--- Log opened Sat May 08 00:00:56 2010
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00:32 < jimi_hendrix> hello, which function should i look at for downloading
the webpage source in the library?
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00:34 < exch> jimi_hendrix: check out the http package.  It has a Get()
function
00:34 < jimi_hendrix> thanks
00:38 < jimi_hendrix> exch, also, is there a ncurses-like package?
00:39 < exch> if there is, it's gonna be listed here:
http://go-lang.cat-v.org/library-bindings
00:39 < exch> looks like there's 'termbox' and 'gocurses'
00:42 < xorl> wonder if there is a cocoa one
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00:47 < jimi_hendrix> thanks
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01:26 < plexdev> http://is.gd/bZsPl by [Robert Griesemer] in go/doc/ -- go
spec: simplify section on channel types
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01:42 < plexdev> http://is.gd/bZtMa by [Robert Griesemer] in go/src/pkg/big/
-- big: more cleanup
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04:23 < itrekkie> Can someone point me toward some resources regarding
layout of a project, particularly how to split up amongst a bunch of files/import
them from a "main" file
04:27 < jessta> itrekkie: generally people put each package in a directory
of it's own with a make file
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04:28 < itrekkie> jessta: I'm doing that now, using the Makefile from the
"how to write go code" page; I'm interested in producing an executable and import
other files
04:29 < gordolinux> any way to convert a []interface{} to []T with type
assertions?
04:29 < jessta> gordolinux: sure, just loop through the each one
04:32 < gordolinux> i meant without loops, but i guess the answer is "no"
then
04:32 < jessta> how else would you do it?
04:33 < gordolinux> i was trying something like iface.([]string)
04:34 < gordolinux> obviously, it didn't work
04:34 < jessta> how do you know that all the items in the []interface{} are
strings?
04:35 < gordolinux> is was trying to use that with iterable.StringArray
04:36 < gordolinux> but it's not so useful since iterable.Data() returns a
[]interface{}
04:39 < gordolinux> i can wrap it, but then the code will be as big as not
using iterable at all
04:39 < jessta> gordolinux: what are you trying to do?
04:39 < chaos95> if you know that /win 44
04:40 < chaos95> oops, sorry folks
04:40 < gordolinux> jessta: drop the commented lines from a file
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04:41 < jessta> gordolinux: what are you using iterable.Data() for?
04:42 < gordolinux> i'm doing something like: ul :=
iterable.Data(iterable.Filter(iterable.StringArray(lines), notComment))
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04:46 < jessta> you could drop the iterable.Data and use the Iterable.Iter()
in a for loop with a type assertion to build your []string
04:47 < gordolinux> yeah, i guess i'll have to do that.  thanks jessta.
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09:17 < napsy> Why can't I write a for loop as " for ; str, err :=
r.ReadString(' '); err != nil {
09:17 < napsy> ?
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09:20 < jessta> napsy: I don't think that's right
09:20 < jessta> you can't assign in a condition
09:21 < napsy> oh
09:22 < jessta> for str,err := r.ReadingString(' '); err!=nil; str,err =
r.ReadString(' ') {
09:22 < napsy> hm that's not very pretty
09:24 < jessta> what is unpretty about it?
09:24 < napsy> the call to ReadString() repeats
09:25 < napsy> well the call doesn't repeat but is written twice
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12:09 < napsy> Hello.  Can I disable automatic structure alignment so if I
send the structure over the network, the size would stay portable?
12:11 < taruti> napsy: just use padding fields
12:11 < taruti> napsy: don't forget endianess
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12:12 < napsy> what if I try to avoid extra bytes to slim down data size
12:13 < taruti> use compression :)
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12:13 < napsy> it's for an embedded device that doesn't support compression
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17:54 < no_mind> why does go lang has ForkExec call in os package instead of
two commands fork and exec
17:55 < jessta> no_mind: because fork() is problematic in go
17:56 < no_mind> but ForkExec requires params, what If I just want a simple
fork ?
17:57 < jessta> you can't fork a go program, it's messy
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18:00 < jessta> no_mind: why do you want to fork?
18:00 < kimelto> how do you do to daemonize a prog in go then?  :)
18:00 < taruti> C wrapper
18:01 < kimelto> to be a direct child of init?
18:01 < no_mind> jessta, ooking at multi-process programing in go
18:01 < no_mind> looks like goroutine are the prefered way
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18:11 < anschelsc> Is it possible to read exactly one character from stdin
without waiting for newline?
