--- Log opened Thu Apr 07 00:00:50 2011
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01:15 < brad__> is there anyway to call bufio.ReadString directly from
fmt.Printf?  Each time I try, it complains about multiple values
01:15 < brad__> multiple values in single value context
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01:19 < hopso> I don't think so.  Just do like
01:19 < hopso> a, _ := b.ReadString('\n')
01:19 < hopso> fnt.Printf("%s", a)
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01:20 < hopso> Of course checking for errors is usually good.
01:20 < brad__> yeah, that seems to work, but kind of annoying
01:21 < hopso> It was at first but it feels natural now.
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01:22 < brad__> you would think if you were calling a multi value result in
a single value context, that it would just output the first value
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01:23 < exch> the error values is there for a good reason.  You should
really handle it
01:24 < hopso> exch is correct.  It's already handed to you so checking it
is always a good idea.
01:24 < brad__> if that were true, then go would force exceptions
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01:30 < exch> exceptions open a whole other can of worms
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01:32 < skelterjohn> makes me hungry
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01:36 < hopso> Talking about hunger...  I need coffee and a banana.
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02:45 < hopso> Does anyone know good articles about parsers/lexers?
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02:54 < jessta_> hopso: there are some really good books
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02:55 < hopso> Can't get the well known 'Dragon Book' in my hands any time
soon.
02:55 < hopso> I think there's only one of them in the local library and
it's reserved for someone else.  :/
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02:59 < uriel> hopso: you can find it online if you search properly
03:00 < hopso> uriel: Sadly I can't stand reading books on computer screen.
But thanks for the tip.
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03:04 < jessta_> hopso: but you're fine with reading articles on a computer
screen?...
03:04 < hopso> jessta_: Complete book is a whole different thing.
03:05 < hopso> And book is more comfortable to keep next to me as a
reference.
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03:14 < plexdev> http://is.gd/URvvb4 by [Russ Cox] in go/lib/codereview/ --
codereview: recognize code URL without trailing slash
03:14 < plexdev> http://is.gd/6zT1lP by [Dave Cheney] in go/src/pkg/syscall/
-- syscall: fix typo in mmap comment
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06:16 < Namegduf> Argh
06:16 < Namegduf> Why are people still talking about those moronic
"datafaces"
06:17 < Namegduf> Horribly complex and ugly and even the claimed benefits
are miniscule next to the complexity.
06:20 * Namegduf has been holding himself back from replying because it isn't nice
to reply "Your entire proposal is useless and horrible from start to end."
06:22 < nsf> why can't you just ignore it?  :)
06:23 < nsf> http://xkcd.com/386/ ?
06:23 < nsf> :)
06:23 < Namegduf> Because it's been spamming my inbox for a goddamn week
06:23 < nsf> unsubscribe
06:24 < nsf> :)
06:24 < Namegduf> At least the other stupid proposals were copying other
languages, this one is inventing their own.
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06:28 < masak> hi.  running './all.bash', I seem to get a 6l but no 6g.  I
don't seem to get an error in the make process.  what did I miss?
06:29 < fzzbt> masak: which branch are you on?
06:29 < masak> I did 'hg clone -r release https://go.googlecode.com/hg/ go'
06:32 < fzzbt> works for me
06:32 < masak> 'hg branch' says 'default'.
06:32 < masak> would a nopaste of the './all.bash' output help?
06:33 < Namegduf> nsf: It's usually got SOME interesting content
06:33 < Namegduf> Occasionally
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06:33 < nsf> is it?
06:33 < nsf> :)
06:33 < masak> ah.  in piping STDOUT to a file, I found the actual error:
'bison: not found'.
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06:34 < nsf> bison is a compiler generator, like yacc, all major linux
distros have it
06:34 < nsf> masak: what's your OS?
06:35 < masak> I'm on a very recent Ubuntu.
06:35 < nsf> then just install bison
06:35 < masak> 'apt-get install bison' worked
06:35 < nsf> good then :)
06:35 < masak> now things seem to be chugging along nicely.
06:38 < masak> yes -- it worked.  thanks for your moral support :)
06:38 < nsf> ;)
06:39 < masak> time to try out Google Go.
06:39 < masak> I'll be back.  :)
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06:40 < randfur> What is Google Go?
