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00:38 m4burns: good evening!
00:43 offby1: *grmpf*
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00:49 m4burns: offby1: grumpy?
00:49 m4burns: Consider the function: (define (in) (if (eof-object? (peek-char)) empty (cons (read-char) (in))))
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00:50 jonrafkind: is there a reason that function exists instead of just using read-bytes
00:51 m4burns: When this is executed in DrRacket 5.2's interactive area, the last line in the input is not captured when the user clicks 'EOF'.
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00:51 m4burns: jonrafkind: no
00:51 m4burns: Is this a bug, or the correct behavior?
00:55 offby1: rudybot: (define (in) (if (eof-object? (peek-char)) empty (cons (read-char) (in))))
00:55 rudybot: *offby1: Done.
00:56 offby1: rudybot: (with-input-from-string "wozzit" in)
00:56 rudybot: *offby1: ; Value: (#\w #\o #\z #\z #\i #\t)
00:56 offby1: m4burns: not pertinent to your question, but: "in" will use stack space proportional to the size of the input
00:57 jonrafkind: it would have made a list proportional to the size of the input as well so who cares
01:00 m4burns: offby1: i've only experienced this problem in DrRacket's repl
01:00 m4burns: offby1: also, the code segment exists only to illustrate the problem :P
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01:13 offby1: jonrafkind: good point
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02:04 RacketCommitBot: [racket] plt pushed 1 new commit to release: http://git.io/W4SbTg
02:04 RacketCommitBot: [racket/release] New Racket version 5.2.0.900. - Eli Barzilay
02:04 cky: 5.2.1 is coming out?! Wow.
02:06 jonrafkind: theres a release every 4 months, iirc
02:07 cky: 's good. :-)
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05:03 Blkt: good (late) morning everyone
05:10 noelw_away: word up
05:10 noelw_away: Hey, I'm not away anymore
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07:39 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/W1V6fQ
07:39 RacketCommitBot: [racket/master] ntoronto is responsible for images. - Eli Barzilay
07:39 RacketCommitBot: [racket/master] * Fix showing branch in non-master builds. - Eli Barzilay
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08:32 bremner: hmm. today in class someone doing the tutorial tried to run (colorize (circle 10) (list 255 255 0)) and racket complained about wanting a color, not a list. Are the docs wrong, or is there some simple pebkac?
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09:17 tim-brown: documentation of sequence-fold says "(sequence-fold f i s) ? (void)"
09:18 tim-brown: doesn't it return any/c ? the accumulated folded value?
09:18 tim-brown: (sequence-fold + 2 '(1 2 3 4))
09:18 tim-brown: rudybot: (sequence-fold + 2 '(1 2 3 4))
09:18 rudybot: tim-brown: your sandbox is ready
09:18 rudybot: tim-brown: ; Value: 12
09:18 tim-brown: that's a value, not void
09:23 eli: bremner: BTW, that thing you described with the double #lang sounds like a bug -- if you mail me exactly how you got it I'll try to figure it out.
09:25 chandler: tim-brown: what version are you using?
09:25 chandler: I see (sequence-fold f i s) → any/c
09:26 tim-brown: oh... unicod!
09:27 tim-brown: from 5.1.3 docs
09:27 chandler: rudybot: version
09:27 rudybot: chandler: 9233871
09:27 tim-brown: (sequence-fold f i s) -> (void)
09:27 chandler: hm. not what I was looking for
09:27 chandler: rudybot: eval (version)
09:27 rudybot: chandler: your sandbox is ready
09:27 rudybot: chandler: ; Value: "5.2"
09:28 bremner: eli: in DrRacket, with #lang racket in the definitions buffer and "Determine language from source", running retrieve generates a new window with #lang racket about the retrieved file (in racket 5.2)
09:28 chandler: I copied and pasted from the 5.2 docs. Sounds like it was a documentation bug in pre-5.2.
09:28 tim-brown: as long as it's fixed!
09:28 tim-brown crawls back under rock
09:30 chandler: Yes, I just found the commit. It was a bug in the documentation.
09:31 bremner: Is there any way to get that test-coverage coloring from IntermediateStudent in a typed/racket variant?
