Add safe slug generation func in package id

id/random.go

@@ -0,0 +1,12 @@
+package id
+
+import (
+	"fmt"
+	"github.com/writeas/nerds/store"
+)
+
+// 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))
+}

id/random_test.go

@@ -0,0 +1,19 @@
+package id
+
+import "testing"
+
+func TestGenSafeUniqueSlug(t *testing.T) {
+	slug := "slug"
+	r := map[string]bool{}
+
+	for i := 0; i < 1000; i++ {
+		s := GenSafeUniqueSlug(slug)
+		if s == slug {
+			t.Errorf("Got same slug as inputted!")
+		}
+		if _, ok := r[s]; ok {
+			t.Errorf("#%d: slug %s was already generated in testing.", i, s)
+		}
+		r[s] = true
+	}
+}