06:40 < nsf> where are we?  :)
06:41 < fzzbt> just some crummy board game
06:42 < randfur> Oh did he mean Google's Go?
06:43 < randfur> Thought it might've been some Google API.
06:53 < rm445_> are you mental?  :-)
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07:17 <@adg_> yay #go-nuts
07:17 <@adg_> sorry to have been a bit absent lately.  so busy, but it will
be worth it
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07:26 < jessta_> adg_: is that goinstall goodness?
07:27 <@adg_> uamong some other stuff, yeah :-)
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07:49 < taruti> Did someone hack a key-value store library in Go?
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08:02 < jessta_> taruti: someone did, I don't remember what is was called
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08:13 < str1ngs> hmm how do I trim '\n' from a byte slice?
08:15 < str1ngs> Printf("%v",string(b[0:len(b)-1]))
08:15 < jessta_> str1ngs: bytes.Trim([]byte("pies\n"),"\n")
08:15 < str1ngs> ah thats it thanks.
08:20 < taruti> hmm.  Is there an easy way to split by regex?
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09:31 < xyproto> taruti: Go has regex, but compared to the other languages
in the Computer Language Benchmarks Game, it's used in the test where Go performs
worse than in the other benchmarks:
http://shootout.alioth.debian.org/u32/program.php?test=regexdna&lang=go&id=4
09:33 < xyproto> hm, now it just says "failed" for Go, but I've seen graphs
where Go is included for this benchmark, so I think it has worked before
09:34 < xyproto> ah, yes, Go gets a "throw: out of memory" and gets a
runtime error in connection with regexps
09:34 < xyproto> no idea why
09:37 < xyproto> when I compile and test the same program with the same
input and output here, it works great
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09:47 < xyproto> ah, here was the comparison I was looking for.  I wonder
why Go is comparatively slow when it comes to regexp:
http://shootout.alioth.debian.org/u64q/compare.php?lang=go#faster-programs-approximately
09:50 < uriel> xyproto: this has been discussed a thousand times, see gonuts
archives
09:50 < xyproto> uriel: ah, news to me, thanks :)
09:50 < uriel> xyproto: most languages use havily optimized over many years
(sometimes decades) regexp libs written in C
09:50 < xyproto> uriel: btw, do you happen to know how people profile Go
programs?
09:50 < xyproto> uriel: I see.  Understandable.
09:51 < uriel> Go's current regexp implementation is basically a toy example
09:51 < uriel> http://golang.org/cmd/prof/
09:52 < uriel> there is also now support for fancier cpu profiling and
stuff, but have not looked into it
09:52 < uriel> again, see archives
09:56 < xyproto> uriel: ok, thanks :)
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10:24 < fzzbt> i wish goinstall would know how to uninstall
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10:55 < wrtp> fzzbt: uninstalling is harder than installing
10:56 < wrtp> because you can't uninstall a dependency if something else is
using it
10:56 < wrtp> in general, rm -r $GOROOT/src/pkg/package_path works pretty
well
11:03 < kimelto> han syscall is broken on bsd :(
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11:31 < KBme> anyone know of an otp-like supervisor framework for go?
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11:36 < wrtp> KBme: difficult to do without support from the runtime
11:36 < wrtp> KBme: what does OTP stand for, BTW?
11:37 < KBme> something telecom platform iirc
11:37 < KBme> :)
11:38 < wrtp> ah, "open telecom platform"
11:38 < wrtp> that makes sense
11:38 < wrtp> i'm presuming you're meaning the ability to supervise other
processes and do something when they fail
11:39 < KBme> yep
11:39 < KBme> wrtp: exactly, that's what it stands for :)
11:39 < wrtp> i think that something like that will make it into go
eventually in some form
11:40 < wrtp> i found myself wishing for something like that recently
11:40 < wrtp> i was catching panics, but the panics were happening in
another goroutine, so i couldn't
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11:42 < wrtp> the question is what it should look like when, currently,
there's no type or value that describes a goroutine
11:44 < wrtp> i wonder if you'd need to allow goroutines to move between
supervisor groups
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12:00 < hjallow> Im using the template in go and would like to iterate over
an array structs I have.  The structs have some string values and I'd like to
print those, how can I do that?  Im using {.repeated section Posts}, and then the
@-mark, but that prints all those strings.  I'd like to go with something like
$.Title, where Title would be the variable I would like to print from the struct.
