--- Log opened Thu Jul 22 00:00:05 2010
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00:09 < plexdev> http://is.gd/dBmnj by [Micah Stetson] in go/src/cmd/gotest/
-- gotest: fix the glob pattern in the top-of-file comment
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00:26 < plexdev> http://is.gd/dBnl7 by [Andrew Gerrand] in go/src/ -- build:
clean.bash to check that GOOS and GOARCH are set
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12:20 < DavidJones> do you know why cgo has no problems finding curses.h,
but doesn't find panel.h?  all the necessary curses files are
12:20 < DavidJones> installed
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12:21 < DavidJones> found it.
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12:22 < str1ngs> check your include directory
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12:23 < str1ngs> I'm not sure what OS you are on.  but I'm guessing you are
using <panel.h> ?
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12:24 < str1ngs> err nvm you found it :P
12:24 < DavidJones> huh, I thought I found it, but seemingly I'm wrong
12:24 < DavidJones> i'm on an amd64 Linux
12:25 < DavidJones> and I'm using <curses.h> and <panel.h>
12:25 < DavidJones> my linker flags are "-lpanel -lncurses"
12:26 < str1ngs> find /usr/include -name panel.h
12:26 < str1ngs> sometimes headers get reworked to something like
/usr/include/curses
12:27 < DavidJones> yeah...  that's true!
12:27 < DavidJones> "/usr/include/ncurses/panel.h"
12:27 < str1ngs> <ncurses/panel.h> should work iirc
12:27 < DavidJones> I'll give it a try
12:28 < DavidJones> yes, it worked : ) thanks a lot.
12:28 < DavidJones> one more question:
12:28 < str1ngs> your going to laugh when I tell you I"m not a C programmer
:P
12:28 < DavidJones> nah, just smiling ; )
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12:29 < str1ngs> btw there is a 3rd party ncurces go package.
12:29 < DavidJones> I forked that one
12:29 < str1ngs> ah gotcha
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12:29 < DavidJones> I worked on it a little, added atomicy, and now I want
to add panel support : )
12:29 < DavidJones> do you know if that behaviour is the same on different
machines?
12:30 < str1ngs> it vares on distros/OS
12:30 < DavidJones> so, do I have to fear that my include will no longer
work on a different machine?
12:30 < str1ngs> thats why pkg-config is better to use sometimes
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12:31 < DavidJones> hmh...  will learn about pkg-config now.
12:31 < str1ngs> I'm not sure how go would handle that though.  I barely
understand the C concept
12:31 < DavidJones> I never programmed a single line in C :/
12:32 < DavidJones> so I'm all new to this kind of stuff ; )
12:35 < str1ngs> something like pkg-config --variable=includedir pango
12:35 < str1ngs> for some reason I dont have a pkgconfig for ncurses
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12:56 < GavinTong> Hi all, are there any advantage and drawback to write a
kernel in GO? would you mind giving some opinion?  thx
12:57 < jessta> GavinTong: there is a toy kernel written in Go
12:58 < bartbes> heh nice
12:58 < GavinTong> is it Tiny in the runtime pkg?
12:59 < jessta> yeah
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12:59 < bartbes> how do i use it?
13:00 < GavinTong> follow the readme, I just try it b4
13:01 < bartbes> what readme?
13:03 < GavinTong> inside the "go/src/pkg/runtime/tiny", is it?
13:04 < bartbes> oh
13:04 < bartbes> heh
13:04 < bartbes> ofc it's in src
13:04 < bartbes> :D
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14:18 < sahid> someone an idea on how to fix this bug?  http://goo.gl/mjO6
14:19 < DavidJones> isn't that a python problem?
14:20 < sahid> i dont think
14:20 < DavidJones> also it has a "Solved the issue by:"
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14:24 < sahid> yes, i will try
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15:08 < nsf> is it possible with utf-8 to move backwards?  like I see this
char in arbitary position and now I want to find out previous char
15:09 < exch> treat a string of utf8 characters as an array of runes instead
of bytes.
