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00:18 dented42: can I create a macro that overrides the vector syntax? I know that you can have macros that transform function applications by using #%app , is there some equivalent for vectors?
00:18 mithos28: dented42: no, you need a reader extension for that
00:19 mithos28: or maybe #%datum will do what you want
00:19 mithos28: yeah, I think #%datum will do what you need
00:20 mithos28: rudybot: init
00:20 rudybot: mithos28: your sandbox is ready
00:20 dented42: that's what I was considering, it's a bit general though.
00:22 mithos28: rudybot: (define-syntax (#%datum stx) (if (vector? stx) #'(displayln 'hello) #'(displayln 'world)))
00:22 rudybot: mithos28: Done.
00:22 mithos28: rudybot: loop
00:22 rudybot: mithos28: error: loop: undefined; <NEWLINE>  cannot reference an identifier before its definition <NEWLINE>   in module: 'program
00:22 mithos28: rudybot: 'loop
00:22 rudybot: mithos28: ; Value: loop
00:22 mithos28: rudybot: #(4)
00:22 rudybot: mithos28: ; stdout: "world\n"
00:24 dented42: I would have thought that 'world expand into (quote (#%datum . world)) , which would lead to an infinite loop.
00:25 mithos28: no #%datum expands to quote not the other way around
00:26 dented42: oh, ok
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00:38 dented42: wait, I can do (vector? stx) ? I don't need to go (vector? (syntax-e stx)) ?
00:39 mithos28: dented42: you can, but you may get a buggy program
00:39 dented42: in what way?
00:39 mithos28: it will always be false
00:40 mithos28: My example was bad, as you can see rudybot output world not hello.
00:40 dented42: oh, right. yes I see.
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05:30 (nick) anonymous -> anonymou2
05:30 anonymou2: Hello everyone!
05:30 anonymou2: rudybot: write cons
05:30 rudybot: anonymou2: (lambda nil (not (org-contains-tags (\` ("NOTE" org-archive-tag)))))  ..(cons)
05:31 anonymou2: It seems I have found a bug in Racket 5.3.2
05:31 anonymou2: please run bin/racket (the console tool)
05:31 anonymou2: and write there
05:31 anonymou2: "write cons"
05:32 anonymou2: If I get it correctly:
05:32 anonymou2: > is prompt to input
05:32 anonymou2: a*
05:33 anonymou2: But it writes:> #<procedure:cons>
05:34 anonymou2: And > is not a prompt
05:34 anonymou2: like in DrRacket
05:34 anonymou2: please tell me if I should send a bugreport
05:36 anonymou2: The time when everyone should sleep in US...
05:36 anonymou2: I am going to be later.
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06:25 bremner: anonymou2: what do you think that should do? it is two expressions, and racket prints both of them. It's basically the same as typing "1 2".
06:26 bremner: It's true that racket behaves slightly differently than DrRacket there; arguably both are correct, I guess.
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06:30 anonymou2: bremner: I expect it to behave just as DrRacket: do not show the > prompt to enter
06:31 bremner: why do you expect that?
06:31 anonymou2: ...at least this is the way that bash, python behaves...
06:31 bremner: no
06:31 anonymou2: a minute, please...
06:32 anonymou2: > write cons
06:32 anonymou2: #<procedure:write>
06:32 anonymou2: > #<procedure:cons>
06:32 anonymou2: > write cons
06:32 anonymou2: #<procedure:write>
06:32 anonymou2: #<procedure:cons>
06:32 bremner: at least, I don't think you understand the difference between "(write cons) and "write cons"
06:32 anonymou2: I think I do:
06:33 anonymou2: "write cons": to show value of the write identifier and the cons identifier
06:33 bremner: no
06:33 bremner: oh, sorry, ok
06:34 anonymou2: (write cons) ask to execute write with argument cons
06:34 anonymou2: the*
06:34 bremner: fine.
06:34 anonymou2: so, behavior I expect from bin/racket:
06:34 anonymou2: the*
06:35 anonymou2: to show me > write cons
06:35 anonymou2: #<procedure:write>
06:35 anonymou2: #<procedure:cons>
06:35 anonymou2: but NOT:
06:35 anonymou2: > write cons
06:35 anonymou2: #<procedure:write>
06:35 anonymou2: > #<procedure:cons>
06:35 anonymou2: since > : ask to enter a command
06:35 (quit) Fare: Ping timeout: 240 seconds
06:35 anonymou2: but it is not an ask, I can't enter a command in this ask
06:36 anonymou2: #<procedure:write>
06:36 anonymou2: > #<procedure:cons>
06:36 anonymou2: > #<procedure:write>
06:36 anonymou2: >
06:36 anonymou2: oh, sorry
06:36 anonymou2: > write cons write
06:36 anonymou2: #<procedure:write>
06:36 anonymou2: > #<procedure:cons>
06:36 anonymou2: > #<procedure:write>
06:36 anonymou2: >
06:36 anonymou2: > is ask to enter in python, bash, DrRacket...