How can I do that?
12:02 < wrtp> hjallow: have you tried using @.Title?
12:02 < wrtp> or just {Title}
12:04 < hjallow> wrtp: wow, so simple it was.  {Title} made it!  Thank you
12:04 < wrtp> np
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12:36 < marten> What could be a reason that my program crashes with out of
memory and has hundreds of goroutines, even though I never start any?  does the
fmt package use them?
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12:38 < marten> and I have a curious problem.  I use the http server package
and handle requests.  each request handling can take quite some memory, around
70mb
12:39 < marten> however, when issuing many such requests, I eventually get
an out of memory error, even though it is always the same request and the
handlings are totally independent and sequential with runtime.GC() calls between
them
12:39 < marten> anyone else run into this?
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12:45 < wrtp> marten: hundreds of goroutines or hundreds of threads?
12:46 < wrtp> what platform are you using?  there was an error recently
fixed where threads would take loads of memory in error
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12:48 < marten> wrtp: hundres of goroutines
12:49 < marten> wrtp: I use the fmt and zlib packages, I can imagine they
generate them?
12:49 < wrtp> marten: no
12:49 < marten> oh, and it's on 386, btw
12:49 < wrtp> what OS?
12:49 < marten> linux
12:50 < marten> most goroutines seem to be started by io.Pipe
12:51 < marten> http server then, I guess
12:52 < wrtp> i can't see any calls to io.Pipe in http
12:53 < wrtp> what are all the goroutines doing?
12:53 < wrtp> could you paste all the stack traces?
12:54 < marten> this is one: http://pastebin.com/BmQTssyf
12:54 < marten> they're all like that
12:54 < wrtp> marten: could you paste *all* the traces?
12:55 < marten> oh, ok, hang on
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12:58 < marten> http://pastebin.com/Z9dMjT41
12:58 < wrtp> marten: are you using compress/flat ?
12:58 < wrtp> s/flat/flate/
12:59 < marten> on another occasion, btw, I got a "throw: out of memory",
same kind of trace
12:59 < wrtp> ah, you are
12:59 < wrtp> i know what your problem is
12:59 < wrtp> :-)
12:59 < wrtp> or at least i think i do
12:59 < marten> yes, probably, via zlib
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13:01 < wrtp> i bet you're not closing the Writer
13:01 < wrtp> (or the Reader)
13:01 < wrtp> that you get from zlib
13:02 < wrtp> hence the goroutines used to manage the pipe aren't cleaned up
13:02 < marten> ah, and they all keep their buffers in memory eh
13:02 < wrtp> no
13:02 < wrtp> there's no buffering in an io.Pipe
13:03 < wrtp> but each goroutine will take memory
13:03 < marten> oic
13:03 < marten> well, you're right, I'll fix that and check the memory usage
again
13:03 < wrtp> although i'd have expected many more than a few hundred before
it dies
13:03 < wrtp> there's probably other memory hanging around in the compressor
too
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13:10 < marten> wow, when I add defer dec.Close() (dec is from
zlib.NewReader()), memory usage shoots to even greater heights
13:11 < marten> for 1 request (around 4000 new zlib readers): 480MB instead
of 50
13:14 < wrtp> wow, you start 4000 zlib readers for 1 request?
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13:16 < marten> oh, my bad, the deferred call happened outside a loop
13:16 < marten> I guess the garbage collector usually takes care of things
some of the time, but couldn't anymore with the defer statement in place
13:17 < marten> on my laptop the memory usage is now quite a bit less,
thanks!  will try it on the linux server with larger requests now
13:18 < wrtp> marten: did you mean "inside a loop" ?
13:19 < marten> yes, the statement is inside a loop
13:19 < marten> so that's around 4000 defers :*)
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13:20 < wrtp> you know the defer won't actually happen until the function
returns, right?
13:20 < marten> yes
13:21 < wrtp> i'm not surprised it used loads more memory!
