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01:25 jonrafkind: eli, ping
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02:56 RacketCommitBot: [racket] plt pushed 6 new commits to master: https://github.com/plt/racket/compare/3441686...b78a1a8
02:56 RacketCommitBot: [racket/master] fix an error message - Matthew Flatt
02:56 RacketCommitBot: [racket/master] add `for/sum', `for/product', etc. - Matthew Flatt
02:56 RacketCommitBot: [racket/master] Racket-implemented `reverse', `member', `memv', `memq' - Matthew Flatt
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05:04 noelw: eartiveatom
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07:22 darkf: hello - is there a way to print a struct's members (e.g. I'm doing (printf "~a" object) but it only prints #<name of the struct>, I'd like it to print something like #<name x:1 y:foo>)?
07:37 ohwow_: declare a struct with #:transparent
07:38 ohwow_: rudybot: eval (struct a (b) #:transparent)
07:38 rudybot: ohwow_: your sandbox is ready
07:38 rudybot: ohwow_: Done.
07:38 ohwow_: rudybot: eval (define x (a 3))
07:38 rudybot: ohwow_: Done.
07:38 ohwow_: rudybot: eval (printf "~a" x)
07:38 rudybot: ohwow_: ; stdout: "#(struct:a 3)"
07:40 darkf: Is there a way to do that if I'm not the one defining the struct?
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08:40 RacketCommitBot: [racket] plt pushed 1 new commit to master: https://github.com/plt/racket/commit/a26eb340c86383a4dd0f387ab423de9a20a81ca0
08:40 RacketCommitBot: [racket/master] fix the parent of the 'can close this window?' messages for tabs that aren't the frontmost tab - Robby Findler
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09:13 danking: Is (length (call-with-values vs list)) the only way to get the number of values? Alternatively, is there a way to write rackunit tests which test the equality of a function which returns multiple values?
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10:29 RacketCommitBot: [racket] plt pushed 1 new commit to master: https://github.com/plt/racket/commit/e6b4d547c9c53a682b411f48af3c4393a1a6406f
10:29 RacketCommitBot: [racket/master] fix problem with initialization of tag name array - Matthew Flatt
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10:46 noelw: danking: Multiple values are not ... err ... values
10:46 noelw: That is, they don't have any representation as values in the programming language
10:47 noelw: So to turn them into values you need to do the call-with-values thing
10:47 noelw: Rackunit doesn't have any built-in support for this but you can easily write your own check
10:47 noelw: see define-check and define-simple-check
10:58 danking: noelw: My question was probably unclear. `define-simple-check' merely lets me define a custom rackunit check, it doesn't solve my real problem of how to do equality testing of mutliple values. Using `call-with-values' seemed like an indirect way to do so. Upon further consideration, I've accepted this approach.
11:00 noelw: I too was unclear. You can wrap the ugliness of call-with-values with a custom check -- that is what I was getting at but didn't actually state
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11:39 clklein: Ugh, burned again by `case' and `cond' not blowing up when no cases match.
11:40 clklein: When I wrote this code, I thought, "hrm, I know this is dangerous, but do I really want to scroll all the way up to require racket/match? Eh, what could go wrong..."
11:40 clklein: Lesson learned.
11:43 noelw: :)
11:43 Daemmerung: (else (error "Duh, forgot a clause"))
11:44 clklein: I know I can write that by hand, but whats' the point of writing it by hand every single time?
11:44 Daemmerung: sometimes you really want a case or a cond.
11:46 clklein: Then you should have to say "I don't care if this falls through."
11:46 clklein: The default should not be wrong so often.
11:47 Daemmerung: think of case and cond as generalizations of when and unless.
11:47 clklein: I'm saying that's not a helpful way to think of them.
11:48 clklein: (because that behavior is not usually helpful)
11:48 Daemmerung: works on my machine(tm).
11:49 clklein: You routinely want the fall-through behavior?
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11:56 Daemmerung: more like it's useful, and i
11:56 Daemmerung: m used to it.
11:57 clklein: Do you often make use of its usefulness?
11:59 Daemmerung: i don't even think about it any more.  cond is what it is.  i prefer the existing model to one where i'd have to write (else (no-really-im-cool-with-this)) at the end of every side-effectful cascade.
12:04 wingo: is (else) valid in racket?
12:04 wingo: it does not appear to be in r5rs
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12:18 jonrafkind: wingo, for what, cond?
