_scummvm()
{
    local opt_name
    _init_completion || return

    # If it's in the middle of a long option, offer completions for that. I'm
    # adding these as an example until we figure which ones we want.

    if [[ ${cur} == --* ]]; then
       COMPREPLY=($(compgen -W "--debugflags= --debug-channels-only" -- "${cur}"))

       # If the match ends with "=" we want to continue typing from there
       # without any space at the end. This seems a bit peculiar to me, because
       # it will apply to multiple matches, but it's the way that was suggested
       # to me.

       if [[ ${COMPREPLY[@]} =~ "=" ]]; then
           compopt -o nospace
       fi
       
       return;
    fi

    # Handle command line options. Short options are converted into their long
    # form, and for long options we extract the option being used. At the point
    # where we can do tab completion on a long option, ${prev} will be "=" so
    # we have to look further back.

    case ${prev} in
        -e)
            opt_name=music-driver
            ;;
        =)
            opt_name=${COMP_WORDS[COMP_CWORD-2]}
            if [[ ${opt_name} != --* ]]; then
                return;
            fi
            opt_name="${opt_name#--}"
            ;;
    esac

    # If it's not an option, try matching a target from the scummvm.init file.

    if [[ -z ${opt_name} ]] && [[ ${cur} != -* ]]; then
        local scummvm_config

        # Try our old, now downright ancient, configuration path
        scummvm_config=${HOME}/.scummvmrc

        if [[ ! -f ${scummvm_config} ]]; then
            if [[ -n ${XDG_CONFIG_HOME} ]]; then
                scummvm_config=${XDG_CONFIG_HOME}/scummvm/scummvm.ini
            elif [[ -n ${HOME} ]]; then
                scummvm_config=${HOME}/.config/scummvm/scummvm.ini
            else
                return;
            fi
        fi

        if [[ -f ${scummvm_config} ]]; then
            games=$(sed -n '/^\[scummvm\]/!s/^\[\([^]]*\)\]/\1/p' ${scummvm_config})
            COMPREPLY=($(compgen -W "${games}" -- "${cur}"))
        fi

        return;
    fi

    # Completions for various option values. Not everything, just the ones I
    # thought were the most useful.

    local opts

    case ${opt_name} in
        music-driver)
            opts='fluidsynth mt32 eas null mac towns pc98 segacd adlib core riscos camd sndio seq coremidi stmidi dmedia alsa timidity windows'
            ;;
        render-mode)
            opts='hercGreen hercAmber cga cgaComp cgaBW ega vga amiga fmtowns pc98-256c pc98-16c pc98-8c 2gs atari macintosh macintoshbw cpc zx c64 vgaGrey win256c win16c'
            ;;
    esac

    if [[ -n ${opts} ]]; then
        COMPREPLY=($(compgen -W "${opts}" -- "${cur}"))
    fi
} &&
    complete -F _scummvm scummvm