--- Log opened Mon Aug 02 00:00:05 2010
00:20 < napsy> gccgo
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00:24 < nickaugust> whats the difference between list and &list?  *list
would be a pointer right?
00:25 < KirkMcDonald> & is the address-of operator.
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00:28 < nickaugust> so I've read a dirctory with ioutils.ReadDir into var
'list' and now im looping over it with "for i:= range list" should I use 'list[i]'
or '&list[i]' to refer to that iteration?
00:31 < xb95> can't you just do "for _, val := range list { do something
with val }"
00:31 < xb95> and ignore the index entirely?
00:31 < xb95> unless you want it
00:32 < xb95> also, I assume list[i] returns the thing that is at position i
in the list
00:33 < xb95> whereas &list[i] returns the pointer to that position
00:33 < nickaugust> xb95: oh sweet that looks good.  i'll do it that way
00:33 < nickaugust> so the addres-of operator & is the same as a pointer?
00:33 < nickaugust> then whats *variable
00:33 < cbeck> Just remember that if you do _, val := range list, val will
be a copy of the item, not a reference to the item
00:33 < xb95> cbeck: oh, that's great to know, thanks.
00:33 < KirkMcDonald> nickaugust: Unary * is the dereference operator.
00:34 < nickaugust> ah
00:34 * nickaugust googles derefrence operator
00:34 < xb95> nickaugust: where dereference means 'take this address, turn
it back into the thing that I'm talking about'
00:34 < KirkMcDonald> nickaugust: Say you have this variable: var foo int
00:34 < nickaugust> so the oposite of a pointer?
00:34 < KirkMcDonald> nickaugust: &foo gives you the address of foo, and
gives you a value whose type is *int.
00:34 < KirkMcDonald> That is, a pointer.
00:35 < KirkMcDonald> So say you have: bar := &foo
00:35 < nickaugust> yes
00:35 < nickaugust> ok
00:35 < cbeck> nickaugust: The meaning depends on context
00:35 < KirkMcDonald> bar is a *int.
00:35 < KirkMcDonald> *bar dereferences the pointer, and gives you an int.
00:35 < nickaugust> yes ok i get it
00:35 < nickaugust> interesting
00:36 < KirkMcDonald> There is a distinction here between * as a type
modifier and * as a unary operator.
00:37 < nickaugust> how would it be used as a type modifier?
00:37 < KirkMcDonald> *int
00:37 < KirkMcDonald> The * modifies the int type.
00:38 < KirkMcDonald> Giving a new type: *int
00:38 < KirkMcDonald> Pointer-to-int
00:38 < nickaugust> ah yes.  as opposed to the return value of &foo which
would be *foo
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00:39 < KirkMcDonald> The return value of &foo is the address of foo, whose
type is *int.
00:39 < KirkMcDonald> *foo is not a thing.
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00:42 < nickaugust> KirkMcDonald: ok i think ive got it.  thanks man :)
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01:11 < smw> just curious: is there any ways to make plugins with go?
01:11 < exch> various
01:11 < smw> plugins == loadable pieces of code
01:11 < smw> how?
01:12 < exch> Go doesn't do dynamic linking, but you can use the IPC
approach.  plugins as independant processes that communicate with the main app
over a unix socket
01:12 < smw> ok
01:12 < smw> I guess you would use netchans for sending data?
01:13 < exch> You can do that, yes
01:13 < smw> ok
01:13 < smw> I guess latency is not an issue on localhost?  lol
01:14 < exch> Not particularly.  But (de)serialization of the data may cause
some slowdown.  Take care when designing the protocol
01:15 < smw> well, wouldn't netchans serialize it well?
01:16 < exch> Yes, but if you are sending more data than is necessary, it'll
still be slow than needed
01:16 < smw> ok
01:16 < smw> bottom line is, send as little data as possible
01:16 < exch> yup
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01:17 < smw> exch, thanks :-)
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01:18 < nickaugust> hey i'm trying to get some user input so im using scan
like this: "input, input_err := fmt.Scan()" but its not waiting for the input
before proceeding.  is this not the right way to use fmt.Scan?
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01:21 < exch> I think you need to use Scanln() for that.  Not sure though.
I've never used any of the scan functions
01:22 < nickaugust> ok i'll check that one out thx
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01:36 < xb95> okay, now that's fancy.  interface doesn't JUST declare
methods...  Foo interface { Name string } is satisfied by BarFoo struct { Name
string }...  just a struct with a field, not a method
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01:39 < xb95> BazFoo { name String }; func (self *BazFoo) Name() (string) {
return self.name } .......  also satisfies ...  but now you can do BarFoo.Name =
xx; but you can't do BazFoo.Name = xx; ..  maybe I should avoid that on the
grounds that it might be confusing later and limit use of interfaces arbitrarily
by assuming the structure of the underlying object
01:42 < nickaugust> what does it mean that Scanln takes "a ...inferface{}"
as an arg?  func Scanln(a ...interface{}) (n int, err os.Error)
01:43 < xb95> that means it takes 0 or more arguments of type interface{}
01:43 < xb95> and by type I mean, things that fulfill the 'interface{}'
declaration
01:43 < xb95> in reality this means 'give me 0 or more of anything.  doesn't
matter what it is.'
