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00:01 offby1: the docs should tell you which languages have it.
00:01 ben_: and is it possible to assign images values, for example if i have a set of cards and I want to say your hand adds to 10 or yours adds to 35
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00:06 offby1: sure
00:06 offby1: well.
00:06 offby1: You can't modify the image itself, by sticking a value into it.
00:06 offby1: But you could make something that contains both an image and your value, and use that.
00:07 offby1: that's a typical use of "structs".
00:07 offby1: You could also use a cons or a vector or a list
00:08 offby1: rudybot: (struct image-and-value (im val))
00:08 rudybot: offby1: Done.
00:08 offby1: rudybot: (define i (image-and-value 'pretend-im-an-image 10))
00:08 rudybot: offby1: Done.
00:08 offby1: rudybot: (image-and-value-im i)
00:08 rudybot: offby1: ; Value: pretend-im-an-image
00:08 offby1: rudybot: (image-and-value-value i)
00:08 rudybot: offby1: error: reference to an identifier before its definition: image-and-value-value in module: 'program
00:09 offby1: rudybot: (image-and-value-val i)
00:09 rudybot: offby1: ; Value: 10
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00:13 ben_: so it would be something like (define Ace1 (image-and-value *image* 11)
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00:14 jonrafkind: ben_, where did you learn to put *'s around your constant names?
00:15 offby1: ben_: yep
00:15 offby1: you could also keep them separate -- have, say, a vector of images; the index of the vector would be the card's value.
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00:16 ben_: jonrafkind I was just trying to show that in my racket window I would have an image there if that makes sense
00:16 jonrafkind: ah
00:19 ben_: image-and-value is defined right?
00:19 offby1: if you first say (struct image-and-value (something or other))
00:19 offby1: Try It And See™.
00:19 offby1: rudybot speaks scheme.
00:20 offby1: rudybot: init lang/htdp-beginner
00:20 rudybot: offby1: your lang/htdp-beginner sandbox is ready
00:21 offby1: rudybot: (cons 3 4)
00:21 rudybot: offby1: error: cons: second argument must be a list, but received 3 and 4
00:21 offby1: ha, slick
00:21 offby1: rudybot: (cons 3 (cons 4 empty))
00:21 rudybot: offby1: ; Value: (3 4)
00:21 offby1: rudybot: (first 'wut)
00:21 rudybot: offby1: error: first: expected argument of type <non-empty list>; given 'wut
00:21 offby1: rudybot: (first ' (stuff and nonsense))
00:21 rudybot: offby1: error: #<undefined>:1:7: quote: expected the name of the symbol after the quote, but found a part in: (quote (stuff and nonsense))
00:21 offby1: rudybot: (first (list 'stuff 'and 'nonsense))
00:21 rudybot: offby1: ; Value: stuff
00:24 ben_: hmm ok
00:28 ben_: so i need to use first and stuff
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00:32 offby1: I dunno.
00:32 offby1: I'd be surprised if you didn't need it, but there's no law that says you do.
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00:38 ben_: offby1 thanks for your help I'm going to go
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00:44 new-racketeer: Hi guys! Does someone use drracket on Linux?
00:44 offby1: nah
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00:52 jrslepak: new-racketeer: having trouble with it?
00:53 new-racketeer: jrslepak: highlighting :\
00:56 jrslepak just uses the check-syntax feature
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03:38 Blkt: good day everyone
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05:19 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/0imIcg
05:19 RacketCommitBot: [racket/master] `sort' now infers properly -- test passes. - Sam Tobin-Hochstadt
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07:23 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/AZa8xg
07:23 RacketCommitBot: [racket/master] Include the platform in the windows installer's "human name". - Eli Barzilay
07:28 eli: offby1: You could submit a bug report about our lack of environment variable utilities -- like listing them, removing some, or modifying some in a parameterize-style (which is what you get in elisp, and is very convenient).
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07:41 sf17k: hey all, I've been working with bitmap% as an intermediary to save and load png files for basically image editing
07:42 sf17k: I'd like support for monochrome bitmaps but bitmap% only provides get-argb-pixels and set-argb-pixels so I can't seem to access the data
07:43 sf17k: is there another easy way to save/load pngs?
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07:52 AlbireoX: ??
08:04 veer_: To free foreign pointer by foreign-free(fn in  foreign lib), is this correct way to declare new-type?
