_gtk4_builder_tool()
{
    local cur prev cmd opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    if [[ "$COMP_CWORD" == "1" ]] ; then
      local commands="validate simplify enumerate preview render screenshot"
      COMPREPLY=( $(compgen -W "${commands}" -- ${cur}) )
      return 0
    fi

    cmd="${COMP_WORDS[1]}"

    case "${prev}" in
        --id|--css|--)
            return 0
            ;;
    esac

    case "${cmd}" in
        validate)
            opts="--help --deprecations"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

        simplify)
            opts="--help --replace --3to4"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

        enumerate)
            opts="--help --callbacks"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

        preview)
            opts="--help --id --css"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

        render|screenshot)
            opts="--help --id --css --node --force"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;
    esac
}

complete -o default -F _gtk4_builder_tool gtk4-builder-tool