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37 lines
528 B
Go
37 lines
528 B
Go
package flagutil
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import "strconv"
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type tristate struct {
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opt *bool
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}
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// Tristate is a tri-state boolean flag type.
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// It can be set, but not unset.
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func Tristate(opt *bool) tristate {
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return tristate{opt}
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}
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func (t tristate) Type() string {
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return "tristate"
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}
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func (t tristate) String() string {
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if t.opt == nil {
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return "(unset)"
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}
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if *t.opt {
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return "true"
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}
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return "false"
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}
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func (t tristate) Set(s string) error {
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b, err := strconv.ParseBool(s)
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if err != nil {
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return err
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}
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t.opt = &b
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return nil
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}
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