I am wondering what exactly ruby_script() is doing ?
Looking in README.EXT
void ruby_script(char *name)
Specifies the name of the script ($0).
I have tried both with&without ruby_script(), but I
don’t feel any difference 
ruby_init();
ruby_init_loadpath();
ruby_script(“embed”);
Why am I asking this question? Because I see ruby_script()
used everywhere… Im confused.
What is purpose with ruby_script() ?
–
Simon Strandgaard
Hi,
At Sun, 13 Apr 2003 12:33:05 +0900, Simon Strandgaard wrote:
I am wondering what exactly ruby_script() is doing ?
Changing $0 and source file name in stack trace.
–
Nobu Nakada
Are you telling me that I should be able to see the
souce filename during backtrace ?
Can you explain further ?
Thanks
Simon Strandgaard
On Sun, 13 Apr 2003 15:05:11 +0900, nobu.nokad wrote:
At Sun, 13 Apr 2003 12:33:05 +0900, > Simon Strandgaard wrote:
I am wondering what exactly ruby_script() is doing ?
Changing $0 and source file name in stack trace.
Can you explain further ?
pigeon% cat b.rb
#!/usr/bin/ruby
raise "out"
pigeon%
pigeon% b.rb
./b.rb:2: out (RuntimeError)
pigeon%
ruby display "./b.rb", at the beginning of the line, because it has called
ruby_script("./b.rb")
Guy Decoux
Can you explain further ?
pigeon% cat b.rb
#!/usr/bin/ruby
raise “out”
pigeon%pigeon% b.rb
./b.rb:2: out (RuntimeError)
pigeon%ruby display “./b.rb”, at the beginning of the line, because it has called
ruby_script(“./b.rb”)
Weird… I don’t see any “embed” in my backtraces?
./a.out -e ‘puts “hello”; raise “out”’
hello
-e:1: out (RuntimeError)
less main.cpp
#include <ruby.h>
int main(int argc, char *argv) {
ruby_init();
ruby_init_loadpath();
ruby_script(“embed”); // seems not to have any effect ?
ruby_options(argc, argv);
ruby_run();
}
When you are doing embedding are you then supposed to
call ruby_script() ?
On Sun, 13 Apr 2003 22:19:25 +0900, ts wrote:
–
Simon Strandgaard
./a.out -e 'puts "hello"; raise "out"'
You call -e it display -e
pigeon% cat a.c
#include <ruby.h>
static VALUE
tt()
{
rb_raise(rb_eStandardError, "error");
return Qnil;
}
int main(int argc, char *argv)
{
int res;
ruby_init();
ruby_init_loadpath();
ruby_script("embed"); // seems not to have any effect ?
rb_protect(tt, 0, &res);
if (res) {
VALUE err = rb_inspect(ruby_errinfo);
rb_backtrace();
fprintf(stdout, "ERROR %s\n", StringValuePtr(err));
}
return 0;
}
pigeon%
pigeon% a.out
from embed
ERROR #<StandardError: error>
pigeon%
Guy Decoux
Hi,
./a.out -e ‘puts “hello”; raise “out”’
hello
-e:1: out (RuntimeError)
Because the source is given by “-e”.
ruby_script("embed"); // seems not to have any effect ? ruby_options(argc, argv);
ruby_options() calls ruby_script().
At Sun, 13 Apr 2003 21:53:49 +0900, Simon Strandgaard wrote:
–
Nobu Nakada
Hi,
./a.out -e ‘puts “hello”; raise “out”’
hello
-e:1: out (RuntimeError)Because the source is given by “-e”.
ruby_script("embed"); // seems not to have any effect ? ruby_options(argc, argv);ruby_options() calls ruby_script().
OK… Now I’ve swapped them. But it makes no difference.
./a.out -e ‘puts “hello”; raise “out”’
hello
-e:1: out (RuntimeError)
less main.cpp
#include <ruby.h>
int main(int argc, char *argv) {
ruby_init();
ruby_init_loadpath();
ruby_options(argc, argv);
ruby_script(“embed”); // what is going on?
ruby_run();
}
On Sun, 13 Apr 2003 23:13:13 +0900, nobu.nokad wrote:
At Sun, 13 Apr 2003 21:53:49 +0900, > Simon Strandgaard wrote:
–
Simon Strandgaard
[snip good code example]
If you are doing a rb_require() then I see no “embed” message ?
Should’nt it say “embed” in the backtrace ??
