add option -c

README.md

@@ -26,4 +26,4 @@ hook_url = "https://mattermost.example.com/hooks/1234567890abcdefghijklm"
 message_template = "« %1$s » %2$s #foo #bar"
 ```
 
-Then run `php index.php`.
+Then run `php index.php`. You can specify the path of the configuration file using `php index.php -c /path/to/config.ini`;

index.php

@@ -2,13 +2,16 @@
 
 chdir(__DIR__);
 
-$config = parse_ini_file('config.ini', true);
+$options = getopt("c:");
+
+$config = parse_ini_file($options['c'] ?? 'config.ini', true);
 
 $feedUrl = $config['feed']['url'];
 $hookUrl = $config['mattermost']['hook_url'];
 $cacheFile = $config['cache']['file'];
 $template = $config['mattermost']['message_template'];
 
+
 if (file_exists($cacheFile)) {
     $cache = json_decode(file_get_contents($cacheFile), true);