bash completion for apt command

apt

# Debian apt(8) completion                                 -*- shell-script -*-

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

    local dashoptions='-h --help -v --version -c --config-file -o --option -t -a'

    local special i
    for (( i=0; i < ${#words[@]}-1; i++ )); do
        if [[ ${words[i]} == @(list|search|show|update|install|remove|upgrade|full-upgrade|edit-sources) ]]; then
            special=${words[i]}
        fi
    done

    if [[ -n $special ]]; then
        case $special in
            install|show)
                COMPREPLY=( $( apt-cache --no-generate pkgnames "$cur" \
                    2> /dev/null ) )
                return 0
                ;;
            remove)
                if [[ -f /etc/debian_version ]]; then
                    # Debian system
                    COMPREPLY=( $( \
                        _xfunc dpkg _comp_dpkg_installed_packages $cur ) )
                else
                    # assume RPM based
                    _xfunc rpm _rpm_installed_packages
                fi
                return 0
                ;;
        esac
    fi

    case $prev in
        # don't complete anything if these options are found
        search|update|upgrade|full-upgrade)
            return 0
            ;;
        list)
            COMPREPLY=( $( compgen -W '--installed --upgradable --all-versions' -- "$cur") )
            return 0
            ;;
        -c)
            _filedir
            return 0
            ;;
        -t)
            COMPREPLY=( $( apt-cache policy | \
                command grep "release.o=Debian,a=$cur" | \
                sed -e "s/.*a=\(\w*\).*/\1/" | uniq 2> /dev/null ) )
            return 0
            ;;
    esac

    if [[ "$cur" == -* ]]; then
        COMPREPLY=( $( compgen -W "$dashoptions" -- "$cur" ) )
    else
        COMPREPLY=( $( compgen -W 'list search show update install remove
            upgrade full-upgrade edit-sources' -- "$cur" ) )
    fi

    return 0
} &&
complete -F _apt apt

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