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02:51 samth: danl-ndi, here's a slightly more concise version of dyoo's code: https://gist.github.com/4681119
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03:23 Sct: Hello
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06:45 moofy: um, hello. anyone around?
07:01 eli: No.
07:01 bremner: me neither
07:02 bremner: but maybe ask a question anyway?
07:02 eli: May the spirits answer.
07:02 moofy: I'm trying to go through the racket tutorial but I can't work out how to do an exercise
07:03 moofy: which is to insert a character into a string at a specific point
07:03 eli: Have you tried turning it off an on?
07:03 moofy: so "helloworld" becomes "hello world"
07:03 moofy: I have.
07:03 moofy: I also dipped the plug into beer to cheer it up.
07:03 eli: OK then.
07:04 eli: (A pointer to the exercise would help)
07:04 moofy: http://www.ccs.neu.edu/home/matthias/HtDP2e/part_one.html#(counter._(exercise._arith-s1))
07:05 eli: Ah, that's not the Racket tutorial, it's HtDP.
07:05 moofy: but it is A racket tutorial right
07:05 noelw: Well, close enough
07:05 noelw: :)
07:05 eli: No.  It's a textbook about programming.
07:05 moofy: I would probably equate the two but what do i know
07:06 eli: For a more tutorial-ish thing, see http://docs.racket-lang.org/quick/
07:06 eli: Or http://docs.racket-lang.org/more/ for a more system like thing.
07:06 eli: Or http://docs.racket-lang.org/guide/ for a more thorough text.
07:07 eli: In any case, did you go through the text?
07:07 eli: You'll need things like `substring', `string-length', and `string-append'.
07:08 moofy: yeah but not all of it makes sense.
07:08 moofy: this is the problem of not having a teacher :/
07:08 moofy: but thanks i'll try the racket site ones
07:09 eli: rudybot: (define foo "blahblah")
07:09 eli: rudybot: (substring foo 0 4)
07:09 eli: rudybot: wake up!
07:09 rudybot: eli: your sandbox is ready
07:09 rudybot: eli: Done.
07:09 rudybot: eli: ; Value: "blah"
07:09 rudybot: eli: Uh, should I be worried that the message "Wake up, Neo..." just appeared in my minibuffer?
07:09 eli: rudybot: (substring foo 4)
07:09 rudybot: eli: ; Value: "blah"
07:11 eli: rudybot: (string-append (substring foo 0 4) "—" (substring foo 4))
07:11 rudybot: eli: ; Value: "blah—blah"
07:12 eli: moofy: ^
07:13 moofy: right
07:13 moofy: makes sense
07:14 moofy: I rarely get far with coding. I tend to get frustrated by not being able to do anything that seems useful at all
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07:16 noelw: Nothing worth doing is easy. Stick with it.
07:17 asvil: hi all, I try to install disassemble as wrote in README `raco pkg install disassemble', but it does not work
07:17 asvil: What command should I use?
07:18 moofy: true true.
07:19 moofy: Eventually my plan at the moment is to make some form of simple blog for myself with racket
07:19 moofy: so i can write something in markup and have it turn it into something readable
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07:23 eli: moofy: http://docs.racket-lang.org/continue/ for web server stuffs
07:32 noelw: asvil: what error do you see?
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07:36 moofy: yeah i started looking at that eli
07:40 asvil: noelw, /usr/bin/raco: Unrecognized command: pkg
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08:39 asumu: asvil: what Racket version?
08:40 asumu: raco pkg is only available in the pre-release versions for 5.3.2
08:40 asumu: (until 5.3.2 is released, which should be RSN)
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08:47 asvil: asumu: racket 5.3.1 from archlinux
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08:52 asumu: Yeah, I don't think that will have the pkg command.
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08:59 asvil: a little bit unfriendly interface `raco planet install: expects <owner> <pkg> <maj> <min> on the command line, given 0 arguments'
09:03 soegaard: asvil: planet2 is simpler. raco pkg install <pkg>
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09:33 asvil: jitted code with "geiser repl" is not equal jitted code with "racket built-in repl"
09:35 bremner: asvil: that's probably a bug in geiser. jao is happy to get bug reports.
09:36 asvil: bremner: is it possible to control jit at runtime?
09:36 bremner: I don't know.
09:37 bremner: asvil: you might have to ask on dev list.