08:04 veer_: (define new-type (make-ctype _pointer #f (lambda (x) (printf "free\n") (register-finalizer x foreign-free))))
08:05 veer_: oh! x is returned in (lambda (x) ...)
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08:33 veer_: sorry the above code is wrong , just ignore for now.
08:51 Gertm: What's a good way to check if a port is closed or catch the moment when the port closes?
08:51 Gertm: I'm browsing through the docs but I can't seem to find a good starting point for this.
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08:59 noelw: "For any kind of port, after it is closed, attempting to read from or write to the port raises exn:fail."
09:00 noelw: You can sync on almost any port event, but not apparently when it is closed
09:01 noelw: HTH
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09:07 Gertm: noelw: strange thing though, I had a network failure but my port I had open to a host on the inet never raised that exception.
09:07 Gertm: Or do I need to explicitly catch it?
09:08 noelw: Shouldn't need to explicitly catch it
09:08 noelw: but maybe the error never reached Racket?
09:08 Gertm: Well my code didn't crash, it just sat there waiting.
09:08 noelw: Might be buffering or something in the way that masked the error if it was short
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09:08 Gertm: Not sure how long it was.. could be half an hour or something.
09:24 noelw: Sorry, I don't know the inner workings
09:24 Gertm: I'll dig a little deeper into the docs. Thanks for your help.
09:26 veer_: haha and sobsob, after spending many hours to see printf message to
09:26 veer_: check if finalizer was freeing the memory , it turnout that message was
09:26 veer_: printed in linux console instead of repl, hidden from the view
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09:29 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/EHNeMQ
09:29 RacketCommitBot: [racket/master] fix some typos in a comment - Robby Findler
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10:21 scyrmion: How do you do default parameters? I read that you use [varname 'value], but I can't get this to work.
10:21 scyrmion: rudybot: (define (func [varname 1]) (display varname))
10:21 rudybot: scyrmion: your sandbox is ready
10:21 rudybot: scyrmion: Done.
10:21 scyrmion: what?
10:22 scyrmion: rudybot: (func)
10:22 rudybot: scyrmion: ; stdout: "1"
10:22 noelw: Works for me.
10:22 scyrmion: on my computer I got lambda~: not an identifier in: (param 1)
10:22 noelw: Maybe your #lang is wrong?
10:22 scyrmion: I'm using swindle-full
10:22 noelw: Ok, you have probably defined a curried function by accident
10:23 noelw: o.O
10:23 scyrmion: what is that?
10:23 noelw: My eyes buggin' out
10:23 noelw: I don't think swindle is actively maintained these days
10:23 noelw: though I could be wrong
10:23 noelw: If you're using Swindle, I don't know the answer
10:24 noelw: Sorry.
10:25 noelw: Just note that the Swindle language is not the same as the Racket language, so make sure you're reading the right docs
10:25 scyrmion: ok, thanks.
10:28 scyrmion: alright. swindle requires "&optional" before the [varname 'value
10:28 scyrmion: pair
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10:50 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/_NCFIA
10:50 RacketCommitBot: [racket/master] Typed Racket HISTORY for 5.2.1. - Sam Tobin-Hochstadt
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16:08 ben__: can you have a tickhandler, on tick stop-when time so it would be (define (tickhandler model)   (stop-when 10 seconds))
16:09 ben__: is it possible to make that 10 seconds something?
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17:48 Sag1: Could someone elaborate what, key=?: expects a KEY-EVTS as first argument, given an image is saying?
17:48 Sag1: (define (handle-key key)   (cond    [(key=? key "escape") (stop-with key)]    [(key=? key "w") (win blackjack2)]    [(key=? key "l") (loss blackjack2)]))
17:48 Sag1: second part is my function
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18:12 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/wgts0A
18:12 RacketCommitBot: [racket/master] db: fix sqlite3 #:use-place for raco exe - Ryan Culpepper
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18:50 Sag1: Could someone elaborate what, key=?: expects a KEY-EVTS as first argument, given an image is saying?
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19:14 ianjneu: The function key=? expects two arguments, both of which should be KEY-EVTS. The first argument supplied was not a KEY-EVT, but an image.
