Add ability to customize slug uniqueness resolution

resources/config/sluggable.php

@@ -79,6 +79,15 @@
 
     'unique' => true,
 
+    /**
+     * If the slug is not unique and you want to try to make it unique by replacing
+     * some other parts of the slug, you can set this to a closure which accepts
+     * the base slug, the separator, and a Collection of the other "similar" slugs.
+     * The closure should return the new unique slug to use, if the slug is still not
+     * unique, it will append a suffix.
+     */
+    'uniqueUsing' => null,
+
     /**
      * If you are enforcing unique slugs, the default is to add an
      * incremental value to the end of the base slug.  Alternatively, you

src/Services/SlugService.php

@@ -303,6 +303,20 @@ protected function makeSlugUnique(string $slug, array $config, string $attribute
             }
         }
 
+        // If uniqueUsing is set to a closure, use it to generate a new "unique" slug
+        if (isset($config['uniqueUsing']) && is_callable($config['uniqueUsing'])) {
+            $using = $config['uniqueUsing'];
+
+            // Generate mew slug using the closure
+            $slugUsing = $using($slug, $separator, $list);
+
+            // Remove uniqueUsing from the config to avoid infinite loop
+            unset($config['uniqueUsing']);
+
+            // Call makeSlugUnique again with the new slug to ensure it's unique
+            return $this->makeSlugUnique($slugUsing, $config, $attribute);
+        }
+
         $method = $config['uniqueSuffix'];
         $firstSuffix = $config['firstUniqueSuffix'];