swatch_usage() {
    cat <<EOF >&2
NAME
       swatch - execute a program periodically with "watch". Supports aliases.

SYNOPSIS
       swatch [options] command

OPTIONS
       -n, --interval seconds (default: 1)
              Specify update interval.  The command will not allow quicker than 
              0.1 second interval.
EOF
}

if [ $# -eq 0 ]; then
    swatch_usage
    exit 1
fi

seconds=1
shell="$SHELL"

while [ $# -gt 0 ]; do
    case "$1" in
    -n)
        seconds="$2"
        args="${@:3}"
        shift 3
        ;;
    -h)
        swatch_usage
        exit 1
        ;;
    *)
        args="${@:1}"
        break
        ;;
    esac
done

# Get the base name of the shell executable
shell_basename=$(basename "$shell")

watch --color -n "$seconds" --exec "$shell" -ic "$args || true"