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19:16 Sag1: well, (define (handle-key key)   (cond    [(key=? key "escape") (stop-with "escape")]    [(key=? key "w") (win blackjack2)]    [(key=? key "l") (loss blackjack2)]))
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19:17 Sag1: it is saying key is an image?
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19:19 ianjneu: no, it's saying you failed to call handle-key with a KEY-EVT and that's why it's complaining.
19:21 Sag1: KEY-EVT is key event right...
19:23 ianjneu: yes, which is one of several special strings, like "up" or "down", not images.
19:25 Sag1: grrr so, I need (define (handle-key key key-event) or somthing like that??
19:26 ianjneu: No. Why do you want to compare an image with a key event?
19:26 ianjneu: Look at where you call handle-key. Make sure you're only giving it key events and not images.
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19:31 Sag1: ooohhh ianjneu, I am using big-bang so I am feeding it an image in my animation so that is where the image is comming from?
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22:14 ozzloy: is there such a thing as #lang c89 or some other really popular language?
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22:19 chandler: there's #lang algol60. can you get more popular than that?
22:24 asumu: ozzloy: you could try pyret. ;) http://planet.racket-lang.org/display.ss?package=pyret.plt&owner=wrturtle
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22:24 asumu: There are also various javascript related packages on planet but I don't know how many of them build/work.
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22:34 ozzloy: asumu, whoa
22:35 ozzloy: i was thinking that it would be a shortcut to getting tons of libs in racket
22:36 ozzloy: i'm kinda fuzzy on the details of how that would work though
23:05 Sag1: (define (handle-key key key-event)   (cond    [(key=? key "escape") (stop-with "escape")]    [(key=? key "w") (place-image single-card 500 365)]    [(key=? key "l") (place-image single-card 700 365)]))
23:06 Sag1: Does anyone know why this doesn't work I get this error on-tick: expected function of one argument as first argument; given function of 2 arguments
23:06 Sag1: im using big-bang which consumes an image
23:10 ozzloy: Sag1, at a high-level, handle-key is a fucnction with 2 arguments
23:11 ozzloy: so you could break it up into a function of 1 argument that returns a function of 1 argument
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23:12 ozzloy: (define (handle-key key) (lambda (key-event) ...))
23:12 ozzloy: i've not dealt with big-bang though, so not sure if that's the right direction to go in
23:14 ozzloy: shorthand for that is (define ((handle-key key) key-event) ...)
23:14 ozzloy: Sag1, is that helpful at all?
23:15 Sag1: Yes I see what you are saying I am using your idea just working through error messages thanks, I might have 1 more question about this on-key =)
23:17 ozzloy: awesome
23:17 ozzloy: glad that's helpful
23:24 Sag1: key=?: expects a KEY-EVTS as first argument, given an image is my error, now with my revised body
23:24 Sag1: (define (handle-key key key-event)   (cond    [(key=? key "escape") (stop-with key)]    [(key=? key "W") (place-image single-card 500 365)]    [(key=? key "l") (place-image single-card 700 365)]))
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23:28 Sag1: OK ignore all my questions ozzyloy I misunderstood at first works now thanks!
23:30 ozzloy: Sag1, woo!
23:30 ozzloy: glad i came back to the channel after you both had trouble and figured it out, and before you left
23:32 ozzloy: like asking "hey, can i help?" when just about all the work is done.  you can still look like you offered help, but without having to actually do anything
23:33 Sag1: haha yeah
23:35 Sag1: Is it possible to assign a picture values? I was trying to this yesterday?
23:41 ozzloy: idk
23:41 Sag1: hmm
23:46 ozzloy: is there a reason other than performance for having let, let* and letrec?
23:47 mithos28: ozzloy: they are useful for different things
23:47 ozzloy: oh nm, shadowing
23:47 mithos28: exactly
23:48 ozzloy: is performance also a reason?
23:48 ozzloy: like is performance of letrec much slower than let?
23:48 mithos28: depends on what you are doing, in most simple cases I bet they are optimized to the same thing
23:50 mithos28: given that you can write your example as a let and so don't need the recursive part
23:50 ozzloy: interesting
23:51 mithos28: letrec is slower if the mutation that is required by it semantics is possibly visible
23:56 ozzloy: makes sense vaguely.  i'm getting a foggy picture of compiler const-folding-like tricks happening
23:57 mithos28: do you have an application where this is relevant, or are you just trying to understand how it works?