01:44 < nickaugust> im trying to get some user input...  im calling Scanl
with no args and its waiting for the input then when i hit enter it gives error
"expecting newline"
01:46 < xb95> you have to give it arguments
01:46 < xb95> that's where it puts the data
01:47 < nickaugust> i guess i need to read about interfaces
01:47 < exch> var a, b string; fmt.Scanln(a, b); <- user inputs "foo
bar"..  a will be "foo", b will be "bar"
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01:48 < nickaugust> exch: ah, ill try that.  thanks
01:48 < exch> Might have to pass &a and &b instead of straight up a and b
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01:54 < nickaugust> exch: yeah the pinters work.  thanks again man.
01:54 < nickaugust> s/pinters/pointers
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02:11 < xb95> so typically I'm used to writing single-threaded servers using
epoll.  the mailing list seems to say that using one (or more?) goroutines per
client is fine.  Go holds up OK even with 20,000+ goroutines?  I'd never even
consider making that many threads in any other environment :)
02:12 < smw> goroutines are much smaller than threads
02:12 < smw> of course I have no idea if it can handle 20,000 :-P
02:12 < Namegduf> Goroutines are about 4KB of stack and not much else.
02:13 < exch> goroutines != threads
02:13 < xb95> yeah, I know they're different.
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02:17 < nickaugust> so its seems silly to be doing this
http://sprunge.us/aQKD can I not just define the array as var input []string and
then just pass &input to fmt.Scanln.  I mean I know I cant do that because I
tried, but somthing similar ;)
02:22 < exch> the values don't have to be strings, It should be able to do
float, int, bool, etc in mixed order
02:24 < nickaugust> well the input is just names or comany names so strings
shuold work
02:24 < nickaugust> i just mean becaue i dont know how many search terms
there are ahead of time
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03:08 < xb95> hmm, I can't seem to find a way to convert a string to []byte.
searching shows strings.Bytes but that seems to have been removed since these
posts were made.
03:09 < xb95> []byte(string) maybe
03:09 * xb95 tries
03:09 < exch> that works
03:09 < xb95> heh
03:09 < xb95> it's the simple thing things.
03:10 < exch> reverse works as well
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03:26 < nickaugust> hey is there a function to concat arrays?
03:26 < smw> nickaugust, I don't think so
03:26 < nickaugust> or append to an array
03:26 < smw> nickaugust, you can use copy to append to an array
03:27 < nickaugust> like i have an array i need to append to the end of
another array
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03:27 < nickaugust> smw: ok thanks i'll check that out
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03:46 < nickaugust> how come I cant just do "search_words[len(search_words)]
= word" to append to an array?  it says list out of range
03:48 < smw> nickaugust, look into vectors
03:48 < nickaugust> smw: thx
03:48 < Makoryu> nickaugust: Probably because extending the length of an
array entails reallocating it.
03:48 < smw> container/vector I believe is the name of the package
03:48 < smw> it automates extending slices and reissuing arrays
03:48 < Namegduf> nickaugust: Because that isn't how computers work.
03:49 < Namegduf> You can't just write "after" a block of memory to make it
longer.
03:49 < Namegduf> There could be other stuff there.
03:49 < nickaugust> Namegduf: i understand that but there should be an
append function for arrays
03:49 < Namegduf> And a slice is a pointer (with length and capacity) to a
continuous block of memory.
03:50 < Namegduf> You can't append to a block of memory, so they don't have
an append function.
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03:50 < Namegduf> You can only emulate append, by reallocation
03:50 < smw> nickaugust, http://golang.org/pkg/container/vector/
03:50 < nickaugust> smw: im there now thx
03:50 < smw> nickaugust, np ;-).
03:51 < Namegduf> A vector is what you want, not a slice or array,
basically.
03:52 < nickaugust> smw: Namegduf: ah yes, here is my push and pop and all
the good stuff.  thanks!  :)
04:01 < Makoryu> nickaugust: You're coming from Python or Ruby, I take it?
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04:05 < nickaugust> ah, ive done a little of a lot of different languages..
none too exstensivly.  i've actually been re-writing the same application in
different languages of the past couple years.  but yes a good amount of python.  i
like python.  i also heard someone say he thought Go is what python should have
been.  so we'll see i guess :)
04:05 < nickaugust> Makoryu: ^
04:06 < Namegduf> Go does not have all of Python's goals
04:07 < nickaugust> well i assume Go is a lot more effecient because it
doesnt try to do all the pythonic stuff
04:07 < Namegduf> Particularly, it favours high performance over additional
capabilities that require less efficient structures.
04:07 < Namegduf> Yeah.
04:07 < nickaugust> yeah.
04:07 < nickaugust> heh
04:08 < nickaugust> thats good though.  i mean, theres going to be a
learning curve with any language.  might as well be a learning curve that makes
you think closer to what the machine is doing
04:08 < Namegduf> Yeah.
04:08 < nickaugust> weve just been abstracting on abstraction and were all
up in the frickin clouds with this shit.  time to get back to something simple.
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07:33 < xb95> hm, can't seem to find a way to coerce an interface{} to an
arbitrary type?
