if ... elif ... громоздко

#!/bin/bash

usage="$(basename $0) [-v] -m <text>"

my_variable=""
verbose="false"
while [ $# -gt 0 ]; do
    case "$1" in
        -h|-\?)
            echo "$usage"
            exit 0
        ;;
        -m)
            if [ -z "${2:-}" ]; then
               echo "Error: $1 expects a parameter" 1>&2
               exit 1
            fi
            my_variable="$2"
            shift
        ;;
        -v)
            verbose="true"
        ;;
        *)
            echo "Error: unexpected argument: $1" 1>&2
            exit 1
        ;;
    esac
    shift
done

echo "${my_variable}"
echo "${verbose}"