Add option to specify a custom guard for the policy

src/Illuminate/Foundation/Console/PolicyMakeCommand.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Foundation\Console;
 
 use Illuminate\Console\GeneratorCommand;
+use Illuminate\Contracts\Auth\Access\Authorizable;
 use Illuminate\Support\Str;
 use Symfony\Component\Console\Input\InputOption;
 
@@ -67,6 +68,28 @@ protected function replaceUserNamespace($stub)
         );
     }
 
+    /**
+     * Get the model for the guard's user provider.
+     *
+     * @return string|null
+     */
+    protected function userProviderModel()
+    {
+        $config = $this->laravel['config'];
+
+        if ($this->option('any-guard')) {
+            return Authorizable::class;
+        }
+
+        $guard = $this->option('guard')
+                    ? $this->option('guard')
+                    : $config->get('auth.defaults.guard');
+
+        $provider = $config->get('auth.guards.'.$guard.'.provider');
+
+        return $config->get("auth.providers.{$provider}.model");
+    }
+
     /**
      * Replace the model for the given stub.
      *
@@ -160,6 +183,8 @@ protected function getOptions()
     {
         return [
             ['model', 'm', InputOption::VALUE_OPTIONAL, 'The model that the policy applies to'],
+            ['guard', 'g', InputOption::VALUE_OPTIONAL, 'The guard that the policy relies on'],
+            ['any-guard', null, InputOption::VALUE_NONE, 'Allow use with any authorizable model (overrides --guard)'],
         ];
     }
 }