07:33 < KirkMcDonald> xb95: x.(T)
07:34 < KirkMcDonald> http://golang.org/doc/go_spec.html#Type_assertions
07:35 < xb95> yeah, that doesn't seem to do the trick...  it says,
07:35 < xb95> lib/BasicPipeline.go:98: invalid type assertion:
req.(http.Request) (non-interface type *Parcel on left)
07:35 < xb95> Parcel interface {
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07:35 < KirkMcDonald> xb95: It would seem you have a *Parcel, not a Parcel.
07:35 < xb95> oh hm, might have gotten it with some C-style extra parens
07:35 < xb95> (*foo).(http.Request)
07:36 < xb95> yeah, I was trying *foo.(http.Request) and that didn't work
07:36 < xb95> didn't think to try adding the extra parens
07:36 < KirkMcDonald> You probably want foo.(*http.Request)
07:37 < KirkMcDonald> Well, (*foo).(*http.Request)
07:37 < KirkMcDonald> Why are you using a pointer to an interface?  That
seems odd.
07:37 < xb95> Yeah, it's a terrible design.
07:37 < xb95> In this case, I'm going to restart the design, but I was
experimenting.
07:38 < xb95> panic: runtime error: invalid memory address or nil pointer
dereference
07:39 < xb95> good times.
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09:30 < araujo> is it possible to convert/cast an interface{} type that
contains an 'int' type, to a float ?
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09:34 < exch> you'll have to turn it into and int first, then a float
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09:47 < araujo> exch, the question is how?  ....  here it complains that I
cannot 'int(interfaceValue)'
09:47 < araujo> that I need a type assertion
09:47 < araujo> and with atype assertion, it turns into 0
09:47 < araujo> ...
09:48 < exch> If the interface value contains an int, v.(int) should work..
10:01 < vrtical> araujo: float(v.(int)) doesn't work?  (I haven't tried it)
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12:33 < manveru> heya
12:37 < manveru> how would you implement a sort function for a struct?
12:38 < nsf> make that struct implement sort.Interface
12:39 < napsy> manveru: here's an example
http://golang.si/doku.php?id=naiven_quicksort
12:39 < manveru> right now i have something like http://pastie.org/1070908
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12:42 < manveru> it's...  ugly :)
12:42 < napsy> it's a naive quicksort implementation
12:42 < manveru> not the quicksort
12:42 < manveru> my code
12:42 < napsy> oh
12:43 < napsy> what's that buublesort?
12:44 < manveru> no, a simple Person.lt(Person)
12:44 < manveru> i'll make sure to implement Sortable, but this function
still irks me
12:45 < manveru> 17: func (a Person) Less(b Sortable) bool { /* struktura
Person sedaj implementira vmesnik Sortable.  */
12:45 < manveru> 18: if a.age < b.(Person).age {
12:45 < manveru> why does it take Sortable when it casts to Person
afterwards?
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12:46 < napsy> because it has to implement my Sortable interface
12:47 < manveru> but it would give runtime errors when used on something
else?
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12:48 < napsy> yes
12:48 < napsy> the Less method is only for the Person structure
12:48 < napsy> you cant compare two incompatible objects anyway
12:49 < manveru> ok, makes sense :)
12:49 < napsy> can't *
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14:29 < delroybrown_> hello
14:29 < jessta> hello
14:30 < delroybrown_> was wondering if I can get some help with cgo
14:31 < delroybrown_> in particular if my C function takes an int pointer...
14:32 < exch> go ahead and ask.  If someone can help, I'm sure they will
14:33 < delroybrown_> so I have: func DriverGetVersion(driverVersion *C.int)
int { return int(C.cuDriverGetVersion(driverVersion)) }
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14:33 < delroybrown_> so now how do i go about testing this?
14:34 < delroybrown_> how can i declare a C pointer in my test.go?
14:35 < exch> With a function like that, you'll want to use Go types as
parameters..  So *int instead of *C.int.  Perform the conversions in the function
itself
14:36 < exch> external packages/apps will not be able to deal with the C.
bit
14:36 < delroybrown_> ah ok...
14:36 < exch> your test code can then simply pass the pointer to regular old
go int and not have to worry about what goes on behind the scenes
14:37 < delroybrown_> yes i see
14:37 < delroybrown_> ok let me try that then...
14:38 < plexdev> http://is.gd/dYpkg by [Nigel Tao] in go/src/pkg/image/png/
-- image/png: use image-specific methods for checking opacity.
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14:42 < delroybrown_> just trying to find how to to convert *int to *C.int
...
14:42 < exch> http://pastebin.com/g9vdNkE3
14:43 < delroybrown_> ah great thanks!
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15:05 < delroybrown_> so the other question i have is regarding C enums...
15:06 < delroybrown_> my C function actually returns a CUresult
cuDriverGetVersion(int *driverVersion);
15:07 < delroybrown_> where CUresult is an enum...  typedef enum
cudaError_enum {CUDA_SUCCESS = 0,...} CUresult;
15:08 < exch> That would just be an int or uint then
15:08 < delroybrown_> and I am just converting the the result to int in my
go func...  is this the correct way to do things...
