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01:06 offby1: joeshmo: "find", probably
01:06 offby1: rudybot: doc find
01:06 rudybot: *offby1: no docs for a current binding, but provided by: unstable/find, srfi/1, rnrs/lists-6
01:06 offby1: rudybot: (require srfi/1)
01:06 rudybot: *offby1: Done.
01:06 offby1: rudybot: doc find
01:06 rudybot: *offby1: http://docs.plt-scheme.org/srfi-std/srfi-1.html#find
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04:33 Prometheus_: rudybot: (string->list "a")
04:33 rudybot: Prometheus_: ; Value: (#\a)
04:33 Prometheus_: why does that function add the '#/' before the character
04:33 Prometheus_: I need it to be just the char :\
04:33 Prometheus_: rudybot: (string->list "abc")
04:33 rudybot: Prometheus_: ; Value: (#\a #\b #\c)
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04:47 Prometheus_: ahh I see how this works
04:47 Prometheus_: :)
04:48 Prometheus_: rudybot: (string #\a #\space #\ 'space)
04:48 rudybot: Prometheus_: error: string: expects type <character> as 4th argument, given: space; other arguments were: #\a #\space #\space
04:48 Prometheus_: member:rudybot: (string #\a #\space #\ space)
04:48 Prometheus_: rudybot: (string #\a #\space #\ 'space)
04:48 rudybot: Prometheus_: error: string: expects type <character> as 4th argument, given: space; other arguments were: #\a #\space #\space
04:49 Prometheus_: rudybot: (string #\a #\space #\space)
04:49 rudybot: Prometheus_: ; Value: "a  "
04:49 Prometheus_: member:rudybot: (string #\a #\space space)
04:50 Prometheus_: rudybot: (string #\a #\space space)
04:50 rudybot: Prometheus_: error: reference to undefined identifier: space
04:50 (quit) Prometheus_: Quit: Prometheus_
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09:34 rapacity: is there a built-in function for checking file equality ?
09:37 Lajla: rapacity, defie 'file equality'
09:37 rapacity: err all the bytes in a file
09:37 Lajla: Ah, so its path shouldn't?
09:37 rapacity: being equal to another
09:37 rapacity: the file can have a different path
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09:43 rapacity: and another question, I wrote a couple of functions for checking if the bytes in 2 files are equal one uses read-byte and compares the bytes stopping where there's a difference, the other hashes using sha1 and compares the hashes
09:43 rapacity: the read-byte one was 23x slower
09:44 rapacity: I would've thought that using a hash function would take more computation
09:44 rapacity: http://pastey.net/144952-23fs
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10:23 Lajla: rapacity, so, only the contents
10:23 Lajla: not the title, creation time, last update time, priveledges ad all that fancy stuff?
10:32 rapacity: only the contents
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11:34 offby1: rapacity: I'd have thought so, too.
11:34 Sam___: Can someone write me a function what can calculate a cross product ?
11:34 offby1: rapacity: perhaps your reading isn't buffered, but sha1 properly buffers
11:35 offby1: Sam___: https://gist.github.com/781926
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11:38 Sam___: thx
11:46 askhader: Where can I find the latest on racket development for the Android `os` ?
11:51 bremner: fwiw, I have never heard of such an effort.
11:52 bremner: racket doesn't use the JVM, which might put a wrench in things.
11:52 askhader: Interesting. Perhaps it was for scheme then..
11:53 bremner: there are various scheme-like things on JVM.
11:53 rapacity: perhaps you were thinking of moby ?
11:54 rapacity: http://planet.racket-lang.org/package-source/dyoo/moby.plt/3/9/planet-docs/manual/index.html
11:54 rudybot: http://tinyurl.com/4c2786p
11:54 bremner: ah, that sounds plausible.
11:57 askhader: Yeah that's what I was thinking of, thank you sir.
12:01 rapacity: offby1: I think the buffering is on, because when I set file-stream-buffer-mode to 'none it becomes 135x slower
12:04 offby1: ow
12:05 offby1: well, I don't understand what's going on, but I bet you'll speed things up if you first compare the files' _sizes_, and only start comparing their actual _bytes_ if the sizes are equal.
12:06 offby1: you could run both your program, and the sha1 program, under 'strace', and see what they're doing differently at a low level.
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12:07 rapacity: yeah I'm doing that, I think you were right about the buffer thing, I loaded the whole file to memory and that speeded up the whole thing
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12:09 rapacity: ok now I'm doing (bytes=? (port->bytes port-1) (port->bytes port-2))
12:10 rapacity: now it's 1.5x faster than the sha1 :p
12:10 rapacity: yay
12:12 offby1: that was easy
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12:13 rapacity: though for some reason it hops between being 3x slower and 1.5x faster :p than the sha1
12:13 rapacity: while the sha1 is consistent in performance
12:16 bremner: rapacity: are you garbage collecting?
12:19 rapacity: I wasn't
12:19 rapacity: ah the gc is adding all the time
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16:13 mithos28: Does anyone know what is supposed to happen if the error escape handler doesn't actually escape but tries to return a value?