13:21 < marten> what I mean is that with the deferred close in place, there
was always a reference to the zlib reader until all 4000 were done
13:21 < wrtp> it would have prevented GC of dec
13:21 < marten> yes :)
13:23 < marten> so I gather a Close() is not strictly necessary, except for
the fact that I create so many zlib readers in a loop?
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13:25 < wrtp> Pipe will leak goroutines unless it gets closed
13:25 < wrtp> it should probably have a finalizer
13:28 < marten> ok, thanks wrtp!  that goroutine problem is now gone
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13:31 < wrtp> cool
13:34 < marten> memory usage is a lot less now :) still seems to go up more
than I'd like though..  (as seen through 'top').  every few requests it suddenly
goes up by a few MB. One request takes around 30MB now, but memory usage has risen
to 128MB
13:34 < marten> heap fragmentation, etc?
13:35 < wrtp> i don't know.  have you tried memory profiling?
13:36 < marten> yes, with http/pprof, but that was before your fix to the
zlib code, I'll have to do it again
13:36 < marten> seems to have stabilized around 128MB now
13:39 < xyproto> marten: cat /proc/PID/smaps can be handy, for an overview
of memory use, where PID is the pid of your running app
13:41 < xyproto> okay, perhaps not handy, but at least comprehensive ;)
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13:45 < marten> :)
13:47 < xyproto> "effective go" says that make creates slices, maps, and
channels only.  Is this really true?  Is it only those three?  For sure?  :)
13:47 < xyproto> Or can make be used to allocate&initialize other types as
well?
13:47 < xyproto> I just can't believe my eyes ;)
13:48 < marten> I think make() is because new() can't be used for the same
thing.  new([]int) would give you a *[]int
13:50 < wrtp> xyproto: that's correct
13:50 < wrtp> there was a proposal to have make(*T) be the same as new(T) is
now
13:51 < wrtp> i think it was a good idea
13:51 < wrtp> marten: i just did an experiment with finalizers and it looks
as if they don't work very well...
13:51 < wrtp> see http://code.google.com/p/go/issues/detail?id=1671
13:52 < wrtp> i think the go GC still has a way to go
13:53 < marten> ah, thanks!  yes, so it seems
13:54 < marten> I'm also running into other GC problems on x86.  like this:
http://code.google.com/p/go/issues/detail?id=1620
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13:54 < marten> and the occasional "malloc/free - deadlock", that shouldn't
happen either, right?  :)
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13:55 < wrtp> BTW the system is generally better trodden in its amd64
target, so if you're having problems with 386, you might try that
13:55 < xyproto> wrtp: thanks for the confirmation.  Combining make and new
sounds both interesting and sensible.
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14:02 < marten> wrtp: yes, I haven't run into any runtime problems on my
macbook.  It's all on the ec2 server
14:04 < wrtp> marten: which is only 32 bit, right?
14:04 < pTonnerre> And no IPv6
14:05 < marten> yeah
14:07 < marten> I'm going to abandon the daemon-style server, I think and
reimplement it as a cgi app.  More overhead because of forking and I can't easily
cache results, but that way I get a fresh Go process every time
14:09 < wrtp> marten: the go runtime should get better fairly soon - they're
prioritising bug fixes currently
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14:10 < wrtp> with a view to aiming for a stable release
14:10 < marten> good news, I'll switch back to the daemon asap then :)
14:11 < marten> don't want to think about having to reimplement the server
in C(++) :)
14:15 < xyproto> why does fmt.Println() give a memory location for printing
the pointer to an int, but not for printing the pointer to a struct?
14:16 < xyproto> if I print the address to an int, I get something like:
0xf8400000c0, but for a struct that's just three numbers, I get: &{0 0 0}
14:16 < xyproto> Is it just because it's friendlier?
14:16 < wrtp> xyproto: yes.  if you really want to see the pointer value,
use fmt.Printf("%p")
14:16 < xyproto> wrtp: I see.  Thanks :)
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14:52 < nsf> uhm..  guys
14:52 < nsf> type X *[10]Y;
14:52 < nsf> type Y X;
14:52 < nsf> is this should be valid or not?
14:52 < nsf> gc rejects that code
14:52 < nsf> but to me it looks valid
14:53 < nsf> since X's size doesn't depend on Y's size
14:53 < nsf> iant: ?