06:36 anonymou2: what is it here?
06:37 anonymou2: Python, Bash*
06:43 anonymou2: an*
06:43 anonymou2: ...
06:45 bremner: In my opinion, it's just a weird case, since normally one enters one racket expression at a time.  The interpreter happens to be prompting once for every expression. I've seen it with other interpreters: http://paste.debian.net/234908/
06:46 bremner: perhaps javascript isn't a good standard to aspire to ;)
06:49 (quit) vkz: Quit: vkz
06:52 anonymou2: http://paste.debian.net/234909/ ... So, bremner, this is just an ambiguity in your standard? (Also, tested again in my Google Chrome. If Racket was JavaScript, "write cons print" showed just the result of print)
06:53 anonymou2: would show*
06:53 anonymou2: in the standard*
06:56 anonymou2: http://paste.debian.net/234910/
06:57 anonymou2: http://paste.debian.net/234911/
06:58 bremner: all I meant to illustrate was feeding a multi-line js file to rhino, and have it repeat prompts.
06:59 anonymou2: >(print "a") (print "b")
06:59 anonymou2: "a"> "b">
07:00 anonymou2: What does rhino do if you ask it to console.log("a") ; console.log("b") ?
07:00 anonymou2: in one line
07:00 anonymou2: I think the last shows the bug too
07:01 anonymou2: (but it seems a bit strange... It seems like no-one uses console racket
07:02 anonymou2: ...Google Chrome doesn't show any prompt again before complete
07:02 anonymou2: neither does Bash
07:03 anonymou2: nor*
07:07 anonymou2: nor does similar thing DrRacket
07:07 anonymou2: a*
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08:35 bremner: anonymou2: you should try racket -il xrepl
08:35 bremner: it has the behaviour you like, I think
08:36 bremner: and many other nice features
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11:02 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/qfCgzQ
11:02 RacketCommitBot: racket/master ddacc3e Robby Findler: don't save repl interaction history when the new item is...
11:02 (part) RacketCommitBot
11:04 masm: (call-with-input-string "ã" (lambda (in) (regexp-match-peek-positions #rx"." in))) evaluates to ((0 . 2)) while (regexp-match-positions #rx"." "ã") evaluates to ((0 . 1))
11:05 masm: Is there an easy way to work around the problem in the first expression?
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16:17 soegaard: Could I get one of you to run this small program?    https://gist.github.com/soegaard/4973526
16:17 soegaard: It simply draws an "a" on a bitmap, and displays it DrRacket.
16:18 soegaard: On my computer (OS X)  there is a line missing on the right.
16:18 soegaard: Other sizes works fine, so I am a little puzzled.
16:23 bremner: it looks OK here (linux)
16:25 soegaard: thanks
16:25 soegaard: Maybe someone on OS X will try it too?
16:26 soegaard: It is not font specific. I see with "Euclid Math One" too.
16:32 dyoo: running..
16:33 dyoo: the right edge of the pen cuts off in the glyph.
16:33 dyoo: weird.
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16:33 soegaard: indeed
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16:33 dyoo: doing a quick investigation: as I understand it, cairo's reponsible for font rendering
16:34 soegaard: At first I thought the last stroke was missing, but it renders ok with 2*72 as the size.
16:34 soegaard: Changing the pen width doesn't do anything either.
16:35 dyoo: does smoothing have an effect on the font?  checking...
16:36 soegaard: Nope
16:36 soegaard: Okay, I forgot to actually set the pen, but he line is still missing.  (send bm-dc set-pen fine-pen)
16:39 dyoo: yeah, even if the pen is thick, same weird thing happens
16:39 dyoo: how odd!
16:39 dyoo: It's like the pen doens't know how to draw vertically.
16:42 dyoo: either that or the last part of the path isn't getting drawn, like some off-by-one error...
16:42 dyoo: whoa.
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16:43 dyoo: soegaard: conjecture: if the font size is odd, it draws ok.
16:43 dyoo: if it's even, it does not.
16:43 soegaard: !
16:43 soegaard: 2*72 works
16:43 dyoo: hmmm.  Ok, that's the nice thing about conjecture: they invalidate with a single case.  :)
16:44 soegaard: :-)
16:44 dyoo: ok, let me quickly look at text-outline and see if there's something glaringly obvious...
16:46 dyoo: well, I do se a bunch of cars and cdrs in the implementation of text-outline!  Ok, better look at it more closely…  Looking at collects/racket/draw/private/dc-part.rkt
16:47 soegaard: Maybe the font doesn't have the final (close)?
16:48 soegaard: Nope. Adding a manual close doesn't help.
16:48 dyoo: I'm looking at the path it constructs now to make sure it makes sense...
16:49 soegaard: Is there an easy way to print the path?
16:49 dyoo: I'm hacking it and putting a displayln in that for loop
16:50 dyoo: It looks like it uses an internal function to construct the path, though I'm not sure if it's public
16:51 (quit) mithos28: Quit: mithos28
16:51 dyoo: Nothing's jumping out at me yet.  Still reading through the path it's generating...
