tweak command output.

Author: taylorotwell

src/Illuminate/Foundation/Console/KeyGenerateCommand.php

@@ -41,11 +41,18 @@ public function fire()
 	{
 		$contents = $this->files->get($path = $this->laravel['path'].'/config/app.php');
 
-		$contents = str_replace('YourSecretKey!!!', $key = $this->getRandomKey(), $contents);
+		$contents = str_replace('YourSecretKey!!!', $key = $this->getRandomKey(), $contents, $count);
 
-		$this->files->put($path, $contents);
+		if ($count == 0)
+		{
+			$this->comment('Application key has already been set.');
+		}
+		else
+		{
+			$this->files->put($path, $contents);
 
-		$this->info("Application key [$key] set successfully.");
+			$this->info("Application key [$key] set successfully.");
+		}
 	}
 
 	/**