_base64() {
    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="base64"
                ;;
            *)
                ;;
        esac
    done

    case "${cmd}" in
        base64)
            opts="-d -i -w -c -v -q -h --decode --ignore-space --wrap --color --verbose --quiet --help [FILE]..."
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                --wrap)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -w)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --color)
                    COMPREPLY=($(compgen -W "always ansi auto never" -- "${cur}"))
                    return 0
                    ;;
                -c)
                    COMPREPLY=($(compgen -W "always ansi auto never" -- "${cur}"))
                    return 0
                    ;;
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
    esac
}

complete -F _base64 -o bashdefault -o default base64