Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/format/format.go

@@ -0,0 +1,34 @@
+package format
+
+import (
+	"strconv"
+	"strings"
+)
+
+// ParseBool returns true for "1","true","yes" or false for "0","false","no" or defaultValue for any other value.
+func ParseBool(value string, defaultValue bool) (bool, bool) {
+	switch strings.ToLower(value) {
+	case "true", "1", "yes", "y":
+		return true, true
+	case "false", "0", "no", "n":
+		return false, true
+	default:
+		return defaultValue, false
+	}
+}
+
+// PrintBool returns "Yes" if value is true, otherwise returns "No".
+func PrintBool(value bool) string {
+	if value {
+		return "Yes"
+	}
+
+	return "No"
+}
+
+// IsNumber returns whether the specified string is number-like.
+func IsNumber(value string) bool {
+	_, err := strconv.ParseFloat(value, 64)
+
+	return err == nil
+}