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02:15 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/_6J32Q
02:15 RacketCommitBot: [racket/master] fix bug in the handling of side-conditions - Robby Findler
02:15 RacketCommitBot: [racket/master] minor rackety - Robby Findler
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03:16 Demosthenes: hrm, i just noticed that racket's gui ISN"T based on Tk like most others.
03:17 mithos28: nope it is native(ish)
03:18 Demosthenes: ish ;]
03:18 Demosthenes: i was looking for common widgets that i already knew from tk... or at least understood
03:19 Demosthenes: ah, they're under *controls*, not widgets
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11:23 phoenixsun: how anyone knows to Racket windows installer to choose the wrong install directory?
11:23 phoenixsun: how = has
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11:23 phoenixsun: Basically I am pretty sure I am installing the 64bit version but its trying to put it in x86 Programs folder
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11:32 samth: phoenixsun: that's a known bug
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13:52 nismo: hey. im new to this and im trying to implement the eight queens program in drracket. does anyone have any suggestions?
13:55 jonrafkind: suggestions for what, to learn racket or how to implement eight queens?
13:56 nismo: how to implement the eight queens problem.
13:56 jonrafkind: use memoization
13:57 nismo: hmm?
13:58 nismo: nevermind - i think im onto something. thanks anyways dude
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14:09 freakazoid: cardboard programmers are the best kind
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14:35 jrslepak_: isn't 8 queens on the 2500 homework?
14:38 jonrafkind: no it was x'd out at the last minute to make room for the 45
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15:27 danking: jrslepak_: Yeah, this weeks 2500 is 8-queens.
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15:34 danking: jrslepak_: We could just point them at SRFI-41's discussion of backtracking via streams of success
15:34 jrslepak_: and call that the grand insight for the week?
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15:57 stamourv: samth: We had some?
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18:08 samth: stamourv: for the check-docs script
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19:20 loz`: hi
19:21 loz`: how do i set accessor for a struct field? is it possible?
19:26 jonrafkind: you want a mutator for a field? use #:mutable
19:27 jonrafkind: when you define the struct
19:27 jonrafkind: then you get set-STRUCT-FIELD!
19:31 loz`: jonrafkind: i want custom functions for setting and getting field
19:32 jonrafkind: you mean you want set-foo-x! to dispatch to your own functions?
19:33 loz`: problem is contract one-of/c dont wokring with strings, so i decided to store number, but set and get associated string
19:34 loz`: *isn't working)
19:36 jonrafkind: im not really following.. can you paste code?
19:37 asumu: loz`: Doesn't or/c work?
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19:40 loz`: asumu: hm, how do i specify exact strings with or/c?
19:41 loz`: i'm new to contracts idea..
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19:42 sstrickl: you can just write something like (or/c "orange" "banana" "apple") and it'll give you a contract that matches one of those three strings
19:42 sstrickl: that is, string values are auto converted to appropriate contracts
19:43 ApeShot: I often find myself wanting a value which is equal to no other value, and which others from outside my library cannot possibly create.
19:43 loz`: wow nice, thanks =)
19:43 ApeShot: I've been using empty struct instances to get such values
19:43 ApeShot: But it seems like there might be a more idiomatic way?
19:45 sstrickl: ApeShot: I'd say that's an idiomatic way of handling it in Racket.
19:45 ApeShot: There is nothing like an enumeration in ML?
19:46 ApeShot: In this case, it would only have one member
19:46 sstrickl: Either that or use some value you've allocated and kept a handle on (like a thunk or a cons cell) and just check eq? against it, but eh.
19:46 ApeShot: the nice thing about structs is that they play ok with pattern matching
19:46 sstrickl: oh, yes, the other idea I had wouldn't really work well there (without writing out the eq? check explicitly)
19:46 ApeShot: It just seems weird to create a struct and then instance it.  And then to have to hang on to both the single instance and the struct descriptor to pattern match
19:47 ApeShot: I guess I could extend the pattern matching facility...