./a.out
hello
from ./test.rb:2
ERROR #<RuntimeError: out>
cat main.cpp
#include <ruby.h>
#include
using namespace std;
VALUE myfunc(VALUE) {
rb_require(“test.rb”);
rb_raise(rb_eStandardError, “error”);
return Qnil;
}
int main(int argc, char *argv) {
ruby_init();
ruby_init_loadpath();
ruby_script(“embed”);
int error;
rb_protect(myfunc, 0, &error);
if(error) {
VALUE err = rb_inspect(ruby_errinfo);
rb_backtrace();
cout << "ERROR " << StringValuePtr(err) << endl;
}
return 0;
}
cat test.rb
puts “hello”
raise “out”
On Sun, 13 Apr 2003 23:12:39 +0900, ts wrote:
–
Simon Strandgaard
./a.out -e 'puts "hello"; raise "out"'
When ruby compile a script (or a string) it store in each node the name of
the file and the line number. These are these values that it display when it
print an error.
Because you have used -e the string 'puts "hello"; raise "out"' was
compiled with the name '-e' and when it display the error it use this
name.
For example
pigeon% cat b.rb
#!/usr/bin/ruby
raise "out"
pigeon%
pigeon% cat c.rb
#!/usr/bin/ruby
require 'b.rb'
pigeon%
pigeon% c.rb
./b.rb:2: out (RuntimeError)
from ./c.rb:2:in `require'
from ./c.rb:2
pigeon%
See the first line with './b.rb' and not './c.rb'
Guy Decoux
I think I got that… But what Im not understanding is
when you are doing rb_require() that “embed” is not written out?
Is’nt “embed” supposed to be outputted in the backtrace?
On Sun, 13 Apr 2003 23:46:40 +0900, ts wrote:
./a.out -e ‘puts “hello”; raise “out”’
When ruby compile a script (or a string) it store in each node the name of
the file and the line number. These are these values that it display when it
print an error.Because you have used -e the string ‘puts “hello”; raise “out”’ was
compiled with the name ‘-e’ and when it display the error it use this
name.
–
Simon Strandgaard
Is'nt "embed" supposed to be outputted in the backtrace?
The backtrace are outputted for each frame created, when you write
pigeon% cat a.c
#include <ruby.h>
static VALUE
tt()
{
rb_require("b.rb");
return Qnil;
}
int main(int argc, char *argv)
{
int res;
ruby_init();
ruby_init_loadpath();
ruby_script("embed"); // seems not to have any effect ?
rb_protect(tt, 0, &res);
if (res) {
VALUE err = rb_inspect(ruby_errinfo);
fprintf(stdout, "ERROR %s\n", StringValuePtr(err));
rb_backtrace();
}
return 0;
}
pigeon%
ruby create a frame *only* for rb_require() (rb_laod(), none of the
commands ruby_init(), ruby_init_loadpath(), rb_protect() create a frame.
Guy Decoux
Is’nt “embed” supposed to be outputted in the backtrace?
The backtrace are outputted for each frame created, when you write
[snip]
ruby create a frame only for rb_require() (rb_laod(), none of the
commands ruby_init(), ruby_init_loadpath(), rb_protect() create a frame.
I see… only rb_require(). BTW what is a frame?
Im writing a tutorial on embedding. The section on “initialization”.
What should I write: use ruby_script() it does something ?
http://metaeditor.sourceforge.net/embed/
I tried rb_load() … but I don’t see “embed” in the backtrace, why ?
./a.out
hello
from ./test.rb:2
ERROR #<RuntimeError: out>
cat main.cpp
#include <ruby.h>
#include
using namespace std;
VALUE myfunc(VALUE) {
//rb_require(“test.rb”, 0);
rb_load(rb_str_new2(“test.rb”), Qtrue); // no “embed” backtrace?
return Qnil;
}
int main(int argc, char *argv) {
ruby_init();
ruby_init_loadpath();
ruby_script(“embed”);
int error;
rb_protect(myfunc, 0, &error);
if(error) {
VALUE err = rb_inspect(ruby_errinfo);
rb_backtrace();
cout << "ERROR " << StringValuePtr(err) << endl;
}
return 0;
}
cat test.rb
puts “hello”
raise “out”
On Mon, 14 Apr 2003 00:25:49 +0900, ts wrote:
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I must take care : SpamAssassin think that you are a spammer :-)))
I see… only rb_require(). BTW what is a frame?
Well, it’s the internal of ruby : not important
I tried rb_load() … but I don’t see “embed” in the backtrace, why ?
rb_load() is what ruby call when you make a rb_require() on a script file
(not a dynamic library).
This is rb_load() which create the frame : because ruby has a frame it
display the backtrace only for these frames. Your program has never
created a frame (except for rb_load()) this is why ruby don’t display its
name
Guy Decoux
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so you can recognise or block similar unwanted mail in future.
See Apache SpamAssassin: Welcome for more details.I must take care : SpamAssassin think that you are a spammer :-)))
Exactly… I’ve converted to the dark side and im very dangerous!!
I see… only rb_require(). BTW what is a frame?
[snip ruby-internals]
Thanks (ts, nobu) for your efforts.
Im not that much confused any longer 
Still I don’t know what to write in that tutorial about initialization ???
Suggestions is welcome
On Mon, 14 Apr 2003 01:45:58 +0900, ts wrote:
–
Simon Strandgaard