1#@!#!123s

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Filename : arp
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# arp(8) completion                                 -*- shell-script -*-

_arp()
{
    local cur prev words cword
    _init_completion || return

    case $prev in
        --device | -!(-*)i)
            _available_interfaces -a
            return
            ;;
        --protocol | -!(-*)[Ap])
            # TODO protocol/address family
            return
            ;;
        --file | -!(-*)f)
            _filedir
            return
            ;;
        --hw-type | -!(-*)[Ht])
            # TODO: parse from --help output?
            COMPREPLY=($(compgen -W 'ash ether ax25 netrom rose arcnet \
                dlci fddi hippi irda x25 eui64' -- "$cur"))
            return
            ;;
    esac

    if [[ $cur == -* ]]; then
        COMPREPLY=($(compgen -W '$(_parse_help "$1")' -- "$cur"))
        return
    fi

    local args
    _count_args "" "@(--device|--protocol|--file|--hw-type|-!(-*)[iApfHt])"
    case $args in
        1)
            local ips=$("$1" -an | command sed -ne \
                's/.*(\([0-9]\{1,3\}\(\.[0-9]\{1,3\}\)\{3\}\)).*/\1/p')
            COMPREPLY=($(compgen -W '$ips' -- "$cur"))
            ;;
        2)
            # TODO if -d mode: "pub"; if not -f mode: hw_addr
            # TODO hw_addr is a configured interface with --use-device/-*D*
            ;;
        3)
            # TODO netmask|pub|temp if -s mode
            ;;
        4)
            # TODO netmask value if previous was "netmask"
            ;;
        5)
            # TODO "pub" if 3rd was "netmask"
            ;;
    esac
} &&
    complete -F _arp arp

# ex: filetype=sh