19:50 asumu: rudybot: doc new-∃/c
19:50 rudybot: asumu: your sandbox is ready
19:50 rudybot: asumu: http://docs.racket-lang.org/reference/parametric-contracts.html#(def._((lib._racket%2Fcontract%2Fparametric..rkt)._new-~e2~88~83%2Fc))
19:50 asumu: ApeShot: ^
19:50 asumu: If you want to use contracts, that's one way to do it.
19:50 sstrickl: yeah, that's a nice way to ensure people can't get at the values you pass them through the contract system, good point.
19:50 (quit) mithos28_: Quit: mithos28_
19:51 asumu: ApeShot: Actually see http://pre.racket-lang.org/docs/html/guide/contracts-exists.html for a better intro
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20:01 ApeShot: interesting
20:01 ApeShot: Here is another question.  I'm a bit surprised that (match '(a b c) [`(hd ,@tl) tl]) doesn't return '(b c).
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20:01 ApeShot: What is the right way to express that intent using match's quasiquote?
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20:04 jonrafkind: what about (list hd tl ...)
20:04 ApeShot: you want (cons hd tl)
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20:05 ApeShot: I made a mistake up there, the match should have been `(,hd ,@tl)`
20:05 ApeShot: But its the ,@tl that doesn't work the way I expect
20:05 jonrafkind: i guess either way works
20:05 ApeShot: Sometimes the quasiquote is nicer, when writing interpreters, for instance
20:05 jonrafkind: bleh.. i hate quasiquote
20:05 ApeShot: it would be nice to match `(lambda (,@args) ,@body)`
20:05 jonrafkind: looks ilke perl
20:06 ApeShot: I'm less enamoured with quotation now that I've thought about hygeine and the meaning of variables
20:06 jonrafkind: ya
20:06 ApeShot: but when you consider that its just like using list or cons except with the expectation of quotation reversed, it makes sense to use it in forms with more quoted elements than not
20:07 ApeShot: It is just syntax.
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20:09 ApeShot: Ah
20:09 ApeShot: Here is the way to do it: (match '(a b c) [`(hd ,@(list tl ...)) tl])
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20:09 ApeShot: That will match tl to '(b c)
20:10 ApeShot: How did anyone ever program without pattern matching?
20:11 samth: ApeShot: i'll try to fix that so that what you wrote first works
20:11 jonrafkind: with very careful pointer arithmetic
20:11 (nick) samth -> samth_away
20:11 samth_away: jonrafkind: heh
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20:12 ApeShot: samth_away: seems like there isn't any reason to restrict the @name syntax.
20:12 samth_away: right
20:14 phoenixson: I am having a error right of the bat
20:15 phoenixson: 'module: illegal use (not at top level)'
20:15 phoenixson: I mean right after installing Racket for the first time
20:16 jonrafkind: do you have #lang racket at the top?
20:16 phoenixson: I do indeed
20:16 jonrafkind: whats your language set to
20:17 phoenixson: racket
20:17 jonrafkind: it should be 'use module declared in source'
20:17 ApeShot: Also, what is in your source file?
20:17 ApeShot: What else, I mean?
20:17 jonrafkind: i dont think 'racket' is a valid language setting
20:17 phoenixson: I did choose that option
20:17 phoenixson: ahh I see
20:17 phoenixson: so is Scheme valid
20:17 phoenixson: ?
20:18 jonrafkind: for what exactly, something you can write after #lang ?
20:19 phoenixson: yeah because as you said 'racket' isnt working
20:19 jonrafkind: so you have #lang racket at the top, right?
