Add stringOptions() method to the Options trait (resolve #12)

src/Options.php

@@ -5,10 +5,11 @@ declare(strict_types=1);
 namespace ArchTech\Enums;
 
 use BackedEnum;
+use Closure;
 
 trait Options
 {
-    /** Get an associative array of [case name => case value]. */
+    /** Get an associative array of [case name => case value] or an indexed array [case name, case name] in the case of pure enums. */
     public static function options(): array
     {
         $cases = static::cases();
@@ -17,4 +18,33 @@ trait Options
             ? array_column($cases, 'value', 'name')
             : array_column($cases, 'name');
     }
+
+    /**
+     * Generate a string format of the enum options using the provided callback and glue.
+     * @param Closure(string $name, mixed $value): string $callback
+     */
+    public static function stringOptions(Closure $callback = null, string $glue = '\n'): string
+    {
+        $firstCase = static::cases()[0] ?? null;
+
+        if ($firstCase === null) {
+            return '';
+        } elseif ($firstCase instanceof BackedEnum) {
+            // [name => value]
+            $options = static::options();
+        } else {
+            // [name, name]
+            $options = static::options();
+
+            // [name => name, name => name]
+            $options = array_combine($options, $options);
+        }
+
+        // Default callback
+        $callback ??= fn ($name, $value) => "<option value=\"{$value}\">" . ucfirst(strtolower($name)) . '</option>';
+
+        $options = array_map($callback, array_keys($options), array_values($options));
+
+        return implode($glue, $options);
+    }
 }