[gentoo-dev] Re: Network configuration and bash

[David Leverton]

Roy Marples wrote:
> On Fri, 09 Feb 2007 01:03:04 -0800
> Donnie Berkholz <dberkholz@g.o> wrote:
>
>> How about this?
>>
>> replace="
>> 	'4d 1280 768 24'
>> 	'5c 1400 1050 16'
>> "
>>
>
> Actually, that may work better than my delimited with ; approach.
> We could then do
>
> eval set -- "${replace}"
> for x in "$@" ; do
>  ....
> done

Would something like the following be acceptable?  If the user uses bash 
they can use an array, otherwise (or if they prefer) they can do the 
"'...' '...'" thing, transparently to the code that uses the variable. 
Could do with more testing of edge cases, but it seems to work well for 
me - in bash as is, and in dash and busybox with the "foo" section 
commented out.

get_array() {
     local var="${1}"

     if [ -n "${BASH}" ]; then
         declaration="$( declare -p "${var}" )"
         case "${declaration}" in
             "declare -a"*)
                 echo "set -- \"\${${var}[@]}\""
                 return
         esac
     fi

     echo "eval set -- \"\${${var}}\""
}

foo=( 1 2 3 )
eval $(get_array foo)
for x in "$@"; do
     echo $x
done

bar="1 2 3"
eval $(get_array bar)
for x in "$@"; do
     echo $x
done


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