[generate:controller] Validate class file is already exist (#4066)

Author: hjuarez20

src/Command/Generate/ControllerCommand.php

@@ -137,6 +137,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         $module = $this->validateModule($input->getOption('module'));
         $class = $this->validator->validateControllerName($input->getOption('class'));
+        $this->validator->validateControllerClassExists($class, $module);
         $routes = $input->getOption('routes');
         $test = $input->getOption('test');
         $services = $input->getOption('services');
@@ -176,8 +177,9 @@ protected function interact(InputInterface $input, OutputInterface $output)
             $class = $this->getIo()->ask(
                 $this->trans('commands.generate.controller.questions.class'),
                 'DefaultController',
-                function ($class) {
-                    return $this->validator->validateControllerName($class);
+                function ($class) use($module) {
+                    $class = $this->validator->validateControllerName($class);
+                    return $this->validator->validateControllerClassExists($class, $module);
                 }
             );
             $input->setOption('class', $class);

src/Utils/Validator.php

@@ -132,6 +132,23 @@ public function validateControllerName($class_name)
         }
     }
 
+    public function validateControllerClassExists($class_name, $module_name)
+    {
+        $class_exists = $this->extensionManager->getModule($module_name)->getControllerPath() . '/' . $class_name . '.php';
+
+        if (!$class_exists) {
+            return $class_name;
+        } else {
+            throw new \InvalidArgumentException(
+                sprintf(
+                    'Controller file with the name "%s.php" is already exist. Enter a different controller class name',
+                    $class_name,
+                    $module_name
+                )
+            );
+        }
+    }
+
     public function validateMachineName($machine_name)
     {
         if (preg_match(self::REGEX_MACHINE_NAME, $machine_name)) {