16:15 mithos28: In DrRacket I get a hang, and in racket i get a message and then the process dies with an error code of 1
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16:35 dunkel^: hi
16:35 dunkel^: got a quick question
16:36 dunkel^: is there something like curry, but not to bind the first parameters but a certain one (second of two in this case)
16:38 offby1: not that I know of.
16:38 offby1: I suspect you can mix and match "curry" with "curryr" to get what you want
16:38 offby1: but after a certain point, it's probably clearer to just write a plain lambda expression
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16:57 dunkel^: curryr might just be what I want
16:57 dunkel^: didn't know about that one
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17:00 offby1: rudybot: ((curry cons 2) 'frotz)
17:00 rudybot: *offby1: ; Value: (2 . frotz)
17:00 offby1: rudybot: ((curryr cons 2) 'frotz)
17:00 rudybot: *offby1: ; Value: (frotz . 2)
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17:26 rapacity: there's also cut
17:26 rapacity: from srfi/26
17:27 rapacity: rudybot: (require srfi/26/cut)
17:27 rudybot: rapacity: your sandbox is ready
17:27 rudybot: rapacity: Done.
17:28 rapacity: rudybot: ((cut cons <> 2) 1)
17:28 rudybot: rapacity: ; Value: (1 . 2)
17:34 offby1: I abandoned "cut" once I learned about curry
17:34 fds: There has to be a cookery joke in there somewhere!
17:39 Lajla: rudybot, (eqv? (compose) values)
17:39 rudybot: Lajla: your sandbox is ready
17:39 rudybot: Lajla: ; Value: #t
17:39 Lajla: offby1, see
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17:48 offby1: Lajla: didn't that break the bot last time you tried?
17:48 offby1: fds: I know, I searched for one for a while, but then gave up
17:48 offby1: rudybot: (eq? (compose) values)
17:48 rudybot: *offby1: ; Value: #t
17:48 offby1: *shrug*
17:48 offby1: phase of the moon, I guess
17:50 fds: offby1: Indeed, it's harder than it looks.
17:52 Lajla: offby1, see
17:52 Lajla: it works
17:52 Lajla: I tolld you
17:52 Lajla: rudybot: (compose)
17:52 rudybot: Lajla: ; Value: #<procedure:values>
17:52 Lajla: rudybot, is the values procedure simply an n-ary identity function?
17:52 rudybot: Lajla: I was referring to n-ary EXPT.
17:54 offby1: rudybot: you want fries with that?
17:54 rudybot: *offby1: right, french fries and "home made" mayo at the dutch pub is pretty nice
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19:33 meltingwax: is there a preferred procedure i can use to hash passwords, say for storing in a database?
19:33 offby1: there's a planet package for HMAC-SHA1; that's probably the right thing
19:33 offby1: I think you'd generate a "salt", and store that along with the hash
19:34 meltingwax: offby1: cool, thanks!
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21:14 PLT_Notify: racket: master Matthew Flatt * 090f82c (1 files in 1 dirs): fix `codeblock' interaction with reader macros ...
21:14 PLT_Notify: racket: master Matthew Flatt * 21eee45 (3 files in 3 dirs): fix `read-language' when input has only comments
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21:14 PLT_Notify: racket: master commits b1e13e7...c8e3d45 - http://bit.ly/eS5SOz
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21:20 gcr: Hey there! Is there a way to convert a string into a Basic Latin string? E.g. (string-utf8->string-basic-latin "Ångström") => "Angstrom"
21:21 gcr: or just characters?
21:21 offby1: I think you'd convert bytes-utf8->string, then string->bytes-latin
21:21 offby1: not that those are actual procedures
21:21 offby1: but the conversion lets you specify an encoding, I'm pretty sure.
21:21 offby1: oooh wait
21:22 offby1: you're talking about converting one character into another that is somehow similar
21:22 offby1: i.e., Å => A
21:22 offby1: no idea how to do that
21:22 offby1: not even sure it's possible
21:22 gcr: Hm, alright.
21:23 offby1: you might need to build a giant map
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21:24 gcr: Oh. Ew. Instead, is there an easy way of telling whether my string contains such non-latin characters?
21:25 gcr: e.g. (= (string-length string) (bytes-length (string->bytes string))) probably wouldn't be what I want for values between 128 and 255, but close
21:26 gcr: anything better than (not (regexp-match? #rx"[^a-zA-Z]" string))
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21:27 offby1: here's a crude way to do it (something like this might already be built-in; I dunno):
21:27 offby1: here's a crude way to do it (something like this might already be built-in; I dunno): https://gist.github.com/782407
21:28 gcr: Oh! Clever.
21:28 offby1: I dunno that my way is any better than yours, though
21:28 gcr: meh... blame Scrabble for not including an Å tile
21:29 gcr: Many thanks
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21:55 aw_: Is there a version of copy-files that won't throw an exception if the target already exists?
21:56 aw_: ...I mean copy-file (singular)
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