimoes: Is it possible to define macros with typed racket?
17:15 mithos28: rsimoes: Yes
17:15 rsimoes: Do any limitations get introduced?
17:15 mithos28: rsimoes: There are a few tricks though. Have you tried and are running into problems?
17:16 mithos28: depends on if you want the macro to work in an untyped context and a typed context
17:18 rsimoes: Okay; I'm still messing around; mind if I ping you later when I have some less open-ended questions?
17:19 mithos28: I should be on for another hour or two
17:19 rsimoes: groovy
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22:30 tauntaun: eli, your blog on syntax-case (4 Apr 2011) is nice, but I'm finding it hard to decipher your explanation of 'it' bindings, which I presume is intended to demonstrate of hygiene-breaking.
22:31 tauntaun: Could you add an example of unhygienic usage of 'it'?
22:31 tauntaun: (Actually two examples would be better.)
22:31 tauntaun: Or maybe write them here on IRC?
22:32 tauntaun: (...I meant unhygienic binding of 'it' when using 'while'.)
22:44 asumu: tauntaun: (let ([x 5] [it (lambda (x) x)]) (while (> x 0) (begin (it 5) (set! x (- x 1)))))
22:44 asumu: You expect the application of "it" here to work, but while magically rebinds them and you get an error.
22:45 asumu: Is that the kind of example you wanted?
22:59 tauntaun: asumu, yes, but I'd like to understand in detail how it breaks.  Let's assume that while is implemented as follows:
22:59 tauntaun: (define-syntax (while stx)
22:59 tauntaun: (syntax-case stx ()
22:59 tauntaun: [(_ test body ...)
22:59 tauntaun: (with-syntax ([it (datum->syntax stx 'it)])
22:59 tauntaun: #'(let loop ()
22:59 tauntaun: (let ([it test])
22:59 tauntaun: (when it
22:59 tauntaun: body ...
22:59 tauntaun: (loop)))))]))
23:05 tauntaun: Does the outer binding of 'it' to (lambda (x) x) get clobbered during the 'while'?
23:05 tauntaun: (clobbered -> shadowed)
23:09 asumu: tauntaun: It gets clobbered in the let expression.
23:09 asumu: (that the while macro expands to)
23:10 tauntaun: Is there any recommended reading on how to break hygiene to perform variable capture?
23:10 tauntaun: asumu, ^
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23:14 asumu: tauntaun: Do you mean that you specifically want to break hygiene? Or are you trying to understand the variable capture problem?
23:15 tauntaun: asumu: I want to break hygiene in order to capture variables.
23:15 asumu: I don't know of any good reading for that off the top of my head, mainly because Racketeers/Schemers tend to avoid doing that.
23:16 tauntaun: asumu: Yes, I know it's not idiomatic in Racket, but I had hoped that it could nevertheless be done,  with syntax-case.
23:22 tauntaun: Btw, asumu, is there a typo in that blog, in the code listing just before "Note that since 'it' is a pattern variable..."?
23:24 tauntaun: FWIW, here's a simple macro that does seem to capture the variable x, then squares it:
23:24 tauntaun: (define-syntax (sqr-x stx)
23:24 tauntaun: (syntax-case (datum->syntax stx 'x) ()
23:24 tauntaun: [id #'(* id id)]))
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23:42 asumu: tauntaun: Why do you think there's a typo?
23:42 asumu: (I mean, there might be one, I just don't know where you're referring to)
23:43 tauntaun: The pattern of the syntax case is 'id', whereas its template uses 'it'.
23:43 tauntaun: asumu, ^
23:45 asumu: tauntaun: I don't see an id...
23:46 tauntaun: asumu: It's the code listing right *before* the line of text I quoted.
23:46 asumu: This one?
23:47 asumu: (define-syntax (while stx)
23:47 asumu: (syntax-case stx ()
23:47 asumu: [(_ test body ...)
23:47 asumu: (syntax-case (datum->syntax stx 'it) ()
23:47 asumu: [it (syntax (let loop ()
23:47 asumu: (let ([it test])
23:47 asumu: (when it
23:47 asumu: body ...
23:47 asumu: (sorry for the paste spam)
23:48 asumu: You're looking at http://blog.racket-lang.org/2011/04/writing-syntax-case-macros.html right?
23:48 asumu: I did a ctrl+f for "id" but couldn't find it. I may be overlooking something obvious though.
23:49 tauntaun: asumu: please disregard.  I was viewing a copy of the blog that I saved to disk; must be an old one, before the typo was fixed.  In any case, thanks for verifying the correction.
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