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03:58 Blkt: good morning everyone
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06:12 haruki_zaemon: howdy, I don't suppose there's a nice IRC client for racket? I want to re-write a bot using racket.
06:16 bremner: haruki_zaemon: rudybot is written in racket
06:18 haruki_zaemon searches for rudybot
06:20 haruki_zaemon: bremner: https://github.com/offby1/rudybot ?
06:21 bremner: sounds right
06:21 haruki_zaemon: thanks for the heads up
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08:43 RacketCommitBot: [racket] plt pushed 3 new commits to master: http://git.io/HQ4TDw
08:43 RacketCommitBot: [racket/master] added test cases for phase issues in the module language repl - Robby Findler
08:43 RacketCommitBot: [racket/master] Change the drracket repl so that it doesn't show the stacktrace button - Robby Findler
08:43 RacketCommitBot: [racket/master] Fixed some bugs in the double-stacktrace window; adjusted the repl to - Robby Findler
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09:18 Shviller: Hi, all. Is there an OpenID library for Racket?
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09:21 samth: Shviller, i think there's someone who worked on that that's up on github
10:07 (topic) -: Racket -- http://racket-lang.org --  logs @ http://racket-lang.org/irc-logs
10:07 (names) -: gabot samth_away asumu Em eMBee Shviller ohwow tonyg abbe SHODAN jamessan wtetzner jrslepak mario-goulart collin shachaf_ shader` masm tewk adzuci s_chng haruki_zaemon chezduck tim-brown Blkt Lajla karswell offby1 _p4bl0 gmcabrita si14 acarrico Demosthenes cipher tomku rudybot rotty jschuster stamourv mattmight brainproxy sethalves tauntaun eli ernestas bremner snorble sepisultrum hyko petey gf3 zerokarmaleft danking zakwilson sir_lewk ozzloy GeneralMaximus
10:07 (names) -: rapacity cky @ChanServ
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12:18 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/3LnK5w
12:18 RacketCommitBot: [racket/master] Allow internal definitions in a `for/vector' with a #:length. - Eli Barzilay
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12:21 Demosthenes: any other recommendations for "simple" parser examples? =]
12:24 mithos28: Demosthenes:  I have a project where I used it, but it looks like I never put it on github. I'll give you a link in a sec
12:27 (nick) shachaf_ -> shachaf
12:27 mithos28: demosthenses: https://github.com/shekari/tiger
12:28 mithos28: It was a project to compile the tiger language from Appel's book, the whole thing might not compile without my llvm library but the parser part should
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12:32 Demosthenes: i'm learnign the whole idea of lexing and parsing... i basically got lex down, and parse i'd default to match, but i'm trying to udnerstand the native parse lib
12:33 mithos28: My project uses that if I remember correctly
12:33 Demosthenes: k
12:34 Demosthenes: my use case doesn't help, i'm not parsing a language per-se, i'm trying to validate text records
12:34 mithos28: check the tiger-parser.rkt file: https://github.com/shekari/tiger/blob/master/tiger-parser.rkt
12:34 mithos28: It should be similar in that each record is like a statement in a language
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12:38 Demosthenes: its the parse/grammer i don't get. the docs are very shallow.
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14:29 ozzloy: if i do (printf "string with an actual newline, not just tilde n") will that be converted to system specific newline across mac, linux, and ms windows?
14:32 mithos28_: ozzloy: I don't think so, i think it will be what is literally in the string. And also what do you mean by actual newline? I don't think you mean that, because no one actually uses the newline character.
14:32 ozzloy: you're right, i mean linefeed and not an actual newline
14:34 mithos28_: I don't think anything is special is done, because that would be confusing.
14:34 ozzloy: thanks
14:35 ozzloy: although now that i think about it, it would be a cool feature if actual newlines in strings were converted to system specific newlines at runtime
14:39 jonrafkind: you want \n to turn into CRLF on windows?
14:40 ozzloy: not desperately, but it would be neat if it worked that way
14:40 ozzloy: wait, "\n" does, doesn't it?
14:41 mithos28_: ozzloy: nope
14:41 mithos28_: http://docs.racket-lang.org/reference/reader.html?q=reader&q=string#(part._parse-string)
14:43 ozzloy: oh
14:44 ozzloy: is "~n" the same thing as "\n" and is there an escape sequence that gets converted to system specific newlines?
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14:47 mithos28_: ozzloy: not that I know of, and couldn't find one
14:48 ozzloy: that's surprising
14:48 rapacity: doesn't ~% work ?
14:49 rapacity: rudybot: (printf "~%")
14:49 rudybot: rapacity: your sandbox is ready
14:49 rudybot: rapacity: ; stdout: "\n"
14:50 mithos28_: rapacity: thats a linefeed, not a system specific newline
14:50 ozzloy: http://docs.racket-lang.org/search/index.html?q=~%25&q=rackunit doesn't work.  where did you find it?
