Exemplo n.º 1
0
// NewFlagKeyValue implements the flag.Value interface for
// capturing ucfg.Config settings from command line arguments.
// Configuration options follow the argument name and must be in the form of
// "key=value". Using 'D' as command line flag for example, options on command line
// must be given as:
//
// -D key1=value -D key=value
//
// Note: the space between command line option and key is required by the flag
// package to parse command line flags correctly.
//
// Note: it's valid to use a key multiple times. If keys are used multiple
// times, values get overwritten. The last known value for some key will be stored
// in the generated configuration.
//
// The type of value must be any of bool, uint, int, float, or string. Any kind
// of array or object syntax is not supported.
//
// If autoBool is enabled (default if Config or ConfigVar is used), keys without
// value are converted to bool variable with value being true.
func NewFlagKeyValue(cfg *ucfg.Config, autoBool bool, opts ...ucfg.Option) *FlagValue {
	return newFlagValue(cfg, opts, func(arg string) (*ucfg.Config, error, error) {
		var key string
		var val interface{}
		var err error

		args := strings.SplitN(arg, "=", 2)
		if len(args) < 2 {
			if !autoBool || len(args) == 0 {
				err := fmt.Errorf("argument '%v' is empty ", arg)
				return nil, err, err
			}

			key = arg
			val = true
		} else {
			key = args[0]
			val, err = parse.ParseValue(args[1])
			if err != nil {
				return nil, err, err
			}
		}

		tmp := map[string]interface{}{key: val}
		cfg, err := ucfg.NewFrom(tmp, opts...)
		return cfg, err, err
	})
}
Exemplo n.º 2
0
func (s *cfgSplice) parseValue(opts *options) (value, error) {
	str, err := s.splice.eval(s.ctx.getParent(), opts)
	if err != nil {
		return nil, err
	}

	ifc, err := parse.ParseValue(str)
	if err != nil {
		return nil, err
	}

	if ifc == nil {
		if strings.TrimSpace(str) == "" {
			return newString(s.ctx, s.meta(), str), nil
		}
		return &cfgNil{cfgPrimitive{ctx: s.ctx, metadata: s.meta()}}, nil
	}

	switch v := ifc.(type) {
	case bool:
		return newBool(s.ctx, s.meta(), v), nil
	case int64:
		return newInt(s.ctx, s.meta(), v), nil
	case uint64:
		return newUint(s.ctx, s.meta(), v), nil
	case float64:
		return newFloat(s.ctx, s.meta(), v), nil
	case string:
		return newString(s.ctx, s.meta(), v), nil
	}

	sub, err := normalize(opts, ifc)
	if err != nil {
		return nil, err
	}
	sub.ctx = s.ctx
	sub.metadata = s.metadata
	return cfgSub{sub}, nil
}