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01:22 RacketCommitBot: [racket] plt pushed 3 new commits to master: http://git.io/IM1NoA
01:22 RacketCommitBot: [racket/master] macro-debugger: fix deriv parser for begin-for-syntax - Ryan Culpepper
01:22 RacketCommitBot: [racket/master] macro-debugger: improve internal error debugging support - Ryan Culpepper
01:22 RacketCommitBot: [racket/master] macro-debugger: workaround for instrumentation problem in provide - Ryan Culpepper
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05:30 lewis1711: http://rosettacode.org/wiki/Power_set#Racket if anyone can do a nicer job, please edit, I would not misrepresent this fine language :)
05:31 lewis1711: (or I will edit for you if you don't have an account)
05:36 mrcarrot: while i have not learned any racket or scheme yet, to me the Scheme solution seems to be more simple...
05:38 lewis1711: mrcarrot: scheme version works on lists, not sets. it would probably work in racket though
05:39 mrcarrot: okay
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05:42 mrcarrot: interesting that haskell has a ready function for this: subsequences from Data.List
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05:53 lewis1711: yes haskell does have a lot of useful predefined functions
05:53 lewis1711: many of which are trivial, but none the less handy
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08:22 fasta_: When I open a certain file and press 'debug' on it, drracket uses 100% CPU and becomes completely unusable. Is drracket meant as some inside joke?
08:22 fasta_: It is a an extremely simple script (perhaps 100 lines or so).
08:23 fasta_: Then if I press C-c, I get an 'internal error' (user break).
08:23 fasta_: It is not an internal error, it is exactly what I asked for.
08:23 fasta_: Then I get a few contracts that are broken (so more bugs in the program).
08:24 fasta_: Again, is drracket meant as some kind of bad joke or is it only meant to get more research funding to give the illusion that you are creating something?
08:25 bremner: hey, way to open with hostility.
08:27 fasta_: I think I have tested it for the past 5 years or so and I have seen zero improvement.
08:27 fasta_: It might be that the internals have been optimized by 50%, but the GUI is still as bad (or worse) as ever.
08:28 fasta_: The 50% is a made up number.
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08:29 fasta_: How can I set the memory limit to something more ... modern?
08:29 fasta_: I would have expected it to find it under preferences, but no.
08:32 bremner: Racket -> Limit Memory
08:38 fasta_: Even with the very latest git version it still uses 100% CPU when apparently it is not doing anything.
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08:43 fasta_: I suspect there is some algorithmic inefficieny in displaying a large number of variables.
08:43 fasta_: inefficiency
08:47 fasta_: bremner: are you saying that you use drracket?
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09:25 bremner: fasta_: well, I used it enough to find that switch.  I'm not really interested in a discussion on whether I think it is a "private joke" or not.
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09:29 mrcarrot: what is really racket-textual about? i can not find any information on the website that would tell some more
09:29 mrcarrot: is it racket without drracket gracket?
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09:31 bremner: drracket is an application running on gracket
09:32 bremner: gracket is racket + some more libraries (e.g. gtk)
09:33 mrcarrot: so what is then racket-textual?
09:33 bremner: don't know. Where do you find it?
09:34 mrcarrot: http://download.racket-lang.org/all-versions.html
09:34 chandler: racket-textual is racket without the GUI bits
09:34 bremner: oh, I never use the precompiled packages. So I suppose it's just racket, without some of the libs.
09:34 chandler: so, no drracket, no gracket, no slideshow, etc.
09:35 mrcarrot: i will have to compile and check...
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10:19 stamourv: eli: pong
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10:44 Diarmid: mrcarrot: asumu mentioned this to me yesterday http://planet.plt-scheme.org/display.ss?package=parseq.plt&owner=bzlib it might be what you're looking for
10:47 Diarmid: mrcarrot: There's documentation on the home page link.
10:48 Kaylin: (define RE? (lambda x (helpfunction (car x) 0)))
10:48 Kaylin: why does this pass the helper function the entire list that x is?  if I call for example (RE? `(l m n)) the entire list (l m n) is passed to helperfunction, I tested it many times, but I don't understand WHY (it's the behavior I want but it is confusing me)
10:49 (part) fasta_
10:49 Kaylin thinks she screwed up some parentheses somewhere.
10:54 chandler: Kaylin: Compare (lambda x x) with (lambda (x) x) .
10:54 chandler: rudybot: eval (define foo (lambda x x))
10:54 rudybot: chandler: your sandbox is ready
10:54 rudybot: chandler: Done.