09:39 asvil: I will try
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10:31 greghendershott: asvil: There's a parameter `eval-jit-enabled`. http://doc.racket-lang.org/reference/eval.html#%28def._%28%28quote._~23~25kernel%29._eval-jit-enabled%29%29
10:31 rudybot: http://tinyurl.com/bf5wyrg
10:33 asvil: greghendershott: returns #t in both
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10:37 greghendershott: asvil: OK. I don't know about "different kinds of JIT" and how Geiser might affect JIT.  Maybe some other factor WRT Geiser. AFAIK JIT per se is just on/off, and that parameter is the only runtime control.
10:39 asvil: greghendershott: Probably, I had wrote to geiser mail list.
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11:58 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/GPx6_A
11:58 RacketCommitBot: racket/master a3cde5f Robby Findler: adjust check syntax so it highlights all identifiers with the same...
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12:23 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/gQ4bVA
12:23 RacketCommitBot: racket/master 74c97cf Robby Findler: Rackety
12:23 RacketCommitBot: racket/master 9d10a33 Robby Findler: make the online check syntax error message font...
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12:56 RacketCommitBot: [racket] plt pushed 1 new commit to release: http://git.io/kDSwAw
12:56 RacketCommitBot: racket/release a643e1e Sam Tobin-Hochstadt: Switch to `pkg.racket-lang.org`....
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13:27 tbelaire: I've got a question about racket hashtables
13:27 tbelaire: http://stackoverflow.com/q/14632251/258065
13:27 tbelaire: Is there a map function?
13:28 stamourv: tbelaire: You can use `for/hash:'.
13:28 asumu: rudybot: (for/hash ([(k v) (in-hash #hash(("foo" . 2) ("bar" . 4)))]) (values k (add1 v)))
13:28 rudybot: asumu: your sandbox is ready
13:28 rudybot: asumu: ; Value: #hash(("bar" . 5) ("foo" . 3))
13:29 asumu: stamourv beat me to it. :p
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13:36 tbelaire: Does that work with immutable hashes too?
13:38 stamourv: tbelaire: It should.
13:38 stamourv: `for/hash' creates a new hash.
13:41 jrslepak: if in a match with (=> id) the `id' gets invoked, will other ways the val-expr could match the pattern be tried next?
13:42 tbelaire: I'll try it out, thanks
13:42 stamourv: jrslepak: Yes, the point of `(=> id)' is to go back to trying other patterns.
13:42 jrslepak: stamourv: no, I mean the same pattern
13:43 tbelaire: I still think that it should have a map function too
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13:43 RacketCommitBot: [racket] plt pushed 1 new commit to release: http://git.io/WA2AaA
13:43 RacketCommitBot: racket/release bd6bb38 Eli Barzilay: Update version number for the v5.3.2 release
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13:44 jrslepak: stamourv: e.g. a list could match (x ... y z ...) in several ways, but maybe only some of those ways will lead to calling the failure procedure
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13:45 stamourv: tbelaire: There's `hash-map', but it returns a list.
13:45 asumu: stamourv: pretty weird behavior, honestly.
13:46 stamourv: I have a prototype for "buildable sequences" that would solve this, but it's not yet polished enough to ship.
13:46 stamourv: tbelaire: It's on my github, if you're interested. It uses Racket's generic functions.
13:46 stamourv: jrslepak: I don't think so.
13:47 asumu: jrslepak: does that pattern ever generate multiple matches? It should be unique.
13:47 asumu: Or rather, is that a valid match pattern?
13:47 stamourv: jrslepak: Looks like trying to encode your search as pattern matching may not be the easiest way to do it.
13:48 jrslepak: oh well
13:48 jrslepak apparently doesn't have to be away from redex for long to miss its pattern matching :-P
13:52 stamourv: jrslepak: You can break that down into 2 nested `match'. The outer one matches generously, then the inner one has one pattern per "way to match", and you jump out of the outer one if nothing in the inner one matches.
13:53 jrslepak: the number of ways to match would be equal to the (dynamically determined) length of the list
13:53 stamourv: Sounds like something you may want to write an actual function for.
13:53 asumu: Having multiple ... is not valid in `match`, I think.
13:53 asumu: Though I could be wrong.
13:54 stamourv: And then use that in the match pattern.
13:54 jrslepak: this will probably be more straightforward with for/something
13:54 asumu wanted a for/string the other day :p
13:55 jrslepak: there's a char list -> string function somewhere, right?
13:55 asumu: list->string
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14:07 dyoo: asumu: for/string?  https://gist.github.com/4685464
14:09 asumu: Oh nice. :)
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14:15 RacketCommitBot: [racket] plt pushed 1 new commit to release: http://git.io/ByDvdQ
14:15 RacketCommitBot: racket/release c993255 Eli Barzilay: New Racket version 5.3.2.
