--- Log opened Sat Sep 25 00:00:07 2010
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00:14 < plexdev> http://is.gd/frmP9 by [Ian Lance Taylor] in
go/test/fixedbugs/ -- test: Add test which causes incorrect error from gccgo.
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01:21 < exch> durr.  utf16.Encode() returns a slice of uint16 codepoints.
No hassle with runes needed
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02:26 < enferex> why hello jhawk28
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02:44 < jhawk28> enferex: hello
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02:58 < scyth> can slices be a regular element inside struct?
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03:57 < uriel> scyth: sure, why wouldn't they?
03:57 < scyth> uriel, yeah..  figured it out by now
03:57 < scyth> btw, any examples on simple udp client/server?
03:58 < scyth> or tcp ..  for that matter
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04:05 < uriel> see under net/ package
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04:05 < uriel> eg., net/dict
04:05 < uriel> (not sure about udp)
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08:49 < fenicks> hello
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09:03 < virtualsue> hello :)
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11:36 < plexdev> http://is.gd/fsnBM by [Alex Brainman] in
go/src/pkg/syscall/ -- syscall: add IPPROTO_IPV6 and IPV6_V6ONLY const to fix nacl
and windows build
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11:49 < napsy> Hello.  How do I use the gopprof profile on my go program.
Do I have to specify any flags when compiling?
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13:19 < wjlroe> How do you assign a new variable to the contents of another
variable, while overriding a field in a struct?  something like: second :=
first{a: 2}
13:20 < wjlroe> assuming first := &First{}
13:20 < nsf> second := first; second.a = 2;
13:22 < wjlroe> ok - is there no combination of those expressions?
something akin to erlang's copying of a record while overriding values?
13:22 < nsf> no
13:22 < wjlroe> ok thanks
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14:12 < wjlroe> http://pastebin.org/1188060 <- I'm getting panic: runtime
error: invalid memory address or nil pointer dereference when I try to receive
from r.tunnel (line 32)
14:15 < wjlroe> er no, http://pastebin.org/1188300 <- I have now
initialised the channel, but I'm getting invalid memory address when I try to
print on line 34
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14:24 < wjlroe> the source and output: http://pastebin.org/1188617 I seem to
get the crash when I send the first message to the channel of the first element in
the array - can anyone see what I've done wrong?
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14:50 < Tv> wjlroe: you make the .tunnel channel in a goroutine, what if
that doesn't get run until after the .tunnel <- first_msg
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14:53 < Bombe> Yes, that might be a threading issue.
14:54 < Bombe> wjlroe, try creating the tunnels before calling listen().
14:54 < wjlroe> ok, so now (making the tunnel before launching the listen()
) - I get this ol' chestnut : throw: all goroutines are asleep - deadlock!
14:55 < wjlroe> I'm gonna have to close() the channel(s) somewhere..
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15:49 < wjlroe> http://pastebin.org/1190140 <- I'm not sure where I have
to close channels - can anybody point out where I'm going wrong?
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15:53 < Bombe> Hmm, are you sure the nextlink fields are initialized
correctly?
15:53 < wjlroe> not certain :)
15:53 < Bombe> I could probably answer that myself if I actually knew Go. :)
15:54 < wjlroe> haha
15:54 < Bombe> Does the make() in line 56 actually create Ringlink objects
or just the array?
15:54 < wjlroe> it makes the objects - which is why you can set .tunnel and
.fakething etc.
15:55 < Bombe> Yes, you are right.
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17:46 < scyth> I'm trying to parse an xml message of variable format.  The
format itself is like this: <start> <main> <type> TypeX
</type> </main> <data> ...structure here depends on "TypeX"
...</data> </start>
17:47 < scyth> so I need to get the "main" portion to be able to select
different structures for "data" part
17:48 < scyth> any ideas how to "unmarshall" or whatever, only the "main"
portion?
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18:07 < exch> I would probably parse it manually in this case using the
tokenizer in the xml package
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18:13 < scyth> ok
18:15 < Bombe> wjlroe, I have managed to get a version that does not
deadlock anymore but it still does not do what it’s supposed to do.
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18:19 < scyth> also, I'm trying to get a string to io.Reader why can't I use
strings.NewReader(s)?  It returns *Reader ..  but functions are expecting
io.Reader and not strings.Reader
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18:20 < scyth> bytes.NewBufferString() works though
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18:28 < scyth> damn..  I'm lost
18:30 < wjlroe> Bombe: oh really?  how?
18:32 < Bombe> wjlroe, I changed the loop in :45 to what it looks like in
:59.
18:32 < Bombe> But as said, that still doesn’t really work.
