add value vithh error

input/variable/duration.go

@@ -0,0 +1,31 @@
+package variable
+
+import (
+	"fmt"
+	"time"
+
+	"gitoa.ru/go-4devs/console/input/flag"
+	"gitoa.ru/go-4devs/console/input/value"
+)
+
+func Duration(name, description string, opts ...Option) Variable {
+	return String(name, description, append(opts, WithParse(CreateDuration, AppendDuration), Value(flag.Duration))...)
+}
+
+func CreateDuration(in string) (value.Value, error) {
+	out, err := time.ParseDuration(in)
+	if err != nil {
+		return nil, fmt.Errorf("create duration:%w", err)
+	}
+
+	return value.NewDuration(out), nil
+}
+
+func AppendDuration(old value.Value, in string) (value.Value, error) {
+	out, err := time.ParseDuration(in)
+	if err != nil {
+		return nil, fmt.Errorf("append duration:%w", err)
+	}
+
+	return value.NewDurations(append(old.Durations(), out)), nil
+}