Migrate Sirupsen to sirupsen.

vendor/github.com/docker/cli/opts/duration.go

@@ -0,0 +1,64 @@
+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
+}