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14:15 dyoo: woohoo
14:15 didi`: Yay.
14:42 dyoo: asumu: by the way, I snuck in that joke we made a few weeks ago: http://pre.racket-lang.org/docs/html/reference/strings.html#%28def._%28%28quote._~23~25kernel%29._string-copy%29%29
14:42 rudybot: http://tinyurl.com/a26tdxf
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14:56 asumu: dyoo: Hahah, very nice.
14:57 dyoo: it had to be done
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16:06 ozzloy: are there plans to make a (port->string input-port) like there's a (file->string filename) ?
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16:07 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/bAp64Q
16:07 RacketCommitBot: racket/master 219f9dc Robby Findler: fix close paren correction code
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16:27 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/8bYTOw
16:27 RacketCommitBot: racket/master 74a0252 Danny Yoo: Fix typo.
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16:28 dyoo: ozzloy: isn't there already one?  http://docs.racket-lang.org/reference/port-lib.html#(def._((lib._racket/port..rkt)._port-~3estring))
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17:09 ozzloy: dyoo, weird, i could swear i searched for that already and came up empty
17:09 ozzloy: dyoo, thanks!
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17:22 dyoo: ozzloy: no problem.  By the way, if you have time, try retracing how you did search,  and let us know if it still fails or if it was a simple typo.
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18:25 kristofer: hey ya'll I'm new to racket and I'm working through continue: web applications in racket. I'm running the application, it says the server is available at localhost:54826, but I don't get a response to requests
18:25 kristofer: I stop the app and start again and get a different port, but still no response
18:27 didi`: kristofer: You mean, nothing happens when you enter `http://localhost:54826' at the browser's address bar?
18:27 kristofer: didi`: exactly
18:27 kristofer: server not found
18:27 didi`: kristofer: Hum. Can't you paste your code somewhere we can look at?
18:28 kristofer: http://docs.racket-lang.org/continue/
18:28 kristofer: it's literally the code from section 1 getting started
18:29 didi`: kristofer: Try something like `http://localhost:35494/servlets/standalone.rkt'.
18:29 didi`: kristofer: But with the right port.
18:30 didi`: kristofer: May I note that the browser opens up automatically here.
18:30 chandler: kristofer: what kind of system are you running this on?
18:30 kristofer: hmm crazy. I saved the file in drracket and then ran it and it is running now
18:30 kristofer: ubuntu
18:31 didi`: kristofer: Oh well, I'm running it from the terminal.
18:32 kristofer: thank you :)
18:32 kristofer: I'm sure I'll have some more n00b questions soon
18:33 kristofer: ah I'm really an idiot here
18:33 kristofer: my browser is still configured to use a proxy
18:34 kristofer facepalm
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18:38 dyoo: kristofer: I don't think you're crazy.   I've noticed that every so often, when Racket is supposed to automatically open the web browser, sometimes the browser doesn't go to the right location.  Looking to see if it's already been bug-submitted...
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18:39 dyoo: ah, ok.  :)
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18:41 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/zXAhMg
18:41 RacketCommitBot: racket/master 6f99bfb Matthew Flatt: More: clarify how to use DrRacket instead of plain `racket'
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18:50 gf3: Is the Racket logo available anywhere?
18:50 gf3: In some sort of vector format, preferably
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18:51 errstr: it appears that the common CFG for balanced parens causes racket/lexer to blow up. here is an example: http://dpaste.org/FGB30/
18:51 errstr: is there a way around this, or am I approaching it the wrong way?
18:52 jonrafkind: gf3, collects/icons
18:52 jonrafkind: i forget which one exactly but one of the variants of plt-logo-red-diffuse.png
18:52 jonrafkind: no svg's though
18:52 gf3: Aww
18:53 jonrafkind: im not sure how they were made, probably with povray or some other renderer
18:53 gf3: Haha
18:53 gf3: Sounds like… overkill
18:55 dyoo: gf3: http://docs.racket-lang.org/images/Logos.html
18:56 gf3: dyoo: Interesting
18:56 gf3: dyoo: I notice that logo isn't used anywhere?
18:57 Nisstyre-laptop: errstr: "blow up" ?
18:57 errstr: like, it takes all of my cpu and starts to eat up ram
18:57 errstr: if you run my example, it should for you, too
18:58 Nisstyre-laptop: well I've never used Racket's parsing tools
18:58 dyoo: a traditional lexer can not balance parens.  You need something stronger than regexps to do that.
18:58 dyoo: wait, looking more closely at your dpaste.
18:58 dyoo: this can't possibly work, right?  Checking...