18:33 < wjlroe> I don't understand the difference
18:34 < Bombe> I thought it has something to do with value vs reference.
18:34 < Bombe> Also, when creating the channel with make(chan *Message, 1)
it also does not deadlock but also does not work.
18:35 < Bombe> Go is obviously not my language of choice but I am intrigued
by it.  :)
18:35 < wjlroe> ok, yeah it seems that because I don't close the channels
properly, the goroutines deadlock
18:36 < wjlroe> but it's not clear when they deadlock or what's at fault
18:36 < Bombe> Theoretically at least one goroutine should wake up when the
first message is sent.
18:36 < Bombe> Which would in turn wake up another.  And so on.
18:37 < Bombe> So, why doesn’t the first message wake up the first
goroutine.
18:37 < wjlroe> I don't think the error message is that informative - it's
most likely a race condition, rather than that the goroutines are "asleep",
whatever that means
18:39 < wjlroe> it could be becase I start each goroutine then send the
first message - that the first message hits the first goroutine before the second
goroutine has started receiving
18:39 < Bombe> Also, I do have a problem with the Ringlink objects created
in :56.
18:40 < Bombe> Hmm… a send to a channel will block until there’s a received
so the main thread should simply be waiting for the first goroutine to come up.
18:41 < wjlroe> yeah, I don't understand it - I thought this would be easy
given how simple it is in erlang
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18:42 < napsy> I doubt go and erlang are comparable
18:42 < wjlroe> no indeed
18:42 < wjlroe> but in terms of message passing, there is some commonality
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19:59 < Bombe> Hmm.
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20:06 < Bombe> Hmm.
20:08 < Bombe> type Test { int i }; func main() { tests := make([]Test, 5);
for i, test := range tests { test.i = i; }; for _, test := range tests {
fmt.Println(test.i); }; }
20:08 < Bombe> This does not print 0, 1, 2, 3, 4 as I would expect it to.
20:09 < napsy> Bombe: it's type Test { i int }
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20:11 < cbeck> Bombe: test in your range clause will be a copy of Test[i],
rather than a reference to it
20:11 < cbeck> err, tests[i]
20:12 < Bombe> I figured that much.  Is there a way to get a reference
instead of a copy or do I have to use tests[i]?
20:12 < cbeck> use tests[i] or make tests []*Test
20:12 < Bombe> napsy, yeah, it is in the source, I just typed it wrong here.
:)
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20:14 < Bombe> cbeck, okay, so after make([]*Test, 5) I have to create 5
Test objects and assign them to the slice?
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20:15 < cbeck> Yes, which you can do with for i := range tests {
20:15 < cbeck> tests[i] := &Test{i}}
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20:16 < Bombe> Okay, but now if I want to use the “tests” object as a
function parameter I have to change all method signatures to []*Test instead of
[]Test, right?
20:18 < mpl> say, if I do foo := make([]string, m); work with foo[i]; foo =
make([]string, n); does the garbage collector take care of freeing whatever I had
put in foo initially?
20:19 < cbeck> Bombe, right, so it's probably best to just do tests[i] = foo
20:20 < cbeck> It just depends on your use case
20:20 < cbeck> mpl: yes
20:20 < Bombe> cbeck, I don’t really have use cases yet, only test cases.
:)
20:20 < mpl> cbeck: kthx
20:21 < Bombe> cbeck, so the second return value of the range expression is
(always?) a copy of the element in question, so it should only used for read-only
access?
20:21 < cbeck> Bombe: Fair enough.  My experience is that working with
pointers is so easy and streamlined in Go, that I use them pretty much everywhere
20:21 < cbeck> Bombe: Yes
20:22 < cbeck> Obviously if the struct has a field which is a reference or
pointer type, then you may be able to modify the original, but in general if you
need to modify it, just use the single value version of range and index in
20:23 < Bombe> cbeck, okay.  Thanks for clearing that up.  :)
20:25 < cbeck> anytime
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20:27 < scyth> if I have buf []byte, passed as an argument of type io.Reader
to my function, how can I copy that buf to another one?
20:27 < Bombe> wjlroe, I think I just realized why your problem exists.
20:27 < Bombe> wjlroe, after sending the message to the first link’s
channel, the main thread is done and exits the program.
20:30 < cbeck> scyth: Depending on what you need, check out io.Copy() or
type assertions http://golang.org/doc/go_spec.html#Type_assertions
20:32 < cbeck> If you want your main thread to sleep permanently you can use
an empty select statement and call os.Exit(int) elsewhere, or you can create a
'done' channel and have main wait on a read from it
20:32 < cbeck> err, s/thread/goroutine/
20:33 < wjlroe> Bombe: oh right, yes that's most likely it
20:34 < Bombe> wjlroe, yes, it is, I managed to get it working.  :)
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20:35 < wjlroe> Bombe: how did you get it to work?
