if (!file_exists("{$old}.txt")) {
echo "Cannot move undefined configuration directive {$old}\n";
exit(1);
}
if ($old === $new) {
echo "Attempting to move to self, aborting\n";
exit(1);
}
if (file_exists("{$new}.txt")) {
echo "Cannot move to already defined directive {$new}\n";
exit(1);
}
$file = "{$old}.txt";
$builder = new HTMLPurifier_ConfigSchema_InterchangeBuilder();
$interchange = new HTMLPurifier_ConfigSchema_Interchange();
$builder->buildFile($interchange, $file);
$contents = file_get_contents($file);
if (strpos($contents, "\r\n") !== false) {
$nl = "\r\n";
} elseif (strpos($contents, "\r") !== false) {
$nl = "\r";
} else {
$nl = "\n";
}
// replace name with new name
$contents = str_replace($old, $new, $contents);
if ($interchange->directives[$old]->aliases) {
$pos_alias = strpos($contents, 'ALIASES:');
$pos_ins = strpos($contents, $nl, $pos_alias);
if ($pos_ins === false) {
$pos_ins = strlen($contents);