18:59 errstr: that's the CFG definition of balanced parens, figured that the lexer lived in the CFG realm not the Regular realm
18:59 dyoo: ok, looks like a bug in the lexer compiler.
18:59 Nisstyre-laptop: dyoo: I'm fairly sure a CFG can match nested parentheses
18:59 dyoo: It's getting stuck at compile time.  It's not even getting past compilation.  This should be filed as a bug.
19:00 errstr: it looks like racket is using derivatives, perhaps it is exponential blow-up in the derivative?
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19:00 dyoo: CFGs can.  But lex is not a CFG specification language
19:00 errstr: and it isn't getting caught
19:00 Nisstyre-laptop: dyoo: oh okay
19:00 dyoo: More than that. It's getting into an infinite loop.
19:00 dyoo: :)
19:00 Nisstyre-laptop: that was my guess
19:00 Nisstyre-laptop: it's undecideable for some reason I suppose
19:00 dyoo: Give me a sec: let me at least send the right bug report for this.
19:01 dyoo: but errstr: with regards to nested parens: use parser-tools/yacc.  Alternatively, take a look at ragg: http://hashcollision.org/ragg
19:01 dyoo: You need CFG power to do nested parens, and yacc or ragg will do it for you
19:01 errstr: ok, thank you
19:01 errstr: i thought lexer was CFG-powered :) my bad
19:01 Nisstyre-laptop: dyoo: on another note, I saw a paper recently arguing that English is context-free
19:01 dyoo: errstr: I want to add your name to attribution of the bug report
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19:02 dyoo: Is that ok, or should I just refer to you as errstr?
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19:06 asumu: gf3: http://www.eecs.northwestern.edu/~robby/logos/ <-- SVG logos
19:07 asumu: (see v4.3-present)
19:07 gf3: asumu: Excellent, thank you
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19:15 dyoo: gf3: by the way, jon wasn't joking about the raytracing comment.  https://github.com/plt/racket/blob/master/collects/images/private/deep-flomap-render.rkt
19:15 rudybot: http://tinyurl.com/bj9cw5j
19:15 gf3: dyoo: Haha wow
19:15 dyoo: I think that's the fundamental reason why neil toronto worked on http://docs.racket-lang.org/images/flomap_title.html
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20:27 ozzloy: https://gist.github.com/4688385 why does line 90 give the error at the bottom?
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20:34 ozzloy: oh, nm, i think i got it
20:36 ozzloy: yeah, wasn't matching the implicitly added newline
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22:11 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/gBwxWA
22:11 RacketCommitBot: racket/master 8aadc03 Robby Findler: more close paren adjustment repairs
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22:56 RacketCommitBot: [racket] plt pushed 1 new commit to release: http://git.io/MDt7Zg
22:56 RacketCommitBot: racket/release df147de Eli Barzilay: v5.3.2 installers info...
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23:02 RacketCommitBot: [racket] plt deleted release at df147de: http://git.io/XBrqwQ
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23:03 RacketCommitBot: [racket] plt tagged v5.3.2 at 6937f95: http://git.io/MvNHMQ
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23:04 RacketCommitBot: [racket] plt pushed 71 new commits to stable: http://git.io/OWPlPg
23:04 RacketCommitBot: racket/stable b335a3d Ryan Culpepper: Alpha version number for the v5.3.2 release
23:04 RacketCommitBot: racket/stable 1a9d203 Eli Barzilay: New Racket version 5.3.1.900.
23:04 RacketCommitBot: racket/stable 91bcf2a Robby Findler: adjust drracket so check syntax can add its preferences itself...
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23:46 asumu: Woo, release.
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23:47 lewis1711: are the new math functions documented yet? I'm trembling with anticipation
23:50 asumu: lewis1711: http://docs.racket-lang.org/math/index.html :)
23:51 lewis1711: oh. I was looking at math/base  :/
23:51 asumu: Oh hah, I didn't know it had a "Stuff that doesn't belong anywhere else" section.
23:51 asumu thinks that was added since the last time he read through those docs
23:51 lewis1711: http://docs.racket-lang.org/math/number-theory.html#%28part._combinatorics%29 omg
23:51 rudybot: http://tinyurl.com/awcau85
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23:54 eli: asumu: What's that joke?
23:55 lewis1711: wow this maths library is huge
23:55 lewis1711: almost makes me wish i hadn't dropped out of maths. almost
23:57 lewis1711: anyway better get back to work. but great job everyone
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23:59 asumu: eli: ?
23:59 asumu: If you mean the section title, I was just amused that it was so literal.