20:36 < Bombe> wjlroe, http://pastebin.org/1193096
20:36 < Bombe> wjlroe, I added the “quit” channel in the message that gets
set in start().
20:37 < Bombe> wjlroe, and you have to iterate differently over the links to
call the listen() method.
20:37 < Bombe> wjlroe, because, as I know now, the iterated-over value is a
_copy_ of the value in the slice.
20:37 < wjlroe> oh
20:37 < Bombe> wjlroe, so you started the listen() method on one object but
sent the message to the channel of a _different_ object.
20:38 < Bombe> And there’s your deadlock.  :)
20:38 < scyth> cbeck, sorry, I still don't understand.  for io.Copy() I
don't understand how to create empty dst
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20:39 < wjlroe> Bombe: ok, that did it - also I tried using an empty select
{} to wait for the os.Exit() to be issued in the last message
20:39 < wjlroe> rather than a quit channel
20:39 < wjlroe> but either way works
20:39 < scyth> cbeck, Why can't I just mydst := make([]byte, 1024) and do
io.Copy(mydst, mysrc) if "mysrc" is io.Reader
20:40 < Bombe> wjlroe, I think a quit channel is conceptually a lot clearer.
20:40 < wjlroe> Bombe: yeah, it's not often you'd call Exit like this
20:40 < cbeck> Also more idiomatic
20:40 < Bombe> True..
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20:41 < cbeck> scyth: Really quick, are you trying to recover the []byte
wrapped in the reader, or are you trying to copy them?
20:42 < scyth> cbeck, copy
20:43 < wjlroe> Bombe: thanks a lot!
20:43 < scyth> cbeck, because I realised, xml.Unmarshall() removes content
from io.Reader ..  and I need to make two calls with same content.
20:43 < cbeck> scyth: Ahh, gotcha
20:43 < cbeck> One sec
20:44 < Bombe> wjlroe, no problem.  Nice little problem for me to busy
myself with Go once again.  :)
20:44 < wjlroe> Bombe: it's a good one - from the programatic programmers
Programming Erlang :)
20:45 < Bombe> :)
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20:54 < cbeck> scyth: Perhaps something like raw, err :=
ioutil.ReadAll(reader); rawCopy := raw[:]
20:55 < cbeck> If you want to pass those to something that takes an
io.Reader you'll need to wrap them in a bytes.Buffer
20:55 < cbeck> There's probably an easier way, but it's not occuring to me
21:01 < scyth> oh
21:02 < scyth> cbeck, any idea why bytes.ReadFrom() and other functions also
delete all the contents from source buffer?
21:07 < scyth> also..  moving things around to match specific interface
(io.Reader, strings.Reader, bytes.Reader....) is really a pain in the ass..
slowing me down completely
21:08 < scyth> large amount of library functions take specific interfaces as
arguments...  and of course, they differ
21:09 < cbeck> They pretty much all take io.Reader, at least as far as I can
see
21:09 < scyth> or bufio.Reader :)
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21:10 < cbeck> What requires a bufio.Reader?
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21:19 < scyth> nothing, my bad
21:19 < scyth> btw, the above solution worked
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22:27 < crazy2be> anyone here worked with the json package before?
22:28 < exch> yes
22:30 < crazy2be> I'm still having trouble getting it to fill my data
structures...  I have made all my fields start with a capital so that the JSON
package can see them properly now
22:30 < crazy2be> but it doesn't seem to be properly filling all of the
fields, only some
22:31 < exch> Do you have an example?
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22:33 < crazy2be> uuuh, right.  testcase.  Do you know if the json package
is at all case sensitive?  I didn't see that mentioned in the docs, and it
evidently fills some fields that start with capital letters (since otherwise they
are not exported)
22:33 < exch> it shouldn't be case sensitive
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22:35 < crazy2be> I'm feeding it a atom feed from picasa
22:36 < crazy2be> *an
22:37 < exch> it's hard to say what could be wrong without seeing what
you've done.  It's either some of the structs/fields which are misdefined or the
feed is just broken
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22:42 < cbeck> pastie the raw feed and your struct?
