Re: YAQAGV (Yet Another Question About Global Variables)

[Steven W. Orr]

On 8/23/2011 9:52 AM, Greg Wooledge wrote:
> On Tue, Aug 23, 2011 at 09:42:21AM -0400, Steven W. Orr wrote:
> > Since require is a function, any variables that
> > are declared in a required module which declare global variables using
> > typeset then become local variables to the require function. Then after the
> > modules are loaded, the variables that used to be global are gone.
>
> bash 4.2 adds "declare -g" to create global variables from within a function.

Hmm. I'm wondering if a trap might solve my problem. Bash4.2 doesn't help 
since we're on 4.0.35, but it would have been nice.

Something like...

# old code
require()
{
   ...
   source $fn   # fn is global
}

#new code
trap { source $fn; } SIGUSER1
require()
{
   # set the trap. Rats! I need to set it to a function.
   fn=something_I_want
   kill -USR1 $$
   # unset the trap handler
}

--
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steveo at syslang.net