14:53 < nsf> someone?  :)
14:54 < wrtp> nsf: yeah, looks like a bug
14:54 < wrtp> type X *[10]X works fine
14:54 < wrtp> and that's just as recursive
14:55 < nsf> yeah
14:55 < wrtp> raise an issue
14:55 < nsf> ok
14:55 < nsf> I'm implementing the same stuff in crawl
14:55 < nsf> and I have the same bug
14:55 < nsf> :D
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15:00 < nsf> does anyone remember where spec says something about recursive
types?
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15:05 < nsf> can't find it :(
15:05 < nsf> I do remember some comments on that in gofrontend though
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15:10 < nsf> anyways, I don't see a reason why that's valid behaviour
15:10 < nsf> as wrtp pointed out
15:10 < nsf> type X *[10]X is the same as type X *[10]Y; type Y X;
15:11 < nsf> just a matter of indirection
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15:37 < nsf> http://ompldr.org/vODVxbg/2011-04-07-214046_796x354_scrot.png
15:37 < nsf> hehe, works in crawl
15:37 < nsf> :P
15:37 < nsf> size matters!
15:37 < nsf> :)
15:37 < nsf> lol
15:38 < aiju> a compiler which requies having $TERM set properly
15:39 < aiju> progress!
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15:39 < nsf> it doesn't
15:39 < nsf> I just use default ASCII escape codes
15:39 < aiju> ...  that's an oxymoron
15:39 < nsf> if isatty is false, no color stuff is being dumped
15:40 < nsf> isatty(fileno(stderr)) I mean
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15:41 * ww struggles to figure out what type X *X means
15:42 < nsf> ww: don't look at names look at types nature
15:42 < nsf> *X is just a pointer
15:42 < nsf> the type it points to is just a detail
15:42 < nsf> type X *X is a type X which is a pointer, that points to type X
15:42 < nsf> useless feature if used that way
15:43 < nsf> more useful in other scenarios
15:43 < nsf> like:
15:43 < nsf> type X struct { data int; next *X; }
15:43 < nsf> or
15:43 < xyproto> when should one be printing with log.Print* instead with
fmt.Print*?
15:43 < nsf> type X func() X;
15:44 < nsf> xyproto: log.* for logging, fmt.* for formatting and printing
15:44 < nsf> makes sense?  :)
15:44 < nsf> xyproto: log just provides a bit more flexibility
15:45 < nsf> you can redirect it in a more flexible way
15:45 * ww almost never uses fmt.Print, and only uses fmt.Sprintf for making
os.ErrorString
15:45 < aiju> ww: what do you use?
15:45 < nsf> I don't use 'log' packages
15:45 < ww> log
15:45 < nsf> I use fmt.Print :)
15:46 < xyproto> nsf: So far I've been using fmt as well, but I see source
code referring to log instead here and there
15:46 < ww> i generally assume the program will be run as a daemon or by
cron
15:46 < nsf> fmt.Fprintf(os.Stderr, ...) is my favourite :)
15:46 < ww> and i like to see file.go:lineno in the output
15:46 < xyproto> nsf: traditional and clean :)
15:46 < xyproto> ww: the line number argument is a good one, I think
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15:48 < nsf> omg
15:48 < nsf> str1ngs uses archlinux and his weechat says it's 0.3.0
15:48 < nsf> it's really old :)
15:48 < ww> has irc really changed that much recently?  ::
15:49 < nsf> ww: in what sense?
15:49 < wrtp> i tend to use log so i can easily distinguish between log
messages and genuine uses of fmt
15:49 < xyproto> nsf: 0.3.4 here, I use Arch as well, just ctcp nick version
me :)
15:49 < nsf> as a protocol it's all as in RFC :)
15:49 < nsf> xyproto: yeah, me too..  0.3.4
15:49 < wrtp> seeing import "log" is a sign that i haven't removed the
debugging
15:49 < wrtp> also, fmt.Printf isn't entirely thread safe
15:50 < wrtp> you can get interleaved output, which is annoying when you're
dealing with thousands of error messages
15:50 < aiju> nsf: the IRC RFC is followed by neither servers nor clients
15:50 < nsf> aiju: :D
15:50 < aiju> it's even worse than HTTP
15:50 < aiju> and yeah, that seems to be possible
15:50 < nsf> aiju: you should be more positive
15:50 < nsf> how about saying "this is awesome" about something?