09:37 eli: bremner: No, and feel free to post a request...  (I've asked for it many times, and gave up.)
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09:40 bremner: isn't the "syntactic test suite coverage" a bit similar?
09:42 eli: bremner: Yes, but the colors are bad -- it's easy to miss a last bod of red text.
09:42 bremner: ok.
09:42 bremner: still, I think I don't want to force students to learn contracts for one assignment.
09:43 eli: How did contracts enter into it?
09:43 bremner: oh, just looking at your first assignment, which is in intermediate student.
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09:45 bremner: or I could just not make them do contracts.
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09:46 eli: bremner: ah, the idea there is a bunch of intro questions.
09:46 bremner: sure.
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09:46 eli: I make the server check that the solutions are correct, reject ones that are not.
09:46 bremner: but your students have already done htdp.
09:46 eli: And I tell them that since all solutions are going to be working, they're going to be graded only on style.
09:46 bremner: so it's review, at least in principle.
09:47 eli: Yes, you'll want something more organized there.
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10:00 bremner: eli: do you have some special emacs mode for editing at-exp files? The default scheme mode doesn't work that nicely for me.
10:01 bremner: I guess text-mode is an improvement ;)
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11:15 m4burns: eli: I mentioned some strange behavior with peek-char and get-char in DrRacket's repl last night.
11:16 m4burns: eli: It looks like any characters entered into the input box without a trailing newline are discarded when the user hits 'EOF'.
11:16 m4burns: eli: I'm not sure if this is a bug, or if I'm not understanding what's going on.
11:19 offby1: sounds vaguely bugaceous.
11:22 offby1: m4burns: curiously, if I put that code into a file, preceded by "#lang racket" and succeeded by "(in)", then run the file á la "racket whoa.rkt", and then type into it while it's reading ... it works as you'd expect.  Namely: even the last, incomplete, line appears in the output.
11:23 offby1: that makes it seem more likely that drracket's behavior is a bug, since it differs from the command line.
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11:35 m4burns: offby1: yeah, this is causing some confusion in the class I am tutoring
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12:11 offby1: m4burns: You can make it a "teachable moment"™: "Well, kids, welcome to the world of software, where everything is slightly broken"
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12:17 m4burns: offby1: "You'll spend your career trying to make things less broken, but you'll never really succeed." :P
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12:35 offby1: heh
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12:57 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/hpo6KA
12:57 RacketCommitBot: [racket/master] [honu] change to honu extension - Jon Rafkind
12:57 RacketCommitBot: [racket/master] [honu] provide #%top and #%datum for standard honu - Jon Rafkind
12:57 RacketCommitBot: [racket/master] [honu] fix for literal sets generated in a macro. replace . with -> for classes in the linq example - Jon Rafkind
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13:57 RacketCommitBot: [racket] plt pushed 6 new commits to master: http://git.io/NKFVLw
13:57 RacketCommitBot: [racket/master] added a cycle check to define-language so grammars like this one: - Robby Findler
13:57 RacketCommitBot: [racket/master] redex: adjust the test suites to clean up a few things; also make the - Robby Findler
13:57 RacketCommitBot: [racket/master] tweak the compiled representation of lw structs so they take less space - Robby Findler
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14:48 Oxryly: is there a racket alternative to mzscheme's fluid-let?
14:50 jonrafkind: parameterize
14:51 stamourv: bremner: neilv has a mode for scribble.
14:52 stamourv: http://www.neilvandyke.org/scribble-emacs/
14:56 Oxryly: jonrafkind: ugh... so it seems I'll have to clean up my code that uses fluid-let...
14:57 jonrafkind: (define fluid-let parameterize) ?
14:58 bremner: stamourv: thanks, trying it out.
14:59 Oxryly: based on my reading, parameterize can only rebind parameters, not just any top level definition, right?
14:59 (quit) freakazoid: Quit: Computer has gone to sleep.
15:00 stamourv: Oxryly: Right.
15:01 stamourv: That avoids potential surprises. Only things that are explicitly parameters can change dynamically.