15:08 < exch> yup
15:08 < delroybrown_> ok great
15:09 < exch> It's probably a good idea to check out some existing cgo
prjects to get a feel for what's going on.  Faster and probably clearer than
explaining it over irc :) There's a few here
http://go-lang.cat-v.org/library-bindings
15:09 < delroybrown_> BTW just working on getting cuda bindings for go
15:09 < delroybrown_> ok will have a look
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15:10 < delroybrown_> thanks again for all the help
15:10 < exch> np
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16:07 < nickaugust> is there a way to scan into a StringVector?
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16:12 < araujo> nickaugust, you mean ...  ??
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16:18 < nickaugust> araujo: "Scan: can't handle type: *vector.StringVector"
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16:19 < jessta> nickaugust: yeah, you can't
16:19 < nickaugust> so i'm having to do like this: fmt.Scanln(&input[0],
&input[1], &input[3], ...)
16:19 < nickaugust> when i dont know how many terms will be in the input
from the user
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16:20 < jessta> nickaugust: are they all strings?
16:21 < jessta> you could just read the the whole line and strings.Split()
it
16:22 < nickaugust> so if the user only puts in less than the predefined
number of search terms it sets err to "error: unexpected newline" and if they
enter more than the predifned number it sets err to "error: expected newline".
16:22 < nickaugust> doesnt crash the program but still not very pretty
16:22 < nickaugust> yes all strings
16:22 < nickaugust> so im defining it as a [10]string
16:22 < nickaugust> and using fmt.Scanln() to get the input
16:23 < nickaugust> i wasnt able to make Scan() work so i'm assuming
Scanln() is the proper way
16:23 < jessta> so, use bufio.ReadString('\n') instead
16:23 < nickaugust> jessta: ah, ok let me try that
16:23 < nickaugust> i didnt know about bufio
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16:41 < millertimek1a2m3> hey anyone there?
16:41 < millertimek1a2m3> let me know if you guys are receiving this
16:42 < exch> millertimek1a2m3: yup
16:42 < skelterjohn> your messages are getting through
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16:42 < millertimek1a2m3> ah!  thanks for telling me.  alright, so can
anyone give me a breif description of how well the windows support is going?
16:43 < millertimek1a2m3> brief*
16:43 < millertimek1a2m3> as in, does it work, and work completely orno
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16:43 < skelterjohn> i certainly cannot
16:43 < millertimek1a2m3> or no*
16:43 < skelterjohn> search the mailing list
16:43 -!- timmcd [~Timothy@174-23-142-201.slkc.qwest.net] has joined #go-nuts
16:43 < timmcd> Hey
16:43 < skelterjohn> hi
16:43 < millertimek1a2m3> yea...  the last I saw about the gomingw in the
mailing list was just a recent post on the new build...
16:44 < timmcd> Im trying to modify the 'go-readline' bindings, so that I
can have access to the rl_reset_line_state() function in readline/readline.h
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16:44 < millertimek1a2m3> I'd really like to be able to develop go on both
windows and linux
16:44 < skelterjohn> millertimek1a2m3: I bet if you tried what's available
and wrote about your experience, it would help the people who are developing it a
great deal
16:44 < smw> As far as I know, you would more be developing go on windows
than your program
16:45 < millertimek1a2m3> skelterjohn: ok, i will :)
16:45 < smw> although I think they have made alot of progress
16:45 < timmcd> So, when I try: http://gist.github.com/504928
16:45 < timmcd> I get the error that is also in that gist
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16:46 < timmcd> However, according to the gnu libreadline docs,
rl_reset_line_state is in fact a function, and its found in readline/readline.h
(which I include) via grep.
16:46 < smw> what command are you using to compile that program?
16:48 < timmcd> I'm just using the other guys Makefile (the one that came
with go-readline)
16:48 < timmcd> If you look at the gist again, I posted a comment
16:48 < timmcd> showing the makefile
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16:50 < timmcd> http://gist.github.com/504928 tjere
16:50 < timmcd> *there
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17:00 < timmcd> No idea?  :(
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17:14 < timmcd> I'm trying to add onto the go-readline binding, but this
function doesn't work.  I get the error shown in the gist.  Also, you can see the
makefile used in the comments for the gist.  http://gist.github.com/504928
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17:14 < timmcd> rl_reset_line_state is in fact a function in
readline/readline.h (which I am including)
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17:18 < wrtp> timmcd: my machine can't resolve gist.github.com.  any chance
of putting it on another server?
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17:19 < timmcd> Sure, uno momento por favor.
17:19 < timmcd> http://pastie.org/1071288
17:20 < timmcd> Thats the function I added onto the end of go-readline
17:20 < timmcd> (which just wraps readline() and add_history())
17:21 < timmcd> Does that work for you?
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17:23 < wrtp> readline.h on this machine doesn't seem to have
rl_reset_line_state
17:24 < wrtp> timmcd: have you checked that it exists on yours?
17:24 < skelterjohn> that would do it :)
17:24 < timmcd> Yeah, I have.
17:24 < wrtp> :-)
17:24 < timmcd> At least, it shows up to a grep xD
17:24 < wrtp> hmm, not here.