15:50 < nsf> :)
15:51 < wrtp> nah, aiju is mr negative.  that's his role.
15:51 < xyproto> yeah, where's the picture of aiju with a t-shirt saying
"There is actually stuff I like"?  ;)
15:51 < xyproto> :P
15:51 < xyproto> (ref.  an earlier conversation)
15:52 < wrtp> aiju: are you actually uriel by another alias?
15:53 < aiju> wrtp: hahahahahahaha
15:53 < xyproto> I get a syntax error if I try out the panic/recover example
code at: http://gonuts.org/doc/go_spec.html#Handling_panics
15:53 < aiju> there are two things i like
15:54 < aiju> both of them meow and one of them likes salami
15:54 < xyproto> aiju: two very strange dogs?
15:54 < aiju> xyproto: :P
15:54 < nsf> cynizm, scepticism and pessimism are qualities of a good
software developer actually :)
15:55 < wrtp> xyproto: compiles fine for me
15:56 < xyproto> wrtp: strange.  Thanks.  I'll double-check everything I've
done.
15:56 < xyproto> nsf: I bet it's not the most innovative software
developers, but I guess that personality type writes good code
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15:58 < nsf> xyproto: well, I'm referring to one of the famous russian
engineer http://en.wikipedia.org/wiki/Sergei_Korolev
15:58 < nsf> "Short of stature, heavily built, with head sitting awkwardly
on his body, with brown eyes glistening with intelligence, he was a skeptic, a
cynic and a pessimist who took the gloomiest view of the future."
15:58 < nsf> that's the quote
15:58 < nsf> quite a person he was
15:59 < nsf> building a rocket out of sketches and launching it to space in
a month :)
15:59 < ww> yeah, but that's russians
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15:59 < nsf> it doesn't matter, the qualities of a person are more or less
the same for similar things
16:00 < nsf> if you are a software developer you need to be as pragmatic as
possible (imho)
16:00 < nsf> and these qualities help a lot
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16:00 < xyproto> There are so many people, so equal, but so weird.  Some
have a third nipple, while others have a beard.
16:01 < nsf> ww: but maybe I'm biased, since I'm russian as well
16:02 < nsf> still I think more about qualities than a concrete person
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16:10 < nsf> He was only ever referred to by the initials of his first two
names, SP, or by the mysterious title of "Chief Designer", or simply "Chief".
16:10 < nsf> lol, Master Chief?  :)
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16:30 < ww> nsf: znaio, ya toje
16:30 < nsf> hehe
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16:45 * synx` slaps dforsyth around a bit with a large trout
16:45 * synx` slaps dforsyth around a bit with a large trout
16:45 < synx`> dforsyth
16:45 < synx`> why you no idle proggit anymore
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17:05 < plexdev> http://is.gd/e5fPeU by [Russ Cox] in go/lib/codereview/ --
codereview: drop Author: line on self-clpatch
17:05 < plexdev> http://is.gd/Y0ugNK by [Russ Cox] in go/lib/codereview/ --
codereview: fix clpatch
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17:22 < plexdev> http://is.gd/LqOd6J by [Mikkel Krautz] in go/src/cmd/ld/ --
ld: fix Mach-O bss bug
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17:59 < taruti> Is there a timeframe for better GC?
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18:24 < plexdev> http://is.gd/uzuCbi by [Mikkel Krautz] in go/src/cmd/ld/ --
ld: fix Mach-O X86_64_RELOC_SIGNED relocations
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19:11 < plexdev> http://is.gd/ym8aUR by [Mikio Hara] in go/src/pkg/syscall/
-- syscall: fix build
19:12 < aiju> how hard is it to not break the build?
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19:17 < LuitvD> hello!  :)
19:18 < LuitvD> what's wrong with this bit:
http://paste.pocoo.org/show/367414/
19:19 < LuitvD> I'm not quite sure what causes this, so I hope someone here
can enlighten me :)
19:20 < TheMue> The b []byte is not used
19:20 < TheMue> due to the b, err := ...  declaring a new b
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19:21 < TheMue> := is declaration and assignment in one step
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19:27 < skejoe> Any easy way to draw an image.Image onto an X11 window using
exp/draw?