22:42 < crazy2be> hmm i think that the problem is, the json library will not
fill []interface{} values if there is only one item in the JSON array
22:43 < crazy2be> I was testing with a different JSON feed and it would fill
the Text fields on that one
22:43 < crazy2be> now i'm using an example one and nothing gets filled,
likely because there is only one album
22:43 < crazy2be> sec
22:44 < crazy2be> Here's the JSON: http://pastie.org/1181713
22:45 < crazy2be> And here is the struct: http://pastie.org/1181717
22:45 < crazy2be> Note that the JSON is modied as shown there...  "normal"
picasa feeds have $ signs in variable names
22:48 < crazy2be> hmm..  the problem could actually lay with my replacer
code
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22:50 < crazy2be> The $ are kind of a tricky thing to deal with
22:50 < crazy2be> originally i was replacing them with _, but there are some
fields that would not get exported then
22:51 < crazy2be> because they would start with an _
22:51 < crazy2be> so then i changed it to an empty string
22:51 < crazy2be> but since i cast it to a []byte in my replacer code, that
gets changed to a null
22:52 < crazy2be> and then the JSON code is complaining
22:52 < cbeck> That could cause issues, certainly
22:52 < cbeck> Hmm
22:52 < cbeck> Replace it by a space?  json isn't whitespace sensitive
22:53 < crazy2be> I'm just using the regex package to do the replacing, with
a wrapper so that it works with the io.Reader i get from http.Open
22:53 < cbeck> As long as all the $ are at the start of vars, of course
22:54 < crazy2be> cbeck: that's what i figured, but it's not unmarshaling
into the " t" values still
22:54 < crazy2be> and the $ are sometimes in the middle as well...
22:54 < cbeck> Bah
22:55 < cbeck> Replace by an upper case S?
22:56 < crazy2be> that seems to work, although it's not the most
straightforward solution :P
22:56 < crazy2be> Thanks!
22:57 < crazy2be> Can't believe i didn't think of it sooner :P
22:57 < crazy2be> s/sooner/myself :P
22:57 < cbeck> It seems like a fragile solution, but the webs are full of
those =p
22:57 < crazy2be> heh
22:58 < crazy2be> why doesn't go allow $ in variable names?
22:58 < crazy2be> Just wondering, because i didn't see a use for it anywhere
in the spec
23:01 < skelterjohn> because it is in the C syntax family
23:02 < crazy2be> Well i never even considered it until i started using
jQuery, and then i noticed that it's fine in javascript
23:02 < skelterjohn> javascript is an abomination
23:03 < crazy2be> of the C syntax, or just in general?  :P
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23:03 < nbjoerg> well, it's not alphanumeric
23:04 < nbjoerg> nor does it is the space-replacement like _
23:04 < nbjoerg> so why allow it?
23:04 < crazy2be> I guess why allow/why deny
23:05 < skelterjohn> deny because it is usually denied
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23:05 < skelterjohn> if they had allowed it in C, it probably would have
been allowed in more other languages too
23:05 < crazy2be> but then people can't write php-like $blah = "bllah"
23:05 < skelterjohn> but, in general, the symbols on the top of number keys
are not allowed in identifiers
23:05 < crazy2be> which is likely a good thing :P
23:06 < ProNihilist> deny because it's ugly
23:06 < crazy2be> well, most of the symbols have a user
23:06 < crazy2be> *use
23:06 < skelterjohn> and it's ugly because it's unfamiliar
23:06 < crazy2be> although not @ and # i suppose
23:07 < skelterjohn> in the end there are many language decisions that are
arbitrary.
23:07 < crazy2be> Unless # is a comment in go...  I don't think it is
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23:07 < cbeck> It isn't
23:07 < ProNihilist> but it's an arbitrary decision that adds 2 needless
keystrokes onto every variable name, that kinda adds up
23:07 < crazy2be> but having # would be a bad idea for that reason
23:07 < crazy2be> Well, i've always wished i could use - in variable names
23:08 < crazy2be> it's the fastest to type
23:08 < crazy2be> much faster than _
23:08 < skelterjohn> counting keystrokes is not a useful thing to do, in my
opinion
23:08 < crazy2be> and potentially faster than uppercase
23:08 < nbjoerg> my preference is still to just use digits for variable
names and switch to base 26 for numberic literals
23:08 < nbjoerg> so much less ambigious
23:09 < nbjoerg> I know it requires a bit getting used to to write 1 for the
loop variable and not i, but that's just a matter of time
23:09 * skelterjohn wishes there were a nice go debugging tool available
23:09 < crazy2be> well, - is commonly used in variable names outside of
programming, e.g.  css
23:09 < nbjoerg> skelterjohn: it's called print
23:09 < crazy2be> or println, or fmt.Printf, or...