17:25 < skelterjohn> sometimes there can be multiple copies of a single
header on a particular machine
17:25 < timmcd> extern int rl_reset_line_state PARAMS((void));
17:25 < wrtp> the header says it's version 1.18
17:25 < timmcd> on line 372
17:25 < skelterjohn> maybe check that go isn't looking at a different
version of the header
17:25 < timmcd> How would i do that?
17:26 < timmcd> (new to the whole compiler/linker scene, usually a scripting
guy})
17:26 < timmcd> I'm using Readline 6.0
17:26 < skelterjohn> not sure what the best way is, actually
17:26 < timmcd> sayeth the header
17:26 < wrtp> hmm, this readline doesn't mention PARAMS, and only has 207
lines
17:26 < timmcd> '#define RL_READLINE_VERSION 0x0600 /* Readline 6.0 */'
17:26 < skelterjohn> could try moving the header to somewhere else
temporarily, and seeing if that breaks other stuff
17:27 < nickaugust> hm to define a new bufio.Reader i do this "var reader
bufio.Reader" right?  then the call is "input, err := reader.ReadString('\n')" but
I get this runtime panic http://sprunge.us/jjGY
17:27 < nickaugust> "panic: runtime error: invalid memory address or nil
pointer dereference"
17:27 < wrtp> looks like this is netbsd readline
17:27 < skelterjohn> nickaugust: bufio.Reader is an interface
17:27 < skelterjohn> you have to put something into it in order to read from
it
17:28 < timmcd> nickaugust: try in := bufio.NewReader(os.Stdin);
17:28 < nickaugust> skelterjohn: ok thanks man i'll read more about
interfaces.  i think thats what im not understanding.
17:28 < timmcd> Thats what I've used before.  THen: input, _ :=
in.ReadString('\n');
17:28 < skelterjohn> nickaugust: for instance, what is your reader supposed
to be reading from?
17:29 < nickaugust> just stdin
17:29 < skelterjohn> then you need to do what timmcd suggested
17:29 < timmcd> hmm
17:29 < nickaugust> im just trying to get some input from the user..  i
tried using fmt.Scanln but that didnt work they way i wanted
17:29 < skelterjohn> because saying "var reader bufio.Reader" doesn't say
anything about what you're reading from
17:29 < timmcd> It seems like this whole library is having an issue now
17:29 < timmcd> 'undefined _C_char'
17:29 < timmcd> from
17:29 < skelterjohn> a reader can be tied to a file, or stdin, or a network
socket
17:30 < timmcd> var p *_C_char;
17:30 < nickaugust> skelterjohn: yeah i was thinking that...  i thought it
might default to stdin
17:30 < skelterjohn> nickaugust: sorry, nope :) it defaults to "nil", as
your code indicates
17:30 < wrtp> timmcd: looks like rl_reset_line_state is non-portable.  if
you added it, then i wouldn't be able to use it on my machine...
17:30 < timmcd> Thats a shame.
17:30 < timmcd> See, the main problem is this: I'd like to have readline
support (very nifty indeeed), minimum of just add_history and readline(), which I
have.
17:31 < wrtp> skelterjohn: actually, it doesn't - nickaugust was using a
value instance.  it was probably an internal variable that was giving the panic
17:31 < timmcd> However, I am sending cursor movement terminal codes all
over the place in order to get a decent interface for my MUD client
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17:31 < timmcd> and readline doesn't seem to like that very much xD
17:31 < skelterjohn> wrtp: you're right - i made a bad assumption
17:31 < wrtp> timmcd: ah i see.
17:32 < timmcd> To see the code I was using before:
github.com/timmcd/goclient
17:32 < wrtp> your mud client is leaving the tty in a state that readline
doesn't expect
17:32 < timmcd> http://github.com/timmcd/goclient
17:32 < skelterjohn> down with muds that have complex curses interfaces =p
17:32 < wrtp> +1 :-)
17:32 < wrtp> down with curses full stop.
17:33 < timmcd> Not using curses
17:33 < timmcd> Using codes such as '\x1B[52;1H'
17:33 < timmcd> and such
17:33 < skelterjohn> ok, down with terminals trying to be GUIs
17:33 < timmcd> lol
17:33 < timmcd> Well, im simply trying to emulate tintin++
17:33 < wrtp> well, there's not much in the way of state in a tty.
17:34 < vrtical> wut, curses rocks!  No one here is using a *graphical* IRC
client are they?
17:34 < wrtp> just as long as you leave the cursor in the same place you
should be ok
17:34 < timmcd>
http://www.google.com/imgres?imgurl=http://i221.photobucket.com/albums/dd257/penquincoder/g1-tintin3.png&imgrefurl=http://forums.achaea.com/lofiversion/index.php/t38548.html&usg=__v0ALSAwrUxnYZ4ukCjOBbyvUb08=&h=320&w=480&sz=30&hl=en&start=0&tbnid=ZcrUNSuHS2bQHM:&tbnh=143&tbnw=215&prev=/images%3Fq%3Dtintin%252B%252B%26um%3D1%26hl%3Den%26client%3Dsafari%26sa%3DN%26rls%3Den%26biw%3D1086%26bih%3D872%26tbs%3Disch:10%2C21&um=1&itbs=1&iact=rc&dur=2
17:34 < timmcd>
qwFXTJfOL9CDngfXnu3WBQ&page=1&ndsp=16&ved=1t:429,r:11,s:0&tx=71&ty=66&biw=1086&bih=872
like that, with the little split bar at the bottom
17:34 < timmcd> lol thats a huge link
17:34 < timmcd> sorry xD
17:34 < wrtp> vrtical: i haven't used a vt100 clone for years
17:35 < wrtp> big URL for tiny image!
