forked from toolshed/abra
64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package opts
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import (
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"errors"
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"time"
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)
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// PositiveDurationOpt is an option type for time.Duration that uses a pointer.
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// It behave similarly to DurationOpt but only allows positive duration values.
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type PositiveDurationOpt struct {
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DurationOpt
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}
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// Set a new value on the option. Setting a negative duration value will cause
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// an error to be returned.
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func (d *PositiveDurationOpt) Set(s string) error {
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err := d.DurationOpt.Set(s)
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if err != nil {
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return err
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}
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if *d.DurationOpt.value < 0 {
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return errors.New("duration cannot be negative")
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}
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return nil
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}
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// DurationOpt is an option type for time.Duration that uses a pointer. This
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// allows us to get nil values outside, instead of defaulting to 0
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type DurationOpt struct {
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value *time.Duration
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}
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// NewDurationOpt creates a DurationOpt with the specified duration
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func NewDurationOpt(value *time.Duration) *DurationOpt {
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return &DurationOpt{
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value: value,
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}
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}
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// Set a new value on the option
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func (d *DurationOpt) Set(s string) error {
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v, err := time.ParseDuration(s)
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d.value = &v
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return err
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}
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// Type returns the type of this option, which will be displayed in `--help` output
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func (*DurationOpt) Type() string {
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return "duration"
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}
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// String returns a string repr of this option
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func (d *DurationOpt) String() string {
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if d.value != nil {
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return d.value.String()
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}
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return ""
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}
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// Value returns the time.Duration
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func (d *DurationOpt) Value() *time.Duration {
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return d.value
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}
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