func (a *API) UpdateWorksheet(cfg *Worksheet) (*Worksheet, error) {
	if cfg == nil {
		return nil, fmt.Errorf("Invalid worksheet config [nil]")
	}

	worksheetCID := string(cfg.CID)

	matched, err := regexp.MatchString(config.WorksheetCIDRegex, worksheetCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid worksheet CID [%s]", worksheetCID)
	}

	jsonCfg, err := json.Marshal(cfg)
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] update worksheet, sending JSON: %s", string(jsonCfg))
	}

	result, err := a.Put(worksheetCID, jsonCfg)
	if err != nil {
		return nil, err
	}

	worksheet := &Worksheet{}
	if err := json.Unmarshal(result, worksheet); err != nil {
		return nil, err
	}

	return worksheet, nil
}
func (a *API) UpdateWorksheet(cfg *Worksheet) (*Worksheet, error) {
	if cfg == nil {
		return nil, fmt.Errorf("Invalid worksheet config [nil]")
	}

	worksheetCID := string(cfg.CID)

	matched, err := regexp.MatchString(config.WorksheetCIDRegex, worksheetCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid worksheet CID [%s]", worksheetCID)
	}

	jsonCfg, err := json.Marshal(cfg)
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] update worksheet, sending JSON: %s", string(jsonCfg))
	}

	result, err := a.Put(worksheetCID, jsonCfg)
	if err != nil {
		return nil, err
	}

	worksheet := &Worksheet{}
	if err := json.Unmarshal(result, worksheet); err != nil {
		return nil, err
	}

	return worksheet, nil
}
// UpdateWorksheet updates passed worksheet.