15:10 < nsf> well, I can't do that
15:10 < exch> why not?
15:10 < taruti> why not?
15:10 < nsf> because I have a byte buffer and a position
15:10 < nsf> and I don't want to decode everything that is before that
position
15:10 < taruti> you are decoding when searching
15:11 < nsf> I don't search!
15:11 < taruti> thus the problem becomes "how do I match /.x/ on a string"
15:11 < taruti> how do you know the position?
15:11 < nsf> just know it
15:12 < taruti> well if you sync back 4 bytes you can find the character
boundary
15:12 < nsf> ok, I took a look at wiki
15:12 < nsf> it is possible with utf-8 to move backwards
15:13 < nsf> question answered
15:13 < ampleyfly> =)
15:15 < nsf> I should look at first two bytes, if it's 10 then the byte is a
part of a sequence, if it's 11 or 0X (X as any byte) then it's a first byte of a
sequence or a standalone char
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15:15 < nsf> bits*, sorry
15:16 < nsf> therefore it's possible to move backwards that way, which is
great :)
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15:17 < nsf> and actually go utf8 lib has this function: utf8.RuneStart
15:18 < nsf> which is twice as great as it was before :)
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16:06 < plexdev> http://is.gd/dCgxV by [Russ Cox] in go/test/ -- test: fail
is for bad exit status only
16:06 < plexdev> http://is.gd/dCgyt by [Russ Cox] in go/src/cmd/8l/ -- fix
build
16:07 < plexdev> http://is.gd/dCgyU by [Russ Cox] in 2 subdirs of go/src/ --
libmach: correct handling of .5 files with D_REGREG addresses
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17:59 < tobiassjosten> The Read method for TCPConn takes argument "b
[]byte".  What kind of data is that?
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18:04 < tobiassjosten> Found an usage example:
http://github.com/purex01/netsnail/blob/09e2cf24a17d1bbe881af9c8c88499e8d6c57380/src/delayproxy.go#L54
18:05 < exch> it will be filled with the received data
18:09 < jessta> tobiassjosten: yeah, the read method with attempt to read
cap(b) bytes in to b, it will block until it does
18:12 < tobiassjosten> exch, jessta: How can i print that buffer?
18:14 < exch> if it's a slice, you can do string(mybuffer)
18:14 < exch> not sure if that works with a fixed size array.  I dount it.
In which case yuo'll have to extract the data as a slice first
18:14 < exch> *doubt
18:15 < exch> string(mybuffer[0:size]) should work
18:15 < exch> where siz eis the number of bytes that have been read
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18:16 < exch> I find it a little more convenient to wrap the tcp connection
in a bufio.Reader and/or Writer and use those to do the reading/writing
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18:20 < tobiassjosten> exch: That casted it correctly.  Thanks!
18:20 < tobiassjosten> Woo!  It's connected and printing.  :D
18:20 < exch> yay :)
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19:06 < kmeyer> jessta: cap(b) or len(b)?
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19:24 < DavidJones> kmeyer ?
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19:32 < kmeyer> DavidJones: ?
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19:34 < DavidJones> kmeyer: "cap or len" what do you mean?
19:42 < kmeyer> earlier jessta made a comment and mentioned cap(b).  I
thought it used len(b).  That's all
19:43 < kmeyer> if you don't know what cap(b) and len(b) mean, read the
tutorial
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19:44 < KirkMcDonald> Or the spec.
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[]
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19:48 < DavidJones> kmeyer, I know perfectly what cap and len mean
19:48 < DavidJones> kmeyer, I was just thinking you had a question about
them
19:48 < DavidJones> kmeyer and wanted to help you ; )
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20:12 < kmeyer> ah, I see
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20:32 < tobiassjosten> I'm having some problems with threading in Go. Would
anyone be so kind and check my 59 lines of code out and tell me why it's not
printing output from the server it connects to?  http://pastebin.com/A1Qv9558
20:35 < Ginto8> threading?  you mean goroutines?