19:28 < niemeyer> LuitvD: You can use _ in an assignment, when you don't
care about the variable
19:28 < LuitvD> TheMue: so I should add var err os.Error before b, err :=
...  and change it to = instead of := to avoid this?
19:28 < niemeyer> _, err := ...
19:28 < niemeyer> LuitvD: ^
19:28 < LuitvD> niemeyer: yeah, but I do want the b outside the nested
function
19:28 < LuitvD> outside the for {} here
19:29 < LuitvD> (but an if block in my other code)
19:29 < hopso> "var err os.Error" and "="
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19:29 < skelterjohn> skejoe: as I recall, the only way to draw onto an x11
window with exp/draw is to manipulate an image.Image
19:29 < niemeyer> LuitvD: Ah, yes..  the error message has saved you in that
case.  You're declaring a *local* b
19:29 < TheMue> why do you use a for-loop?
19:29 < niemeyer> LuitvD: You want "=" indeed
19:29 < niemeyer> TheMue: LOL
19:30 < LuitvD> TheMue: it's just to put it in a block for the example
19:30 < LuitvD> TheMue: in my "real" code it's an if block
19:30 < TheMue> ok
19:30 < skelterjohn> skejoe: ah, a draw.Image, which embeds an image.Image
19:31 < LuitvD> TheMue: but thanks for pointing out a performance flaw in my
example there ;-)
19:31 < TheMue> I would have used a different structure.  I'm mostly
avoiding declarations with var.  instead I often return directly.
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19:32 < skelterjohn> i find the only time i use var is for globals, and for
when i want to avoid shadowing another variable when the LHS has multiple elements
19:32 < napsy> Hello.  Is there a guarantee for net.conn.Read() to read all
the incoming data or is it like C's read()?
19:32 < TheMue> skelterjohn: yep, exactly
19:32 < skelterjohn> napsy: It almost certainly just calls C's read()
19:32 < skelterjohn> but i haven't looked
19:32 < skejoe> skelterjohn: the problem is that exp/draw only has Draw(...)
which draws a single color rectangle onto the screen.
19:33 < LuitvD> TheMue: I'm just not thinking static enough yet, coming from
extensive use of Python
19:33 < aiju> napsy: there is a ReadAll somewhere
19:33 < skejoe> skelterjohn: ah wait.
19:33 < napsy> skelterjohn: so I have to repeat Read() to get all data?
19:33 < skejoe> "// Screen returns an editable Image for the window."
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19:33 < skelterjohn> if you can put your image.Image into
theWindow.Screen().Image, you're set
19:33 < aiju> napsy: io.ReadFull
19:33 < TheMue> LuitvD: Hehe, I'm from Python, Smalltalk, Erlang, all
dynamic.
19:33 < skelterjohn> napsy: what aiju said
19:34 < napsy> hum so I have to create a Reader from my connection?
19:34 < LuitvD> TheMue: lol, I'm trying hard to get used to explicitly
declaring variables in the scope I use them
19:34 < aiju> napsy: the connection is a reader
19:34 < aiju> io.ReadFull(connection, buffer)
19:34 < napsy> oh ok
19:35 < TheMue> LuitvD: One of the powerful elements of Go is :=.
19:35 < LuitvD> TheMue: true, but that's what makes it dangerous too (my
problem with this piece of code was because of it)
19:36 < skelterjohn> it's important to know what an operator does before you
use it
19:36 < LuitvD> hehehe
19:36 < TheMue> LuitvD: Hmm, never had any problem.  Using a meaningful
variable name helps
19:36 < LuitvD> oh I know, I just overlooked a consequence
19:36 < aiju> skelterjohn: that's an answer to many problems ;P
19:36 < LuitvD> hahah
19:37 < LuitvD> "don't use it before you know what it does"
19:37 < LuitvD> thanks for the great advice, I'm off hacking again :)
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19:41 < skejoe> skelterjohn: uhm could you help me do that?  :)
19:41 < skelterjohn> my quick look at the godoc didn't suggest anything
other than looping and setting pixels
19:42 < skelterjohn> which is an unsatisfying solution, obviously
19:42 < skelterjohn> the exp/draw stuff is not particularly polished (like
anything in exp)
19:42 < skejoe> Yeah that's what I thought too.