14:50 rapacity: ah
14:50 ozzloy: rapacity, where did you find ~%
14:52 rapacity: http://docs.racket-lang.org/reference/Writing.html?q=printf though according to that it's the same as ~n
14:52 ozzloy: so "~%" == "\n" == "~n"
14:53 ozzloy: oh, maybe not.  "which is equivalent to \n in a literal format string" makes me think there are situations where they're not equivalent
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15:17 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/Ehc3zA
15:17 RacketCommitBot: [racket/master] fix errortrace for phase N outside of module - Matthew Flatt
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21:11 ghs: hi
21:11 ghs: I need help
21:12 bremner: what is the nature of your racket emergency?
21:12 jonrafkind: for bank loans press 1, for poison related inquiries press 8
21:12 ghs: (define (listofstring los)   (cond [(empty? los) empty]         [else          (string-append "accio" (first los)              (listofstring (rest los)))]))
21:12 ghs: I can't get this to work
21:12 ghs: I am trying to
21:12 ghs: incoroporate a string append type program
21:12 ghs: into a list
21:13 ghs: er not program
21:13 ghs: function I mean
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21:19 failing: hello, could someone help me?
21:20 failing: im trying to write a function that adds the string "accio " to each term on a list of strings
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21:36 jrslepak_: failing: what part of this task has you stuck?
21:37 acarrico: ghs, failing: Harry Potter is always copying Hermione's homework, so what the heck: (map (lambda (x) (string-append "accio" x)) '("broomstick" "house-elf" "homework"))
21:51 failing: one sec, let me see if i can solve it with acarricos post
21:52 asumu: failing: If you don't understand map like the back of your hand, you may want to try writing this as a simple recursive function on lists.
21:53 asumu: (see Design Recipe)
21:54 failing: how would i do that, i tried the recursive function, but i dont know where i went wrong
21:56 jrslepak_: you are ghs?
21:56 failing: umm, no
21:56 jrslepak_: ghs asked a remarkably similar question
21:57 jrslepak_: including posting an attempt to solve it by structural recursion
21:57 asumu: failing: I suggest reading this chapter http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-13.html#node_chap_9
21:57 failing: its a question for a midterm practice, he might be in my class i guess
21:57 failing: ty asumu
22:00 asumu: Actually, the 2htdp chapter on this is pretty complete so you may want to look there: http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp2e-part2.html
22:00 asumu: As jrslepak_ suggested, this is a straightforward application of the recipe in section 4.2.
22:01 asumu: Also try writing examples to see why your function fails right now.
22:04 failing: all righty, will get back to you guys when i solve this, ty for the help
22:07 jrslepak_ probably shouldn't stay up too much longer
22:13 asumu: jrslepak_: Oh right, you're in VA eh?
22:13 jrslepak_: aye
22:14 failing: ok, so i wrote a function that i thought would work, but now Im getting a error:    cond: expected a clause with a question and an answer, but found a clause with 3 parts
22:14 jrslepak_: syntax error
22:14 jrslepak_: look at your indiviual cond clauses
22:15 failing: should i post it so you guys can see?
22:15 jrslepak_: not yet
22:15 jrslepak_: you need to look at the cond clauses you wrote
22:16 failing: ok, so what i did was put in a cond, so if the list is empty, it returns empty, and then i added an (else (string-append "accio"
22:17 failing: but i cant find the syntax error
22:17 failing: dosent the "empty?" count as the question?
22:17 jrslepak_: how many parts does your first cond clause have? (count them)
22:20 failing: ummm 1... i think, its (cond [(empty? los) empty]
22:20 jrslepak_: that's not a cond clause
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22:20 jrslepak_: the first cond clause you wrote is [(empty? los) empty]
22:21 failing: ok, so thats 1 right?
22:21 jrslepak_: that's 1 what?
22:21 jrslepak_: 1 clause, yes
22:21 failing: one clause, two parts
22:21 failing: ?
22:21 jrslepak_: yes
22:21 failing: ok
22:22 jrslepak_: you understand what the two parts are?
22:22 failing: yea [(empty? los) and empty] right?
22:22 jrslepak_: just (empty? los) and empty
22:22 jrslepak_: the brackets aren't part of the parts
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22:23 failing: ok
22:23 jrslepak_: (and the (empty? los) part itself has two parts)
22:23 jrslepak_: now, count the parts in your next clause
22:25 failing: two, i think its [else  (string-append "accio " (first los))    (add-accio (rest los), so the parts would be:  (string-append "accio " (first los)) and (add-accio (rest los)?
22:26 jrslepak_: that wasn't the entire cond clause
22:26 jrslepak_: you have no matching ']'
22:26 failing: oh, sorry, its : [else          (string-append "accio " (first los))                (add-accio (rest los))]))
22:26 jrslepak_: ok, now count the parts
22:27 failing: wouldnt i be 2?
22:27 jrslepak_: I count 3
22:27 failing: or is the else another part?