17:38 < timmcd> So hmm
17:38 < timmcd> Does readline work well with ncurses/curses?  Or is there a
similar library that allows for nice movement (left-right arrows plus emacs-like
movement) and history?
17:39 < nsf> timmcd: readline should work well with ncurses, but it depends
on current terminal mode, etc.
17:40 < timmcd> mm
17:40 < timmcd> thanks
17:41 < nsf> unfortunatelly readline is the only library of that kind :( I
wish there was a lib like readline but untied from input and output
17:41 < timmcd> yeah
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17:44 < nsf> btw
17:44 < nsf> curses sucks
17:44 < nsf> :)
17:44 < timmcd> xD
17:44 < timmcd> Well, what else do you suggest for a terminal-based
mudclient?
17:44 < wrtp> timmcd: maybe you could use rl_forced_update_display
17:44 < timmcd> or writing a mudclient in Go at all?  lol
17:44 < timmcd> wrtp: The plan of using reset_line_state
17:44 < nsf> http://code.google.com/p/termbox/
17:44 < ptrb> timmcd: go has ncruses bindings that were recently updated
17:44 < timmcd> Was to reset the line when input came in
17:44 < timmcd> so it didn't get all garbled
17:44 < ptrb> oh, I did not read the history
17:44 < nsf> but this one won't work with readline at all
17:44 < timmcd> ptrb: I know, I updated them ;)
17:45 < ptrb> <- d'oh
17:45 < timmcd> lol
17:45 < nsf> and of course I'm suggesting it because I wrote it
17:45 < nsf> (has Go bindings) :D
17:45 < timmcd> lol
17:45 < timmcd> How difficult/easy would it be to implement my own
text-editing nifties?
17:46 < timmcd> such as moving back and forth on the line with custom
bindings
17:46 < ptrb> most curses UIs do it (in C[++]) with a little effort
17:46 < nsf> well termbox works as a dumb gui toolkit
17:46 < wrtp> nsf: how does termbox cope when the cursor has been moved
without its knowledge?
17:46 < skelterjohn> timmcd: it's just a matter of sending the right
character to the terminal, isn't it?
17:46 < wrtp> or does it always use absolute cursor positioning?
17:46 < nsf> it has event on input and you draw characters on the screen
wherever you want
17:46 < nsf> you can as termbox to show cursor somewhere too
17:46 < nsf> or hide it
17:47 < nsf> ask*
17:47 < timmcd> hrm
17:47 < nsf> wrtp: it grabs terminal fully
17:47 < nsf> uses raw mode
17:47 < timmcd> Is it possible, then, to detect just when the user hits a
combination of keys in the terminal (esp.  with termbox?)
17:47 < timmcd> not just when they hit enter
17:47 < timmcd> ?
17:47 < wrtp> nsf: what happens if you wanna use it with readline?
17:47 < nsf> so you can't move cursor without termbox knowing that
17:47 < nsf> wrtp: I said earlier
17:47 < nsf> it won't work with readline
17:48 < nsf> timmcd: nope, but it's fairly easy to write that kind of thing
17:48 < nsf> especially in Go
17:48 < timmcd> Oh? How so?
17:48 < nsf> termbox is very dumb and small
17:48 < nsf> timmcd: use a buffer and a timer
17:48 < timmcd> it looks like your keyboard demo there (the screenshot
atleast) captures key presses, not just on enter
17:48 < nsf> or what do you mean by combination?
17:48 < nsf> alt+ctrl+y?
17:48 < timmcd> as in, shift-k
17:49 < timmcd> ctrl-a
17:49 < timmcd> etc.
17:49 < nsf> terminal itself has a lot of problems with that
17:49 < nsf> you see it doesn't recognize key presses and such
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17:49 < nsf> terminal works with stream of input characters
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17:49 < nsf> some of them form special sequences that can be recognized as
weird combinations
17:49 < nsf> like shift+space
17:49 < nsf> but not all terminals support that
17:50 < timmcd> yeah
17:50 < wrtp> timmcd: basically, AFACS the answer is: character-addressing
libraries don't combine well
17:50 < nsf> I have a file explaining what works with termbox
17:50 < nsf> one sec
17:50 < wrtp> s/AFACS/AFAICS/
17:50 < nsf> http://github.com/nsf/termbox/blob/master/NOTES
17:50 < nsf> here it is
17:51 < nsf> I didn't go ncurses way (support everything and let user know
if something is available or not)
17:51 < nsf> I've gathered major part of keys and combos that work on all
popular terminals
17:52 < nsf> as well as displaying capabilites
17:52 < nsf> capabilities*
17:52 < nsf> and I think it's enough to build a good interface of any kind
:)
17:52 < timmcd> Hmm
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17:52 < timmcd> It looks like termbox does do what I was asking...
tb_poll_event/peek_event?
17:52 < timmcd> They sit and wait for a keyboard event?