20:35 < tobiassjosten> Ginto8: Yeah, those.  :)
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20:36 < Ginto8> is this supposed to be an intermediate server or something?
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20:38 < tobiassjosten> Ginto8: Exactly, a proxy.
20:38 < Ginto8> hm
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21:17 < JayWork> Hey guys..  Anyone know if there's a way to get the length
of the Request.Body buffer from http when ContentLength is -1?
21:31 < JayWork> I don't want to set a static buffer, so I'm not sure how
else to do it
21:31 < JayWork> this is my first from-scratch go project
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21:35 < Ginto8> JayWork: lemme look up what a Request.Body buffer is =P
21:35 < JayWork> mmk.  It's in the http package
21:35 < Ginto8> yep
21:35 < MaybeSo> I think it's an io.ReadCloser made up of a struct holding
the buffered reader and the actual socket
21:36 < Ginto8> yes
21:37 < Ginto8> you want a buffer (aka []byte) and read in all the data,
check the length of the read, and if there's an EOF
21:38 < Ginto8> then concatenate it to another buffer that will be the final
product
21:38 < Ginto8> the final product can be a string
21:38 < Ginto8> you just have to cast from the []byte explicitly
21:39 < JayWork> Wait...  so I can just say []byte and not give it a size
and it'll do it dynamically?
21:39 < JayWork> buf_size = response.ContentLength; buf := make ([]byte,
buf_size); is what I had..  but ContentLength is giving me -1 a lot
21:40 < Ginto8> then have a default buffer size
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21:40 < Ginto8> and then read until there isn't anything left in the Body
buffer
21:40 < Ginto8> actually
21:41 < JayWork> So like fgetc style where you read until there's not an
error?
21:41 < Ginto8> wait
21:41 < JayWork> until theres an error**
21:41 < Ginto8> one sec
21:41 < JayWork> ok
21:41 < Ginto8> theres a func to read in a whole io.Reader and spit out a
[]byte
21:41 < Ginto8> or not
21:41 < Ginto8> look into io.ReadFull
21:42 < Ginto8> no wait
21:42 < Ginto8> look up ioutil.ReadAll
21:42 < Ginto8> it reads a whole io.Reader buffer and returns a []byte
21:43 < Ginto8> anyway good luck I'll bbl if you're still having trouble
21:44 < JayWork> Alright, thanks :D
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22:22 < JayWork> Anyone know of anyone working on a Go compiler in Go and/or
a Go OS?
22:23 < i__> i only know of http://gitorious.org/gogo
22:24 < exch> For a Go OS you need a runtime that is entirely independent of
libc and such.  There has been some work in that department, but I'm not sure what
it's state is
22:25 < JayWork> exch, Yeah..  I wrote an OS in D when that came out and got
the runtime stuff working
22:25 < JayWork> I just didn't know if anyone had worked on it for Go yet
22:25 < exch> there is a tiny go runtime for 386 architecture somewhere
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22:25 < exch> i'm trying to find it atm
22:27 < exch>
https://code.google.com/p/go/source/browse/src/pkg/runtime/tiny/README?r=5b03f43f67486d9e39c2e82434bffa0e5c14fbff
22:28 < exch> the source is also in your go dir.
$GOROOT/src/pkg/runtime/tiny
22:30 < JayWork> Ahh..  sweet.
22:31 < JayWork> i'll see if I can get basic fmt working
22:31 < JayWork> inside it's on OS that is * :)
22:34 < MaybeSo> anyone here use the go ebnf library?
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22:48 < tobiassjosten> What's the state of regexp in Go? I noticed it's
quite slow but I also found discussions about it being worked on.
