_gtk4_image_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="compare convert info relabel show play"
      COMPREPLY=( $(compgen -W "${commands}" -- ${cur}) )
      return 0
    fi

    cmd="${COMP_WORDS[1]}"

    case "${prev}" in
        --output|--)
            return 0
            ;;

        --format)
            local formats=$(gtk4-image-tool convert --format=help foo bar 2>&1 | tail --lines=+3)
            COMPREPLY=( $(compgen -W "${formats}" -- ${cur}) )
            return 0
            ;;

        --color-state)
            local colorstates=$(gtk4-image-tool convert --color-state=help foo bar 2>&1 | tail --lines=+3)
            COMPREPLY=( $(compgen -W "${colorstates}" -- ${cur}) )
            return 0
            ;;

        --cicp)
            return 0
            ;;
    esac

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

        convert)
            opts="--help --format --color-state --cicp"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

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

        relabel)
            opts="--help --color-state --cicp"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;

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

        play)
            opts="--help --undecorated --size"
            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
            return 0
            ;;
    esac
}

complete -o default -F _gtk4_image_tool gtk4-image-tool