17:53 < Namegduf> Yes.
17:53 < nsf> yes
17:53 < timmcd> What I was asking is...  is it possible to detect keypresses
when they happen, not till they hit enter.
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17:53 < nsf> and check the go bindings
17:53 < nsf> http://github.com/nsf/termbox/blob/master/go/example.go
17:53 < nsf> you can do that in a separate goroutine actually
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17:53 < timmcd> Ok nice
17:53 < timmcd> termbox may actually be what I use.
17:54 < nsf> well it will be nice if it will work for you
17:54 < timmcd> Does it support scrolling text regions?
17:54 < nsf> it's not really a popular lib, so maybe it will have some
issues
17:54 < nsf> like portability
17:54 < nsf> timmcd: nope
17:54 < timmcd> hrm
17:54 < timmcd> that could be an issue
17:54 < nsf> you'll have to implement it by yourself
17:55 < nsf> it's not that hard with fixed-width-character layout
17:55 < nsf> well..  and height :)
17:55 < timmcd> lol
17:56 < nsf> and frankly without having a notion of pixel at all
17:56 < nsf> :D
17:56 < nickaugust> what 'unicode codepoint' do i pass to
strings.TrimRight() to trim new line char?  I tried U+2028 and the string '\n\..
any ideas?
17:58 < nickaugust> thats "\n" not "\n\ of course :)
17:58 < nickaugust> oh nevermind "\n" does work.
17:58 < nsf> \n should work, but different OSes use different characters of
newline
17:59 < nsf> like \r\n or simply \r
17:59 < nsf> ah..  ok :)
17:59 < nsf> the best part of utf-8 is that it is backwards compatible with
ascii
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18:00 < nickaugust> nsf: oh did you write termbox?  i've been looking at
that it seems much for fun than writing for ncurses!
18:00 < nsf> nickaugust: yep, it's me
18:00 < nsf> although I've never written any app with it
18:00 < timmcd> nsf: Would you say termbox is capable of writing a roguelike
in?
18:00 < nsf> and I think I can't consider library as "done" if there is no
app which uses that lib
18:01 < nsf> timmcd: sure, why not
18:01 < timmcd> nsf: groovy
18:01 < nickaugust> im all about the command line interfaces..  i usually
just 'let it scroll' as they say because I never wanted to deal with ncurses..  so
terbox is exciting
18:02 < nickaugust> xwindows, the framebuffer, ncurses...  that stuffs so
complicated
18:02 < nsf> nickaugust: not sure what you mean, but yeah, I like simplicity
too
18:03 < nsf> in fact termbox is inspired (surprise!) by console window in MS
Windows
18:03 < nsf> :)
18:03 < nickaugust> is there any framebuffer libs for go?
18:03 < nickaugust> ms windows yikes :P
18:03 < nsf> windows, yes..  but their console window API is very nice :)
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18:13 < nickaugust> ok sweet everying is working perfect and looking pretty
with bufio instead of fmt.Scanln :)
18:13 < nickaugust> is there a way to watch for ^[[A, ect to load command
history?
18:13 < nickaugust> err an input history
18:14 < nickaugust> however youd say
18:15 < timmcd> Readline ;)
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18:16 < nickaugust> im reading like this reader.ReadString('\n')...  which
is watching for \n obviously...  can I have multiple readers listining to stdin at
the same time?
18:17 < nickaugust> maybe im getting ahead of myself
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18:26 < skelterjohn> nickaugust: i think that having multiple readers on
stdin is asking for trouble
18:27 < skelterjohn> if you want to split it, do so explicitly by having a
single reader on stdin that will then do the splitting for the other things that
want it
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18:31 < skelterjohn> for instance, the splitter could send every message to
each of the recipients, or send each message to only one recipient, chosen by some
method
18:32 < wrtp> nickaugust: you could easily create a function that takes a
Reader and a Writer and returns a Reader.  Every time data is read, it is also
written to the Writer.
18:32 < wrtp> then you could create a Writer to do whatever you want with
the data
18:32 < wrtp> look at io.MultiReader for inspiration
18:33 < skelterjohn> wrtp: did you ever have any luck with my os x/X11
issue?
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18:33 < skelterjohn> it turns out it can be recreated with a two line
program that just tries to call x11.NewWindow()
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18:34 < skelterjohn> i created an issue, and they said that os X's x11
implementation is kinda janky (my words) and that if I find someone else with the
problem i should re-open the issue
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18:52 < nickaugust> how can I print columns that will line up correctly?
i'm tyring to add '\t's with fmt.Printf but its not working out
18:52 < nickaugust> is there a package for printing columns or tables
18:52 < nickaugust> ?
18:52 < skelterjohn> fmt.Printf abides by all the width restrictions that
the C function printf abides by
18:53 < nickaugust> skelterjohn: ok thx
18:53 < nickaugust> ill see if i can find some info on that
18:53 < skelterjohn> so you can specify the width of format parameters
18:53 < skelterjohn> something like %7d would be a digit taking up 7 spots
18:53 < skelterjohn> but it might not be that exactly
18:53 < skelterjohn> i don't have it committed to memory
18:54 < nickaugust> gotcha.  thanks man
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19:01 < KirkMcDonald> Does %*d work?