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18:13 < anschelsc> in python this involves setting the terminal on raw mode,
but I'm not quite sure how to do that...
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18:27 < bortzmeyer> kimelto:
http://groups.google.com/group/golang-nuts/browse_thread/thread/2b29d93b90501a4b/95242bfb7ae0549e
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18:30 < kimelto> the background feature of the shell is not an option.  I
ssh into my machine, type /my/service &, disconnect, the shell is killed, so is
the daemon
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18:30 < kimelto> I like the "do the syscall yourself" way :p
18:32 < sladegen> nohup or disown doesn't work?
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19:37 < exch> does go have some package/function to convert numbers to a
byte slice?  eg: int64 or float64?
19:45 < Surma> exch: that probably only possible using "unsafe" since you
are trying to break type-safety
19:45 < Surma> (although converting an int into a byte slice might also be
accomplished using shift operations)
19:46 < exch> yea probably.  was just hoping there'd be a convenient way :)
19:46 < exch> in this case the values will always be int64 or float64
19:46 < Surma> well, for floats you gotta user unsafe
19:47 < exch> If all else fails, I can cheat by simply Sprintf()'ing them to
a string and turning that into a byte slice :p That is just nasty though
19:48 < exch> In fact, I don't think I can bear the shame of that
19:48 < exch> *bare
19:57 < Surma> That's almost as bad as inventing duffy's device
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20:15 < pancake> what is the equivalent of char **foo={"foo","bar",..}; in
Go?
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20:19 < kmeyer> exch: look at encoding/binary
20:20 < kmeyer> pancake: var foo = []string{"foo", "bar", ..}
20:20 < pancake> thanks
20:21 < pancake> can I iterate like in foreach() ?
20:22 < kmeyer> for _, f := range foo { }
20:22 < kmeyer> the first parameter is the index into foo, but I don't think
you care what it is
20:22 < pancake> thanks again :)
20:22 < kmeyer> np :)
20:24 < pancake> is there any preprocessor in Go?
20:24 < Surma> npoe
20:24 < Surma> nope*
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20:31 < kmeyer> not unless you do it manually
20:31 < kmeyer> you might be able to get away with using the C preprocessor
if you really want
20:31 < kmeyer> but it's definitely not supported by go folks
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20:41 < meatmanek> what's the easiest way to parse a decimal integer from a
string?
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20:44 < exch> kmeyer: thanks, that works nicely.
20:45 < exch> meatmanek: strconv.Atoi() or strconv.Atof() and related
functions
20:45 < meatmanek> thanks
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21:01 < kmeyer> exch: np :)
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21:07 < plexdev> http://is.gd/c0wcq by [Robert Griesemer] in go/src/pkg/big/
-- big: cleanups and performance tuning
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21:39 < hard_shooter> Hi
21:40 < hard_shooter> why new([len(array)]byte) doesn't work ?
21:41 < exch> nope.  A fixed array needs a constant value as size
21:42 < exch> make a slice like this: s := make([]byte, len(array))
21:43 < hard_shooter> hmmm
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21:51 < hard_shooter> ok it's logic...
21:59 < hard_shooter> how do I get the line of a runtime error ?
22:00 < hard_shooter> main.sort+0x34d does speak to me :)
22:00 < kmeyer> it should print a line number near there
22:00 < kmeyer> do you see "main.go:XXX" somewhere?  (where XXX is a number)
22:01 < hard_shooter> Oh
22:01 < hard_shooter> that's because I have many goroutines
22:01 < kmeyer> ahh
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22:07 < hard_shooter> ah ah I'm nowhere...
22:07 < hard_shooter> My goroutines are either sending or receiving
22:09 < hard_shooter> can we know which goroutines have sent the error ?
22:10 < hard_shooter> ok that's good
22:10 < hard_shooter> find it myself
22:10 < exch> without a proper debugger, the stacktrace is the best you'll
get unfortunately
22:12 < hard_shooter> the main stacktrace is the one if the good goroutine
:)
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22:21 < hard_shooter> we can't do array[0:0] ?
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22:25 < kmeyer> what's the goal of array[0:0]?
22:25 < kmeyer> the empty slice?