22:49 < exch> it's a very simple implementation.  Missing a fair bit of
stuff to.  Apparently there's a go port of RE2 in the works, but I haven't seen it
yet
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22:52 < tobiassjosten> exch: A shame.  :/ That's a critical part of the
project I was going to build in Go.
22:52 < Ginto8> tobiassjosten: yeah atm it's just stopgap
22:53 < MaybeSo> tobiassjosten: right now I'd say it was unusable unless you
don't plan to execute it often (e.g., I'd consider using it once to validate a
command line input argument, but wouldn't use it to check hundreds of lines of
input)
22:54 < Ginto8> it might be a good idea to create a pipe and spawn a child
sed/grep process to retrieve data
22:55 < Ginto8> that may actually be a little faster
22:55 < Ginto8> idk tho I'm kinda clueless with that stuff =/
22:55 < tobiassjosten> Ginto8: Worth trying.
22:55 < tobiassjosten> I'll be parsing lots of small text snippets and
patterns though, so maybe the overhead makes it not worth it.  But I'll try.
22:56 < Ginto8> tobiassjosten: you may even be able to use a C regexp
library via cgo
22:56 < tobiassjosten> And regexp is bulky and slow in all implementations,
so maybe I should look for alternatives anyway.
22:57 < tobiassjosten> Ginto8: cgo?  I'll look that up.  Thanks!
22:57 < Ginto8> that too =P
22:57 < Ginto8> cgo is an amazingly useful tool for go
22:57 < Ginto8> I'm using it to interface with SDL/OpenGL for my current
project
22:59 < tobiassjosten> Ginto8: What are you building?
23:00 < Ginto8> currently a graphics engine for a game, I'll probably end up
making a platformer/shooter along the lines of teeworlds
23:01 < tobiassjosten> Cool.  Sounds like quite the undertaking.  :)
23:01 < Ginto8> yes it is
23:01 < Ginto8> but I need to make something worth showing off
23:01 < Ginto8> and this'll be it
23:01 < Ginto8> ;)
23:06 -!- skelterjohn [~jasmuth@wsip-98-175-243-116.sd.sd.cox.net] has quit [Quit:
skelterjohn]
23:06 < tobiassjosten> So I'm building a proxy, where I dial a TCP
connection and start listening for incoming connections.  Problem is I can't seem
to get around either of them blocking reading/writing of the other.  Can Go work
asynchronous/"event-based" with this, somehow?
23:06 < Ginto8> tobiassjosten: buffered channels?
23:07 < tobiassjosten> Ginto8: I tried that, I think, but it wont work.
Either the client or the server connection keeps blocking the other.
23:07 < Ginto8> look at the $GOROOT/GoDay*.pdf's
23:07 < Ginto8> hm
23:08 < tobiassjosten> http://pastebin.com/UTPEy5AR is my current code.
23:08 < Ginto8> ah
23:08 < tobiassjosten> Checking those PDFs.
23:08 < Ginto8> SetTimeout()
23:08 < Ginto8> look at Conn.SetTimeout()
23:08 < Ginto8> http://golang.org/pkg/net/#Conn
23:09 < tobiassjosten> Takes an integer.  Does that mean it'll block for a
minimum of one second?  That's a bit too much I'm afraid.
23:10 < Ginto8> SetReadTimeout sets the time (in nanoseconds)
23:10 < Ginto8> same for SetWriteTimeout and SetTimeout
23:10 < Ginto8> right from the comments on the Conn interface
23:11 < tobiassjosten> Ohh, I missed that part.  :)
23:11 < Ginto8> ok I'll bbl
23:11 < tobiassjosten> Feels kind of like a hack though, don't you think?
23:11 < Ginto8> a little
23:11 < Ginto8> not really
23:11 < Ginto8> unless you have another goroutine
23:12 < Ginto8> and let that one hang
23:12 < Ginto8> and have a buffered channel
23:12 < Ginto8> so the main ones don't hang
23:12 < Ginto8> also look into the "comma ok" idiom
23:12 < Ginto8> anyway bye
23:12 < tobiassjosten> Ginto8: Thanks for the help!
