Re: [Help-bash] indirection for arrays

[Steven W. Orr]

On 5/7/2012 9:16 AM, Greg Wooledge wrote:
> On Mon, May 07, 2012 at 09:12:52AM -0400, Steven W. Orr wrote:
> > and I can also say stuff like:
> >
> > typeset -a flist
> > glob_array flist "$srpms/$dist/elx-lpfc-*_$dist.src.rpm"
>
> How is that better than (or even different from):
>
> flist=("$srpms/$dist"/elx-lpfc-*_"$dist".src.rpm)

Mine is better because it sets and restores nullglob. My flist will be a zero 
length list if the glob does not match any files.

Here it is if anyone wants it...

# Take pairs of glob patterns and array names and set the array names to the
# resulting glob patterns. If the glob doesn't match then the array is
# left empty.
glob_array()
{
    typeset pattern
    typeset -i ii
    typeset -a aval
    typeset -i nullglob_status=0
    typeset -r nullglob_reset=su        # Set Unset
    typeset -i nn=0

    (( $# & 1 )) && die 'ERROR: glob_array takes an even number of args'
    shopt -p nullglob > /dev/null
    nullglob_status=$?
    shopt -s nullglob

    while (( $# ))
    do
        typeset $1
        pattern="$2"
        aval=( $pattern )
        address@hidden
        # This should never fail as long as $nn matches passing all of aval.
        # Check anyways for extra credit.
        upvars -a$nn $1 "address@hidden" || die 'ERROR:upvars failed.'
        shift 2
    done
    shopt -${nullglob_reset:$nullglob_status:1} nullglob
}



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