23:09 < skelterjohn> thanks, nbjoerg.  i hadn't thought of that.  and there
can't be anything more convenient, either
23:10 < crazy2be> The best debugger is just not to put any bugs there in the
first place :P
23:11 < skelterjohn> Man is evil.
23:12 < crazy2be> as in the unix command or the species?
23:13 < skelterjohn> As in you.
23:13 < ProNihilist> would be lowercase for the unix command
23:13 < crazy2be> ProNihilist: Not necessarily at the start of a sentence :P
23:15 < ProNihilist> since when did people on IRC follow all the proper
rules of grammar?
23:16 < crazy2be> Well, by that logic, it might have been lowercase and
referencing the species
23:16 < crazy2be> :P
23:16 < skelterjohn> Beware of confusing the existential and universal
quantifiers.
23:18 < crazy2be> Is there a go "cheat sheet" of sorts?  Just a basic
overview of the syntax because i keep forgetting
23:18 < skelterjohn> huh
23:18 < skelterjohn> dunno what that would look like
23:18 < skelterjohn> some example code?
23:18 < skelterjohn> i can point you to some example code
23:19 < crazy2be> like just a basic overview of the various control
structures, function syntax, declaration syntax,
23:19 < skelterjohn> i bet if you have to look them up one or two more times
you won't need a cheat sheet anymore
23:19 < crazy2be> Right now i just Ctrl+f through the language spec and that
works reasonably well
23:19 < skelterjohn> there you go
23:20 < crazy2be> well, i use other languages as well, and go is a little
different
23:20 < crazy2be> it's just the little things
23:20 < crazy2be> Like now, i can't remember how to do a for loop to loop
though a slice
23:20 < skelterjohn> you can use range
23:21 < skelterjohn> for index, value := range mySlice {
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23:21 < crazy2be> see a sheet with all that on it would be nice
23:21 < crazy2be> i was about to do an old for i = 0; i < blah; i++ loop
23:21 < skelterjohn> that would work great, too
23:21 < skelterjohn> i don't see the problem
23:22 < skelterjohn> i do sometimes forget which comes first in a slice
range, index or value.  i'm not even sure i have it right in the example i
provided
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23:22 < skelterjohn> but the compiler tells me if i get it wrong, most of
the time
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23:23 < wjlroe> you got it right
23:28 < exch> crazy2be: if it's just indices you need form a slice, you can
also do this: for i := range myslice { ...  }
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23:47 < crazy2be> Anyone know how to select a element from a slice using the
template library?
23:48 < crazy2be> I've tried MediaSgroup.MediaScontent.0.Url and
MediaSgroup.MediaScontent[0].Url
23:51 < scyth> crazy2be, how did you define MediaScontent?
23:53 < crazy2be> scyth: Well, printing it with %+v gives me:
{Title:{ST:Untitled Album Type:text} Summary:{ST:Just a test Type:text}
MediaSgroup:{MediaScontent:[{Url:http://lh4.ggpht.com/_tNx5ZR_U-hk/TJ56v2_3OJE/AAAAAAAAAA8/EHvm-hufOkA/UntitledAlbum.jpg
Type:image/jpeg Medium:image}] MediaScredit:[{ST:crazy 2be}]
MediaSdescription:{ST:Just a test Type:plain}
MediaSthumbnail:[{Url:http://lh4.ggpht.com/_tNx5ZR_U-hk/TJ56v2_3OJE/AAAAAAAAAA8/EHvm-hufOkA/s16
23:53 < scyth> crazy2be, I ment in code
23:54 < scyth> as you said, MediaSgroup.MediaScontent[0].Url
23:54 < scyth> that should work
23:54 < scyth> what's wrong with it?
23:55 < crazy2be> the template package doesn't like it, this is in a
template file itself
23:55 < crazy2be> says "Error rendering template: line 6: name not found:
MediaSgroup.MediaScontent[0].Url in type picasa.Photo"
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23:56 < scyth> how does picasa.Photo struct look like?
23:57 < scyth> MediaSgroup -- is that picasa.Photo ?
23:57 < crazy2be> http://pastie.org/1181789
23:58 < crazy2be> hmm
23:58 < crazy2be> Apparently i mixed tabs and spaces somehow
23:59 < crazy2be> now the indents are all messed up
23:59 < scyth> it's ok
23:59 < crazy2be> I'll run it through gofmt
23:59 -!- Davidian1024 [~Davidian1@cpe-98-27-192-193.neo.res.rr.com] has quit
[Ping timeout: 276 seconds]
23:59 < scyth> so did you do: MediaSgroup := new(picasa.Photo) ?
--- Log closed Sun Sep 26 00:00:07 2010