✨ Add MultiGenerator

generators.go

@@ -1,6 +1,7 @@
 package nomino
 
 import (
+	"errors"
 	"time"
 
 	"github.com/google/uuid"
@@ -18,6 +19,32 @@ func WithGenerator(g Generator) Option {
 	}
 }
 
+// ErrMissingGenerators is returned by a multi-generator if no generators are supplied.
+var ErrMissingGenerators = errors.New("no generators supplied")
+
+func missingGen() (string, error) {
+	return "", ErrMissingGenerators
+}
+
+// MultiGeneratorInOrder allows the use of multiple generators. Each new invokation will use the next generator in turn.
+// If none are passed, the generator will always return ErrMissingGenerators.
+func MultiGeneratorInOrder(gens ...Generator) Generator {
+	if len(gens) == 0 {
+		return missingGen
+	}
+
+	if len(gens) == 1 {
+		return gens[0]
+	}
+
+	var idx int
+	return func() (string, error) {
+		st, err := gens[idx]()
+		idx = (idx + 1) % len(gens)
+		return st, err
+	}
+}
+
 func uuidGen() (string, error) {
 	u, err := uuid.NewRandom()
 	if err != nil {