moduleutils.php
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	<?php

	function phutil_get_library_root($library) {
	$bootloader = PhutilBootloader::getInstance();
	return $bootloader->getLibraryRoot($library);
	}

	function phutil_get_library_root_for_path($path) {
	foreach (Filesystem::walkToRoot($path) as $dir) {
	if (Filesystem::pathExists($dir.'/__phutil_library_init__.php')) {
	return $dir;
	}
	}
	return null;
	}

	function phutil_get_library_name_for_root($path) {
	$path = rtrim(Filesystem::resolvePath($path), '/');

	$bootloader = PhutilBootloader::getInstance();
	$libraries = $bootloader->getAllLibraries();
	foreach ($libraries as $library) {
	$root = $bootloader->getLibraryRoot($library);
	if (rtrim(Filesystem::resolvePath($root), '/') == $path) {
	return $library;
	}
	}

	return null;
	}

	function phutil_get_current_library_name() {
	$caller = head(debug_backtrace(false));

	$root = phutil_get_library_root_for_path($caller['file']);
	return phutil_get_library_name_for_root($root);
	}

	/**
	* Warns about use of deprecated behavior.
	*/
	function phutil_deprecated($what, $why) {
	PhutilErrorHandler::dispatchErrorMessage(
	PhutilErrorHandler::DEPRECATED,
	$what,
	array(
	'why' => $why,
	));
	}