10:54 chandler: rudybot: eval (foo 1 2 3)
10:54 rudybot: chandler: ; Value: (1 2 3)
10:55 chandler: rudybot: eval (foo '(1 2 3))
10:55 rudybot: chandler: ; Value: ((1 2 3))
10:55 Kaylin: ah ok, so I'm not totally crazy
10:55 Kaylin: (in this case)
10:56 Kaylin: thanks :)
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11:02 mrcarrot: Diarmid: thanks, but that was not at all what i was looking for...
11:02 Diarmid: mrcarrot: I thought you were the one looking for the parsec-like parsing library.
11:03 mrcarrot: Diarmid: no, i was looking for something similar to acid-state... which is more like a "database"
11:03 Diarmid: Oh, sorry, it was rostayob.
11:03 rostayob: Diarmid: I think that was me :)
11:03 rostayob: yes
11:03 Diarmid: Did you see the link I mentioned?
11:04 mrcarrot: hello rostayob
11:04 Diarmid: rostayob: I've decided I rather like it.
11:04 rostayob: Diarmid: parsec or the racket parsec?
11:05 Diarmid: rostayob: The link was for Parseq (q instead of c this time) for Racket.
11:05 Diarmid: rostayob:  http://planet.plt-scheme.org/display.ss?package=parseq.plt&owner=bzlib
11:06 rostayob: Diarmid: yeah I got that
11:07 Diarmid: rostayob: Combinator parsing seems to go nicely with combinator formatting, which certainly beats the tar out of Common Lisp style format strings.
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11:07 rostayob: Diarmid: I have no idea about the CL thing, but I believe you
11:09 Diarmid: rostayob: http://www.gigamonkeys.com/book/a-few-format-recipes.html  The ones near the end will give you an idea of the 'problem'.  They look sort of like regular expressions, but can have complex control flow too.  They can be... rather difficult to read.
11:11 Diarmid: rostayob: I liked the http://synthcode.com/scheme/fmt library as a alternative.  http://synthcode.com/scheme/irregex makes regular expressions quite a bit more readable to me.
11:15 rostayob: Diarmid: too many things, too little time :)
11:16 Diarmid: rostayob: I mostly end up fighting text and running command line programs, so this sort of thing ends up being important to me.
11:16 rostayob: yeah those things are often very important
11:16 rostayob: even if they look like details they take/add a lot of pain :)
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12:24 sid0: hm, strange that racket's FFI doesn't support (_list o <type> 0)
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12:28 sid0: (it should pass in null to the C function and return an empty list)
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13:33 sid0 considers submitting a pull request
13:34 stamourv: sid0: Cool, what about?
13:35 stamourv: Oh, sorry, it's obvious from scrollback.
13:35 stamourv: Yeah, that sounds cool.
13:35 stamourv: I don't know much about the FFI, but eli certainly does.
13:36 sid0: stamourv: Yeah, seems like a simple enough fix
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14:04 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/woBk3A
14:04 RacketCommitBot: [racket/master] Clarifying what #lang web-server has - Jay McCarthy
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14:21 gf3: hi gents, having an issue with the sandbox, I'm receiving the following error when trying to build a sandbox and eval some code:
14:21 gf3: file-exists?: `exists' access denied for /usr/lib/libcrypto.so
14:21 gf3: couldn't find much on the googles
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15:24 samth: gf3: probably the code you are running is using the sha1 library or something else that accesses libcrypto
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15:25 gf3: samth: I don't think it is
15:25 gf3: samth: I move my code to a different server, and suddenly I am receiving these errors
15:25 gf3: despite using the same version of racket
15:25 samth: oh, i know what's going on
15:25 samth: you probably haven't compiled some of the files
15:26 gf3: oh crap
15:26 samth: are you using drracket?
15:26 samth: b/c that tries to compile automatically
15:26 gf3 yells at sysadmin
15:26 gf3: samth: thanks I'll recompile and report back
15:26 samth: and it uses sha1 to compare files to see if they need to be compiled
15:27 gf3: samth: I am not using drracket
15:27 samth: gf3: can you submit a bug report about this -- the compiler ought not cause sandbox errors even in this case
15:27 gf3: samth: sure thing
15:28 gf3: samth: FWIW this is my sandbox → https://raw.github.com/gf3/protobot/master/sandboxed-ipc-repl.rkt
15:28 samth: i bet it's the planet package not being compiled, or some such
15:28 gf3: samth: I actually can't find the bug tracker
15:28 gf3: is it GH issues?
