Remove dependency on github.com/writeas/nerds

id/random.go

@@ -2,11 +2,25 @@ package id
 
 import (
 	"fmt"
-	"github.com/writeas/nerds/store"
+	"crypto/rand"
 )
 
+// GenerateRandomString creates a random string of characters of the given
+// length from the given dictionary of possible characters.
+//
+// This example generates a hexadecimal string 6 characters long:
+//     GenerateRandomString("0123456789abcdef", 6)
+func GenerateRandomString(dictionary string, l int) string {
+	var bytes = make([]byte, l)
+	rand.Read(bytes)
+	for k, v := range bytes {
+		bytes[k] = dictionary[v%byte(len(dictionary))]
+	}
+	return string(bytes)
+}
+
 // GenSafeUniqueSlug generatees a reasonably unique random slug from the given
 // original slug. It's "safe" because it uses 0-9 b-z excluding vowels.
 func GenSafeUniqueSlug(slug string) string {
-	return fmt.Sprintf("%s-%s", slug, store.GenerateRandomString("0123456789bcdfghjklmnpqrstvwxyz", 4))
+	return fmt.Sprintf("%s-%s", slug, GenerateRandomString("0123456789bcdfghjklmnpqrstvwxyz", 4))
 }