_truncate() {
    local i cur prev opts cmd
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    cmd=""
    opts=""

    for i in ${COMP_WORDS[@]}
    do
        case "${cmd},${i}" in
            ",$1")
                cmd="truncate"
                ;;
            *)
                ;;
        esac
    done

    case "${cmd}" in
        truncate)
            opts="-o -c -r -s -h -V --io-blocks --no-create --reference --size --help --version <FILE>..."
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                --reference)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -r)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --size)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -s)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
    esac
}

complete -F _truncate -o nosort -o bashdefault -o default truncate
