_sd() {
    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="sd"
                ;;
            *)
                ;;
        esac
    done

    case "${cmd}" in
        sd)
            opts="-p -F -n -f -h -V --preview --fixed-strings --max-replacements --flags --help --version <FIND> <REPLACE_WITH> [FILES]..."
            if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                return 0
            fi
            case "${prev}" in
                --max-replacements)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -n)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                --flags)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                -f)
                    COMPREPLY=($(compgen -f "${cur}"))
                    return 0
                    ;;
                *)
                    COMPREPLY=()
                    ;;
            esac
            COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
            return 0
            ;;
    esac
}

complete -F _sd -o nosort -o bashdefault -o default sd