22:25 < hard_shooter> no
22:25 < hard_shooter> first element
22:25 < kmeyer> array[0:1]
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22:26 < exch> or just array[0]
22:26 < kmeyer> but that makes a slice containing just the first element
22:26 < kmeyer> what exch said selects the first element by itself
22:26 < hard_shooter> yep
22:26 < hard_shooter> that's the goal
22:26 < kmeyer> kk :)
22:26 < hard_shooter> I'm making a recursive sorting algorithm to pratice go
:)
22:27 < kmeyer> cool :)
22:28 < kmeyer> that's my favorite way to pick up new languages
22:29 < hard_shooter> but I've forget that array[0:1] and array[1:2] don't
have a common element...
22:32 < kmeyer> :P
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22:47 < hard_shooter> \o/
22:47 < hard_shooter> done
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22:55 < hard_shooter> goroutines instead of recursivity doesn't seem very
good xD
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22:57 < hard_shooter> oh
22:57 < hard_shooter> maybe I should not create arrays on each level of
recursivity
22:58 < hard_shooter> xD
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22:58 < hard_shooter> for 1 000 000 values that use a lot of memory xD
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23:02 < hard_shooter> If I use for parameter &array[0:len(array)/2] will it
be able to overrun ?
23:03 < kmeyer> hm?
23:03 < kmeyer> well, len(array)/2 will never be greater than len(array),
and array[0:len(array)] is in-bounds, so, I think it's fine
23:03 < exch> even if len = 0, it'll just return an empty slice
23:04 < hard_shooter> but &array == &array[0:len(array)/2] ?
23:04 < kmeyer> wait, what are you trying to do?
23:04 < kmeyer> take half of the array?
23:04 < kmeyer> er, slice
23:04 < exch> the pointer bit is a bit weird.  slices are by reference
anyways.  They are just interfaces to an underlying fixed data structure
23:04 < kmeyer> hard_shooter: I think what you want is:
23:05 < kmeyer> array = array[0:len(array)/2]
23:05 < hard_shooter> If I use a slice as a parameter
23:05 < hard_shooter> will the function be able to modify the array ?
23:05 < kmeyer> yes.
23:06 < hard_shooter> k :)
23:06 < hard_shooter> good
23:06 < kmeyer> you're doing merge sort?  :P
23:08 < hard_shooter> probably
23:08 < hard_shooter> I don't really know the name of the algorithm
23:09 < hard_shooter> but well
23:09 < hard_shooter> seems that I merge arrays
23:09 < hard_shooter> ...
23:11 < hard_shooter> but I have some problems because I create arrays for
each level of recursion
23:11 < hard_shooter> and for 1 000 000 values
23:11 < hard_shooter> ...
23:12 < kmeyer> heh
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23:30 < hard_shooter> 5000 elements in 4.46 sec
23:30 < hard_shooter> on a dual core 2.5 ghz
23:30 < hard_shooter> and byte arrays
23:30 < exch> hope you don't use a lot of copy() calls, cos those are
insanely slow
23:31 < hard_shooter> I don't use copy
23:31 < exch> goodie
23:32 < sladegen> rewrite it in C and wrap it up with cgo...  problem
solved.
23:32 < hard_shooter> the goal is to pratice go :)
23:32 < hard_shooter> I don't know sorting performances...
23:34 < hard_shooter> Is this so bad ?
23:35 < exch> to be honest, I don't know.  But i've spent the past couple of
days optimizing a script tokenizer for speed and i'm counting Go performance in
nanoseconds.  So 4+ seconds seems like eternity :)
23:36 < exch> stil, if it teaches you about Go, then who really cares?  :p
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23:37 < sladegen> hectocore CPUs will take care of that slowdown.
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23:39 < hard_shooter> talking about performances :
23:39 < hard_shooter> go isn't very quick right now
23:40 < hard_shooter> It's just about implementation ?
23:41 < kmeyer> 4.46 seconds is a long time for 5000 elements of anything
23:41 < kmeyer> I'm betting it's your implementation that is slow
23:41 < kmeyer> go itself isn't terribly optimized yet, but even bad machine
code for a good algorithm will sort faster than that
23:41 < hard_shooter> I'm speaking globally :)
23:42 < hard_shooter>
http://shootout.alioth.debian.org/u32q/compare.php?lang=go
23:42 < kmeyer> for example, sorting 5000 lines of a file using bash sort:
23:42 < kmeyer> 0m0.018s
23:43 < kmeyer> which will be slower than your example, because it has to
read a file, split at newlines, etc
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23:43 < hard_shooter> I have to fill the array with random values :p
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23:47 < kmeyer> I took random values from /dev/urandom, it didn't take 4.45
seconds
23:49 < hard_shooter> maybe array length calculation...
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--- Log closed Sun May 09 00:00:56 2010