19:43 < skejoe> But I will do that.  Thanks.
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19:44 < plexdev> http://is.gd/s07GZf by [Russ Cox] in go/src/pkg/syscall/ --
syscall: freebsd/386 Syscall9 (fix build)
19:44 < plexdev> http://is.gd/BHwhtk by [Russ Cox] in go/src/pkg/syscall/ --
syscall: fix freebsd/386 again
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19:57 < hopso> I'm having hard time trying to wrap my head around channels.
I never know if I should use them or not.
19:58 < skelterjohn> they're certainly not the only tool to use
19:58 < skelterjohn> in general, communication between goroutines should be
done using channels
19:58 < skelterjohn> they can be used for other things as well
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23:02 < plexdev> http://is.gd/vUkxva by [Russ Cox] in 2 subdirs of go/ --
gc: bug327
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23:11 < bren2010> I have the 2 programs: http://pastebin.com/jTBCX7vE and
http://pastebin.com/6P6jmQng Can anybody help me figure out why the second one
can't read anything that the first one is writing to the UDP socket?  :/
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23:18 < skelterjohn> you're ignoring errors
23:18 < skelterjohn> perhaps if you inspected the error values, you'd know
what went wrong
23:19 < skelterjohn> _ing errors is a bad habit to get into
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23:21 < skelterjohn> i mean, it's not a big deal when you're just trying to
see if something makes sense
23:21 < skelterjohn> but if it doesn't work, bren2010, the first thing you
should do is inspect the errors
23:21 < bren2010> mhmm
23:21 < bren2010> That's what I'm working on doing now.
23:22 < skelterjohn> a standard thing to do is to have a deferred function
that checks the error, and to return if something returns an error that isn't nil
23:23 < bren2010> All of the places where errors could be are nil.
23:23 < skelterjohn> then nothing went wrong, clearly :)
23:23 < bren2010> But...
23:23 < skelterjohn> a jok
23:23 < skelterjohn> e
23:23 < bren2010> :p
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23:25 < skelterjohn> are you sure you're getting anything from extCon?
23:26 < skelterjohn> and what is printed with fmt.Println(n)?
23:26 < bren2010> Yes.  fmt is printing IRC info to the terminal.
23:26 < bren2010> However many bytes where sent that time.  72, 64, etc.
23:26 < skelterjohn> but you're getting non-zero numbers there, is what i'm
asking
23:27 < bren2010> Yes.
23:27 < skelterjohn> what does the other end print out?
23:27 < bren2010> Nothing.
23:28 < skelterjohn> have you looked at what udpaddr ends up being?
23:29 < bren2010> In which file?
23:29 < skelterjohn> either/both
23:31 < bren2010> first one: fmt.Println(udpaddr) = 127.0.0.1:4000
23:31 < bren2010> second one: fmt.Println(udpaddr) = 127.0.0.1:4001
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23:33 < skelterjohn> i'm putting together a small example test
23:33 < skelterjohn> will be a min
23:33 < bren2010> Ok.
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23:44 < skelterjohn> my smaller example appears to have the same problem
23:45 < skelterjohn> the client's read does not return
23:45 < bren2010> :\
23:45 < bren2010> Why do you think that is?
23:46 < skelterjohn> i dunno, never tried any UDP stuff with go before
23:46 < skelterjohn> might be doing something silly
23:49 < skelterjohn> a search in $GOROOT/src doesn't show any good examples
of using UDP
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23:52 < skelterjohn> aha
23:52 < skelterjohn> foudn the error i think
23:53 < bren2010> :o
23:53 < bren2010> What is it?
23:53 < skelterjohn> nope
23:53 < skelterjohn> nevermind
23:53 < bren2010> <_<
23:53 < skelterjohn> but searching brought me to
https://groups.google.com/forum/#!topic/golang-nuts/mGBeZ5Fphpc
23:57 < skelterjohn> this is the code i was using to test, btw
http://pastebin.com/wHRi76TM
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--- Log closed Fri Apr 08 00:00:50 2011