23:16 < exch> tobiassjosten: my irc thingy in go has 2 go routines that get
spawned after connecting to the irc server.  One routine does the reading, the
other the writing.  They both use buffered channels to read/write data to/from.
The main 'thread' is the blocking one which simply polls the incoming channel or
data and handles it as needed.  From there you can write data into the ougoing
channel whenever you want.
23:16 -!- kanru [~kanru@118-168-236-243.dynamic.hinet.net] has joined #go-nuts
23:17 < tobiassjosten> exch: Sounds like I could learn from that.  Would you
mind sharing (some of) your code?
23:17 < exch>
http://github.com/jteeuwen/calculon/blob/master/bot/net/network.go and
http://github.com/jteeuwen/calculon/blob/master/bot/main.go#L39 show how that
works
23:18 < tobiassjosten> exch: Awesome!
23:18 -!- thiago__ [~thiago@189.107.224.222] has joined #go-nuts
23:20 < exch> Incidentally, that program uses the current go regexp package
to parse all incoming irc data.  it works, but it is a bit of a hack and not very
fast as far as I can tell.  So while it works, you may want to go for something
else if you need speed
23:21 < tobiassjosten> exch: Right.  Even more juicy reading for my specific
case then.  :)
23:21 < exch> should be fun then :)
23:21 < tobiassjosten> Is there a coding standard for Go that promotes tab
for indention?
23:22 < exch> I prefer tabs myself, but you can use spaces.  I do think 4
spaces are the accepted standard there
23:22 < exch> the gofmt tool converts spaces to tabs by default, unless you
specify some commandline flag I believe
23:23 < tobiassjosten> I prefer tabs as well but have yet to work with a
project where that's the standard.  So I was hoping.  :P
23:24 < tobiassjosten> exch: Whoa!  Nice track record for Go packages there.
23:24 < exch> I've been busy :p
23:25 < tobiassjosten> exch: Why is you network.go in the "main" package and
not in a "network" one like how I've seen others do?
23:26 < exch> because in this particular app I don't need it in any other
apps/packages
23:26 < exch> So may as well just put in with the rest of the app
23:26 < exch> Putting code in separate packages is really only usful if you
are going to reuse the code in several places
23:27 < tobiassjosten> Makes sense.
23:28 -!- Venom_X [~pjacobs@71.21.124.111] has quit [Quit: Venom_X]
23:28 <+danderson> you can buy a protective sleeve for it that will solve
the connection issues however!
23:28 <+danderson> gah, fail
23:37 < tobiassjosten> This line: func (this *Network) Open() (err os.Error)
{
23:38 < tobiassjosten> As I understand it, it defines the Open() method for
the Network "class".  But what is the "(err os.Error)" part?
23:40 < exch> it defines the return type as os.Error
23:40 < exch> and err names it explicitely
23:40 < exch> it's the same as saying just 'os.Error' and then manually
defining the err var inside the function
23:41 < tobiassjosten> Ahh.
23:44 * araujo greets around
23:50 -!- jhawk28 [~jhawk28@72.40.31.201] has quit [Ping timeout: 265 seconds]
23:50 < Ginto8> tobiassjosten: you should at least skim the spec, it goes
over stuff like that ;)
23:51 < Ginto8> that and the tuts on the website
23:51 < tobiassjosten> Ginto8: Oh I am, in tiny chunks.  It's a bit much to
take in at once so I try some trial and error.  Sorry for noobing out, I'll RTFM
better.  ;)
23:52 < Ginto8> no it's fine
23:52 < Ginto8> just makin sure you put it on the agenda
23:53 < Ginto8> cuz go's spec is actually a fairly easy read (as far as
specs go), and it's definitely worth it
--- Log closed Fri Jul 23 00:00:05 2010