20:20 jonrafkind: at the bottom left of drracket there is a widget which lets you change the language being used
20:20 jonrafkind: if you click that a dialog box pops up, the first thing you can select is 'use the language declared in the source', then 'choose a language' with options for teaching languages and legacy languages
20:20 phoenixson: I have explored that but option
20:22 jonrafkind: im out of ideas, post a screenshot of drracket I guess
20:22 (quit) phoenixson: 
20:22 phoenixsun: ok will do
20:23 ApeShot: you can write #lang scheme (with a lowercase s, I believe)
20:24 phoenixsun: ok I tried that also and it the same error
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20:25 phoenixsun: but it seems that the language setting keeps going back to choose definition declared in source
20:26 ApeShot: I'm confused - it should already be on that.
20:26 ApeShot: Right?
20:26 phoenixsun: it was but you suggested that I choose a language
20:27 ApeShot: Oh, not me, but someone else.  Can you paste exactly what is in you file?
20:27 ApeShot: Or use pastebin, I suppose
20:27 ApeShot: That is the thing people do
20:27 ApeShot: http://pastebin.com/
20:28 phoenixsun: ok I will try pastebin
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20:36 phoenixsun: module: illegal use (not at top-level) in: (module anonymous-module slideshow (#%module-begin))
20:36 phoenixsun: that is what it shows me as an error
20:36 ApeShot: What is in your file, though?
20:36 ApeShot: When you press run
20:36 phoenixsun: I am not using a file
20:37 ApeShot: What are you using?
20:37 phoenixsun: I was using DrRacket and the interpreter
20:37 ApeShot: What did you type?
20:37 phoenixsun: #lang racket
20:37 ApeShot: Ohhh
20:37 phoenixsun: #land slideshow
20:38 ApeShot: You don't need to type that into the interpreter
20:38 ApeShot: Just put it at the top of the file you are working with and press run
20:38 phoenixsun: well I did remove that first line and it still didnt work
20:38 ApeShot: Then just enter commands into the interpreter
20:38 ApeShot: Don't remove the line
20:38 ApeShot: In your top window you should have #lang slideshow or #lang racket
20:38 ApeShot: Then press run
20:38 phoenixsun: ahhh
20:38 ApeShot: You should get an interpreter
20:39 ApeShot: Then type like (+ 1 1)
20:39 ApeShot: And you should get 2
20:39 ApeShot: The interpreter needs #lang racket or whatever to know which language to interpret, but you don't type that into it.
20:39 ApeShot: You let it detect it from the file.
20:40 phoenixsun: yeah it works now thanks
20:41 ApeShot: Awesome
20:41 ApeShot: Happy Schemeing/Racketing
20:42 loz`: is there any way to define constant (global) variable?
20:43 ApeShot: (define x 10)
20:44 ApeShot: And then don't use `set!` which isn't classy anyway
20:44 ApeShot: Typed Racket forbids mutation via set!, so there must be a way to do it.
20:45 loz`: hm, looks like i'll define a function that returns constant value
20:46 ApeShot: That is a reasonable way.
20:46 ApeShot: You may also what to use parameters
20:47 ApeShot: http://docs.racket-lang.org/reference/parameters.html
20:47 jamessan: ApeShot: you can use set! in Typed Racket
20:47 jamessan: you just have to use the same type
20:47 ApeShot: Ah, you can't `set!` at the interpreter after pressing run, I guess.
20:47 ApeShot: Or maybe I just misremember.
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21:11 loz`: hm
21:12 loz`: how do i unqoute list of lists in quaziqutation?)
21:12 loz`: for example
21:14 loz`: xerxpr for html, i need (p) (a [href ,(url)]) for every element of list
21:14 loz`: and map returns list, with ,@ i got ((p) (a [...])) ((p) (a [...]))
21:16 loz`: how to unqoute such lists?
21:17 ApeShot: `(a b ,@(reduce append list-of-lists))
21:17 ApeShot: is reduce in racket?
