Added convince function to encode IDs to hash strings.

util.go

@@ -4,3 +4,19 @@ package hide
 func FromString(id string) (ID, error) {
 	return hash.Decode([]byte(id))
 }
+
+// Returns a new hash from given ID by using the hasher or an error if it couldn't encode the ID.
+// If ID is 0, "null" will be returned.
+func ToString(id ID) (string, error) {
+	if id == 0 {
+		return "null", nil
+	}
+
+	hash, err := hash.Encode(id)
+
+	if err != nil {
+		return "", err
+	}
+
+	return string(hash), nil
+}

util_test.go

@@ -19,3 +19,15 @@ func TestFromStringEmpty(t *testing.T) {
 		t.Fatalf("Must return 0 on empty string, but was: %v %v", err, id)
 	}
 }
+
+func TestToString(t *testing.T) {
+	if hash, err := ToString(123); err != nil || hash != "beJarVNaQM" {
+		t.Fatalf("Must return hash from ID, but was: %v %v", err, hash)
+	}
+}
+
+func TestToStringNull(t *testing.T) {
+	if hash, err := ToString(0); err != nil || hash != "null" {
+		t.Fatalf("Must return 0 from null ID, but was: %v %v", err, hash)
+	}
+}