22:27 jrslepak_: it is
22:27 failing: i see
22:27 jrslepak_: the first part of a cond clause just says under what conditions that clause gets used
22:28 failing: ok
22:28 jrslepak_: your (string-append ...) and (add-accio ...) are two separate things
22:28 jrslepak_: you need to make them into one thing
22:29 failing: how?
22:29 failing: helper function?
22:29 jrslepak_: what kind of thing are you trying to make them into?
22:30 failing: what do you mean "thing"?
22:31 jrslepak_: alternatively, "what kind of data are you trying to produce?"
22:31 jrslepak_: (e.g. "accio " is a string)
22:31 failing: so a list of strings?
22:31 jrslepak_: ok
22:31 jrslepak_: what kind of data is your (string-append ...)?
22:33 failing: i dont understand
22:33 jrslepak_: when you call the string-append function, you get some data back, right?
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22:33 failing: ohhh
22:33 failing: yea
22:34 failing: a string
22:34 failing: just with accio added to it
22:34 jrslepak_: and what kind of data is your (add-accio ...)?
22:34 failing: its a list of strings
22:34 rudybot: 
ACTION yawns, stretches, and sharpens his claws on the carpet
22:35 jrslepak_: so you have a string and a list of strings
22:35 failing: so what youre saying is i need to turn that string from string-append, into a list of strings somehow?
22:35 jrslepak_: no
22:35 failing: :(
22:35 jrslepak_: you have to turn that string from string-append and that list of strings from add-accio into a list of strings
22:35 failing: oh ok
22:36 failing: i dont know how i could do that though
22:36 jrslepak_: so what do you use to make a list of X from an X and another list of X?
22:37 offby1: a stapler
22:37 failing: no idea, a "cons"?
22:37 jrslepak_: yes, that's exactly what cons is for
22:39 failing: so i would need to add cons to my second cond clause?
22:39 failing: somewhere in there
22:39 jrslepak_: mmhmm
22:39 jrslepak_: not just "somewhere in there"
22:39 jrslepak_: you should know enough to see where
22:40 jrslepak_: (if you understand how to use cons in general; if not, you've really skipped over something important on your way to writing code for processing lists)
22:40 asumu: (hint: try some examples of using cons to build lists)
22:41 failing: oh god, im thinking lol
22:41 jrslepak_: thinking? something important has been missed
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22:42 ghs: sorry. I have a quick question, when do you use cons versus list abreviations?
22:42 failing: well, i know how cons works, its regression im having trouble with
22:43 failing: i mean recursion...
22:43 jrslepak_: failing: you have a string and a list of strings that you want to put together -- if you know how cons works, there is no more thinking needed
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22:44 failing: omg, i got it
22:44 failing: YAY
22:44 jrslepak_: tested it?
22:45 failing: yea
22:45 jrslepak_: good
22:45 failing: thanks alot
22:45 failing: seriously
22:45 jrslepak_: bedtime for me, then
22:45 failing: g night sir
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22:55 asumu: ghs: cons is more general than list abbreviations.
22:56 asumu: For example, you can't attach a number to a list of numbers with "list" alone.
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23:19 failing: asumu you still there? need some more help if youre up for it ;)
23:23 asumu: I am still here.
23:24 failing: sweet, ty ok, heres the problem
23:24 failing: i need to desing a function that gets a list of rectangles, and adds all of the areas, returns a number
23:25 asumu: Okay, what part do you need help with?
23:25 failing: i think i have a pretty god function right now, i designed a helper function that does the calculation of areas, while the main function uses recursion to add them up
23:26 failing: the question is, if rectangle is sometihng like: (rectangle 10 20 "solid" "red")
23:26 failing: how do i tell the helper function to grab the first two parameters (the numbers) to multiply them together
23:27 failing: when the multiplication tries to run an error pops up:  *: expects a number as 1st argument, given an image
23:28 asumu: Yes, the error is saying you gave it an image instead of a number. You want something that takes an image and produces a number.
23:28 asumu: Are you using 2htdp/image or the image teachpack?
23:29 failing: (require 2htdp/image)
23:29 asumu: You may find the function you want here: http://pre.racket-lang.org/docs/html/teachpack/2htdpimage.html
23:30 asumu: Oh, sorry you want this link: http://doc.racket-lang.org/teachpack/2htdpimage.html
23:30 asumu: Note that you can't directly extract the parameters from a rectangle, because "rectangle" produces an image.
23:31 asumu: Not something like a structure that has accessors.
23:32 failing: i see, so would i need to create a structure for rectangle?
23:33 asumu: No, probably not. If that last thing I said was confusing, ignore it.
23:33 asumu: (rectangle 10 20 "solid" "red") produces an image.
23:33 asumu: So assuming that the list you have is a list of images, you want to find some way to calculate image width and height.
23:34 asumu: You ought to be able to find such functions in the teachpack documentation I linked.
23:35 failing: ok, thnx alot dude, it will have to wait till tomorrow cuz im gonna go to bed
23:35 failing: so again, a thousand thanks and gnight
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