Added support for command renaming

Support limited to one Redis instance
Fix for issue moodle-an-hochschulen#8

README.md

@@ -41,6 +41,16 @@ Site administration -> Server -> Redis management.
 
 The Redis management GUI should be self-explanatory for experienced PHP administrators.
 
+As the Moodle Cache Plugin for REDIS doesn't support command renaming, you need an additional entry in config.php.
+It has to be in the following form:
+```
+$CFG->cache_redis = array(
+    'cache_instance' => 'NAME OF INSTANCE',
+    'INFO' => 'RENAMED INFO COMMAND',
+    'AUTH' => 'RENAMED AUTH COMMAND',
+);
+```
+You can choose one of 'INFO' and 'AUTH' or both.
 
 Capabilities
 ------------

lib/redis-stats/config.php

@@ -61,7 +61,16 @@
     }
 
     // Remember the Redis store information.
-    $servers[] = [$store['name'], $store['configuration']['server'], 6379, $store['configuration']['password']];
+    $server_info = explode(":", $store['configuration']['server']);
+    $servers[] = [$store['name'], $server_info[0], $server_info[1] ?? 6379, $store['configuration']['password']];
+}
+if (isset($CFG->cache_redis) && !is_null($CFG->cache_redis) && !empty($CFG->cache_redis)) {
+    if (isset($CFG->cache_redis['INFO']) && !is_null($CFG->cache_redis['INFO']) && !empty($CFG->cache_redis['INFO'])) {
+        $command[$CFG->cache_redis['cache_instance']]['INFO'] = $CFG->cache_redis['INFO'];
+    }
+    if (isset($CFG->cache_redis['AUTH']) && !is_null($CFG->cache_redis['AUTH']) && !empty($CFG->cache_redis['AUTH'])) {
+        $command[$CFG->cache_redis['cache_instance']]['AUTH'] = $CFG->cache_redis['AUTH'];
+    }
 }
 
 // Forth: If there isn't any Redis store configured, we should stop here.