12:19 wingo: jonrafkind: yes; clklein was wanting cond to error if there is no else clause, but Daemmerung was protesting it would be too verbose in the imperative case
12:20 wingo: but i just meant to lurk here, so don't mind me ;-)
12:23 Daemmerung: clklein: i don't mean to be glib, and i appreciate you challenging my assumptions borne of habit
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12:39 RacketCommitBot: [racket] plt pushed 4 new commits to release: https://github.com/plt/racket/compare/fd6e9c2...37eca34
12:39 RacketCommitBot: [racket/release] win32: fix `copy-file' handling of file-exists error - Matthew Flatt
12:39 RacketCommitBot: [racket/release] Changed error messages in test case to match corrected error messages in - Stephen Bloch
12:39 RacketCommitBot: [racket/release] Fixed an off-by-one bug in "myflip", an example for build-image.  Now it passes its tests :-) - Stephen Bloch
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12:40 clklein: Daemmerung: no problem :)
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12:46 stamourv: clklein: It should be reasonably easy to write a `cond/err' or `case/err' that errors if control falls through.
12:46 stamourv: That would fit nicely in unstable/whatever. ;)
12:47 jonrafkind: conderr? i hardly even knew her!
12:48 stamourv: Coming up with good names is a superpower I don't have, unfortunately.
12:49 jonrafkind: cond/error
12:49 Daemmerung: the schemely tradition embraces long, awkward, hyphen-studded names.  cond-with-guaranteed-guard-clause
12:50 Daemmerung: cond-with-guaranteed-return-value-or-your-money-back
12:51 JuanDaugherty: that's general lisp actually
12:52 clklein: stamourv: I wonder how much would be saved by requiring unstable/whatever over racket/match.
12:53 Daemmerung: cond/check, case/check
13:18 danking: There's always condWithGuaranteedReturnValueOrYourMoneyBack if you're sick of studly names.
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13:58 stamourv: clklein: That's not the point.
13:59 stamourv: The point would be to see whether having these at all is convenient enough for people to use.
13:59 stamourv: And if so, it may make its way in a more proeminent collect.
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14:15 RacketCommitBot: [racket] plt pushed 1 new commit to release: https://github.com/plt/racket/commit/2c5e9b9e42613ea070dbc5d1375aeebd945977f9
14:15 RacketCommitBot: [racket/release] fix problem with initialization of tag name array - Matthew Flatt
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14:27 svk_: Is there a standard stream function equivalent to "stream-head" or to "take" in Haskell? (Meaning, one to get a list/sequence/stream of the first k elements of a potentially infinite stream.)
14:31 samth: svk_, no, but you should write one for `racket/stream' and submit it as a patch :)
14:36 svk_: Oh, okay.. I assumed I just couldn't find the name
14:38 samth: svk_, racket/stream is pretty new
14:38 samth: new functions are a good idea
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14:47 jonrafkind: theres a stream-take in srfi/41
14:47 samth: jonrafkind, srfi/41 streams aren't the same as racket/stream streams, right?
14:47 svk_: This seems like a passable implementation to me, consistent with stream-tail as far as I can see: http://paste.lisp.org/display/123581
14:48 jonrafkind: right, but making the implementation should be easy if you can steal it from srfi/41 (as long as stream-take doesn't touch the internal representation too much)
14:48 samth: svk_, that looks right
14:51 samth: jonrafkind, svk_, i was wrong, just using srfi/41 should wokr
14:51 samth: *work
14:52 svk_: Oh, okay
14:56 svk_: Doesn't seem to work for me, (stream-take 10 (in-range 10 30)) -> error, stream-take: non-stream argument
14:58 samth: svk_, `in-range' produces a sequence, but not a stream
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15:25 svk_: Oh, thanks, misread that
15:28 svk_: I think I was misled by the fact that whatever it produces prints as #<stream>, I notice stream-cons streams don't
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15:33 jonrafkind: stamourv, what was the new logging you mentioned?
15:35 stamourv: jonrafkind: unstable/logging
15:36 stamourv: It's for programmatically controlling logging.
15:36 stamourv: Like capturing logging output from inside the program, or changing the output level from within the program.
15:40 stamourv: You could already do that, with log listeners and all, but it's quite complicated.
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21:00 (topic) -: Racket -- http://racket-lang.org --  logs @ http://racket-lang.org/irc-logs
21:00 (names) -: gabot joshcough rgee dnolen Sgeo_ elliottcable SethTisue littlebobby Daemmerung YokYok emma ohwow_ DT`` svk_ mario-goulart snorble tauntaun drhodes Twey samth_away stchang_ rudybot Zao cipher tomku shachaf tewk Utkarsh clklein flazz stamourv ohwow cky janne gf3 hyko stride fmu ve blomqvist dsp_ danking void- askhader _p4bl0 rapacity sir_lewk mattmight offby1 tonyg @ChanServ zakwilson
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