19:01 * KirkMcDonald checks.
19:02 < KirkMcDonald> Hmm, docs don't mention it.
19:07 < skelterjohn> works, though.  just checked.
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19:12 < nickaugust> ok this is looking sweet now :) is it simple to add
color when printing to stdout?  what should i research to do that?
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19:13 < skelterjohn> http://lmgtfy.com/?q=terminal+color+codes :)
19:13 < nickaugust> skelterjohn: thx
19:13 * skelterjohn waits for it
19:14 < nickaugust> hehe
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19:14 < nickaugust> i dont see any advertisments though because im using
links2 :)
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19:15 < skelterjohn> not sure what you're talking about with advertisments
19:15 < nickaugust> or js :/ but i get the point
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19:15 < skelterjohn> ah
19:15 < nickaugust> oh 'let me google that for you'...  hehe ive seen that
before..  an animation of typing in the google box right?
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19:16 < nickaugust> hmm..  i dosnt even forward me to the google results.
19:16 < nickaugust> damnit skelterjohn
19:16 < nickaugust> i guess ill do it myself ;)
19:16 < skelterjohn> haha
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19:40 < nickaugust> wrtp: ah thats a good idea.  then i can monitor every
keypress.  thanks man!
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19:42 < raylu> nickaugust: it does forward you to the google results after a
bit
19:42 < skelterjohn> raylu: not if javascript is disabled
19:42 < raylu> oh =\
19:45 < nickaugust> javascript.  blah.
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20:15 < nickaugust> how can I create a reader for stdin that will fire on
every keypress rather than \n?
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20:17 < nickaugust> or does it not work like that
20:17 < skelterjohn> os.stdin is an instance of *os.File, which a receiver
to a method "func (file *File) Read(b []byte) (n int, err Error)"
20:18 < skelterjohn> if you pass it a byte slice with length 1, maybe it
would read one byte
20:18 < skelterjohn> i haven't tried this
20:18 < nickaugust> hm i'll try that
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20:21 < skelterjohn> i'm interested to know if that works like you want
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20:40 < nickaugust> skelterjohn: hm it looks like it might work but it
doesnt pause and wait for the input
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20:41 < skelterjohn> so it will return (0, nil) many times?
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20:44 < nickaugust> its hard to tell..  it actually prints %v
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20:44 < nickaugust> EOF0
20:44 < nickaugust> %v then EOF0 on a newline
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20:44 < skelterjohn> that doesn't make sense to me
20:45 < skelterjohn> calling .Read causes EOF0 to be printed?
20:45 < nickaugust> hehe..  hold on let me look closer
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20:46 < skelterjohn> are you writing: fmt.Printf("%v", stdin.Read(myBuffer))
20:46 < nickaugust> maybe thats my error catch screwing up.  im calling
os.Stdin.Read(arrayOfOne)...
20:46 < skelterjohn> because stdin.Read has a multiple return value
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20:48 < nickaugust> skelterjohn: yeah i was doing this: if input_int, err =
os.Stdin.Read(arrayOfOne); err != nil {
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20:49 < nickaugust> but then i think my error handling is not right
20:49 < nickaugust> fmt.Fprint(os.Stderr, "%v\n", err)
20:49 < nickaugust> i think thats where that %v is coming from
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20:49 < skelterjohn> Fprintf is what you need, maybe
20:50 < skelterjohn> instead of Fprint
20:50 < skelterjohn> the last 'f' is for 'formatted'
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20:51 < nickaugust> see if I add os.Exit(1) to the error catching it just
prints: Contact Search: %v and then exits
20:51 < nickaugust> let met try Fprintf
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20:52 < nickaugust> just by replacing Fprint with Fprintf I get: "Contact
Search: EOF " and then exits
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20:53 < skelterjohn> then stdin gave you an eof for whatever reason
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20:53 < nickaugust> yeah so its returning error: EOF
20:53 < skelterjohn> (end of file).  it's telling you there is no more data
to read in stdin
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20:54 < nickaugust> yeah...  i need it to pause so i can give it some!
20:54 < nickaugust> bloody thing :)
20:54 < skelterjohn> not sure what the best way is to do this
20:54 < skelterjohn> busy waiting is bad form
20:54 < nickaugust> yeah
20:55 < skelterjohn> maybe someone else in the channel will have a
suggestion.
20:55 < nickaugust> hmm ok i'm going to play with this some more in the mean
time
20:55 < nickaugust> skelterjohn: thanks for all your help
20:55 < skelterjohn> my pleasure
20:55 < skelterjohn> takes my mind off of grading this very large pile of
stupid in front of me
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20:55 < skelterjohn> ie undergrad midterms
20:57 < nickaugust> ah youre a prof??  computer sciences?
20:58 < skelterjohn> grad student
20:58 < skelterjohn> profs don't grade midterms here ;)
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20:58 < nickaugust> aaah :)
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21:10 < nickaugust> yeah it would also be nice to watch for \t to do
autocompletion
21:10 < nickaugust> and ^[[ for history
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22:18 < plexdev> http://is.gd/dZ24N by [Rob Pike] in go/src/pkg/io/ -- io:
consolidate multi_reader and multi_writer into a single file, multi.go
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