bash extra argement(--) parsing with getopts

extra_args.sh

#!/bin/bash
#
# extra_args.sh -l args script_args -- -l extra args
#
# OUTPUT
# opt: l=args
# arg: %script_args%
# extra_args: %-l extra args%
#

while getopts 'l:' opt; do
    case $opt in
        l)
            echo "opt: $opt=$OPTARG";;
    esac
done

shift $((OPTIND-1))

while [[ $# -gt 0 ]]; do
    case $1 in
        --)
            shift;
            extra_args="$@"
            break;;
        *)
            args+="$1 ";;
    esac
    shift
done
args="${args/% /}"

echo "arg: %$args%"
echo "extra_args: %$extra_args%"