_aircrack-ng()
{
    local current previous commands help_options

    previous=${COMP_WORDS[COMP_CWORD-1]}
    current="${COMP_WORDS[COMP_CWORD]}"

    commands="-w -l -C -q -p -b -e -a"
    wpa_commands="-E -J -S -r"
    wep_commands="$commands -c -t -h -d -m -n -i -f -k -x0 -x1 -x2 -y -K -s -M -D -P -1"
    all_commands="$wep_commands $wpa_commands"
    wpa_commands="$commands $wpa_commands"

    [[ $AIROSCRIPT_AP_ENC =~ (.*)WPA(.*) ]] && {
        COMPREPLY=( $(compgen -W "${wpa_commands}" -- ${current}) ) ;
    } || {
        [[ $AIROSCRIPT_AP_ENC =~ (.*)WEP(.*) ]] && {
            COMPREPLY=( $(compgen -W "${wep_commands}" -- ${current}) ) ;
        } || {
            COMPREPLY=( $(compgen -W "${all_commands}" -- ${current}) ) ;
        }
    }

    case "${previous}" in
       -e) COMPREPLY=(\$AIROSCRIPT_AP_NAME);;
       -b) COMPREPLY=(\$AIROSCRIPT_AP_MAC);;
    esac
}

complete -o default -o bashdefault -F _aircrack-ng aircrack-ng