set-program-arguments from scheme

set-program-arguments from scheme

[Kevin Ryde]

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How about making scm_set_program_arguments() available at the scheme
level too?  As say

	(set-program-arguments lst)

(without the "first" arg business of the C level).

The C func is good for when you munch some options at the C level in
an scm_boot_guile, having it at the scheme level would be for the same
thing if do it in scheme instead.



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--- feature.c.~1.62.2.1.~	2006-02-14 08:58:57.000000000 +1100
+++ feature.c	2007-01-13 17:41:19.000000000 +1100
@@ -76,6 +76,21 @@
   scm_fluid_set_x (progargs_fluid, args);
 }
 
+SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0, 
+	    (SCM lst),
+	    "Set the command line arguments to be returned by\n"
+	    "@code{program-arguments} (and @code{command-line}).  @var{lst}\n"
+	    "should be a list of strings, the first of which is the program\n"
+	    "name (either a script name, or just @code{\"guile\"}).\n"
+	    "\n"
+	    "Program arguments are held in a fluid and therefore have a\n"
+	    "separate value in each Guile thread.")
+#define FUNC_NAME s_scm_program_arguments
+{
+  return scm_fluid_set_x (progargs_fluid, lst);
+}
+#undef FUNC_NAME
+
 
 \f
 

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Re: set-program-arguments from scheme

[Neil Jerram]

Kevin Ryde <user42@zip.com.au> writes:

> How about making scm_set_program_arguments() available at the scheme
> level too?  As say
>
> 	(set-program-arguments lst)
>
> (without the "first" arg business of the C level).
>
> The C func is good for when you munch some options at the C level in
> an scm_boot_guile, having it at the scheme level would be for the same
> thing if do it in scheme instead.

That sounds good to me.

(I wondered about (set-program-arguments . lst) instead of
(set-program-arguments lst), but I suspect cases where you already
have a list in hand will be more common.)

> +	    "Program arguments are held in a fluid and therefore have a\n"
> +	    "separate value in each Guile thread.")

That's surprising; why is that?  (I appreciate this isn't part of your
change though.)

Regards,
     Neil



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Re: set-program-arguments from scheme

[Kevin Ryde]

Neil Jerram <neil@ossau.uklinux.net> writes:
>
> (I wondered about (set-program-arguments . lst) instead of
> (set-program-arguments lst), but I suspect cases where you already
> have a list in hand will be more common.)

Yes, especially if you got it from a (program-arguments) call.

>> +	    "Program arguments are held in a fluid and therefore have a\n"
>> +	    "separate value in each Guile thread.")
>
> That's surprising; why is that?

Tell me and we'll both know :).  scm_boot_guile can be called in each
thread with a different argc+argv, I suppose.  I guess it lets you run
each thread like it's a separate program, though that sounds like an
unusual way to work.


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Re: set-program-arguments from scheme

[Kevin Ryde]

Incidentally, I called the scheme func "scm_set_program_arguments_scm",
because plain "scm_set_program_arguments" is taken by the C interface.


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Re: set-program-arguments from scheme

[Neil Jerram]

Kevin Ryde <user42@zip.com.au> writes:

>>> +	    "Program arguments are held in a fluid and therefore have a\n"
>>> +	    "separate value in each Guile thread.")
>>
>> That's surprising; why is that?
>
> Tell me and we'll both know :).

Fair enough :-).  I just thought you might have come across the reason.

>  scm_boot_guile can be called in each
> thread with a different argc+argv, I suppose.  I guess it lets you run
> each thread like it's a separate program, though that sounds like an
> unusual way to work.

Yes, it does sound unusual.

Regards,
     Neil



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