15:28 samth: no
15:29 samth: (but it will be soon)
15:29 samth: http://bugs.racket-lang.org/
15:33 gf3: samth: thanks, and done
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16:23 lewis1711: does anyone know how "listof" and "vectorof" are implemented for contracts? wanting to write "setof"
16:26 stamourv: rudybot: doc set/c
16:26 rudybot: stamourv: your sandbox is ready
16:26 rudybot: stamourv: http://docs.racket-lang.org/reference/sets.html#(def._((lib._racket%2Fset..rkt)._set%2Fc))
16:26 stamourv: lewis1711: ^
16:27 lewis1711: *clicks*
16:30 lewis1711: oh. thanks stamourv. wondering why it uses a different naming convention though
16:31 samth: lewis1711: the difference between list/c and listof doesn't really have a counterpart for sets
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16:57 lewis1711: I was unaware of list/c forms and the like. useful info
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16:58 lewis1711: also I have decided that racket modules with type contracts hit the sweet spot for me as far as dynamic vs safety/static goes
17:04 chandler: samth: It wouldn't be particularly efficient, but why couldn't there be a `setof' contract?
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17:24 sid0: hm, wonder why rackunit/text-ui's run-tests doesn't take multiple test suites as input but text/gui does
17:25 samth: chandler: which one are you thinking of
17:25 samth: set/c is like listof
17:26 chandler: Er, sorry. Is there any reaosn there couldn't be a set contract that acts like `list/c'?
17:26 chandler: "reason". Gah.
17:27 samth: chandler: as in, each specified element must be present?
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23:24 lewis1711: just thought of a decent use for macros - an implementation of enums
23:27 offby1: I use macros to scrape snow off my boots in winter
23:27 rudybot: ijp:
23:28 chandler: rudybot: hush, you
23:28 rudybot: chandler: you can call it browse-url-chromium, and adapt it from the other two.
23:29 lewis1711: offby1: I don't think I've read that bit of the racket reference yet
23:30 offby1: it's in "unstable/severe-weather"
23:31 lewis1711: I hope there's a typed version available so I don't get run time errors when i try and scrape off slush instead
23:32 offby1: I think slush inherits from snow
23:33 jeapostrophe: lewis1711: the ffi has enums. what do /you/ mean by enum?
23:34 lewis1711: jeapostrophe: a list of symbols I can qualify with a name
23:34 jeapostrophe: lewis1711: in like a contract...? when would you use the name?
23:35 lewis1711: so given a list '(blue green red), I could then do 'colour-red'
23:36 jeapostrophe: and get a number...?
23:36 lewis1711: sure, if that's faster to do checks on than a symbol
23:36 lewis1711: it's basically so I can use a symbol that I know "exists"
23:36 lewis1711: instead of one I am just creating on the fly
23:36 jeapostrophe: ah, i see
23:37 lewis1711: I don't know if there's a better way for it. very likely
23:40 jeapostrophe: https://github.com/jeapostrophe/exp/blob/master/enum.rkt
23:40 jeapostrophe: like that?
23:41 lewis1711: yes. is that yours jeapostrophe?
23:42 jeapostrophe: ya, i just wrote it in the four minutes between my messages
23:42 jeapostrophe: but, that's what you meant?
23:42 jeapostrophe: i think i want that sometimes too
23:47 lewis1711: I don't understand how yours work, but my attempts don't. can I steal it?
23:49 jeapostrophe: you should try to understand it
23:49 jeapostrophe: look at the macro stepper and i'm happy to answer questions
23:49 jeapostrophe: but ya, use it
23:52 lewis1711: I struggle with simple macros right now
23:54 jeapostrophe: you should read PLAI's macro chapters
23:55 lewis1711: PLAI?
23:56 jeapostrophe: http://www.cs.brown.edu/~sk/Publications/Books/ProgLangs/
23:58 lewis1711: rudybot: (define-syntax-rule (enum symbol-list) (for ([sym symbol-list] [n (in-range 0 (length symbol-list))]) (define sym n)))
23:58 rudybot: lewis1711: your sandbox is ready
23:58 rudybot: lewis1711: Done.
23:58 lewis1711: rudybot: (enum '(cat dog))
23:58 rudybot: lewis1711: error: begin (possibly implicit): no expression after a sequence of internal definitions in: ((define sym n))
23:58 lewis1711: fail :(
23:58 jeapostrophe: you should look at that in the macro stepper
23:59 jeapostrophe: that for is in the expansion so it happens at run-time, not at transform-time
23:59 jeapostrophe: in contrast, my 'for' happens at transform-time and sets up the list of identifies that is implicitly iterated over