21:17 ApeShot: if not `(a b ,@(foldl append '() list-of-lists))
21:18 loz`: yeah, thank you :)
21:18 asumu: reduce is in srfi/1
21:18 loz`: rudybot: reduce
21:18 rudybot: loz`: (reduce #'(lambda (x y) (and x y)) '(t nil)) works in CL
21:18 asumu: (better to just use fold though)
21:18 asumu: rudybot: doc reduce
21:18 rudybot: asumu: no docs for a current binding, but provided by: srfi/1
21:19 asumu: rudybot: (require srfi/1)
21:19 rudybot: asumu: Done.
21:19 asumu: rudybot: doc reduce
21:19 rudybot: asumu: http://docs.racket-lang.org/srfi-std/srfi-1.html#reduce
21:19 asumu: loz`: ^
21:19 asumu: (but just use fold unless you specifically want that)
21:19 loz`: ok, foldl is good enough
21:21 (nick) Huggleslorx -> lorx|ssh
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21:27 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/bK1Peg
21:27 RacketCommitBot: [racket/master] fix futures bug - Matthew Flatt
21:27 RacketCommitBot: [racket/master] minor clean up - Matthew Flatt
21:27 RacketCommitBot: [racket/master] another round of unused variable clean-ups - Kevin Tew
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22:02 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/4sdlZQ
22:02 RacketCommitBot: [racket/master] adjust the double clicking in racket mode so that clicks on the - Robby Findler
22:02 RacketCommitBot: [racket/master] use build-path to construct path segments instead of putting slashes into strings - Robby Findler
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23:00 loz`: is it possible to make function that evaluates on compilation and just returns that value on calls?
23:01 mithos28: loz`: I think it is possible to do what you want
23:01 mithos28: you want something like (define-static (f) expr) and at run time (f) returns the value of expr?
23:03 loz`: mithos28: yep, is it possible?
23:03 mithos28: for certain values
23:03 mithos28: lists, numbers, symbols vectors
23:04 mithos28: you will need to write your own macro to do it though
23:04 loz`: there was such thing in cl
23:05 mithos28: expand out to something like #'(begin (define-syntax v expr) (define-static2 f v))
23:05 offby1: rudybot: (define-syntax-rule (f) 'frotz)
23:05 rudybot: *offby1: your sandbox is ready
23:05 rudybot: *offby1: Done.
23:05 offby1: rudybot: (f)
23:05 rudybot: *offby1: ; Value: frotz
23:06 offby1: rudybot: (cons (f) 'plotz)
23:06 rudybot: *offby1: ; Value: (frotz . plotz)
23:07 mithos28: offby1: I don't see any computation at compile time
23:07 (quit) phoenixsun: 
23:07 mithos28: and define-static2 should expand to (define f #`'#,(syntax-local-value #'v))
23:08 mithos28: loz`: CL doesn't do phasing correctly AFAIK so it probably is much more of a hack there
23:11 offby1: rudybot: (define-syntax-rule (f) (expt 2 (+ 1 2 3)))
23:11 rudybot: *offby1: Done.
23:11 offby1: rudybot: (cons (f) 'plotz)
23:11 rudybot: *offby1: ; Value: (64 . plotz)
23:12 mithos28: rudybot: (define-syntax-rule (f) (begin (displayln 'hello) 2))
23:12 rudybot: mithos28: your sandbox is ready
23:12 rudybot: mithos28: Done.
23:12 mithos28: rudybot: (f)
23:12 rudybot: mithos28: ; Value: 2
23:12 rudybot: mithos28: ; stdout: "hello\n"
23:12 mithos28: rudybot: (f)
23:12 rudybot: mithos28: ; Value: 2
23:12 rudybot: mithos28: ; stdout: "hello\n"
23:12 mithos28: doesn't work
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23:15 offby1: hm, that does seem wrong
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23:16 mithos28: the displayln is being called at run time not compile time
23:16 mithos28: which is not what loz` wants
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23:39 loz`: no problem, looks like it is too difficult for me now
23:40 asumu: loz`: How did this come up?
23:40 asumu: (maybe there's a simpler solution for what you want to do with that)