Re: question on retrieving map(-A) value w/indirect name

[L A Walsh]

David Margerison wrote:
> processSrvState() {
>   local cur_up="$1[cur_up]"
>   local max_up="$1[max_up]"
>   if [[ "${!cur_up}" == "${!max_up}" ]] ; then
>     echo ok
>   fi
> }
>
> declare -A foo=([cur_up]=11 [max_up]=11)
>
> processSrvState foo
>
> # note that the array name must not conflict with any keys
>   
Thanks for the idea. I put it into a general sub for my use
(no error checking in this version):

hval() {                 # 1st=mapname, 2nd=key, 3rd=opt. outvar name
 dcl _hkey="$1[$2]" nl=""
 [[ ! $3 ]] && nl="\n"
 printf ${3:+-v $3} "%s$nl" ${!_hkey}
}


so for:

>  dcl A foo=([one]=1 [two]=2)
>  hval foo two
2
>  hval foo two outv
>  echo $outv
2

Thanks much!