cd a file fix

cd_a_file.sh

# Never cd a file and get the warning it's no a directory
# Important to unset the variable for ZSH prompt
function cd() {
    FORWARD_ARGS=()
    for ARG in "$@"
    do
        case "$ARG" in
        -L)     FORWARD_ARGS+=("-L")
                ;;
        -P)     FORWARD_ARGS+=("-P")
                ;;
        *)      if [ ! -d "$ARG" ]; then
                    FORWARD_ARGS+=$(dirname $ARG);
                else
                    FORWARD_ARGS+=$ARG
                fi
                ;;

        esac
    done
    unset ARG
    builtin cd $FORWARD_ARGS
    unset FORWARD_ARGS
}