[twitter] Add custom handling for mentions

twitter/twitter.php

@@ -553,6 +553,9 @@ function twitter_post_hook(App $a, array &$b)
 		$connection->setTimeouts(10, 30);
 
 		$max_char = 280;
+
+		$b['body'] = twitter_update_mentions($b['body']);
+
 		$msgarr = ItemContent::getPlaintextPost($b, $max_char, true, 8);
 		$msg = $msgarr["text"];
 
@@ -1859,3 +1862,23 @@ function twitter_is_retweet(App $a, $uid, $body)
 
 	return !isset($result->errors);
 }
+
+function twitter_update_mentions($body)
+{
+	$URLSearchString = "^\[\]";
+	$return = preg_replace_callback(
+		"/@\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
+		function ($matches) {
+			if (strpos($matches[1], 'twitter.com')) {
+				$return = '@' . substr($matches[1], strrpos($matches[1], '/') + 1);
+			} else {
+				$return = $matches[2] . ' (' . $matches[1] . ')';
+			}
+
+			return $return;
+		},
+		$body
+	);
+
+	return $return;
+}