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16:59 dyoo: may be dependent on the font.  I switch to just the default face, and it draws ok.  So I think text-outline is doing something weird.  Still reading.
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17:09 dyoo: soegaard: sorry, have to go at the moment.  I haven't found anything yet.
17:09 soegaard: dyoo: That's fine. I need to get some sleep anyway ;-)
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17:18 soegaard: Turns out the problem only occurs when  'unsmoothed is used. Use (send send-bm set-smoothing 'unsmoothed) .
17:18 soegaard: Turning smoothing on/off for the font has no effect - since we are drawing our own paths.
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17:29 dyoo: soegaard: before you leave, I sent an email
17:29 dyoo: traced the issue down to the particular bitmap representation
17:29 dyoo: wow.
17:30 soegaard: nice!
17:30 dyoo: of course,  I have no clue _why_.  :
17:30 dyoo: :)
17:30 dyoo: https://gist.github.com/dyoo/4973820 demos it
17:30 soegaard: It is probably enough for Matthew...
17:31 dyoo: switch out the bitmap construction on line 52 with one of the other two, and you should see it
17:31 (nick) ijp` -> ijp
17:31 soegaard: That's even odd'er.
17:32 dyoo: yeah, right?
17:32 dyoo: ok, now I can go take that walk I was supposed to take today.  :)
17:32 dyoo: talk later!
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18:49 dented42: what are the 'Extra regexp' fields in the 'Indenting' part of the 'Editing' preferences in DrRacket for?
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19:30 Guest54350: Why was the box primitive type made?
19:30 Guest54350: (I googled "why racket box made")
19:31 Guest54350: bremner: thx
19:31 mithos28: Guest54350: Instead of what?
19:31 anonymou2: mithos28: huh? I mean there is a primitive type: Boxes
19:31 anonymou2: Why was it made?
19:31 anonymou2: were they*
19:32 mithos28: anonymou2: Because they are a useful data structure. I'm not sure I understand the root of your question.
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19:37 anonymou2 just tried (first time) to google on githum usage of box, but hasn't succed yet
19:38 anonymou2: It seems like it is easy to replace it with other types an it will be just as cool as a box
19:38 anonymou2: So, what the advance of a box
19:38 mithos28: over?
19:39 anonymou2: I don't get what do you mean by "over" now.
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19:40 anonymou2: Where can it be much better than anything else?
19:40 mithos28: It is mutable.
19:40 anonymou2: mithos28: have you ever used it?
19:40 mithos28: Yes
19:41 mithos28: https://github.com/shekari/concurrent-data/blob/master/data/nonblocking-mvar.rkt
19:41 rudybot: http://tinyurl.com/aont3q8
19:42 mithos28: That might be a bit complicated though
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19:46 anonymou2: Thanks(I don't get it yet)!
19:46 anonymou2: ...but anyway :))
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21:18 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/Ku7Z_w
21:18 RacketCommitBot: racket/master 1c2432e Robby Findler: improve the interactions history window a little
21:18 (part) RacketCommitBot
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21:59 brunov: Hi fellas, Racket newbie here. How can I go about installing the 'db' module? (require db) fails, and I cannot figure out what to do.
22:01 offby1: odd, I thought it was included with racket.  Perhaps your version of racket is too old.
22:02 brunov: racket -v says v5.1.3
22:03 brunov: It's what comes with latest-ish Ubuntu. I'll get the newest version, I see it's v5.3.3.
22:03 brunov: offby1, thank you
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22:06 asumu: brunov: the 'db' library was first in v5.2
22:06 brunov: asumu, I see. I'm downloading the latest version now :)
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23:35 dented42: I'm getting what seems like a weird error when I try to provide a function from a submodule that has a contract attached. my code is at ttp://paste.lisp.org/+2WL0 , I'm not sure if I'm misreading the documentation and doing something wrong, or if this is a bug in racket. thoughts?
23:55 Nisstyre-laptop: dented42: what line does the error refer to within that paste?
23:55 Nisstyre-laptop: same number?
23:56 dented42: it doesn't refer to a line in the paste, it refers to a line in racket/contract/private/out
23:56 Nisstyre-laptop: I haven't used Racket modules before (never had the need)
23:56 Nisstyre-laptop: dented42: oh my bad
23:57 Nisstyre-laptop: dented42: is the actual error with contract-out then?
23:58 dented42: the error doesn't occur if I provide bar without a contract, as in (provide bar)
23:58 dented42: so it would seem
23:58 Nisstyre-laptop: have you tried using provide/contract instead?
23:59 Nisstyre-laptop: dented42: oh I think I see the problem
23:59 Nisstyre-laptop: dented42: try moving the contract-out to the end of your program
23:59 dented42: that was the first thing I tried
23:59 Nisstyre-laptop: or not, nevermind, contract-out doesn't care about order