Convert pruning time span from RC6 to number of hours

composer.json

@@ -4,7 +4,7 @@
 	"description": "mChat",
 	"homepage": "https://github.com/kasimi/mChat",
 	"version": "2.0.0-RC7",
-	"time": "2016-10-03",
+	"time": "2016-10-16",
 	"keywords": ["phpbb", "extension", "mchat"],
 	"license": "GPL-2.0",
 	"authors": [

migrations/mchat_2_0_0_rc7.php

@@ -26,8 +26,42 @@ public function update_data()
 		return array(
 			array('config.update', array('mchat_version', '2.0.0-RC7')),
 
-			array('config.update', array('mchat_prune', 0)),
 			array('config.add', array('mchat_prune_mode', 0)),
+			array('custom', array(array($this, 'fix_pruning_time_span'))),
 		);
 	}
+
+	/**
+	 * In 2.0.0-RC6 it was possible to specify a time span like '45 minutes' or '4 days' to
+	 * keep the messages from that time span when pruning messages. Since 2.0.0-RC7 it is
+	 * only possible to specify the number of hours, days or weeks. If such a time span is
+	 * defined in the mchat_prune_num config value it is converted here to the number of
+	 * hours, rounded up to the next full hour.
+	 */
+	public function fix_pruning_time_span()
+	{
+		$prune_num = $this->config['mchat_prune_num'];
+
+		if (false === filter_var($prune_num, FILTER_VALIDATE_INT))
+		{
+			$time_span = strtotime($prune_num, 0);
+
+			if ($time_span !== false)
+			{
+				// A time span is specified. Convert it to number of hours.
+				$hours = ceil($time_span / 60 / 60);
+
+				$sql = 'UPDATE ' . CONFIG_TABLE . '
+					SET config_value = ' . (int) $hours . "
+					WHERE config_name = 'mchat_prune_num'";
+				$this->sql_query($sql);
+
+				// Set to 'hours' mode
+				$sql = 'UPDATE ' . CONFIG_TABLE . "
+					SET config_value = 1
+					WHERE config_name = 'mchat_prune_mode'";
+				$this->sql_query($sql);
+			}
+		}
+	}
 }