15:02 Oxryly: some of my code likes to surprise some of my other code
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15:06 Oxryly: c'mon, that was a good one
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18:03 RacketCommitBot: [racket] plt pushed 8 new commits to release: http://git.io/-ghRcQ
18:03 RacketCommitBot: [racket/release] ntoronto is responsible for images. - Eli Barzilay
18:03 RacketCommitBot: [racket/release] * Fix showing branch in non-master builds. - Eli Barzilay
18:03 RacketCommitBot: [racket/release] added a cycle check to define-language so grammars like this one: - Robby Findler
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18:13 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/bhNIDA
18:13 RacketCommitBot: [racket/master] fix I/O race in test - Matthew Flatt
18:13 RacketCommitBot: [racket/master] make `scriblib/figure' work with `scribble/jfp' - Matthew Flatt
18:13 RacketCommitBot: [racket/master] collapse Racket HISTORY.txt for v5.2.1 - Matthew Flatt
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18:59 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/n7gQ5g
18:59 RacketCommitBot: [racket/master] fix problem printing symbols with unicode chars - Matthew Flatt
18:59 RacketCommitBot: [racket/master] protect `raco setup' from files in linked collection dirs - Matthew Flatt
19:10 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/ji6apQ
19:10 RacketCommitBot: [racket/master] replaced gamepad image with higher resolution version - Matthias Felleisen
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19:28 yoklov: hrm
19:29 yoklov: so setting a scale value to a negative number does not cause the dc to draw backwards.
19:29 yoklov: darn.
19:31 yoklov: nobody has any clue as to how i can flip a bitmap, do they?
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19:55 yoklov: hrm.  there's a function in 2htdp called flip-vertical
19:56 yoklov: looking at the source though, it? doesn't really seem to apply.
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20:09 yoklov: wow no i'm just a fool.
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20:09 yoklov: negative scale does work.
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20:38 kandinski: I am doing exercises (self-study), is there a racket mode/language that can run expression such as this: " (((λ f . (λ x . (f x))) (λ a . a)) (λ b . b))"? Thanks.
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20:44 freakazoid: kandinski: That has a fairly trivial translation to scheme - just put parens around the part between the λ and the . and remove the .
20:44 freakazoid: rudybot: (((λ (f) (λ (x) (f x))) (λ (a) a)) (λ (b) b))
20:44 rudybot: freakazoid: your sandbox is ready
20:44 rudybot: freakazoid: ; Value: #<procedure>
20:46 kandinski: rite, I had guessed that it returned (λ b . b)
20:49 freakazoid: nope
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20:55 kandinski: (λ a . a)?
20:55 freakazoid: Oh I see what you're saying
20:56 kandinski: (same function, but not the same procedure)
20:56 freakazoid: sorry, I thought you meant that it would return the last thing
20:56 kandinski: yes, I did
20:57 kandinski: now I realises it applies B to A, not A to B
20:57 kandinski: s/realises/realise/
20:58 freakazoid: right, x is (λ a . a)
20:58 freakazoid: and f is (λ b . b)
20:59 kandinski: thanks
20:59 freakazoid: oh wat
20:59 freakazoid: nesting parens
20:59 freakazoid: You should write this out on separate lines and indent
21:01 freakazoid: So you were right the first time
21:01 freakazoid: https://skitch.com/seanlynch/gacds/untitled-drracket
21:02 freakazoid: though actually the highlighting of expressions is more useful than the indentation
21:05 kandinski: oh rite
21:08 kandinski: thanks again
21:08 kandinski relurks
21:10 Oxryly: can someone help with this Racket error message: http://pastebin.com/vHgeK69R?
21:10 Oxryly: er, the url is just http://pastebin.com/vHgeK69R
21:11 Oxryly: I'm trying to control exported definitions by using a few layers of modules
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21:33 Oxryly: seem to have fixed it by doing (require "myfile.scm") instead of (require (file "myfile.scm")) everywhere
21:34 Oxryly: is there a racket replacement for mzscheme's make-immutable-hash-table?
21:40 Oxryly: make-immutable-hash
21:48 Oxryly: I'm migrating a scheme based system from PLT 3.51 to latest Racket, if you can believe that
21:48 Oxryly: (actually 3.50)
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22:03 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/modANA
22:03 RacketCommitBot: [racket/master] fix bug in lw struct generation - Robby Findler
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