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opts/duration.go
64 строки
1 KB
Vincent Demeester
Move duration opts into an opts package
16 май 2017, 18:49
Не верифицирован
16 май 2017, 18:49
b5182ba
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package opts import ( "time" "github.com/pkg/errors" ) // PositiveDurationOpt is an option type for time.Duration that uses a pointer. // It behave similarly to DurationOpt but only allows positive duration values. type PositiveDurationOpt struct { DurationOpt } // Set a new value on the option. Setting a negative duration value will cause // an error to be returned. func (d *PositiveDurationOpt) Set(s string) error { err := d.DurationOpt.Set(s) if err != nil { return err } if *d.DurationOpt.value < 0 { return errors.Errorf("duration cannot be negative") } return nil } // DurationOpt is an option type for time.Duration that uses a pointer. This // allows us to get nil values outside, instead of defaulting to 0 type DurationOpt struct { value *time.Duration } // NewDurationOpt creates a DurationOpt with the specified duration func NewDurationOpt(value *time.Duration) *DurationOpt { return &DurationOpt{ value: value, } } // Set a new value on the option func (d *DurationOpt) Set(s string) error { v, err := time.ParseDuration(s) d.value = &v return err } // Type returns the type of this option, which will be displayed in `--help` output func (d *DurationOpt) Type() string { return "duration" } // String returns a string repr of this option func (d *DurationOpt) String() string { if d.value != nil { return d.value.String() } return "" } // Value returns the time.Duration func (d *DurationOpt) Value() *time.Duration { return d.value }